Method for preparing calcium sulfate whisker through recrystallization

A calcium sulfate whisker, recrystallization technology, applied in chemical instruments and methods, calcium/strontium/barium sulfate, single crystal growth, etc., can solve the problems of difficult industrial application and high cost, achieve resource utilization, easy The effect of low operating, investment and operating costs

Active Publication Date: 2013-05-01
XIANGTAN UNIV
View PDF22 Cites 27 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a simple and efficient method for preparing recrystallized calcium sulfate whiskers, aiming at the problems of high temperature and high pressure conditions in the existing calcium sulfate whisker preparation technology, high cost, and complicated regulation and control that lead to industrial application difficulties. Introduce as few interfering substances and simplify the control factors as possible in the system, and use the principl

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 calcium sulfate whisker through recrystallization
  • Method for preparing calcium sulfate whisker through recrystallization
  • Method for preparing calcium sulfate whisker through recrystallization

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0031] Example 1:

[0032] Add 110g calcium sulfate dihydrate reagent to 1L sulfuric acid solution with 14% mass percent concentration and stir evenly, and at the same time heat to 85℃ at a rate of 1.5K / min to dissolve, and then stand still, adjust the jacket cold air through PID control system The temperature of the suspension is reduced to 20℃ at an average rate of 0.5K / min, and the temperature is maintained for 0.5h. The product is filtered and washed with water, and then dried at 60℃ for 1h to obtain an aspect ratio of 50 ~110 calcium sulfate dihydrate whiskers.

Example Embodiment

[0033] Example 2:

[0034] Add 6kg of gypsum ore (calcium sulfate content ≥70%) with a particle size of ≤3cm into a tank containing 200L of sulfuric acid solution with a concentration of 25% by mass, and at the same time heat it at a rate of 2.0K / min to 90°C and reduce it Stirring intensity or standing; pump the upper suspension into the crystallization reactor and stir, adjust the flow rate of the jacketed air through the PID control system to reduce the suspension temperature to 20°C at an average rate of 1.0K / min, and maintain the temperature Aging for 1h; the product is vacuum filtered and washed with water to meet the quality requirements; the separated solid phase product is placed in an oven and dried at 60°C for 1h to obtain calcium sulfate dihydrate whiskers with an aspect ratio of 50 to 110 .

Example Embodiment

[0035] Example 3:

[0036] Add 1kg of desulfurized gypsum to a tank containing 100L of sulfuric acid solution with a concentration of 35% by mass and stir evenly. At the same time, it is heated to 75℃ at a rate of 0.5K / min to dissolve and then stand still; the upper suspension is pumped into the crystallization reactor Stir, adjust the flow of cold water in the jacket through the PID control system to reduce the temperature of the suspension to 20°C at an average rate of 1.5K / min, and keep the temperature for 0.5h, filter the product and wash it with water, and then at 60°C Dry for 1 hour to obtain calcium sulfate dihydrate whiskers with an aspect ratio of 50 to 180.

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 discloses a method for preparing a calcium sulfate whisker through recrystallization. The method is characterized in that the method comprises the steps of (1), conducting program control on heating and dissolution courses: putting a raw material with a main ingredient of calcium sulfate into a sulphuric acid solution for stirring, heating simultaneously, heating a mixture to 60-95 DEG C at a certain rate with the adoption of the program control, dissolving for 20min-1h, (2), conducting the program control on cooling and recrystallization courses: using the program control to cool a suspension obtained by dissolution to 10-30 DEG C, ageing for 20min-2h, (3), conducting separating and washing courses: conducting solid-liquid separation on the suspension, washing a separated solid-phase product, and (4), conducting a drying course: drying the washed solid-phase product at a certain temperature, and obtaining the calcium sulphate dihydrate whisker. The calcium sulfate whisker is prepared by utilizing a recrystallization principle under an ordinary-pressure mild condition, and a relatively economical technological approach can be provided for the resource utilization of industrial by-products such as desulfurization gypsum and phosphogypsum.

Description

technical field [0001] The invention belongs to the technical field of preparation of calcium sulfate inorganic mineral whiskers, and specifically relates to the preparation of calcium sulfate whiskers by using the principle of recrystallization under normal pressure and mild conditions, which can be used for resource utilization of industrial by-products such as desulfurized gypsum and phosphogypsum Provide a more economical technical approach. Background technique [0002] Calcium sulfate whisker refers to a whisker-like single crystal that grows in the form of a single crystal under certain conditions and is similar to a short fiber (diameter is generally between 0.01~10μm, and the aspect ratio is 5~1000). It is an environmentally friendly inorganic material. It has important uses in the fields of construction, medicine, plastics, rubber and environmental protection, and is currently used as a reinforcing component of composite materials. The disclosed main methods for p...

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): C30B7/08C30B29/22C30B29/62C01F11/46
Inventor 杨柳春陈晓娟陈敏张俊丰黄妍
Owner XIANGTAN UNIV
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
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap