A method for enriching scandium from titanium dioxide wastewater

Abstract

The invention discloses a method for enriching scandium from titanium white wastewater. The method comprises the six steps of primary extraction, primary reverse extraction, acid dissolution for impurity removal, secondary extraction, washing for titanium removal and secondary reverse extraction. The method for enriching the scandium from the titanium white wastewater achieves comprehensive scandium recycle, the scandium recovery rate is improved from below 50% to 83% or above, extraction and separation of scandium target element and impurities are achieved, the problems of scandium loss, entrainment, emulsification and the like of a traditional process are effectively solved, the coarse scandium purity is above 36%, organic phase, alkaline liquor and acid liquor can be recycled, chemical raw material consumption and pollutant discharge are reduced, and the production cost is reduced.

Description

technical field

[0001] The invention relates to a rare earth resource recovery technology, in particular to a method for enriching scandium from titanium white wastewater. Background technique

[0002] The rare earth element scandium (Sc) is an important strategic resource. There are basically no independent deposits of metal scandium in nature, and almost all of them are associated deposits. Scandium can be widely used in strong laser crystals, electronics, metal alloys, batteries, lighting and other industries. In recent years, the United States, Japan and other countries have made breakthroughs in the application technology of scandium-zirconium oxide electrolytes in solid oxide fuel cells (SOFC), which has promoted the demand for scandium and scandium-zirconium powders.

[0003] The production of titanium dioxide by the sulfuric acid method will produce a large amount of acidic wastewater. According to statistics, every 1 ton of titanium dioxide produced can produce 40-...