Optimization of process flow for improving mill efficiency in a concentrator
The raw ore of a V-Ti magnetite concentrator is treated in a scale of 9 million t/a.the process of one-stage semi-self-grinding+two-stage ball-grinding+stage-grinding stage-selecting is adopted to recover iron and titanium concentrate.The production and operation cost is high since the operation.After several process investigations,it is concluded that the efficiency of the two-stage mill is low,and its unit volume processing capacity is only 0.49 t/(h·m3).It is much lower than the same type of concentrator with similar ore properties and process flow,and its unit volume processing capacity can reach 0.92 t/(h·m3).In order to improve the efficiency of the two-stage mill and reduce the production and operation cost,the concentrator carried out a series of process optimization and transformation.The original 4 two-stage mills are first changed to 3 two-stage mills for production test.After all production indicators are normal,the 3 mills are changed to 2 mills.The unit volume processing capacity of the two-stage mill is successfully increased from 0.49 t/(h·m3)to 0.875 t/(h·m3),and the efficiency of the two-stage mill after the transformation is increased by 78.6%compared with that before the transformation,and the energy consumption is greatly reduced.The production cost could be saved by 1.62 yuan per ton of raw ore,and the annual production and operation cost could be saved by 14.587 7 million yuan.
two-stage ball millingmill efficiencyunit volume processing capacityoptimization and transformationproduction and operation costenergy consumption
NETL
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