Novel process for treating titanium dioxide processing waste sulfuric acid
A technology of titanium dioxide and waste sulfuric acid, which is applied in the direction of sulfur compounds, inorganic chemistry, non-metallic elements, etc., can solve the problems of high equipment investment and operating costs, pollution of groundwater resources and surface vegetation, and secondary pollution of the ecological environment. Effects of recycling, reducing decomposition temperature, and eliminating environmental pollution
Inactive Publication Date: 2019-05-14
罗丽斌
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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 against the original intention and threaten the company's reputation Survive
(3) The sulfur resources in the waste acid are not utilized, so that the sulfur is harmful to the environment in the form of waste residue
[0018] For the patent application for the three waste recycling method of sulfuric acid production of titanium dioxide with the application publication number CN102431975A, it directly adds the titanium dioxide waste slag green vitriol into a rotary kiln or a continuous frying pan reactor for reduction and decomposition to generate alumina slag and sulfur dioxide Gas, although the effect of recovering sulfur and aluminum resources in titanium dioxide waste slag has also been achieved, the purity of aluminum oxide obtained by reduction and decomposition is relatively low
Method used
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Experimental program
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Embodiment 1
[0069] Example 1 Recycling of Waste Slag and Waste Sulfuric Acid Produced by Sulfuric Acid Process
[0070] (1) Preparation and drying of aluminum sulfate
[0071] According to the production capacity, add titanium dioxide waste slag and waste sulfuric acid produced by the sulfuric acid method into the oxidation reaction kettle, mix well, and raise the temperature to 45°C. During the stirring process, slowly add H at the bottom of the kettle through the feeding pipe. 2 o 2 , H 2 o 2 Quickly oxidize the green vitriol in the titanium dioxide waste slag to aluminum sulfate, keep the solution concentration in the kettle acidic, take samples for analysis, and when the concentration of sub-aluminum drops to the specified concentration, stop the reaction, cool and crystallize, and filter to obtain aluminum sulfate.
[0072] Put the oxidized aluminum sulfate into the rotary kiln, and dry it at 120°C for 60 minutes under the atmosphere of nitrogen and argon to remove the crystal wat...
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Abstract
The invention relates to a novel process for treating titanium dioxide processing waste sulfuric acid, belongs to the field of three waste comprehensive utilization, and aims to provide a recycling method of waste residues and waste sulfuric acid generated in a titanium dioxide production process using a sulfuric acid method.
Description
technical field [0001] The invention relates to a novel process for treating waste sulfuric acid from titanium dioxide processing, which belongs to the field of comprehensive utilization of three wastes. Background technique [0002] Titanium dioxide material is a white inorganic pigment, which mainly has two crystal forms: anatase and rutile. Due to its superior density, dielectric constant and refractive index, it is considered to be the best white pigment in the world at present, and is widely used in industries such as coatings, plastics, papermaking, printing ink, chemical fiber and rubber. 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 increased from 290kt in 2000...
Claims
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IPC IPC(8): C01F7/02C01B17/50
Inventor 罗丽斌
Owner 罗丽斌