Drainage water diffluence method for dry red mud disposal and drainage water diffluence structure thereof

Abstract

The invention discloses a drain-separation method of dry process red mud yard and a drain-separation structure thereof; wherein, the structure comprises a red mud yard, a filter pipe, a yard water recycling tank and a returning pipe. In the method, the yard water recycling tank is arranged as the two of an independent red mud adhesive liquid water recycling tank and a rain water recycling tank, adrain corridor for draining rain water and examining and repairing the returning pipe is arranged at the bottom of the red mud yard, the drain corridor is communicated with the rain water recycling tank, the returning pipe is formed by collocating and connecting steel pipes and metal soft pipes, and a ring-shaped groove which is used for diffluentence is arranged at the bottom end in the filter pipe, and the returning pipe is connected with the ring-shaped groove part of the filter pipe. In this way, not only the reliability of water returning system is ensured, but also pollution to environment aroused by leakage of adhesive liquid is prevented, meanwhile, the arrangement to the drain corridor can also bring convenience for examining and repairing the water returning system, stability ofproduction system is improved, and the hidden trouble of water leakage is eliminated.

Description

technical field [0001] The invention relates to a drainage diversion utilization method and a drainage diversion device of a dry-process red mud storage yard, belonging to the technical field of red mud dry disposal. Background technique [0002] Red mud is a waste residue produced in the production of alumina. Except for a small amount of red mud that can be comprehensively utilized, each alumina plant needs to build a special red mud storage yard to store red mud. There are two main methods of red mud storage: dry method and wet method. It is generally believed that the red mud entering the storage yard has a moisture content of more than 47% as a wet method, and a moisture content lower than 47% as a dry method. Red mud with alkali is generally 3~5g / L. Therefore, the pH value of the red mud attached liquid is usually above 12. The storage condition of the wet storage yard is similar to that of a reservoir, and has the disadvantages of high soaking line, high safety an...

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Problems solved by technology

[0006] (1) The backwater system does not consider the separation of rainwater and red mud attached liquid, which is not conducive to the use of backwater with different alkalinity to the sections of the alumina plant that have different requirements for alkalinity

Moreover, the heavy rain has the characteristics of short time and large flow. After mixing with the attached liquid in the backwater tank, the pH value is relatively high, which brings difficulties to the water balance of the alumina plant.

[0007] (2) The backwater pipeline at the bottom of the reservoir is long and requires high reliability

After the storage yard is in operation, once the return pipe at the bottom of the reservoir breaks due to uneven subsidence of the foundation and other reasons, the red mud attached liquid will leak and cause alkali pollution to the environment; since the red mud slurry continues to enter the storage yard, the underground pipeline is a hidden project, and it is not easy to leak Even if the leak point can be identified, it is difficult to repair due to the huge amount of excavation. Therefore, the damage to the return pipe at the bottom of the reservoir will affect the continuous operation of the dry process yard, and even affect the continuous operation of the alumina plant, because the construction of a red mud yard will not only The investment is huge, and it takes 1 to 2 years of construction time

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