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Internal circulation of waste and by-products of sulfuric acid titanium dioxide factory
"Waste, emissions of sulfuric acid method titanium white powder factory is not only very large, processing means investment and operating costs are high, although there are many ways of utilization, but to all utilization, then it will work far more than the titanium dioxide itself the scale of production, factories are generally unable to bear in terms of technology, or funds, in 1994 the British tonnage of titanium dioxide Group (Tiox-ide) comprehensive utilization of products up to 58x10 4 t, exceeding the company's titanium dioxide production, and large Some of the comprehensively utilized products have low added value, low margins, and even loss-making operations, which increase the cost burden of many titanium dioxide factories.
In order to do a good job in the "three wastes" governance and comprehensive utilization of titanium dioxide factories, we must conscientiously do a good job in the selection of new plants in the future and the adjustment of the old factory management structure. The future of titanium dioxide sulfuric acid plant was built in the best sulfuric acid plant, most of the former Soviet Union is a titanium dioxide sulfuric acid plant - titanium dioxide - phosphorus fertilizer - a joint venture of iron oxide pigments, titanium dioxide, the main raw material such sulfuric acid plants can make the best The waste acid (concentrated waste acid) can be supplied to the phosphate fertilizer plant to produce phosphate fertilizer; the ferrous sulfate can not only be mixed with pyrite to produce sulfuric acid, but also can produce iron oxide pigment and iron catalyst for fertilizer; the waste heat of sulfuric acid plant can supply titanium White powder production or concentrated waste acid, so that most of the waste in the titanium dioxide factory can be recycled and reused within the company.
China's Beijing Research Institute of Nonferrous Metals recently proposed a set of ideas for improving and strengthening the production process of titanium dioxide in combination with the “three wastes†governance problem in China's titanium dioxide industry. Their argument is to reduce the “three wastes†emissions of the factory. Acid-soluble titanium slag with a TiO 2 content of about 80%, hydrolyzed coconic acid is enriched with ilmenite by the "Ishihara method"; artificial rutile is produced for use in a chlorination plant, enriching the filtrate in the process of artificial rutile, and freezing Crystallization recovers ferrous sulfate for the production of polymeric ferric sulfate or for sale. According to this process (see the figure below), the yield of titanium dioxide is 80%, and the sulfuric acid waste liquid discharged by the acid waste gas, waste residue and water washing can be reduced by 1/3 per ton of titanium dioxide. ~1/2, the production capacity of the black section can be increased by 35%~40%.