Method for increasing capacity of flat type wet-method red mud disposal site by dry method

Abstract

The invention discloses a method for increasing the capacity of a flat type wet-method red mud disposal site by a dry method, which comprises the following steps of: building an intercepting ditch (1) at the periphery of a new border; paving a rubble layer (2) on the outer sloping surface of the conventional wet-method red mud disposal site, and burying a perforated collector pipe (3) on the bottom of the wet-method red mud disposal site; connecting the perforated collector pipe (3) with a seepage pipe (4), and putting the seepage pipe (4) into the intercepting ditch (1); covering geotextile on the surface of the rubble layer (2); building a red mud storage tank (5) outside the intercepting ditch (1), connecting the red mud storage tank (5) with a feed pump (6), arranging a press filter (7) on the top of a fill dam of the conventional wet-method red mud disposal site, and arranging a water pump (10) at the lowest point of the intercepting ditch (1); heightening a flood discharge shaft (12) to the planned elevation; and performing press filtration on the red mud by using the press filter (7), conveying the red mud to a piling area for dry-method stockpiling, discharging flood by using the flood discharge shaft (12), collecting the rainwater, filtrate generated by the press filter (7) and seepage water on the outer slop of the conventional dam by using the intercepting ditch (1), and conveying back to a plant area by using a back water pump (10).

Description

technical field [0001] The invention relates to a dry-process capacity-increasing method for flat-type wet-process red mud storage yards, 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. The 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% to 25%). The aluminum factory sends the red mud to the red mud stockpile, and the r...

AI Technical Summary

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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