Calcium magnesium carbonate salt mine decomposition method

Abstract

The invention provides a calcium magnesium carbonate salt mine decomposition method which comprises the following steps: an ammonium salt solution is adopted to decompose calcium magnesium carbonate salt mine, the decomposition reaction is conducted in a series-connected multistage reactor or a tower-type reactor, heat carried by mixed gas generated by decomposition reaction of the ammonium salt solution and the calcium magnesium carbonate salt mine through heating are used as heat sources for recycling. According to the provided calcium magnesium carbonate salt mine decomposition method, through the introduction of the multistage countercurrent series-connected reaction kettle or the tower-type reactor, not only are the problems that a single-stage reaction kettle is large in water evaporation amount, the energy consumption is wasted, and ammonium carbonate is relatively low in concentration and unstable solved, but also the efficient and stable reaction of decomposition of the calcium magnesium carbonate salt mine by ammonium salt is realized, the energy consumption cost is reduced, and the method is energy-saving and economical.

Description

technical field [0001] The invention belongs to the field of chemical production, and relates to a method for decomposing calcium-magnesium carbonate ore, in particular to a method for decomposing calcium-magnesium carbonate ore by using ammonium salts. Background technique [0002] Carbonate minerals are widely distributed, among which calcium-magnesium carbonate minerals are the majority. The main forms of calcium magnesium carbonate include limestone and calcite mainly composed of calcium carbonate, magnesite mainly composed of magnesium carbonate, and dolomite containing both calcium carbonate and magnesium carbonate. At present, the utilization of carbonate mines is divided into two major directions. One is to directly purify the corresponding carbonates from carbonate mines and then obtain corresponding metal oxides, such as the production of magnesium carbonate, magnesium oxide, Light magnesium carbonate, calcium carbonate, calcium oxide, calcium hydroxide, etc.; the...

AI Technical Summary

Problems solved by technology

This method realizes the continuous progress of the reaction by controlling the temperature to steam the ammonia in the reaction system, but the big problem in this reaction is that the departure of ammonia is often accompanied by the departure of a large amount of water, which leads to two results, one The concentration of ammonia water obtained is low; the second is that a large amount of water needs to be evaporated to obtain quantitative ammonia, and the energy consumption of the reaction system cannot be effectively reduced

At the same time, this method also needs to add additional sulfuric acid and ammonium bicarbonate, which does not realize the full utilization of raw materials, causing waste and increasing production costs

Therefore, from the perspective of actual production, although the production method of ammonium salt decomposition of carbonate ore has certain feasibility in theory, it still cannot obtain a satisfactory industrial practice result.

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