Preparation method for niobium oxide or tantalum oxide with low use amount of ammonia gas

Abstract

A preparation method for niobium oxide or tantalum oxide with low use amount of ammonia gas includes steps of adjusting a fluoniobate or fluorotantalate solution until the content of HF acid is 4 mol / L or above; organically using MIBK (methyl isobuty ketone 4-methyl-2-pentanon) or octanol solution; extracting fluorotantalate or fluoniobate into an organic solution by using a mode of counter-current extraction in an extracting tank with 6-12 levels, wherein the ratio of an organic phase to a water phase is 1: 3 to 3: 1; setting the extracted solution at 100-150 g / L; distilling and recycling theMIBK or octanol solution; continuing heating remaining white substances; feeding water vapor; adding gasoline or ethanol, feeding the solution into a combustion chamber in a spraying mode; controlling the temperature at 800-1200 DEG C to obtain white tantalum oxide or niobium oxide product; and washing and roasting at low temperature to obtain a final product. By the preparation method, the usingamount of the ammonia gas can be reduced, the cost is saved, and environmental protection is facilitated.

Description

technical field [0001] The invention belongs to the field of rare metal processing, and in particular relates to a method for preparing niobium oxide or tantalum oxide with low ammonia consumption. Background technique [0002] In the traditional tantalum-niobium hydrometallurgical process, it is necessary to use ammonia gas to react with fluoroniobic acid or fluorotantalic acid solution to form niobium hydroxide or tantalum hydroxide precipitates, which are washed, dried, and roasted to obtain niobium oxide. However, this process needs to consume a large amount of ammonia gas, and once the ammonia gas enters the water body, the treatment method is cumbersome and the operating cost is high, resulting in a large amount of ammonia-containing wastewater, which contains a large amount of fluorine, which is difficult to treat with ordinary processes . Because ammonia-containing wastewater is difficult to treat, and the cost is high, and the treatment is not complete at one time,...

AI Technical Summary

Problems solved by technology

However, this process needs to consume a large amount of ammonia gas, and once the ammonia gas enters the water body, the treatment method is cumbersome and the operating cost is high, resulting in a large amount of ammonia-containing wastewater, which contains a large amount of fluorine, which is difficult to treat with ordinary processes

Because ammonia-containing wastewater is difficult to treat, and the cost is high, and the one-time treatment is incomplete, it needs to be mixed and diluted with other wastewater before it can be discharged up to the standard.