Method for preparing superthin light calcium carbonate using plaster as raw material

A light calcium carbonate and raw material technology, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of difficult promotion of economic benefits, achieve obvious social and economic benefits, protect the ecological environment, and save energy

Inactive Publication Date: 2007-10-03
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this production process successfully converts easily decomposed ammonium bicarbonate into ammonium sulfate needed for agricultural compound fertilizers, it is difficult to promote because of economic benefits

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1: Weigh 100 grams of dry powder of desulfurized gypsum (from Jianbi Power Plant in Zhenjiang City, Jiangsu Province), and add 3% H 2 SO 4 Soak in 200ml for 12h, filter, add 0.1g of sodium lauryl sulfate to the filter material, add 380ml of water, 50ml of 20% ammonia water and 60g of solid ammonia bicarbonate, stir for 60 minutes and filter, collect the filtrate and add dilute sulfuric acid to adjust the pH to neutral Evaporate to dryness to recover ammonium sulfate. The filter material is washed repeatedly with water to the filtrate with BaCl 2 The solution was tested without white precipitation and dried to obtain ultra-fine light calcium carbonate with a particle size of about 0.10 microns.

Embodiment 2

[0013] Example 2: Weigh 150 grams of dry powder of desulfurized gypsum (from Jianbi Power Plant in Zhenjiang City, Jiangsu Province), and add 6% H 2 SO 4 Soak in 250ml for 12h, filter, add 3.0 grams of sodium lauryl sulfate to the filter material, add 100ml of water and 150 grams of solid ammonium bicarbonate, stir for 120 minutes and filter, collect the filtrate, add dilute sulfuric acid to adjust the pH to neutral, and then evaporate to dryness to recover ammonium sulfate . The filter material is washed repeatedly with water to the filtrate with BaCl 2 The solution was tested without white precipitation and dried to obtain ultra-fine light calcium carbonate with a particle size of about 0.03 microns.

Embodiment 3

[0014] Example 3: Weigh 200 grams of dry powder of desulfurized gypsum (from Jianbi Power Plant in Zhenjiang City, Jiangsu Province), and add 10% H 2 SO 4 Soak in 300ml for 12h, filter, add 2.0g of sodium lauryl sulfate to the filter material, add 100ml of water and 175g of potassium carbonate solid, stir for 40 minutes, add 100ml of water and filter, collect the filtrate, add dilute sulfuric acid to adjust the pH to neutral, then evaporate to dry to recover sulfuric acid Potassium. The filter material is washed repeatedly with water to the filtrate with BaCl 2 The solution was tested without white precipitation and dried to obtain ultra-fine light calcium carbonate with a particle size of about 0.07 microns.

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Abstract

A process for preparing the superfine light-weight calcium carbonate from gypsum includes such steps as adding ammonia water to gypsum slurry or not, adding surfactant or not, adding soluble carbonate or dicarbonate, stirring or grinding, filtering, washing, and drying.

Description

Technical field: [0001] The invention relates to a method for preparing superfine light calcium carbonate by using gypsum as a raw material. Background technique: [0002] Ultra-fine light calcium carbonate is a new type of ultra-fine solid material developed in the late 1980s. As an inorganic filler, it has been widely used in industrial products such as rubber, plastics, papermaking, coatings, and inks. The main method of industrial production of light calcium carbonate is to pass CO in lime milk 2 Gas is prepared by carbonization reaction. [0003] At present, my country's industrial by-products of phosphogypsum, desulphurized gypsum, citrate gypsum and fluorogypsum have been increasing year by year. Due to the fact that they have not been fully utilized, they have accumulated and become one of the huge amount of industrial solid waste in my country. [0004] Some companies used phosphogypsum to react with ammonia water and ammonium bicarbonate to produce the target product am...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
Inventor 朱伟长
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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