BASIC POLYAUMINUM IRON HALIDE

摘要

Aqueous basic polyaluminum-iron halide solutions, useful as coagulants in waste water treatment are disclosed. The polyaluminum-iron halide solution is prepared by reacting an aqueous polyaluminum halide solution with one or more members of the group consisting of ferrous halide and ferric halide resulting in a solution containing a concentration of metal ions ranging from about 1.35 to 4.5 mol/liter as a dissolved salt of the formula Al1-xFe@@@FeII_y(OH)3+2-zHalz wherein Hal is chlorine, bromine, iodine or mixtures thereof: $is\; about\; 0.2\; to\; 1.5;\; the\; molar\; ratio\; of\; iron\; (II)\; and\; iron\; (III)\; to\; aluminum\; is\; in\; the\; range\; of\; about\; 0.2\; to\; 1.5;$ is\; about\; 0.24\; to\; 0.67;\; the\; mole\; percent\; of\; hydroxide\; (OH)\; to\; the\; sum\; of\; hydroxide\; and\; halogen\; (Hal)\; is\; in\; the\; range\; of\; 24\%\; to\; 67\%;\; and\; z\; is\; less\; than\; 3\; +\; 2y.\; Alternatively,\; the\; coagulant\; solution\; is\; prepared\; by\; reacting\; an\; aqueous\; aluminum\; halide\; solution\; or\; low\; basic\; polyaluminum\; halide\; solution\; with\; iron.\; Preferably\; the\; halide\; employed\; is\; chloride.$$