Oxalic acid
Purifying agent in pharmaceutical industry, special in antibiotic medication, such as oxytetracycline , chloramphenicol , etc;
Precipitating agent in rare-earth mineral processing;
Bleaching agent in the textile activities, wood pulp bleaching;
Rust-remover for metal treatment;
Grinding agent, such as marble polishing;
Waste water treatment, removing calcium from water.
