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Technology for producing high-quality zinc phosphate by indirect method

A zinc phosphate, high-quality technology, applied in the direction of phosphorus compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of difficult to obtain high-quality zinc phosphate, complex impurity components, uneven concentration distribution, etc., to facilitate industrial promotion, Good color and high whiteness

Inactive Publication Date: 2016-11-16
重庆天原化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The waste slag of self-heating galvanizing plant and the flue dust of zinc oxide production plant contain a large amount of zinc, which can reach 15-70% in terms of zinc, but its impurity composition is complex, containing other metals and soil and other unknown substances, and its concentration The distribution is uneven, it is difficult to process it, and it is difficult to obtain high-quality zinc phosphate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Stir and mix the zinc-containing waste residue and concentrated sulfuric acid until the pH value is 5.1, continue to stir for 5 minutes, then add hydrogen peroxide until the feed liquid no longer starts to precipitate, continue to stir for 1 hour, then filter, and use 20% sulfuric acid aqueous solution to adjust the pH of the feed liquid The pH value is adjusted to 3.2; the mass fraction is 20% phosphoric acid and solid sodium hydroxide are mixed and stirred until the pH value is 8.0; To a concentration of 15°Bé, the mass fraction of 20% caustic soda solution and the diluted disodium hydrogen phosphate solution are added to the diluted zinc sulfate solution, stirred and mixed until the pH value is 6.5, and the 20% caustic soda solution is mixed with The mass-dosage ratio of the diluted disodium hydrogen phosphate solution is 0.35:1, then stirring, standing, solid-liquid separation, washing to remove water-soluble salt, drying, and grinding to obtain the product zinc phos...

Embodiment 2

[0027] Stir and mix the zinc-containing waste residue and concentrated sulfuric acid until the pH value is 5.1, continue to stir for 15 minutes, then add hydrogen peroxide until the feed liquid no longer starts to precipitate, continue to stir for 0.5 h, then filter, and use 30% sulfuric acid aqueous solution to dissolve the feed liquid The pH value is adjusted to 3.0; the mass fraction is 15% phosphoric acid and solid sodium hydroxide are mixed and stirred until the pH value is 8.5; Dilute to a concentration of 12°Bé, add the caustic soda solution with a mass fraction of 10% and the diluted disodium hydrogen phosphate solution into the diluted zinc sulfate solution, stir and mix until the pH value is 7, and the 20% caustic soda solution The mass ratio to the diluted disodium hydrogen phosphate solution is 0.3:1, then stir, stand still, separate solid from liquid, wash to remove water-soluble salt, dry, and grind to obtain the product zinc phosphate.

Embodiment 3

[0029] Stir and mix the zinc-containing waste residue and concentrated sulfuric acid until the pH value is 5.1, continue to stir for 10 minutes, then add hydrogen peroxide until the feed liquid no longer starts to precipitate, continue to stir for 0.5 h, then filter, and use 25% sulfuric acid aqueous solution to dissolve the feed liquid The pH value is adjusted to 3.2; the mass fraction of 25% phosphoric acid and the mass fraction of 50% sodium hydroxide aqueous solution are mixed and stirred to a pH value of 8.2; the previously prepared zinc sulfate solution is diluted with water to a concentration of 30 ° Bé, the Prepare disodium hydrogen phosphate and dilute it with water to a concentration of 15°Bé, add caustic soda solution with a mass fraction of 15% and diluted disodium hydrogen phosphate solution into the diluted zinc sulfate solution, stir and mix until the pH value is 6.2 , the mass ratio of 20% caustic soda solution to diluted disodium hydrogen phosphate solution is ...

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Abstract

The invention relates to a technology for producing high-quality zinc phosphate by an indirect method, and aims to provide the technology for producing the high-quality zinc phosphate which is low in production cost and good in product quality by the indirect method. The technology for producing the high-quality zinc phosphate by the indirect method comprises the following steps of enabling zinc-containing waste residues and dilute sulfuric acid to be subjected to a reaction, and performing refining so as to obtain a zinc sulfate solution; compounding a disodium hydrogen phosphate solution with phosphoric acid and caustic soda; and adding the compounded disodium hydrogen phosphate solution and a caustic soda aqueous solution to the measured zinc sulfate solution, performing sufficient stirring, standing, solid-liquid separation, washing to remove water-miscible salt, performing drying, and performing grinding to obtain powder which is the zinc phosphate product. The zinc phosphate product prepared by the technology disclosed by the invention is good in color, high in whiteness, small in particle diameter, good in dispersibility and stable in product quality; the zinc phosphate product is low in content of heavy metal, so that the zinc phosphate product not only can be used for producing high-grade antirust paint, but also can be used in the fields with high demands for quality, such as cosmetics and department of dentistry. In addition, when the zinc phosphate is prepared by a method of the technology disclosed by the invention, raw material sources are broad, the cost is low, and industrialized popularization is quite facilitated.

Description

technical field [0001] The invention relates to a zinc phosphate production process, in particular to an indirect process for producing high-quality zinc phosphate. Background technique [0002] Zinc phosphate is a white non-toxic anti-rust pigment. It is a new generation of non-toxic and pollution-free anti-rust pigment with excellent anti-rust and corrosion effects. It can effectively replace traditional anti-rust pigments containing heavy metals lead and chromium. It is used A new variety of anti-rust pigment with ideal effect. In addition, zinc phosphate is also used in the production of chlorinated rubber, adhesives, fire extinguishing agents, flame retardants and medical agents. [0003] In the prior art, there are mainly two methods for the production of zinc phosphate: one is the direct method, which uses high-grade zinc oxide (ZnO≥99.7%) and industrial phosphoric acid as raw materials to directly react to prepare zinc phosphate, and its reaction principle is as fol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/37
CPCC01B25/37
Inventor 何涛潘华何卓魏国强张曼玲
Owner 重庆天原化工有限公司