Bauxite typically from about 0.1% vanadium. In the process of producing alumina by Bayer process, 30% to 40% of vanadium is dissolved, and phosphorus , arsenic , iron, etc. are partially dissolved by sodium salt. The method of removing these impurities is to extract a solution in which V 2 O 5 is concentrated to a certain concentration (about 1 to 2.5 g/LV 2 O 5 ) to precipitate a sodium salt sludge containing V, P, and Fe. The sludge contains V 2 O 5 6% to 20%, and can be used as a raw material for recovering vanadium. Germany, France, Italy, Russia and other countries have such factories. Figure 1 shows the process for recovering vanadium from bauxite. The first half of the process is the sedimentation process of the sludge. The vanadium-containing sludge is dissolved in water and filtered, and the obtained filtrate can be obtained by an iron salt precipitation method or a calcium salt precipitation method to obtain crude vanadium. Figure 1 Flow of vanadium recovery from Bayer alkali leaching solution There are some newly developed methods such as activated carbon adsorption, solvent extraction, etc., and the sludge containing 20% ​​of V 2 O 5 is leached with hot water to obtain a solution containing V 10 g/L. 85 ° C, pH = 2 ~ 3, with activated carbon to adjust the slurry, can adsorb more than 90% of vanadium. Then, the slurry was slurried with ammonia water at 85 ° C for 1 h, and 80% of the vanadium was desorbed into the solution. Finally, vanadium is precipitated with an ammonium salt under acidic conditions. If solvent extraction is used, a secondary or tertiary amine extractant is used, O/A = 1/4, pH = 1.6, and the temperature is 35 to 40 °C. In the stripping, ammonia water was added at 0.5 mol/L, and O/A was 1.75/1. The stripping solution was further added with ammonium sulfate to obtain ammonium metavanadate precipitation. The final calcination gives V 2 O 5 and the purity is above 99%. With an experience of over 30 years, Helper created a new subsidiary who produce bakery and Pastry Making Machines which is applied in the processing of noodles, dumpling, pancake, bread, biscuits, Saqima, hamburgers, pizza, steamed buns, etc. Reliable quality and many patent technologies make Helper`s equipment success in this particular market. Made of stainless steel and meeting all health and hygiene standards is the principle of Helper`s machine designing. Bakery Making Machines,Fresh Noodle Production Line,Vegetable Processing Machines,Pastry Making Machines Shijiazhuang Helper Food Machinery Co., Ltd. , https://www.ihelpergroup.com