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Metso Microcel™ flotation columns - Metso Outotec

Metso Microcel™ high recovery flotation columns are the standard in flotation technology. They are known for producing high concentrate grade, increase product recovery and improve plant profitability.Metso Microcel™ high recovery flotation columns are the standard in flotation technology. They are known for producing high concentrate grade, increase product recovery and improve plant profitability.

Metso RCS™ flotation machines - Metso Outotec

Metso RCS™ flotation machines have made several advances in flotation design and technology. Maximize bubble-particle contact within the mechanism and the flotation tank leads to enhanced performance. Effective air dispersion and distribution throughout the cell volume helps in smooth froth surface and removal. Efficient air and level controlMetso RCS™ flotation machines have made several advances in flotation design and technology. Maximize bubble-particle contact within the mechanism and the flotation tank leads to enhanced performance. Effective air dispersion and distribution throughout the cell volume helps in smooth froth surface and removal. Efficient air and level control

Flotation Machine - an overview ScienceDirect Topics

The most rapidly growing class of flotation machine is the column machine, which is, as its name implies, a vessel having a large height-to-diameter ratio (from 5 to 20) in contrast to mechanical cells. The mechanism behind this machine to is provide a countercurrent flow of air bubbles and slurry with a long contact time and plenty of wash water.The most rapidly growing class of flotation machine is the column machine, which is, as its name implies, a vessel having a large height-to-diameter ratio (from 5 to 20) in contrast to mechanical cells. The mechanism behind this machine to is provide a countercurrent flow of air bubbles and slurry with a long contact time and plenty of wash water.

High recovery flotation machine for mineral separation ...

High recovery flotation machine for mineral separation, US $ 1650 - 45000 / Set, New, Flotation Separator, 90% Recovery Rate.Source from Jiangxi Gandong Mining Equipment Machinery Manufacturer on Alibaba.High recovery flotation machine for mineral separation, US $ 1650 - 45000 / Set, New, Flotation Separator, 90% Recovery Rate.Source from Jiangxi Gandong Mining Equipment Machinery Manufacturer on Alibaba.

High Precision, Advanced recovery flotation machine ...

Alibaba features a broad selection of optimal quality recovery flotation machine that work with high precision and make your work easier. Grab these recovery flotation machine at low prices.Alibaba features a broad selection of optimal quality recovery flotation machine that work with high precision and make your work easier. Grab these recovery flotation machine at low prices.

WEMCO 1+1 Flotation Machines - 911 Metallurgist

Flotation cells designed for more profitable minerals concentration 2 Exclusive Design, Proven Superiority WEMCO ® 1+1 Flotation Machines feature a unique design that is demonstrably superior to other mechanical flotation systems. In direct comparisons by major mining companies, WEMCO 1+1 cells have repeatedly delivered higher recoveryFlotation cells designed for more profitable minerals concentration 2 Exclusive Design, Proven Superiority WEMCO ® 1+1 Flotation Machines feature a unique design that is demonstrably superior to other mechanical flotation systems. In direct comparisons by major mining companies, WEMCO 1+1 cells have repeatedly delivered higher recovery

high efficient flotation cell machine

Forced-air flotation cell . Specifically designed to maximise fine particle recovery, the Dorr-Oliver flotation cell is the most energy efficient, technically advanced, forced-air flotation machine on the market. Its air dispersion capabilities exceed all competitive forced air designs – an important consideration for fine particle recovery ...Forced-air flotation cell . Specifically designed to maximise fine particle recovery, the Dorr-Oliver flotation cell is the most energy efficient, technically advanced, forced-air flotation machine on the market. Its air dispersion capabilities exceed all competitive forced air designs – an important consideration for fine particle recovery ...

Flotation Machines - 911 Metallurgist

22/06/2015  The aeration is generally controlled by a single valve in the header of each machine, but for selective flotation the machine is sometimes divided by transverse partitions into sections 4 ft. long, the header over each section being provided with a separate air-valve. The depth of the froth is regulated by means of the adjustable gate of the tailing weir. If difficulty is likely to be experienced in making a clean tailing with the normal amount of aeration, 22/06/2015  The aeration is generally controlled by a single valve in the header of each machine, but for selective flotation the machine is sometimes divided by transverse partitions into sections 4 ft. long, the header over each section being provided with a separate air-valve. The depth of the froth is regulated by means of the adjustable gate of the tailing weir. If difficulty is likely to be experienced in making a clean tailing with the normal amount of aeration,

JJF Type Flotation Machine - Rhyther Mining

JJF flotation machine(floatation cell) is a new type of flotation equipment advanced in China. It can be widely used in the selection of non-ferrous metals, ferrous metals and non-metallic minerals. It is suitable for rough selection and sweeping of large and medium-sized flotation plants.JJF flotation machine(floatation cell) is a new type of flotation equipment advanced in China. It can be widely used in the selection of non-ferrous metals, ferrous metals and non-metallic minerals. It is suitable for rough selection and sweeping of large and medium-sized flotation plants.

Metso RCS™ flotation machines - Metso Outotec

Metso RCS™ flotation machines have made several advances in flotation design and technology. Maximize bubble-particle contact within the mechanism and the flotation tank leads to enhanced performance. Effective air dispersion and distribution throughout the cell volume helps in smooth froth surface and removal. Efficient air Metso RCS™ flotation machines have made several advances in flotation design and technology. Maximize bubble-particle contact within the mechanism and the flotation tank leads to enhanced performance. Effective air dispersion and distribution throughout the cell volume helps in smooth froth surface and removal. Efficient air

high efficient flotation cell machine

Forced-air flotation cell . Specifically designed to maximise fine particle recovery, the Dorr-Oliver flotation cell is the most energy efficient, technically advanced, forced-air flotation machine on the market. Its air dispersion capabilities exceed all competitive forced air designs – an important consideration for fine particle recovery ...Forced-air flotation cell . Specifically designed to maximise fine particle recovery, the Dorr-Oliver flotation cell is the most energy efficient, technically advanced, forced-air flotation machine on the market. Its air dispersion capabilities exceed all competitive forced air designs – an important consideration for fine particle recovery ...

Productive froth flotation technology FLSmidth

Over the years, we have delivered more than 57,000 flotation machines, varying in size from 1 m3 up to 660 m3, and including both self-aspirated mechanisms and forced-air mechanisms. What does this legacy mean for your operation? In a nutshell: high recovery, which translates into greater efficiency and increased profits.Over the years, we have delivered more than 57,000 flotation machines, varying in size from 1 m3 up to 660 m3, and including both self-aspirated mechanisms and forced-air mechanisms. What does this legacy mean for your operation? In a nutshell: high recovery, which translates into greater efficiency and increased profits.

China High Recovery Rate Agitair Flotation Machine for ...

High Recovery Rate Agitair Flotation Machine for Graphite Ore Processing in Madagascar, Tanzania, South Africa picture from Henan Yuhui Mining Machinery Co., Ltd. view photo of Flotation Machine, Copper Mining Plant, Gold Ore Flotation Machine.Contact China Suppliers for More Products and Price.High Recovery Rate Agitair Flotation Machine for Graphite Ore Processing in Madagascar, Tanzania, South Africa picture from Henan Yuhui Mining Machinery Co., Ltd. view photo of Flotation Machine, Copper Mining Plant, Gold Ore Flotation Machine.Contact China Suppliers for More Products and Price.

Flotation technology - FLSmidth Dorr-Oliver Eimco - PDF ...

Increased Fine Particle Recovery The Dorr-Oliver Flotation Mechanism is the most energy efficient, technically advanced, forced air flotation machine on the market. It has been specifically designed to maximize fine particle recovery. The Dorr-Oliver streamlined, high efficiency rotor is a very powerfulIncreased Fine Particle Recovery The Dorr-Oliver Flotation Mechanism is the most energy efficient, technically advanced, forced air flotation machine on the market. It has been specifically designed to maximize fine particle recovery. The Dorr-Oliver streamlined, high efficiency rotor is a very powerful

A flotation control system to optimise performance using ...

01/01/2017  Air recovery is known to pass through a peak as cell aeration is increased, and it has been shown that operating flotation cells at the air rate that yields this peak air recovery (PAR) results in improved separation performance, whether through high recovery, higher grade, or both.01/01/2017  Air recovery is known to pass through a peak as cell aeration is increased, and it has been shown that operating flotation cells at the air rate that yields this peak air recovery (PAR) results in improved separation performance, whether through high recovery, higher grade, or both.

High Precision, Advanced high quality flotation machine ...

High Quality Flotation Machine Equipment High High Quality Long Duration Time Drilling Rig Accessories Vibration Flotation Machine Equipment. US $15000-$20000/ Set. 1.0 Sets (Min. Order) 1 YRS Beijing Vibroflotation Engineering Machinery Limited Company. Contact Supplier.High Quality Flotation Machine Equipment High High Quality Long Duration Time Drilling Rig Accessories Vibration Flotation Machine Equipment. US $15000-$20000/ Set. 1.0 Sets (Min. Order) 1 YRS Beijing Vibroflotation Engineering Machinery Limited Company. Contact Supplier.

Dissolved Air Flotation (DAF) Water Treatment For Plastic ...

01/10/2020  A complete dissolved air floatation (DAF) waste water treatment system for recycling water used in plastic washing plants as well as in any of the following: Paper waste water treatment and fiber recovery. Printing and dyeing wastewater treatment. Electroplating and other heavy metal ions containing wastewater treatment. Oily wastewater treatment.01/10/2020  A complete dissolved air floatation (DAF) waste water treatment system for recycling water used in plastic washing plants as well as in any of the following: Paper waste water treatment and fiber recovery. Printing and dyeing wastewater treatment. Electroplating and other heavy metal ions containing wastewater treatment. Oily wastewater treatment.

gold silver cooper flotation machine crusher for 5 to 3mm

High Quality Gold Silver Coopergold Mining. High quality flotation cell mining for copper gold silver.High recovery flotation machine, dissolved air flotation for copper, gold, silver, lead high recovery ratio copper silver gold mining machinery fiber glass shaking table good quality cheap superfine gold recovery machine chat online.Read more. MoreHigh Quality Gold Silver Coopergold Mining. High quality flotation cell mining for copper gold silver.High recovery flotation machine, dissolved air flotation for copper, gold, silver, lead high recovery ratio copper silver gold mining machinery fiber glass shaking table good quality cheap superfine gold recovery machine chat online.Read more. More

Flotation - 911 Metallurgist

15/12/2016  The graphs show platinum group metals as PGMs and gangue recovery with flotation time at six different air rates measured as cubic meters of air per minute per cubic meter of pulp. PGM concentrate mass recovery increase at different rates resulting in the system operating at successively different recovery grade curves. You can see that highest concentrate grade is generated at the lowest air ...15/12/2016  The graphs show platinum group metals as PGMs and gangue recovery with flotation time at six different air rates measured as cubic meters of air per minute per cubic meter of pulp. PGM concentrate mass recovery increase at different rates resulting in the system operating at successively different recovery grade curves. You can see that highest concentrate grade is generated at the lowest air ...

Metso RCS™ flotation machines - Metso Outotec

Metso RCS™ flotation machines have made several advances in flotation design and technology. Maximize bubble-particle contact within the mechanism and the flotation tank leads to enhanced performance. Effective air dispersion and distribution throughout the cell volume helps in smooth froth surface and removal. Efficient air Metso RCS™ flotation machines have made several advances in flotation design and technology. Maximize bubble-particle contact within the mechanism and the flotation tank leads to enhanced performance. Effective air dispersion and distribution throughout the cell volume helps in smooth froth surface and removal. Efficient air

Induced-air flotation cell FLSmidth

Superior air dispersion and high slurry re-circulation ensure adequate residence time for optimum recovery and concentrate grade. Choose induced-air flotation for economy. The simple design induces aeration naturally, reducing both capital and operating costs. Efficient air dispersion cuts down on frother consumption. Reduced mechanism erosion lowers your maintenance costs. Whether ...Superior air dispersion and high slurry re-circulation ensure adequate residence time for optimum recovery and concentrate grade. Choose induced-air flotation for economy. The simple design induces aeration naturally, reducing both capital and operating costs. Efficient air dispersion cuts down on frother consumption. Reduced mechanism erosion lowers your maintenance costs. Whether ...

A flotation control system to optimise performance using ...

01/01/2017  Air recovery is known to pass through a peak as cell aeration is increased, and it has been shown that operating flotation cells at the air rate that yields this peak air recovery (PAR) results in improved separation performance, whether through high recovery, higher grade, or both.01/01/2017  Air recovery is known to pass through a peak as cell aeration is increased, and it has been shown that operating flotation cells at the air rate that yields this peak air recovery (PAR) results in improved separation performance, whether through high recovery, higher grade, or both.

High Precision, Advanced high quality flotation machine ...

High Quality Flotation Machine Equipment High High Quality Long Duration Time Drilling Rig Accessories Vibration Flotation Machine Equipment. US $15000-$20000/ Set. 1.0 Sets (Min. Order) 1 YRS Beijing Vibroflotation Engineering Machinery Limited Company. Contact Supplier.High Quality Flotation Machine Equipment High High Quality Long Duration Time Drilling Rig Accessories Vibration Flotation Machine Equipment. US $15000-$20000/ Set. 1.0 Sets (Min. Order) 1 YRS Beijing Vibroflotation Engineering Machinery Limited Company. Contact Supplier.

FLSmidth Dorr-Oliver Eimco Flotation Technology

Our flotation machines surpass the performance of competing flotation machines in both of these important areas. Superior Metallurgy FLSmidth Dorr-Oliver Eimco flotation machine’s metallurgical superiority has been proven in side-by-side comparative tests conducted by major mining companies. Results show that our flotation machines operate on superior grade recovery curves with respect to ...Our flotation machines surpass the performance of competing flotation machines in both of these important areas. Superior Metallurgy FLSmidth Dorr-Oliver Eimco flotation machine’s metallurgical superiority has been proven in side-by-side comparative tests conducted by major mining companies. Results show that our flotation machines operate on superior grade recovery curves with respect to ...

high recovery rate copper flotation machine

High Recovery Rate Flotation Machine For Processing Mineral Flotation machine for coal preparation is the kind of air inflation flotation cell which can be fitted with any of the three types of mechanisms giving you flexibility in using one consistent tank that can . High Recovery Rate Xjk-1.1 Tungsten Ore/ Wolfram Ore High Recovery Rate Xjk-1.1 Tungsten Ore/ Wolfram Ore Flotation Machine Find ...High Recovery Rate Flotation Machine For Processing Mineral Flotation machine for coal preparation is the kind of air inflation flotation cell which can be fitted with any of the three types of mechanisms giving you flexibility in using one consistent tank that can . High Recovery Rate Xjk-1.1 Tungsten Ore/ Wolfram Ore High Recovery Rate Xjk-1.1 Tungsten Ore/ Wolfram Ore Flotation Machine Find ...

Circular Flotation Machine - Yantai Jinpeng Mining ...

Forced-air flotation machine with Jg up to 2.5cm/s . Rotor with inclined blades and enhanced pumping capacity . Stator with special geometry for improved large-scale flow pattern and high turbulence dissipation rate . Rotor-stator with high wear-resistance . Low energy consumption . Uniform air dispersion . Excellent ergonomics for easy operation and maintenance . Same-level arrangement or ...Forced-air flotation machine with Jg up to 2.5cm/s . Rotor with inclined blades and enhanced pumping capacity . Stator with special geometry for improved large-scale flow pattern and high turbulence dissipation rate . Rotor-stator with high wear-resistance . Low energy consumption . Uniform air dispersion . Excellent ergonomics for easy operation and maintenance . Same-level arrangement or ...

Flotation Developments Best Practice - International

04/11/2013  “Historically, flotation cell design criteria and scale-up have emphasised pulp zone recovery. Scale-up of Dorr-Oliver or Xcell forced air flotation machines and Wemco self-aspirated flotation equipment cells was accomplished by maintaining geometric and hydrodynamic similarity within the product line. The hydrodynamic functions are a set of ...04/11/2013  “Historically, flotation cell design criteria and scale-up have emphasised pulp zone recovery. Scale-up of Dorr-Oliver or Xcell forced air flotation machines and Wemco self-aspirated flotation equipment cells was accomplished by maintaining geometric and hydrodynamic similarity within the product line. The hydrodynamic functions are a set of ...

Products - OMC

High performance physical-chemical separation process for water clarification, sludge thickening and raw material recovery. Sedifloat. High performance physical-chemical separation process. Flotation and settling flotation processes simultaneously applied. Tigerfloat. High performance and modern conception clarifier. Application of advanced ...High performance physical-chemical separation process for water clarification, sludge thickening and raw material recovery. Sedifloat. High performance physical-chemical separation process. Flotation and settling flotation processes simultaneously applied. Tigerfloat. High performance and modern conception clarifier. Application of advanced ...

Jiangxi Hengcheng Mining Equipment Co., Ltd. - Trommel ...

Flotation Equipment Magnetic machine. Auxiliary Equipment. Mineral processing line ... Knelson Centrifugal Concentrator Machine High Recovery Centrifugal Mineral Separator. High Recovery. Centrifugal Concentrator. $3,500.00 - $29,600.00 / Set. 1.0 Sets (Min. Order) 4 decks shaking table gold shaker table with larger capacity. For Gold. $1,600.00 - $7,800.00 / Set. 1.0 Sets (Min. Order) Stone ...Flotation Equipment Magnetic machine. Auxiliary Equipment. Mineral processing line ... Knelson Centrifugal Concentrator Machine High Recovery Centrifugal Mineral Separator. High Recovery. Centrifugal Concentrator. $3,500.00 - $29,600.00 / Set. 1.0 Sets (Min. Order) 4 decks shaking table gold shaker table with larger capacity. For Gold. $1,600.00 - $7,800.00 / Set. 1.0 Sets (Min. Order) Stone ...

Induced-air flotation cell FLSmidth

Superior air dispersion and high slurry re-circulation ensure adequate residence time for optimum recovery and concentrate grade. Choose induced-air flotation for economy. The simple design induces aeration naturally, reducing both capital and operating costs. Efficient air dispersion cuts down on frother consumption. Reduced mechanism erosion lowers your maintenance costs. Whether ...Superior air dispersion and high slurry re-circulation ensure adequate residence time for optimum recovery and concentrate grade. Choose induced-air flotation for economy. The simple design induces aeration naturally, reducing both capital and operating costs. Efficient air dispersion cuts down on frother consumption. Reduced mechanism erosion lowers your maintenance costs. Whether ...

High Precision, Advanced high quality flotation machine ...

High Quality Flotation Machine Equipment High High Quality Long Duration Time Drilling Rig Accessories Vibration Flotation Machine Equipment. US $15000-$20000/ Set. 1.0 Sets (Min. Order) 1 YRS Beijing Vibroflotation Engineering Machinery Limited Company. Contact Supplier.High Quality Flotation Machine Equipment High High Quality Long Duration Time Drilling Rig Accessories Vibration Flotation Machine Equipment. US $15000-$20000/ Set. 1.0 Sets (Min. Order) 1 YRS Beijing Vibroflotation Engineering Machinery Limited Company. Contact Supplier.

FLSmidth Dorr-Oliver Eimco Flotation Technology

Our flotation machines surpass the performance of competing flotation machines in both of these important areas. Superior Metallurgy FLSmidth Dorr-Oliver Eimco flotation machine’s metallurgical superiority has been proven in side-by-side comparative tests conducted by major mining companies. Results show that our flotation machines operate on superior grade recovery curves with respect to ...Our flotation machines surpass the performance of competing flotation machines in both of these important areas. Superior Metallurgy FLSmidth Dorr-Oliver Eimco flotation machine’s metallurgical superiority has been proven in side-by-side comparative tests conducted by major mining companies. Results show that our flotation machines operate on superior grade recovery curves with respect to ...

Circular Flotation Machine - Yantai Jinpeng Mining ...

Forced-air flotation machine with Jg up to 2.5cm/s . Rotor with inclined blades and enhanced pumping capacity . Stator with special geometry for improved large-scale flow pattern and high turbulence dissipation rate . Rotor-stator with high wear-resistance . Low energy consumption . Uniform air dispersion . Excellent ergonomics for easy operation and maintenance . Same-level arrangement or ...Forced-air flotation machine with Jg up to 2.5cm/s . Rotor with inclined blades and enhanced pumping capacity . Stator with special geometry for improved large-scale flow pattern and high turbulence dissipation rate . Rotor-stator with high wear-resistance . Low energy consumption . Uniform air dispersion . Excellent ergonomics for easy operation and maintenance . Same-level arrangement or ...

high recovery rate copper flotation machine

High Recovery Rate Flotation Machine For Processing Mineral Flotation machine for coal preparation is the kind of air inflation flotation cell which can be fitted with any of the three types of mechanisms giving you flexibility in using one consistent tank that can . High Recovery Rate Xjk-1.1 Tungsten Ore/ Wolfram Ore High Recovery Rate Xjk-1.1 Tungsten Ore/ Wolfram Ore Flotation Machine Find ...High Recovery Rate Flotation Machine For Processing Mineral Flotation machine for coal preparation is the kind of air inflation flotation cell which can be fitted with any of the three types of mechanisms giving you flexibility in using one consistent tank that can . High Recovery Rate Xjk-1.1 Tungsten Ore/ Wolfram Ore High Recovery Rate Xjk-1.1 Tungsten Ore/ Wolfram Ore Flotation Machine Find ...

Mineral Flotation - International Mining

01/11/2011  Higher power flotation machines (high rpm, standard rotor size) at the end of the row to increase recovery of fine particles. 3. Lower power flotation machines (low rpm, larger rotor) at the end of the row (mixed with higher energy cells) to increase recovery of coarse particles. This concept was successfully implemented at the Mineral Park concentrator in Arizona and will be expanded at ...01/11/2011  Higher power flotation machines (high rpm, standard rotor size) at the end of the row to increase recovery of fine particles. 3. Lower power flotation machines (low rpm, larger rotor) at the end of the row (mixed with higher energy cells) to increase recovery of coarse particles. This concept was successfully implemented at the Mineral Park concentrator in Arizona and will be expanded at ...

Flotation Separator-Jiangxi Changyi Mining Machinery Co.,

Dissolved air flotation machine can be used for the processing of many ores. After rough selection, sweep selection, fine selection and flotation, useful ore is recovered. Factory Direct Low Price Flotation Machine For Gold Recovery Manufacturer Indonesia Flotation Machine technology can be used for a vast range of applications like Mineral separation, Industrial minerals for separating ...Dissolved air flotation machine can be used for the processing of many ores. After rough selection, sweep selection, fine selection and flotation, useful ore is recovered. Factory Direct Low Price Flotation Machine For Gold Recovery Manufacturer Indonesia Flotation Machine technology can be used for a vast range of applications like Mineral separation, Industrial minerals for separating ...

Products - OMC

High performance physical-chemical separation process for water clarification, sludge thickening and raw material recovery. Sedifloat. High performance physical-chemical separation process. Flotation and settling flotation processes simultaneously applied. Tigerfloat. High performance and modern conception clarifier. Application of advanced ...High performance physical-chemical separation process for water clarification, sludge thickening and raw material recovery. Sedifloat. High performance physical-chemical separation process. Flotation and settling flotation processes simultaneously applied. Tigerfloat. High performance and modern conception clarifier. Application of advanced ...

Jiangxi Hengcheng Mining Equipment Co., Ltd. - Trommel ...

Flotation Equipment Magnetic machine. Auxiliary Equipment. Mineral processing line ... Knelson Centrifugal Concentrator Machine High Recovery Centrifugal Mineral Separator. High Recovery. Centrifugal Concentrator. $3,500.00 - $29,600.00 / Set. 1.0 Sets (Min. Order) 4 decks shaking table gold shaker table with larger capacity. For Gold. $1,600.00 - $7,800.00 / Set. 1.0 Sets (Min. Order) Stone ...Flotation Equipment Magnetic machine. Auxiliary Equipment. Mineral processing line ... Knelson Centrifugal Concentrator Machine High Recovery Centrifugal Mineral Separator. High Recovery. Centrifugal Concentrator. $3,500.00 - $29,600.00 / Set. 1.0 Sets (Min. Order) 4 decks shaking table gold shaker table with larger capacity. For Gold. $1,600.00 - $7,800.00 / Set. 1.0 Sets (Min. Order) Stone ...

Dissolved-Air Flotation of Metal Ions - auth

Downloaded By: [HEAL- Link Consortium] At: 09:40 18 June 2007 DISSOLVED-AIR FLOTATION OF METAL IONS 1747 stoichiometric amount required. This seems to contradict previous results, where a 30% excess of sodium sulfide was found to be adequate (If), but a possible explanation can be traced to froth flotation (14) where sodium sulfide constitutes a depressing agent for sulfide ores.Downloaded By: [HEAL- Link Consortium] At: 09:40 18 June 2007 DISSOLVED-AIR FLOTATION OF METAL IONS 1747 stoichiometric amount required. This seems to contradict previous results, where a 30% excess of sodium sulfide was found to be adequate (If), but a possible explanation can be traced to froth flotation (14) where sodium sulfide constitutes a depressing agent for sulfide ores.