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Preparation method of nano spindle precipitated calcium carbonate

A technology for precipitating calcium carbonate and spindles, applied in the direction of calcium carbonate/strontium/barium, nanotechnology, etc., can solve the problems of easy agglomeration, deterioration, and poor dispersion, and achieve simple process flow, good economic benefits, and good dispersion. Effect

Inactive Publication Date: 2018-01-09
青阳县泰鑫新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the product has poor dispersion and is easy to agglomerate in the plastic processing industry. When the filling amount is large, it will even aggravate the deterioration of the mechanical properties of the product.
[0008] To sum up, there are currently no relevant reports on nano-scale spindles in the field of calcium carbonate technology; secondly, the existing industrialized calcium carbonate varieties are difficult to meet the high-filling and high-performance preparation requirements of the plastics industry

Method used

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  • Preparation method of nano spindle precipitated calcium carbonate
  • Preparation method of nano spindle precipitated calcium carbonate
  • Preparation method of nano spindle precipitated calcium carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 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 a mechanized vertical kiln, the calcination temperature is controlled between 950-1150°C, the ratio of limestone and anthracite is 10:1.1, and the calcination time is 20h;

[0032] 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 40°C, and the water consumption is 5 times the mass of lime. The primary lime slurry contains some coarse slag, and impurities are removed through a 40-mesh vibrating screen, a hydrocyclone, a 100-mesh vibrating screen and a 300-mesh vibrating sieve to obtain a refined lime milk Ca(OH)2 slurry.

[0033] Grind the refined milk of lime with a peeling machine, the grinding medium is zirco...

Embodiment 2

[0036] 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 a mechanized vertical kiln, the calcination temperature is controlled between 950-1150°C, the ratio of limestone and anthracite is 10:0.85, and the calcination time is 30h;

[0037] 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 60°C, and the water consumption is 6 times of lime mass. The primary lime slurry contains some coarse slag, and impurities are removed through a 40-mesh vibrating screen, a hydrocyclone, a 100-mesh vibrating screen and a 300-mesh vibrating sieve to obtain a refined lime milk Ca(OH)2 slurry.

[0038] Grind the refined milk of lime with a peeling machine, the grinding medium is 3mm zirconiu...

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. The calcination is carried out in a mechanized vertical kiln, the calcination temperature is controlled between 950-1150°C, the ratio of limestone and anthracite is 10:1.0, and the calcination time is 24 hours;

[0042] 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 5 times of lime mass. The primary lime slurry contains some coarse slag, and impurities are removed through a 40-mesh vibrating screen, a hydrocyclone, a 100-mesh vibrating screen and a 300-mesh vibrating sieve to obtain a refined lime milk Ca(OH)2 slurry.

[0043] Grind the refined milk of lime with a peeling machine, the grinding medium is zirconiu...

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Abstract

The invention relates to a method for preparing nano-grade spindle precipitated calcium carbonate. The method comprises the following steps: (1) preparing calcium oxide, namely a lime semi-finished product; (2) preparing refined lime milk Ca(OH)2 slurry; (3) processing calcium carbonate slurry; (5) carrying out press filtering, drying, crushing and grading on the calcium carbonate slurry to obtaina nano-grade spindle precipitated calcium carbonate product. Compared with a precipitated calcium carbonate preparation technology in the prior art, the method provided by the invention has the advantages and beneficial effects that 1, the nano-grade spindle precipitated calcium carbonate is prepared for the first time; 2, the product has good dispersity and has a remarkable reinforcing and toughening effect in a plastic processing industry at the same time; 3, the method has the advantages of simple technical flow, small investment and good economic benefits.

Description

technical field [0001] The invention relates to the technical field of inorganic materials, in particular to a method for preparing nano-spindle precipitated calcium carbonate. Background technique [0002] Calcium carbonate is a white, non-toxic and important inorganic filler, widely used in plastics, rubber, paper and coatings and other fields. According to different production methods of calcium carbonate, calcium carbonate can be divided into ground calcium carbonate and precipitated calcium carbonate. Heavy calcium carbonate is obtained by mechanical grinding, crushing and grading. Its particle size distribution is wide and its appearance is disorderly. Precipitated calcium carbonate is generally prepared by chemical precipitation, and usually has a certain regular crystal morphology, mostly nano-scale cubes, nano-scale spheres, micron-scale spindles, and micron-scale rods. [0003] Due to the limitations of the preparation process, the particle size of precipitated c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18B82Y40/00C08K3/26
Inventor 刘建峰
Owner 青阳县泰鑫新材料有限公司
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