Technique for reducing viscosity of illite containing kaolin

A process method and kaolin technology, applied in the treatment of dyeing low molecular weight organic compounds, dyeing high molecular organic compounds, fibrous fillers, etc., can solve the problems of limited viscosity reduction, limited level of mechanical viscosity reduction, no technical process, etc. Achieve significant viscosity reduction, improved viscosity characteristics, and universal applicability

Inactive Publication Date: 2012-12-26
CHINA UNIV OF GEOSCIENCES (WUHAN) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods of urea intercalation modification can significantly increase the viscosity concentration of kaolin, they only have a good viscosity-reducing effect on kaolin with a better crystallinity, and the viscosity-reducing effect on kaolin with impurities and poor crystallinity Not obvious, viscosity reduction has limitations
[0005] Chinese patent CN1315601A proposes a method for reducing the viscosity of kaolin based on mechanical methods. Using kaolin ore as raw material, the mixed material of the processed raw material and water is put into equipment with kneading and extrusion functions, and the mixed material is mechanically processed. Kneading and extruding is used to process kaolin finished products. Although this method can increase the viscosity concentration of raw materials from 50% to 65% to more than 68%, the viscosity reduction effect is affected by raw ore factors, and the level of mechanical viscosity reduction is limited. At the same time, kaolin cannot be guaranteed. product whiteness
However, the entire experimental procedure is cumbersome and complicated, which is not conducive to operation; the use of various chemical reagents has an impact on other chemicals in papermaking coatings, and the viscosity concentration is unstable; surface activation treatment (that is, the use of dispersant sodium polyacrylate) has limitations in reducing viscosity. bigger
[0007] To sum up, at present, the viscosity reduction research technology for high-purity kaolin is relatively mature, and the viscosity concentration can basically meet the needs of the paper industry. Relatively mature technical process report

Method used

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  • Technique for reducing viscosity of illite containing kaolin
  • Technique for reducing viscosity of illite containing kaolin
  • Technique for reducing viscosity of illite containing kaolin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A process for reducing the viscosity of illite-containing kaolin, comprising the following steps:

[0037] (1) Purify raw kaolin ore;

[0038] (2) Take 100g of purified kaolin and 5mL of 15mg / L nitrogen methylpyrrolidone (NMF), mix them in a high-speed mixer for 5min, and then dry them in an oven at 80°C for 2h to obtain a premix;

[0039] (3) Mix 100g of the premix obtained in step (2) with 2.0g of urea in a high-speed mixer for 10 minutes, then move it into an oven, set the temperature at 90°C, keep it sealed for 2 hours, and obtain the mixture;

[0040] (4) Disperse the mixture obtained in step (3) in a high-speed mixer, add 0.35 g of composite dispersant at the same time, and mix for 10 minutes to obtain low-viscosity kaolin.

[0041] According to the national standard "GB / T 14564-2008", the viscosity concentration test is carried out. After the above treatment, the viscosity concentration of the kaolin sample can be increased from 66.9% to 71.05%.

Embodiment 2

[0043] A process for reducing the viscosity of illite-containing kaolin, comprising the following steps:

[0044] (1) Purify raw kaolin ore;

[0045] (2) Take 100g of purified kaolin and 7mL of 15mg / L nitrogen methylpyrrolidone (NMF), mix them in a high-speed mixer for 10min, and then dry them in an oven at 85°C for 2h to obtain a premix;

[0046] (3) Mix 100 g of the premix obtained in step (2) with 4.5 g of urea in a high-speed mixer for 10 minutes, then move it into an oven, set the temperature at 90°C, keep it sealed for 3 hours, and obtain the mixture;

[0047] (4) Disperse the mixture obtained in step (3) in a high-speed mixer, add 0.35 g of composite dispersant at the same time, and mix for 10 minutes to obtain low-viscosity kaolin.

[0048] According to the national standard "GB / T 14564-2008", the viscosity concentration test is carried out. After the above treatment, the viscosity concentration of the kaolin sample can be increased from 66.9% to 71.24%.

Embodiment 3

[0050] A process for reducing the viscosity of illite-containing kaolin, comprising the following steps:

[0051] (1) Purify raw kaolin ore;

[0052] (2) Take 100g of purified kaolin and 10mL of 15mg / L nitrogen methylpyrrolidone (NMF), mix them in a high-speed mixer for 8 minutes, and then dry them in an oven at 90°C for 2 hours to obtain a premix;

[0053] (3) Mix 100 g of the premix obtained in step (2) with 3.0 g of urea in a high-speed mixer for 15 minutes, then move it into an oven, set the temperature at 95°C, keep it sealed for 4 hours, and obtain the mixture;

[0054] (4) Disperse the mixture obtained in step (3) in a high-speed mixer, add 0.30 g of composite dispersant at the same time, and mix for 10 minutes to obtain low-viscosity kaolin.

[0055] According to the national standard "GB / T 14564-2008", the viscosity concentration test is carried out. After the above treatment, the viscosity concentration of the kaolin sample can be increased from 66.9% to 71.11%.

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Abstract

The invention relates to a technique for reducing the viscosity of illite containing kaolin, which comprises the following steps of : (1) purifying raw materials; (2) evenly mixing the kaolin and N-methyl pyrrolidone in proportion in a high-speed mixer and drying in an oven to obtain the premix; (3) mixing the premix and urea in proportion in the high-speed mixer, then moving to the oven for sealing and preserving the heat to obtain a mixture; and (4) dispersing the mixture in the high-speed mixer, adding composite dispersant and mixing to obtain kaolin with low viscosity. The method provided by the invention can reduce the viscosity of the illite containing kaolin effectively without the influence of the crystalline degree of kaolin and the mineral composition.

Description

technical field [0001] The invention relates to a process method for reducing the viscosity of illite-containing kaolin, which belongs to the field of papermaking raw material processing and application. Background technique [0002] Kaolin is an important clay mineral with a 1:1 layered structure. Because of its good physical and chemical properties, it is widely used in papermaking, ceramics, plastics, rubber and other fields. However, due to differences in ore origin, mineral combination, weathering degree, processing technology and technology, the quality of kaolin in my country is often lower than that of kaolin products in the United States and Brazil. In my country, high-quality kaolin resources with fine particle size, high purity, high whiteness and high viscosity are very scarce, especially kaolin for papermaking with high viscosity. The viscosity concentration of kaolin in my country is generally low (generally 65% ​​to 70%), while the viscosity concentration of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/42C09C3/08C09C3/10
Inventor 仇秀梅严春杰王洪权马玉南周春宇陈颂文
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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