The method of recovery of Vanadium
Vanadium solid wastes contain many important economic value of the metal, should be positive to recycling, waste, the harm to benefit, so as to create considerable economic benefits and social benefits.
1. Recovery of Vanadium from the waste Vanadium catalyst.
The waste catalyst containing Vanadium are divided into two types:
One is used for refining desulphurization catalyst in petroleum refining, desulfurization process, the Vanadium in crude oil in the form of V3S4 deposition on catalyst. The other is the catalyst for sulfuric acid industry, Vanadium catalyst in contact sulfuric acid production process, the sulfur dioxide into three sulfur trioxide. Due to the use of the process, the gas with water, fog, dust and arsenic, fluorine has toxic effect on it, tetravalent Vanadium the active component of five of two Vanadium conversion of non activity, if the tetravalent Vanadium ratio reached a certain level, causes the Vanadium catalyst failure, which need to be replaced.
2. Recovery of Vanadium from vanadiferous asphalt.
Asphalt tar oil, the tar used as fuel in the ashes, Vanadium in Vanadium raw materials, can be used as. With the NaOH solution leaching, when the concentration of NaOH reached 30%, and the fuel ash ratio reaches a certain value, in the range of 100 to 110 ℃ hybrid 2h, the leaching rate of Vanadium can reach 94%. After filtering, the sodium vanadate solution is neutralized with sulfuric acid to pH = 8, adding ammonium salts obtained Ammonium Metavanadate precipitation, recovery rate of close to 85%. Ammonium Metavanadate sediment is filtered after drying, calcining to obtain V205. After Vanadium precipitation liquid containing 0.2 to L G / L V, the pH = 5 the remaining solvent recovery, exchange of Vanadium by anion, the Vanadium concentration in the filtrate to 1mg / L.
3. Recovery of Vanadium from alumina production.
Bauxite is usually also contain a small amount of Vanadium. With the Bayer process of bauxite, due to the effect of alkali, about 30% of Vanadium into leaching solution. When the aluminum hydroxide from sodium aluminate solution precipitation, Vanadium in the mother liquor, leaching operation returns the bauxite, so that the Vanadium in solution concentration.
Vanadium in solution enriched too much on aluminum production is harmful, in addition to the precipitation so must use slow cooling or air way of Vanadium in Vanadium containing sludge form. The Vanadium containing mud called Bayer mud, five oxidation which contained 6 to 20% two V, can be used as raw material for extracting Vanadium.
1. Recovery of Vanadium from the waste Vanadium catalyst.
The waste catalyst containing Vanadium are divided into two types:
One is used for refining desulphurization catalyst in petroleum refining, desulfurization process, the Vanadium in crude oil in the form of V3S4 deposition on catalyst. The other is the catalyst for sulfuric acid industry, Vanadium catalyst in contact sulfuric acid production process, the sulfur dioxide into three sulfur trioxide. Due to the use of the process, the gas with water, fog, dust and arsenic, fluorine has toxic effect on it, tetravalent Vanadium the active component of five of two Vanadium conversion of non activity, if the tetravalent Vanadium ratio reached a certain level, causes the Vanadium catalyst failure, which need to be replaced.
2. Recovery of Vanadium from vanadiferous asphalt.
Asphalt tar oil, the tar used as fuel in the ashes, Vanadium in Vanadium raw materials, can be used as. With the NaOH solution leaching, when the concentration of NaOH reached 30%, and the fuel ash ratio reaches a certain value, in the range of 100 to 110 ℃ hybrid 2h, the leaching rate of Vanadium can reach 94%. After filtering, the sodium vanadate solution is neutralized with sulfuric acid to pH = 8, adding ammonium salts obtained Ammonium Metavanadate precipitation, recovery rate of close to 85%. Ammonium Metavanadate sediment is filtered after drying, calcining to obtain V205. After Vanadium precipitation liquid containing 0.2 to L G / L V, the pH = 5 the remaining solvent recovery, exchange of Vanadium by anion, the Vanadium concentration in the filtrate to 1mg / L.
3. Recovery of Vanadium from alumina production.
Bauxite is usually also contain a small amount of Vanadium. With the Bayer process of bauxite, due to the effect of alkali, about 30% of Vanadium into leaching solution. When the aluminum hydroxide from sodium aluminate solution precipitation, Vanadium in the mother liquor, leaching operation returns the bauxite, so that the Vanadium in solution concentration.
Vanadium in solution enriched too much on aluminum production is harmful, in addition to the precipitation so must use slow cooling or air way of Vanadium in Vanadium containing sludge form. The Vanadium containing mud called Bayer mud, five oxidation which contained 6 to 20% two V, can be used as raw material for extracting Vanadium.
stevia - 26. Dez, 07:04
