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Method for preparing cobalt chloride through evaporation and crystallization of cobalt chloride

An evaporation crystallization and cobalt chloride technology, which is applied in the preparation field of cobalt chloride, can solve the problems of long process flow, small cobalt chloride particles, and large equipment investment, and achieves the effect of stable evaporation process and excellent crystals.

Pending Publication Date: 2018-12-07
常州中源工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing cobalt chloride solution adopts still-type atmospheric pressure evaporation, cooling and crystallization, mother liquor returns to the still to continue evaporation, and the crystallization obtains cobalt chloride with a yield of 28% and a density of 1.52g / mL. The disadvantage of this method is that the process flow is long and energy High consumption, high operating cost due to cooling and heating of a large amount of mother liquor, high investment in equipment, and the crystallized cobalt chloride particles are too small, so a batch centrifuge with filter cloth is required, and the efficiency is extremely low

Method used

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  • Method for preparing cobalt chloride through evaporation and crystallization of cobalt chloride
  • Method for preparing cobalt chloride through evaporation and crystallization of cobalt chloride
  • Method for preparing cobalt chloride through evaporation and crystallization of cobalt chloride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Preheating:

[0038] Pump cobalt chloride solution with a temperature ≥ 10°C into the stock solution tank, pressurized by the raw material pump, enter the first-stage plate heat exchanger to preheat to 65°C, then heat to 77°C through the second-stage preheater, and then enter In the falling film evaporator;

[0039] (2) Evaporation and concentration:

[0040] Falling film evaporation: pump the cobalt chloride solution preheated in step (1) into the second-effect falling-film evaporator. In the falling film evaporator, the raw material in the falling film evaporator tube exchanges heat with the heating steam outside the tube to boil and evaporate the raw material, and the raw material is concentrated and then pumped into the forced evaporator;

[0041] Forced evaporation: Fresh steam is introduced into the shell of the heat exchanger of the forced evaporator to exchange heat between the raw material in the tube of the forced evaporator and the shell steam to evapor...

Embodiment 2

[0051] (1) Preheating:

[0052] Pump the cobalt chloride solution with a temperature ≥ 10°C into the raw solution tank, pressurized by the raw material pump, enter the first-stage plate heat exchanger to preheat to 48°C, and then heat it to 65°C through the second-stage preheater, and then enter In the falling film evaporator;

[0053] (2) Evaporation and concentration:

[0054] Falling film evaporation: pump the cobalt chloride solution preheated in step (1) into the MVR falling film evaporator, the raw material in the falling film evaporator tube exchanges heat with the heating steam outside the tube to make the raw material boil and evaporate, and the raw material is concentrated and then pumped into the forced evaporator;

[0055] Forced evaporation: Fresh steam is introduced into the shell of the heat exchanger of the forced evaporator to exchange heat between the raw material in the tube of the forced evaporator and the shell steam to evaporate the raw material and con...

Embodiment 3

[0065] (1) Preheating:

[0066] Pump the cobalt chloride solution with a temperature ≥ 10°C into the stock solution tank, pressurized by the raw material pump, enter the first-stage plate heat exchanger to preheat to 60°C, then heat to 75°C through the second-stage preheater, and then enter In the falling film evaporator;

[0067] (3) cooling crystallization

[0068] In the crystallization process, the super-concentrated cobalt chloride solution that removes free water is added to the cold saturated cobalt chloride solution, so that the supersaturation of cobalt chloride is effectively controlled, so that the production can be carried out, and the obtained particles are very Large crystals in which the mass of the cold saturated solution of cobalt chloride is 5 times the mass of the ultra-concentrated solution of cobalt chloride.

[0069] Other steps are with embodiment 1.

[0070] Feed solution: salt content about 34%, density 1.34g / mL, PH>1.5, feed rate: 11.123T / h, evapor...

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Abstract

The invention belongs to the technical field of preparation of cobalt chloride, in particular to a method for preparing cobalt chloride through evaporation and crystallization of the cobalt chloride.Free water, except for cobalt chloride crystal-removal water, is totally evaporated off in an evaporation stage, so that the repeated heating and cooling processes of mother liquid are avoided. Evaporation is carried out by using a partial series connection method or direct two-effect method through two compressors, and the problem that heating of a boiling point of a solution is higher is solved;in a crystallizing process, the super-thick cobalt chloride solution in which the free water is completely removed is added into a cold cobalt chloride saturated solution, so that the over-saturationdegree of the cobalt chloride is effectively controlled, and the production can be carried out, and moreover, crystals with large particles are obtained.

Description

technical field [0001] The invention belongs to the technical field of preparation of cobalt chloride, in particular to a method for preparing cobalt chloride by evaporation and crystallization of cobalt chloride solution. Background technique [0002] The existing salt solution evaporation method is to use single-effect kettle evaporation, which consumes a lot of energy. After evaporation to a certain extent, it will be cooled and crystallized. The mother liquor after crystallization will continue to return to the kettle for evaporation. Reheating, energy loss is very large. [0003] The main applications of cobalt chloride are: used in the manufacture of instruments to produce barometers, hydrometers, dry and wet indicators, etc., used as colorants in the ceramic industry, used in the manufacture of paint driers in the paint industry, and used in the preparation of animal husbandry Compound feed, used as a beer foam stabilizer in the brewing industry, used in the defense ...

Claims

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Application Information

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IPC IPC(8): B01D9/02B01D1/22B01D1/26B01D1/30C01G51/08
CPCB01D1/22B01D1/26B01D1/30B01D9/0018B01D9/0059C01G51/085
Inventor 徐晨姚洪齐
Owner 常州中源工程技术有限公司
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