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Process for preparing ferric oxide red by adopting iron vitriol

A technology of ferrous sulfate and red iron oxide, applied in the direction of iron oxide, iron oxide/ferric hydroxide, sulfur compounds, etc., can solve the problem of indigestion of ferrous sulfate heptahydrate, unscaled industrial production, poor product pigment performance, etc. To solve the problem, to achieve the effect of reduced powder particle size distribution, low preparation cost and good product performance

Active Publication Date: 2013-11-06
HUNAN HENGGUANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The long-term stacking of ferrous sulfate heptahydrate will affect the surrounding environment. It can only consume a small amount of ferrous sulfate heptahydrate for the production of polyferric sulfate or wet preparation of ultra-fine iron oxide red, and a large amount of ferrous sulfate heptahydrate Difficult to digest
The products produced by this process still have the problems of poor pigment performance and high soluble salt content, and have not yet been mass-produced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] This implementation example is illustrated by treating 100,000 tons of ferrous sulfate heptahydrate per year to prepare superfine iron oxide red as an example.

[0069] The content of ferrous sulfate heptahydrate in the ferrous sulfate heptahydrate raw material is 91%, and the annual production practice is calculated by 8000 hours, and the ferrous sulfate heptahydrate processed per hour is 12.5 tons / hour, and the amount equivalent to ferrous sulfate monohydrate is 6.96 tons / hour; the amount of sulfur mixed in by 0.28 times the amount of ferrous sulfate monohydrate, the sulfur that needs to be mixed is 1.77 tons / hour; the output of iron oxide red is 3.25 tons / hour; the production of sulfur dioxide in the recovery furnace gas The amount of sulfuric acid was 9.6 t / h.

[0070] 1. Concentration of ferrous sulfate heptahydrate

[0071] Add ferrous sulfate heptahydrate into the four-effect evaporator, and use steam with a saturation pressure of 160°C to heat and concentrate. ...

Embodiment 2

[0086] This implementation example is illustrated by treating 50,000 tons of ferrous sulfate heptahydrate per year to prepare superfine iron oxide red as an example.

[0087] The content of ferrous sulfate heptahydrate is 91%, and the annual production practice is calculated by 8000 hours. The ferrous sulfate heptahydrate processed per hour is 6.25 tons / hour, and the amount of sulfur mixed is calculated by 0.22 times the amount of ferrous sulfate monohydrate. The sulfur to be mixed is 0.765 tons / hour; the output of iron oxide red is 1.66 tons / hour; the amount of sulfuric acid produced from sulfur dioxide in the recovery furnace gas is 4.68 tons / hour.

[0088] 1. Concentration of ferrous sulfate heptahydrate

[0089] Add ferrous sulfate heptahydrate into the four-effect evaporator, and use steam with a saturation pressure of 160°C to heat and concentrate. The first-effect evaporation temperature is 130°C; the second-effect evaporation temperature is 100°C; the third-effect eva...

Embodiment 3

[0104] This implementation example is illustrated by treating 80,000 tons of ferrous sulfate heptahydrate per year to prepare superfine iron oxide red as an example.

[0105] The content of ferrous sulfate heptahydrate in the ferrous sulfate heptahydrate raw material is 91%, and the annual production practice calculates by 8000 hours, and the ferrous sulfate heptahydrate processed per hour is 10.0 tons / hour; The amount equivalent to ferrous sulfate monohydrate is 5.56 tons / hour, the consumption of sulfur is mixed by 0.33 times of the amount of ferrous sulfate monohydrate, the sulfur that needs to be mixed is 1.84 tons / hour; the output of iron oxide red is 2.6 tons / hour; the production of sulfur dioxide in the recovery furnace gas The amount of sulfuric acid was 9.02 t / h.

[0106] 1. Concentration of ferrous sulfate heptahydrate

[0107] Add ferrous sulfate heptahydrate into the four-effect evaporator, and use steam with a saturation pressure of 160°C to heat and concentrate. ...

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Abstract

The invention provides a process for preparing ferric oxide red and recovering high-concentration sulfur dioxide burner gas for producing sulfuric acid or sulfite by taking iron vitriol and sulfur as raw materials, and adopting processes such as preparing ferrous sulfate monohydrate through concentration of iron vitriol, conducting superfine treatment on ferrous sulfate monohydrate, calcining, dust separating, and secondary dust calcining. The process provides a new technical way for preparing ferric oxide red paint by taking iron vitriol which is solid waste as a raw material, so as to effectively solve the problem that the iron vitriol which is a by-product of titanium white preparation adopting a sulfuric acid method is difficult to digest, has an important meaning in the development of the ferric oxide red industry, is suitable for large industrialized continuous production, and has the advantages that the preparation cost is low, the performance of the ferric oxide red product is high, and the dispersivity and the tinting strength of the product are higher than those of a ferric oxide red product prepared according to a classic method (namely the wet method).

Description

technical field [0001] The invention discloses a process for preparing superfine iron oxide by using ferrous sulfate heptahydrate, which belongs to the technical field of general pigment chemical preparation process. technical background [0002] China is a big producer of iron oxide red series pigments. In 2011, the domestic output of iron oxide red series pigments exceeded 800,000 tons. At present, iron oxide red in China is generally prepared from iron sheet or iron filings, and is prepared by wet oxidation process. Iron red with better pigment performance is generally prepared by using ferrous sulfate heptahydrate as raw material. The preparation of iron oxide red series pigments by using ferrous sulfate heptahydrate requires dissolving and refining ferrous sulfate heptahydrate and then neutralizing it with ammonia water. A large amount of calcium sulfate solid waste is produced in the process, and a large amount of steam is consumed at the same time, and the preparatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/06C01B17/50
Inventor 曾维兴
Owner HUNAN HENGGUANG CHEM