Production process for coproduction of iron oxide red and concentrated sulfuric acid

Abstract

The invention provides a process for producing ferric oxide red and concentrated sulfuric acid. Iron concentrate (or iron mud) and sulfur are taken as main raw materials and are mixed according to the proper proportion; then a proper amount of sulfuric acid is added for reaction to the required degree; then the materials are conveyed to a fluidized furnace for roasting; a ferric oxide red productis obtained through cooling down and crushing roasting slag; and furnace gas is dedusted, purified and converted for the second time to obtain a concentrated sulfuric acid product. The process takes sulfur as a heat source and produces the ferric oxide red product through a fluosolids roasting method. The production process has low production cost, high yield and good product quality, and fully and reasonably utilizes energy sources. The flue gas from roasting can be processed for preparing the concentrated sulfuric acid required by the market, thereby not only eliminating environmental pollution, but also making full use of sulfur resources. The production process turns the harmful into the beneficial, and has remarkable economic, environmental and social benefits.

Description

technical field [0001] The invention relates to a production process of iron oxide red and concentrated sulfuric acid in the chemical industry, and more specifically relates to a production process of iron oxide red co-producing concentrated sulfuric acid. Background technique [0002] At present, there are many manufacturing methods of iron oxide red, which can be generally divided into two categories: dry method and wet method. The dry methods include (1) green vitriol calcination method; (2) iron yellow calcination method; (3) iron black calcination method; (4) other dry methods. Iron oxide red is obtained by calcining iron-containing materials, such as iron mud and magnetite sand, at a suitable temperature. Wet methods include (1) sulfuric acid method; (2) mixed acid method. The general principle is to first react the iron sheet, iron filings and acid to form ferrous salt crystal seeds, then transfer the seed liquid into the two-step oxidation tank, add the iron sheet,...

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Problems solved by technology

The furnace gas generated by dry roasting contains a large amount of SO 2 Harmful components, if they are directly discharged into the atmosphere, it will seriously pollute the environment; there are also lime water to absorb the SO 2 Harmful components are then discharged into the atmosphere, although this solution reduces SO 2 Harmful components pollute the atmosphere, but at the same time, calcium sulfate waste residue is produced, which increases production costs

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