Comprehensive utilization method for solid wastes and waste acid in production process of titanium dioxide
A production process and solid waste technology, applied in chemical instruments and methods, sulfur compounds, inorganic chemistry, etc., can solve secondary pollution and other problems, achieve the effects of saving production water, solving energy problems, and reducing pressure
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[0013] 1. Solid waste pretreatment
[0014] 1. Recycling of acidolysis waste residues: Collect the acidolysis residues to the residue recovery tank, add an appropriate amount of clean water (provided by the sewage treatment plant) and stir thoroughly, then send the diluted slurry to a plate and frame filter press for pressure filtration, and the filtrate It is a light titanium solution containing a certain amount of titanium sulfate and titanyl sulfate, all of which are reused after acidolysis. The waste residue after pressure filtration is used for secondary mixing and feeding to reduce the titanium content to below 15%, and then dried and crushed for later use.
[0015] 2. Ferrous sulfate pretreatment: dehydration of ferrous sulfate heptahydrate to produce ferrous sulfate monohydrate. Wash the ferrous sulfate heptahydrate with clean water to remove surface impurities in the cleaner first, filter to obtain pure ferrous sulfate heptahydrate, and then send it to the dissolutio...
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