Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Phosphoric acid desulphurization or/and defluorination method for ammonium biphosphate industrial production

A technology of ammonium dihydrogen phosphate and phosphoric acid, used in chemical instruments and methods, phosphates, phosphorus oxyacids, etc.

Inactive Publication Date: 2014-03-19
耿兆翔
View PDF5 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] And it adopts two-stage neutralization and defluorination, two-stage precipitation, one-stage separation, and circulating acid dissolution (HF acid and H 2 SiF 6 ) method; it can only be used for the defluorination of industrial phosphoric acid, but cannot be used for the production of ammonium dihydrogen phosphate compound fertilizer with high requirements for bulk and assembly line operations

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0084] (1). 1. The reaction temperature between sulfuric acid and fluorine-containing apatite should be controlled at 65°C, so that hydrogen fluoride exists in the form of hydrogen-bonded association (HF)n below 80°C, and at the same time reduce the water solubility of silica , does not react with silicon dioxide to generate silicon tetrafluoride or fluorosilicic acid, and also prevents the formation of orthosilicic acid hydrolyzed by silicon tetrafluoride; the reaction between sulfuric acid and fluorine-containing apatite is mixed and stirred at medium and low speeds to make sulfuric acid Full contact with apatite, fast and full reaction; low-speed stirring 300 rpm; medium-speed stirring 600 rpm, single medium-speed stirring blade length 20cm-30cm, the angle between the stirring blade and the horizontal plane 20°-30°, stirring The horizontal angle of the blade is inversely proportional to the length of the stirring blade, the medium-speed stirring speed is inversely proportion...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
lengthaaaaaaaaaa
Login to View More

Abstract

The invention provides a phosphoric acid desulphurization or / and defluorination method for ammonium biphosphate industrial production. The invention relates to an inorganic chemical technology field. The method comprises: according to an amount of 100-105%, adding calcium oxide or calcium hydrate required by reacting sulfate radical and fluorinion respectively with calcium hydrate, into dilute phosphoric acid obtained in the reaction of sulfuric acid with fluor apatite for the ammonium biphosphate industrial production, stirring at medium and high speed in 800-3000 r / min, filtrating to separate gypsum, calcium fluoride or / and metasilicic acid, magnesium hydroxide, iron hydroxide and aluminium hydroxide, and carrying out desulphurization and / or defluorination. The method is applied in industrial production of an ammonium biphosphate agricultural composite fertilizer.

Description

Technical field: [0001] The invention relates to the technical field of inorganic chemical industry, in particular to a method for phosphoric acid desulfurization or / and defluorination in the industrial production of ammonium dihydrogen phosphate. Background technique: [0002] Ammonium dihydrogen phosphate agricultural compound fertilizer is a bulk industrial product with small profits. The main impurity of the product is water-soluble MgSO produced by the reaction of fluorine-containing apatite powder and sulfuric acid. 4 、Al 2 (SO 4 ) 3 , Fe 2 (SO 4 ) 3 And hydrogen fluoride; while HF and the associated mineral SiO in apatite powder 2 combined into gaseous SiF 4 , if HF is excessive, SiF 4 further generate H 2 SiF 6 . SiF 4 It can be hydrolyzed into orthosilicic acid (H 4 SiO 4 ) and HF; orthosilicic acid (H 4 SiO 4 ) is a white colloidal precipitate that is insoluble in water, and is also insoluble in aqueous phosphoric acid. The fluorine-containing apat...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/28C01B25/222C01B25/237C05B11/08
Inventor 耿兆翔
Owner 耿兆翔
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com