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

Method for covering surface of gypsum type material with calcium carbonate

A technology of surface coating and calcium carbonate, which is applied in the chemical and chemical industry, can solve the problems of hindering the resource utilization of phosphogypsum, difficult unification of pretreatment methods, and large investment, and achieve the goal of improving application value, simple preparation process, and broad application prospects Effect

Active Publication Date: 2014-01-08
TSINGHUA UNIV
View PDF8 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because phosphogypsum contains harmful components, it must be pretreated before comprehensive utilization, and the unstable quality of phosphogypsum itself makes it difficult to unify the pretreatment methods. The existing comprehensive utilization of phosphogypsum technology requires a lot of equipment and investment Large size and high cost hinder the resource application of phosphogypsum

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for covering surface of gypsum type material with calcium carbonate
  • Method for covering surface of gypsum type material with calcium carbonate
  • Method for covering surface of gypsum type material with calcium carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 8.61g CaSO 4 .2H 2 O and 0.39g of ammonium carbonate were put into the reaction kettle respectively, put in 120 ℃ of ovens and reacted for 24 hours, took out the reaction kettle and let it cool, and obtained the composite material of calcium carbonate coating calcium sulfate hydrate after the sample was taken out and dried. The X-ray diffraction pattern, electron microscope photo and scanning electron microscope energy spectrum line scan pattern of the composite material are respectively figure 1 , figure 2 and image 3 shown.

Embodiment 2

[0023] 1.72g CaSO 4 .2H 2 0 and 0.40g ammonium bicarbonate were put into the reaction kettle respectively, put in 100 ℃ of ovens and reacted for 20 hours, took out the reaction kettle and let it cool down, and obtained the composite material of calcium carbonate coating calcium sulfate hydrate after the sample was taken out and dried.

Embodiment 3

[0025] 4.30g CaSO 4 .2H 2 O and 0.39g of ammonium carbonate were put into the reaction kettle respectively, put in 120 ℃ of ovens and reacted for 24 hours, took out the reaction kettle and let it cool, and obtained the composite material of calcium carbonate coating calcium sulfate hydrate after the sample was taken out and dried.

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

No PUM Login to View More

Abstract

The invention discloses a method for covering the surface of a gypsum type material with calcium carbonate and belongs to the technical field of chemistry and chemical engineering. The method comprises the following steps: putting the gypsum type material and a carbon source substance into a reaction kettle, respectively, reacting the mixture by heating under an airtight condition, and after the reaction is finished, taking out the sample and drying the sample to obtain the gypsum type composite material the surface of which is covered by calcium carbonate. The method disclosed by the invention is simple and convenient, easy to operate, low in cost, high in efficiency and easy to control in conditions; the prepared gypsum type composite material the surface of which is covered by the calcium carbonate is even in particle size distribution and applicable to industrial production; the obtained product has a potential application prospect in industrial and building fields.

Description

technical field [0001] The invention belongs to the technical field of chemistry and chemical engineering, and in particular relates to a method for coating calcium carbonate on the surface of a gypsum material. technical background [0002] Phosphorus chemical industry, salt making and other industries produce a large amount of gypsum materials by-product in production. Among them, phosphogypsum is the solid waste produced by wet process production of phosphoric acid, and salt gypsum is the waste residue produced by the sea salt industry. Their main components are slightly soluble calcium sulfate hydrate. For every ton of phosphoric acid produced, 4.5-5.5 tons of phosphogypsum will be produced. Taking an enterprise with an annual output of 1 million tons as an example, the annual discharge of phosphogypsum is about 5 million tons, and the output of salt gypsum is about 500,000 tons of sea salt. 6-10%. Because phosphogypsum contains harmful components such as phosphorus, f...

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
IPC IPC(8): B09B1/00
Inventor 武玉玲吕阳成骆广生
Owner TSINGHUA UNIV
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