宝钢钢渣磁选尾矿脱磷清洁生产新工艺的研究

发布时间：2018-03-25 01:29

  本文选题：钢渣尾矿　切入点：浸出　出处：《安徽工业大学》2015年硕士论文

【摘要】：我国是钢铁生产大国,钢渣产量巨大,但利用率较低,仅为30~40%。而钢渣在钢铁企业内部循环利用是促使钢渣少排放以致零排放的最佳途径,也是钢渣大宗量应用的最好途径。但是,钢渣在钢铁企业内部循环利用遇到了磷富集问题。因此,脱除钢渣中的磷是钢渣作为部分烧结替代熔剂使用的关键研究课题。本课题根据化学选矿、湿法冶金原理与探索试验,提出宝钢钢渣磁选尾矿脱磷清洁生产的新工艺。研究了氯化铵溶液处理宝钢钢渣磁选尾矿的浸出性能,获得的氯化铵溶液处理钢渣磁选尾矿的最佳工艺条件为:氯化铵与氧化钙的物质的量比为2:1;钢渣粒度200目;浸出温度室温(20~25℃);液固比(v/m)5:1;搅拌强度380 r·min-1;搅拌时间90 min。在此条件下,钢渣磁选尾矿浸出率可达到18.70%左右。浸出后的料浆滤液经补氨和通二氧化碳沉钙获得可作为烧结原料的碳酸钙。沉钙后滤液调整氯化铵浓度,返回循环浸出钢渣磁选尾矿。硫酸浸出氯化铵浸渣的最佳工艺条件为:硫酸质量分数为10%、钢渣尾矿粒度为200目、室温(20~25℃)、液固比(v/m)8:1、搅拌强度230 r·min-1及搅拌时间90 min。在此条件下,酸浸脱磷率稳定在80%以上。分离出来的硫酸浸出渣含磷(P2O5)仅为0.292%,可以直接用作烧结原料。酸浸液石灰混凝沉淀脱磷的最佳工艺条件与参数为:石灰实际投入量与理论投入量比2.17:1,反应时间60 min,反应后沉降时间3.5 h,反应温度为室温(20~25℃),搅拌强度230 r·min-1。在此条件下,除磷率在98%以上,且除磷渣还可以进一步加工为其他化工产品。宝钢钢渣磁选尾矿脱磷清洁生产的新工艺,可分离出更多的无磷烧结原料,使钢渣达到了有效利用,降低了钢铁企业废渣的排放,可作为钢铁企业钢渣尾矿综合利用技术。
[Abstract]:Our country is a big country of iron and steel production, the output of steel slag is huge, but the utilization ratio is low, it is only 30 ~ 400.The best way to promote steel slag discharge is to recycle steel slag in iron and steel enterprises. It is also the best way to apply large amount of steel slag. However, the recycling of steel slag in iron and steel enterprises has encountered the problem of phosphorus enrichment. The removal of phosphorus from steel slag is a key research topic in the use of steel slag as a partially sintered alternative flux. This subject is based on chemical ore dressing, hydrometallurgical principles and exploratory tests. A new process of dephosphorization and clean production of steel slag magnetic separation tailings in Baosteel was put forward. The leaching performance of ammonium chloride solution for treating Baosteel steel slag magnetic separation tailings was studied. The optimum processing conditions of ammonium chloride solution for magnetic separation tailings of steel slag are as follows: the ratio of ammonium chloride to calcium oxide is 2: 1, the particle size of steel slag is 200 mesh; The leaching temperature is 20 ~ 25 鈩，

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