苛化提纯盐湖锂矿回收含氟碳酸锂的研究

doi:10.11962/1006-4990.2019-0451

Abstract

Abstract:

A method of purifying salt lake lithium ore and recovering fluorine-containing lithium carbonate was mainly described.The process flow was as follows：the salt lake lithium ore（fluorine-containing lithium carbonate） was washed by water to remove most of the soluble impurities contained in it,and then it was put into the lime milk slurry for heating to 90~95 ℃ according to a certain proportion.Then it was filtered to obtain the lithium hydroxide solution after 4 h of reaction.The lithium hydroxide solution was pressurized and concentrated at 100~120 ℃ for 4 h to obtain lithium hydroxide solution with low content of calcium-and-magnesium ions and silicate.Food grade carbon dioxide was passed into the refined lithium hydroxide solution and the industrial-grade lithium carbonate was obtained,or preparing lithium hydroxide by concentration.The lithium hydroxide obtained by procedures above can be used to obtain high-purity lithium carbonate with silicon content less than 10×10^-6 through secondary carbonization,cation exchange resin to remove calcium and magnesium ions and recrystallization.The lithium hydroxide can also be used to obtain lithium hydroxide monohydrate with calcium content less than 5×10^-6and magnesium content less than 2×10^-6 through concentration.

Key words: causticization, salt lake lithium ore, cation exchange resin, lithium carbonate

CLC Number:

TQ131.11

Xu Xinfang,Zhou Xiaoping,Liu Zhengfeng,Li Lei,Chen Hu,Li Changming. Study on causticization and purification of salt lake lithium ore and recovery of fluorine-containing lithium carbonate[J]. Inorganic Chemicals Industry, 2020, 52(7): 62-65.

Figures/Tables 13

References 17

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分析元素	w （K）	w （Na）	w （Ca）	w （Mg）	w （Fe）	w（SO₄^2-）	w （Si）
实验1	179.1	663.1	1.3	0.07	0.1	193.0	92.1
实验1	155.0	650.7	0.7	0.04	0.2	203.7	95.2
实验2	494.7	1 802.1	1.4	0.08	0.2	493.9	18.0
实验2	568.1	1 804.0	1.08	0.7	0.1	598.8	10.7
实验3	129.4	896.7	14.0	0.2	0.4	930.6	12.9
实验3	180.9	779.3	11.6	0.08	1.3	1 263.0	23.9

分析元素	w （K）	w （Na）	w （Ca）	w （Mg）	w （Fe）	w（SO₄^2-）	w （Si）
实验1	63.6	783.7	176.8	28.9	0.6	409.4	728.15
实验1	51.3	55.0	191.3	1.4	1.7	120.2	464.52
实验2	38.5	50.0	67.4	0.2	0.3	929.4	158.4
实验2	32.8	38.1	66.4	0.1	0.1	512.3	166.7
实验3	14.2	20.3	216.5	0.4	0.08	962.5	116.3
实验3	17.1	22.4	157.1	0.5	0.1	1 082.0	109.6

分析元素	w （K）	w （Na）	w （Ca）	w （Mg）	w （Fe）	w（SO₄^2-）	w （Si）
实验1	1.9	0.06	1.3	1.8	0.6	7.8	52.96
实验1	6.8	0.3	2.1	2.4	1.1	10.2	67.05
实验2	3.0	2.3	0.5	0.6	0.3	9.1	4.3
实验2	0.5	4.7	0.6	0.6	0.4	11.4	2.8
实验3	0.6	0.2	2.2	1.8	0.6	14.4	4.4
实验3	0.2	0.3	1.8	2.9	0.3	20.7	4.9

分析元素	w （K）	w （Na）	w （Ca）	w （Mg）	w （Fe）	w （SO₄^2-）	w （Si）	w （Cl）
LiOH- H₂O-T1	≤10	≤20	≤150	—	≤8	≤100	—	≤20
LiOH- H₂O-T2	≤500	≤500	≤250	—	≤20	≤300	—	≤300
单水氢氧化锂	33.1	117.1	3.4	1.1	3.3	120.1	385.3	38.5
	54.0	205	3.8	0.2	0.1	135.8	375.2	91.6
	64.3	151	6.7	0.5	1.5	196.4	415.6	98.9

分析元素	w （K）	w （Na）	w （Ca）	w （Mg）	w （Fe）	w （SO₄^2-）	w （Si）	w （Cl）
浓缩滤液	3 032.0	9 626.0	4.5	0.02	0.7	2 786.0	26.4	7 960.0
浓缩滤液	3 231.0	12 560.0	8.5	0.02	1.1	2 800.0	35.5	17 000.0
工业级碳酸锂	203.5	309.2	101.4	0.3	1.3	701.8	32.6	22.4
工业级碳酸锂	206.8	242.6	172.0	0.5	0.4	871.6	105.0	295.7
高纯碳酸锂	3.5	4.1	2.7	0.3	0.5	52.6	10.0	27.8
高纯碳酸锂	2.4	5.0	3.6	0.2	0.9	258.0	7.1	31.2

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on causticization and purification of salt lake lithium ore and recovery of fluorine-containing lithium carbonate

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