Deep purification method of cell-grade ferrous sulfate solution

A ferrous sulfate solution, deep purification technology, applied in ferric sulfate and other directions, can solve the problems of pollution, introduction of new impurity ions, odor pollution in the workshop, etc., to achieve the effect of reducing costs, meeting purification requirements, and simple operation process

Active Publication Date: 2018-05-29
襄阳华虹高科新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of ferrous sulfide is easy to introduce other impurity ions, and the addition of sodium sulfide or hydrogen sulfide has the problem of serious odor pollution in the workshop
Therefore, the common sulfide precipitation method has problems such as the introduction of new impurity ions and the environmental pollution caused by hydrogen sulfide leakage.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The polystyrene resin modified by ethylenediaminetetraacetic acid and the polystyrene resin modified by mercapto group are used as the adsorption resin. The size of the polystyrene adsorption resin is 1 mm, and the filling height is 1500 mm. 20h, wet packing, first rinse the adsorption carrier with 5 times the column volume of distilled water, the flow rate of the distilled water rinse adsorption carrier is 5BV / h, and then use 2 times the column volume and 5% sulfuric acid solution to rinse the adsorption carrier, The flow rate of sulfuric acid washing is 3BV / h;

[0048] Wash the scrap iron and react with sulfuric acid to obtain a ferrous sulfate solution after the reaction is complete, filter and remove insoluble matter, adjust the pH value of the ferrous sulfate solution to 1.5, and adjust the total iron concentration to 1mol / L;

[0049] Then, at an operating temperature of 20°C, the above-mentioned ferrous sulfate solution was reversely passed through the polystyrene...

Embodiment 2

[0053] Diatomaceous earth modified with ethylenediaminetetraacetic acid and activated carbon modified with mercapto groups are used as the adsorption carrier. The particle size of the adsorption carrier is 0.6 mm, and the filling height is 1000 mm. It is soaked in an ethanol solution with a volume percentage of 95% for 10 hours. To install the column, first rinse the adsorption carrier with 12 times the column volume of distilled water at a flow rate of 3BV / h, then use 1 times the column volume and 10% sulfuric acid solution to rinse the adsorption carrier at a flow rate of 5BV / h;

[0054] Wash the scrap iron and react with sulfuric acid to obtain a ferrous sulfate solution after the reaction is complete, filter and remove insoluble matter, adjust the pH value of the ferrous sulfate solution to 3.0, and adjust the total iron concentration to 2.3mol / L;

[0055] At an operating temperature of 30°C, pass the above-mentioned ferrous sulfate solution reversely through the diatomite...

Embodiment 3

[0059] Polystyrene resin modified with ethylenediaminetetraacetic acid, porous silica and polyurea modified with mercapto groups are used as adsorption carriers. The size of polystyrene adsorption resin is 0.1mm, the size of polyurea particles is 0.5mm, and the filling height is 700mm , soaked in 85% ethanol solution by volume for 12 hours, wet-packed the column, first rinsed the adsorption carrier with 15 times the column volume of deionized water, and the flow rate of the rinsed adsorption carrier was 1BV / h, and then used 4 times the column volume And the sulfuric acid solution with a concentration of 6% rinses the adsorption carrier, and the sulfuric acid rinse flow rate is 3BV / h;

[0060] Wash the scrap iron and react with sulfuric acid to obtain a ferrous sulfate solution after the reaction is complete, filter to remove insoluble matter, adjust the pH value of the ferrous sulfate solution to 2.0, and adjust the total iron concentration to 1.3mol / L;

[0061] At an operatin...

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Abstract

The invention relates to a deep purification method of a cell-grade ferrous sulfate solution. The method comprises the steps that an adsorption carrier which is modified by sulfydryl and an adsorptioncarrier which is modified by ethylenediamine tetraacetic acid are adopted as adsorption substrates respectively, ferric ions and nickel ions in the ferrous sulfate solution are removed in a segmentation mode, the purified ferrous sulfate solution is obtained, after the acidity of the obtained ferrous sulfate solution is adjusted, the ferrous sulfate solution is directly cooled and crystallized toobtain high-purity ferrous sulfate, and if the content of the ferric ions and nickel ions exceeds the standard after the ferrous sulfate solution passes through the adsorption substrates, the adsorption carrier is regenerated. The deep purification method is simple in process, environmentally friendly and efficient, the purification requirement is met, and the cost is also effectively lowered.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and relates to a deep purification technology of ferrous sulfate solution, in particular to a method for deep purification of battery-grade ferrous sulfate solution. Background technique [0002] Ferrous sulfate is the most important iron salt among iron compounds and has a wide range of uses. In industry, ferrous sulfate can be used as raw material to prepare a series of iron compounds. It is an important chemical raw material. In agriculture, it is mainly used to treat wheat smut, prevent orchard pests and fruit tree rot, and is also an important trace element in animal feed. Additive; ferrous sulfate can also be used to manufacture various iron salts, polyferric sulfate, ink, iron-based pigments, magnetic powder, etc. In recent years, with the rapid development of energy storage equipment, electric bicycles and hybrid vehicles in China, the demand for power lithium-ion batteries has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/14
Inventor 秦振华李建芬关洪清王勤崔昌旭
Owner 襄阳华虹高科新材料有限公司
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