Preparation method of ultra-low potassium ammonium molybdate and ultra-low potassium derivatives thereof

By using high-temperature and high-pressure strong acid medium and compressed air in the molybdenum powder preparation process, combined with the treatment of ammonia water and ammonium sulfide, and the use of adsorbents, the removal rate of potassium in ultra-low potassium ammonium molybdate was successfully improved, the potassium residue problem in the prior art was solved, and efficient and economical ammonium molybdate preparation was achieved.

CN119284957BActive Publication Date: 2025-03-21SHAANXI HENGCHANG MOLYBDENUM CO LTD
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Patent Information

Application Number
CN202411813693.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-12-11
Publication Date
2025-03-21
Estimated Expiration
2044-12-11

AI Technical Summary

Technical Problem

The proportion of potassium residues in the existing molybdenum powder preparation process is relatively high, which affects product quality, and the removal rates of physical screening and pickling or water washing are relatively low in the prior art.

Method used

A strong acid medium with high temperature and high pressure is used and compressed air is introduced. Through the initial screening, crushing and sieving of calcined molybdenum concentrate, a uniform raw material is formed. Then, mixed with the acid solution in the reactor, heat up and adjust the pressure in the kettle, react for 3 to 5 hours, wash and solid-liquid separation after cooling, then add ammonia water and ammonium sulfide, mix and add adsorbent, and further remove potassium ions through concentration and crystallization to obtain ultra-low potassium ammonium molybdate.

Benefits of technology

It significantly improves the removal rate of potassium in ammonium molybdate, reduces the potassium content in ammonium molybdate, improves the purity and quality of the product, simplifies the operation process and reduces costs.

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Abstract

The present application relates to the field of hydrometallurgy technology, and specifically discloses a method for preparing ultra-low potassium ammonium molybdate and its ultra-low potassium derivatives. The method for preparing ultra-low potassium ammonium molybdate comprises the following steps: S1: pre-screening the roasted molybdenum concentrate, crushing, and then screening to obtain the raw material; S2: adding the raw material and pure water into the reactor, mixing evenly, adding acid solution, adjusting the pH, introducing compressed air, heating, adjusting the pressure in the reactor, cooling and depressurizing, washing, solid-liquid separation, and obtaining hydrated molybdenum trioxide; S3: mixing hydrated molybdenum trioxide with an ammonia solution, adding ammonium sulfide, mixing for 1 to 2 hours, after solid-liquid separation, then adding an adsorbent, mixing for 1 to 2 hours, cooling, and then aging for 24 to 48 hours, after solid-liquid separation, obtaining an ammonium molybdate solution; S4: concentrating the specific gravity of the ammonium molybdate solution, then cooling and crystallizing, solid-liquid separation, washing, and drying to obtain ultra-low potassium ammonium molybdate. The ammonium molybdate and its derivatives prepared in the present application have a lower content of potassium.
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