Ammonia-soda-combined-soda cyclic production process and application thereof

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-soda-hydrogen soda cyclic production process and its application in large-scale mine salt mining. Background technique [0002] Typical production process of mine salt figure 1 As shown, it includes: injecting fresh water into the salt well to produce saturated brine, then evaporation or vacuum evaporation to obtain solid salt, and produce salt mud as waste. This production process is liable to cause hidden geological hazards. [0003] The soda ash process is a basic part of the chemical industry. The soda ash production process is mainly the ammonia-soda process, the soda ash process and the trona process. The chemical synthesis soda process with many applications and large-scale production is the ammonia-soda process. Typical ammonia-soda alkali production process, as attached figure 2 Shown. [0004] In ammonia-soda production, 300-350kg of waste residue (dry basis) will be produced for every ton of soda ash produced, m...

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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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