Method for carrying out dry-method capacity expansion in mountainside wet-process red mud disposal site

Abstract

The invention discloses a method for carrying out dry-method capacity expansion in a mountainside wet-process red mud disposal site. The method comprises the following steps of: (1) carrying out drainage solidification treatment on a wet drainage red mud layer near an original wet-process red mud disposal site preliminary-stage dam (1) with a sand pile (2); extending a released water chute (4) of the original wet-process red mud disposal site to a planning dry-method capacity expansion elevation along a mountain slope, wherein the lower section of the released water chute (4) is connected with a released water pipeline (11); building a flood intercepting trench (5) along a planning dry-method stockpiling boundary; building a red mud filter pressing workshop (6) at a position of the mountain slope, which is hither than the extended released water chute (4), arranging a plurality filter presses (7) adaptive with the quantity of the red mud in the workshop, and paving a red slurry pipeline (8) and a filtrate pipe (9) along the mountain slope; and building a chute (10) along the mountain slope by taking the red mud filter pressing workshop (6) as the starting point, and extending the chute to the top of the original wet-process red mud disposal site. By adopting the invention, the reservoir storage capacity of the original wet-process red mud disposal site is increased, and the investment is saved.

Description

technical field [0001] The invention relates to a dry-process capacity-increasing method for a mountain-side wet-process red mud storage yard, and belongs to the technical field of red mud storage in alumina production. Background technique [0002] Red mud is a waste residue produced in the production of alumina. The main component of red mud is Si0 2 , CaO, Fe 2 0 3 、A1 2 0 3 、Na 2 0.TiO 2 、K 2 O, in addition, it also contains burning ingredients and traces of other non-ferrous metals. In the case that the red mud cannot be used in large quantities but must be stockpiled, there are currently three main stockpiling processes. [0003] The first storage process is the wet storage process. Wet storage is a more traditional red mud storage method. Red mud and attached liquid are oxidized by centrifugal pumps and pipelines at a liquid-solid ratio of (3-4): 1 (solid content is about 20%-25%) The aluminum factory sends the red mud to the red mud stockpile, and the red...

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Problems solved by technology

The second is the one-time dam construction method adopted by Shandong Weiqiao Alumina Plant, Chiping Alumina Plant and other enterprises that use pure Bayer method to produce alumina with imported gibbsite ore. Earth and stone and other materials are used to build a certain height in the initial stage. dam, and then stack the Bayer process red mud. Because the Bayer process red mud is in a flow-plastic state under high water content conditions and has no mechanical strength, it is impossible to build a sub-dam, and only a one-time earth-rock dam can be built. When it is full, it will be discarded and another storage yard will be built

Even if a new site is found far away from the factory area, the investment is often as high as hundreds of millions of yuan, and the operating cost is relatively expensive

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