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Preparation method of chromium phosphate

A technology of chromium phosphate and phosphoric acid, which is applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of unfavorable enterprise development and improvement of economic benefits, difficulty in reducing production costs, and difficulty in mass production of enterprises, so as to reduce operating costs. Cost, easy operation, saving investment effect

Inactive Publication Date: 2013-09-04
TIANJIN CHEM REAGENT RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main production method of chromium phosphate is to use sodium phosphate to react with chromium sulfate, and the obtained product is viscous, which is difficult to purify. The problems in this kind of preparation method: 1. In the purification process step, multiple crystallization is required , correspondingly increase the crystallization equipment, the production is more complicated, and it is difficult to reduce the production cost; 2. The purity of the finished product is low, and there is a lot of dust, which makes it difficult for the enterprise to produce in large quantities, which is not conducive to the development of the enterprise and the improvement of economic benefits

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A preparation method of chromium phosphate, the steps are as follows:

[0019] (1) Put 100mol phosphoric acid, 1500mol water, 50mol chromium oxide, and 20mol hydrazine hydrate into a 100L reactor equipped with a heating device, electric stirring, and temperature control device, stir and heat to 70-80°C for reaction, and the stirring time is 6 hour, stop heating, and the salt-forming reaction is completed;

[0020] (2) Carry out crystallization and separation of the generated chromium phosphate, and the granular product obtained is placed in a stainless steel drying sieve with upper and lower ventilation and put into a drying box for drying. The drying time is 24 hours, and the product is obtained by sieving with a content greater than 99%.

Embodiment 2

[0022] A preparation method of chromium phosphate, the steps are as follows:

[0023] (1) Put 100mol phosphoric acid, 1500mol water, 50mol chromium oxide, and 30mol hydrazine hydrate into a 100L reactor equipped with a heating device, electric stirring, and temperature control device, stir and heat to 70-80°C for reaction, and the stirring time is 6 hour, stop heating, and the salt-forming reaction is completed;

[0024] (2) Carry out crystallization and separation of the generated chromium phosphate, and the granular product obtained is placed in a stainless steel drying sieve with upper and lower ventilation and put into a drying box for drying. The drying time is 24 hours, and the product is obtained by sieving with a content greater than 99%.

Embodiment 3

[0026] A preparation method of chromium phosphate, the steps are as follows:

[0027] (1) Put 100mol phosphoric acid, 1500mol water, 50mol chromium oxide, and 40mol hydrazine hydrate into a 100L reactor equipped with a heating device, electric stirring, and temperature control device in sequence, stir and heat to 70-80°C for reaction, and the stirring time is 6 hour, stop heating, and the salt-forming reaction is completed;

[0028] (2) Carry out crystallization and separation of the generated chromium phosphate, and the granular product obtained is placed in a stainless steel drying sieve with upper and lower ventilation and put into a drying box for drying. The drying time is 24 hours, and the product is obtained by sieving with a content greater than 99%.

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Abstract

The invention discloses a preparation method of chromium phosphate. The preparation method comprises the following steps of: (1), adding phosphoric acid, chromium oxide, an initiator and water to a reaction kettle, stirring and heating up, so that carbon dioxide is overflowed to generate chromium phosphate; (2), crystallizing and separating the chromium phosphate generated in the step (1) to obtain a granular product, and placing the product in a drying sieve which is ventilate from top to bottom for drying and sieving to obtain the product. According to the preparation method of the chromium phosphate, byproducts are not generated in the reaction, the generated chromium phosphate is high in purity and granular, the separated product is easy to dry, the use of drying equipment is reduced, the production cost is lowered, the obtained crystallized product is unnecessary to crush, and most dust is avoided. Besides, the preparation method of the chromium phosphate is convenient to operate, simple and easy to implement and capable of improving production efficiency, and conveniently realizes industrial production.

Description

technical field [0001] The invention belongs to the technical field of compound preparation, in particular to a simple and efficient preparation method of chromium phosphate. Background technique [0002] As an effective chromium mineral additive, chromium phosphate has been paid more and more attention and has a wide application prospect. At present, the main production method of chromium phosphate is to use sodium phosphate to react with chromium sulfate, and the obtained product is viscous, which is difficult to purify. The problems in this kind of preparation method: 1. In the purification process step, multiple crystallization is required , Correspondingly increase the crystallization equipment, the production is relatively complicated, and it is difficult to reduce the production cost; 2. The purity of the finished product is low, and there is a lot of dust, which makes it difficult for enterprises to produce in large quantities, which is not conducive to the developme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/37
Inventor 张富强
Owner TIANJIN CHEM REAGENT RES INST
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