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Tungsten Alloy Counterweight for Sailboat 297

Tungsten alloy counterweight for sailboat has high specific gravity, good corrosion resistance and good wear resistance. It is widely used in ships and can ensure their balance and stability. It is favored by ship manufacturers at home and abroad. Characteristic Tungsten alloy counterweight for sailboat is made of high density tungsten alloy. Tungsten alloy has a high density, which is non-toxic and non-polluting. Its large weight and small size provide better stability for the ship. Applications Due to its good…

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Industrial Grade Sodium Tungstate 622

Industrial grade sodium tungstate is also known as technical pure (TP) sodium tungstate, whose purity is lower than that of guarantee grade (GR), analytical grade (AR), chemical purity (CP) and laboratory purity (LR). These grades are classified in accordance with different uses. The TP sodium tungstate is suitable for the laboratories which are not so strict on the purity requirements. There are many ways to control equipment corrosion in industrial cooling water systems, among which adding corrosion inhibitors is one…

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Sodium Tungstate Dihydrate 644

Sodium tungstate dihydrate may be prepared by different methods such as alkaline hydrolysis, crystallization, extraction, soda solution pressure cooking, and so on. Alkaline Hydrolysis to Prepare Sodium Tungstate Dihydrate Step 1: Wolframite ore is crushed to 320 mesh, and alkaline hydrolysis is carried out in reactor with 30% caustic soda. The reaction equation is as follows: MnWO4?FeWO4+4NaOH→2Na2WO4+Fe(OH)2?Mn(OH)2 Step 2: The reaction product obtained in step 1 is reacted with calcium chloride to obtain calcium tungstate. The reaction equation is as…

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Analytical Reagent Sodium Tungstate 554

Analytical reagent sodium tungstate is referred to as sodium tungstate that meets the purity standards, which ensures the scientific precision and reliability of chemical analysis, chemical reaction or physical testing. Coprecipitation Separation of Trace Impurities in Sodium Tungstate and Determination by ICP-AES Using lanthanum hydroxide as co-precipitant, trace metal impurity elements (calcium, cadmium, zinc, iron, manganese, nickel, and zinc) in sodium tungstate were coprecipitated, separated, enriched, and measured by ICP-AES (Inductively Coupled Plasma-Atomic Emission Spectrometry). Analytical reagent means the sodium…

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Sodium Tungstate Crystal 569

Sodium tungstate crystal may be prepared by the crystallization of sodium tungstate solution. Removal of Arsenic and Silicon from Sodium Tungstate Solution by Crystallization The removal of arsenic and silicon from impure Na2WO4 solution was investigated by crystallization using the liquors (m(As)/m(WO3)=0.32×10-3~2.94×10-3, m(Si)/m(WO3)=1.26×10-3~5.84×10-3) from middle-grade mixed wolframite and scheelite concentrate decomposed with NaOH by mechanical activation and tungsten residue leached by traditional digestion. The influences of the crystallization ratio and the addition of Al2O3 on removing impurities of As and…

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Sodium Polytungstate 737

Sodium polytungstate has been found to be used as heavy-liquid to separate and concentrate materials by density with the deepening of research. For example, it can be used to separate the worn carbon composites in brake pads. Sodium polytungstate is a kind of inorganic heavy-liquid with the characteristics of high density and cyclic utilization. And it is nontoxic and easily prepared. Also, the sodium polytungstate density separation operation is simple and stable, and most importantly the physic-chemical property of matter…

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Sodium Tungstate Solution 530

Sodium tungstate solution containing high impurities should be purified. Purification of Sodium Tungstate Solution with High Impurities Sodium tungstate solution out of sodium phosphate decomposition of scheelite contains high impurities. To solve this problem, the purifying effects of fluoride (F), phosphorous (P), silicon (Si) and arsenic (As) by basic magnesium carbonate was studied. Effects of basic magnesium carbonate dosage, pH value, reaction temperature, reaction time on impurities purifying were researched. The removal mechanism of impurities was also researched. The results…

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Reagent Grade Sodium Tungstate 385

Reagent grade sodium tungstate, RG sodium tungstate for short, may be applied for precision analysis and scientific research. Reagent-grade chemical substances are labeled red. There are a variety of chemical reagents, so that it is difficult to prepare them into multiple grades or different specifications at the same time. So, it is hard to obtain reagents of the required purity or grade sometimes. And therefore, it is of significance for users to know how to purify reagents. There are many…

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Tungsten Alloy for Centrifugal Clutch 186

Tungsten alloy for centrifugal clutch is one of the most commonly used types of clutches. It transmits torque through friction to control engine speed. It has high density, high temperature, wear resistance and good performance, which can meet the engine’s high speed requirements. Characteristic Tungsten alloy for centrifugal clutch is made of high density tungsten alloy material. Its main composition is W-Ni-Cu, W-Ni-Fe or W-Ni-Cu-Fe. The tungsten content is generally 90%~97%. Tungsten alloy has high hardness and good wear resistance,…

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Tungsten Alloy Crankshaft Rod 363

Tungsten alloy crankshaft rod has small size, high quality and long service life, which is non-toxic and non-polluting. It can save time and cost and is used to balance weight in automobile engine. Characteristic Tungsten alloy crankshaft rod has a higher melting point, a lower expansion coefficient, a density of 2 times that of steel, and 50% higher than lead. It has good corrosion resistance, elongation and mechanical processing properties. Connected to the lower end of the connecting rod, the…

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