A method for preparing kaolin roasting activated rotary kiln

Abstract

The invention relates to the technical fields of environment protection and resource cyclic and comprehensive utilization, in particular to a using method of a roasting activation rotary kiln for preparing kaolin. The method is characterized in that high aluminum balls roll continuously and rub with each other in the roasting activation rotary kiln along with rotation of the roasting activation rotary kiln, grinding of circulating fluidized bed coal fired boiler fly ash remaining at the bottom of the roasting activation rotary kiln is achieved, and thus qualified finished kaolin particles areproduced.

Description

technical field [0001] The invention relates to the technical field of environmental protection and resource recycling and comprehensive utilization, in particular to a method for preparing kaolin by roasting and activating a rotary kiln. Background technique [0002] Kaolin is widely used, mainly used in papermaking, ceramics, rubber and plastics, chemical industry, paint, medicine and other industries. The main mineral component of kaolin is kaolinite, and the crystal chemical formula of kaolinite is 2SiO 2 ·Al 2 o 3 2H 2 O, through the calcination process to remove organic matter and lattice reconstruction; mechanical pulverization and jet pulverization to a sufficient fineness to meet the requirements of preparing fillers such as cable plastics and rubber sealing rings, paper coatings, molecular sieves, and catalyst carriers. Circulating fluidized bed coal-fired boiler fly ash is the most common waste in the boiler production process, the main component is SiO 2 、Al ...

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Problems solved by technology

[0003] The purpose of the technical solution proposed in prior art 1 is to provide a rotary calciner with large production capacity, low energy consumption, continuous production and suitable for powder materials. The heating device is an electric heating wire corundum furnace tube. Baffles, but the dust-proof seal of the inlet and outlet of the rotary calciner is difficult to solve. The dust-proof seals currently used, such as labyrinth seals, cannot work reliably at a temperature of 1280°C, resulting in the escape of powder material particles and causing environmental pollution. The reason is that the dynamic and static seal of the labyrinth seal has extremely high requirements, and the temperature difference between the inside and outside of the rotary calciner is extremely large, so it is difficult to meet the requirements for the dynamic and static seal, and the powder material is easy to enter the labyrinth seal and cause failure; the designed baffle is actually similar to a copy board If the powder material contains complex salts with low melting points such as potassium salts, sodium salts, and iron salts, the above-mentioned low melting point molten salts will adhere to the corundum furnace tube wall, affecting the heat transfer efficiency of the furnace tube and sticking Attached with high melting point kaolin particles, over time, the furnace tube and baffles are invalid; the existing technology 2 adopts the technical scheme of combining the fluidized fluidized furnace and the rotary kiln, but the flue gas of the fluidized fluidized furnace does not contact with the material, and the smoke (fly ash) in the flue gas As a pollutant, it is purified by a settling chamber and an electrostatic precipitator, and then discharged to the chimney

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