METHOD FOR MAKING SULFATED POLYALUMINUM CHLORIDE (PACS) OR POLYALUMINUM CHLORIDE (PAC) AND PACS OR PAC MADE BY SAME

摘要

Methods for making a sulfated polyaluminum chloride (PACS) flocculating agent solution, which may be aqueous, include neutralizing an aqueous sulfate-containing aluminum compound with an aqueous base to produce an aluminum hydroxide precipitate dispersed in a liquid, settling the aluminum hydroxide precipitate to create a supernatant liquid, removing an amount of the supernatant liquid to leave a remainder that contributes a selected concentration of sulfate to the PACS, and bringing the precipitate back into solution thereby forming the PACS flocculating agent. Also, methods for making a polyaluminum chloride (PAC) flocculating agent solution are disclosed that include neutralizing an aqueous chloride-containing aluminum compound with an aqueous base to produce an aluminum hydroxide precipitate dispersed in a liquid, settling the aluminum hydroxide precipitate to create a supernatant liquid, optionally, removing an amount of the supernatant liquid, and bringing the precipitate back into solution thereby forming the PAC flocculating agent.

主权项

1. A method for making an aqueous sulfated polyaluminum chloride, the method comprising:
mixing a sulfate-containing aluminum compound with a base to produce an aluminum hydroxide precipitate dispersed in a liquid; settling to concentrate the aluminum hydroxide precipitate and create a supernatant liquid; removing an amount of the supernatant liquid to form a slurry, wherein the slurry contributes a selected concentration of sulfate to a final product; and adding at least one of a low- to mid-basicity polyaluminum chloride solution, an aluminum chloride solution, and a hydrochloric acid solution to the aluminum hydroxide precipitate to bring the precipitate back into solution thereby forming the final product, an aqueous sulfated polyaluminum chloride.