Sodium Molybdate Solution CAS 7631-95-0

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Sodium molybdate solution, mainly composed of sodium molybdate, an inorganic substance, with the chemical formula of Na2MoO4, is a white rhombic crystal. Molybdenum trioxide can be produced by oxidation roasting of molybdenum concentrate, and sodium molybdate can be produced by leaching with liquid alkali, and then it can be prepared after suction filtration, concentration, cooling, centrifugation and drying. White crystalline powder. At 100 ℃, 2 molecules of crystal water are lost. Dissolve in 1.7 parts of cold water and about 0.9 parts of boiling water. The pH of 5% aqueous solution is 9.0 ~ 10.0 at 25 ℃. Relative density (D184) 3.28. Melting point 687 ℃. Median lethal dose (mice, abdominal cavity) 344mg/kg. Irritating.

Sodium molybdate can precipitate with heavy metal salts: BaMoO4 (white), femoo4 (dark brown), cumoo4 (green), Ag2MoO4 (white), PbMoO4 (white), etc. Sodium molybdate is toxic, but it is a low toxic compound. Molybdenum poisoning can cause joint pain, low and fluctuating blood pressure, neurological disorders, and metabolic disorders. The maximum allowable concentration of soluble molybdate aerosol is 2mg/m and that of dust is 4mg/m. Wear specified protective equipment when contacting and using sodium molybdate. Pay attention to moisture protection. It shall be protected from rain and sun during transportation. It is used as precipitant, catalyst and molybdenum salt for manufacturing alkaloids, inks, fertilizers, molybdenum red pigments and sun resistant pigments. It can also be used for manufacturing flame retardants and metal inhibitors for pollution-free cold water systems. It can also be used as galvanizing, polishing agents and chemical reagents.

Melting point 687 ° C (lit.), Density 3.78 g/ml at 25 ° C (lit.), Refractive index 1.714, Form powder, Specific gravity 3.28, Color white, It is soluble in water, Sensitivity hygroscopic, Merck 14,8645, Stable Incompatible with strong oxidizing agents., InChIKeyTVXXNOYZHKPKGW-UHFFFAOYSA-N, Hazard description h303-h332, Precautions p261-p271-p304+p340-p312a, Dangerous goods sign Xi, Hazard category code 36/37/38, Safety instructions 26-36, WGK Germany 1, RTECS No. qa50750, TSCA Yes.

Sodium molybdate solution is second only to molybdate, which is widely used in chemical industry, catalyst, corrosion inhibitor, enamel, pigment and other trace elements. In recent years, with the increase of the demand for sodium molybdate in the foreign market, the domestic output is also increasing year by year. According to effective statistics, the annual export output is more than 4000 tons. Synthetic sodium molybdate: it can be obtained by melting the mixture of molybdenum trioxide and sodium carbonate in the laboratory. In industry, the raw molybdenite (main component MoS2) is oxidized and roasted to produce coarse molybdenum oxide, washed with nitric acid to remove impurities, then dissolved in sodium hydroxide aqueous solution, heated and concentrated to obtain sodium molybdate dihydrate Na2MoO4 · 2H2O. When heated to 100 ℃, it becomes anhydrous.

Sodium molybdate (chemical formula Na ₂ MoO ₄) is a white crystalline powder with weak alkaline aqueous solution characteristics, which has shown unique value in a wide range of applications in industry, agriculture, medicine, environmental protection, and other fields.

Industrial sector: From metal protection to high-end manufacturing

 

1. Metal corrosion inhibitors
It is a key additive in the circulating cooling water system, which forms a composite film of iron high iron molybdenum oxide on the metal surface through anodic passivation mechanism, effectively inhibiting the corrosion of metals such as steel, aluminum, and copper. Typical application scenarios include:
Automotive industry: Adding 0.1-0.2% sodium molybdate to ethylene glycol based coolant can simultaneously protect engine steel parts, aluminum cylinder heads, and copper radiators from heat transfer corrosion and cavitation corrosion.
Electric power industry: used for boiler feedwater treatment. After compounding with polyphosphate and zinc salts, the dosage can be reduced from traditional dosage of 200-500mg/L to 4-6mg/L, significantly reducing treatment costs.
Petrochemical field: In high-temperature and high-pressure heat exchangers, a protective film with a temperature resistance of up to 300 ℃ is formed by synergistic action with gluconate, which is suitable for corrosion control in refining units.

 

2. Electroplating and surface treatment
Galvanizing process: When used in combination with jasmonal, it can increase the brightness of the coating by 30% and reduce the concentration of cyanide in the plating solution, which meets environmental protection requirements.
Lubricant additive: In the preparation of molybdenum dithiophosphate (MoDTP), 180-220kg of sodium molybdate is consumed per ton of product, significantly improving the anti-wear performance of engine oil. The lubricant developed by Japan Steel Pipe Company for pipe pulling contains 1kg of sodium molybdate per 100kg formula, which extends the life of the mold by 40%.
Metal Forming: Polymer solid lubricants containing sodium molybdate are applied in the production of cold-rolled steel plates, which can reduce roll wear by 25% and prevent metal surface oxidation.

 

3. Catalysts and chemical raw materials
Petroleum refining: As a precursor for hydrogenation desulfurization catalysts, it can reduce the sulfur content of diesel to below 10ppm in catalytic cracking units, meeting the national VI emission standards.
Pigment synthesis: Reacts with copper sulfate to produce dark green CuMoO ₄ precipitate, which is used to manufacture inorganic pigments such as molybdenum chromium red and molybdenum orange. Its light resistance is twice that of traditional pigments.
Paper industry: Adding 0.5% sodium molybdate in sulfate pulp bleaching can reduce the amount of hydrogen peroxide by 30%, while removing heavy metal impurities such as iron and manganese, and improving pulp whiteness by 2-3 ISO grades.

Environmental Protection Field: Water Treatment and Pollution Control

 

1. Circulating water treatment
As a new type of phosphate free corrosion inhibitor, it has the following advantages:
Low dose and high efficiency: In the circulating water system of steel plants, the combination of 4mg/L sodium molybdate and 2mg/L benzotriazole can reduce the corrosion rate of carbon steel to below 0.02mm/a.
Thermal stability: In locally overheated areas with a heat flux density of 500kW/m ², a stable passivation film can still be maintained, suitable for cooling systems in nuclear power plants.
Biodegradability: Compared with traditional chromate salts, the LD50 value (intraperitoneal injection in rats) of this product is 576mg/kg, which belongs to low toxicity substances and meets the requirements of REACH regulations.

 

2. Wastewater treatment
Heavy metal removal: Sodium molybdate forms insoluble precipitates with heavy metal ions such as Pb ² ⁺ and Cd ² ⁺. In the treatment of electroplating wastewater, the lead content can be reduced from 50mg/L to below 0.1mg/L.
Organic degradation: As a Fenton reaction catalyst, it can accelerate the decomposition of hydrogen peroxide, increase the COD removal rate of printing and dyeing wastewater to 75%, and shorten the treatment time to one-third of traditional processes.

 

3. Meal detergent formula
The environmentally friendly dish wash developed in Germany contains 300mg/L sodium molybdate, with a washing index of 10 (the standard formula is 4), and also has the following functions:
Chelate calcium and magnesium ions: soften water quality, reduce detergent usage by 20%
Inhibiting metal corrosion: protecting the surface smoothness of aluminum tableware
Collaborative disinfection: Combined with sodium perborate, the killing rate of Escherichia coli is increased to 99.99%

Agricultural field: Trace element nutrition and soil improvement

 

1. Fertilizer additives
As a source of molybdenum, it has a dual role in agriculture:
Yield increase of leguminous crops: In soybean cultivation, foliar spraying with 0.05% sodium molybdate solution can increase pod setting rate by 15-20% and protein content by 2-3 percentage points.
Soil remediation: Applying sodium molybdate to acidic red soil can activate fixed phosphorus, increase effective phosphorus content by 30%, and reduce aluminum ion toxicity.
2. Feed additives
Adding 50mg/kg sodium molybdate to ruminant animal feed can:
Promote rumen microbial synthesis of vitamin B ₁₂
Improve cellulose digestion rate by 8-10%
Prevent copper poisoning (molybdenum and copper form insoluble complexes, reducing copper absorption)

Medical field: Diagnostic reagents and nutritional supplements

 

1. Alkaloid determination
As a chromogenic agent, it has high sensitivity in drug analysis:
Morphine detection: Reacts with morphine to form a yellow complex, which is detected at a wavelength of 420nm with a detection limit of 0.1 μ g/mL
Phosphorus content determination: In phosphate fertilizer detection, the sodium molybdate ascorbic acid system can control the measurement error of effective phosphorus in superphosphate within ± 0.5%

2. Nutritional fortifiers
Although sodium molybdate is not directly used as a food additive, it is used as a raw material for the preparation of:
Medical molybdenum supplements: for the treatment of gouty like syndrome caused by molybdenum deficiency, the daily dose should be controlled at 50-100 μ g
Radioactive protective agent: In the production of molybdenum-99 isotopes, sodium molybdate is used as a precursor for the target material in the preparation of medical technetium-99m generators

Expansion of Emerging Application Fields

 

1. Energy materials
Fuel cell catalyst: Doped platinum carbon catalyst can reduce the overpotential of methanol oxidation reaction by 50mV and increase power density by 15%
Lithium ion battery: Introducing sodium molybdate into LiFePO ₄ cathode material can increase the capacity retention rate from 85% to 92% at 0.2C rate
2. Nanotechnology
Quantum dot synthesis: As a stabilizer, CdSe quantum dots with a particle size of 2-5nm can be controlled for preparation, with a fluorescence quantum yield of 65%
Photocatalytic material: Sodium molybdate TiO ₂ composite catalyst degrades methylene blue at a rate 3.2 times faster than pure TiO ₂ under visible light

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