Metal treatment
Chemical manufacturing
Manufacturing organic compounds like resins and ethanol
Regulating the pH level of manufacturing processes
Lowering the pH (or alkalinity) of water
Removing and dissolving rust and scale
Regenerating ion exchange resin systems
Producing inorganic compounds (such as ferric chloride and aluminum chlorohydrate for water treatment)
Assisting in oil production at oil wells
Neutralizing of alkaline products and waste materials
Processing various food products and additives through hydrolysis, purification, and neutralization
Producing animal feed additives and milling corn
Clarifying and neutralizing waste streams
Recovering semi-precious metals from catalysts
Manufacturing dyes & pigments

In steel production in the pickling process, which removes rust from steel coils and sheets
In aluminum etching, metal prefixing for galvanizing and soldering, and for metal cleaning
In oil well stimulation and acidizing, HCI removes rust, scale, and carbonate deposits in oil wells to encourage the flow of crude oil or gas to the well
Manufacturers of consumables and pharmaceuticals use HCl to improve the pH balance of drinking water, food, and pharmaceuticals
Manufacturers of polyvinyl chloride (PVC) use HCl in manufacturing the organic compounds used in producing PVC
To adjust swimming pool pH balance
For corn starch hydrolysis to make corn syrup
Deionized-Water Producers use HCl in the process of removing ionized particles from water
Wastewater Management uses HCI to help wastewater managers produce the inorganic compounds they need to process wastewater
In mining, for ore treatment, extraction, separation, purification and water treatment
By the food industry to regenerate exchange resins, acid-modify cornstarch, and adjust pH of intermediates, final products, and wastewater; for hydrolyzing vegetable protein, consumed in the production of artificial sweeteners
In agriculture, as an animal feed additive
In chlorine dioxide systems
In the carbonizing of wool and de-liming, tanning, and dyeing of hides by the leather industry