Sodium Bisulphite  is a chemical compound created by bubbling sulfur dioxide through a solution of sodium carbonate in water. It appears solid white in color with a crystalline or granular texture. Sodium bisulfite also emits a slight sulphurous odor. It is not soluble in water and decomposes at its melting point i.e. 180C.

Chemical application and strengths:

• • Sodium bisulfite is a reliable leaching agent for cyanide detoxification in gold mining. Sodium bisulfite is used for detoxification of process leach residues along with air before discharging to the leach residue ponds. Sodium bisulfite serves as the ideal choice for leaching agent in gold mining despite the various doubts and confusion regarding suitable cyanide detoxification agents.

• • Sodium bisulfite also finds applications for clearing oxidative corrosion in large piping systems. The use of Sodium bisulfite is evident in various biochemical engineering applications as it helps in maintaining anaerobic conditions in a particular reactor.

• • Water-treatment facilities use sodium bisulfite in both drinking-water and wastewater treatment. Its primary function involves removing residual chlorine from treated water.

    In drinking-water treatment, operators add sodium bisulfite after the superchlorination stage and before they discharge the treated water into the service reservoir. This process reduces excess chlorine and helps maintain appropriate water quality.

    In wastewater treatment, operators add sodium bisulfite after chlorine disinfection and before they discharge the treated effluent into receiving waters. The chemical neutralizes residual chlorine and helps protect aquatic environments from excessive chlorine exposure.

• • Sodium bisulfite has an interesting feature of application in limited amounts, thereby providing limited costs. The lowered reagent doses with sodium bisulfite make it a cost-effective option for treating cyanide in gold mining. Furthermore, the compliance of sodium bisulfite with safety regulations presents new opportunities for wider uses of Sodium bisulfite.

• The capabilities of Sodium bisulfite for removal of chlorine also establishes its uses in the pulp and paper industry as well as the photographic industry. Sodium Bisulphite

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