Process Flow of Magnesite Calcination by Rotary kiln
Date:2021-03-25 11:24:03
Author:admin
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Magnesite is one of the most important refractory materials in the world. It is mainly used for calcining refractories such as light burnt magnesia, sintered magnesia and fused magnesia. Henan Zhengzhou Mining Machinery Co., Ltd. has accumulated rich experience in magnesite calcination projects, mainly using rotary kilns to calcine magnesite, with advanced technology, environmental protection, energy saving, and high degree of automation. It has a wealth of relevant cases at home and abroad, and has won customers Of praise.
The preheater independently developed and produced by Zhengzhou Mining Machinery has been successfully applied to the calcination of magnesite, saving fuel, increasing output, recycling heat in exhaust gas, and also conducive to dust removal of flue gas, and the emission index is below 30mg/m3.
Calcination Process Requirements of Magnesite:
1. The temperature of the hot air in the calciner must be between 500-1200°C.
2. The particle size of the calcined material needs to be less than 60 mesh.
3. Diversification of combustion fuels: solid (coal), gas (gas, natural gas), liquid (diesel, heavy oil).
4. The combustion method generally adopts: indirect, direct, internal and external combustion.
Calcination Process of Magnesite:
The magnesite is crushed in the mine to meet the required particle size, and then stored in the magnesite yard in the plant. Ferrosilicon and fluorite are directly stored in the warehouse in the factory. The reserves are all considered based on the amount required for production in half a month.
Qualified magnesite is sent to the rotary kiln for calcination; then the calcined magnesite, fluorite, and ferrosilicon are mixed in a certain proportion, and then ball milled and pressed into pellets; put into the reduction tank under vacuum conditions Next, high-temperature thermal reduction is performed to obtain crystalline magnesium; the crystalline magnesium can be remelted and refined to obtain metallic magnesium. Including raw material storage, magnesite calcination, grinding and ball pressing, reduction and refining, etc.
Use energy-saving and environmentally friendly rotary kiln with vertical preheater and vertical cooler. The external magnesite whose particle size and quality meet the requirements is unloaded to the stockyard, where the loader performs stacking and reclaiming operations, and after screening by the vibrating screen, the magnesite with a particle size of 10 to 40 mm is transported to the rotary kiln vertical pre-treatment plant via a belt. The silo on the top of the heater enters the preheater through the material pipe and exchanges heat with the high-temperature flue gas flowing in from the rotary kiln. The material is preheated to above 800℃, and after falling into the transfer chute, it enters the rotary kiln and is calcined at 1250℃ to become active calcining. The white is then discharged into the cooler, where the high-temperature calcined white exchanges heat with the cold air blown by the fan, and the active calcined white is cooled to below 100°C, and the air is preheated to above 600°C. After cooling, the activated calcined white is discharged from the cooler and transported to the ball making workshop by the scale conveyor.
For questions about the magnesite calcination process and related equipment, please consult Henan Zheng Mining Machinery Co., Ltd.
