矿化剂对水热合成ZnS晶体结构及可浮性的影响

来源期刊:中南大学学报(自然科学版)2015年第8期

论文作者:梁彦杰 闵小波 王延 柴立元 柯勇 陈杰

文章页码:2812 - 2819

关键词:矿化剂;水热硫化;晶体结构;可浮性

Key words:mineralizer; hydrothermal sulfide; crystal structure; floatability

摘    要:以某冶炼厂含锌废渣为研究对象,通过在水热硫化过程中添加矿化剂调控人造硫化矿晶体结构,提高人造硫化矿的可浮性。研究结果表明:添加矿化剂NaCl时,NaCl浓度0.1 mol/L为最佳浓度,Zn富集比从1.16提高到1.36;添加矿化剂CH3COONa时,CH3COONa浓度0.5 mol/L为最佳浓度,Zn富集比从1.16提高到1.62;添加矿化剂EDTA-2Na时,0.1 mol/L EDTA-2Na为最佳浓度,Zn富集比从1.16提高到1.69。矿化剂的添加对Zn回收率无明显影响,回收率仍在60%左右。添加矿化剂NaCl后,ZnS晶粒粒度从21.0 nm提高到35.9 nm;添加矿化剂CH3COONa使ZnS晶粒粒度从20.8 nm提高到35.3 nm;添加矿化剂EDTA-2Na使ZnS晶粒粒度从21.4 nm提高到37.6 nm。0.1 mol/L 的EDTA-2Na为最优矿化剂。在添加上述矿化剂后,ZnS晶体颗粒由无定型的絮状颗粒转变为致密粗大的颗粒,且加入矿化剂有利于减小ZnS与CaSO4晶体的团聚夹杂现象,从而有利于水热合成人造硫化锌晶体的浮选分离。

Abstract: In order to modify the crystal structure and improve the floatability of synthetic metal sulfide, mineralizers were added during the hydrothermal sulfidation of Zn-contained residue, discharged from a smelting plant. The results show that the enrichment ratio of ZnS increases from 1.16 to 1.36 after adding 0.1 mol/L NaCl, the enrichment ratio of ZnS increases from 1.16 to 1.62 after adding 0.5 mol/L CH3COONa, and the enrichment ratio of ZnS increases from 1.16 to 1.69 after adding 0.1 mol/L EDTA-2Na. The grain size of ZnS crystal increases from 21.0 nm to 35.9 nm after adding NaCl, increases from 20.8 nm to 35.3 nm after adding CH3COONa, and increases from 21.4 to 37.6 nm after adding EDTA-2Na. As a result it is concluded that EDTA-2Na is the optimal mineralizer, and the optimum concentration is 0.1 mol/L. The amorphous flocculent particles of ZnS turn into dense massive ZnS after the addition of mineralizers, and distinct decrease of the agglomeration between ZnS and CaSO4 can be observed, which is in favour of the flotation and separation of artificial sulfur ore.

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