Method for recycling titanium dioxide waste acid
A technology for titanium dioxide waste acid and acid reduction, applied in the direction of iron sulfate, etc., can solve the problems of difficult product quality assurance, strict technical requirements, large equipment investment, etc., to achieve convenient production control and large-scale continuous production, no pollution to the environment, The effect of protecting the environment
Inactive Publication Date: 2018-11-20
XIANGYANG LOMON TITANIUM IND CO LTD
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Problems solved by technology
Some industrial developed countries such as the United States, Japan, and Italy often use vacuum or inert gas protection spray drying equipment for large investment, high dehydration costs, and strict technical requirements; due to restrictions on investment conditions such as funds, it was considered unsuitable for my country in the past. National conditions; also because of some misunderstandings in understanding, only one-sided emphasis on "economic production methods", resulting in many production methods with simple processes and simple equipment, and product quality is difficult to guarantee
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Embodiment 1
[0042] This embodiment includes the following process steps:
[0043] (1) Acid reduction of concentrated residue:
[0044] In the glass fiber reinforced plastic reactor, add 4m3 of mother liquor (iron content 7.18%, acid content 2.34%) produced by the precipitation and crystallization of ferrous sulfate monohydrate, and then add 6 tons of titanium dioxide waste acid with a particle size of 2-20μm under stirring. Concentrated slag (Fe16%, H2SO414%), mix the concentrated slag and mother liquor to make a slurry, control the specific gravity of the slurry to 1.2, raise the temperature to 60-70℃, turn on the fan, and then slowly add 320kg iron powder. The iron powder addition time is about 3h. After the powder reaction is over, add 2m3 of wet ferrous sulfate monohydrate mother liquor and maintain the temperature. At this time, the iron content of the slurry is 13.01% and the acid content is 3.96%.
[0045] (2), cooling crystallization, separation:
[0046] The acid-reduced slurry is tran...
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The invention relates to a method for recycling titanium dioxide waste acid. The method comprises the following processing steps: (1) impurity removal of titanium dioxide waste acid: adding a flocculating agent into titanium dioxide waste acid for impurity removal; (2) acid-degradation of concentrated slag after impurity removal: heating and concentrating the titanium dioxide waste acid after theimpurity removal, and mixing the concentrated slag with mother liquid produced by wet crystal transformation, pulping, and adding iron powder to reduce acid; (3) cooling and crystallizing a product ofthe step (2), cooling to room temperature, promoting ferrous sulfate monohydrate in the product of the step (2) to be converted into ferrous sulfate heptahydrate, and filtering to obtain ferrous sulfate heptahydrate; (4) adding the mother liquid produced by the wet crystal transformation into the product of the step (3), pulping, heating the liquid pulp to dissolve ferrous sulfate heptahydrate and precipitine ferrous sulfate monohydrate crystals, and separating immediately after the crystal transformation is completed, wherein the mother liquid is reused for pulping concentrated slag or ferrous sulfate heptahydrate, and a filter cake is dried to obtain ferrous sulfate monohydrate.
Description
Technical field [0001] The invention relates to a method for reusing titanium dioxide waste acid, in particular to a method for producing ferrous sulfate monohydrate from waste acid concentrated residue produced in the production process of sulfuric acid method titanium dioxide, and belongs to the technical field of titanium dioxide production . Background technique [0002] Titanium dioxide is widely used in paint, plastics, papermaking and other industries. At present, the annual output of titanium dioxide in China has exceeded 1 million tons. The process of producing titanium dioxide by sulfuric acid method using titanium concentrate as raw material is recognized as the world’s lowest-cost process for producing titanium dioxide. Route, using this process to produce 1 ton of titanium dioxide will produce 3-4 tons of ferrous sulfate heptahydrate by-products. If these by-products cannot be used effectively, it will pollute the environment and increase production costs, which is n...
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Login to View More IPC IPC(8): C01G49/14
CPCC01G49/14C01P2006/80
Inventor 彭本铃邓伯松胡海军古远明刘赢锐
Owner XIANGYANG LOMON TITANIUM IND CO LTD