Polymeric aluminum chloride flocculant preparation method using phthalocyanine green waste water

Abstract

A method for preparing polyaluminium chloride flocculant with phthalocyanine green wastewater, which is characterized in that: select 335 type weakly basic anion exchange resin and put it into the adsorption column, then use dilute hydrochloric acid to flow through the adsorption column, and then use water or deionized Wash the resin column with water, then treat the resin column with dilute lye, and finally wash the adsorption column with water or deionized water until the effluent is weakly alkaline; adjust the pH value of the phthalocyanine green wastewater to make it between normal temperature and 50°C The 335-type weakly basic anion exchange resin column transformed through the above pretreatment, and then another ion exchange resin adsorption column, can obtain the copper ion concentration meeting the secondary standard in the "Comprehensive Wastewater Discharge Standard GB8978-1996" Phthalocyanine green wastewater: Concentrate the phthalocyanine green wastewater treated with the above resin, add an alkalizing agent to react under the condition of stirring and heating at the same time, adjust the wastewater to be weakly acidic, continue to stir and carry out heating reaction, and obtain the present invention 335 type weakly basic anion exchange resin can also be desorbed and regenerated, which not only recovers resources, but also reuses the resin, saving treatment costs. Realized that the purpose of waste utilization is beneficial to environmental protection.

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 using phthalocyanine green wastewater. Background technique [0002] Phthalocyanine green is a very widely used pigment in industry. A large amount of strongly acidic wastewater containing high concentrations of copper, aluminum and chlorine is produced during the production process. The current industrial treatment process is to neutralize the wastewater with alkaline substances such as lime to remove The copper and aluminum ions are then diluted with water to eliminate the influence of chloride ions on subsequent biochemical treatment. In this process, a large amount of metal hydroxide-containing waste slag is bound to be produced, and the metal substances in it will pose a potential threat to the ecological environment of its stacking place, and it has not been used as a resource. Polyaluminum chlo...

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