High-sulfur bauxite flotation and desulphurization method

Abstract

The invention relates to a high-sulfur bauxite flotation and desulphurization method. The high-sulfur bauxite flotation and desulphurization method comprises the following steps of adding lime in the raw ore grinding process, controlling potential of hydrogen (pH) of ore pulp to be in a range of 6-8 and sequentially adding an activating agent, a collecting agent and a foaming agent in the ore pulp to perform flotation. By adopting the high-sulfur bauxite flotation and desulphurization method, the sulfur content of aluminum copper concentrate can be reduced to be below 0.3%under the condition of low collecting agent using amount. Compared with existing high-sulfur bauxite flotation and desulphurization technologies, the high-sulfur bauxite flotation and desulphurization method is low in agent using amount and good in desulphurization effect, corrosion of an acid environment formed by the ore pulp to devices is eliminated, and the high-sulfur bauxite flotation and desulphurization process is efficient and stable.

Description

technical field [0001] The invention relates to a flotation desulfurization method for bauxite, in particular to a flotation desulfurization method for high-sulfur bauxite. Background technique [0002] Pre-flotation desulfurization of bauxite before alumina production is a way of desulfurization of bauxite. The flotation method is used to desulfurize high-sulfur bauxite. In terms of the pH value environment of the flotation pulp, it is mainly The natural acidic pH value environment of high sulfur bauxite formation and Na 2 CO 3 Adjust to an alkaline pH environment for both. [0003] The sulfide minerals in high-sulfur bauxite are often easily oxidized. After grinding, the pulp can form a strong acidic environment with a pH value of about 4.0. The pH environment of the pulp is conducive to the flotation of pyrite, so the chemical consumption is often low , the index is better, and the existing high-sulfur bauxite flotation desulfurization is generally carried out in this ...

AI Technical Summary

Problems solved by technology

However, due to the strong acidity of the pulp at this pH, and the lower pH of the pulp after the acidic water is recycled, it will cause serious corrosion to the flotation equipment and the pulp pipeline; Na 2 CO 3 Adjust the pH to 9-10 for flotation in a medium-alkaline slurry environment, but the floatability of pyrite in an alkaline environment is poor, and it is often necessary to add a high amount (sometimes as high as 3000g / t raw ore) of sulfide ore collectors to collect to better desulfurization effect

It can be seen that the currently used bauxite flotation desulfurization technology is difficult to avoid severe corrosion of equipment by the pulp at the same time of low consumption and high efficiency