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Method for extracting lithium from primary lithium-extraction solution of lithium ores

A lithium solution and lithium extraction technology, which is applied in the field of lithium extraction from lithium ore, can solve the problems of large material flow, high product cost, and low lithium recovery rate, and achieve the effects of low energy consumption, reliable operation, and cost reduction

Active Publication Date: 2013-05-22
宁波圣岛新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The limestone sintering method has large material circulation, high energy consumption, low lithium recovery rate and high product cost
[0003] The sulfuric acid method is a traditional production process. First, it is roasted at high temperature, and then the roasted product is soaked with water. The obtained sulfuric acid solution is treated with lime and soda ash to remove magnesium and calcium, and then lithium is precipitated with carbonate. The high energy consumption is challenged.

Method used

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  • Method for extracting lithium from primary lithium-extraction solution of lithium ores

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Step 1: 5000ml of the primary lithium extraction solution obtained from the treatment of lepidolite with sulfuric acid is not processed for future use.

[0074] Step 2: Make the flat nanofiltration membrane of aromatic polyamide into roll-type nanofiltration membrane element, and form a single-stage nanofiltration equipment with security filter, raw water pump, high-pressure pump, raw solution tank and product solution tank.

[0075] Step 3: Pass the primary lithium extraction solution through the nanofiltration equipment, under the operating pressure of 0.6MPa, separate and filter monovalent and multivalent cations, test the ICP of the monovalent and multivalent salt solutions obtained in this example, and analyze , It is estimated that the transmittance of Li and other ions is less than 1%, and effective separation of Li from Ca, Mg and Al cannot be achieved.

[0076] Step 4: Treat the concentrated solution with alkali, and Li, Ca, Mg and Al precipitate together and c...

Embodiment 2

[0078] Step 1: Add 5000ml of the primary lithium extraction solution obtained from lepidolite into 700g of calcium chloride, stir to dissolve the calcium chloride at room temperature, then let it stand for 24 hours for precipitation, and centrifuge at a speed of 5000 rpm for 4 minutes. , filtered to remove most of the CaSO 4 , to obtain a secondary lithium extraction solution with a pH value of 3;

[0079] Step 2: Make the flat nanofiltration membrane of aromatic polyamide into roll-type nanofiltration membrane element, and form a single-stage nanofiltration equipment with security filter, raw water pump, high-pressure pump, raw solution tank and product solution tank.

[0080] Step 3: The secondary lithium extraction solution is passed through nanofiltration equipment, and the monovalent and multivalent cations are separated and filtered under an operating pressure of 0.6 MPa to separate and obtain Li-containing monovalent cation chloride salt solution. The monovalent and mu...

Embodiment 3

[0085] Step 1: Add 8000ml of the primary lithium extraction solution obtained from spodumene to 1500g of barium chloride, stir and dissolve the barium chloride at room temperature, and then let it stand for 24 hours to precipitate, at a speed of 4000 rpm, 10 minutes at a time of rotation Centrifuge and filter to remove most of the BaSO 4 , to obtain a secondary lithium extraction solution with a pH value of 4;

[0086] Step 2: The tubular nanofiltration membrane of cellulose acetate is made into a tubular nanofiltration membrane element, and a two-stage nanofiltration equipment is composed of a security filter, a raw water pump, a high-pressure pump, a raw liquid tank and a liquid production tank.

[0087] Step 3: The secondary lithium extraction solution is passed through nanofiltration equipment, and the monovalent and multivalent cations are separated and filtered under an operating pressure of 0.8 MPa to separate and obtain Li-containing monovalent cation chloride salt sol...

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Abstract

The invention relates to a method for extracting lithium from a primary lithium-extraction solution of lithium ores. The method comprises the following steps: (a) mixing inorganic salt with the primary lithium-extraction solution, removing the precipitates to obtain secondary lithium-extraction solution; (b) carrying out nanofiltration treatment on the secondary lithium-extraction solution, separating mono-valent cation salt solution from multi-valent cation salt solution; and (c) extracting lithium salt from the mono-valent cation salt solution. Other mono-valent and multi-valent salt separation solutions can be concentrated, crystallized or precipitated to obtain the corresponding salts. The invention provides a novel technology which is used for effectively recycling lithium from the lithium ores; the material resource storage capacity is abundant, the process flow is simple and reasonable, the operation is reliable and the energy consumption is low, so that the purpose of reducing the cost and the energy consumption is achieved.

Description

technical field [0001] The invention relates to a method for extracting lithium from lithium ore, in particular to a method for separating magnesium and aluminum and enriching lithium from the primary sulfuric acid leaching solution of lithium ore. Background technique [0002] my country's current lithium industry is mainly based on lithium ore processing, and lithium is mainly extracted from spodumene and lepidolite. Lithium extraction from lithium ore has a long history and has been continuously innovated in its development. The technology is divided into two categories: alkaline method and acid method. Alkali methods include limestone sintering method and soda ash pressure cooking method; acid methods include sulfuric acid method, sodium acetate method and chloride method, among which limestone sintering method and sulfuric acid method are the main means for lithium extraction from lithium ore. The limestone sintering method has large material circulation, high energy c...

Claims

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Application Information

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IPC IPC(8): C22B26/12C22B3/22
CPCY02P10/20
Inventor 薛立新赵秀兰纪晓声潘惠凯刘义平
Owner 宁波圣岛新材料有限公司
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