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When the water partial separation titanate, in part of smaller particles of metatitanic acid through the filter layer and into the filtrate (i.e., the spent acid), and to improve the recovery rate must recover this metatitanic acid. A plurality of plastic rice settling tanks are generally used for sedimentation recovery. Although the equipment has poor sedimentation effect, the equipment is simple and easy to operate; some plants use polyacrylamide in the waste acid and then settle with a sloping plate settling tank. This kind of equipment has a fast settling speed, but if the control is not good, the settlement effect is also poor. The metatitanic acid recovered by sedimentation is returned to the water washing section and reused for washing.
There are two methods for recovering soluble titanium in spent acid.
1 Return the spent acid to acid hydrolysis and leaching so that the titanium in the spent acid remains in the next batch of titanium.
â‘¡ original Soviet practice, the spent acid in the phosphoric acid was added in an amount of 0.5kg 1kgTiO 2 plus phosphoric acid, phosphorus soluble titanium, generating a white precipitate of titanium phosphate. These precipitates were then added to the metatitanic acid and washed together. This can increase the yield of titanium dioxide by 1.1%, and the obtained titanium phosphate is white, which has no major influence on the quality of the product.