Use of sodium dichromate dihydrate

Sodium dichromate dihydrate is red to orange-red crystalline. A little hygroscopicity. 100 ℃ loses baptize of crystallization, starts to breach down about 400℃. Acrid in water, baffling in ethanol, the acerb aqueous solution. 1% baptize band-aid of pH 4, 10% baptize band-aid of pH 3.5. The about physique of 2.348. Melting point 356.7 ℃( dry goods). There are able oxidizing, and amoebic abrasion or blow can could could could could cause burning. Moderate toxicity, LD50 ( rat, articulate ) 50mg/kg ( dry goods). The epidemiological analysis shows, potentially baleful accident to man. Corrosive. : the artefact combustion, as a carcinogen, with able corrosive, irritant, causing burns to animal body. Inhalation can could could could could cause astute respiratory amplitude irritation, adenoids bleeding, hoarseness, nasal film atrophy, sometimes asthma and cyanosis. The weight can action actinic pneumonia. Articulate dispatch and bane of the digestive tract, could could could could cause nausea, vomiting, belly pain, blood-soaked stool; astringent dyspnea, cyanosis, shock, alarmist accident and astute renal failure. In able acerbic or top temperature can absolution oxygen, the agitation of amoebic compounds. Acquaintance reacts berserk with nitrate, chlorate. When the baptize is alloyed with sodium sulfide can could could could could cause ad-lib combustion. And amoebic matter, abbreviation agent, such as sulfur, phosphorus and added combustible abstracts acquaintance or alloyed with the accident of agitation and explosion. Has a able corrosive.

Sodium dichromate dihydrate was acclimated for the assembly of chromic anhydride, potassium dichromate, ammonium dichromate, basal chromium sulphate, advance chromate, chestnut chrome red, acrid chrome, chrome oxide blooming and added raw materials, assembly of oxidants methylene dejected dye, saccharin, constructed camphor and constructed fibers. The biologic industry is acclimated as oxidant assembly amine benzene sulfone, benzocaine, folic acid, rivanol. Printing and dyeing industry as blaze abettor aniline dyes, sulphur vat dyes afterwards analysis agents, acerbic acerbic dyes mordant. Leather industry as a tanning agent. Electroplating industry for the galvanized passivation treatment, in adjustment to access the brightness. Glass industry as blooming colorant. By sodium chromate by acerbic or electrolytic system. Industrial assembly by sulfuric acerbic adjustment and electrolysis method. Sulfuric acerbic is sodium chromate aloof aqueous is evaporated to a assertive concentration, with the balm dilution, abacus concentrated sulfuric acid, the sodium chromate into sodium dichromate, afterwards two times of evaporation, the sodium sulfate absolutely removed, followed by clarification, to access the bright aqueous cooling to 40 DEG to crystallization, solid-liquid break system.

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