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A kind of method utilizing salt lake brine to produce battery-grade lithium carbonate

A technology of salt lake brine and lithium carbonate, applied in the direction of lithium carbonate;/acid carbonate, etc., can solve the problem of not being suitable for the production of lithium carbonate in brine, to improve the comprehensive utilization rate of resources, low impurity index, and product quality. Stable quality effect

Active Publication Date: 2014-10-22
QINGHAI LITHIUM IND
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  • Abstract
  • Description
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Problems solved by technology

The current "Industrial Grade Lithium Carbonate" (GB / T 11075-2003) national standard and "Battery Grade Lithium Carbonate" (YS / T 582-2006) non-ferrous metallurgy industry standard are drafted on the basis of ore, due to ore and brine The properties of raw materials are completely different, and the standard of ore lithium carbonate is not suitable for the production of brine lithium carbonate

Method used

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  • A kind of method utilizing salt lake brine to produce battery-grade lithium carbonate
  • A kind of method utilizing salt lake brine to produce battery-grade lithium carbonate

Examples

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Effect test

Embodiment 1

[0028] (1) Brine pretreatment: Brine pretreatment: Raw brine contains sediment impurities after being concentrated by natural beaches in salt fields, and the sediment can be removed by using a multi-media filter. At the same time, the iron that affects the separation of magnesium and lithium in the brine is removed Impurities, the filter material of the multimedia filter is composed of manganese sand, quartz sand, and activated carbon in a mass ratio of 1:1:1. The turbidity of the filtered brine is ≤0.5NTU, Fe 2+ Content ≤ 0.1mg / L, adjust its pH value between 3 and 3.5.

[0029] (2) Separation of magnesium and lithium: the selective two-stage magnesium and lithium separation of the raw material brine treated in the step (1) under the action of electric field force, the voltage of the first-level separation is DC120V, the current DA100A, and the voltage of the second-level separation is DC120V, current DA260A, the main composition (g / L) of lithium-rich brine is Mg 1.5, Li 10.0,...

Embodiment 2

[0038] (1) Brine pretreatment: Brine pretreatment: Raw brine contains sediment impurities after being concentrated by natural beaches in salt fields, and the sediment can be removed by using a multi-media filter. At the same time, the iron that affects the separation of magnesium and lithium in the brine is removed Impurities, the filter material of the multimedia filter is composed of manganese sand, quartz sand, and activated carbon in a mass ratio of 1:1:1. The turbidity of the filtered brine is ≤0.5NTU, Fe 2+ Content ≤ 0.1mg / L, adjust its pH value between 3 and 3.5.

[0039] (2) Separation of magnesium and lithium: the selective two-stage magnesium and lithium separation of the raw material brine treated in step (1) under the action of electric field force, the voltage of the first-level separation is DC150V, the current DA150A, and the voltage of the second-level separation is DC135V, current DA290A, the main composition (g / L) of lithium-rich brine is Mg 4.5, Li 11.0, SO ...

Embodiment 3

[0048] (1) Brine pretreatment: Brine pretreatment: Raw brine contains sediment impurities after being concentrated by natural beaches in salt fields, and the sediment can be removed by using a multi-media filter. At the same time, the iron that affects the separation of magnesium and lithium in the brine is removed Impurities, the filter material of the multimedia filter is composed of manganese sand, quartz sand, and activated carbon in a mass ratio of 1:1:1. The turbidity of the filtered brine is ≤0.5NTU, Fe 2+ Content ≤ 0.1mg / L, adjust its pH value between 3 and 3.5.

[0049] (2) Separation of magnesium and lithium: the selective two-stage magnesium and lithium separation of the raw material brine treated in step (1) under the action of electric field force, the voltage of the first-level separation is DC180V, the current DA200A, and the voltage of the second-level separation is DC150V, current DA320A, the main composition (g / L) of lithium-rich brine is Mg10.0, Li 12.0, SO ...

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Abstract

The invention provides a method for preparing battery-level lithium carbonate by using salt lake brine. The method uses salt lake brine in Qinghai as a raw material and uses an ion selectivity separation device to transfer magnesium and lithium ions in the raw material of the brine under the effect of an electric field; when the raw material of the brine passes through a separation membrane with selectivity, monovalent ions, such as the lithium ions and sodium ions can pass through, but divalent ions, such as magnesium ions and calcium ions can be separated, so that lithium-enrichment brine with a low ratio of magnesium to lithium is obtained after the separation; impurities, such as Ca<2+>, K<+>, SO4<2-> and Mg<2+>, in the lithium-enrichment brine with the low ratio of the magnesium to the lithium can be deeply removed; an auxiliary material of a pure alkali solution can be purified; the lithium-enrichment brine after deep removal of the impurities is subjected to three-effect evaporation and concentration after neutralizing with acid; alkali is added into the concentrated lithium-enrichment brine at a certain temperature for lithium sedimentation; and finally, the finished product of the battery-level lithium carbonate can be obtained by drying and cooling after filter press, washing and centrifugal separation washing are carried out. The battery-level lithium carbonate meets the requirements of the local standard DB63 / T1113-2012 (brine battery lithium carbonate) in the Qinghai Province.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical industry, and in particular relates to a method for preparing battery-grade lithium carbonate from salt lake brine. Background technique [0002] Lithium is one of the important strategic resources, known as industrial monosodium glutamate, and has important strategic significance in the national defense industry and national high-tech development. Lithium mainly exists in nature in two forms of solid ore and liquid ore, among which lithium reserves in salt lake brine account for about 66% of the world. Globally, the high cost of ore lithium carbonate mining has been gradually abandoned, and brine lithium carbonate is currently the main production process, and about 80% of the world's lithium carbonate is produced from brine. my country is rich in lithium ore resources, and its reserves rank among the top in the world along with Chile and Bolivia in South America. It is the general tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D15/08
Inventor 马培华李增荣李健周晓军刘国旺赵颖唐发满马军
Owner QINGHAI LITHIUM IND
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