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Method for extracting lithium carbonate from salt lake brine

A salt lake brine and lithium carbonate technology, applied in the direction of lithium carbonate;/acid carbonate, etc., can solve the problems of unwritten guidance documents and low recovery rate, and achieve easy realization and operation, simple process, Good practicability and economic benefits

Active Publication Date: 2014-09-10
WUXI CITY CHONGAN DISTRICT TECH ENTREPRENEURSHIP SERVICE CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to the existing methods for extracting lithium, the recovery rate obtained is low, and many methods are mostly based on experience, and no written guidance documents have been formed.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1: Take the raw brine, add lime water with the volume ratio of lime water to brine at 100:20 and add lime water for the first step, that is, remove ammonium and magnesium; add mirabilite with the mass ratio of mirabilite to brine A as 100:20 to remove calcium Process: Evaporate and dewater the brine B obtained through the above two steps; freeze, filter, evaporate and concentrate after evaporating to obtain brine E; add oxalic acid to the brine E to perform the decalcification process, oxalic acid and brine E The mass ratio of soda ash to brine F is 100:5; the mass ratio of soda ash to brine F is 100:10. The brine M obtained through the above steps is Lithium-rich brine, then undergoes secondary evaporation to remove water, performs secondary freezing, and filters to obtain coarse salt of lithium carbonate, washes the coarse salt of lithium carbonate containing impurities, and returns to After evaporation and water removal, freezing and filtration are carried ou...

Embodiment 2

[0034] Embodiment 2: Take the raw material brine, add lime water with the volume ratio of lime water to bittern as 100:40 and add lime water to carry out the first step, that is, remove ammonium and magnesium; add mirabilite with the mass ratio of mirabilite and brine A as 100:30 to remove calcium process; carry out the process of evaporating and dehydrating the brine B obtained through the above two steps; after evaporating and dewatering, perform freezing, filtering, and evaporation and concentration to obtain brine E; add oxalic acid to the brine E, and the mass ratio of oxalic acid to brine E is 100 : 8; adding soda ash to brine F obtained after decalcification of oxalic acid, the mass ratio of soda ash to brine F is 100:20. The brine M obtained through the above steps is Lithium-rich brine, then undergoes secondary evaporation to remove water, performs secondary freezing, and filters to obtain coarse salt of lithium carbonate, washes the coarse salt of lithium carbonate co...

Embodiment 3

[0036] Embodiment 3: Take the raw material bittern, add lime water to carry out the first step with the volume ratio of lime water to bittern as 100:45, namely remove ammonium and magnesium; add Glauber's salt to remove calcium with the mass ratio of Glauber's salt and bittern A as 100:35 process; carry out the process of evaporating and dehydrating the brine B obtained through the above two steps; after evaporating and dewatering, perform freezing, filtering, and evaporation and concentration to obtain brine E; add oxalic acid to the brine E, and the mass ratio of oxalic acid to brine E is 100 : 8; adding soda ash to brine F obtained after decalcification of oxalic acid, the mass ratio of soda ash to brine F is 100:20. The brine M obtained through the above steps is Lithium-rich brine, then undergoes secondary evaporation to remove water, performs secondary freezing, and filters to obtain coarse salt of lithium carbonate, washes the coarse salt of lithium carbonate containing ...

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PUM

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Abstract

The invention relates to a method for extracting lithium carbonate from salt lake brine, which comprises the following steps: adding lime water into raw brine to remove ammonium and magnesium; adding mirabilite to remove calcium; dehydrating by evaporation; refrigerating, and filtering; adding oxalic acid to further remove calcium; adding sodium carbonate; and washing with clear water and the like. The method is simple in technique and easy to implement and operate; the whole process can be operated under the conditions of normal temperature and pressure except the refrigeration step, and does not need to add any auxiliary material; and thus, the method has favorable practicality and economic benefit. The method provides instructions for sufficiently developing and utilizing national lithium resources and especially lithium and magnesium resources in salt lake resources in production practice.

Description

technical field [0001] The application relates to the field of chemical technology, in particular to a method for extracting lithium carbonate from salt lake brine. Background technique [0002] Lithium is known as the "energy upstart" in the 21st century. It is the lightest and most active metal element in nature, and it is a new energy raw material. There are many types of lithium products, such as lithium carbonate, lithium chloride, lithium bromide, lithium hydroxide, etc. Lithium carbonate, as the most important kind of lithium products, is widely used in traditional industries such as chemical industry, metallurgy, ceramics, medicine, refrigeration, etc. It can also be used to prepare catalysts for chemical reactions, known as "Dingye MSG". In recent years, with the continuous advancement of science and technology, lithium carbonate has been gradually used in energy, military industry, aerospace and other fields, and is regarded as an important strategic material by m...

Claims

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Application Information

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IPC IPC(8): C01D15/08
Inventor 肖运根陈伟新章隆泉过俊宏顾肖红
Owner WUXI CITY CHONGAN DISTRICT TECH ENTREPRENEURSHIP SERVICE CENT
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