High-activity MgO roasting technology and special device thereof

Abstract

The invention discloses a high-activity MgO roasting technology and device. The roasting technology comprises the following steps: firstly, enabling magnesium carbonate powder and hot air to be in contact and mixed to absorb heat, and pre-heating the material until the temperature is about 350 DEG C; then carrying out cyclone calcination and calcining and decomposing in a temperature range of 800DEG C to 1000 DEG C to obtain an MgO and CO2 mixture; conveying the cooled MgO and CO2 mixture into a separation device and carrying out gas-material separation; conveying collected powder into a finished-product cabin and storing; after treating escaped waste gas through a water gas treatment device, discharging the waste gas into the atmosphere through a chimney. According to the high-activity MgO roasting technology and device, disclosed by the invention, the disadvantages of an existing high-activity MgO calcination device of large equipment investment, short running period, large repairing strength, high heat consumption and great product quality fluctuation are changed and the High-activity MgO roasting technology and the special device thereof are developed; the device has the advantages of less investment, simple equipment, long service life, low repairing difficulty, low firing heat consumption and good product activity stability.

Description

technical field [0001] The invention relates to light-burned MgO roasting kiln technology, in particular to a high-activity MgO roasting process using magnesite and a special device thereof. Background technique [0002] Light-burned MgO is produced from magnesite (MgCO 3 ) after calcining and grinding. Magnesite (MgCO 3 )’s theoretical decomposition temperature is 560°C; when the temperature is lower than 560°C, magnesite cannot decompose, resulting in raw burning; when the temperature is higher than 560°C, magnesite begins to decompose, and the MgO produced has a small particle size and high activity; As the calcination temperature increases, MgO becomes denser and less active. [0003] Roasting of light-burned MgO is a chemical reaction process, MgCO 3 Decomposes into MgO and CO when heated 2 , Both over-burning and under-burning will lead to a decrease in the activity of MgO, or even loss of activity. [0004] The activity of MgO is directly related to the calcinat...

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Problems solved by technology

[0010] The invention overcomes the disadvantages of high-activity MgO calcining equipment in the prior art, such as large equipment investment, short operation period, high maintenance intensity, high heat consumption, and large product quality fluctuations, and provides a low-investment, simple equipment, long service life, and easy maintenance. High activity MgO roasting process and its special equipment with low difficulty, low burning heat consumption, good product activity and stability

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