Continuous preparation method of ammonium heptamolybdate
A technology of ammonium heptamolybdate and ammonium molybdate, which is applied in the field of continuous preparation of ammonium heptamolybdate, can solve the problems of unstable quality, low purity and poor solubility of ammonium heptamolybdate products, and achieve good fluidity and high product quality. Stable quality and good solubility
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[0022] The invention provides a kind of continuous preparation method of ammonium heptamolybdate, comprising the following steps:
[0023] Step 1, dissolving: get the ammonium dimolybdate aqueous solution with the mass ratio of ammonium dimolybdate: deionized water=1:1, wherein the mass percentage of molybdenum in the ammonium dimolybdate is not less than 56%; to the ammonium dimolybdate aqueous solution Add ammonia water with a concentration of 25%, the reaction temperature is 70°C, and the pH is 6.8-7.2 to obtain an ammonium molybdate solution;
[0024] Step 2, concentration: the ammonium molybdate solution obtained in step 1 is evaporated and concentrated, and the density of the ammonium molybdate solution is controlled to be 1.36-1.4g / cm 3 , pH is 6.3-6.8, obtains ammonium heptamolybdate solution;
[0025] Step 3, filtering: the ammonium heptamolybdate solution obtained in step 2 is filtered to remove impurities;
[0026] Step 4, crystallization by cooling: inject the am...
Embodiment 1
[0029] Get the mass ratio as ammonium dimolybdate: deionized water=1:1 ammonium dimolybdate aqueous solution, wherein the mass percentage of molybdenum in ammonium dimolybdate is 56.23%; add concentration to be 25% ammoniacal liquor in the ammonium dimolybdate aqueous solution , the reaction temperature is 70°C, the pH is 6.8, and the ammonium molybdate solution is obtained; the ammonium molybdate solution is evaporated and concentrated, and the density of the ammonium molybdate solution is controlled to be 1.36g / cm 3 , pH is 6.3, obtains ammonium heptamolybdate solution; The ammonium heptamolybdate solution is filtered to remove impurities; The ammonium heptamolybdate solution after filtering and removing impurities is injected into the cooling crystallizer for cooling crystallization, and the injection volume is cooling crystallizer 75% of the full liquid level, control the stirring speed to 120r / min during the cooling and crystallization process, and the crystallization temp...
Embodiment 2
[0032] Take the mass ratio as ammonium dimolybdate: deionized water=1:1 ammonium dimolybdate aqueous solution, wherein the mass percentage of molybdenum in ammonium dimolybdate is 56.21%; add concentration to be 25% ammoniacal liquor in the ammonium dimolybdate aqueous solution , the reaction temperature is 70°C, the pH is 7.2, and the ammonium molybdate solution is obtained; the ammonium molybdate solution is evaporated and concentrated, and the density of the ammonium molybdate solution is controlled to be 1.4g / cm 3 , pH is 6.8, obtains ammonium heptamolybdate solution; The ammonium heptamolybdate solution is filtered to remove impurities; The ammonium heptamolybdate solution after filtering and removing impurities is injected into the cooling crystallizer for cooling crystallization, and the injection volume is cooling crystallizer 80% of the full liquid level, control the stirring speed to 130r / min during the cooling and crystallization process, and the crystallization temp...
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Abstract
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