Two Phase Flow Cyclone Recovery Application Of Fine Minerals In Jinning Phosphate Mine

Yunnan phosphating group is the largest state-owned phosphate ore proeessing and mining enterprises.Jinning phosphate rock scrubbing factory is a large modernized production workshop.During the production process,the phosphate rock is washed,desliming,graded and dehydrated with water as the medium.Thus increasing P₂O₅ content and producing different grade phosphate concentrate products satisfying market demand.After washing the mud,the overflow of ore washing machine with particle size less than1mm is sent to downstream hydrocyclone to carry out fractional desliming to produce powder phosphorus concentrate products.The cyclone is a three section open circuit,and the minimum recovery of particle size is+19 mm,and sometimes fine particles of 38 mm enter the tailings.The production rate and recovery rate of phosphate concentrate were reduced,which led to the waste of phosphate rock resources.At present,the market share of phosphate concentrate has been reduced from 30%to28%.In this way,we can recycle low-grade fine particle products of less than 19 m into concentrates.It creates conditions for increasing yield and recovery.However the 125swirler is recovered 38-19 mm and can not recover finer particle size.The ordinary cyclones used in production have the problems of overflow running,coarse sand,small sand inclusion,easy to plug and easy to wear（small bore）and so on,which leads to poor technical and economic indexes.The scrubbing plant began to transform the third stage cyclone in october 2012.instead of the original three section 75 and 125 ordinary three-phase flow hydrocyclone,a two phase two phase hydrocyclone is used.The problems of reducing the grade of the tailings of the scrubbing factory,increasing the yield and recovery of the concentrate and raising the rate of"one down two up"are solved.At the same time,it also provides valuable experience for the implementation of desliming scheme before flotation.With 75 phase flow cyclone in the feed concentration 14.29%,feeding pressure under the condition of 0.25mpa,the better the overflow effect index,to achieve the purpose of running much less,reducing the discharge of tailings,improve resource utilization efficiency.two phase flow cyclone cyclone air column due to the elimination of harmful effects,the velocity field,changes in magnitude,to increase the speed of cutting wedge and zero speed transition zone of rotary body,to improve the working process of centrifugal cyclone is an important principle than the cyclone is more reasonable;the recovery of fine products in the same class under the condition that the ratio of three-phase flow hydrocyclone can play better classification efficiency,and can be used in other type cyclone concentrator provide reliable evidence.