Unlock instant, AI-driven research and patent intelligence for your innovation.

Technology for producing anhydrous lithium chloride by crystallization method

A technology of lithium chloride and crystallization, applied in the direction of lithium halide, etc., can solve the problems of high production cost, long impurity removal process, unsafe production, etc., and achieve the effect of low production cost, high purity, and simple impurity removal process

Active Publication Date: 2019-02-01
天齐锂业(射洪)有限公司
View PDF10 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a process for producing anhydrous lithium chloride by a crystallization method, which solves the problems of long impurity removal process at the front end and high production cost of the existing lithium chloride crystallization process, and barium chloride is usually introduced to remove sulfate radicals. A highly toxic chemical, the problem of unsafe production

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
  • Technology for producing anhydrous lithium chloride by crystallization method
  • Technology for producing anhydrous lithium chloride by crystallization method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: A process for producing anhydrous lithium chloride by crystallization

[0032] It includes the following steps in sequence: (1) After the spodumene is roasted and refined, acidified, leached, and squeezed to obtain Li 2 100L of leachate containing lithium sulfate with an O concentration of 15 g / L;

[0033] (2) Add 5.82 kg of calcium chloride solids to the above-mentioned leaching solution, transform and react for half an hour, and then press and filter;

[0034] (3) The squeezed filtrate obtained in the previous step is heated and evaporated to 130°C, until Li 2 O concentration is 198 g / L, filter while hot;

[0035] (4) Cool the filtrate obtained in the previous step to 30°C, and then filter to obtain the impurity precipitation filter residue and the impurity precipitation filtrate, and then use the normal temperature saturated sodium chloride solution to wash the impurity precipitation filter residue; the washing water obtained from washing the impurity filter residu...

Embodiment 2

[0039] Example 2: A process for producing anhydrous lithium chloride by crystallization

[0040] It includes the following steps in sequence: (1) After the spodumene is roasted and refined, acidified, leached, and squeezed to obtain Li 2 100L of leachate containing lithium sulfate with an O concentration of 20 g / L;

[0041] (2) Add 8.14 kg of calcium chloride solids to the above-mentioned leaching solution, transform and react for half an hour, and then press and filter;

[0042] (3) Heat and evaporate the squeezed filtrate obtained in the previous step to 139℃, until Li 2 O concentration is 218 g / L, filter while hot;

[0043] (4) Cool the filtrate obtained in the previous step to 40°C, then filter to obtain the impurity precipitation filter residue and the impurity precipitation filtrate, and then wash the impurity precipitation filter residue with a saturated sodium chloride solution at room temperature; the washing water obtained from washing the impurity filter residue returns to s...

Embodiment 3

[0047] Example 3: A process for producing anhydrous lithium chloride by crystallization

[0048] It includes the following steps in sequence: (1) After the spodumene is roasted and refined, acidified, leached, and squeezed to obtain Li 2 100L of leachate containing lithium sulfate with an O concentration of 20 g / L;

[0049] (2) Add 7.99 kg of calcium chloride solids to the above-mentioned leaching solution, transform and react for half an hour, and then press and filter;

[0050] (3) Heat and evaporate the squeezed filtrate obtained in the previous step to 133°C until 2 O concentration is 203 g / L, filter while hot;

[0051] (4) Cool the filtrate obtained in the previous step to 35°C, and then filter to obtain the impurity precipitation filter residue and the impurity precipitation filtrate, and then use the normal temperature saturated sodium chloride solution to wash the impurity precipitation filter residue; the washing water obtained from washing the impurity filter residue returns ...

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

A technology for producing anhydrous lithium chloride by a crystallization method is characterized by successively comprising the following steps: carrying out roasting, acidification, pulping and pressing on lithium-containing mineral to obtain a lithium sulfate-containing leaching solution; adding calcium chloride for conversion, press-filtering to obtain a press filtrate; carrying out evaporation and concentration on the press filtrate, cooling and filtering to obtain precipitated residue and a precipitated filtrate; carrying out evaporation and concentration on the precipitated filtrate until a solid is precipitated, carrying out thermal centrifugal separation to obtain a primary centrifugal mother liquor and a primary centrifugal wet material; returning the primary centrifugal motherliquor to the cooling section; dissolving the primary centrifugal wet material and then filtering, heating the filtrate for evaporation and concentration until a solid is precipitated, and carrying out thermal centrifugal separation to obtain a secondary centrifugal mother liquor and a secondary centrifugal wet material; heating the secondary centrifugal mother liquor for evaporation and concentration until a solid is precipitated, and drying the secondary centrifugal wet material to obtain the anhydrous lithium chloride product. Without the need of adding barium chloride and carbonate duringthe whole process, the impurity removal process is simple, the cost is low, and the purity of anhydrous lithium chloride is high.

Description

Technical field [0001] The invention relates to the preparation field of anhydrous lithium chloride, in particular to a process for producing anhydrous lithium chloride by a crystallization method. Background technique [0002] Anhydrous lithium chloride is mainly used in the production of electrolytic lithium metal. The existing production methods of anhydrous lithium chloride mainly fall into two categories: spray drying and crystallization. No matter which method is adopted, a suitable one must be prepared in the early stage. Lithium chloride solution. In order to prepare a suitable lithium chloride solution, it is necessary to remove impurities from the lithium chloride solution so that the impurity content can meet the requirements of spray drying and crystallization. [0003] In the existing process for preparing anhydrous lithium chloride by crystallization, such as Chinese patents CN 100469696C, CN101172624A, CN 105731503 B, CN 105836767 B and CN 101172624 A, in order to p...

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
IPC IPC(8): C01D15/04
CPCC01D15/04C01P2006/80
Inventor 陈格邓红云严新星
Owner 天齐锂业(射洪)有限公司