Method for efficiently removing nitrate radical impurities in cobalt sulfate solution

A technology of cobalt sulfate solution and nitrate, applied in the direction of cobalt sulfate, etc., can solve the problems of inability to remove nitrate, failing to meet the requirements for use, and high nitrate content, achieving obvious impurity removal effect, easy operation and short production process. Effect

Active Publication Date: 2016-08-31
GUANGDONG GUANGHUA SCI TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] For the impurity removal of cobalt sulfate products, how to remove the metal impurities in the cobalt sulfate solution is more studied at present, such as the Chinese patent with the patent number ZL201110101859 and the name "Preparation Method of Cobalt Sulfate", which introduces the removal of cobalt leaching solution. Miscellaneous method, this method is to use oxidation precipitation to remove impurity elements such as manganese, iron, arsenic in the cobalt sulfate leaching solution, and then remove impurity elements such as calcium and magnesium through fluoridation precipitation, this patent can only remove metal impurities, how to remove nitrate Impurities are not mentioned; the patent No. is ZL201280059603, and the Chinese patent titled "Ma

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Take the crude cobalt sulfate prepared by the wet leaching extraction method, the specific gravity of the solution is 1.26, and the nitrate content in the solution is 0.5%;

[0022] (2) Take 300kg of the above solution and place it in a 300L enamel reaction kettle, add CP grade dilute sulfuric acid to adjust the pH of the solution to ≤ 2.5, turn on steam to heat and keep the temperature at 75-80°C, connect and turn on the exhaust gas absorption device, and stir with fine Add 350g of CP grade formaldehyde solution with a mass concentration of 40% in the flow mode for reaction. After 30 minutes, add 100g of the above formaldehyde solution every 15 minutes for a total of 4 times. After adding formaldehyde and observing that there is no gas escape, continue the heat preservation reaction For 60 minutes, dilute sulfuric acid was added during the reaction process to keep the pH of the solution ≤ 2.5. A total of 750g of CP grade 40% formaldehyde solution was added during th...

Embodiment 2

[0026] (1) Take the crude cobalt sulfate prepared by the wet leaching extraction method, the specific gravity of the solution is 1.28, and the nitrate content in the solution is 0.8%;

[0027] (2) Take 300kg of the above solution and place it in a 300L enamel reaction kettle, add CP grade dilute sulfuric acid to adjust the pH of the solution to ≤ 2.5, turn on steam to heat and keep the temperature at 80-85°C, connect and turn on the waste gas absorption device, and stir with fine Add 550g of CP grade formaldehyde solution with a mass concentration of 40% in the flow mode for reaction. After 30 minutes, add 150g of the above formaldehyde solution every 15 minutes for a total of 3 times. After adding the formaldehyde solution and observing that there is no gas escape, continue to keep warm React for 70 minutes, add dilute sulfuric acid during the reaction to keep the pH of the solution ≤ 2.5, add 1000g of CP grade 40% formaldehyde solution during the reaction, and absorb the wast...

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Abstract

The invention provides a method for efficiently removing nitrate radical impurities in a cobalt sulfate solution. The method comprises the steps of firstly, adjusting the pH value of a crude cobalt sulfate solution to be lower than or equal to 2.5 with dilute sulphuric acid; then adding a formaldehyde solution with the concentration being 40% and the mass of nitrate radicals being 0.4-0.5 time to the cobalt sulfate solution; conducting a reaction at the temperature of 75-85 DEG C; then removing formaldehyde left by the reaction with hydrogen peroxide with the concentration being 30% and the formaldehyde amount being 1.4-1.5 times; then conducting filtration, concentration, cooling and crystallization, so that high-purity cobalt sulfate heptahydrate is obtained. The impurity removal method is easy and convenient to operate, short in production procedure, mild in technological condition and easy to control; no other impurity is generated in the reaction process except a target product, gas and water; the nitrate radical impurities can be effectively removed; the content of the nitrate radical impurities in an obtained cobalt sulfate hexahydrate product can reach 0.02% or below; the method meets the using requirements of such industries as electronic information, batteries, catalysis and analytical tests.

Description

technical field [0001] The invention relates to a method for removing impurities, in particular to a method for removing nitrate impurities in a metal salt solution, and more particularly to a method for efficiently removing nitrate impurities in a cobalt sulfate solution. Background technique [0002] Cobalt sulfate heptahydrate is a rose-red monoclinic crystal, which turns into a red powder after dehydration, soluble in water and methanol, slightly soluble in ethanol. In the past, cobalt sulfate was mainly used in ceramic glazes and paint driers, as well as in electroplating, alkaline batteries, production of cobalt-containing pigments and other cobalt products, catalysts, analytical reagents, tire adhesives and lithopone additives, etc.; In recent years, cobalt sulfate has been widely used as a raw material for secondary battery cathode materials, and has broad market prospects. However, the existence of nitrate in cobalt sulfate has a great impact on its performance. In ...

Claims

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Application Information

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IPC IPC(8): C01G51/10
CPCC01G51/10C01P2006/80
Inventor 陈锐宋陈旭波谭泽李明黄司平
Owner GUANGDONG GUANGHUA SCI TECH
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