CN1323757A

CN1323757A - Superfine burnt kaolin production process

Info

Publication number: CN1323757A
Application number: CN 00107605
Authority: CN
Inventors: 刘埃林; 叶向东; 齐向前; 冯欲晓; 祖吉喆
Original assignee: INNER MONGOLIA MENGXI HIGH AND NEW MATERIAL CO Ltd
Current assignee: INNER MONGOLIA MENGXI HIGH AND NEW MATERIAL CO Ltd
Priority date: 2000-05-15
Filing date: 2000-05-15
Publication date: 2001-11-28

Abstract

The present invention relates to prodn. method of superfine calcium kaolin, it uses mineral with kaolinite content higher than 10% as raw material, said raw material is ground to 20-2000 mesh kaolinite powder which is sent to calcining kiln to proceed calcination treatment, the treated kaolinite powder is sent to slurry preparing machine where is it prepared into slurry by adding water and stirring, said slurry is sent to grinder and grind into fine powder which is dried and deaggregated and graded into product. Advantages include: short processing flow path, fine particle size of product, can be used tomatically controlled, low energy consumption, low production cost etc.

Description

A kind of superfine burnt kaolin production process

The present invention relates to a kind of superfine burnt kaolin production process, this method adopts the ultra-fine again wet-milling of calcining earlier, adopts warm air drying and wind-force depolymerization at last.

Kaolin can be used as the filler and the batching of many products, Chinese patent CN1055526 discloses a kind of method of refined kaolin calcined from kaolinite, this method is earlier kaolinite to be crushed to the 10-160 order, add the water stirring then and be pressed into the vesicular object, the vesicular object is sent into kiln drying handled 4 hours, under 600 ℃ temperature, kept 3 hours then, then roasting 12 hours under 800-925 ℃ constant temperature, treat to carry out grinding again after its cooling, be made into 325 purpose kaolin.The kaolin granularity that aforesaid method is produced is bigger, and energy consumption is higher.

The purpose of this invention is to provide a kind of superfine burnt kaolin production process, the particle less than 2 microns in the kaolin product that this method is produced can reach 50-98%, and energy consumption is lower.

Technical scheme of the present invention is: select for use kaolinite content greater than 10% mineral as raw materials for production, described raw materials for production are ground to form the high mountain range of 200-2000 purpose ore powder, again described high mountain range ore powder is sent into and carried out calcination processing in the calcining kiln, calcining temperature is 600-1300 ℃, calcination time is 20 minutes-6 hours, high mountain range ore powder after the calcination processing sent into add water in the pulping device and stir and to make slurry, the content of moisture is 20%-70% in the described slurry, add the dispersion agent 0.1%-5% that reduces viscosity in this slurry in addition, described slurry sent into carry out levigate processing in the shredder, when particle diameter in the described slurry reaches the 50-98% of solid particulate total amount less than 2 microns solid particulate, finish to grind, and described slurry sent in dry and the depolymerization equipment carry out drying and stage treatment.

Compared with the prior art the present invention has following advantage:

1, because the present invention adopts calcining back wet ultra-fine grinding technology earlier, and therefore, flow process shortens, and number of devices reduces, and product granularity is thin, granularity can be adjusted;

2, because calcination time of the present invention is short, so energy consumption reduces;

3, because the equipment that the present invention uses is few, therefore, gross investment descends, and cost reduces.

The invention will be further described below in conjunction with embodiment.

Embodiment one:

Selecting area, Inner Mongol Coaseries kaolin for use is raw material, kaolinite content is greater than 70% in this raw material, described raw materials for production are ground to form 325 purpose powderies, then it is sent in the tunnel furnace and calcine, calcining temperature is 800-900 ℃, calcination time is 6 hours, raw material after the calcining is cooled to normal temperature, putting into a pulping device then adds water and stirs and to make slurry, the content of moisture is 65% in the slurry, add the dispersion agent 2% that reduces viscosity in this slurry in addition, described dispersion agent is a trisodium phosphate, it also can be tripoly phosphate sodium STPP, it can also be water glass, yellow soda ash or ammoniacal liquor, both above-mentioned several dispersant can be used together, also can select a kind of dispersion agent to use separately, present embodiment is to select a kind of independent use, then described slurry is sent into and carried out levigate processing in the shredder, this levigate processing is called wet-milling, used shredder is cascaded by 3 ultra-fine machines of delaminating and constitutes, when particle diameter in the described slurry less than 2 microns solid particulate reach the solid particulate total amount 90% the time finish to grind, again described slurry is sent into the pneumatic dryer drying treatment, product after the drying treatment is exactly a superfine calcined kaolin, particle diameter accounts for 90% of this product less than 2 microns particle in this product, and particle diameter accounts for 10% of this product greater than 2 microns particles less than 30 microns.

Embodiment two

Selecting area, Inner Mongol Coaseries kaolin for use is raw material, (this raw material is rock or the clay that contains kaolinite mineral, also can be one or more mixtures that contain kaolinite mineral), kaolinite content is greater than 50% in this raw material, after described raw materials for production are ground to form 800 purpose powderies, it is sent in the rotary kiln carry out calcination processing, calcining temperature is 1100 ℃, calcination time is 45 minutes, raw material after the calcining is cooled to normal temperature, putting into a pulping device then adds water and stirs into slurry, the content of moisture is 60% in the slurry, add dispersion agent 1% in this slurry in addition, dispersion agent can be selected Sodium hexametaphosphate 99 for use, polyacrylic acid is received or Sodium salts humic acids, both above-mentioned several dispersant can be used together, also can select a kind of dispersion agent to use separately, present embodiment is to select a kind of independent use, then described slurry is sent into and carried out levigate processing in the shredder, when particle diameter in the described slurry less than 2 microns solid particulate reach the solid particulate total amount 70% the time finish to grind, described slurry being sent into flash dryer handles again, product after the drying treatment is exactly a superfine calcined kaolin, particle diameter accounts for more than 70% of this product less than 2 microns particle in this product, particle diameter greater than 2 microns less than 30 microns particle less than 30% of this product.Can prove by above example, adopt calcining back levigated production method earlier can produce particle diameter less than 2 microns granule content greater than 50% product.

Claims

1, a kind of superfine burnt kaolin production process, it is characterized in that: select for use kaolinite content greater than 10% mineral as raw materials for production, described raw materials for production are ground to form the high mountain range of 200-2000 purpose ore powder, again described high mountain range ore powder is sent into and carried out calcination processing in the calcining kiln, calcining temperature is 600-1300 ℃, calcination time is 20 minutes-6 hours, high mountain range ore powder after the calcination processing sent into add water in the pulping device and stir and to make slurry, the content of moisture is 20%-70% in the described slurry, add the dispersion agent 0.1%-5% that reduces viscosity in this slurry in addition, described slurry sent into carry out levigate processing in the shredder, when particle diameter in the described slurry reaches the 50-98% of solid particulate total amount less than 2 microns solid particulate, finish to grind, and described slurry sent in dry and the depolymerization equipment carry out drying and stage treatment.