With the rapid development of China’s economy, the consumption of magnesium oxide products will inevitably increase greatly, and extracting magnesium oxide from brine is both environmentally friendly and can reduce production costs. Hebei Messi Biology Co., Ltd. analyzes and introduces the process, advantages and disadvantages, and applicability of six methods for extracting magnesium oxide from brine. The brine method is mainly divided into six types: brine ammonia method, brine soda ash method, brine liquid alkali method, brine carbon ammonium method, brine calcium method, and magnesium chloride direct decomposition method.
Hebei Messi Biology Co., Ltd. compares various magnesium oxide extraction processes from the aspects of raw brine requirements, main raw material consumption, equipment, environmental protection, product purity, and current enterprise usage, points out the future development direction of brine magnesium oxide extraction process, and looks forward to the direction of China’s brine resource development.
Hebei Messi Biology Co., Ltd. uses salt lake brine as raw material and adopts the process of ammonia precipitation of magnesium-ammonium bicarbonate carbonization-calcination to prepare light magnesium oxide. The effects of ammonium bicarbonate excess coefficient, ammonium bicarbonate concentration, temperature and time on the carbonization process were studied to determine the optimal process conditions for preparing light magnesium oxide. The results show that the purity of the magnesium oxide product obtained by carbonization and calcination is greater than 99%, the S and B contents are reduced, the apparent specific volume is 10cm3/g, and the quality indicators are far better than the national standards for light magnesium oxide.
Hebei Messi Biology Co., Ltd. uses the brine of Xinjiang Lop Nur Salt Lake as raw material to establish a new process for preparing high-purity light magnesium oxide by ammonia precipitation-ammonium bicarbonate carbonization-calcination. At present, the main method for producing light magnesium oxide in China is the dolomite carbonization method, but the product of this method contains a high content of calcium oxide, and the content of magnesium oxide is generally less than 96%, and further purification will greatly increase the cost, and the equipment investment is large, which seriously affects the competitiveness of my country’s light magnesium oxide in the international market. Lop Nur Salt Lake is another large potash fertilizer (potassium sulfate) production base in my country after the Chaerhan Salt Lake in Qinghai. While producing potash fertilizer, a large amount of old brine rich in magnesium chloride and magnesium sulfate is discharged. If it is not used, it will have a serious impact on the ecology of the salt lake. Therefore, magnesium oxide mining and production can kill two birds with one stone.
Hebei Messi Biology Co., Ltd. pointed out that the process of producing magnesium oxide with brine is an earlier production method. However, the previous method has a long process flow, a large amount of auxiliary raw materials, and the production of greenhouse gas carbon dioxide is not conducive to environmental protection. The advent of advanced equipment has changed the traditional process, shortened the process flow, greatly reduced production costs, and improved product quality (the purity of magnesium oxide can reach more than 99%), bringing new opportunities for the production of magnesium oxide, which will greatly promote the development of the magnesium salt industry.