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Energy Saving Ball Mill - xinhaiepc

35 行  Cylindrical energy saving grid ball mill design consist of feeding part, discharging part, rotary part, transmission part (reducer, small gear, motors, electrical control) and other major parts. Hollow shaft is steel castings, and the liner is detachable. Rotary 35 行  Cylindrical energy saving grid ball mill design consist of feeding part, discharging part, rotary part, transmission part (reducer, small gear, motors, electrical control) and other major parts. Hollow shaft is steel castings, and the liner is detachable. Rotary

High efficiency Supply-energy saving Ball Mill/ball mill ...

Advantage Description. High Efficiency Supply-energy Saving Ball Mill/ball Mill For Sale Uk , Find Complete Details about High Efficiency Supply-energy Saving Ball Mill/ball Mill For Sale Uk,Planetary Ball Mill,Chocolate Ball Mill,Ball Mill For Sale Uk from Mine Mill Supplier or Manufacturer-Shicheng Oasis Mineral Equipment Manufacturing Co., Ltd.Advantage Description. High Efficiency Supply-energy Saving Ball Mill/ball Mill For Sale Uk , Find Complete Details about High Efficiency Supply-energy Saving Ball Mill/ball Mill For Sale Uk,Planetary Ball Mill,Chocolate Ball Mill,Ball Mill For Sale Uk from Mine Mill Supplier or Manufacturer-Shicheng Oasis Mineral Equipment Manufacturing Co., Ltd.

Global Energy Saving Ball Mill Market 2020 by ...

Energy Saving Ball Mill competitive landscape provides details by vendors, including company overview, company total revenue, market potential, global presence, Energy Saving Ball Mill sales and revenue generated, market share, price, production sites and facilities, SWOT analysis, product launch. For the period 2015-2020, this study provides ...Energy Saving Ball Mill competitive landscape provides details by vendors, including company overview, company total revenue, market potential, global presence, Energy Saving Ball Mill sales and revenue generated, market share, price, production sites and facilities, SWOT analysis, product launch. For the period 2015-2020, this study provides ...

Energy Efficient Ball Mill - 86371.cn

2011-12-6  The energy efficient ball mill is widely used in powder-making production line including cement, silicate, new-type building material, refractory material, fertilizer, ore dressing of ferrous metal and non-ferrous metal, glass ceramics, etc, it can grind 2011-12-6  The energy efficient ball mill is widely used in powder-making production line including cement, silicate, new-type building material, refractory material, fertilizer, ore dressing of ferrous metal and non-ferrous metal, glass ceramics, etc, it can grind

energy saving industrial ball mill for mineral classifying

Energy-saving ball mill ballmillassurance. 23/09/2014 Energy-saving ball mill is a ball mill designed by Yantai Xinhai Mining Machinery Co., Ltd. With low energy consumption, energy-saving and long service life, it is used for grinding all kinds of ores. Xinhai energy-saving ball millis one of grinding equipmentequipped with two horizontal ...Energy-saving ball mill ballmillassurance. 23/09/2014 Energy-saving ball mill is a ball mill designed by Yantai Xinhai Mining Machinery Co., Ltd. With low energy consumption, energy-saving and long service life, it is used for grinding all kinds of ores. Xinhai energy-saving ball millis one of grinding equipmentequipped with two horizontal ...

what is a energy saving ball mill - butterfly

Energy Saving Ball Mill china cfc cc. The energy saving ball mill is a key equipment for grinding after crushing process and its grinding media is a number of steel balls filled in the barrel the energy saving ball mill is widely used in production industries such as cement, refractory materials, chemical fertilizers, glass ceramics, as well as mineral processing, buildingEnergy Saving Ball Mill china cfc cc. The energy saving ball mill is a key equipment for grinding after crushing process and its grinding media is a number of steel balls filled in the barrel the energy saving ball mill is widely used in production industries such as cement, refractory materials, chemical fertilizers, glass ceramics, as well as mineral processing, building

Small Energy Saving Ball Mill In India - kubzda-trans.pl

energy saving ball mill capacity from machinery Ball Mill 1 Ton Per Hour. China Top Stone Ore Grinding Machine Ball Mill 1 130 Ton Per Hour. Add to Compare. Response .. Homemade capacity 1 ton 2 tons 5 tons per hour ball mill price for sale .. Energy Saving Small Scale Ball Mill For Africa Gold Ore Mining. Get price. Chat Onlineenergy saving ball mill capacity from machinery Ball Mill 1 Ton Per Hour. China Top Stone Ore Grinding Machine Ball Mill 1 130 Ton Per Hour. Add to Compare. Response .. Homemade capacity 1 ton 2 tons 5 tons per hour ball mill price for sale .. Energy Saving Small Scale Ball Mill For Africa Gold Ore Mining. Get price. Chat Online

The energy efficiency of ball milling in comminution ...

If the energy to produce new surface by single-particle breakage is used as the basis for evaluating efficiency, then the efficiency of ball milling has a more realistic value of about 15% for the comminution of quartz and soda-lime glass. In a second approach, comminution efficiency is based on comparing the energy to produce some size ...If the energy to produce new surface by single-particle breakage is used as the basis for evaluating efficiency, then the efficiency of ball milling has a more realistic value of about 15% for the comminution of quartz and soda-lime glass. In a second approach, comminution efficiency is based on comparing the energy to produce some size ...

Ball Mill Working Principle And Main Parts

2015-7-14  SBM ball mill is one of the new high efficient grinding machine,which is widely used in the in various types of stone grinding plant, ore benefication, electricity, cement and chemical industries.This new type ball mill with high comminution ratio, it can carry out dry or wet pulverizing and can meet demand for sustainable large-scale production.2015-7-14  SBM ball mill is one of the new high efficient grinding machine,which is widely used in the in various types of stone grinding plant, ore benefication, electricity, cement and chemical industries.This new type ball mill with high comminution ratio, it can carry out dry or wet pulverizing and can meet demand for sustainable large-scale production.

石头_石子制砂机重晶石_方解石制砂机 华盛铭厂家

2021-6-13  华盛铭重工大型生产厂家,30年的石头制砂机生产经验,拥有强大的售后服务团队,深入客户内心,提供重晶石子制砂机,方解石制砂机系列产品,免费安装试机,质量更可靠,价格更优惠.2021-6-13  华盛铭重工大型生产厂家,30年的石头制砂机生产经验,拥有强大的售后服务团队,深入客户内心,提供重晶石子制砂机,方解石制砂机系列产品,免费安装试机,质量更可靠,价格更优惠.

Ball Mill Energy Saving Dry Wet Ball Mill Made Hxq

Energy Saving Dry Wet Ball Mill Made Hxq Dustri Heavy. We have 40 years of experience in mechanical manufacturing and provide you with the most sophisticated equipments. Our query service team is here to help you 24/7. We can ship you parts, send field service technicians to your site and answer any questions you have. ... Algeria Small Sawdust ...Energy Saving Dry Wet Ball Mill Made Hxq Dustri Heavy. We have 40 years of experience in mechanical manufacturing and provide you with the most sophisticated equipments. Our query service team is here to help you 24/7. We can ship you parts, send field service technicians to your site and answer any questions you have. ... Algeria Small Sawdust ...

High efficiency Supply-energy saving Ball Mill/ball mill ...

Advantage Description. High Efficiency Supply-energy Saving Ball Mill/ball Mill For Sale Uk , Find Complete Details about High Efficiency Supply-energy Saving Ball Mill/ball Mill For Sale Uk,Planetary Ball Mill,Chocolate Ball Mill,Ball Mill For Sale Uk from Mine Mill Supplier or Manufacturer-Shicheng Oasis Mineral Equipment Manufacturing Co., Ltd.Advantage Description. High Efficiency Supply-energy Saving Ball Mill/ball Mill For Sale Uk , Find Complete Details about High Efficiency Supply-energy Saving Ball Mill/ball Mill For Sale Uk,Planetary Ball Mill,Chocolate Ball Mill,Ball Mill For Sale Uk from Mine Mill Supplier or Manufacturer-Shicheng Oasis Mineral Equipment Manufacturing Co., Ltd.

Global Energy Saving Ball Mill Market 2020 by ...

Energy Saving Ball Mill competitive landscape provides details by vendors, including company overview, company total revenue, market potential, global presence, Energy Saving Ball Mill sales and revenue generated, market share, price, production sites and facilities, SWOT analysis, product launch. For the period 2015-2020, this study provides ...Energy Saving Ball Mill competitive landscape provides details by vendors, including company overview, company total revenue, market potential, global presence, Energy Saving Ball Mill sales and revenue generated, market share, price, production sites and facilities, SWOT analysis, product launch. For the period 2015-2020, this study provides ...

Energy Saving Ball Mill, Energy Saving Ball Mill ...

Cylindrical energy saving grid ball mill is one of energy saving mills developed by Xinhai, which is easy to start and saves 20-30% energy. It is lined grooved ring plate which increases the contact surface of ball and ore and strengthens the grinding. In addition, Cylindrical energy saving grid ball mill is one of energy saving mills developed by Xinhai, which is easy to start and saves 20-30% energy. It is lined grooved ring plate which increases the contact surface of ball and ore and strengthens the grinding. In addition,

Energy Saving Durable Small Ball Mill

2020-1-30  Shanghai clirik ball mill supplier in china. Plcgreenenergy saving, no one likes this ball mill 2020-07-01 which small wet ball mill equipment manufacturer is good how about the price 2020-06-23 the ball mill line develops skills and attracts a lot of powder 2020-06-22 6.18 is coming, the ball mill is constantly in good supply, and the price is cheap 2020-06-.2020-1-30  Shanghai clirik ball mill supplier in china. Plcgreenenergy saving, no one likes this ball mill 2020-07-01 which small wet ball mill equipment manufacturer is good how about the price 2020-06-23 the ball mill line develops skills and attracts a lot of powder 2020-06-22 6.18 is coming, the ball mill is constantly in good supply, and the price is cheap 2020-06-.

what is a energy saving ball mill - butterfly

Energy Saving Ball Mill china cfc cc. The energy saving ball mill is a key equipment for grinding after crushing process and its grinding media is a number of steel balls filled in the barrel the energy saving ball mill is widely used in production industries such as cement, refractory materials, chemical fertilizers, glass ceramics, as well as mineral processing, buildingEnergy Saving Ball Mill china cfc cc. The energy saving ball mill is a key equipment for grinding after crushing process and its grinding media is a number of steel balls filled in the barrel the energy saving ball mill is widely used in production industries such as cement, refractory materials, chemical fertilizers, glass ceramics, as well as mineral processing, building

Small Energy Saving Ball Mill In India - kubzda-trans.pl

energy saving ball mill capacity from machinery Ball Mill 1 Ton Per Hour. China Top Stone Ore Grinding Machine Ball Mill 1 130 Ton Per Hour. Add to Compare. Response .. Homemade capacity 1 ton 2 tons 5 tons per hour ball mill price for sale .. Energy Saving Small Scale Ball Mill For Africa Gold Ore Mining. Get price. Chat Onlineenergy saving ball mill capacity from machinery Ball Mill 1 Ton Per Hour. China Top Stone Ore Grinding Machine Ball Mill 1 130 Ton Per Hour. Add to Compare. Response .. Homemade capacity 1 ton 2 tons 5 tons per hour ball mill price for sale .. Energy Saving Small Scale Ball Mill For Africa Gold Ore Mining. Get price. Chat Online

The energy efficiency of ball milling in comminution ...

If the energy to produce new surface by single-particle breakage is used as the basis for evaluating efficiency, then the efficiency of ball milling has a more realistic value of about 15% for the comminution of quartz and soda-lime glass. In a second approach, comminution efficiency is based on comparing the energy to produce some size ...If the energy to produce new surface by single-particle breakage is used as the basis for evaluating efficiency, then the efficiency of ball milling has a more realistic value of about 15% for the comminution of quartz and soda-lime glass. In a second approach, comminution efficiency is based on comparing the energy to produce some size ...

The energy efficiency of ball milling in comminution ...

2002-11-1  In terms of this concept, the energy efficiency of the tumbling mill is as low as 1%, or less. For example, Lowrison (1974) reported that for a ball mill, the theoretical energy for size reduction (the free energy of the new surface produced during grinding) is 0.6% of the total energy supplied to the mill 2002-11-1  In terms of this concept, the energy efficiency of the tumbling mill is as low as 1%, or less. For example, Lowrison (1974) reported that for a ball mill, the theoretical energy for size reduction (the free energy of the new surface produced during grinding) is 0.6% of the total energy supplied to the mill

石头_石子制砂机重晶石_方解石制砂机 华盛铭厂家

2021-6-13  华盛铭重工大型生产厂家,30年的石头制砂机生产经验,拥有强大的售后服务团队,深入客户内心,提供重晶石子制砂机,方解石制砂机系列产品,免费安装试机,质量更可靠,价格更优惠.2021-6-13  华盛铭重工大型生产厂家,30年的石头制砂机生产经验,拥有强大的售后服务团队,深入客户内心,提供重晶石子制砂机,方解石制砂机系列产品,免费安装试机,质量更可靠,价格更优惠.

Energy Saving Mineral Milling Ball Mill - Buy

Energy Saving Mineral Milling Ball Mill , Find Complete Details about Energy Saving Mineral Milling Ball Mill,Energysaving Mineral Ball Mill,Mineral Ball Mill,Milling Ball Mill from Mine Mill Supplier or Manufacturer-Jiangxi Sandrock Mining Equipments Co., Ltd.Energy Saving Mineral Milling Ball Mill , Find Complete Details about Energy Saving Mineral Milling Ball Mill,Energysaving Mineral Ball Mill,Mineral Ball Mill,Milling Ball Mill from Mine Mill Supplier or Manufacturer-Jiangxi Sandrock Mining Equipments Co., Ltd.

Ball Mill Energy Saving Dry Wet Ball Mill Made Hxq

Energy Saving Dry Wet Ball Mill Made Hxq Dustri Heavy. We have 40 years of experience in mechanical manufacturing and provide you with the most sophisticated equipments. Our query service team is here to help you 24/7. We can ship you parts, send field service technicians to your site and answer any questions you have. ... Algeria Small Sawdust ...Energy Saving Dry Wet Ball Mill Made Hxq Dustri Heavy. We have 40 years of experience in mechanical manufacturing and provide you with the most sophisticated equipments. Our query service team is here to help you 24/7. We can ship you parts, send field service technicians to your site and answer any questions you have. ... Algeria Small Sawdust ...

Energy Saving Ball Mill, Ball Mill Design, Ball Milling ...

[Introduction]: Energy-saving ball mill is a high efficient and energy-saving ball mill with rolling bearing. [Capacity]: Up to 160t/h [Improvement]: Cylindrical energy-saving grid ball mill is lined with the grooved ring plate which increases the contact surface of ball and ore, strengthens the grinding effect, and has the ability to improve the ore with lower energy consumption.[Introduction]: Energy-saving ball mill is a high efficient and energy-saving ball mill with rolling bearing. [Capacity]: Up to 160t/h [Improvement]: Cylindrical energy-saving grid ball mill is lined with the grooved ring plate which increases the contact surface of ball and ore, strengthens the grinding effect, and has the ability to improve the ore with lower energy consumption.

Energy Saving Ball Mill - m.xinhaiepc

Cylindrical energy saving grid ball mill is lined grooved ring plate which increases the contact surface of ball and ore and strengthens the grinding. Large ore outlet and large capacity; The mill with diameter below 2.1 meters adopts whole machine frame, which Cylindrical energy saving grid ball mill is lined grooved ring plate which increases the contact surface of ball and ore and strengthens the grinding. Large ore outlet and large capacity; The mill with diameter below 2.1 meters adopts whole machine frame, which

Energy Saving Ball Mill, Energy Saving Ball Mill ...

Cylindrical energy saving grid ball mill is one of energy saving mills developed by Xinhai, which is easy to start and saves 20-30% energy. It is lined grooved ring plate which increases the contact surface of ball and ore and strengthens the grinding. In addition, Cylindrical energy saving grid ball mill is one of energy saving mills developed by Xinhai, which is easy to start and saves 20-30% energy. It is lined grooved ring plate which increases the contact surface of ball and ore and strengthens the grinding. In addition,

Energy Saving Durable Small Ball Mill

2020-1-30  Shanghai clirik ball mill supplier in china. Plcgreenenergy saving, no one likes this ball mill 2020-07-01 which small wet ball mill equipment manufacturer is good how about the price 2020-06-23 the ball mill line develops skills and attracts a lot of powder 2020-06-22 6.18 is coming, the ball mill is constantly in good supply, and the price is cheap 2020-06-.2020-1-30  Shanghai clirik ball mill supplier in china. Plcgreenenergy saving, no one likes this ball mill 2020-07-01 which small wet ball mill equipment manufacturer is good how about the price 2020-06-23 the ball mill line develops skills and attracts a lot of powder 2020-06-22 6.18 is coming, the ball mill is constantly in good supply, and the price is cheap 2020-06-.

The energy efficiency of ball milling in comminution ...

2002-11-1  In terms of this concept, the energy efficiency of the tumbling mill is as low as 1%, or less. For example, Lowrison (1974) reported that for a ball mill, the theoretical energy for size reduction (the free energy of the new surface produced during grinding) is 0.6% of the total energy supplied to the mill 2002-11-1  In terms of this concept, the energy efficiency of the tumbling mill is as low as 1%, or less. For example, Lowrison (1974) reported that for a ball mill, the theoretical energy for size reduction (the free energy of the new surface produced during grinding) is 0.6% of the total energy supplied to the mill

The energy efficiency of ball milling in comminution ...

If the energy to produce new surface by single-particle breakage is used as the basis for evaluating efficiency, then the efficiency of ball milling has a more realistic value of about 15% for the comminution of quartz and soda-lime glass. In a second approach, comminution efficiency is based on comparing the energy to produce some size ...If the energy to produce new surface by single-particle breakage is used as the basis for evaluating efficiency, then the efficiency of ball milling has a more realistic value of about 15% for the comminution of quartz and soda-lime glass. In a second approach, comminution efficiency is based on comparing the energy to produce some size ...

Global Energy-Saving Overflow Ball Mill Market 2021

“Energy-Saving Overflow Ball Mill Market“(2021-2026) The transmission machinery of Energy-saving overflow ball mill substitutes large-scale double row self-aligning roller bearing...“Energy-Saving Overflow Ball Mill Market“(2021-2026) The transmission machinery of Energy-saving overflow ball mill substitutes large-scale double row self-aligning roller bearing...

石头_石子制砂机重晶石_方解石制砂机 华盛铭厂家

2021-6-13  华盛铭重工大型生产厂家,30年的石头制砂机生产经验,拥有强大的售后服务团队,深入客户内心,提供重晶石子制砂机,方解石制砂机系列产品,免费安装试机,质量更可靠,价格更优惠.2021-6-13  华盛铭重工大型生产厂家,30年的石头制砂机生产经验,拥有强大的售后服务团队,深入客户内心,提供重晶石子制砂机,方解石制砂机系列产品,免费安装试机,质量更可靠,价格更优惠.

Ball Mill Energy Saving Dry Wet Ball Mill Made Hxq

Energy Saving Dry Wet Ball Mill Made Hxq Dustri Heavy. We have 40 years of experience in mechanical manufacturing and provide you with the most sophisticated equipments. Our query service team is here to help you 24/7. We can ship you parts, send field service technicians to your site and answer any questions you have. ... Algeria Small Sawdust ...Energy Saving Dry Wet Ball Mill Made Hxq Dustri Heavy. We have 40 years of experience in mechanical manufacturing and provide you with the most sophisticated equipments. Our query service team is here to help you 24/7. We can ship you parts, send field service technicians to your site and answer any questions you have. ... Algeria Small Sawdust ...

Global Energy Saving Ball Mill Market Research Report

Global Energy Saving Ball Mill Market Research Report 2020 (Covid-19 Version) Published: June 2020. No. of Pages: 154. Price: Single User License: US $ 3500 US $ 2800. Corporate User License: US $ 7000 US $ 5600. Inquire for Discount. Download PDF. Request Sample.Global Energy Saving Ball Mill Market Research Report 2020 (Covid-19 Version) Published: June 2020. No. of Pages: 154. Price: Single User License: US $ 3500 US $ 2800. Corporate User License: US $ 7000 US $ 5600. Inquire for Discount. Download PDF. Request Sample.

Super Energy-Saving Ball Mill

Super Energy-Saving Ball Mill. Super energy-saving ball mill is the key equipment for further crushing, widely applicable for industries including but not limited to cement, silicate, new building materials, fireproof materials, fertilizer, ferrous and non-ferrous Super Energy-Saving Ball Mill. Super energy-saving ball mill is the key equipment for further crushing, widely applicable for industries including but not limited to cement, silicate, new building materials, fireproof materials, fertilizer, ferrous and non-ferrous

Energy Saving Lab Cpopper Ball Mill Machine For Sale

Energy saving ball mill energy saving ball mill . A high efficiency and energy savingball mill with rolling bearing . Capacity . Up to 160t/h . Product Improvement.Cylindrical energy saving grid ball mill is lined grooved ring plate which increases the. iron ore ball mill for sale - braaijacks.co.za Tags: Energy Saving Ball Mill For Iron Ore ...Energy saving ball mill energy saving ball mill . A high efficiency and energy savingball mill with rolling bearing . Capacity . Up to 160t/h . Product Improvement.Cylindrical energy saving grid ball mill is lined grooved ring plate which increases the. iron ore ball mill for sale - braaijacks.co.za Tags: Energy Saving Ball Mill For Iron Ore ...

Global Energy-Saving Overflow Ball Mill Market 2021

“Energy-Saving Overflow Ball Mill Market“(2021-2026) The transmission machinery of Energy-saving overflow ball mill substitutes large-scale double row self-aligning roller bearing...“Energy-Saving Overflow Ball Mill Market“(2021-2026) The transmission machinery of Energy-saving overflow ball mill substitutes large-scale double row self-aligning roller bearing...

The energy efficiency of ball milling in comminution ...

2002-11-1  In terms of this concept, the energy efficiency of the tumbling mill is as low as 1%, or less. For example, Lowrison (1974) reported that for a ball mill, the theoretical energy for size reduction (the free energy of the new surface produced during grinding) is 0.6% of the total energy supplied to the mill 2002-11-1  In terms of this concept, the energy efficiency of the tumbling mill is as low as 1%, or less. For example, Lowrison (1974) reported that for a ball mill, the theoretical energy for size reduction (the free energy of the new surface produced during grinding) is 0.6% of the total energy supplied to the mill

The energy efficiency of ball milling in comminution ...

If the energy to produce new surface by single-particle breakage is used as the basis for evaluating efficiency, then the efficiency of ball milling has a more realistic value of about 15% for the comminution of quartz and soda-lime glass. In a second approach, comminution efficiency is based on comparing the energy to produce some size ...If the energy to produce new surface by single-particle breakage is used as the basis for evaluating efficiency, then the efficiency of ball milling has a more realistic value of about 15% for the comminution of quartz and soda-lime glass. In a second approach, comminution efficiency is based on comparing the energy to produce some size ...

iron ore energy saving diesel grinding ball mill

Energy - saving ball mill as an old mill has unique advantage in limestone processing.After years of practice and continuous improvement energy-saving ball mill has been widely used in gypsum talc calcite limestone marble potash feldspar barite dolomite granite Energy - saving ball mill as an old mill has unique advantage in limestone processing.After years of practice and continuous improvement energy-saving ball mill has been widely used in gypsum talc calcite limestone marble potash feldspar barite dolomite granite

energy saving ball mill machine - apteka-nawidoku.pl

Energy Saving Ball Mill Manufacturers, Factory. 2020-10-30 We insist on the principle of development of 'High quality, Efficiency, Sincerity and Down-to-earth working approach' to deliver you with great provider of processing for Energy Saving Ball Mill, Pvc Conveyor Belt Vulcanizing Press Machine, Rubber Recycling Machinery, Waste Tire Rubber Powder Machine, We wish to just take this ...Energy Saving Ball Mill Manufacturers, Factory. 2020-10-30 We insist on the principle of development of 'High quality, Efficiency, Sincerity and Down-to-earth working approach' to deliver you with great provider of processing for Energy Saving Ball Mill, Pvc Conveyor Belt Vulcanizing Press Machine, Rubber Recycling Machinery, Waste Tire Rubber Powder Machine, We wish to just take this ...

Mining Processing Equipment, Mining Equipment,

The new grooved annular liner increases the ball ore contact surface, strengthens the grinding effect, and has the ability to lift the ore, reducing energy consumption; the large double-row spherical roller bearing design can greatly reduce the friction and effectively Energy saving 20-30%, and easy to start; the small ball mill with a diameter of 2.1 .The new grooved annular liner increases the ball ore contact surface, strengthens the grinding effect, and has the ability to lift the ore, reducing energy consumption; the large double-row spherical roller bearing design can greatly reduce the friction and effectively Energy saving 20-30%, and easy to start; the small ball mill with a diameter of 2.1 .