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

Method for preparing nano-scale alpha-type calcium sulfate hemihydrate whiskers from phosphogypsum in reverse microemulsion system

An inverse microemulsion, calcium sulfate hemihydrate technology, applied in chemical instruments and methods, single crystal growth, crystal growth and other directions, can solve the problem that phosphogypsum has not seen relevant reports, and promote the utilization of high value-added resources. , the process is simple, the effect of low energy consumption

Active Publication Date: 2020-02-25
KUNMING UNIV OF SCI & TECH
View PDF8 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using unpretreated raw phosphogypsum as a raw material, using fatty primary alcohol-surfactant-water to construct an inverse microemulsion as a reaction system, the main component of phosphogypsum, calcium sulfate dihydrate, is dissolved in the nano-scale in the emulsion. Recrystallization and precipitation in water droplets to prepare nanoscale α-type calcium sulfate hemihydrate whiskers, control the particle size of water droplets in inverse microemulsion by surface water ratio, indirectly control the microscopic morphology of α-type calcium sulfate hemihydrate whiskers, and at the same time in the preparation There are no relevant reports on the technology to realize the harmless disposal of harmful impurities in phosphogypsum during the process

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 preparing nano-scale alpha-type calcium sulfate hemihydrate whiskers from phosphogypsum in reverse microemulsion system
  • Method for preparing nano-scale alpha-type calcium sulfate hemihydrate whiskers from phosphogypsum in reverse microemulsion system
  • Method for preparing nano-scale alpha-type calcium sulfate hemihydrate whiskers from phosphogypsum in reverse microemulsion system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Preparation of inverse microemulsion: Take 63 parts of n-hexanol, 30 parts of surfactant cetyltrimethylammonium bromide, and 7 parts of water into a beaker, stir with a constant speed stirrer until the emulsion is clear, and get 100 parts reverse phase microemulsion.

[0031] (2) Preparation of α-type calcium sulfate hemihydrate whiskers: Add 100 parts of inverse microemulsion and 15 parts of original phosphogypsum into a three-neck flask, add pH regulator magnesium hydroxide, and adjust the pH value of the emulsion to 6.8~7.2 , and then mixed with 0.56 parts of crystal accelerator calcium chloride according to 0.08% of the water consumption, and then placed on a temperature-controllable magnetic heating stirrer and heated at 105 ° C for 4 hours, and an external condensation device was used to avoid water evaporation to ensure the three-necked flask. Liquid phase equilibrium.

[0032] (3) After the reaction, take out the three-necked flask, pour the emulsion into a...

Embodiment 2

[0035] (1) Preparation of inverse microemulsion: Take 69 parts of n-hexanol, 26 parts of surfactant cetyltrimethylammonium bromide, and 5 parts of water into a beaker, stir with a constant speed stirrer until the emulsion is clear, and get 100 parts reverse phase microemulsion.

[0036] (2) Preparation of α-type calcium sulfate hemihydrate whiskers: Add 100 parts of inverse microemulsion and 22.5 parts of original phosphogypsum into a three-necked flask, add pH regulator magnesium hydroxide, and adjust the pH value of the emulsion to 6.8~7.2 , and then mixed with 0.575 parts of crystal accelerator magnesium chloride according to 0.115% of the water consumption, and then placed on a temperature-controllable magnetic heating stirrer and heated at 95 ° C for 3 hours, and an external condensation device was used to avoid water evaporation, so as to ensure the liquid phase in the three-necked flask balance.

[0037] (3) After the reaction, take out the three-necked flask, pour the...

Embodiment 3

[0040] (1) Preparation of reverse-phase microemulsion: Take 72 parts of n-amyl alcohol, 25 parts of surfactant polyethylene glycol, and 3 parts of water into a beaker, stir with a constant speed stirrer until the emulsion is clear, and obtain 100 parts of reverse-phase microemulsion. lotion.

[0041] (2) Preparation of α-type calcium sulfate hemihydrate whiskers: Add 100 parts of inverse microemulsion and 30 parts of original phosphogypsum into a three-necked flask, add pH regulator sodium hydroxide, and adjust the pH value of the emulsion to 6.8~7.2 , and then mixed with 0.45 parts of crystal accelerator magnesium chloride according to 0.15% of the water consumption, and then placed on a temperature-controllable magnetic heating stirrer and heated at 85 ° C for 2 hours, and an external condensation device was used to avoid water evaporation, so as to ensure the liquid phase in the three-necked flask balance.

[0042] (3) After the reaction, take out the three-necked flask, p...

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
Aspect ratioaaaaaaaaaa
Aspect ratioaaaaaaaaaa
Aspect ratioaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for preparing nano-scale alpha-type calcium sulfate hemihydrate whiskers in a reverse microemulsion system under normal pressure by using raw phosphogypsum as a raw material, and belongs to the technical field of preparation of inorganic functional materials. A fatty primary alcohol, a surfactant, and water are adopted to construct the reverse microemulsion reaction system, the raw phosphogypsum is added in a proportion, after uniform stirring, a PH regulator is added to control the PH value, and a crystal accelerator is added in a proportion; the reverse microemulsion reaction system is heated to a control temperature, and alpha-type calcium sulfate hemihydrate whiskers are formed by crystallization in nano-scale water droplets; and after filtering, washing and drying, the nano-scale alpha-type calcium sulfate hemihydrate whiskers having a high added value and having a diameter range of 200 nm to 500 nm are formed. The method has the advantages of simple process, high operability, short preparation time, low energy consumption, high yield, multiple times of use of the reverse microemulsion and washing water, high product added value, and the like,and is of great significance to ecological environment protection, natural gypsum resource saving, promotion of high value-added resource utilization of the phosphogypsum.

Description

technical field [0001] The method relates to a method for preparing nanoscale α-type calcium sulfate hemihydrate whiskers from phosphogypsum in an inverse microemulsion system, and belongs to the technical field of preparation of inorganic functional materials. Background technique [0002] Phosphogypsum is a by-product of phosphoric acid production by wet process in phosphorus chemical enterprises, and about 4-6 tons of phosphogypsum are produced for every ton of phosphoric acid produced. According to incomplete statistics, in 2014, my country's phosphogypsum emissions reached 76 million tons, and the resource utilization was only 23 million tons. The problem of phosphogypsum resource treatment has become one of the main obstacles restricting the sustainable development of my country's phosphorus chemical enterprises. α-type calcium sulfate hemihydrate whisker is a new functional material with excellent performance and high added value. It has extremely high tensile strengt...

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): C30B29/62C30B29/46C30B7/14
CPCC30B29/62C30B29/46C30B7/14
Inventor 郭荣鑫林志伟杨洋陈星宇颜峰夏海廷孙彦琳马倩敏
Owner KUNMING UNIV OF SCI & TECH
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com