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Method of preparing high purity zinc phosphate by mechanical activation continuous reaction

A high-purity zinc phosphate, mechanical activation technology, applied in chemical instruments and methods, inorganic chemistry, phosphorus compounds, etc., can solve the problems of high product cost, packaging, and difficult elution, achieve wide application prospects and simplify production. process, the effect of reducing the reaction time

Active Publication Date: 2018-12-07
广西科立方新材料有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the direct method has the following disadvantages: one is that the purity of zinc oxide is high; the other is that the reaction is a solid-liquid reaction, and the produced zinc phosphate is likely to be wrapped on the surface of unreacted zinc oxide, resulting in a low conversion rate of zinc oxide and reducing phosphoric acid. Zinc product quality; third, the market price of the main raw materials phosphoric acid and zinc oxide is high, and the product cost is high
Since zinc ions react with phosphate ions to form zinc phosphate precipitates, the reaction speed is very fast. During the process of forming precipitates, soluble ions will be wrapped inside the zinc phosphate precipitates, and it is not easy to elute, which will affect the quality of zinc phosphate.

Method used

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  • Method of preparing high purity zinc phosphate by mechanical activation continuous reaction
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Embodiment 1

[0027] A method for preparing high-purity zinc phosphate by continuous reaction of mechanical activation is carried out in a system for preparing high-purity zinc phosphate, the system includes a first reactor and a second reactor, and the method comprises the following steps:

[0028] S1: Dissolve soluble ammonium carbonate and soluble zinc sulfate in water respectively, and prepare ammonium carbonate solution and zinc sulfate solution according to the molar ratio of carbonate ions to zinc ions per unit volume of 1:1;

[0029] S2: Transport the zinc sulfate solution to the first reaction kettle at one time, then continuously add the ammonium carbonate solution, stop feeding after adding the same volume of ammonium carbonate solution, and make the two solutions synergistically wet in the first reaction kettle at 25°C Method of mechanical activation, reaction made zinc carbonate or basic zinc carbonate precipitation, insulation reaction 5 minutes; described first reaction kettle...

Embodiment 2

[0032] A method for preparing high-purity zinc phosphate by continuous reaction of mechanical activation is carried out in a system for preparing high-purity zinc phosphate, the system includes a first reactor and a second reactor, and the method comprises the following steps:

[0033]S1: Dissolve soluble sodium bicarbonate and soluble zinc nitrate in water respectively, and prepare sodium bicarbonate solution and zinc nitrate solution according to the molar ratio of carbonate ion to zinc ion per unit volume of 1.5:1;

[0034] S2: Transport the zinc sulfate solution to the first reaction kettle at one time, then continuously add the ammonium carbonate solution, stop feeding after adding the same volume of ammonium carbonate solution, and make the two solutions synergistically wet in the first reaction kettle at 50°C Method mechanical activation, carry out reaction and make zinc carbonate or basic zinc carbonate precipitation, insulation reaction 10 minutes; Described first reac...

Embodiment 3

[0037] A method for preparing high-purity zinc phosphate by continuous reaction of mechanical activation is carried out in a system for preparing high-purity zinc phosphate, the system includes a first reactor and a second reactor, and the method comprises the following steps:

[0038] S1: Dissolve soluble potassium carbonate and soluble zinc chlorate in water respectively, and prepare potassium carbonate solution and zinc salt solution according to the molar ratio of carbonate ions to zinc ions per unit volume of 2:1;

[0039] S2: Transport the zinc chlorate solution to the reaction kettle once, then continuously add the potassium carbonate solution, stop feeding after adding the same volume of potassium carbonate solution, and make the two solutions cooperate with the wet method in the first reaction kettle at 80°C Mechanical activation, reacting to obtain zinc carbonate or basic zinc carbonate precipitation, heat preservation reaction for 20 minutes; described first reaction...

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Abstract

The invention discloses a method of preparing high purity zinc phosphate by a mechanical activation continuous reaction. The method comprises the following steps: S1, dissolving soluble carbonate or hydrogen carbonate and soluble zinc salt in water, separately to prepare a carbonate or hydrogen carbonate solution and a zinc salt solution; S2, mechanically activating the zinc salt solution and thecarbonate or hydrogen carbonate solution in a first reaction kettle synergically in a wet process for a reaction to prepare a precipitate; S3, conveying the precipitate and a solution to a second reaction kettle, adding a phosphoric acid solution, and carrying out a reaction in a mechanical activating condition in a synergic wet process to prepare zinc phosphate. The yield of the obtained productreaches 97.89-98.34%, the content of zinc phosphate dehydrate is 99.27-99.56%, the content of sulfate radicals is 0.032-0.041%, the content of chlorine ions is 0.028-0.042% and the content of lead is0.0012-0.0019%. Compared with the prior art, the output and quality of the product are superior.

Description

【Technical field】 [0001] The invention belongs to the technical field of preparation of inorganic salts, and in particular relates to a method for preparing high-purity zinc phosphate through continuous reaction through mechanical activation. 【Background technique】 [0002] Zinc phosphate is a new type of non-toxic anti-rust pigment with excellent performance, which is used in the coating industry to prepare various anti-rust coatings and water-based coatings. With the development of science and technology and the enhancement of people's awareness of environmental protection, low-toxic and non-toxic anti-rust pigments represented by zinc phosphate will gradually replace traditional and toxic anti-rust pigments containing lead and chromium. At present, in addition to being used in the production of various anti-corrosion and anti-rust pigments, coatings, phosphating agents for metal surfaces such as steel and pharmaceuticals and dental adhesives, it is also used in the produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/37
CPCC01B25/37C01P2006/80
Inventor 胡容平罗想平王则奋潘丽珠黄科林郭佳文张宁潘凯覃宁波
Owner 广西科立方新材料有限公司
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