Leaching of Niobium from Low-Grade Refractory Ore Using H2SO4 Roast System

Biao Wu; He Shang; Wen Cheng Gao; Jian Kang Wen

doi:10.4028/www.scientific.net/AMR.997.651

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 997Leaching of Niobium from Low-Grade Refractory Ore...

Leaching of Niobium from Low-Grade Refractory Ore Using H₂SO₄ Roast System

Abstract:

A new improved method is proposed for the leaching and extraction of niobium from a low-grade refractory niobium–tantalum ore.The ore was roasted and decomposed with concenrated H₂SO₄ then leached with dilute sulfuric acid. The effects of various factors, such as roasting temperature and time, acid to ore mass ratios,as well as particle size, on the dissolution kinetics of niobium were comprehensively investigated. The optimal conditions were particle size-38μm, roasting temperature 300°C,reacting time 2h and acid to ore mass ratio 1:1. The roasting residue reacted for 2 h with sulfuric acid in the ore/acid weight ratio of 3:1 at 90°C, the niobium was recoveried as high as 90.3%.

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Periodical:

Advanced Materials Research (Volume 997)

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651-654

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.997.651

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Online since:

August 2014

Authors:

Biao Wu*, He Shang, Wen Cheng Gao, Jian Kang Wen

Keywords:

Low-Grade Refractory Tantalum-Noibium Ore, Roasting, Sulfuric Acid Leaching

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