Method for producing light calcium carbonate slurry and light calcium carbonate paste

A light calcium carbonate, production method technology, applied in the direction of calcium carbonate/strontium/barium, products, reagents, etc., can solve the problems of poor product quality, low sedimentation volume, complex process, etc., and achieve high output rate, whiteness High and high whiteness effect

Inactive Publication Date: 2012-05-02
JIANDE YUNFENG CALCIUM CARBONATE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The traditional production of light calcium carbonate has low sedimentation volume, coarse particle size, and drying after dehydration. The process is complex and the product quality is poor.

Method used

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  • Method for producing light calcium carbonate slurry and light calcium carbonate paste
  • Method for producing light calcium carbonate slurry and light calcium carbonate paste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0014] Embodiment: the production method of this slurry and pasty light calcium carbonate, comprises the following steps:

[0015] 1) Water treated with a filter is hydrated with lime CaO at a volume ratio of 7:1 at 40°C to generate a Ca(oh)2 slurry. The lime is obtained by calcining limestone at 1000-1100°C Among them, the limestone is made of dense limestone with high purity, heavy metals and impurities, and the specific indicators are as follows: purity ≥ 99.5%, heavy metal ≤ 20ppm, iron content ≤ 80ppm, lead content ≤ 2ppm, arsenic content ≤ 2ppm, magnesium Content≤0.3%.

[0016] 2) The Ca(oh)2 slurry passes through sieves with different meshes three times from small to large, namely 125 mesh, 200 mesh and 320 mesh respectively, to remove impurities in the Ca(oh)2 slurry and obtain uniform particle size and high purity It is a raw slurry, through a hydrocyclone, to further remove impurities, including heavy metals such as non-metallic silicon, lead, etc., and the Baume de...

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Abstract

The invention relates to a method for producing light calcium carbonate slurry and light calcium carbonate paste. The method mainly comprises the following steps that 1, warm water and lime undergo a hydration reaction to produce Ca(OH)2 slurry; 2, the Ca(OH)2 slurry orderly passes through sieves having different mesh numbers at least more than twice, wherein the sieve having a small mesh number is used prior to the sieve having a large mesh number, and then passes through a cyclone separator, wherein a raw slurry baume degree is in a range of 10 to 14Be; and 3, the Ca(OH)2 slurry treated by the step 2 is fed into a carbonization tower, and reacts with a mixed gas of CO2 and N2; when a temperature of the reaction solution rises to a temperature of 50 DEG C, a crystal form control and desulfurizing agent is added into the reaction solution and CO2 is fed into the reaction solution; when the reaction is finished, a desulfurizing agent, a metal ion chelating agent and a pH conditioning agent are orderly added into the products; a carburization process is carried out for 5 minutes; and a centrifugal dehydration process and a drying process are carried out so that the light calcium carbonate paste is obtained. The method provided by the invention has the advantages that a yield and whiteness are high; through the added reagents, feeding time can be controlled automatically so that a light calcium carbonate paste crystal shape is complete and light calcium carbonate paste crystal sizes are uniform; solid content is controlled in dehydration so that the light calcium carbonate paste can be obtained without drying; and the light calcium carbonate slurry and light calcium carbonate paste have obvious prospects of application in a paper industry.

Description

technical field [0001] The invention relates to a chemical synthesis method, mainly a production method of slurry-like and paste-like light calcium carbonate using calcium hydroxide as raw material. Background technique [0002] Light calcium carbonate is an inorganic chemical product with a wide range of uses. Adding fillers to traditional and common papermaking can improve the opacity and brightness of paper. Papermaking calcium is used as a raw material for heavy calcium carbonate. Papermaking application research, from Change the acid test glue to neutral test glue. In recent years, well-known manufacturers have gradually converted heavy calcium carbonate into light calcium carbonate as raw materials. The traditional production of light calcium carbonate has low sedimentation volume, coarse particle size, and drying after dehydration. The process is complicated and the product quality is poor. Contents of the invention [0003] Purpose of the present invention will o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
CPCY02P20/141
Inventor 陈俊平姚余成张光泉汪玉英
Owner JIANDE YUNFENG CALCIUM CARBONATE
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