Production technology of high

Abstract

The present invention relates to a manufacturing technique of kaolin with high viscosity and concentration. A manufacturing technique of kaolin with high viscosity and concentration is characterized by comprising following procedures: 1) manufacturing kaolin slurry J with kaolin extracted by hydraulic machinery method undergoing pulping, classification, chemical bleaching, iron removal by washing, dehydrating through pressure filters, dispersed pulping, exfoliation, vibration screen classification ; 2) spray drying and intercalation which is accomplished by a) firstly, improving product lines of a spray drying equipment, that is, adding a thermal insulation layer to a packing auger, a lift pot and a storage hopper of the spray drying equipment, and then arranging a variable frequency feeding machine communicated with a urea crusher through pipelines on the packing auger of the bottom of a spray drying mouth of the spray drying equipment; b) spray drying to achieve kaolin powder; c) intercalating intercalation agent urea with the kaolin powder through the variable frequency feeding machine with parameter of a fresh feed pump between 2 HZ and 8 HZ and with additional of mass of the intercalation agent urea between 2 percent and 10 percent of the mass of the kaolin powder; thereby getting final kaolin products with viscosity and concentration between 72 percent and 73.7 percent. The manufacturing technique can produce kaolin with high viscosity and concentration.

Description

technical field [0001] The invention relates to a production process of high-viscosity kaolin. Background technique [0002] Kaolin is mainly composed of kaolinite group minerals. Kaolinite is a 2-octahedral 1:1 type layered silicate. formed by interconnecting. It is widely used, mainly as paper coating or filler to increase paper whiteness, opacity, smoothness and printability. [0003] At present, the kaolin used in papermaking in my country is in short supply, and most of the kaolin used by domestic papermaking enterprises depends on imports. There are a lot of domestic studies on viscosity, but most of them are not effective. The viscosity concentration of papermaking kaolin in my country is mostly between 66% and 70% (the kaolin industry often expresses the level of viscosity with the viscosity concentration value, and its unit is the percentage concentration value at 500mPa s. A large value indicates low viscosity; otherwise, high viscosity ), and with the developme...

AI Technical Summary

Problems solved by technology

[0009] Looking at other studies on the viscosity reduction of kaolin in China, there is no industrial use of intercalation technology to reduce the viscosity of kaolin, and most of the research in the laboratory is focused on the use of various new surfactants to reduce the viscosity of kaolin. The concentration is basically less than 72%

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