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Production technology of sulfuric acid by gypsum transformation decomposition method

A decomposition method, sulfuric acid technology, applied in chemical instruments and methods, inorganic chemistry, sulfur compounds, etc., can solve the problems of low single-pass conversion rate of reactants, complex production procedures, low production efficiency, etc., and achieve improved one-pass conversion of reactants. efficiency, overcoming many processes, and improving work efficiency

Inactive Publication Date: 2016-06-01
赵建英
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Problems solved by technology

In the current synthetic method for producing sulfuric acid, the technological process is not easy to implement, the purity of the generated sulfuric acid is low, the single-pass conversion rate of the reactant is low, the production process is complicated, the production efficiency is low, and the environmental pollution is serious.

Method used

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Embodiment

[0013] The gypsum conversion decomposition method of the present embodiment produces sulfuric acid technology, comprises the following steps:

[0014] (1) At room temperature, use the water washed with the previous batch of calcium carbonate to absorb the previous batch of reaction (3) and then absorb the raw material carbon dioxide or add the raw material ammonium bicarbonate to dissolve to form an ammonium carbonate solution, that is, reaction (1): 6NH3+3CO2 +3H2O→3(NH4)2CO3, or 6NH3+3NH4HCO3→3(NH4)2CO3;

[0015] (2) Add the raw material gypsum powder to the ammonium carbonate solution, and react at room temperature with stirring, that is, reaction (2): 3(NH4)2CO3+3CaSO4→3CaCO3+3(NH4)2SO4;

[0016] (3) Filtration and separation, the filter residue calcium carbonate is washed with water to become a by-product, the filtrate is ammonium sulfate solution, add excess iron oxide powder, first stir and heat to dry, then continue to heat and keep at 300°C and react under stirring, t...

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Abstract

The invention discloses a production technology of sulfuric acid by a gypsum transformation decomposition method. Gypsum is transformed into ammonium sulfate which is easy to decompose; ammonium sulfate is decomposed to directly obtain sulfur trioxide; and sulfur trioxide is absorbed with water or dilute sulphuric acid so as to prepare sulfuric acid. Ardealite, which is used as a raw material, doesn't have to undergo any pretreatment and directly reacts to obtain calcium carbonate which is a main raw material for production of cement. Therefore, dangerous waste ardealite generated from phosphorus chemical industry can be eliminated in quantity, and the main raw material sulfuric acid which is essential to phosphorus chemical industry is obtained so as to realize cycling of sulfur. During the whole process, ''three wastes (waste gas, waste water and industrial residue)'' are not discharged, and secondary pollution is not generated at all. Actually consumed raw materials are only gypsum and carbon dioxide, thus reducing the greenhouse gas carbon dioxide and improving the environment. Required investment is little, and the technology has remarkable economic benefit.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a process for producing sulfuric acid by a gypsum conversion and decomposition method. Background technique [0002] The production process of sulfuric acid by gypsum conversion and decomposition method includes at least basic processes such as catalysis, batching, reaction, and impurity removal. In the current synthetic method for producing sulfuric acid, the technological process is not easy to implement, the purity of the generated sulfuric acid is low, the single-pass conversion rate of the reactant is low, the production process is complicated, the production efficiency is low, and the environmental pollution is serious. Contents of the invention [0003] In order to overcome the above-mentioned technical problems existing in the prior art field, the object of the present invention is to provide a process for producing sulfuric acid by gypsum conv...

Claims

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Application Information

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IPC IPC(8): C01B17/74
Inventor 赵建英
Owner 赵建英
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