Shijiazhuang wholesale supply of zinc oxide indirect method of high-purity zinc oxide 99.7

Zinc oxide Zinc oxide is an oxide of zinc. Insoluble in water, soluble in acid and alkali. Zinc oxide is a common chemical additive, widely used in plastics, Portland products, synthetic rubber, lubricants, paints, ointments, adhesives, food, batteries, flame retardants and other products of the production. Zinc oxide bandgap and large exciton binding energy, high transparency, excellent performance often Wen Faguang, in the semiconductor field of liquid crystal displays, thin film transistors, light-emitting diodes and other products are used. In addition, the micro-particles of zinc oxide as a nanomaterial also begun to play a role in the related fields. Zinc oxide and offline manufacturers mainly concentrated in Shandong (Weifang), Hebei (gaoyi), Jiangsu, Zhejiang and other places, zinc oxide production to 99.7 percent of the main content, commonly known as 997 (99.7) Zinc oxide. Chinese name zinc oxide density 5.606g · cm-3 English name Zinc oxide Appearance white solid nickname zinc oxide powder, zinc white, zinc flash point of 1436 ℃ chemical formula ZnO application of white paint, printing and dyeing, paper, matches and pharmaceutical industry security descriptor molecular weight 81.39 S60 S61 CAS Registry Number 1314-13-2 hazard symbol harmful, dangerous for the environment EINECS Accession No. 215-222-5 Hazard Description R50 / 53 R20 melting point of 1975 ℃ Transport Information UN3077 9 / PG 3 is insoluble in water-soluble the refractive index of 2.008 ~ 2.029n20 / D nature amphoteric oxide Physical and chemical properties Physical property Appearance and properties: White powder or hexagonal crystal. Odorless and tasteless, no sand. The heat turns yellow, after cooling again becomes white heated to 1800 ℃ sublimation. Hiding half of titanium dioxide and zinc sulfide. Coloring power is twice the basic lead carbonate. [4] Solubility: soluble in acid, sodium hydroxide, ammonium chloride, insoluble in water and ammonia. [5] The chemical nature of the chemical data: NIST chemical information: Zinc oxide (1314-13-2) EPA Chemical Substance Information: Zinc oxide (ZnO) (1314-13-2) Category: Oxide Zinc oxide is a famous white pigment, zinc white common name. The advantage is that the same black encountered H2S gas, because ZnS is white. When heated, ZnO from white, yellow and gradually turns lemon yellow, yellow when it receded after cooling, use of this feature, it incorporated into the paint or join thermometer, made of color paint or discoloration thermometer. ZnO convergence and because there is a certain degree of disinfection in the pharmaceutical often use to prepare a paste, ZnO is also used as a catalyst. [5] chemical reaction: Reaction with NaOH: NaOH + ZnO = Na2ZnO2 + H2O NaOH + ZnO + H2O = Na2 [Zn (OH) 4] Chemical Quality Inspection: alkalinity: take the goods 1.0g, add new boiling water 10ml, shake for 5 minutes, let cool, filtered, and the filtrate add 2 drops of phenolphthalein indicator solution, such as significant pink, add hydrochloric acid titration solution (0.1mol / l) 0.10ml, pink should disappear. Carbonate and acid insoluble: Take this product 2.0g, 10ml water mixture, add dilute sulfuric acid 30ml, on a water bath heated bubble may not occur; After stirring, the solution should be clarified. Ignition loss: to take the goods of about 1.0g, accurately weighed, ignition at 800 ℃ to constant weight, less weight loss should not exceed 1.0%. Molysite: take the product 0.40g, add dilute hydrochloric acid 8ml, 15ml water and 2 drops of nitric acid, boiled for 5 minutes to dissolve, let cool, add water to make into a 50ml, after mixing, remove 25ml, add water 10ml, and standard iron solution control solution 1.0ml made, not deeper (0.005%). Lead salts: Take this product 2.0g, 20ml water, stir, add glacial acetic acid 5ml, dissolved after heating on a water bath, let cool, filtered, and the filtrate add 5 drops of potassium chromate indicator solution, turbidity shall not occur.