降低湿法锌冶炼废渣中铅含量
发布时间：2019-04-24 12:04
【摘要】：针对锌废渣中重金属污染环境,尤其是废渣中铅含量高于1%,无法作为无害渣使用的问题,本文采用自动矿物分析仪(MLA)分析氯盐浸渣(对锌废渣经过焙烧-酸浸得到的酸浸渣进行氯盐浸出得到)中铅的物相主要为PbBa(SO_4)_2,盐酸或含HCl的饱和NaCl溶液可将其有效分解,可使尾渣中铅含量达到1%效果。在此基础上,研究不同浸出体系对酸浸渣进行一步浸出,以期选出较优的浸出体系及浸出条件,达到使废渣中的铅含量降到1%以下的目的。研究结果表明:"饱和NaCl溶液+补加HCl+补加NaCl"体系浸出酸浸渣的效果明显好于"含HCl的饱和NaCl溶液+补加NaCl"和"饱和NaCl溶液+补加NaCl"两种体系浸出酸浸渣的效果,但出于HCl成本高考虑,选取"饱和NaCl溶液+补加NaCl"作为浸出剂及浸出方式。"饱和NaCl+补加NaCl"浸出酸浸渣的反应条件为:酸浸渣50g,250m L饱和NaCl,温度≥60℃,反应2h后补加15g NaCl,继续反应3h,Pb的浸出率91%,Pb在尾渣中的含量达到0.85%≤Pb1%。
[Abstract]:In view of the environmental pollution caused by heavy metals in zinc waste slag, especially the lead content higher than 1% in the waste slag, it can not be used as harmless slag. In this paper, an automatic mineral analyzer (MLA) was used to analyze the lead phase in the leaching residue of chlorate (PbBa (SO_4) _ 2), which was obtained by leaching the acid leaching residue from zinc waste after roasting and acid leaching, and the main phase of lead was PbBa (SO_4) _ 2, Hydrochloric acid or saturated NaCl solution containing HCl can decompose it effectively, and the lead content in the tailings can reach 1%. On the basis of this, the one-step leaching of acid leaching residue with different leaching systems was studied in order to select the optimal leaching system and leaching conditions, so as to reduce the lead content in the waste slag to less than 1% in order to achieve the goal of reducing the lead content in the waste slag to less than 1%. The results showed that the leaching effect of "saturated NaCl solution supplemented with HCl plus NaCl" system was better than that of "saturated NaCl solution containing HCl supplemented with NaCl" and "saturated NaCl solution with NaCl", and the leaching effect of "saturated NaCl solution supplemented with NaCl" and "saturated NaCl solution with NaCl" was better than that of "saturated NaCl solution supplemented with NaCl" and "saturated NaCl solution added with NaCl". However, due to the high cost of HCl, "saturated NaCl solution supplemented with NaCl" is selected as the leaching agent and leaching method. " The reaction conditions of acid leaching residue by adding NaCl into saturated NaCl were as follows: acid leaching slag 50g, 250 mL saturated NaCl, temperature 鈮，
本文编号：2464433
[Abstract]:In view of the environmental pollution caused by heavy metals in zinc waste slag, especially the lead content higher than 1% in the waste slag, it can not be used as harmless slag. In this paper, an automatic mineral analyzer (MLA) was used to analyze the lead phase in the leaching residue of chlorate (PbBa (SO_4) _ 2), which was obtained by leaching the acid leaching residue from zinc waste after roasting and acid leaching, and the main phase of lead was PbBa (SO_4) _ 2, Hydrochloric acid or saturated NaCl solution containing HCl can decompose it effectively, and the lead content in the tailings can reach 1%. On the basis of this, the one-step leaching of acid leaching residue with different leaching systems was studied in order to select the optimal leaching system and leaching conditions, so as to reduce the lead content in the waste slag to less than 1% in order to achieve the goal of reducing the lead content in the waste slag to less than 1%. The results showed that the leaching effect of "saturated NaCl solution supplemented with HCl plus NaCl" system was better than that of "saturated NaCl solution containing HCl supplemented with NaCl" and "saturated NaCl solution with NaCl", and the leaching effect of "saturated NaCl solution supplemented with NaCl" and "saturated NaCl solution with NaCl" was better than that of "saturated NaCl solution supplemented with NaCl" and "saturated NaCl solution added with NaCl". However, due to the high cost of HCl, "saturated NaCl solution supplemented with NaCl" is selected as the leaching agent and leaching method. " The reaction conditions of acid leaching residue by adding NaCl into saturated NaCl were as follows: acid leaching slag 50g, 250 mL saturated NaCl, temperature 鈮，
本文编号：2464433
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