Method for utilizing bauxite dust

Abstract

The invention relates to a method for utilizing bauxite dust produced during the aluminum oxide producing process by an ore dressing Bayer method, comprising the following steps of mixing the bauxite dust with the overflow water of a concentrate thickener to obtain the slurry with a certain concentration; after the slurry is mixed with the overflow of a second-grade grader in grinding process according to a certain rate, adding regulator, dispersant and collecting agent to the obtained slurry according to the requirements; and then obtaining the concentrate and tailings after the operations of coarsely scavenging for one time, finely scavenging for two times and scavenging (coarsely scavenging and finely scavenging). The method of the invention prevents the raw ore dust from secondarily flying, overcomes the argillization phenomenon of dramatically grinding the raw ore dust, optimizes the flotation work environment of the bauxite, and improves the selection index.

Description

technical field

[0001] The invention relates to a method for utilizing bauxite dust, in particular to a method for utilizing bauxite dust in the production process of ore dressing Bayer process alumina. Background technique

[0002] During the alumina production process of the beneficiation Bayer process, a certain amount of raw ore dust is generated when the bauxite raw ore is crushed and transported, and the raw ore dust accounts for about 1%-2% of the raw ore amount. At present, these raw ore dusts are collected by bag dust collectors, and then manually cleaned and placed in the raw ore storage yard, and enter the subsequent production process with the raw ore.

[0003] There are some deficiencies in the current treatment method: one is that the dust enters the follow-up production process together with the raw ore, which will cause secondary flying, forming a vicious circle; the other is that due to the fine particle size of the raw ore dust, its （50） It is 13.97μm, and...