制备碳酸锂结晶的工艺优化

doi:10.11962/1006-4990.2018-0490

Abstract

Abstract:

The experimental study on the crystallization of lithium-containing brine in the process of preparing high-purity lithium carbonate by reaction of lithium chloride with sodium carbonate was carried out.The process parameters for the preparation of lithium carbonate by reaction crystallization was optimized by investigating the effects of reaction crystallization initial concentration,reaction temperature,feed rate,seed dosage,stirring rate,feed concentration and additives on the average particle size and crystal morphology of lithium carbonate products. Results showed that the morphology,particle size and solid-liquid separation effect of lithium carbonate crystal could be changed by regulating the reaction crystallization process of lithium carbonate under different optimized parameters.

Key words: lithium carbonate, lithium chloride, reaction crystallization

CLC Number:

TQ131.11

Chen Jie,Chen Xia. Crystallization process optimization for preparation of lithium carbonate[J]. Inorganic Chemicals Industry, 2019, 51(8): 29-32.

Figures/Tables 10

References 10

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Li⁺初始质量浓度/（g·L^-1）	收率/ %	纯度/ %	平均粒径/μm	Li⁺初始质量浓度/（g·L^-1）	收率/ %	纯度/ %	平均粒径/μm
4.0	68.21	90.29	32.65	7.0	75.65	95.67	40.75
5.0	69.47	91.80	33.46	8.0	78.90	97.17	51.91
6.0	71.56	93.99	35.01

反应温度/℃	收率/ %	纯度/ %	平均粒径/μm	反应温度/℃	收率/ %	纯度/ %	平均粒径/μm
25	72.79	91.07	31.05	80	79.05	98.01	45.26
45	74.25	93.37	38.01	90	79.95	98.04	44.12
65	76.13	95.71	38.96

搅拌速率/ （r·min^-1）	收率/ %	纯度/ %	平均粒径/μm	搅拌速率/ （r·min^-1）	收率/ %	纯度/ %	平均粒径/μm
100	73.46	94.31	34.12	250	74.65	92.38	50.02
150	75.60	94.96	39.11	300	73.21	91.39	49.02
200	79.79	97.06	51.12

加料速率/ （次·h^-1）	收率/ %	纯度/ %	平均粒径/μm	加料速率/ （次·h^-1）	收率/ %	纯度/ %	平均粒径/μm
2	72.67	92.63	36.12	5	75.02	94.36	42.31
3	74.66	93.95	39.25	6	74.19	94.25	42.12
4	77.79	96.32	45.86

水平	因素				产物粒径/μm
水平	A 加料速率/ （次·h^-1）	B 晶种用量/ %	C 搅拌速率/ （r·min^-1）	D 反应温度/℃	产物粒径/μm
1	3	1	150	65	55.66
2	3	2	200	80	60.21
3	3	4	250	90	37.29
4	4	1	200	90	39.51
5	4	2	250	65	45.99
6	4	4	150	80	42.72
7	5	1	250	80	39.37
8	5	2	150	90	40.52
9	5	4	200	65	22.10
k₁	51.05	44.85	46.30	41.25
k₂	42.74	48.90	40.60	47.43
k₃	34.00	34.03	40.88	39.10
R	17.06	14.87	5.69	8.33

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Crystallization process optimization for preparation of lithium carbonate

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实验序号	纯度/ %	收率/ %	平均粒径/μm	含湿量（质量分数）/%
1	94.92	81.66	55.66	11.54
2	90.25	79.40	45.21	16.94
3	87.50	75.89	37.29	18.11
4	89.29	76.52	39.51	17.26
5	93.67	78.52	45.99	21.30
6	92.20	77.18	42.72	22.30
7	89.00	75.25	39.37	25.91
8	91.50	80.54	47.52	21.68
9	83.08	68.86	22.10	26.10

实验序号	ρ（聚丙烯酸钠）/ （g·L^-1）	收率/ %	含湿量/ %	平均粒径/μm
1	0.000	75.66	19.54	45.52
2	0.001	79.40	17.94	47.21
3	0.005	80.89	17.11	49.29
4	0.025	88.02	15.25	51.30
5	0.050	81.52	15.02	53.72
6	0.100	72.18	13.30	55.50
7	0.200	70.25	10.02	58.66
8	0.500	68.54	16.68	48.99
9	1.000	65.86	20.10	45.10

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