Method for dewatering washing tailing slime of bauxite ore

Abstract

The invention relates to a method for dewatering washing tailing slime of bauxite ore. The method includes the steps that firstly, tailing slime of the bauxite ore is fed into a storage tank through afluid director, flocculant is added, preliminary flocculation is carried out, and slurry is obtained; and then the slurry is fed into a pipe mixer, modified flocculant is added, further flocculationis carried out, thorough stirring is carried out, three-stage dewatering is carried out by adopting a belted filter, and a filter cake and filtrate with the moisture content not higher than 35wt% areobtained. According to the method for dewatering the washing tailing slime of the bauxite ore, the modified flocculant is utilized ingeniously, thus compact fine tailing slime particles are convertedinto loose flocculation, and filtration and dewatering of the tailing slime are facilitated; the moisture content of the generated filter cake is no more than 35wt%, the filter cake has no fluidity, and can be used for backfilling goaf, tailing wet storage of the tailing slime is changed into dry disposal, safety and the environmental protection effect are obvious, energy consumption of filtrationand dewatering is low, and water resources are saved.

Description

technical field [0001] The invention relates to a method for dehydrating bauxite washing tailings and slime, which belongs to the technical field of mining. Background technique [0002] Pingguo bauxite is a karst accumulation type bauxite. During its development and application, an ore washing process is set up to remove up to 60% of the ore slime to obtain clean aluminum ore. The sludge removed from the ore washing process generally forms about 13wt% (weight percent concentration) mud water (mine tailings), which is fed into the thickener and supplemented with flocculants. After settling and concentrating, the thickener overflows and returns to the washing machine. For ore recycling, the underflow (about 30wt%) of the thickener is generally pumped to the tailings storage for storage. This tailings treatment method is generally referred to as the "wet" process (referring to the use of general sedimentation and concentration technologies), which is characterized by high moi...

AI Technical Summary

Problems solved by technology

[0003] During the experimental research on the further dehydration of ore tailings and dry tailings storage, Pingguo Aluminum Mine has explored using different equipment such as plate and frame filter presses and vacuum suction filters, and found that using plate and frame presses The dehydration methods of filter and vacuum suction filter all have the disadvantages of low processing efficiency and high operating cost, so it is difficult to popularize and apply

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