Device for producing high-activity magnesium oxide by using magnesite tailings

Abstract

The invention relates to a device for producing high-activity magnesium oxide by using magnesite tailings. The device comprises a gas-fired hot air furnace, a filter cake feeder, a flash vaporization drier, cyclone separators, bag-type dust collectors, a preheater, a screw feeder, a flash cyclone dynamic calciner, a gas-solid separator, a clinker silo, an air cooling system and a product stock bin, wherein the gas-fired hot air furnace is connected with the filter cake feeder; the filter cake feeder is connected with the flash vaporization drier; an outlet of the flash vaporization drier is connected with the first cyclone separator and the first bag-type dust collector; the first bag-type dust collector is connected with the preheater; the preheater is connected with the flash cyclone dynamic calciner through the screw feeder; an outlet of the flash cyclone dynamic calciner is connected with the gas-solid separator; the gas-solid separator is respectively connected with the clinker silo and the second bag-type dust collector; the clinker silo is connected with the air cooling system; the air cooling system is connected with the second cyclone separator and the second bag-type dust collector; the second bag-type dust collector is connected with the product stock bin; the flash cyclone dynamic calciner introduces waste heat into the flash vaporization drier.

Description

technical field [0001] The invention relates to the production of refractory materials, in particular to a device for producing high-activity magnesium oxide by utilizing magnesite tailings. Background technique [0002] There are very few good-grade magnesites with a magnesium oxide (MgO) content of more than 46.5% in my country. A large number of low-grade ores and crushed magnesite need to be fully utilized. [0003] At present, the commonly used traditional equipment for the production of high-activity magnesia in my country includes light-fired shaft kilns, rotary kilns, fluidized fluidized kilns, suspension roasters, multi-layer roasters, and reverberatory kilns, all of which have requirements for the structure of calcined minerals, and the sieved powder The shape cannot be reused in the kiln, which wastes resources. The calcination time of uneven lumps and small particles entering the kiln is not properly controlled, and it is prone to under-burning or over-burning. T...

AI Technical Summary

Problems solved by technology

[0003] At present, the commonly used traditional equipment for the production of high-activity magnesia in my country includes light-fired shaft kilns, rotary kilns, fluidized fluidized kilns, suspension roasters, multi-layer roasters, and reverberatory kilns, all of which have requirements for the structure of calcined minerals, and the sieved powder The shape cannot be reused in the kiln, which wastes resources. The calcination time of uneven lumps and small particles entering the kiln is not properly controlled, and it is prone to under-burning or over-burning. The process dust leaks and pollutes the environment. The hydration activity is unstable. Fine grinding and grading, the follow-up process is prone to moisture absorption and secondary pollution, and the product is low and of poor quality

The above equipment has serious defects, making it difficult to complete the high-value utilization of tailings and off-grade powder ore, resulting in waste of resources, serious damage to the environment, and difficulty in meeting the requirements of environmental protection, energy saving and emission reduction, and reducing operating costs.

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