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Method for recovering sulfur and iron resources through reducing and decomposing titanium white waste slag green vitriol by sulfur

A technology for recovering sulfur and titanium dioxide, which is applied in separation methods, sulfur trioxide/sulfuric acid, chemical instruments and methods, etc. It can solve the problems of low iron grade in sulfuric acid slag, difficulties in ironmaking, increased difficulty in fluidized fluidized furnace temperature control, etc. problems, to achieve the effect of easy promotion, obvious energy saving effect and easy control

Active Publication Date: 2012-05-02
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the incorporation of waste slag makes it more difficult to control the temperature of fluidized fluidized furnace, and the iron content of sulfuric acid slag is still low, which is difficult to meet the requirements of ironmaking

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Drying and dehydration of titanium dioxide waste slag vitriol

[0037] Put the titanium dioxide waste slag green vitriol into the rotary kiln reactor, and dry it at 120°C for 40 minutes under nitrogen and argon atmosphere to remove the crystal water in the titanium dioxide waste. The total moisture content of the material is 5%, and the flue gas is dedusted and purified. After emptying, the dried material enters the next step of reaction.

[0038] (2) Sulfur reduction and decomposition of dried titanium dioxide waste residue

[0039] The first section: Add the above-mentioned dried titanium dioxide waste slag into a reactor at a temperature of 200°C, and in nitrogen, argon and SO 2 Under the atmosphere, gaseous sulfur with a mole fraction of 50% was introduced to carry out reduction reaction with titanium dioxide waste residue for 3 hours to obtain ferrous sulfide residue, and the produced SO 2 Tail gas is used to produce sulfuric acid by two-turn and two-absorpti...

Embodiment 2

[0043] (1) Drying and dehydration of titanium dioxide waste slag vitriol

[0044] Put titanium dioxide waste slag green vitriol into the rotary kiln reactor, and dry at 400°C for 5 minutes under nitrogen atmosphere to remove the crystal water in the titanium dioxide waste. The total moisture content of the material is 5%, and the flue gas is emptied after dust removal After drying, the material enters the next step of reaction.

[0045] (2) Sulfur reduction and decomposition of dried titanium dioxide waste residue

[0046] The first section: Add the above-mentioned dried titanium dioxide waste slag into the reactor at a temperature of 700°C, 2 Under the atmosphere, gaseous sulfur with a mole fraction of 1% was introduced to carry out reduction reaction with titanium dioxide waste residue for 0.1h to obtain ferrous sulfide residue, and the produced SO 2 Tail gas is used to produce sulfuric acid by two-turn and two-absorption process.

[0047]The second section: Grind the fer...

Embodiment 3

[0050] (1) Drying and dehydration of titanium dioxide waste slag vitriol

[0051] Put titanium dioxide waste slag green vitriol into the rotary kiln reactor, dry at 300°C for 35 minutes under nitrogen atmosphere, remove the crystal water in the titanium dioxide waste, the total moisture content of the material is 0.1%, and the flue gas is emptied after dust removal After drying, the material enters the next step of reaction.

[0052] (2) Sulfur reduction and decomposition of dried titanium dioxide waste residue

[0053] The first section: Add the above-mentioned dried titanium dioxide waste slag into the reactor at a temperature of 600°C, 2 Under the atmosphere, gaseous sulfur with a mole fraction of 30% was introduced to carry out reduction reaction with titanium dioxide waste residue for 1.5 hours to obtain ferrous sulfide residue, and the produced SO 2 Tail gas is used to produce sulfuric acid by two-turn and two-suction processes.

[0054] The second working section: Af...

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Abstract

The invention discloses a method for recovering sulfur and iron resources through reducing and decomposing titanium white waste slag green vitriol by sulfur, which is characterized in that firstly, the titanium white waste slag green vitriol is dried for 5 to 40 minutes at 120 to 400 DEG C in inert atmosphere, crystal water in the titanium white waste slag is removed, then, the dried titanium white waste slag is added into a reaction vessel with the temperature being 200 to 700 DEG C, gaseous sulfur with the mold percentage being 1 to 50 percent is introduced in the reducing mixed atmosphere to take reduction reaction with the titanium white waste slag for 0.1 to 3 hours, the obtained ferrous sulfide residue is mixed with effective ingredients of ferrous sulphate in the anhydrous titaniumwhite waste slag according to a mol ratio of 0.2 to 2:3, the materials are roasted for 0.1 to 4 hours in the weak oxidizing atmosphere at the temperature being 500 to 1000 DEG C through being uniformly ground, the generated sulfur dioxide tail gas returns the first work station, the brought heat is used for the reaction of the first work station, and the obtained solid slag materials can replace the lime for directly neutralizing the titanium white waste acid and the acid waste gas or can be used as raw materials for producing ferric oxide series pigments and for steel plants.

Description

technical field [0001] The invention relates to a method for recycling sulfur and iron resources by reducing and decomposing titanium white waste slag green vitriol, and belongs to the technical field of three wastes treatment and comprehensive utilization. Background technique [0002] Titanium dioxide is a high-grade high-quality white pigment and an important inorganic chemical product. It is chemically stable with high refractive index and ideal particle size distribution. Therefore, with its good hiding power and tinting power, it is widely used in industries such as coatings, inks, plastics, rubber, paper, ceramics and synthetic fibers. With the continuous development of the economy, the demand for titanium dioxide continues to increase. Since 2000, my country has completed the localization of large-scale titanium dioxide devices and equipment in China, and the titanium dioxide industry is developing rapidly towards large-scale and large-scale production. The output...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/69C01G49/06B01D53/81B01D53/40
Inventor 杨林张志业王辛龙陈晓东
Owner SICHUAN UNIV
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