Application of Ceramic Membrane Equipment in Titanium Dioxide Production

In the process of producing nanoscale ultrafine titanium dioxide by wet chemical methods (sulfuric acid method, chlorination method, hydrochloric acid method), it is necessary to wash the titanium dioxide slurry rich in impurity ions to improve the purity of the titanium dioxide. Unlike traditional plate and frame filtration and centrifugal separation, ceramic membranes mainly use cross flow filtration in solid-liquid separation.

Ceramic membrane equipment is applied in the washing process of titanium dioxide. Under pressure and high flow rate, the titanium dioxide slurry continuously circulates on the circulation side, and the membrane surface can trap titanium dioxide particles while allowing impurity ions in the solution to permeate through the membrane pores. Due to the continuous flushing of the membrane surface by the feed solution, material accumulation is not formed, which greatly reduces the filtration resistance. Therefore, a high permeation flux can be maintained at lower pressures, allowing the filtration operation to be carried out continuously for a relatively long time.

The application process characteristics of ceramic membrane equipment in the production of ultrafine nano titanium dioxide powder:

1) High filtration accuracy, high retention rate for ultrafine titanium dioxide, and easy operation;

2) Good cleaning effect, can prepare titanium dioxide with a purity greater than 99.5%; 3) The water does not contain titanium dioxide particles, resulting in minimal pollution when discharged;

4) Less water washing can save more than 30% of cleaning water; 5) The main body of the equipment is made of stainless steel or anti-corrosion composite materials, with few vulnerable parts and simple equipment maintenance;

6) The process is stable and the product quality is easy to control.