Method for fixing CO2 in industrial waste gas by using calcium-based bulk industrial solid waste phosphogypsum through strengthening and carbonating

Abstract

The invention discloses a method for fixing CO2 in industrial waste gas by using calcium-based bulk industrial solid waste phosphogypsum through strengthening and carbonating. The method comprises the following steps of: firstly, washing phosphogypsum with hot water to remove water-soluble impurities; secondly, adding the phosphogypsum cleaned in the first step in ammonia water for carrying out alkali-dissolved reaction to leach part of calcium ions; thirdly, adding a solid-liquid mixer generated in the second step into an airtight reactor, introducing CO2 waste gas for carrying out a gas-liquid-solid multi-phase CO2 carbonated fixing reaction to generate a calcium carbonate crystal, filtering, separating, washing and drying to obtain crystalline calcium carbonate; and fourthly, adding crystallized mother solution obtained in the third step in sulfuric acid and neutralizing to neutral and carrying out evaporating, concentrating, slurry spraying and granulating, drying and screening to obtain a granular ammonium sulfate product. According to the method disclosed by the invention, two valuable products are generated by using two wastes, so that the production cost of raw materials is reduced and the value of products is improved; and the method has the advantages of easiness in industrialization, better economic benefit, social benefit and industrial application prospect.

Description

technical field [0001] The invention belongs to an enhanced carbonation to fix CO in industrial waste gas 2 The method, especially relates to a calcium-based bulk industrial solid waste phosphogypsum enhanced carbonation to fix CO in industrial waste gas 2 Methods. Background technique [0002] CO 2 It is the most important gas causing the greenhouse effect, accounting for about 2 / 3 of the greenhouse gases. In recent years, with the consumption of a large amount of fossil fuels, atmospheric CO 2 The rapid increase, the resulting greenhouse effect, global warming, has gradually attracted widespread attention from the international community. by CO 2 Source emission reduction and stationary storage are the reduction of CO in the atmosphere 2 important pathway, yet accounts for human CO 2 Fossil fuels with 3 / 4 of the total emissions have been the preferred fuels adopted by countries around the world for a long time, at least until the middle of the 21st century, so CO 2...

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Problems solved by technology

[0008] Among the above process routes, the direct dry process has a slow reaction process, harsh reaction conditions, and low conversion rate. The direct wet process requires a large amount of ore mining, and the energy consumption of ore processing is high, which will cause environmental problems. The indirect route has energy consumption for media reuse. High, corrosive and other defects, in short, the existing process technology has the problems of high economic cost and difficulty in industrialization