Lead tetroxide

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Place of Origin: China Zhejiang Brand Name: CHENGDEDA Model Number: xdd23 Price Terms: FOB Shanghai USD 4500~9000 Terms of Payment: L/C,T/T Supply Ability: 4000 Metric Ton per Year Minimum Order: 2 Metric Ton Packaging: plastic bag in bundles or wooden cases Delivery Lead Time: 35-40days/20MT Goods description: GB Seamless stainless steel pipes 1) Grade: 304, 304L, 304H, 310S, 316, 316L,316Ti, 321, 321H, 347, 347H, 2) Standards: ASTM A213M-94b,ASTM A249M-94a,ASTM A269-94a,ASTM A312M-94b,DIN 17456-85,DIN 17458-85,DIN 17459-92,JIS G3446-1994,JIS G3448-1997,JIS G3459-1997,JIS G3463-1994 3) Size for stainless steel pipes: a) O.D.: 1' to 10' b) W.T.: 2mm to 30mm 4) Length: 4m to 13m 5) Applications: fluid and gas transport, structure, boiler pipes 6)Packing: plastic bag in (Redirected from Red lead)Lead tetroxideIUPAC namedilead(II) lead(IV) oxideIdentifiersCAS number1314-41-6PropertiesMolecular formulaPb3O42PbO.PbO2Molar mass685.598 g/molAppearanceorange red powderDensity8.3 g/cm3Melting point500Except where noted otherwise, data are given formaterials in their standard state(at 25, 100kPa)Infobox referencesUnit cell of Pb3O4Part of red lead's crystal structureRed lead, also called minium, lead tetroxide or triplumbic tetroxide, is a bright red or orange crystalline or amorphous pigment. Its Latin name minium originates from the Minius River in northwest Spain where it was first mined. Natural minium is uncommon, forming only in extreme oxidizing conditions of lead ore bodies. The best specimens known come from Broken Hill, New South Wales, Australia, where they formed as the result of a mine fire [1]. A map and list of known occurrences is available here.The melting point of lead tetroxide is 500 , at which it decomposes to lead(II) oxide and oxygen.Chemically red lead is lead tetroxide, Pb3O4, or 2PbO.PbO2. It is used in the manufacture of batteries, lead glass and rust-proof primer paints.Red lead is virtually insoluble in water. However, it is soluble in hydrochloric acid present in the stomach, and therefore it is toxic when ingested. It is also insoluble in alcohol. It dissolves in hydrochloric acid, glacial acetic acid, and diluted mixture of nitric acid and hydrogen peroxide.Contents1 Preparation 2 Chemical properties 3 Use 4 Physiological effects 5 History 6 References 7 External links // PreparationLead tetroxide is prepared by calcination of lead(II) oxide (also called litharge) in air at about 450 to 480 :6 PbO + O2 ? 2 Pb3O4 The resulting material is contaminated with lead(II) oxide. If a pure compound is desired, PbO can be removed by a potassium hydroxide solution:PbO + KOH + H2O ? K[Pb(OH)3](aq) Another method of preparation relies on annealing of lead carbonate (cerussite) in air:6 PbCO3 + O2 ? 2 Pb3O4 + 6 CO2 Yet another method is oxidative annealing of lead white:3 Pb2CO3(OH)2 + O2 ? 2 Pb3O4 + 3 CO2 + 3 H2O In solution, lead tetroxide can be prepared eg. by reaction of potassium plumbate with lead acetate:K2PbO3 + 2 Pb(OCOCH3)2 + H2O ? Pb3O4 + 2 KOCOCH3 + 2 CH3COOH yielding yellow insoluble lead tetroxide monohydrate, Pb3O4.H2O, which can be turned into the anhydrous form by gentle heating.Chemical propertiesWith iron oxides and with elementary iron, lead tetroxide forms insoluble iron(II) and iron(III) plumbates, which is the basis of the anti-corrosive properties of lead-based paints applied to iron objects.When heated to 500 , it decomposes to lead(II) oxide and oxygen. At 580 , the reaction is complete.2 Pb3O4 ? 6 PbO + O2 Nitric acid dissolves the lead(II) oxide component, leaving behind the insoluble lead(IV) oxide:Pb3O4 + 4 HNO3 ? PbO2 + 2 Pb(NO3)2 + 2 H2O UseLead tetroxide is most often used as a pigment for undercoat paints for iron objects. Due to its toxicity its use is being limited. In past it was used in combination with linseed oil as a thick, long-protecting anticorrosive paint. Also combination of minium and linen fibres was used for plumbing, now replaced with PTFE tape. Currently it is mostly used for manufacture of glass, especially lead glass. It finds limited use in some amateur pyrotechnics as a relatively potent oxidizer.Physiological effectsMain article: Lead poisoningWhen breathed in, lead tetroxide irritates lungs. In case of high dose, the victim feels metallic taste in mouth, chest pain, and abdominal pain. When ingested, it gets dissolved in the gastric acid and gets absorbed, leading to lead poisoning. High concentrations can be absorbed through skin as well; therefore it is important to keep the safety precautions when working with lead-based paint.Long-term contact with lead tetroxide may lead to accumulation of lead compounds in organism, with development of symptoms of acute lead poisoning. Chronic poisoning displays as agitation, irritability, vision disorders, hypertension, and usually also by grayish hue of face.Lead tetroxide was shown to be carcinogenic for laboratory animals. Its carcinogenicity for humans was not proven.Minium from a mine fire at Broken Hill, AustraliaHistoryLead tetroxide was used as a red pigment in ancient Rome, where it was prepared by calcination of lead white. In the ancient and medieval periods it was used as a pigment in the production of illuminated manuscripts, and gave its name to the minium or miniature, a style of...(and so on) To get More information , you can visit some products about commercial glass crushers, metals and plastics, . The GB Seamless stainless steel pipes products should be show more here!