Production technology of sulphuric acid

Abstract

The invention discloses a production technology of sulphuric acid. The production technology of sulphuric acid comprises the following technological steps: (1) smashing and screening, namely selecting iron pyrite from ore and smashing, sieving and selecting appropriate iron pyrite granules with the granularity of 4-5mm; (2) roasting; (3) purifying; (4) recycling reaction heat, wherein a steam evaporation pipe bundle is arranged in a waste heat boiler, reaction heat obtained during furnace gas cooling is conveyed to a water circulation system or other thermodynamic systems through the steam evaporation pipe bundle; (5) drying; (6) carrying out conversion, wherein gas enters a conversion system through a sulphur dioxide blower, and sulphur dioxide in raw furnace gas is oxidized into sulphur trioxide gas in the presence of a vanadium catalyst; and (7) absorbing. The production technology of sulphuric acid is reasonable and simple in technology, a technological process is greatly shortened, raw materials are fully utilized, less pollutant is discharged, most importantly recovery rate of low temperature waste heat in the sulphuric acid making industry is increased, and waste of energy resources and the like is avoided, so that the production technology of sulphuric acid is applicable to popularization in the sulphuric acid production industry.

Description

technical field [0001] The production technology of the chemical medicine that the present invention relates to, particularly relates to a kind of sulfuric acid production technology. Background technique [0002] Sulfuric acid has a wide range of uses, such as chemical fertilizers, explosives, pesticides and medicines. Sulfuric acid is needed in China. As a large country of sulfuric acid, the production and consumption of sulfuric acid continue to grow. As a technologically strong country, there is a great potential for recovery and utilization of waste heat in pyrite acid production industry, but there is no effective and feasible technology and equipment to recover this part of energy in the current sulfuric acid production process. The application number is CN200810232687.6, which discloses a sulfuric acid production process. It uses iron fine powder (or iron mud) and sulfur as the main raw materials, mixes iron fine powder (or iron mud) and sulfur in an appropriate prop...

AI Technical Summary

Problems solved by technology

The process uses sulfur as a heat source, and adopts boiling roasting dry method to produce iron oxide red products. The roasted flue gas is processed into concentrated sulfuric acid products required by the market, which not only eliminates environmental pollution, but also makes full use of sulfur resources. It is beneficial, with significant economic, environmental and social benefits, but its utilization rate of low-temperature waste heat is extremely low, which is not conducive to the utilization of resources, and the waste is also great. At the same time, most sulfuric acid production processes have unclear temperature control and cooling technology Good, it is easy to cause equipment damage, reduce the service life of the equipment, and increase the process cost