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Method for preparing rose calcium carbonate from low-grade limestone

A low-grade limestone and calcium carbonate technology, applied in calcium carbonate/strontium/barium, sustainable manufacturing/processing, chemical industry, etc., can solve the problems of coarse particles, poor hiding power, poor dispersion, etc., and achieve smoothness The effect of improving degree and air permeability, increasing opacity, and enhancing mass transfer efficiency

Inactive Publication Date: 2012-06-20
福建省万旗非金属材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is mainly used in the papermaking industry as ordinary light calcium carbonate, most of which are spindle-shaped, with coarse particles, poor dispersion, and poor hiding power.

Method used

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  • Method for preparing rose calcium carbonate from low-grade limestone
  • Method for preparing rose calcium carbonate from low-grade limestone
  • Method for preparing rose calcium carbonate from low-grade limestone

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The limestone is crushed to a size of 40×120mm by a jaw crusher, and then conveyed to the top hopper of the mechanical shaft kiln by a conveyor belt. The calcination is carried out in an environmentally friendly and energy-saving steel mechanized shaft kiln. The ratio of limestone and anthracite is 10:1. The calcination temperature and calcination time are automatically controlled. The calcination temperature is controlled between 1000 ° C and the calcination time is 25 hours; High activity. The calcined lime is sieved to remove coal slag and small lime powder, and the obtained high-quality block lime enters the rotary digester for lime digestion. The temperature of water for digesting lime is controlled at about 40°C, and the water consumption is 7 times of lime mass. The primary lime slurry contains some coarse slag, and the concentration of calcium hydroxide in the slurry is 12-14%. It passes through a 60-mesh sieve, a hydrocyclone, a 150-mesh sieve and a 250-mesh s...

Embodiment 2

[0037] The limestone is crushed to a size of 40×120mm by a jaw crusher, and then conveyed to the top hopper of the mechanical shaft kiln by a conveyor belt. The calcination is carried out in an environmentally friendly and energy-saving steel mechanized shaft kiln. The ratio of limestone and anthracite is 10:0.95. The calcination temperature and calcination time are automatically controlled. The calcination temperature is controlled between 950 ° C and the calcination time is 36 hours; the burned lime has high active. The calcined lime is sieved to remove coal slag and small lime powder, and the obtained high-quality block lime enters the rotary digester for lime digestion. The temperature of the water for digesting lime is controlled at about 30°C, and the water consumption is 7 times the mass of lime. The primary lime slurry contains some coarse slag, and the calcium hydroxide concentration in the slurry is 11-13%. It passes through a 60-mesh sieve, a hydrocyclone, a 150-me...

Embodiment 3

[0041] The limestone is crushed to a size of 40×120mm by a jaw crusher, and then conveyed to the top hopper of the mechanical shaft kiln by a conveyor belt. Calcination is carried out in an environmentally friendly and energy-saving steel-made mechanized shaft kiln. The ratio of limestone and anthracite is 10:1.1. The calcination temperature and calcination time are automatically controlled. The calcination temperature is controlled between 1050 ° C and the calcination time is 18 hours; Has high activity. The calcined lime is sieved to remove coal slag and small lime powder, and the obtained high-quality block lime enters the rotary digester for lime digestion. The temperature of water for digesting lime is controlled at about 50°C, and the water consumption is 4 times of lime mass. The primary lime slurry contains some coarse slag, and the calcium hydroxide concentration in the slurry is 11-13%. It passes through a 60-mesh sieve, a hydrocyclone, a 150-mesh sieve and a 250-me...

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Abstract

The invention discloses a method for preparing rose calcium carbonate from low-grade limestone, which comprises the following steps: 1) proportionally calcining low-grade limestone and blind coal to prepare calcium oxide; 2) screening under vibrations to remove coal ash and lime powder, thereby obtaining lumpy lime; 3) adding water to slake the lumpy lime, removing impurities by hydrocyclone and vibration screening to obtain fine emulsion slurry, adding a whitener, and aging to obtain the Ca(OH)2 prime slurry; 4) after regulating the temperature and concentration of the Ca(OH)2 prime slurry, adding a crystal form control agent, carrying out bubbling carbonation reaction, and adding a dispersant; when the pH value of the slurry is lower than or equal to 7, stopping carbonation to obtain a cured slurry; and 5) after the cured slurry is thickened, dehydrating to obtain the rose calcium carbonate. Compared with common light calcium carbonate, the rose calcium carbonate disclosed by the invention has the advantages of higher crystal completeness, high surface porosity, high light scattering coefficient and stronger covering power; and the invention is applicable to the industries of paper making, rubber, plastics and paint.

Description

technical field [0001] The invention relates to a method for preparing rose-shaped calcium carbonate by using low-grade limestone. Background technique [0002] Calcium carbonate products can be divided into ground calcium carbonate (GCC) and precipitated calcium carbonate (PCC) according to the processing and preparation methods. [0003] PCC is a kind of calcium carbonate produced by the full reaction of gaseous carbon dioxide and colloidal suspended slaked lime. Through targeted and reliable control of the chemical reaction, the form and crystal size of calcium carbonate can be changed as required. The worldwide PCC market is predicted to increase from 13.3 million tons in 2007 to 16 million tons in 2012, with an average annual growth rate of 3.7%. [0004] PCC is mainly used in plastics, rubber, adhesives, coatings, papermaking and other industries. It is a new type of multifunctional inorganic filler. Whether it is ground calcium carbonate (GCC) or precipitated calciu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18B82Y40/00
CPCY02P20/10
Inventor 谢文清刘亚雄郑新烟罗伟
Owner 福建省万旗非金属材料有限公司
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