Method for building fill dams in red mud disposal site through slurry dry method and structure of fill dam

Abstract

The invention discloses a method for building fill dams in a red mud disposal site through a slurry dry method and a structure of the fill dam. A red mud filter cake filter pressing workshop (1) is arranged outside a dam body of a slurry red mud disposal site primary dam (3) ; before the fill dams (2) are built in the red mud disposal site, a foundation (4) is built on the inner side of the dam body of the primary dam (3) through block stone dumping filling or filter cake dry red mud backfilling at first; the fill dams (2), a dam slope stable safety zone 6 and a dry red mud filter cake stockpiling zone 7 are built through filter cake dry red mud produced by the red mud filter cake filter pressing workshop (1), the red mud surfaces are all inclined to a floor regulation pool (5) in the disposal site, and the gradient i is no less than 1%; and a slurry red mud discharging mode is adopted by other zones of the slurry red mud disposal site except the fill dams (2), the dam slope stable safety zone 6 and the dry red mud filter cake stockpiling zone 7, and the stockpiling elevation of a slurry red mud discharging zone (8) should be always lower than the height of the filter cake dry red mud stockpiling zone 7 and meet the red mud disposal site flood regulation requirements required by related national standards. The problems that fill dams are difficult to build in red mud disposal sites through a slurry dry method, the dam building time is long, water is liable to be accumulated in a dry beach range, and consequently the related national standards and requirements are not met can be effectively solved.

Description

technical field [0001] The invention belongs to the technical field of red mud stockpiling in alumina production, and in particular relates to a method for building a stockpile dam in a slurry dry process red mud stockyard and its structure. Background technique [0002] Red mud is the solid residue after alumina is extracted from bauxite with alkali. When red mud cannot be used in large quantities, a red mud storage yard must be built to store the red mud. At present, the stockpiling process generally adopted in newly-built red mud storage yards in China is slurry dry stockpiling or filter cake stockpiling process. [0003] The process flow of slurry dry red mud storage is as follows: after repeated washing, the solid content of the red mud slurry separated by the settling tank is about 30% to 40%, and then further dehydration is carried out to increase the solid content to about 55%. The diaphragm pump is used to send the red mud to the red mud storage yard through pipeli...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method and its structure for constructing an accumulation dam in a slurry dry red mud storage yard, so as to solve the difficulty in building an accumulation dam in a slurry dry red mud storage yard, long dam building time, and the content of the dry beach It is easy to accumulate water and does not meet the requirements of relevant national regulations.

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