A kind of ammonia alkali-combined alkali cycle production process and its application

Abstract

The invention relates to a process of ammonia-soda-combined-soda cyclic production for sodium chloride, sodium carbonate, liquid ammonia, ammonium chloride, calcium chloride and calcium carbonate. The process comprises the following steps: using brine, carbon dioxide and acetylene sludge as raw materials for producing sodium carbonate by an ammonia-soda method, injecting the generated waste liquid in a salt well and extracting brine, leaving and storing the calcium sulphate generated after nitrate removal and the injected soda sludge in the salt well, conveying the extracted brine into a salt calcium co-production device, producing a solid salt, reacting a part of the remainder solution with sodium carbonate to produce calcium carbonate, using a part as liquid calcium chloride, and evaporating the other part to produce calcium chloride dehydrate; using the obtained solid salt, ammonia and carbon dioxide as raw materials for producing sodium carbonate and ammonium chloride by a combined-soda method; adding wet ammonium chloride in the ammonia-soda waste liquid and decomposing. According to the process, the efficiency and yield of cyclic production are increased, and environmental pollution is reduced; the purities of sodium carbonate, calcium carbonate, ammonium chloride and solid salt are up to 99.0%, 99.9%, 99.5% and 95% respectively, the content of solid calcium is 74%, liquid calcium can be optimally configured, and the particle size of calcium carbonate is nanometre-submicron order.

Description

technical field [0001] The invention relates to an ammonia-alkali-combined alkali cycle production process and its application in large-scale mine salt mining. Background technique [0002] The typical well mine salt production process is as follows: figure 1 As shown, it includes: injecting fresh water into the salt well to produce saturated brine, then evaporating or vacuum evaporating to obtain solid salt, and producing salt mud as waste. This production process can easily lead to geological hazards. [0003] The soda ash process is the basic part of the chemical industry. Soda ash production processes are mainly ammonia-soda process, combined soda process and trona process. The chemical synthesis soda process with many applications and large-scale production is the ammonia-soda process. The typical ammonia-soda alkali production process, such as attached figure 2 shown. [0004] In the production of ammonia-soda method, every ton of soda ash produced will produce 30...

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Problems solved by technology

[0010] None of the above-mentioned patent documents discloses a combined and cyclic production process of ammonia soda, salt calcium, and combined soda, and solves the problem that in the combined production process, due to the large site, the cyclic production is difficult, and after multiple mining, the geological landslides are easy to cause. Waste of resources, environmental pollution caused by waste liquid and residue in the production process, and problems such as improving product output and purity

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