蛇纹石与绿矾耦合提取富镁溶液 矿化二氧化碳并回收镍

doi:10.19964/j.issn.1006-4990.2022-0139

摘要/Abstract

摘要：

蛇纹石与绿矾耦合提取镁用于矿化二氧化碳，并富集回收蛇纹石中的镍，这为处理蛇纹石和绿矾提供了一条新的路径。为得到富镁溶液，同时从溶液中分离镍，以蛇纹石与绿矾混合焙烧-浸出后得到的溶液为研究对象，采用水解沉淀法除铁，二乙基二硫代氨基甲酸钠（DDTC）络合法分离镍镁，得到镍的产物和富镁溶液并将其用于二氧化碳矿化。结果表明，该方法能够高效地去除杂质、分离镍镁。在30 ℃、pH为5.0条件下，铁的去除率达97.36%，而镍、镁的损失率较低。在最佳络合条件下，镍的络合率达到99.50%，而镁的损失率仅为3.03%。此外，对络合机理进行了研究，DDTC中的特征官能团是—SH，络合之后镍和铁分别以Ni[（C₂H₅）₂NCS₂]₂，Fe[（C₂H₅）₂NCS₂]₃的形式存在，而镁不会被络合。富镁溶液在80 ℃下矿化率达92.63%。每1 000 kg蛇纹石可固定227.38 kg的二氧化碳，同时回收33.69 kg的DDTC-Ni（含7.09 kg氧化镍）。

关键词: 蛇纹石, DDTC, 络合, CO₂矿化

Abstract:

Serpentine coupled with copperas to extract and enrich Mg for CO₂ mineralization and Ni recovery from serpentine provides a novel route for processing serpentine and copperas.In order to obtain Mg-rich solution and simultaneously separate Ni from solution，the leaching solution which containing Ni，Fe，Mg was investigated in this study.The impurities were removed by hydrolyzing precipitation，and Ni was separated from Mg by DDTC（C₅H₁₀NNaS₂?3H₂O） complexing.Furthermore，the produced nickel oxide，and the Mg-rich solution were used for CO₂ mineralization.The results indicated that this route could efficiently remove Fe and separate Ni.The results showed that the precipitation ratio of Fe reached 97.36%，but the loss ratio of Ni and Mg was low at 30 ℃，pH of 5.0.Besides，the precipitation ratio of Ni was 99.50%，while the loss ratio of Mg was 3.03% at optimal complexation conditions.The complexation mechanism of the complexation was also analyzed.The characteristic functional group of DDTC was—SH.The Ni and Fe existed in the form of Ni[（C₂H₅）₂NCS₂]₂，Fe[（C₂H₅）₂NCS₂]₃ after complexing，respectively.However，Mg wasn′t complexed.Finally，the carbonation conversion of Mg²⁺ was 92.63% at 80 ℃.The mass of 227.38 kg CO₂ could be sequestrated by per 1000 kg serpentine and simultaneously recover 33.69 kg DDTC-Ni（contain 7.09 kg NiO）.

Key words: serpentine, DDTC, complexing, CO₂ mineralization

中图分类号:

TQ132.2

翁定崧,王正豪,陈良,殷仁涛,肖海兵,刘维燥,梁斌,罗冬梅. 蛇纹石与绿矾耦合提取富镁溶液矿化二氧化碳并回收镍[J]. 无机盐工业, 2023, 55(1): 93-99.

WENG Dingsong,WANG Zhenghao,CHEN Liang,YIN Rentao,XIAO Haibing,LIU Weizao,LIANG Bin,LUO Dongmei. Serpentine coupled with copperas to enrich magnesium solution for simultaneous CO₂ mineralization and nickel recovery[J]. Inorganic Chemicals Industry, 2023, 55(1): 93-99.

图/表 15

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元素	Fe（Ⅲ）络合物Fe（DDTC）₃		Ni（Ⅱ）络合物Ni（DDTC）₂
元素	理论值	实验值	理论值	实验值
C	36.00	36.71	33.83	34.72
H	6.00	6.18	5.64	4.44
N	8.40	8.52	7.89	8.10
S	38.40	39.20	36.09	37.08
Me	11.20	11.09	16.55	15.66

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