Method and system for preparing bayerite from secondary scrap aluminum ash

Abstract

The invention discloses a method and system for preparing bayerite from secondary scrap aluminum ash. The method comprises the following steps: detecting an alumina content, determining a treatment reagent formula, performing reagent treatment, molding, performing constant temperature treatment, calcining and cooling. According to the method disclosed by the invention, the bayerite is prepared byutilizing the industrial waste secondary scrap aluminum ash, and the wastes are changed into valuable materials. Moreover, no wastewater, waste acid, dust or waste is produced in the whole preparationprocess, and a small amount of produced waste gases can be effectively removed, so that energy-saving, environmentally-friendly and zero-emission requirements are met, and the method and the system benefit the nation and the people, are favorable for enterprise development and have significances for protecting ecological environment security and promoting social and economic development.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a preparation method for preparing bauxite from secondary waste aluminum ash, a preparation system, regenerated bauxite and its application, and belongs to the recovery and regeneration technology of secondary waste aluminum ash. Background technique [0002] Primary aluminum ash is a kind of ash produced in the process of producing primary aluminum or aluminum products, which contains high-value metal aluminum and alumina. Due to its high economic value, primary aluminum ash has been valued as a resource. Correspondingly, there are more technical means of recycling and regeneration, and the secondary waste aluminum ash is the residue after the primary aluminum ash is extracted. At present, there is no effective secondary waste aluminum ash recovery and regeneration technology, but the global secondary waste aluminum ash The production amount of aluminum waste is increa...

AI Technical Summary

Problems solved by technology

[0004] (1) Hazards of landfill treatment: Most of the secondary waste aluminum ash treatment in the prior art uses landfill methods, because the pollutants contained in the secondary waste aluminum ash will seriously pollute the soil, causing abnormal or even mutated plant growth;

[0005] (2) Hazards of stacking treatment: some aluminum processing factories directly stack the secondary waste aluminum ash on the roadside, let it blow and rain, if it floats in the air and is absorbed by the human body, it will lead to memory loss, and in severe cases, it will lead to dementia Complications;

[0006] (3) Hazards of injecting into rivers: Some aluminum processing enterprises directly pour secondary waste aluminum ash into rivers, which is even more harmful, seriously pollutes water quality, causes fish populations to die or aquatic products are poisoned, and brings immeasurable losses to people's lives and property Loss

[0011] The recovery and regeneration technology of the above-mentioned secondary waste aluminum ash not only causes a serious waste of resources, but also produces a large amount of pollutants, pollutes the natural environment, and endangers the health of the public. It is extremely inconsistent with the current concept of green ecology and sustainable development. commensurate

In addition, its processing cycle is also very long, and it requires expensive special equipment and matching professionals. At the same time, it can only be recycled and recycled in small batches, so it has no market promotion value.

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