Preparation method of calcined kaolin with low abrasion value

A technology of calcined kaolin and low wear, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve problems such as product brightness or other required performance loss, and achieve low cost, easy operation, and easy dispersion.

Inactive Publication Date: 2013-01-09
唐山麦迪逊高岭土股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Although the above methods reduce the wear of calcined kaolin, these methods generally result in a loss of brightness or other desired properties of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: The preparation method of this low-wear calcined kaolin adopts the following process.

[0021] 1. The raw ore is selected from coal-measure kaolinite associated with Carboniferous-Permian coal, and the molar ratio of silicon to aluminum: SiO 2 / Al 2 o 3 =2.0; pick out miscellaneous stones and impure raw ore, and wash off the sediment on the surface of the raw ore with water;

[0022] 2. Crush the cleaned raw ore, and then grind it into powder, with a 325-mesh sieve remaining ≤ 5%;

[0023] 3. Wet grinding of powdery raw materials: the equipment used is ultra-fine grinding and peeling machine, and the grinding medium is selected from zirconium-aluminum composite beads with self-wearing less than 1‰, and its specific gravity is 3.0-3.5g / cm 3 , Particle size ratio (1 ~ 1.5mm): (1.5 ~ 2mm): (2 ~ 2.5mm) = (0 ~ 10%): (30 ~ 40%): (50 ~ 60%); dispersant selection six Sodium metaphosphate, adding 2.3‰ of the dispersant during the pulping process, adding part o...

Embodiment 2

[0029] Embodiment 2: The preparation method of this low-wear calcined kaolin is the same as that of Embodiment 1 except for the following differences.

[0030] Step 1. The raw ore is selected from kaolin concentrate associated with Carboniferous-Permian coal, and the molar ratio of silicon to aluminum: SiO 2 / Al 2 o 3 =1.9;

[0031] Step 3. The solid content of the wet grinding slurry is 44%, the slurry particle size (-2μ,%) = 94%, D50 = 0.65μm; the dispersant is sodium polyacrylate, and the dispersant is added in the process of adding 3‰ , add a part dropwise during the wet milling process, but the total amount of sodium polyacrylate = 6.5‰.

[0032] Step 5. Raw meal particle size (-2μ,%)=92.5%, D50=0.72μm; the obtained raw meal Einlehner wear value is 10mg / 100000rpm;

[0033] Step 6. Calcination conditions: temperature 875°C, holding time 1h;

[0034] Step 7. Clinker break-up particle size (-2μ,%)=86.5%, D50=0.81μm.

[0035] The calcined kaolin obtained in this embodi...

Embodiment 3

[0036] Embodiment 3: The preparation method of this low-wear calcined kaolin is the same as that of Embodiment 1 except for the following differences.

[0037] Step 1. The raw ore is selected from kaolin concentrate associated with Carboniferous-Permian coal, and the molar ratio of silicon to aluminum: SiO 2 / Al 2 o 3 =2.1;

[0038] Step 3. The solid content of the wet grinding slurry is 42%, the slurry particle size (-2μ,%) = 93.5%, D50 = 0.8μm; the dispersant is sodium polyacrylate, and the dispersant is added in the process of adding 2.3‰ , a part is added dropwise during the wet grinding process, but the total amount of sodium polyacrylate = 6.0‰.

[0039] Step 5. Raw meal particle size (-2μ,%)=92%, D50=0.9μm; the obtained raw meal Einlehner wear value is 10mg / 100000rpm;

[0040] Step 6. Calcination conditions: temperature 900°C, holding time 0.5h;

[0041] Step 7. Clinker break-up particle size (-2μ,%)=86%, D50=1.0μm.

[0042] The calcined kaolin obtained in this e...

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Abstract

The invention discloses a preparation method of calcined kaolin with a low abrasion value. Coal-series kaolin rock or kaolin is screened, washed, smashed, ground, wet-ground and dried to obtain raw materials, the raw materials are depolymerized, scattered and calcined to generate mature materials, and finally the mature materials are depolymerized and scattered to generate finished products. The coal-series kaolin rock or kaolin is coal-permian concomitant coal-series kaolin rock or kaolin, and molar ratio of silicon to aluminum is SiO2 / Al2O3=1.9-2.1. Solid content of wet grinding mud is 42-50%, mud particle size (-2mu,%)>=93%, D50=0.3-0.8mu m. The particle size of the depolymerized and scattered raw materials is (-2mu,%)>=91.5%, D50=0.4-0.9mu m. By matching raw ore scientifically, optimizing raw material wet grinding process and controlling raw material scattering particle size distribution, a raw material abrasion value is controlled effectively, and the calcined kaolin with a low Einlehner abrasion value is obtained. Drug is not required in a preparation process, operation is convenient, cost is low, performance of product whiteness and covering power and the like can not be affected, and obtained products are easy to diffuse in a solution.

Description

technical field [0001] The invention relates to a method for preparing calcined kaolin, in particular to a method for preparing calcined kaolin with low abrasion value. Background technique [0002] Coal-based calcined kaolin, with its unique pseudo-hexagonal platelet structure and high porosity, has the advantages of high light scattering rate and good hiding power. In addition, it has high whiteness, high purity and ultrafine As well as good chemical stability and insulation, coal-based calcined kaolin is widely used in high-grade building materials, paint coatings, papermaking, rubber, plastics, cables, ceramics and other fields. [0003] Different application fields have different requirements on the wear value of kaolin. Especially in the papermaking industry, kaolin is mainly used in two fields, one is the filler used in the papermaking (or papermaking) process, and the other is the pigment used in the surface coating process. The amount of pigment and filler accounts...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/40
Inventor 于全刘学军董建荣刘耀光刘爱忠
Owner 唐山麦迪逊高岭土股份有限公司
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