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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  • Abstract
  • Description
  • Claims
  • Application Information

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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,

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

Example Embodiment

[0072] Example 1

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

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

[0075] Step 3: Pass the primary lithium extraction solution through a nanofiltration device, and perform separation and filtration of monovalent and multivalent cations at an operating pressure of 0.6 MPa, and test the ICP and analyze the monovalent and multivalent salt solutions obtained in this example , It is estimated that the transmittance of Li other ions is less than 1%, which cannot achieve effective separation of Li from Ca, Mg and Al.

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

Example Embodiment

[0077] Example 2

[0078] Step 1: Add 700 g of calcium chloride to 5000ml of a lithium extraction solution obtained from lepidolite, stir to dissolve calcium chloride at room temperature, and then stand for 24h for precipitation, centrifuge at 5000rpm for 4min , Filter to remove most of CaSO 4 To obtain a secondary lithium extraction solution with a pH of 3;

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

[0080] Step 3: Pass the secondary lithium extraction solution through a nanofiltration device, and perform separation and filtration of monovalent and multivalent cations at an operating pressure of 0.6 MPa to obtain a monovalent cation chloride salt solution containing Li. The monovalent and polyvalent salt solutions obtained in this example were tested for I...

Example Embodiment

[0084] Example 3

[0085] Step 1: Add 1500g of barium chloride to 8000ml of lithium extraction solution from the spodumene, stir to dissolve the barium chloride at room temperature, and then let it stand for 24h for precipitation, at a speed of 4000 revolutions / min and a revolution time of 10 minutes Centrifuge and filter to remove most of BaSO 4 To obtain a secondary lithium extraction solution with a pH of 4;

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

[0087] Step 3: Pass the secondary lithium extraction solution through a nanofiltration device, and perform separation and filtration of monovalent and multivalent cations at an operating pressure of 0.8 MPa to obtain a monovalent cation chloride salt solution containing Li. The monovalent and multival...

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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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