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Method for preparing high-brightness ultrafine talcum powder by using black talcum

A technology of ultra-fine talc powder and black talc, applied in the directions of magnesium silicate and silicate, can solve the problems of poor calcination effect, large process pollution, low whiteness, etc., achieve low labor cost, reduce coal consumption, The effect of high product yield

Inactive Publication Date: 2015-01-28
广西晶达新材料科技有限公司 +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Guangfeng County, Jiangxi Province is rich in black talc mines. Since the mine was mined, the raw ore has been directly sold as ceramic raw materials. In order to increase the added value of black talc, the local people calcined the black talc in small vertical kilns, but the calcination method was developed in the vertical kiln. The method of loading a layer of black talc and a layer of coal in the kiln fills the vertical kiln and then ignites the kiln from the bottom of the kiln. This process has large pollution, high energy consumption, poor calcination effect, and low whiteness.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Grind 1000Kg of natural black talc into a coarse powder with a particle size of less than 0.2cm with a hammer crusher, and continuously spray 50kg of water during the crushing process. Use a brick making machine to press the black talc powder containing a certain amount of water into bricks that grow into: width: height = 24cm: 12cm: 6cm, and use 300kg of briquettes to alternately stack the above black talcum bricks in the "O" type calciner, and ignite and calcinate to 1200°C and hold for 5 days, then cooled to 40°C. After cooling out of the kiln, the bricks are ground into a white calcined talc powder with a particle size of 10-12 μm by a ball mill. The whiteness of the product is 94.5%, D 90 = 10.5-11.5 μm.

Embodiment 2

[0023] Grind 1000Kg of natural black talc with a hammer crusher into a coarse powder with a particle size of less than 0.25cm, continuously spray 80kg of water during the crushing process, and press the black talc powder with a certain amount of water to grow with a brick machine: width: height= 24cm: 12cm: 6cm bricks, use 400kg briquettes and the above black talc bricks to alternately stack in the "O" type calciner, ignite and calcinate to 1100°C and keep for 6 days, then cool to 30°C. After cooling out of the kiln, the bricks are ground into a white calcined talcum powder with a particle size of 12-15 μm by a ball mill. The whiteness of the product is 95%, D 90 = 13-14 μm.

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Abstract

The invention relates to a method for preparing high-brightness ultrafine talcum powder by using black talcum and aims to provide a preparation method of a high-brightness ultrafine calcined black talcum brick (powder) which is energy-saving, low in cost, high in yield, high in quality and less in pollution. The method provided by the invention comprises the following steps: crushing and processing natural black talcum into particles with the grain size which is less than 0.3cm, wherein amount of continuously sprayed water is 5-10% of black talcum in the crushing process; compressing the black talcum particles to black talcum bricks; alternately placing the bricks and briquettes in an O-shaped kiln; igniting and calcining for 5-7 days till the in-kiln temperature reaches 1100-1200 DEG C; cooling the bricks to below 40 DEG C and discharging; directly using the discharged bricks in the ceramic industry and grinding the discharged bricks into fine stuff with the grain sizes which are 10-16 mu m by using a ball mill to obtain the high-brightness ultrafine talcum powder. The high brightness ultrafine talcum powder can be used in industries such as plastics, rubber, paper-making, coatings and the like.

Description

technical field [0001] The invention relates to the field of chemical raw material preparation, in particular to a method for preparing black talc into superfine talc bricks (powder) with high whiteness. Background technique [0002] Guangfeng County, Jiangxi Province is rich in black talc mines. Since the mine was mined, the raw ore has been directly sold as ceramic raw materials. In order to increase the added value of black talc, the local people calcined the black talc in small vertical kilns, but the calcination method was developed in the vertical kiln. The kiln is filled with a layer of black talc and a layer of coal. After the vertical kiln is filled, the kiln is fired from the bottom of the kiln. This process has large pollution, high energy consumption, poor calcination effect, and low whiteness. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a preparation method of high-whiteness ultra-fine talc powde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/22
Inventor 张建平张易坤叶小燕
Owner 广西晶达新材料科技有限公司
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