Dry treatment method of bauxite tailings

Abstract

The invention relates to a dry treatment method of bauxite tailings. The dry treatment method comprises the steps that ore washing tailings are sent into a first hydrocyclone group to be subjected tohydrocyclone separation, and first rough sand and first overflow are acquired; the first rough sand is screened, and first screen underflow and first screen overflow are acquired; the first screen underflow and the first overflow are sent into a second hydrocyclone group to be subjected to hydrocyclone separation, and second overflow and second rough sand are acquired; the first screen overflow and the second rough sand are sent into a silica removing machine to be subjected to silica removing, and third overflow and third rough sand are acquired; the third rough sand is screened, and second screen underflow and second screen overflow are acquired; the third overflow, the second overflow and the second screen underflow are subjected to thickening treatment, and fourth overflow and underflow are acquired; and a flocculating agent is added into the underflow, the materials are uniformly mixed and are filtered, and filtrate and filter cakes are acquired. According to the dry treatment method, useful minerals are recycled from the ore washing tailings, and the resource comprehensive utilization rate is increased; and finally, the ore washing tailings are subjected to dehydration, the filtrate is used for ore washing and is reused, and the filter cakes are used for backfilling of goafs, so that water resources and land resources are saved.

Description

technical field [0001] The invention belongs to the technical field of mining and relates to a dry processing method for bauxite tailings. Background technique [0002] At present, the washing tailings sludge of karst accumulation type bauxite is basically discharged by wet method, that is, after the washing tailings are settled and concentrated by the thickener, the tailings sludge with a moisture content of nearly 70% is discharged into the tailings storage. This tailings treatment method is generally called the "wet" process (referring to the use of general sedimentation and concentration technology), which is characterized by high moisture content of the final tailings, large stockpiles, and high environmental risks. The generation of a large amount of tailings sludge not only requires sufficient storage capacity of tailings stockpiles; moreover, tailings stockpiles are at risk of leakage and dam failure, which are always a concern for mine and surrounding production, ec...

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Problems solved by technology

[0003] In the existing dry treatment process of bauxite tailings, plate and frame filter press is the only process currently used. Due to its high energy consumption, low treatment efficiency, high production cost, and the need to add lime powder as a filter aid, The filter cake is weakly alkaline, which is not very beneficial to the subsequent biological reclamation of backfilled gobs, so it has not been applied and promoted

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