Barium carbonate is an inorganic compound with chemical formula of BaCOthree, white powder, insoluble in water, soluble in strong acid, toxic, widely used.
Chinese name
barium carbonate[3]
Foreign name
Barium carbonate[3]
chemical formula
BaCOthree[3]
molecular weight
one hundred and ninety-seven point three three six[3]
Barium carbonate, chemical formula BaCOthree, molecular weight 197.336.White powder.Insoluble in water, density 4.43g/cmthree, melting point 881 ℃.It decomposes at 1450 ℃ and emits carbon dioxide.Slightly soluble in water containing carbon dioxide, also soluble in ammonium chloride or ammonium nitrate solution to form complex, soluble in hydrochloric acid and nitric acid to emit carbon dioxide.Toxic.Used in electronic, instrument and metallurgical industries.Preparation of fireworks, flares, ceramic coatings, optical glass accessories.It is also used as rodenticide, water clarifier and filler.[1]
toxicology data
Announce
edit
Acute toxicity: LDfifty: 418mg/kg (rat by mouth);200mg/kg (mouse by mouth)
Subacute and chronic toxicity: rats inhaled barium carbonate dust for one month, and had elevated blood pressure, changes in the number of red blood cells and white blood cells, weight loss, reproductive toxicity and embryotoxicity.[1]
Preparation method
Announce
edit
Carbonization method
The barium carbonate slurry is obtained by carbonizing the barium sulfide solution with carbon dioxide.After desulfuration washing, vacuum filtration, drying at 300 ℃, crushing, the finished product of barium carbonate is obtained.
BaS+COtwo+HtwoO=BaCOthree+HtwoS
Complex decomposition method
The finished product of barium carbonate is obtained by the double decomposition reaction of barium sulfide and ammonium carbonate, followed by washing, filtering, drying, etc.
BaS+(NHfour)twoCOthree=BaCOthree+(NHfour)twoS
Barium chloride can also be reacted with potassium carbonate to produce:
BaCltwo+KtwoCO3=BaCOthree↓+2KCl
Poisonous and heavy petrochemical method
The witherite ore powder is reacted with ammonium salt to generate soluble barium salt, and ammonium carbonate is recycled. The soluble barium salt is added to ammonium carbonate to precipitate refined barium carbonate, which is filtered and dried to produce finished products.The mother liquor obtained can be recycled.
BaCOthree+2HCl=BaCltwo+HtwoO+COtwo↑
BaCltwo+2NHfourOH=Ba(OH)two+2NHfourCl
Ba(OH)two+COtwo=BaCOthree↓+HtwoO[1]
Calculate chemical data
Announce
edit
Reference value for drainage parameter calculation (XlogP): None
Number of hydrogen bond donors: 0[3]
Number of hydrogen bond receptors: 3[3]
Number of rotatable chemical bonds: 0[3]
Number of tautomers: 0
Topological molecular polar surface area: 63.2[3]
Number of heavy atoms: 5[3]
Surface charge: 0[3]
Complexity: 18.8[3]
Number of isotope atoms: 0[3]
Determine the number of atomic structure centers: 0[3]
Number of uncertain atomic structure centers: 0[3]
Determine the number of chemical bond structure centers: 0[3]
Number of uncertain chemical bond structure centers: 0[3]
Number of covalent bond units: 2[1]
security information
Announce
edit
Dangerous transport code: UN 1564 6.1/PG 3
Dangerous goods mark: Xn
Safety sign: S24/25
Hazard sign: R22[2]
purpose
Announce
edit
The auxiliary materials for ceramic coatings and optical glass are used in the manufacture of electronic ceramics, PTC thermistors, capacitors and other electronic components.Analyze iron in calcium, magnesium, manganese and zinc.Determination of halogens in organic compounds.It is used for making barium salt, pigment, fireworks, rodenticide pottery, and as filler and water clarifying agent.For catalyst.The production of electronic ceramics and purified water, and the production of pigments, coatings or other barium salts for optical glass and barium magnetic materials are important chemical raw materials for the production of picture tube glass shells, magnetic materials and advanced optical glass.It can also be used to treat the excessive sulfate radical in chromium plating electrolyte, white passivation solution for zinc coating, and waste water.[2]
danger
Announce
edit
Barium carbonate is a barium salt with strong toxicity. Barium carbonate will accumulate on bones, causing proliferation of bone marrow leucocyte tissue, thus causing chronic poisoning.Moreover, barium carbonate will react with hydrochloric acid in gastric juice and become soluble barium chloride. Barium chloride belongs to soluble barium salt and is a toxic substance. If it is not rescued in time, it will be poisoned quickly and even die in serious cases.LD of barium carbonatefiftyAbout 418mg/kg.For patients with acute barium carbonate poisoning, measures such as gastric lavage, enema, and taking emetics are usually taken to expel barium carbonate from the body.At the same time, it can also react with the soluble barium chloride formed in gastric juice by taking potassium sulfate, which can change the toxic barium into insoluble barium sulfate precipitation and reduce the toxicity.The reason for using potassium sulfate is that barium carbonate poisoning may lead to hypokalemia.
First aid measures
Announce
edit
Skin contact: Take off the contaminated clothes and wash the skin thoroughly with soapy water and clean water.
Eye contact: Lift the eyelid and flush with flowing water or physiological saline.Get medical attention.
Inhalation: quickly leave the site to a place with fresh air.Keep the respiratory tract unobstructed.If breathing is difficult, give oxygen.If breathing stops, perform artificial respiration immediately.Get medical attention.
Ingestion: drink enough warm water to induce vomiting.Use 2%~5% sodium sulfate solution for gastric lavage and catharsis.Get medical attention.
Fire fighting measures
Announce
edit
Hazard characteristics: no special combustion and explosion characteristics.
Fire extinguishing method: This product is nonflammable.Extinguishing agent: water, sand.
Leakage emergency treatment
Announce
edit
Emergency treatment: isolate the leakage contaminated area and restrict access.It is recommended that emergency personnel wear dust masks (full face masks) and gas suits.Do not touch the leakage directly.Small amount of leakage: avoid raising dust and collect it in a dry, clean and covered container with a clean shovel.Large amount of leakage: covered with plastic cloth and canvas.Then collect and recycle or transport to waste disposal site for disposal.
Operational disposal
Announce
edit
Closed operation, local exhaust.Operators must be specially trained and strictly abide by the operating procedures.It is recommended that operators wear self-priming filter type dust masks, chemical safety goggles, gas suits and rubber gloves.Avoid dust generation.Avoid contact with acids.Load and unload gently during transportation to prevent damage to packaging and containers.Provide leakage emergency treatment equipment.Empty containers may leave harmful substances.
Exposure control and personal protection
Announce
edit
Engineering control: closed operation, local exhaust.Provide safety shower and eyewash equipment.
Respiratory system protection: self suction filtering dust mask must be worn when it may be exposed to dust.In case of emergency rescue or evacuation, it is recommended to wear an air respirator.
Eye protection: wear chemical safety goggles.
Body protection: wear anti poison clothing.
Hand protection: wear rubber gloves.
Other protection: smoking, eating and drinking are prohibited at the work site.After work, take a shower and change clothes.Store the clothes contaminated by poisons separately and use them after washing.Keep good hygiene habits.
Storage and transportation information
Announce
edit
Precautions for storage: store in a cool and ventilated warehouse.Keep away from kindling and heat sources.Packing and sealing.It shall be stored separately from acids and edible chemicals, and mixed storage is strictly prohibited.The storage area shall be equipped with appropriate materials to contain the leakage.[1]
Packaging method: fiberboard bucket, plywood bucket and cardboard bucket outside the plastic bag or two-layer kraft paper bag;Plastic bucket outside the plastic bag (solid);Plastic bucket (liquid);Two layers of plastic bags or one layer of plastic bag outer gunny bags, plastic woven bags, latex cloth bags;Composite plastic woven bag outside the plastic bag (polypropylene three in one bag, polyethylene three in one bag, polypropylene two in one bag, polyethylene two in one bag);Screw mouth glass bottles, iron cap pressure mouth glass bottles, plastic bottles or ordinary wooden boxes outside metal barrels (cans);The threaded glass bottle, plastic bottle or tinned sheet steel barrel (can) is covered with a full floor lattice box, fiberboard box or plywood box.
Precautions for transportation: during railway transportation, the dangerous goods shall be loaded in strict accordance with the dangerous goods loading table in the Dangerous Goods Transportation Rules of the Ministry of Railways.Before transportation, check whether the packaging container is complete and sealed. During transportation, ensure that the container does not leak, collapse, fall or damage.It is strictly prohibited to mix with acids, oxidants, food and food additives.The transport vehicle shall be equipped with leakage emergency treatment equipment during transportation.During transportation, it shall be protected from sun exposure, rain and high temperature.
