Method for recovering and utilizing three wastes during titanium white production through sulfuric acid process

A technology of titanium dioxide and sulfuric acid method, which is applied in the direction of sulfur trioxide/sulfuric acid, calcium/strontium/barium sulfate, ferrous oxide, etc., which can solve the problems of polluting groundwater resources and surface vegetation, secondary pollution of the ecological environment, violations, etc. , to reduce the reduction and decomposition temperature, eliminate environmental pollution, and shorten the production cycle

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

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Problems solved by technology

Although this method can reduce waste acid pollution, it also brings the following problems: (1) because the neutralization slag mainly contains CaSO 4 , Fe(OH) 3 , Mg(OH) 2 Wait, at present, we can only discard the pile for processing
After being washed by rainwater, it seeps into the land and farmland, pollutes groundwater resources and surface vegetation, and causes serious irreversible secondary pollution to the ecological environment
(2) Equipment investment and operating costs are high, which can only be passed on to consumers by increasing product prices in the end, thereby affecting the competitiveness of enterprises; the resulting secondary pollution will inevitably cause bitter results that go agai

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0036] Example 1

[0037] (1) Reductive decomposition of titanium white waste residue and green vitriol and treatment of higher concentration of waste sulfuric acid

[0038] Add titanium dioxide waste residue and green vitriol into a rotary kiln or continuous wok reactor, and dry it at 120℃ for 60 minutes under nitrogen and argon atmosphere to remove the crystal water in the titanium dioxide waste residue, and control the total temperature and time by adjusting the drying temperature and time. Water is divided into 5%, the flue gas is emptied after dust removal and purification, and the dried material enters the next step of reaction;

[0039] Use sulfur in nitrogen and oxygen to reduce and decompose the anhydrous titanium dioxide waste into FeO residue and SO at a temperature of 500℃ 2 gas. Use SO 2 The sulfuric acid produced by the gas is returned to the acid hydrolysis process in the titanium dioxide production process. The decomposed FeO residue directly neutralizes the 10% was...

Example Embodiment

[0044] Example 2

[0045] (1) Reductive decomposition of titanium white waste residue and green vitriol and treatment of higher concentration of waste sulfuric acid

[0046] Add titanium dioxide waste residue and green vitriol into a rotary kiln or continuous wok reactor, and dry it at 400℃ for 5 minutes under nitrogen and argon atmosphere to remove the crystal water in the titanium dioxide waste residue. Control the total drying temperature and time by adjusting the drying temperature and time. Water is divided into 5%, the flue gas is emptied after dust removal and purification, and the dried material enters the next reaction;

[0047] Use high-sulfur coal in carbon dioxide and oxygen to reduce and decompose anhydrous titanium dioxide waste residue into FeO residue and SO at a temperature of 1000℃ 2 gas. Use SO 2 The sulfuric acid produced by the gas is returned to the acid hydrolysis process in the titanium dioxide production process. The decomposed FeO residue directly neutrali...

Example Embodiment

[0052] Example 3

[0053] (1) Reductive decomposition of titanium white waste residue and green vitriol and treatment of higher concentration of waste sulfuric acid

[0054] Put the titanium white waste slag green vitriol into the rotary kiln or continuous wok reactor, and dry it at 300℃ for 30 minutes under nitrogen and argon atmosphere to remove the crystal water in the titanium white waste slag, and control the total drying temperature and time by adjusting the drying temperature and time. The water content is 2.5%, the flue gas is emptied after dust removal and purification, and the dried material enters the next reaction;

[0055] Use sulfur in nitrogen and oxygen to reduce and decompose anhydrous titanium dioxide waste into FeO residue and SO at a temperature of 800°C 2 gas. Use SO 2 The sulfuric acid produced by the gas is returned to the acid hydrolysis process in the titanium dioxide production process. The decomposed FeO residue directly neutralizes the 20% waste H genera...

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Abstract

The invention discloses a method for recovering and utilizing three wastes during titanium white production through a sulfuric acid process, which is characterized in that crystal water is removed from titanium white waste slag copperas, anhydrous titanium white waste slag is reduced and decomposed into ferrous oxide residue and sulfur dioxide gas by reducing agents in weak oxidization mixing atmosphere at high temperature, sulfuric acid prepared by sulfur dioxide gas returns the acidolysis work procedure in the titanium white production process, the decomposed ferrous oxide residue is directly used for neutralizing the 10 to 25 weight percent waste sulfuric acid generated in the titanium white production process, excessive ferrous oxide residues can be used as raw materials for producingferric oxide series pigments and for steel plants, crystal water is removed from titanium white waste slag red gypsum, semihydrated gypsum is obtained, the semihydrated gypsum is reduced and decomposed into calcium oxide residue and sulfur dioxide gas by reducing agents in weak oxidization mixing atmosphere at high temperature, the sulfur dioxide gas can be used for preparing sulfuric acid, ferrous waste water and 0.1 to 10 percent waste sulfuric acid are neutralized by calcium oxide residues or quick lime, ferrous red gypsum is obtained through filtering, and the filter liquid can be reused.

Description

technical field [0001] The invention relates to a three-waste recycling method for producing titanium dioxide by a sulfuric acid method, and belongs to the technical field of three-waste 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, materials, 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 of titanium dioxide increase...

Claims

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Application Information

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IPC IPC(8): C01B17/69C01G49/04C01F11/46
Inventor 陈晓东杨林张志业王辛龙
Owner SICHUAN UNIV
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