A study on grinding and energy input in stirred media mills

Zheng, Jie; Harris, C.C.; Somasundaran, P.

doi:10.1016/0032-5910(95)03051-4

Cited by 56 publications

(30 citation statements)

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“…), and p=media density (g/cm 3 ). A similar equation was given by Gao et al [8], based on experiments using a 6-liter, horizontal, disk-type stirred ball mill using operating conditions of media density: 2.5-5.4 g/ cm 3 , slurry density: 65-75 wt.%, and stirrer speed: 805-2253 rpm. A dispersant was used at a level of 0.5-1.5% of the solids.…”

Section: Mill Powermentioning

confidence: 85%

“…[8] studied the energy efficiency of stirred media mills with pin-type stirrers in the grinding of limestone with glass beads. It was found that as the impeller speed was increased, the product surface area and energy input increased, but energy efficiency declined.…”

Section: Energy Efficiencymentioning

confidence: 99%

“…A more detailed study of the relationship between media size and particle size and critical stress intensity would be invaluable in the optimization of grinding conditions. The relationship for the particle size range below the maximum can be fitted to a simple power function (18) S; = sa(:~r (8) where S; is the specific rate of breakage for particles of size x;, x 0 is a standard particle size, So is the specific rate of breakage at size X 0 , and a is a constant.…”

Section: Process Modelingmentioning

confidence: 99%

“…Zeng et al [8,10] developed a method for predicting the power consumption of stirred ball milling in terms of power number and Reynolds Number. The KONA No.…”

Section: Mill Powermentioning

confidence: 99%

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A Review of Breakage Behavior in Fine Grinding by Stirred-Media Milling

Hogg¹,

Cho

2000

KONA

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Section: Mill Powermentioning

confidence: 85%

Section: Energy Efficiencymentioning

confidence: 99%

Section: Process Modelingmentioning

confidence: 99%

“…Zeng et al [8,10] developed a method for predicting the power consumption of stirred ball milling in terms of power number and Reynolds Number. The KONA No.…”

Section: Mill Powermentioning

confidence: 99%

See 2 more Smart Citations

A Review of Breakage Behavior in Fine Grinding by Stirred-Media Milling

Hogg¹,

Cho

2000

KONA

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“… bilya şekli ve türü,  karıştırma hızı,  bilya yoğunluğu,  bilya çapı ve şarj oranı,  pülp yoğunluğu ve  viskozitedir [1, 11,12]. Aşağıda bunlardan bazıları açıklanmaktadır.…”

Section: İşlem Parametreleriunclassified

Yatay Kariştirmali Bi̇lyali Deği̇rmen: Isamill

Toraman

Çayırlı

Öksüzoğlu

2016

Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi

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ÖZETMount Isa Mines ve Netzsch GmbH şirketleri Almanya'da boya endüstrisinde kullanılan yatay Netzsch karıştırmalı değirmenlerden Isamill'i geliştirmişlerdir. Isamill mineral endüstrisinde kullanılan yüksek hızlı karıştırmalı değirmendir. Yüksek kapasiteye sahip olması (100 t/s), çok ince ürün boyutu oluşturması (d 80 =7 µm), düşük maliyetli doğal öğütücü ortam kullanması ve yüksek enerji etkinliği sağlaması Isamill'in önemli avantajlarıdır. Yapılan çalışmalarda Isamill'in bilyalı değirmenlere göre % 75'ten daha fazla enerji tasarrufu sağladığı görülmektedir. Isamill genellikle baz metaller (bakır, kurşun, çinko ve nikel), endüstriyel uygulamalar ve altın prosesi için kullanılmakta olup, konsantrelerin yeniden öğütülmesinde, ince/çok ince öğütmede ve primer öğütmede uygun bir seçenek olmaktadır. Bu derlemede; yatay karıştırmalı bilyalı değirmenler hakkında (ISAMILL) güncel bilgiler ve teknolojiler sunulmaktadır.Anahtar Kelimeler: Yatay karıştırmalı değirmen, Isamill, ince/çok ince öğütme, ürün boyutu HORIZONTAL STIRRED BALL MILL: ISAMILL ABSTRACTMount Isa Mines and Netzsch GmbH companies have developed Isamill from Netzsch horizontal stirred mills which are used in the paint industry in Germany. Isamill is a high-speed stirred mill used in mineral industry. The significant advantages of the Isamill include: high capacity (100 t/h), creating a very fine product size (d 80 =7 µm), the ability to use low-cost natural grinding media and high energy efficiency. According to the studies carried out, Isamill offers more than 75% energy saving compared to conventional ball mills. It is usually used for base metals (copper, lead, zinc and nickel), industrial applications and gold process and a suitable choice for, fine/ultra-fine grinding, re-grinding of concentrates and primary grinding. In this review, recent information and technologies about horizontal stirred ball mills is presented. Keywords:Horizontal stirred mill, Isamill, fine/ultra-fine grinding, product size GİRİŞBir cevher hazırlama tesisindeki en önemli süreçlerden birisini mineral tanelerinin serbestleşmesini sağlamak için uygulanacak boyut küçültme (kırma ve öğütme) işlemleri oluşturmaktadır. Bu işlemler için gerekli enerji ise, işletme maliyetlerinin yaklaşık %70'ini oluşturmaktadır. Kırma işlemi sonrası öğütülecek cevherin tane boyutu esas alındığında 4 öğütme aşamasından söz edilebilir. Bunlar; i. Ürünün % 80'inin 75 µm altına geçtiği "klasik öğütme", ii. 75-30 µm boyutunda daha ince tane üretmek için gerçekleştirilen "yeniden öğütme", iii. 30-10 µm aralığında ürün elde etmek için uygulanan ve oldukça yeni bir alan olan "ince (fine) öğütme" iv. 10 µm altı ürün için gerçekleştirilen "çok ince (ultra fine) öğütme" Gerek "ince/çok ince" olarak adlandırılan boyutlardaki endüstriyel mineral ihtiyacındaki artış, gerekse yüksek tenörlü cevher yataklarının tükenmesi sonucu serbestleşme tane boyutu çok ince olan düşük tenörlü yatakların ve * Corresponding author / Sorumlu yazar.

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A Simulation Study of Laboratory Scale Ball and Vertical Stirred Mills

Samanli

Cuhadaroglu

Kizgut

2009

Part & Part Syst Charact

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The aim of this study was to investigate the grindability of solid fossil fuels from a thermal power plant by using a vertical stirred mill and conventional ball mill. The solid fossil fuel sample was obtained from the Zonguldak Catalagzi thermal power plant in Turkey. The sample below 3350 μm (d80 = 2100 μm) was ground in the laboratory scale stirred mill and ball mill. The d80 sizes of the products at the end of grinding periods of 0.25, 0.50, 1 and 4 min in the stirred mill were determined as 190, 102, 78 and 28 μm, respectively. For this purpose, the stirred mill was used at a stirring speed of 360 rpm and with a 6 mm diameter ball. In the ball mill, the d80 sizes of product after 1, 4, 8, 12 and 24 min of grinding were determined as 1802, 1130, 324, 167 and 81 μm, respectively. The results indicated that grinding by means of a stirred mill was much more efficient than grinding with a ball mill in terms of size distribution of the products. The energy consumption of the product with d80 = 78 μm was obtained as 10.53 kWh/t after 1 min of grinding time in the laboratory scale stirred mill. In the same manner, the energy consumption of product with d80 = 81 μm by using the laboratory scale ball mill was 72.73 kWh/t after 24 min of grinding. It can be clearly seen that the d80 size of the fossil fuel reduced from 2100 μm to 1130 μm after a 4 min grinding period in the ball mill grinding tests. However, the d80 size of the solid fossil fuel reduced to 28 μm after the same grinding time in the stirred mill and it was also possible to efficiently obtain size reduction below 100 μm. However, the ball mill grinding process cannot provide this efficient size reduction for longer grinding times. The ball mill grinding experimental results and simulation results showed that they were fairly consistent with each other. The simulation of higher speed mills such as pin type stirrers has been extensively investigated for relatively small‐scale applications by JKSimMet. In this study, the JKSimMet software package was adapted for a stirred mill with the help of the base model of ball milling.

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A study on grinding and energy input in stirred media mills

Cited by 56 publications

References 3 publications

A Review of Breakage Behavior in Fine Grinding by Stirred-Media Milling

A Review of Breakage Behavior in Fine Grinding by Stirred-Media Milling

Yatay Kariştirmali Bi̇lyali Deği̇rmen: Isamill

A Simulation Study of Laboratory Scale Ball and Vertical Stirred Mills

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