Method of flotation desulfur desilicon in bauxite

Abstract

A floatation process for bauxite to remove S and Si includes such steps as grinding the crude bauxite, adding the yellow catching agent B, reverse floatation for removing S, grinding, adding the match of saponified fatty acid and naphthenic acid, and forward floatation. The resultant bauxite concentrate can be used to prepare aluminum oxide by Bayer method.

Description

technical field

[0001] A bauxite flotation desulfurization and desiliconization method relates to a bauxite flotation method, in particular to a method for desulfurization and desiliconization of sulfur-containing low-grade bauxite. technical background

[0002] Bauxite is the main raw material for the aluminum industry, and it is also an important raw material for the production of refractory materials, high-grade abrasives, high-alumina cement, ceramics, chemicals, and medicine. When the bauxite contains sulfur, regardless of the level of sulfur content, it has a great influence on the process stability of Bayer process to produce alumina. The sulfide minerals in bauxite are mainly pyrite, isomer marcasite and colloid pyrite, among which pyrite begins to react with lye at 180 degrees, while marcasite and colloid pyrite are more Easily decomposed by lye to generate S 2- , SO 3 2- , SO 4 2- , S 2 2- , S 2 SO 3 2- , not only causing loss of NaOH, but also S 2- , S...