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1

Abstract

In this thesis, a lot of experiments were carried out to solve the problem of industrial aluminized wastewater treatment and utilization.

At present, a lot of the catalyst used in industry is precious metal catalyst which aluminum oxide is as its carrier. Therefore, waste water discharge contains a lot of aluminum ion. If the alumina contained waste water discharges directly, it can cause certain environmental pollution as well as a serious waste of the aluminum resources. So, the treatments of industrial aluminum-containing waste water are of great significance in improving our environment pollution as well as promoting sustainable industrial development.Basic properties of the plant effluent were tested in this experiment,, including aluminum ion content and PH value before and after the waste water treatment, and chemical precipitation was mainly used, through sedimentation, filtration and other operations to make aluminum hydroxide in the wastewater precipitated out in this way, and then precipitation was processed to high-purity aluminum sulfate, and the PH of wastewater was 6-9 which reached the national emission standards.In this method, attention should be paid to that in the environment different PH value, the material exist in different ways because aluminum is amphoteric metal.By adjusting the PH, using parallel experiment to measure the best PH value, the reaction time and some other conditions when precipitation appeared, thus high purity alumina was obtained. At the same time, the experimental results which obtained from the reactions of different kinds of alkaline reagents and wastewater were analyzed, and its advantages and disadvantages as well as the best way to get precipitation were discussed. This chemical precipitation in the experiment is easy to operate and costs low. Moreover, its products are of high purity.

Key word: aluminum ion, chemical precipitation, PH value, amphoteric

2

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3

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