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Method for preparing lithium salts from lithium extracted from spodumene

A spodumene and lithium extraction technology, applied in chemical instruments and methods, lithium halide, lithium nitrate and other directions, can solve the problems of long process flow and high production cost, and achieve the advantages of shortening the process flow, low production cost and simplifying operation steps. Effect

Inactive Publication Date: 2012-11-07
GANFENG LITHIUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional sulfuric acid method generally prepares lithium sulfate first, and then prepares lithium carbonate or lithium hydroxide through transformation, and then transforms lithium salts based on lithium carbonate or lithium hydroxide to prepare other lithium salts, such as using lithium carbonate plus hydrochloric acid to prepare anhydrous Lithium chloride and nitric acid are added to prepare anhydrous lithium nitrate. Traditionally, spodumene is used to prepare anhydrous lithium chloride and anhydrous lithium nitrate. The process is relatively long and the production cost is relatively high.

Method used

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  • Method for preparing lithium salts from lithium extracted from spodumene
  • Method for preparing lithium salts from lithium extracted from spodumene
  • Method for preparing lithium salts from lithium extracted from spodumene

Examples

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Effect test

Embodiment 1

[0065] a. Transformation roasting: 1000Kg spodumene ore (Li 2 O·Al 2 o 3 4SiO2 2 ) is placed in an internally heated rotary furnace, and undergoes transformation roasting under high temperature conditions, and the roasting temperature is controlled at 1250°C to make it transform from α type to β type;

[0066] B, cooling ball milling: the raw material after the roasting of step a is cooled to normal temperature, then it is ball milled to 325 orders, obtains 999Kg lithium stone ore, analyzes Li in the spodumene after ball milling 2 O content is 6.1%;

[0067] c. Acidification and roasting: Blend concentrated sulfuric acid with a mass concentration of 95% and spodumene ground into step b to form a slurry, with an excess of 20% concentrated sulfuric acid (that is, the material-acid ratio is 4.01), and then place it in a rotary kiln for roasting , the roasting temperature is controlled at 280°C, and the roasting time is 60 minutes;

[0068] d. Slurry neutralization: Add the w...

Embodiment 2

[0079] a. Transformation roasting: 1000Kg spodumene ore (Li 2 O·Al 2 o 3 4SiO2 2 ) is placed in an internal heating rotary furnace, and undergoes transformation roasting under high temperature conditions, and the roasting temperature is controlled at 1150°C to make it transform from α type to β type;

[0080] B, cooling ball milling: the raw material after the roasting of step a is cooled to normal temperature, then it is ball milled to 50 orders, obtains 999Kg lithium stone ore, analyzes Li in the spodumene after ball milling 2 O content is 5.56%;

[0081]c. Acidification roasting: blend concentrated sulfuric acid with a mass concentration of 98% and finely ground spodumene in step b to form a slurry, with an excess of 40% concentrated sulfuric acid (that is, the material-acid ratio is 3.89), and then place it in a rotary kiln for roasting , the roasting temperature is controlled at 250°C, and the roasting time is 30 minutes;

[0082] d. Slurry neutralization: Add the wa...

Embodiment 3

[0093] a. Transformation roasting: 1000Kg spodumene ore (Li 2 O·Al 2 o 3 4SiO2 2 ) is placed in an internally heated rotary furnace, and undergoes transformation roasting under high temperature conditions, and the roasting temperature is controlled at 1200°C to make it transform from α type to β type;

[0094] B, cooling ball milling: the raw material after the roasting of step a is cooled to normal temperature, then it is ball milled to 200 orders, obtains 999Kg lithium stone ore, analyzes Li in the spodumene after ball milling 2 O content is 6.07%;

[0095] c. Acidification and roasting: blend concentrated sulfuric acid with a mass concentration of 97% and spodumene ground into step b to form a slurry, with an excess of 25% concentrated sulfuric acid (that is, the ratio of material to acid is 3.95), and then place it in a rotary kiln for roasting , the roasting temperature is controlled at 265°C, and the roasting time is 45 minutes;

[0096] d. Slurry neutralization: Ad...

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Abstract

The invention discloses a method for preparing lithium salts from lithium extracted from spodumene, which comprises the following steps: a. transforming and roasting; b. cooling and ball milling; c. acidifying and roasting; d. slurrying and neutralizing; e. separating, washing and purifying; f. blending and transforming; g. filtering and washing; h. deep impurity removing; i. neutralizing; j. concentrating and crystallizing; k. cooling to precipitate sodium; l. concentrating and crystallizing; and m. separating and drying. The method disclosed by the invention has the advantages of short technical process, low energy consumption, simple operation steps, low production cost and high resource utilization ratio.

Description

technical field [0001] The invention relates to a preparation method of lithium salt, in particular to a method for preparing lithium salt by extracting lithium from spodumene. Background technique [0002] Industrial lithium metal smelting methods are mainly divided into two categories: one is to extract lithium from brine, enrich lithium in brine, and finally transform to produce lithium salt products such as lithium hydroxide monohydrate, lithium carbonate, and lithium sulfate; The method is to extract lithium from the ore, mainly by fire or wet treatment of the lithium-containing ore-spodumene and lepidolite, destroying its original gangue structure, and making the Li in it 2 O is dissolved in the form of soluble lithium salts, and lithium salts such as lithium hydroxide monohydrate, lithium carbonate, and lithium sulfate can be obtained. However, because most of domestic salt lake brines have the characteristics of low magnesium-lithium ratio, it is difficult to develo...

Claims

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Application Information

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IPC IPC(8): C01D15/00C01D15/04C01D15/10
Inventor 李良彬袁中强罗光华彭爱平刘明李广梅陈亮
Owner GANFENG LITHIUM CO LTD
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