破碎方式对某磁铁矿石磨矿速度和Bond球磨功指数的影响

The Influence of Crushing Modes on Grinding Speed and Ball Mill Work Index of the Magnetite Iron Ore

为验证破碎方式对磨矿速度和Bond球磨功指数的影响,使用某磁铁矿选矿厂的鄂式破碎产品、圆锥破碎产品和高压辊磨产品,分别进行磨矿动力学试验和Bond球磨功指数试验。结果表明:①高压辊磨产品的可磨性最好,圆锥破碎产品次之,鄂式破碎产品最差。同一破碎产品的磨矿速度随着磨矿时间的增加而降低。不同破碎产品,随着磨矿时间增加,颗粒性质逐步均匀并接近,磨矿速度逐步接近,破碎方式对磨矿速度的影响逐步降低。②Bond球磨功指数试验表明,在磨矿产品粒度大于0.10 mm时,破碎方式对磨矿的能耗影响显著,高压辊磨产品最节能;当磨矿产品粒度小于0.10 mm时,破碎方式对磨矿的能耗影响降低。破碎工艺中增加高压辊磨机,对于增大磨机处理量、降低磨矿能耗十分有益。

In order to verify the effect of crushing modes on grinding speed and Bond ball grinding work index,the grinding dynamics test and Bond ball grinding work index test were respectively carried out by using the jaw crusher product,cone crusher product and high pressure roller grinding product of a magnetite concentrator.The results showed that:①the grinding effect of high pressure roller mill is the best,followed by the cone crusher product and the jaw crusher.The grinding speed of the same crushing product decreases with the increase of grinding time.For different crushing products,with the increase of grinding time,particle properties and grinding speed are gradually uniform and close to each other.And the influence of crushing modes on grinding speed is gradually unconspicuous.②The test of Bond ball grinding work index showed that when the particle size of the grinding product is larger than 0.10 mm,the crushing modes has a significant impact on the energy consumption of the grinding product,and the high pressure roller grinding product is the most energy-saving.When the particle size of the grinding product is less than 0.10 mm,the impact of crushing modes on the energy consumption of the grinding product is reduced.The uasage of high pressure roller mill in crushing process is beneficial to increase the processing capacity of mill and reduce the grinding energy consumption.