Treatment and recycling of waste acid---return to dilution water and leach water for titanium dioxide production
In the past, the treatment of waste acid was carried out by means of deep burial or dumping into rivers and lakes. The former Kronos company of the Federal Republic of Germany shipped the waste acid to the sea and released it. These methods are all negative. If they continue, they will inevitably cause public hazards.
When the acid hydrolysis of titanium iron ore with sulfuric acid, the sulfuric acid concentration required is diluted to 87% to 90%, instead of the dilution water with spent acid The clarified, concentrated sulfuric acid can be saved. When leaching, an appropriate amount of waste acid can be added to increase the F value, so that the stability of the titanium liquid is improved, and the early hydrolysis of the titanium liquid is prevented, which can also save the acidification by adding some concentrated sulfuric acid. In particular, when using a mine containing high ferric iron, it is necessary to use more iron scraps to reduce ferric iron into divalent iron. This process requires more sulfuric acid. If it is not supplemented with waste acid, it must be acid. When the solution is dissolved, the concentrated sulfuric acid can be solved, and the use of waste acid can solve the problem of saving concentrated sulfuric acid.
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