不同破碎方法下锡石多金属硫化矿磨矿能耗研究

Study on the Grinding Energy Consumption of Cassiterite Polymetallic Sulfide Ore Under Different Broken Modes

针对广西大厂锡石多金属硫化矿矿石,分别进行JK落重冲击破碎和传统颚式挤压破碎,再对两种破碎产物分别进行磨矿试验,并利用破碎能量模型,研究两种破碎方法对锡石多金属硫化矿破碎能耗的影响,并在Bond破碎功指数基础上,提出落重冲击破碎能耗模型。结果表明:与传统颚式挤压破碎相比,落重冲击破碎产物在细粒级中分布比重较小,在粗粒级中分布比重较大,且其产物形状比较均匀,多呈立方体状,而颚式挤压破碎产物形状比较杂乱,多呈针片状。一定磨矿时间内,磨矿时间与磨矿能耗呈正比例关系,JK落重冲击破碎产物的单位磨矿能耗低,两者最大能耗比为2.547倍,这说明对锡石多金属硫化矿采用冲击破碎方式更有利于节能降耗。

Cassiterite polymetallic sulfide ores in Dachang mine of Guangxi were crushed by JK fall-weight impact crusher and traditional jaw squeeze crusher respectively, and grinding testes on the crushed product from these two crushing processes were respectively carried out. The influences of these two crushing processes on the grinding energy consumption of cassiterite poly- metallic sulfide ore were researched according to the energy crushing model. Based on the Bond crushing work index, the fall- weight crushing power model was proposed. The results showed that compared with the traditional squeeze jaw crusher, the crushed product from fall-weight impact crusher accounted for a small distribution proportion in fine fraction and a large distri- bution proportion in coarse fraction, which mostly presented uniform and cubic shape. However, the crushed product from tra-ditional squeeze jaw crusher presented complex and needle shape. In a certain grinding time, there was a positive proportion re- lationship between the grinding time and the energy consumption. The unit grinding energy consumption of crushed product from fall-weight impact crusher was lower, and the biggest energy consumption ratio was 2.547, which indicated that the im- pact crushing method was better than traditional jaw squeeze crushing method for energy saving aimed at the cassiterite poly- metallic sulfide ore.