use | used to produce alumina, sulfuric acid, potash fertilizer, etc. alunite is used to extract alum, and alunite can also be comprehensively utilized to produce potassium sulfate, sulfuric acid, alumina and other products. Alum is mainly used in printing, papermaking, leather making, paint, textile, fiberboard, medicine, food and other departments. It can also be used as mordant for dyeing cloth, hardener for tanning and film, catalyst for synthetic ammonia, clarifying agent for sugar making and water, precipitant for beneficiation, etc. Potassium sulfate is a chlorine-free potassium fertilizer, suitable for the application of cash crops such as tobacco, fruit trees, rubber, and sugar. In addition to aluminum smelting, alumina is also a high-quality raw material for aluminum-based fine chemicals, and can produce toothpaste friction agents, plastic flame retardants, adsorbents for air separation plants, high-efficiency defluorination water purification agents, desiccants, catalysts, etc. Alunite can also produce potassium-nitrogen mixed fertilizer and aluminum-oxygen by ammonia-alkali method. In recent years, alunite has been used as an admixture to produce expanded cement. Alunite is also associated with gallium, uranium and other elements that can be recovered during processing. |