The separation of gold and vanadium in carbonaceous gold ore by one-step roasting method

The separation of gold and vanadium in the refractory carbonaceous gold ore had been performed by one-step roasting method. The thermodynamic viability of the possible reactions in the process was analyzed based on thermodynamic data. And the effects of experimental parameters such as roasting tempe...

Full description

Saved in:
Bibliographic Details
Published in:Powder technology 2019-10, Vol.355, p.191-200
Main Authors: Wang, Hongjun, Feng, Yali, Li, Haoran, Kang, Jinxing
Format: Article
Language:English
Subjects:
Air temperature
Carbonaceous gold ore
Chlorination
Chlorination reaction
Flow rates
Flow velocity
Food processing
Gas flow
Gold
Gold and vanadium
Gold ores
High temperature
Low temperature
One-step roasting
Phase transitions
Pyrite
Reaction mechanisms
Recovery
Roasting
Separation
Sodium chloride
Sodium reaction
Vanadium
Viability
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The separation of gold and vanadium in the refractory carbonaceous gold ore had been performed by one-step roasting method. The thermodynamic viability of the possible reactions in the process was analyzed based on thermodynamic data. And the effects of experimental parameters such as roasting temperature, roasting time and NaCl dosage on the recovery ratios of gold and vanadium were investigated. Under the optimal conditions of NaCl 10%, roasting temperature 800 °C, roasting time 4 h and air gas flow rate 1 L/min, the recovery ratios of gold and vanadium were 92% and 85.34%, respectively, realizing the effective separation of gold and vanadium. In addition, the reaction mechanism and phase transformation during the roasting process were revealed using SEM, EDS and XRD. Results demonstrated that it was beneficial to the chlorination reaction of gold in the presence of pyrite. In the low-temperature roasting, the chlorination reaction of gold was dominant in the roasting process. And in the high-temperature roasting, the chlorination reaction of gold and the sodium reaction of vanadium were dominant in the roasting process. [Display omitted] •The possible reaction mechanism of the chlorination roasting is detailed discussed.•The chlorination roasting is performed to deal with the refractory carbonaceous gold ore.•The gold and vanadium in the refractory carbonaceous gold ore are efficiently separated.
ISSN:0032-5910
1873-328X
DOI:10.1016/j.powtec.2019.07.037