Novel process for treating bauxite washing and screening tailing mud through dry process and comprehensively utilizing bauxite washing and screening tailing mud

Abstract

The invention relates to a novel process for treating bauxite washing and screening tailing mud through a dry process and comprehensively utilizing the bauxite washing and screening tailing mud. The novel process is characterized in that coal ash or lime is added to perform modified pressure filtration dehydration after the bauxite washing and screening tailing mud is concentrated, so that a dry filter cake is formed to feed to a mine mined-out region to fill and perform land reclamation. Mass fraction of the added lime is smaller than or equal to 3%, and mass fraction of the added coal ash is smaller than and equal to 10%. The advanced process technology is adopted, so that a tailing mud base adopting a wet-process discharge mode can be cancelled, project investment and production operation cost are greatly saved, and safety and environment-friendly risk of production operation are reduced to be zero; meanwhile, beneficial conditions are provided for filling and land reclamation of the mine mined-out region in a karst landform region, treatment cost of waste slag coal ash is further saved, and environmental pollution is avoided; and compared with 1-millon concentrate coal washery, the novel process has the advantages that annular economic benefits are 20 millions of Yuan or more; and the novel process has extremely high economic benefits and an extremely high social value.

Description

Technical field [0001] The invention relates to a new process for dry disposal and comprehensive utilization of bauxite washing tailings, and belongs to the technical field of bauxite. Background technique [0002] In the alumina production process, the geological forms of bauxite are mainly divided into two forms, one is called sedimentary bauxite, and the other is called accumulation bauxite. Accumulated bauxite contains a large amount of clay. Under normal circumstances, the amount of clay is 1-2 times that of bauxite. If it is not washed, bauxite cannot be used. It is used in Guangxi, Yunnan and Southeast Asian countries. Basically, bauxite is classified as accumulation type bauxite. [0003] Several large alumina production enterprises in Guangxi and Yunnan in my country all use the washing process, and the tail sludge is discharged by the wet method. The use of wet discharge requires a large investment in the construction of a tail sludge reservoir, and its operating cost is...

AI Technical Summary

Problems solved by technology

[0003] Several large alumina production enterprises in Guangxi and Yunnan of my country all adopt the washing process, and the tailings are all discharged by wet method, which requires a lot of investment in the construction of tailings storage, and its operating cost is also very high

Because the geological form of this area belongs to karst karst landform, there are a large number of karst caves and underground rivers underground, which can easily cause leaks, farmland damage, river pollution and other major safety and environmental accidents

Among the several major alumina production enterprises in Guangxi, many of them have experienced different degrees of leakage, which has brought huge pressure on safety and environmental protection to the enterprises, and also caused huge economic losses to the enterprises.

As my country's environmental protection requirements are getting higher and higher, the safety and environmental protection pressure brought about by wet discharge is increasing. If the change of the discharge method is not considered, once a large leakage accident occurs, the enterprise will not be able to bear the responsibility for safety and environmental protection. huge economic loss