Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Reaction crystallization method for phosphogypsum pretreatment at atmospheric pressure

A technology of reactive crystallization and phosphogypsum, applied in the field of reactive crystallization of atmospheric pressure phosphogypsum pretreatment, can solve the problems of application limitation, low activity, high heating energy consumption and cost, etc.

Inactive Publication Date: 2018-03-13
WUHAN UNIV OF SCI & TECH
View PDF0 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Heat treatment is an effective way to deal with organic matter and eutectic phosphorus, but the cost of heating energy consumption is high, and the product is anhydrous gypsum, which has little activity and is greatly limited in application.

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

[0018] A kind of reaction crystallization method of normal pressure phosphogypsum pretreatment, its specific steps are:

[0019] Step 1: Under the condition of rotating speed of 100-600rpm, prepare a hydrochloric acid aqueous solution with pH=1-7, stir for 10-30min, and then filter with a 45μm nanofiltration membrane to obtain a reaction crystallization solution;

[0020] Step 2: Under the conditions of 40-103°C and 100-600rpm, keep the crystallization solution prepared in step 1 in the crystallizer for 30 minutes and keep it stable for 30 minutes; then add phosphogypsum particles, react and crystallize for 1-4 hours to obtain phosphogypsum suspension slurry;

[0021] Step 3: Filter and wash the phosphogypsum suspension slurry obtained in Step 2; and dry under reduced pressure at 40-60° C. for 8-12 hours to obtain clean phosphogypsum.

[0022] The crystallizer is an atmospheric batch reactor.

[0023] The phosphogypsum particles are ground and sieved phosphogypsum with a par...

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
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention specifically relates to a reaction crystallization method for phosphogypsum pretreatment at atmospheric pressure. A technical scheme of the invention is as follows: a reaction crystallization solution with a certain pH value is prepared; by adopting an intermittent reaction crystallization manner, and through changing of parameters like a pH value, reaction time, a solid-liquid ratioof a suspension slurry and a reaction temperature in a reaction crystallization system, adjustment of the dissolution rate and the purity-removing rate of phosphogypsum soluble impurities in the process of reaction crystallization is realized, so a clean phosphogypsum basically free of soluble impurities is obtained. Compared with a traditional water-washing process, the reaction crystallizationmethod provided by the invention has the advantages of low secondary sewage amount, high impurity removal efficiency and good product quality.

Description

technical field [0001] The invention belongs to the technical field of resource disposal of "three wastes" in environmental engineering, and in particular relates to a reaction crystallization method for atmospheric pressure phosphogypsum pretreatment. Background technique [0002] Phosphogypsum is the main bulk solid industrial by-product in wet-process phosphoric acid and phosphate compound fertilizer industry, and its main component is calcium sulfate dihydrate (CaSO 4 · 2H 2 O). my country has a huge stock of industrial by-product gypsum, with a comprehensive utilization rate of about 27%. It mainly adopts the method of stockpiling. The cumulative stock of phosphogypsum in China has exceeded 300 million tons, covering an area of ​​more than 4,000 hectares, which has brought about increasingly severe soil conditions. , Air and water pollution problems. However, China's phosphate industry still has solid waste pollution, large emissions, and low comprehensive utilization...

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): C04B11/26
CPCC04B11/26
Inventor 张春桃欧雪娇李雪伟
Owner WUHAN UNIV OF SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
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