Oxalic Acid Preparing Pyrochlore Tungsten Trioxide

Oxalic acid is metabolite of the organism, it is widely distributed in plants, animals and fungi in the body, and it plays different functions in different living body. Industrial oxalic acid is colorless monoclinic crystal or prism sheet or white powder; it is usually odorless oxidation oxalic acid. Its sublime is in 150 ~ 160 ℃. Oxalic acid can be used as bleaching agent, reducing agent, mordant, and it has rust function.

Oxalic acid as an additive for preparing pyrochlore type tungsten trioxide, the first steep is configuring concentration of 100g / L of sodium tungstate solution 10mL, adding an appropriate amount of oxalic acid, adjusting the pH value of the solution about 7.0, the second steep , the sodium tungstate solution is transferred to a low pressure reaction vessel, maintaining constant temperature at 140 ℃ , conditions reaction 24h, measuring the reaction rate of the solution according to the concentration of tungsten trioxide. The resulting solution is filtered and treated; water as well as the spent ion alcohol is washed 2-3 times, drying it to obtain finished pyrochlore type tungsten trioxide.

It was found that the highest rate of decomposition of oxalic acid as an additive tungstate sodium in hot water system can reach about 60%, and the reaction is faster, the decomposition rate closes to the maximum. The decomposition rate has been around 60% of small amplitude fluctuations. It exploded a short time in the entire hot water system; it is suitable for industrial production applications.

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