1. Stone coal fluidized roasting-acid leaching-ion exchange process
Coal Research Institute of Changsha Hunan Nonferrous Metallurgy Design Institute developed fluidized roasting - acid leaching - ion exchange process has been used Hubei Stone Coal smelter (FIG. 1).
Figure 1 Flowing roasting-acid leaching-ion exchange method to extract vanadium
The main technical and economic indicators obtained by this new process semi-industrial test are: roasting acid leaching conversion rate of 67.03%, acid leaching recovery rate of more than 98%, ion exchange adsorption rate of more than 99%, leaching desorption rate of more than 99%, precipitation of vanadium The recovery rate of ammonium acid is more than 99%, the recovery rate of vanadium from raw material to product is about 65%, the working adsorption capacity of ion exchange resin is up to 420mg/g (wet resin), and the average concentration of eluent V 2 O 5 is about 100g/L. The quality meets the requirements of Class 99 of metallurgy in GB3283-87.
Second, stone coal salt-free roasting - acid leaching - solvent extraction
New process for extracting vanadium from stone coal without salt roasting-acid leaching-solvent extraction
The salt-free melt-smelting-acid-solvent extraction process jointly developed by Hunan Coal Research Institute and Xiangxi Shuangxi Coal Mine Vanadium Plant is shown in Figure 2. This process has been used in the industrial production of the Vanadium Plant in Shuangxi Coal Mine.
Figure 2 Process for extracting vanadium from salt-free roasting-extraction
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.
Third, acid leaching - intermediate salt method
New Process for Extracting Vanadium from Stone Coal Fluidized Combustion Ash Acid Leaching-Intermediate Salt Method
The new process for extracting vanadium from the coal-fired ash (or stone coal) acid leaching-intermediate salt method proposed by Zhejiang Research Institute of Chemical Industry is shown in Fig. 3.
Figure 3 Process of vanadium extraction by acid leaching-intermediate salt method
The main technical and economic indicators obtained in the semi-industrial test are: V 2 O 5 leaching rate 93.69%, intermediate salt recovery rate 99.07%, extraction rate 98.10%, stripping rate 98.16%, ammonium metavanadate precipitation rate 99.0%, V 2 O 5 total recovery rate is greater than 80%. The product quality meets the requirements of metallurgical class 98. Each ton of product consumes 30.46t of sulfuric acid, 7.5kg of P204, 60kg of TBP, 60kg of kerosene, 9.09t of ammonia, 20t of steam, 8000kW·h of electricity, and 48% of ammonium alum.
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