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System and method for preparing battery-grade lithium carbonate

A lithium carbonate, battery-grade technology, applied in the field of resource recovery and utilization, can solve the problem that waste resources cannot be recycled and reused, and achieve the effects of efficient recovery, avoidance of waste resources, and high preparation purity

Pending Publication Date: 2018-06-29
KEDA (ANHUI) NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem that waste resources cannot be recycled and utilized in the existing battery-grade lithium carbonate preparation process, the present invention provides a system and method for preparing battery-grade lithium carbonate

Method used

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  • System and method for preparing battery-grade lithium carbonate
  • System and method for preparing battery-grade lithium carbonate

Examples

Experimental program
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Effect test

Embodiment 1

[0052] Such as figure 1 As shown, the system for preparing battery-grade lithium carbonate in this embodiment includes pulping equipment, carbonization equipment, pyrolysis equipment, filtration equipment, acidification equipment, concentration equipment, impurity removal equipment, lithium sinking equipment and electrolysis equipment;

[0053]The slurry mixing equipment, the carbonization equipment, the pyrolysis equipment and the filtering equipment are connected in sequence to perform slurry mixing, carbonization, pyrolysis and filtration respectively, and the slurry mixing equipment is provided with a raw material inlet; the carbonization equipment After passing through the first solid-liquid separation equipment, it is respectively connected with the pyrolysis equipment and the acidification equipment for pyrolysis and acidification, and the carbonization equipment performs solid-liquid separation through the first solid-liquid separation equipment; Acidification equipmen...

Embodiment 2

[0060] Such as figure 1 Shown, the system for preparing battery-grade lithium carbonate of the present embodiment, on the basis of embodiment 1,

[0061] The slurry mixing equipment is a slurry mixing tank, the carbonization equipment is a carbonization tower, and a slurry tank is arranged between the slurry mixing tank and the carbonization tower; the first solid-liquid separation equipment is a centrifuge; the pyrolysis equipment is Decomposition tower, a clear liquid tank is provided between the first solid-liquid separation equipment and the pyrolysis equipment; the filtration equipment is an ultrafiltration membrane machine or a reverse osmosis membrane machine, and the filtration equipment passes through drying equipment and crushing equipment The lithium carbonate wet material produced by the filter equipment can be dried and pulverized to produce the finished battery grade lithium carbonate.

[0062] In this embodiment, a slurry tank is provided between the slurry tan...

Embodiment 3

[0064] Such as figure 1 As shown, the system for preparing battery-grade lithium carbonate of the present embodiment, on the basis of embodiment 1 or 2, the drying equipment is a disc dryer or a belt dryer, and the pulverizing equipment is a jet mill or a hammer The grinding process of these two machines does not require any solid grinding media, which can ensure the purity of lithium carbonate. Among them, the jet mill can automatically classify lithium carbonate solid particles, so that the particle size of lithium carbonate solid particles is relatively uniform; The filtration equipment and the first solid-liquid separation equipment are connected to the acidification equipment through a mother liquor tank; The concentration equipment is a combination of ultrafiltration membrane machine and reverse osmosis membrane machine. The principle is to use ultrafiltration membrane machine to remove macromolecular impurities first, and then use reverse osmosis membrane machine to pre...

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Abstract

The invention discloses a system and method for preparing battery-grade lithium carbonate, belongs to the field of resource recycling and aims to solve the problem that waste resources generated in the conventional battery-grade lithium carbonate preparation process cannot be recycled or reused. According to the system and the method, filtrate generated from solid-liquid separation and separationmother liquor generated from filtration are subjected to acidification, concentration, decontamination and lithium settlement in acidification equipment, concentration equipment, decontamination equipment and lithium settlement equipment, the water outlet of the concentration equipment is connected with the raw material inlet of pulping equipment, the carbon dioxide outlet of pyrolysis equipment is connected with the carbon dioxide inlet of carbonization equipment and the carbon dioxide inlet of the lithium settlement equipment, and the sulfuric acid outlet of electrolysis equipment is connected with the sulfuric inlet of the acidification equipment. By adopting the system and the method, waste resources generated in the battery-grade lithium carbonate preparation process can be recycled and reused.

Description

technical field [0001] The invention belongs to the field of resource recovery and utilization, and in particular relates to a system and method for preparing battery-grade lithium carbonate. Background technique [0002] As the main raw material for preparing other lithium salts, lithium carbonate is an important basic lithium salt. It has been widely used in the aluminum smelting, glass and ceramic industries for a long time, and is now widely used in lithium-ion batteries and pharmaceutical industries. In the lithium battery industry, positive electrode materials such as lithium cobaltate, lithium nickelate, and lithium manganate are mostly prepared from lithium carbonate. Due to the limitations of production technology and salt lake brine itself, most of the primary products are industrial-grade lithium carbonate with low cost and large output. It is the most economical method to directly prepare battery-grade lithium carbonate from industrial-grade lithium carbonate as ...

Claims

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Application Information

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IPC IPC(8): C01D15/08C25B1/16C25B1/22
CPCC25B1/16C25B1/22C01D15/08C01P2006/80
Inventor 李鹏程邵如意毕大鹏刘云芳王冰宇潘峰
Owner KEDA (ANHUI) NEW MATERIAL CO LTD
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