The invention provides a process for reducing heavy medium consumption in a coal preparation plant based on separate treatment by shunting. It mainly includes the following steps: raw coal is separated by dense medium and the product enters the demultiplexing screen; the front section of the demultiplexing screen becomes qualified medium and the back section becomes dilute medium; the dilute medium enters the dilute medium barrel; the qualified medium enters the qualified medium barrel through the diversion part, and the part enters the qualified medium magnetic separator after the demultiplexer is dispersed; the concentrate of the qualified medium magnetic separator enters the qualified medium barrel; The tailings enter the dilute medium barrel; the materials in the dilute medium barrel enter the dilute medium magnetic separator; the concentrates in the dilute medium magnetic separator return to the qualified medium barrel, and the tailings enter the slurry water treatment process. The characteristics of the present invention are to create favorable conditions for subsequent recovery by setting a demagnetizer to eliminate magnetic agglomeration of the medium, to improve the stability of the medium recovery link by using a magnetic separator alone for the qualified medium, to increase the stability and recovery capacity of the medium recovery process by adopting the process, and to reduce the medium consumption by more than 10%.
【技术实现步骤摘要】
一种基于分流单独处理降低选煤厂重介质消耗的工艺
本专利技术属于重介选煤领域,涉及重介质选煤过程介质回收工艺,特别涉及一种基于分流单独处理降低选煤厂重介质消耗的工艺。
技术介绍
重介质分选工艺是目前选煤厂的主流工艺,约有70%的原煤经过重介质分选工艺加工。重介质分选具有精度高、效率高、处理量大的优势,未来在选煤厂的比例越来越高。重介质消耗是选煤生产过程的主要消耗原料,占选煤厂加工成本的20%左右。介质损失还会带来设备磨损、煤泥水处理难等不利影响,因此降低介质消耗一直是选煤厂生产的重要任务。现有重介质主要通过脱介—磁选工艺回收循环利用,经过脱介筛筛下的合格介质分流和稀介质通过磁选机一次全部重介质。实际生产过程中,磁选机承担着脱泥与介质回收的双重任务,采用一次磁选同时实现脱泥与回收的难度较大。实际生产过程中由于经过反复磁选—分选循环,造成介质产生磁化。尤其是合格介质分流中介质含量较高,容易产生磁团聚现象,不利于重介质的回收,而在目前生产环节中并未得到重视。合格介质分流的目的是脱除重介悬浮液中的多余煤泥保持介质稳定性,磁选任务中的脱泥主要对象是合格介质分流。应该考虑单独处 ...
【技术保护点】
1.一种基于分流单独处理降低选煤厂重介质消耗的工艺,其特征在于:包括如下步骤:(1)原煤经过重介分选后产品进入脱介筛;(2)将经脱介筛处理后得到的合格介质分流成两股,一股进入合格介质桶,另一股经过脱磁器处理后进入合格介质磁选机;经脱介筛处理后得到的稀介质进入稀介质桶,稀介质桶物料进入稀介质磁选机;(3)合格介质磁选机和稀介质磁选机精矿返回合格介质桶。
【技术特征摘要】
1.一种基于分流单独处理降低选煤厂重介质消耗的工艺,其特征在于:包括如下步骤:(1)原煤经过重介分选后产品进入脱介筛;(2)将经脱介筛处理后得到的合格介质分流成两股,一股进入合格介质桶,另一股经过脱磁器处理后进入合格介质磁选机;经脱介筛处理后得到的稀介质进入稀介质桶,稀介质桶物料进入稀介质磁选机;(3)合格介质磁选机和稀介质磁选机精矿返回合格介质桶。2.根据权利要求1所述的基于分流单独处理降低选煤厂重介质消耗的工艺,其特征在于:分流至脱磁器的合格介质占经脱介筛处理后得到的合格介质的20%-40%。3.根据权利要求1所述的基于分流单独处理降低选煤厂重介质消耗的工艺,其特征在于:所述脱磁器为管道通过式。4.根据权利要求3所述的基于分流单独处理降低选煤厂重介质消耗的工艺,其特征在于:所述脱磁器为脉冲脱磁器或恒磁场脱磁器。5.根据权利要求1所...
【专利技术属性】
技术研发人员:王大鹏,胥萌,朱子祺,李琛光,张佳斌,
申请(专利权)人:中国矿业大学,
类型:发明
国别省市:江苏,32
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