Method for extracting molybdenum from sodium aluminate liquor
A technology of sodium aluminate and solution, applied in chemical instruments and methods, molybdenum compounds, inorganic chemistry, etc., can solve weak alkalinity and other problems, achieve comprehensive utilization, significant economic benefits, and simple and reasonable methods
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Embodiment 1
[0016] Sodium aluminate solution containing 150g / l of all alkali, 140g / l of alumina, 0.5g / l of molybdenum, carbon dioxide is introduced into the sodium aluminate solution, and the composition is 160g / l of all alkali, 0.2g / l of alumina, 0.6g of molybdenum The carbon fraction mother liquor of / l; The carbon fraction mother liquor crystallization evaporates, filters, obtains the total alkali 240g / l, the evaporate mother liquor of molybdenum 1.5g / l; The crystallization mother liquor of molybdenum 3.75g / l; cooling crystallization mother liquor evaporates again, obtains total alkali 240g / l, molybdenum 11.25g / l evaporates mother liquor; evaporates mother liquor and cools down to 5 ℃, cools and crystallizes, filters, and obtains total alkali 50g / l, Molybdenum 33.75g / l crystallization mother liquor. Add hydrochloric acid to the crystallization mother liquor to adjust the pH value to be acidic, and adjust the pH value to 0.8, and add ammonium chloride to obtain crude ammonium molybdate....
Embodiment 2
[0018] Sodium aluminate solution containing 220g / l of total alkali, 200g / l of alumina, 2g / l of molybdenum, carbon dioxide is introduced into the sodium aluminate solution, and the composition is 230g / l of total alkali, 1g / l of alumina, and 2.4g / l of molybdenum The carbon separation mother liquor; the carbon separation mother liquor is cooled to 10°C, cooled and crystallized, and filtered to obtain a crystallization mother liquor of 80g / l total alkali and 6g / l molybdenum; the cooling crystallization mother liquor is evaporated again to obtain 240g / l total alkali and 18g / l molybdenum The evaporated mother liquor; the evaporated mother liquor was cooled to 5° C., cooled and crystallized, and filtered to obtain a crystallized mother liquor with 50 g / l of all alkali and 54 g / l of molybdenum. Add hydrochloric acid to the crystallization mother liquor to adjust the pH value to be acidic, adjust the pH value to 2, and add ammonium chloride to obtain crude ammonium molybdate.
Embodiment 3
[0020] Sodium aluminate solution containing 240g / l all-alkali, 220g / l alumina, 4g / l molybdenum, carbon dioxide is introduced into the sodium aluminate solution, and the composition is 240g / l all-alkali, 1g / l alumina, 4.6g / l molybdenum The carbon fraction mother liquor; the carbon fraction mother liquor is cooled to 10 ℃, cooled and crystallized, and filtered to obtain the crystallization mother liquor of total alkali 80g / l and molybdenum 11.5g / l; the cooling crystallization mother liquor crystallized again and evaporated, filtered to obtain total alkali 240g / l, Molybdenum 57.5g / l evaporated mother liquor; evaporated mother liquor cooled to 5°C, cooled and crystallized, filtered to obtain crystallized mother liquor with 50g / l total alkali and 172.5g / l molybdenum. The crystallization mother liquor is added with hydrochloric acid to adjust the pH value to be acidic, and the pH value is adjusted to 2.5, and ammonium chloride is added to obtain crude ammonium molybdate.
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