Preparation method and device of high-purity tellurium dioxide
A tellurium dioxide preparation device technology, applied in the direction of binary selenium/tellurium compounds, selenium/tellurium oxides/hydroxides, etc., can solve the problems of affecting the environment, insufficient product purity, and the lack of precise control of the amount of hydrogen peroxide, etc., to achieve The effect of improving efficiency and ensuring purity
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Embodiment 1
[0015] Embodiment 1: as figure 1 Shown, a kind of preparation method of high-purity tellurium dioxide comprises the following steps:
[0016] a, oxidation reaction, adopt hydrogen peroxide to oxidize 4N tellurium powder, use flow pump 15 to accurately control the addition and addition rate of hydrogen peroxide, add hydrogen peroxide and 4N tellurium powder to reaction tank 1 to carry out oxidation reaction, the liquid-solid ratio of hydrogen peroxide and 4N tellurium powder The control is 2.5-3.5:1, and the concentration of hydrogen peroxide is controlled between 10% and 25%;
[0017] B, purify, add cleaning agent by the dose of 2g / L in the solution obtained after carrying out oxidation reaction in reaction tank 1, and cleaning agent is organic flocculant, after adding cleaning agent, pass stirring bar 9 and stirring blade in reaction tank 1 10 Fully stir, then stand still, and filter the sediment through a pipeline filter after standing;
[0018] c. Concentrate and crystall...
Embodiment 2
[0021] Embodiment 2: Same as the above embodiment 1, wherein the reaction tank 1 is provided with a hydrogen peroxide concentration detection sensor, and the hydrogen peroxide concentration detection sensor is wirelessly connected to the flow pump 15 .
Embodiment 3
[0022] Embodiment 3: Same as the above embodiment 1, wherein a liquid level sensor is provided at the lower part of the hydrogen peroxide storage tank 13, and a liquid replenishment pipe 21 is provided at the top of the hydrogen peroxide storage tank 13.
[0023] The present invention precisely controls the dosage of hydrogen peroxide through the flow pump 1513, so that 4N tellurium powder is oxidized in hydrogen peroxide with a concentration of 10%-25%, without causing local overoxidation and ensuring the quality of the product. During the oxidation process, the stirring rod 9 Drive the stirring blade 10 to stir, so that the 4N tellurium powder is fully contacted with hydrogen peroxide. After the oxidation is completed, add the organic flocculant through the addition funnel 17 in a dose of 2g / L, then stir, and let stand to make the iron, copper, nickel, zinc, etc. The oxides of impurities are polymerized and precipitated, filtered through the pipeline filter, and discharged th...
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