降低濕法鋅冶煉廢渣中鉛含量
發(fā)布時間：2019-04-24 12:04
【摘要】：針對鋅廢渣中重金屬污染環(huán)境,尤其是廢渣中鉛含量高于1%,無法作為無害渣使用的問題,本文采用自動礦物分析儀(MLA)分析氯鹽浸渣(對鋅廢渣經過焙燒-酸浸得到的酸浸渣進行氯鹽浸出得到)中鉛的物相主要為PbBa(SO_4)_2,鹽酸或含HCl的飽和NaCl溶液可將其有效分解,可使尾渣中鉛含量達到1%效果。在此基礎上,研究不同浸出體系對酸浸渣進行一步浸出,以期選出較優(yōu)的浸出體系及浸出條件,達到使廢渣中的鉛含量降到1%以下的目的。研究結果表明:"飽和NaCl溶液+補加HCl+補加NaCl"體系浸出酸浸渣的效果明顯好于"含HCl的飽和NaCl溶液+補加NaCl"和"飽和NaCl溶液+補加NaCl"兩種體系浸出酸浸渣的效果,但出于HCl成本高考慮,選取"飽和NaCl溶液+補加NaCl"作為浸出劑及浸出方式。"飽和NaCl+補加NaCl"浸出酸浸渣的反應條件為:酸浸渣50g,250m L飽和NaCl,溫度≥60℃,反應2h后補加15g NaCl,繼續(xù)反應3h,Pb的浸出率91%,Pb在尾渣中的含量達到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，
本文編號：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，
本文編號：2464433
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