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Stone Coal Vanadium become an important direction of development of the use of vanadium resources . In order to effectively solve the resources in the field of stone coal vanadium , high energy consumption and serious environmental pollution problems , the implementation of energy conservation policies , the subject of new exploration of the key technologies of stone coal vanadium green technology and energy conservation . Vanadium Extraction of stone coal Experimental Study on the process conditions are optimized , mainly including the roasting process optimization, the leaching process optimization , extraction process optimization , the stripping process optimization , Shen the Vanadium process optimization . Roasting experiments , into the furnace temperature of 250 ° C , the calcination temperature of 850 ° C , the the CaO addition amount of 16 % the AF - QM add the amount of 1.5% , roasting time should 2.1h , the conversion rate of up to 80.1% vanadium . Leaching experiments , the liquid to solid ratio of 3:1, Assistant the infusion RTGJ add 0.3 % , leaching temperature of 90 ° C , the leaching time 1.5h, sulfuric acid concentration of 4.5% , the leaching rate of up to 85.2% . The extraction experiments , pH = 3.0 , the extraction stages 5 , compared to 1:1, the oscillation time 2min, the extraction rate of up to 99.1% . Organic phase and water compared 8:1,6 level stripping stripping experiments , sulfuric acid concentration of 10% , 98.5% stripping . V2O5 experiment , the pH value of 2.0, V2O5 temperature of 90 ° C , V2O5 deposition time 2.5h, precipitation rate up to 95.0% . The final products the V2O5 reach the national standard GB3283-87 99 . Stone coal vanadium key technologies including energy conservation and waste water recycling, emission standard , solid waste comprehensive utilization of waste heat utilization several aspects . Process wastewater raffinate , the ammonium metavanadate wash water , Shen vanadium tail water . The ammonium metavanadate direct return to the granulation process wash water ; Shen vanadium tail water sand filtration two reverse osmosis treatment and reuse ; the raffinate water using membrane separation and flotation process to do wastewater recycling . Process emissions mainly calcined the fumes and calcined exhaust , roasting flue gas the bag dust swirl board scrubber desulphurization process ; calcined exhaust pollutants NH3, dilute hydrochloric acid for absorption liquid absorption cycle . The slag leaching slag , purification slag , gypsum slag leaching slag and gypsum slag for concrete admixtures , can improve the performance of concrete ; purification residue hazardous waste disposal . Roaster roasting decarburization used in industrial applications , to boil steam produced by the boiler can be used to generate electricity .
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