Industrial method for producing battery-grade lithium carbonate or high-purity lithium carbonate

A technology of high-purity lithium carbonate and lithium carbonate, which is applied in the direction of lithium carbonate; The effect of consumption

Active Publication Date: 2012-07-18
四川长和华锂科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The literature reports on the preparation of high-purity lithium carbonate by the existing carbo

Method used

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  • Industrial method for producing battery-grade lithium carbonate or high-purity lithium carbonate
  • Industrial method for producing battery-grade lithium carbonate or high-purity lithium carbonate
  • Industrial method for producing battery-grade lithium carbonate or high-purity lithium carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Embodiment 1 adopts the industrialized method of directly producing battery-grade lithium carbonate by carbonate type salt lake lithium concentrate

[0055] according to figure 1 Shown technological process, prepares battery-grade lithium carbonate:

[0056] (1), grinding

[0057] ① Take carbonate-type salt lake lithium concentrate (such as Tibetan carbonate-type salt lake lithium concentrate). This type of lithium concentrate can be obtained through purchase, or can be obtained by extracting lithium resources in salt lake brine by conventional processes.

[0058] The chemical composition of the lithium ore:

[0059] Li 2 O: 10.0-30.0% Na + : 5.0~16.5%K + : 2.6~4.0%

[0060] CO 3 2- : 8.0~56.0% Cl - : 8.0~11.0% SO 4 2- : 1.5~4.0%

[0061] Ca 2+ : 0.4~1.5% Mg 2+ : 0.4~5.0%

[0062] ②coarse crushing: directly crush the material with a particle size of ≤5mm;

[0063] ③Drying Drying temperature≤350℃, material moisture≤3%;

[0064] ④Fine Grinding Use ultra-...

Embodiment 2

[0096] Embodiment 2 adopts the industrialized method of carbonate type salt lake lithium concentrate to directly produce high-purity lithium carbonate

[0097] With reference to the method of Example 1, first prepare a Li 2 CO 3 wet boutique Then carry out the second carbonization, the steps are as follows:

[0098] 1. Secondary carbonization

[0099] Secondary hydrogenation to take Li once 2 CO 3 wet boutique Add pure water, Li 2 CO 3 mother liquor or washing water The secondary hydrogenation is carried out in one or several mixed liquids, the specific method and conditions are the same as the primary hydrogenation

[0100] Secondary impurity removal Add lithium salt of ethylenediaminetetraacetate, oxalic acid, lithium oxalate, phosphoric acid, lithium phosphate, lithium dihydrogen phosphate, etc. for impurity removal, filtration, precipitation Mainly incompletely reacted Li 2 CO 3 And a small amount of slag left by the impurity removal, the precipitat...

Embodiment 3

[0116] Embodiment 3 adopts technical grade lithium carbonate or its product to prepare the industrialized method of battery grade lithium carbonate

[0117] according to figure 1 Shown technological process, prepares battery-grade lithium carbonate:

[0118] 1 primary carbonization

[0119] Primary hydrogenation: get technical grade lithium carbonate or its product (Li 2 O: 38.0~40.3%), add pure water, Li 2CO 3 wash water or Li 2 CO 3 mother liquor In one or several mixed liquids, the feeding amount of lithium-containing solid ⑨ is 3000kg~6000kg, and the amount of liquid added is 50~100m 3 , in the hydrogenation reactor provided by the present invention (the hydrogenation reactor sees embodiment 3), airtightly feeds CO 2 , the temperature is ≤25°C, the time is 1~2h, the pressure is 0.2~0.3MPa, the end point is based on the pH of the hydrogenation solution 7.0~8.5, the flow rate of the material in the circulation pipe is 3~5m / s, and each kettle can prepare hydrogen...

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Abstract

The invention provides an industrial method for producing battery-grade lithium carbonate or high-purity lithium carbonate. The industrial method comprises the following steps of: carbonizing; placing a carbonate-type lithium source in a hydriding reaction kettle for one time or more than two times of carbonization to obtain a wet lithium carbonate product, wherein the content of Li2O in the lithium source is 5.0-40.3% (w/w); and drying the wet lithium carbonate product obtained by one-time carbonization, thus obtaining battery-grade lithium carbonate; or drying the wet lithium carbonate product obtained by more than two times of carbonization, thus obtaining high-purity lithium carbonate. The method provided by the invention can continuously produce battery-grade lithium carbonate or high-purity lithium carbonate on large scale, is low in energy consumption and environmentally friendly and has strong practical value.

Description

technical field [0001] The invention relates to a method for preparing high-purity lithium carbonate, in particular to a method for industrially producing high-purity lithium carbonate and battery-grade lithium carbonate. Background technique [0002] Lithium is the lightest known silver-white alkali metal with the smallest nucleus radius. Because lithium and its compounds have many unique and excellent properties, they are widely used in glass, ceramics, lubrication, electronics, metallurgy, medicine, refrigeration, aerospace, etc. field. With the rising demand for clean energy, lithium energy may have a profound impact on human life, and it is also known as "the energy upstart of the 21st century". [0003] Lithium carbonate is an important lithium salt with a wide range of uses and strong market application value. According to GB / T 11075-2003, GB 10576-89, YS / T 582-2006 and other relevant national and industry standards, lithium carbonate can be divided into four grades...

Claims

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Application Information

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IPC IPC(8): C01D15/08
Inventor 苏康杜洪文向东
Owner 四川长和华锂科技有限公司
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