Hebei Messi Biology Co., Ltd. stated that the main magnesium-containing minerals on the earth include magnesite, spar and dolomite. In the traditional industry, basic magnesium carbonate is mainly produced from these ores as raw materials. The main production methods are: dolomite carbonization method, magnesite ammonium carbonate method, bitter soil powder-sulfate-ammonium bicarbonate method, etc.
The specific chemical process of the dolomite carbonization method is to mix dolomite with an MgO content of more than 17% and anthracite in a ratio of [(8~10):1], place it in a kiln, and calcine it at 1000~1200°C to obtain dolomite. Clinker: In the digestion tank, under stirring conditions, the waste liquid in the reaction is used to directly digest the massive dolomite into gray milk. After reaching a certain concentration, it is sent to the carbonation tower and processed with the washed and purified carbon dioxide from the lime kiln. Carbonation; a gas distribution device is installed at the lower part of the tower to allow the gas to enter the tower evenly; the carbonated liquid enters the clarification tank for clarification to obtain heavy magnesium water clear liquid, and the remaining mud is washed with an appropriate amount of clean water to recover the effective magnesium (MgO) and then send it It is filtered through the plate and frame filter, and the filter cake calcium carbonate is discarded; the clarified heavy magnesium water and filtrate are sent to the heavy magnesium water storage tank and pumped into the tubular pyrolyzer, where it is directly heated by steam to pyrolyze to generate basic magnesium carbonate.
The bitter soil powder-sulfate-ammonium bicarbonate method is to hydrolyze magnesium-containing minerals such as bitter soil powder with sulfuric acid, filter, and refine to obtain a magnesium sulfate solution, which is then subjected to a metathesis reaction with ammonium bicarbonate. After the reaction is completed, the slurry is pyrolyzed, separated, Medicinal magnesium carbonate is prepared through drying and other procedures.
Hebei Messi Biology Co., Ltd. stated that the above two methods are currently commonly used in the domestic production of basic magnesium carbonate. However, these traditional methods have higher production costs, long process flows, large equipment, complicated processes, large investments, and poor product quality. It is difficult to control, and the industrial “three wastes” pollution caused during the production process is serious, and the impurity content of the obtained products is high, and it also involves a series of problems such as the collection and processing of ores. Therefore, in recent years, people have increasingly More and more attention is paid to using liquid magnesium salt as raw material to prepare magnesium products.