Sulfuric acid is widely used in various industries concentrated sulfuric acid properties industrial sectors, mainly in the fertilizer industry, metallurgical industry, petroleum industry, machinery industry, pharmaceutical industry, production of detergents, military industry, nuclear industry and the aerospace industry. Also used in the production of dyes, pesticides, chemical fiber, plastics, coatings, and a variety of basic organic and inorganic chemical products. Early sulfuric acid industry have adopted nitration, equipment manufacturing strength low sulfuric acid corrosion product concentration only 60 to 76%. Sulfuric acid daily household use, nitration gradually being replaced by a contact method since the 20th century. Production of sulfuric acid raw materials are sulfur, pyrite, non-ferrous metal smelting smoke, gypsum, hydrogen sulfide, sulfur dioxide and sulfuric acid and other waste. Sulfur, pyrite and smelt smoke are three main ingredients. Preparation of burning sulfur dioxide purification system or heat treatment pyrite, preparation of sulfur dioxide (domestic pyrite, which is why commonly pyrite) S + O2═ ignite ═SO24FeS2 + 11O2═ contact with high temperature oxidation of ═8SO2 + 2Fe2O3 sulfur trioxide 2SO2 + O2═2SO3 (using as catalyst vanadium pentoxide and the reaction is a reversible reaction) with 98.3% sulfuric acid absorption xSO3 + H2SO4═H2SO4 · x SO3 (sulfuric acid binding molecule several molecules of sulfur trioxide, fuming formed sulfuric acid) SO3 + H2SO4═H2S2O7 (coke, sulfuric acid) water H2SO4 · x SO3 + xH2O═ (x + 1) H2SO4H2S2O7 + H2O═2H2SO4 purification process can be subjected to distillation industry concentrated sulfuric acid, can give a concentration of 95% to 98% of the merchandise concentrated sulfuric acid. Phosphoric acid reaction after other methods, the use of phosphogypsum, industrial recycling, using legal sulfate dihydrate. More classic system of law as well as the use of oxalic acid and ferrous sulfate reaction FeSO4 + H2C2O4 = H2SO4 + FeC2O4 ↓ family prepared by combustion of sulfur in oxygen to give sulfur dioxide, hydrogen peroxide and then pass into the prepared sulfuric acid. Or sulfur dioxide into the water slowly oxidized to sulfuric acid. TONGXU sulfate | Zhengzhou Longda chemicals | sulfuric acid are provided by Zhengzhou Longda Chemical Products Limited. Zhengzhou Longda Chemical Products Co., Ltd. (www.longdahuagong.com/) adhere to the "people-oriented" business philosophy, with a professional staff, and strive to provide the best products and services to contribute to society, and to welcome new and old customers to visit us sincere cooperation for a better future. Zhengzhou Longda Chemical - your trusted friend, Address: High-tech District, Zhengzhou City, Henan Province Chemical Road 99 (Chemical Road and Rita Road intersection 100 meters south west), Contact: Manager Xu.