Research On Desulfurization Efficiency Of Magnesium Residues

China has abundant dolomite resource. The magnesium industries smelt magnesium by Pidgeon method. With the large increase of the need for magnesium and magnesium alloy in international market, many magnesium factories by Pidgeon method have been established in China. With the production of magnesium, the large quantity magnesium residues have been produced. The magnesium residues is not utilized rationally, which brings seriously environmental pollution.Magnesium residues contain a large amount of calcia. By comparing all sorts of desulfurization technology in this paper, it can be used in CFBC. An appropriated method may be found to solve dust problem and sulfur dioxide pollution by disposing waster.Based on several main factors affecting desulfurization efficiency, desulfurization characters are tested by selected apparatus. For example, the component of magnesium residues is measured by ICP-AES. Desulfurization efficiency curve is gained by TGA under different temperature, different particle size and different oxygen content condition. Specific surface area and pore volume for magnesium residues and desulfurization product are analyzed by nitrogen adsorption instrument. Microform of magnesium residues and desulfurization product is observed by SEM.The experiment results indicate that the mass percent of calcia is about 55%. The utilization ratio for magnesium residue is enhanced with the increase of temperature and oxygen content. However, decreasing the pore size leads to the enhancement of the utilization ratio for magnesium residue. Analyzing the trial datas, the author found that desulfurization efficiency of water-treated magnesium residue is much better than that of magnesium residue.By nitrogen adsorption instrument, the thesis test specific surface area and pore volume for magnesium residue, its desulfurization product, water-treated magnesium residue and its desulfurization product. Trial datas indicate that have increased obviously after water-treatment. It means that specific surface area and pore volume can affect obviously desulfurization efficiency. Observing magnesium residue and its desulfurization product by SEM, calcium sulphate is created on the surface of desulfurization product.The experiment datas suggest that magnesium residues may be used in CFBC. The desulfurizing efficiency of magnesium residues isn't better than that of limestone because specific surface area and pore volume for magnesium residues are small. If the magnesium residues is used for desulfurizing, the specific surface area and pore volume of magnesium residues must be activated and increased.If the desulfurization efficiency of magnesium residues is enhanced, not only environmental pollution is solved, but also much cheaper desulfurizer is found.