The invention discloses a vacuum rotary table filter and a filtering process, and belongs to the technical field of
titanium dioxide production, equipment advantages are utilized to monitor the content of residual
titanium in filtered
ferrous iron and the content of iron in
titanium liquid, and the filtering feeding amount and the washing
water flow are controlled through automatic
interlocking, so that the filtering efficiency is improved. The quality fluctuation of the titanium liquid caused by manual regulation and control of water quantity is reduced, and the cost is reduced and the efficiency is improved; a three-washing process is adopted, so that the influence on the concentration of the titaniferous solution is reduced while
ferrous separation is realized, and the dissolved amount of
ferrous in the titaniferous solution is reduced; ferrous
sulfate blocked in filter holes of the filter cloth is dredged by adopting a
compressed air back flushing method, so that continuous and high-efficiency
filtration is realized; by adding one or more scrapers and spray pipes matched with the scrapers, ferrous heptahydrate crystals are progressively washed, filtered and discharged one by one for multiple times in multiple
layers, so that the filtering effect is improved, the content of titanium entrained in ferrous
sulfate is reduced, the titanium yield is further improved, and the service life of filter cloth is prolonged.