A kind of rotary kiln for preparing kaolin calcination activation

Abstract

The invention relates to the technical field of environmental protection and resource recycling comprehensive utilization, in particular to a kaolin preparation kaolin roasting activated rotary kiln. It is characterized in that it includes a distributor, a drive gear assembly, a roller assembly, a roasting and activating rotary kiln cylinder assembly, and an air separator. Utilize the high alumina balls to keep rolling and rubbing against each other in the roasting and activation rotary furnace as it rotates, to realize the grinding of the fly ash of the circulating fluidized bed coal-fired boiler that stays at the bottom of the roasting and activation rotary furnace, so as to produce qualified kaolin finished particles .

Description

technical field [0001] The invention relates to the technical field of environmental protection and resource recycling comprehensive utilization, in particular to a kaolin preparation kaolin roasting activated 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 2 o 3 It is th...

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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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