Process for cooling slag and inhibiting pollutant formation

A method for reducing the emission of hydrogen sulfide during the quenching of hot blast furnace slag comprising contacting the slag with a quench-anti-emission medium, where said medium is selected from an aqueous solution of chlorine gas and from an aqueous solution of sodium hypochlorite.

In a process for cooling sulfur-bearing blast furnace slag molten at an elevated temperature and simultaneously inhibiting the formation of hydrogen suslfide, the steps of pouring slag while molten into a cooling pit, mixing a water soluble oxidant with cooling water, said oxidant being a substantially more readily reactive oxidizing agent than the oxygen inherently entrained in said cooling water, the concentration of oxidant being sufficient to inhibit to a major degree the release of hydrogen sulfide from the slag, and pouring said solution of oxidant and water onto the hot slag.

In a process for cooling sulfur-bearing slag which is molten at an elevated temperature and simultaneously inhibiting the formation of hydrogen sulfide, the steps of mixing a readily reactive water soluble oxidant with water, the concentration of oxidant being sufficient to inhibit the release of hydrogen sulfide from the slag, pouring said water on the ground so as to dampen it slightly, and pouring a layer of molten slag onto the slightly damp ground, whereby the steam will penetrate the slag layer with the oxidant inhibiting the release of hydrogen sulfide therefrom.

In a process for cooling sulfur-bearing blast furnace slag molten at an elevated temperature by pouring the molten slag into a reservoir containing cooling water and simultaneously inhibiting the formation of hydrogen sulfide, the steps of first mixing a water soluble oxidant into the cooling water, said oxidant being a substantially more readily reactive oxidizing agent than the oxygen inherently entrained in said cooling water, the concentration of oxidant being sufficient to inhibit to a major degee the release of hydrogen sulfide from the slag, and then pouring the molten slag therein whereby the slag is cooled and broken up by the water while the oxidant inhibits the release of hydrogen sulfide.

A process for reducing the emission of hydrogen sulfide during the quenching of hot blast furnace slag comprising contacting the slag with a quench-anti-emission medium, where said medium is selected from the following:

• an aqueous solution of chlorine, an aqueous solution of an oxidizing metal hypochlorite, an aqueous solution of an oxidizing metal permanganate, an aqueous solution of a peroxide type oxidizing material, and an aqueous solution of fluorine.