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

Abstract

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

CLC Number:

TQ132.2

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.

Figures/Tables 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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Serpentine coupled with copperas to enrich magnesium solution for simultaneous CO₂ mineralization and nickel recovery

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Serpentine coupled with copperas to enrich magnesium solution for simultaneous CO2 mineralization and nickel recovery