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Co-production of hydrogen fluoride from white manure and calcium-enriched and ordinary calcium technology

A technology of hydrogen fluoride and white fertilizer, which is applied in the direction of hydrogen fluoride, fluorine/hydrogen fluoride, phosphate fertilizer, etc., and can solve the problems that cannot be collected

Active Publication Date: 2020-11-06
贵州新东浩化工材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although fluorine-containing gas is used to make fluorides such as fluosilicic acid, the impact of possible silicon fluoride gas on the recovery of hydrogen fluoride gas is ignored, and the invention cannot collect effective P 2 o 5 High content of calcium-rich fertilizer

Method used

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  • Co-production of hydrogen fluoride from white manure and calcium-enriched and ordinary calcium technology
  • Co-production of hydrogen fluoride from white manure and calcium-enriched and ordinary calcium technology

Examples

Experimental program
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Embodiment 1

[0026] Such as figure 1 and figure 2 As shown, the co-production of hydrogen fluoride from white fertilizer and calcium-enriched and common calcium process includes the following steps:

[0027] S1 preheating acid: place sulfuric acid and phosphoric acid with a mass fraction of 5% in a reaction kettle and heat for 10 minutes at 60°C without air;

[0028] S2 white manure treatment: put the heated sulfuric acid in S1 into the reactor, and add white manure at the same time, control the temperature in the reactor to 95°C, mix for 6 minutes, and mix to form acid-mixed white manure; pass the generated gas into dehydrogenation in the preparation system;

[0029] S3 white fertilizer formation: pass the mixed acid white fertilizer formed in S2 into the chemical formation chamber, add sulfuric acid and phosphoric acid preheated in S1, control the temperature at 115°C, and react for 1.5 hours to form a mixed acid white fertilizer. The gas is passed into the dehydrofluoride preparatio...

Embodiment 2

[0041] S1 mixed acid solution: place sulfuric acid and phosphoric acid with a mass fraction of 5% in a reaction kettle and mix evenly;

[0042] S2 white fertilizer treatment: put the sulfuric acid in S1 into the reactor, add white fertilizer at the same time, control the temperature in the reactor to 95°C, mix for 6 minutes, and mix to form mixed acid white fertilizer; pass the generated gas into the dehydrofluoride preparation system middle;

[0043] S3 white fertilizer formation: pass the mixed acid white fertilizer formed in S2 into the chemical formation chamber, add sulfuric acid and phosphoric acid in S1, control the temperature at 115°C, and react for 1.5 hours to form a mixed acid white fertilizer, and at the same time pass the generated gas into In the dehydrofluoride preparation system;

[0044] S4 white fertilizer aging: add the multi-acid white fertilizer in S3 to the ripening device, and add sulfuric acid and phosphoric acid in S1 at the same time, and form a mix...

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Abstract

The invention discloses a process for preparing hydrogen fluoride and co-producing calcium-rich fertilizer and single superphosphate from white fertilizer. The process comprises the following steps: S1, preheating acid; S2, treating the white fertilizer; S3, performing formation of the white fertilizer; S4, curing the white fertilizer; S5, performing granulation and drying; S6, performing packaging and storage. The method has the beneficial effects that the preheated dilute sulfuric acid reacts with the dilute phosphoric acid, so that fluorine-containing substances in the white fertilizer fully react, and meanwhile, a high-temperature process flow is adopted, so that the contents of hydrogen fluoride and silicon fluoride in the generated gas are high; pure hydrogen fluoride and silicon fluoride substances are obtained through a dehydrofluorination preparation system, and meanwhile, only sodium salt and potassium salt are used, so that impurity ions are prevented from being introduced excessively; hydrogen fluoride, hydrogen fluoride and silicon fluoride gas are respectively collected, so that a hydrogen fluoride preparation system can conveniently collect and generate hydrogen fluoride with water, anhydrous hydrogen fluoride and fluoride salt.

Description

technical field [0001] The invention relates to the field of recycling and utilization of white manure, in particular to a process for producing hydrogen fluoride from white manure and co-producing calcium-enriched and common calcium. Background technique [0002] At present, the defluorination filter press process is usually used in my country to prepare feed grade calcium hydrogen phosphate. A large amount of waste residue produced in the defluorination section is called defluorination residue (also known as "white manure"), and there is a large amount of citrate-soluble phosphorus in the white manure. and fluorine. At present, the white manure produced in our country is mainly dried and recycled as raw material for rough manure or compound fertilizer, but the harmful fluorine cannot be removed, and the middle fluorine cannot be converted into hydrogen fluoride for recycling, and then directly used as crude fertilizer. Fertilizer or compound fertilizer may cause fluorosis of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B7/19C05B1/04
CPCC01B7/195C05B1/04
Inventor 罗建洪舒爱桦
Owner 贵州新东浩化工材料科技有限公司