复盐结晶法对除菱锰矿浸出液中镁分配规律研究

doi:10.19964/j.issn.1006-4990.2022-0374

Abstract

Abstract:

The cyclic accumulation of Mg²⁺ in electrolytic manganese production system has become a common technical problem in the industry.Developing economical and practical magnesium removal method is in line with the technical development direction under the background of dual-carbon target.A complex salt crystallization method was studied to control the concentration of Mg²⁺ in electrolytic manganese system.Al₂（SO₄）₃∙18H₂O was added into the manganese sulfate solution to generate amorphous Al（OH）₃.Based on the special properties of amorphous Al（OH）₃and the traditional double salt crystallization technology，the concentration of Mg²⁺ in the manganese sulfate solution was controlled below 20 g/L.And the precursor of Mn-Mg-Al oxide with certain added value was obtained.By means of XRD，EDS and ICP-MS，the following conclusions were obtained by single factor and orthogonal experiment：when aluminum salt was added with aluminum magnesium molar ratio of 0.3，the reaction temperature was 80 ℃，the reaction pH was 6 and the reaction time was 1 h，the Mg²⁺ distribution coefficient was 0.43，the Mn²⁺ loss rate was 31.51%，the Mg²⁺ concentration in the solution was 17.525 g/L，and the Al³⁺ concentration was 0.205×10^-3 g/L，which reached the expected goal and ensured the healthy operation of the electrolytic manganese production system.

Key words: complex salt crystallization, MnSO₄ electrolyte, magnesium ammonium sulfate, distribution coefficient

CLC Number:

TF792

WANG Song, WANG Jiawei, GOU Bibo, YANG Pan, HE Yue, YANG Chunyuan, WANG Haifeng. Study on distribution law of magnesium in leaching solution of rhodochrosite by complex salt crystallization method[J]. Inorganic Chemicals Industry, 2023, 55(4): 65-71.

Figures/Tables 8

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Table 1

Table 2

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水平	因素
水平	A 铝盐加入量	B 反应时间/h	C 反应温度/℃	D 反应pH
1	0.2	1	40	4
2	0.3	2	60	5
3	0.4	3	80	6

编号	A	B	C	D	Mg²⁺分配系数	Mn²⁺损失率/%
1	1	1	1	1	0.21	26.11
2	1	2	2	2	0.22	28.62
3	1	3	3	3	0.34	30.01
4	2	1	2	3	0.46	32.31
5	2	2	3	1	0.35	30.96
6	2	3	1	2	0.46	34.36
7	3	1	3	2	0.48	36.58
8	3	2	1	3	0.43	30.99
9	3	3	2	1	0.32	30.21
Mg²⁺分配系数k₁	0.26	0.38	0.37	0.29
Mg²⁺分配系数k₂	0.43	0.33	0.33	0.39
Mg²⁺分配系数k₃	0.41	0.37	0.39	0.41
Mg²⁺分配系数极差R	0.17	0.05	0.06	0.12
Mn²⁺损失率k₁	28.25	31.67	30.49	29.09
Mn²⁺损失率k₂	32.54	30.19	30.38	33.19
Mn²⁺损失率k₃	32.59	31.53	32.52	31.10
Mn²⁺损失率极差R	4.35	1.48	2.14	4.09

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Study on distribution law of magnesium in leaching solution of rhodochrosite by complex salt crystallization method

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