Abstract:

Titanium gypsum is an industrial solid waste formed in the production process of titanium dioxide by using lime and titanium white waste acid as raw materials.At the same time,since titanium gypsum contains a variety of valuable metal elements,it is also an important secondary resource with the recycling and utilization value.The titanium gypsum was leached with hydrochloric acid to recover valuable metal elements,thereby realizing the comprehensive utilization of titanium gypsum. The effects of hydrochloric acid concentration,leaching temperature,leaching time and liquid-solid mass ratio on the leaching effect were studied.The experiment results showed that the leaching rate of metallic iron was above 90% under the conditions,such as the mass fraction of hydrochloric acid of 15%,the leaching time of 60 min,the leaching temperature of 90 ℃ and the liquid-solid ratio of 6∶1.The treatment technology has the advantages of easy process and low treatment cost,and it provides a new process for the utilization of titanium gypsum.

Key words: titanium white waste acid, titanium gypsum, hydrochloric acid leaching