Polymeric aluminum chloride flocculant preparation method using phthalocyanine green waste water

Abstract

A process for preparing polymerized aluminium chloride flocculating agent from phthalocyanine green waste water comprising, placing the type 335 weak alkaline anion exchange resin into adsorbing column, flowing dilute hydrochloric acid through the adsorbing column, rinsing the resin column with water or deionized water, processing the resin column by weak alkaline liquor, finally rinsing the adsorbing column with water or deionized water until water exhibits weak alkalinity, adjusting the pH of phthalocyanine green waste water, making it pass through the pretreated and transformed type 335 weak alkaline anion exchange resin column from normal temperature to 50 deg. C, and passing through another ion exchange resin adsorbing column, thus obtaining the phthalocyanine green waste water whose copper ion concentration meets second level standard. By concentrating the phthalocyanine green waste water treated by the resin under the condition of stirring and heating, adding in alkalinizing agents simultaneously for reaction, adjusting waste water till it exhibits weak acidity, continuously stirring and conducting heating reaction, the liquid product or solid end product can be obtained.

Description

technical field [0001] The invention relates to a method for preparing a polyaluminum chloride flocculant, in particular to a method for preparing a polyaluminum chloride flocculant with phthalocyanine green wastewater. Background technique [0002] Phthalocyanine green is a pigment widely used in industry. During its production process, a large amount of strongly acidic wastewater containing high concentrations of copper, aluminum, and chlorine is produced. The current industrial treatment process is to neutralize the wastewater with alkaline substances such as lime to remove The copper and aluminum ions in it are then diluted with water to eliminate the influence of chloride ions on the subsequent biochemical treatment. In this process, a large amount of metal hydroxide-containing waste slag will inevitably be produced, and the metal substances in it will pose a potential threat to the ecological environment of the stacking site, and have not yet been utilized as resources...

AI Technical Summary

Problems solved by technology

Compared with the present invention, these several preparation methods have disadvantages such as high cost, complex process, narrow pH range of wastewater treatment (only wastewater with pH in 4-10 can be processed)

[0003] However, phthalocyanine green wastewater contains a large amount of ingredients that can be used to prepare polyaluminum chloride flocculants. By taking certain methods to remove copper ions, the aluminum ions and chloride ions can be used to prepare polyaluminum chloride flocculants. However, since there is no good method for removing copper ions in phthalocyanine green wastewater, the current treatment of phthalocyanine green wastewater only uses conventional methods to treat and then discharge directly, which is a serious waste of resources. Although direct discharge can Meet the requirements of national standards, but still have adverse effects on the environment