Western Research Institute and Hunan coal mine Sungai vanadium plant to develop a non-salt was calcined - acid leaching - solvent extraction process shown below. This process has been used in the industrial production of the Vanadium Plant in Shuangxi Coal Mine.
Figure Salt-free roasting-extraction method for vanadium extraction process
The technical conditions for extraction are: organic phase N 263 15% + octanol 3% + sulfonated kerosene 82%, extraction stock pH is about 7, compared to O / A = 1/2, mixing time 3 min, the number of stages is 1 .
The technical conditions for stripping are: stripping the aqueous phase NH 3 ·H 2 O+NH 4 Cl, compared to O/A=2, the mixing time is 3 min, and the number of stages is 1.
The main technical indicators obtained by this process are (%): the roasting conversion rate is greater than 55, the acid leaching recovery rate is about 98, the ignition recovery rate is about 98, and the total recovery is about 50.
Since no additives are added during calcination, the production cost of the process is reduced by 20% to 25% compared to conventional processes. At the same time, the pollution of flue gas during salt roasting is avoided, and the amount of vanadium-containing wastewater is also greatly reduced.
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