First, simplify the production process
Save magnesia double carbonization production process is optimized on the basis of the transformation process of the conventional dolomite carbonization. It simplifies the production process and increases the suitability for production of multi-species raw materials. According to the production characteristics of different raw materials, different sections and equipment with high energy consumption are subtracted. Such as; mechanical shaft kiln, compressor, boiler, pyrolysis section. Through actual production experiments, different raw materials can be put into production under the conditions of constant process equipment. Such as; dolomite, heavy magnesium oxide, brucite and other raw materials. Through actual production, the product quality can meet the needs of various fields of the market, such as high-purity, high-purity and high-activity, as well as high, medium and low magnesium oxides required for industrial rubber products, chemical products and pharmaceutical products. Magnesium carbonate products.
Second, quantitative flow stratification carbonization
In the trial production process, in order to increase the carbonization rate and the concentration of light magnesium carbonate, the carbonization tower was greatly modified, and a quantitative flow layered carbonization method was implemented to make the carbonization reaction at different pressures, different temperatures, and different flow rates. The conditions are increased, the carbonization rate and the solution concentration of magnesium carbonate are increased. Compared with the conventional bubbling carbonization, the carbonization time of the quantitative flow layered carbonization method is lower than that of the bubbling carbonization method. 10-15 minutes. The magnesium oxide content in the light magnesium carbonate solution is increased to 12-15 g/L, up to 20 g/L.
Third, no heating control decomposition
The process of removing carbon dioxide from a light magnesium carbonate solution to prepare a basic salt. In the conventional carbonization process, the decomposition of light magnesium carbonate is usually carried out by steam heating, and different heating methods are used to obtain basic crystals of different particle sizes. salt, but due to high consumption of coal boiler, waste gas, waste emissions too, does not meet current environmental requirements. For this reason, the decomposition of light magnesium carbonate in the double reduction carbonization process is carried out without any heat. Depending on the requirements of the product and the concentration of the light magnesium carbonate solution, the carbonated magnesium carbonate solution can be decomposed at rest under different conditions, or it can be decomposed under different flow conditions. The basic magnesium carbonate particle size is also different due to the different decomposition conditions. And the obtained magnesium carbonate filter cake has a water content of 60%-70% lower. It provides the basic conditions for calcining different grades of magnesium oxide and reducing calcination energy consumption.
Fourth, reverse reflux rotary calcination
Production of grade-grade light magnesium oxide In addition to the crystallization requirements of magnesium carbonate, the calcination temperature and calcination method play a major role in the physical properties of magnesium oxide. The product is calcined by a reverse reflow rotary furnace, and the high temperature section is made of heat-resistant cast stainless steel. The maximum temperature can reach 1150 ° C. The gas is indirectly heated by using gas, and the material is heated and calcined under flow. The temperature can be adjusted freely according to the product requirements, and can be produced continuously or intermittently. Meet the requirements of light magnesium oxide of all grades.
V. Economic data test
The double carbon reduction process simplifies the traditional carbonization process to different degrees according to the use of raw materials, shortens the process, eliminates high energy consumption and high pollution equipment, reduces investment, reduces production costs, and enhances magnesium oxide. Product market competitiveness. It solves the problem that the hot water can not be completely recycled in the traditional carbonization method. The main energy consumption indicators through actual production test are as follows; per ton of magnesia products: (1) coal consumption 2-3T/ton, (3 tons of dolomite, 2 tons of heavy magnesium); (2) power consumption is reduced compared with traditional processes 25%-50%, (3) 40%-50% reduction in production water, and all recycling.
Summary
The double-reduction carbonization process has mature production technology, low investment, low cost, and can be produced by different raw materials. It can produce different grades of magnesium oxide products, enhance market competitiveness, and meet the construction conditions of different regions and regions.
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