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Process for producing high-purity magnesia by adopting double-layer sintering spray gun vertical kiln

A high-purity magnesia and vertical kiln technology, which is applied in the field of high-purity magnesia preparation, can solve the problems of short sintering time, low product density, and poor quality, and achieve the effect of prolonging the sintering time

Inactive Publication Date: 2018-08-28
营口金岱国际科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The existing high-purity magnesia shaft kiln adopts a layer of sintering spray gun, and the sintering time is short, so the product body density is low, and the series of products produced thereby have low refractoriness and poor quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] A process for producing high-purity magnesia using a double-layer sintering spray gun shaft kiln: firstly grind the light-burned magnesium powder with a particle size of 200mm, and use a ball mill to grind it until the fineness of 95% of the light-burned magnesium powder is less than 325 mesh The grinding can be completed, and then the balls are pressed with a ball pressing machine. After the balls are pressed, the health drying is carried out, and then the dried magnesium balls are put into the kiln, and the temperature of the shaft kiln is preheated to 1000°C, and the first layer of spray gun is fired. The temperature of the firing zone is 1500°C. After the first layer of spray gun is fired, the second layer of spray gun is fired. The temperature of the firing zone is 2000°C. Finally, it is cooled to 200°C in the cooling zone. It can be made into high-purity magnesia after being discharged from the kiln by the furnace. Wherein the spray gun is a natural gas spray gun, ...

Embodiment 2

[0014] A process for producing high-purity magnesia using a double-layer sintering spray gun shaft kiln: firstly grind the light-burned magnesium powder with a particle size of 180mm, and use a ball mill to grind it until the fineness of 95% of the light-burned magnesium powder is less than 325 mesh The grinding can be completed, and then the balls are pressed with a ball pressing machine. After the balls are pressed, the health drying is carried out, and then the dried magnesium balls are put into the kiln, and the temperature of the shaft kiln is preheated to 900°C, and the first layer of spray gun is fired. The temperature of the firing zone is 1300°C. After the first layer of spray gun is calcined, the second layer of spray gun is fired. The temperature of the firing zone is 180,000°C. Finally, it is cooled to 180°C in the cooling zone. It can be made into high-purity magnesia after being discharged from the kiln by a furnace. The spray gun is a shale oil spray gun. The de...

Embodiment 3

[0016] A process for producing high-purity magnesia using a double-layer sintering spray gun shaft kiln: firstly grind the light-burned magnesium powder with a particle size of 150mm, and use a ball mill to grind it until the fineness of 95% of the light-burned magnesium powder is less than 325 mesh The grinding can be completed, and then the balls are pressed with a ball pressing machine. After the balls are pressed, the health drying is carried out, and then the dried magnesium balls are put into the kiln, and the temperature of the shaft kiln is preheated to 800°C, and the first layer of spray gun is fired. The temperature of the firing zone is 1200°C. After the first layer of spray gun is calcined, the second layer of spray gun is fired. The temperature of the firing zone is 1800°C. Finally, it is cooled to 150°C in the cooling zone. It can be made into high-purity magnesia after being discharged from the kiln by the furnace. The spray gun is a natural gas spray gun, and th...

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Abstract

The invention discloses a process for producing high-purity magnesia by adopting a double-layer sintering spray gun vertical kiln and relates to the technical field of preparation of high-purity magnesia. The process comprises the following specific steps: firstly performing grinding treatment on a caustic-burned magnesia powder with a particle size of 150-200 mm, grinding by adopting a ball mill,ending grinding after the material fineness of 95 percent of the caustic-burned magnesia powder is less than 325 meshes, then ball-pressing by adopting a ball press machine, health-preserving and drying after the end of ball-pressing, then enabling a dried magnesium ball to enter the kiln, preheating the temperature of the vertical kiln to 800-1000 DEG C, opening a first-layer spray gun to calcine till the sintering zone temperature is 1200-1500 DEG C, opening a second-layer spray gun to calcine till the sintering zone temperature is 1800-2000 DEG C after the end of calcination by the first-layer spray gun, finally cooling to 150-200 DEG C through a cooling zone and going out of the kiln by adopting a furnace discharge conveyer to prepare the high-purity magnesia. The process disclosed bythe invention has the benefits that a double-layer sintering spray gun structure is adopted, the sintering time is prolonged, and the purpose of producing the high-density and high-purity magnesia isachieved.

Description

technical field [0001] The invention relates to a process for producing high-purity magnesia by adopting a double-layer sintering spray gun shaft kiln, in particular to the technical field of high-purity magnesia preparation. Background technique [0002] China is one of the countries rich in magnesite resources in the world. Magnesite is one of the unique and important mineral resources in Liaoning Province. Its reserves and output rank first in the world. Among them, Haicheng and Dashiqiao areas are the main ones. The local magnesite mineral resources are rich. Liaoning Haicheng, Dashiqiao, Xiuyan— The proven reserves of the belt are 2.5 billion tons, accounting for more than 85% of the country's total reserves, accounting for 1 / 5 of the world's total proven reserves, and the mineral reserves rank first in the world. [0003] Among the magnesia refractory products, high-purity magnesia occupies an absolute market position as a high-end magnesia refractory material. There...

Claims

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Application Information

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IPC IPC(8): C04B35/043
CPCC04B35/043C04B2235/77
Inventor 毕德利
Owner 营口金岱国际科技有限公司
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