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Preparation of light calcium carbonate by calcite

A light calcium carbonate and calcite technology, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of large fluctuations in particle size, free alkali sedimentation volume, instability of acid insolubles, and inability to separate them

Active Publication Date: 2008-05-21
黑龙江省石丰新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If calcite is used as raw material in this method, the raw material will be mixed with fuel and ash and cannot be separated during the calcination process.
The whiteness of light calcium carbonate produced by limestone can only reach 94%, and the free alkali, sedimentation volume, and acid insoluble matter are unstable, and the particle size fluctuates greatly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0004] It is the same as the steps of material selection, calcination, hydrolysis and carbonization in the traditional production process, but the specific method of material selection and calcination process is: choose CaCO 3 Calcite with a content of 98% and a whiteness of 96% is used as raw material, crushed into 20-200(mm) 3 Any of liquefied petroleum gas, natural gas, coal gas or coal gas generating gas can be used as fuel. No shaft kiln. 1. Tunnel kiln is adopted: the ore is loaded into the kiln car with bucket and loaded into the kiln, preheated in the preheating section for 8 hours, and the temperature is controlled at 0-600°C. Then enter the calcination section, calcine for 10 hours, and the temperature is controlled at 600-1100°C. Finally enter the cooling section and cool for 4 hours. The temperature of each section is automatically controlled to ensure that the CaO out of the kiln has no raw burning and no over-burning. 2. Use a smoke-reversing kiln: the kiln u...

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PUM

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Abstract

The invention discloses a method for preparation of light calcium carbonate by calcite, wherein the quality of the light calcium carbonate is improved through changing combustion mode, the calcite which has a CaCO3 content of above 97% and a whiteness of above 95% is selected as the raw material, a tunnel kiln, a smoke reversion kiln or board rolling kiln is employed, incineration is carried out through gas fuel. The whiteness for light calcium carbonate can be increased by 3.2%.

Description

technical field [0001] The production of light calcium carbonate from calcite belongs to the preparation method of light calcium carbonate. Background technique [0002] The traditional method of producing light calcium carbonate is to use limestone as raw material, and the calcination process uses a shaft kiln, where limestone and solid fuel are mixed together or layered into the kiln for calcination. Using calcite as a raw material in this way, the raw material is broken and mixed with fuel and ash and cannot be separated during the calcination process. The whiteness of light calcium carbonate produced by limestone can only reach 94%, and the free alkali, sedimentation volume, and acid insoluble matter are unstable, and the particle size fluctuates greatly. Contents of the invention [0003] Provided is a method for producing light calcium carbonate by using calcite as raw material and changing the combustion mode. The same as the traditional production process: to con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18
Inventor 曲玉珠
Owner 黑龙江省石丰新材料科技有限公司