A method of processing a non-virgin sulfuric acid solution for the preparation of aluminum sulfate comprises the steps of combining a sulfuric acid solution having less than about 90% sulfuric acid with a water solution to form a mixed solution of no less than about 10% sulfuric acid. An alumina-containing compound such as aluminum hydroxide or aluminum bauxite is then added to the mixed solution to form aluminum sulfate.

A method of processing a non-virgin sulfuric acid solution for the preparation of aluminum sulfate comprises the steps of combining a sulfuric acid solution having less than 90% sulfuric acid with water to form a mixed solution of no less than about 10% sulfuric acid. An alumina-containing compound such as aluminum hydroxide or aluminum bauxite is then added, the combination forming a pH of 2.0 or less. Once a specific gravity of less than about 1.36 is reached, the aluminum sulfate cools and settles overnight before filtering and/or storing.

A system and method for processing a sulfuric acid waste output for the preparation of aluminum sulfate comprises providing a sulfuric acid waste output at a manufacturing facility and feeding the output into an onsite system of preparing aluminum sulfate at the manufacturing facility. The sulfuric acid waste output may be fed into an onsite system for preparing aluminum sulfate either directly after its production as a byproduct output or after onsite storage of the output. By combining a water solution with the sulfuric acid waste output prior to adding an alumina-containing compound to the combined solution to form aluminum sulfate, the sulfuric acid waste output is safely converted into a useful output without the need for transport offsite.

The invention relates to a method for producing coagulant aluminium salts. Raw material comprising at least one aluminium oxide compound is mixed with a process acid or a base to form a reaction mixture, which is heated to a reaction temperature of at least 100 C. at a reaction pressure. The aluminium oxide compound is allowed to react with the process acid or the base. The aluminium oxide compound is selected from a group consisting of amorphous aluminium oxide, -aluminium oxide, -aluminium oxide, -aluminium oxide, or any of their mixtures. The reaction pressure is at least 2 bar(g).

The invention relates to a method for producing coagulant aluminium salts. Raw material comprising at least one aluminium oxide compound is mixed with a process acid or a base to form a reaction mixture, which is heated to a reaction temperature of at least 100 C. at a reaction pressure. The aluminium oxide compound is allowed to react with the process acid or the base. The aluminium oxide compound is selected from a group consisting of amorphous aluminium oxide, -aluminium oxide, -aluminium oxide, -aluminium oxide, or any of their mixtures. The reaction pressure is at least 2 bar(g).

A method of processing a non-virgin sulfuric acid solution for the preparation of aluminum sulfate comprises the steps of combining a sulfuric acid solution having less than about 90% sulfuric acid with a water solution to form a mixed solution of no less than about 10% sulfuric acid. An alumina-containing compound such as aluminum hydroxide or aluminum bauxite is then added to the mixed solution to form aluminum sulfate.

A system and method for processing a sulfuric acid waste output for the preparation of aluminum sulfate comprises providing a sulfuric acid waste output at a manufacturing facility and feeding the output into an onsite system of preparing aluminum sulfate at the manufacturing facility. The sulfuric acid waste output may be fed into an onsite system for preparing aluminum sulfate either directly after its production as a byproduct output or after onsite storage of the output. By combining a water solution with the sulfuric acid waste output prior to adding an alumina-containing compound to the combined solution to form aluminum sulfate, the sulfuric acid waste output is safely converted into a useful output without the need for transport offsite.

A method of processing a non-virgin sulfuric acid solution for the preparation of aluminum sulfate comprises the steps of combining a sulfuric acid solution having less than 90% sulfuric acid with water to form a mixed solution of no less than about 10% sulfuric acid. An alumina-containing compound such as aluminum hydroxide or aluminum bauxite is then added, the combination forming a pH of 2.0 or less. Once a specific gravity of less than about 1.36 is reached, the aluminum sulfate cools and settles overnight before filtering and/or storing.

A method of processing a non-virgin sulfuric acid solution for the preparation of aluminum sulfate comprises the steps of combining a sulfuric acid solution having less than 90% sulfuric acid with water to form a mixed solution of no less than about 10% sulfuric acid. An alumina-containing compound such as aluminum hydroxide or aluminum bauxite is then added, the combination forming a pH of 2.0 or less. Once a specific gravity of less than about 1.36 is reached, the aluminum sulfate cools and settles overnight before filtering and/or storing.