Barium cromate
Barium Chromate
CAS: 10294-40-3
Molecular Formula: BaCrO4
Barium cromate - Names and Identifiers
| Name | Barium Chromate |
| Synonyms | c.i.77103 C.I. 77103 Barium cromate BARIUM CHROMATE Barium Chromate c.i.pigmentyellow31 C.I. Pigment Yellow 31 barium dioxido(dioxo)chromium Barium Chromate, Puratronic (Metals Basis) |
| CAS | 10294-40-3 |
| EINECS | 233-660-5 |
| InChI | InChI=1/Ba.Cr.4O.2H/q;;;;2*-1;;/rBaH2.CrO4/c;2-1(3,4)5/h1H2;/q;-2 |
| InChIKey | QFFVPLLCYGOFPU-UHFFFAOYSA-N |
Barium cromate - Physico-chemical Properties
| Molecular Formula | BaCrO4 |
| Molar Mass | 253.3207 |
| Density | 4.5 g/mL at 25 °C (lit.) |
| Melting Point | 210 °C (dec.) (lit.) |
| Water Solubility | Insoluble in water. Soluble in strong acids. |
| Appearance | Powder |
| Specific Gravity | 4.5 |
| Color | Yellow |
| Exposure Limit | OSHA: Ceiling 0.1 mg/m3NIOSH: IDLH 15 mg/m3; TWA 0.0002 mg/m3 |
| Solubility Product Constant(Ksp) | pKsp: 9.93 |
| Merck | 14,972 |
| Stability | Stable. Oxidizer. May react vigorously with reducing agents. |
| Physical and Chemical Properties | There are two kinds of barium chrome yellow, one is barium chromate [CaCrO4], the other is barium potassium chromate, which is the compound salt of barium chromate and potassium chromate, the chemical formula is BaK2(CrO4)2 or BaCrO4, k2cro4. Barium chromate is a milk-yellow powder, soluble in hydrochloric acid and nitric acid, with extremely low coloring power. Barium chromate International Standard Code for ISO-2068-1972, the requirements of barium oxide content of not less than 56%, chromium trioxide content of not less than 36.5%. Barium potassium chromate is lemon yellow powder, because it contains potassium chromate, it has a certain water solubility, the relative density is 3.65, the refractive index is 1.9, the oil absorption is 11.6%, and the specific volume is 300g/L. |
| Use | Used in the production of safety matches, ceramics, glass pigments, etc. can not be used as a coloring pigment, because it contains chromate, so it is used for anti-rust paint in the role of similar zinc chrome yellow. Barium potassium chromate can not be used as a coloring pigment, only as anti-rust pigment, can replace part of the zinc yellow. From the development trend, it is only one of the varieties of chromate anti-rust pigments that can be used in the coating industry. |
Barium cromate - Risk and Safety
| Risk Codes | R49 - May cause cancer by inhalation R8 - Contact with combustible material may cause fire R20/22 - Harmful by inhalation and if swallowed. R43 - May cause sensitization by skin contact R50/53 - Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. |
| Safety Description | S53 - Avoid exposure - obtain special instructions before use. S36/37 - Wear suitable protective clothing and gloves. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S60 - This material and its container must be disposed of as hazardous waste. S61 - Avoid release to the environment. Refer to special instructions / safety data sheets. S28 - After contact with skin, wash immediately with plenty of soap-suds. |
| UN IDs | UN 1479 5.1/PG 2 |
| WGK Germany | 3 |
| RTECS | CQ8760000 |
| TSCA | Yes |
| Hazard Class | 5.1 |
| Packing Group | III |
| Toxicity | sce-ham:ovr 100 mg/L MUREAV 156,219,85 |
Barium cromate - Upstream Downstream Industry
| Raw Materials | Barium hydroxide |
Barium cromate - Nature
Open Data Verified Data
yellow monoclinic orthogonal crystal or crystalline heavy powder. Soluble in hydrochloric acid and nitric acid, insoluble in water, dilute acetic acid or collateral acid. D 4,50. Contact with reductant, Catalyst, combustible substance and organic substance to react vigorously.
Last Update：2024-01-02 23:10:35
Barium cromate - Preparation Method
Open Data Verified Data
potassium dichromate was dissolved in water and heated, sodium carbonate was added, filtered, and a solution of acetic acid and barium chloride was added until a precipitate of barium chromate occurred. After Suction filtration, washing with hot water and drying, barium chromate was obtained.
Last Update：2022-01-01 09:00:49
Barium cromate - Use
Open Data Verified Data
analytical reagent for the determination of sulfate, selenate, etc.
Last Update：2022-01-01 09:00:49
Barium cromate - Safety
Open Data Verified Data
high concentrations or repeated exposures cause weakness, paralysis of the limbs, heart, and respiratory system. If the skin or eyes come into contact with the substance, it should be immediately rinsed with clean water.
Last Update：2022-01-01 09:00:49
Barium cromate - Reference Information
| NIST chemical information | information provided by: webbook.nist.gov (external link) |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| solubility in water (g/100ml) | grams dissolved per 100ml of water: 2.775 × 10-4/20 ℃ |
| Use | barium chromate cannot be used as a coloring pigment. Because it contains chromate, it has a similar effect as zinc chrome yellow in rust preventive paint. Barium potassium chromate can not be used as a coloring pigment, only as anti-rust pigment, can replace part of the zinc yellow. From the development trend, it is only one of the varieties of chromate anti-rust pigments that can be used in the coating industry. used as a reagent for the determination of sulfate and selenate used in the production of safety matches, pottery, glass pigments, etc. determination of sulfate or selenate. Yellow pigment, ceramic, glass coloring. |
| production method | barium chromate can be reacted with barium chloride and precipitation, and the reaction equation is as follows: BaCl2 Na2CrO4 → acrob4 ↓ 2NaCl operation method: the equipment for the production of barium chromate is basically the same as that of zinc chrome yellow. The formula for the production of barium chromate is barium chloride [BaCl2 · 2H2O]: sodium dichromate [Na2Cr2O7 · 2H2O]: sodium hydroxide [NaOH]= 244:149:40, sulfate should be avoided in the raw material and the water used, so as to avoid the formation of insoluble barium sulfate mixed into the finished product to reduce the content of barium chromate in the finished product. Sodium hydroxide first reacts with sodium dichromate to generate sodium chromate. The amount of sodium hydroxide added should just neutralize the acidity of sodium dichromate, and more alkali should be prevented. Sodium chromate can be diluted to the relative density of 1.11 of the solution, and test for the presence of sulfate, such as sulfuric acid, can be added in advance a small dose of barium chloride, so that the formation of barium sulfate precipitation, after clarification or filtration. The barium chloride solution was added to the sodium chromate solution, and the barium chromate precipitate was generated by continuous stirring, until the filtrate of the precipitate was clear water, and the addition of the barium chloride solution did not produce precipitation. The resulting pigment slurry can be filtered with a filter press and washed with water until the wash water contains only a very small amount of chloride. Production of barium potassium chromate is dry, with barium carbonate powder with potassium dichromate powder mixed evenly in the converter calcination, the reaction equation is as follows: BaCO3 K2Cr2O7 → BaCrO4 · K2CrO4 CO2 operation method: the ratio of potassium dichromate to barium carbonate is 1.2:1.72, and it needs to be ball-milled in advance, then mixed, and calcined in a brick kiln. The initial calcination temperature is 350 ℃, and the calcination stage reaches 650~700 ℃, after the calcination of semi-finished products by cooling, after crushing, packaging. |
| category | toxic substances |
| toxicity grade | high toxicity |
| explosive hazard characteristics | reaction with reductant |
| flammability hazard characteristics | thermal decomposition of toxic barium and chromium oxides |
| storage and transportation characteristics | ventilation and low temperature drying; Separate storage |
| fire extinguishing agent | dry powder, foam, carbon dioxide, water mist |
| Occupational Standard | TWA 0.5 mg (barium)/m3; TWA 0.05 mg (chromium)/M3 |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-10 22:29:15
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Raw Materials for Barium cromate