A device for producing high-activity magnesium oxide using magnesite tailings

A magnesium oxide device and magnesite tailings technology, which is applied in the field of refractory material production, can solve the problems of dust leakage, pollution of the environment, waste of resources, and damage to the environment, and achieve clean working environment, stable product quality, and full use of heat sources. Effect

Active Publication Date: 2022-07-12
LIAONING DONGHE NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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  • A device for producing high-activity magnesium oxide using magnesite tailings

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Experimental program
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Effect test

Embodiment 1

[0026] A production process for utilizing magnesite tailings to produce a high-activity magnesium oxide device, specifically comprising the following steps:

[0027] 1) After the magnesite tailings flotation, the concentrate powder and the recovered magnesium oxide powder are mixed and processed. The MgO content of the concentrate powder is 42-43%, and the MgO content of the recovered magnesium oxide powder is greater than 95-97.5%. The ratio is 6.5:1;

[0028] 2) The wet material is continuously transported into the flash dryer through the filter cake feeder. Under the combined action of the rotating blade of the main engine and the high-speed hot air flow, the wet material is quickly dispersed into powder, which expands the evaporation area, and the material is heated with hot air. High-speed mass transfer and heat transfer, instantaneous vaporization and evaporation of water molecules, drying and dehydration to ≤1~0.5%, and materials that meet the requirements of restoring ...

Embodiment 2

[0032] A production process for utilizing magnesite tailings to produce a high-activity magnesium oxide device, specifically comprising the following steps:

[0033] 1) After the magnesite tailings flotation, the concentrate powder and the recovered magnesium oxide powder are mixed and processed, the MgO content of the concentrate powder is 43-44%, and the MgO content of the recovered magnesium oxide powder is greater than 95-96%. The ratio is 7:1;

[0034] 2) The wet material is continuously transported into the flash dryer through the filter cake feeder. Under the combined action of the rotating blade of the main engine and the high-speed hot air flow, the wet material is quickly dispersed into powder, which expands the evaporation area, and the material is heated with hot air. High-speed mass transfer and heat transfer, instantaneous vaporization and evaporation of water molecules, drying and dehydration to ≤1~0.5%, and materials that meet the requirements of restoring the ...

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Abstract

The invention relates to a device for producing high-activity magnesia by using magnesite tailings, comprising a gas-fired hot blast stove, a filter cake feeder, a flash dryer, a cyclone separator, a bag filter, a preheater, a screw feeder and a flash dryer. Cyclone dynamic calciner, gas-solid separator, silo, air cooling system and product silo, gas hot blast stove is connected to filter cake feeder, filter cake feeder is connected to flash dryer, and the outlet of flash dryer is connected to the first Cyclone separator and the first bag filter, the first bag filter is connected to the preheater, the preheater is connected to the flash cyclone dynamic calciner through the screw feeder, and the outlet of the flash cyclone dynamic calciner is connected to the gas-solid separator , the gas-solid separator is connected to the silo and the second bag filter respectively, the silo is connected to the air cooling system, the air cooling system is connected to the second cyclone separator and the second bag filter, and the second bag filter is connected to the product silo , the flash swirl dynamic calciner introduces the waste heat into the flash dryer.

Description

technical field [0001] The invention relates to the production of refractory materials, in particular to a device for producing high-activity magnesia by using magnesite tailings. Background technique [0002] There are few good-grade magnesites with a magnesium oxide (MgO) content of more than 46.5% in my country. A large amount of low-grade ores as well as magnesite crushed ore needs to be fully utilized. [0003] At present, the commonly used traditional equipment for the production of highly active magnesia in my country include light burning shaft kiln, rotary kiln, boiling kiln, suspension roasting furnace, multi-layer roasting furnace, and reverberatory kiln, all of which have requirements for the structure of calcined minerals, and the sieved powder It cannot be reused in the kiln, which wastes resources. The calcination time of uneven block and small particles entering the kiln is not properly controlled, and it is prone to under-burning or over-burning. The process...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B2/10
CPCC04B2/102C04B2/104Y02P40/40
Inventor 毕胜民吴国华董宝华孙希忠赵权秦楠钟刚王飞石生凯王新星肖立宏王耶
Owner LIAONING DONGHE NEW MATERIAL CO LTD
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