Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Preparation method for high-purity submicron lithium carbonate

A sub-micron, lithium carbonate technology, applied in lithium carbonate;/acid carbonate and other directions, can solve the problems of large application limitations of production technology, high process energy consumption, long process duration, etc., to ensure The effect of high purity requirements, improving conversion efficiency and reducing production costs

Active Publication Date: 2016-03-16
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
View PDF4 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 1. Using common methods to complete carbonization to prepare lithium bicarbonate solution, the process takes a long time and has low efficiency
2. To prepare lithium carbonate by pyrolyzing lithium bicarbonate feed liquid, the feed liquid needs to be heated at a constant speed (heating rate is 0.5-1°C / min), heated to 70-90°C, the process consumes a lot of energy, is difficult to control, and the process lasts for a long time long
3. The ion exchange method is used to remove impurities. The ion exchange process does not remove boron in a targeted manner, and boron is a very critical factor affecting the application of lithium carbonate products in battery materials. If the content of boron in raw materials (such as industrial grade lithium carbonate) When it is high, boron cannot be effectively removed by existing technology, which will affect its application as a lithium battery material
The main shortcoming of this prior art has: 1 has special requirement (lithium is soluble lithium salt or soluble lithium hydroxide etc.) to the character of raw material lithium, can not solve the problem that insoluble lithium salt is raw material preparation nano lithium carbonate
Make the application of production technology more limited
2. The dispersant used in the prior art is expensive and the production cost is higher
3 The use of existing technology can only guarantee the standard of lithium carbonate, but cannot meet the product purity of lithium carbonate

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method for high-purity submicron lithium carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] Hereinafter, embodiments of the present invention will be described in detail. This invention may, however, be embodied in many different forms and should not be construed as limited to the specific embodiments set forth herein. Rather, the embodiments are provided to explain the principles of the invention and its practical application, thereby enabling others skilled in the art to understand the invention for various embodiments and with various modifications as are suited to particular intended uses.

[0023] The invention uses lithium carbonate crude product slurry as a raw material, prepares lithium bicarbonate feed solution through supergravity technology, and then obtains submicron high-purity lithium carbonate through supergravity technology. Through the investigation of three factors such as the concentration of the dispersion liquid, the feed rate, and the speed of the high-speed rotating packed bed in the lithium carbonate precipitation step, a rapid and effi...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to the technical field of chemical separation and purification, especially to a preparation method for high-purity submicron lithium carbonate. The preparation method comprises the following steps: dissolving a crude lithium carbonate product in high-purity water to prepare lithium carbonate slurry; allowing the lithium carbonate slurry to enter a rotary packed bed and introducing CO2 gas into the rotary packed bed so as to prepare lithium bicarbonate liquid; allowing the lithium carbonate liquid to successively pass through a pretreated calcium-magnesium ion exchange resin apparatus and boron ion exchange resin apparatus so as to allow a second solution to be formed after removal of impurities containing calcium, magnesium and boron in the lithium bicarbonate liquid; uniformly mixing the second solution with a dispersant so as to form a third solution and adding the third solution into the rotary packed bed for a reaction so as to produce lithium carbonate precipitate; and drying the lithium carbonate precipitate so as to obtain a high-purity submicron lithium carbonate product. The preparation method employs crude lithium carbonate of the lithium salt industry as a raw material for preparation of the high-purity submicron lithium carbonate; and the raw material is more widely and easily available and cost for the raw material is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of chemical separation and purification, in particular to a method for preparing high-purity submicron lithium carbonate. Background technique [0002] The preparation of high-purity lithium carbonate usually takes lithium carbonate crude product slurry as raw material, by introducing CO into it 2 A carbonization reaction occurs to obtain a lithium bicarbonate feed solution, which is then subjected to an ion exchange resin removal step, and then a high-purity lithium carbonate product is obtained through a pyrolysis reaction. Therefore, the preparation of lithium bicarbonate feed solution is a necessary process for the preparation of high-purity lithium carbonate. How to improve the conversion efficiency of crude lithium carbonate to lithium bicarbonate process, and shorten this conversion time is a subject that must be considered in the preparation of lithium bicarbonate feed liquid. [0003] In Dai Zhife...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08
CPCC01D15/08C01P2004/62
Inventor 卿彬菊邓小川霍闪温现明朱朝梁史一飞邵斐黄泽洲唐志雷雷风鹏
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products