| The tungsten ore is brittle,and it is easy to be over-crushed during the grinding process,which seriously affects the separation effect.The paper takes tungsten ore in a certain place as the research object,and examines the particle size and size of the grinding products under different cyclic loads and steel ball systems in the ball milling-fine sieve circuit.Changes in metal distribution,monomer dissociation degree,total ore feeding particle size of the mill,grinding time,mill processing capacity and grinding process parameters,adjust the cyclic load and steel ball system for production to optimize the particle size and metal distribution of grinding products theoretical basis is provided.The cyclic load is changed by controlling the grinding time of the ball milling-fine screen circuit,and then batch grinding experiments are carried out on the total feed of the mill under the condition of closed-circuit grinding balance,and the overall balance model based on the crushing rate function and crushing distribution function is carried out.The variation of the parameters of the grinding process is discussed.The test and analysis results show that:As the cyclic load increases from 100% to 500%,the steel ball system 1(Φ19:Φ25:Φ37=60:36:4 (?)=21)circuit grinding time is reduced from 5.12 min to 1.57 min,and the grinding time The production capacity of the machine was increased from49.21 g/min to 53.06 g/min,the optional grade-0.106+0.01 mm in the grinding product,the particle size yield and metal distribution rate were increased by 4.39% and 11.17%,respectively,and the over-grinding grade was-0.01 mm.The particle size yield and metal distribution rate decreased by 4.39% and 8.27%,respectively,and the dissociation degree of the grinding product monomer increased by 2.61%;the steel ball system 2(Φ19:Φ27:Φ37=64:32:4 (?)=21.4)circuit grinding time was reduced from 5.42 min to1.65 min,mill production capacity was increased from 46.15 g/min to 50.48 g/min,optional grade-0.106+0.01 mm grain yield and The metal distribution rate increased by5.26% and 9.23% respectively,the over-grinding level-0.01 mm particle size content and metal distribution rate decreased by 5.27% and 9.23% respectively,and the dissociation degree of the grinding product monomer increased by 2.73%;Grade-0.074+0.038 mm fraction yields tend to decrease,but metal distribution rates tend to increase.With the increase of the cyclic load and the decrease of the average ball diameter of the mixed ball group in the mill,the total feed particle size of the mill tends to become finer,the weight and change rate of the fine particle size tend to decrease,and the weight and change rate of the coarse particle size tend to decrease.tends to increase;the crushing rate of each grade tends to decrease,and the variation range is gradually reduced.To a certain extent(C=100%～500%),increasing the cyclic load will reduce the total ore feeding particle size of the mill,and in the calculated suitable steel ball diameter,choose the steel ball ratio with the smaller average ball diameter It will strengthen the grinding of the intermediate grades and reduce the grinding rate of the fine grades,but it is beneficial to reduce the generation of fine grades in the grinding products,help to reduce over-grinding and its particle size metal distribution rate,and help Improve the processing capacity of the circuit mill and the dissociation degree of the grinding product monomer,which is beneficial to the separation. |
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