3 results about "Aluminum hydroxychloride" patented technology

This invention relates to a method for preparing a perlite-based adsorbent material, the resulting material, and its applications. The preparation method includes: pretreating expanded perlite particles; mixing polyaluminum chloride and urea in water to obtain an impregnation solution; subjecting the pretreated perlite to vacuum impregnation followed by atmospheric pressure soaking, allowing the impregnation solution to enter the open pores; then subjecting it to staged heating treatment to decompose the urea and release alkaline components, promoting the confined transformation and immobilization of aluminum species in the open pores and pore openings of the perlite; subsequently washing, aging, and drying to obtain the perlite-based adsorbent material. The obtained material is a granular material with a particle size of 2–6 mm, containing an aluminum-based immobilization layer on its surface and within its open pores, and can be used for the treatment of phosphorus-containing water.

The application provides a high-alkalinity wastewater pH self-adaptive type polyaluminum chloride modification preparation process and belongs to the technical field of water treatment agents. Through a step-by-step in-situ polymerization process, a basic polyaluminum chloride solution is prepared from hydrochloric acid, aluminum hydroxide and calcium aluminate, then an organic modifier containing a carboxyl-phosphonic acid group, a composite pH buffer component and modified nano magnesium-aluminum hydrotalcite are introduced in sequence, and a pH self-adaptive type modified polyaluminum chloride is obtained through polymerization control. The modified polyaluminum chloride prepared by the application has a salt basicity of 75-90%, and the pH application range is widened to 4-12. The modified polyaluminum chloride can still stably play a coagulation role in high-alkalinity wastewater with pH=10-12 without additional adjustment of the wastewater pH. The removal rate of heavy metal ions such as lead, cadmium and hexavalent chromium is increased by more than 40%, and the alum flower sedimentation speed is increased by more than 35%. The treatment cost and secondary pollution of high-alkalinity wastewater are significantly reduced, and the application is suitable for the treatment of high-alkalinity industrial wastewater such as printing and dyeing, electroplating and chemical industry.