Method for preparing sintered magnesia from granular magnesite by two steps

A technology of sintering magnesite and magnesite, which is applied in lime production and other fields, can solve the problems of low output of dry briquetting equipment, high temperature required for reburning, and dust pollution, so as to improve system processing capacity and reduce calcination temperature , the effect of reducing production costs

Active Publication Date: 2021-01-22
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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Problems solved by technology

However, this technology has high requirements on the quality of magnesite raw materials, and only lumpy high-quality raw materials can be used. A large number of powdery and medium-low-quality magnes

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  • Method for preparing sintered magnesia from granular magnesite by two steps
  • Method for preparing sintered magnesia from granular magnesite by two steps
  • Method for preparing sintered magnesia from granular magnesite by two steps

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Embodiment Construction

[0025] The present invention will be described in detail below in conjunction with the embodiments shown in the accompanying drawings.

[0026] The preparation of active magnesium oxide by light burning of magnesite depends on MgCO 3 Decomposition to release CO 2 For the porous particles formed, the preparation of high-density sintered magnesite by magnesite reburning depends on the crystal transformation, but in the final analysis, whether it is the CO produced by the thermal decomposition of magnesite inside the particles 2 The key is the rapid discharge of gas or the gas in the crystal gap. Therefore, the applicant believes that the main reason for the slow rate of light burning and heavy burning (including electric melting) of magnesite should be the temperature difference between the inside and outside of the particles. As we all know, magnesite light-burned powder and heavy-burned powder are refractory materials with excellent heat insulation performance, which means th...

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Abstract

The invention relates to a method for preparing sintered magnesia, in particular to a method for preparing sintered magnesia from granular magnesite by two steps, which can transfer heat from small-particle-size magnesite and discharge CO2 more quickly, and solves the problems of difficulty in heat transfer of large-particle magnesite used in light burning in a traditional reverberatory furnace and heavy burning in a shaft kiln, external temperature higher than internal temperature and high cost. The problems of low activity of light calcined magnesia, low density of dead burnt magnesia and the like caused by inconsistent decomposition and crystal form transformation degrees inside and outside the particles are solved, and the utilization rate of magnesite resources is increased. Especially, the problems of long calcining time and high re-calcining temperature in the traditional technology are solved. According to the method, the characteristics of high heat exchange rate, high yield,uniform particle heating and the like of the fluidized bed/moving bed are utilized, so that the sintering temperature is reduced, the sintering time is shortened, the treatment capacity of the systemis improved, the production cost of sintered magnesia is reduced, and two products, namely active magnesium oxide and sintered magnesia, can be simultaneously produced as required.

Description

technical field [0001] The invention relates to a method for preparing sintered magnesia, in particular to a method for preparing sintered magnesite by a two-step method of powdery magnesite. Background technique [0002] Magnesite is a mineral resource composed of magnesium carbonate as the main mineral. China's magnesite reserves are about 3 billion tons, ranking first in the world, mainly distributed in Liaoning and Shandong provinces, of which Liaoning accounts for 90% above. The products of magnesite calcined and melted at different temperatures are light-burned magnesia, heavy-burned magnesia and fused magnesia. Among them, dead-burned magnesia (also known as sintered magnesia) is an important raw material for refractory materials. It is widely used in iron and steel metallurgy, building materials, non-ferrous metal smelting and other high-temperature industries, accounting for more than 40% of the entire magnesia refractories. Technological developments in these hig...

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Application Information

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IPC IPC(8): C04B2/12
CPCC04B2/102C04B2/12Y02P40/40
Inventor 付亮亮白浩隆白丁荣许光文
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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