The plant was commissioned in 1974. The Bushweed mine is also used as a raw material. The ingredients (%) are as follows: ingredient V Fe TiO 2 SiO 2 % 0.92 55.6 12.7 2.2 The ore is firstly crushed to 30mm, dried, and then ground to 70%-0.09mm. Glauber's salt is added and granulated with Na 2 SO 4 to give a particle size of 10 to 12 mm. It is first dried on a grate machine, preheated to 900 ° C, and then calcined at 1270 ° C for 60-110 min in a rotary kiln, and the conversion rate is greater than 92%. It is believed that the use of V 5 + in the liquid reflux to catalyze the calcination can promote the conversion of trivalent vanadium and thenardite in the ore to soluble V 2 O 5 . The SiO 2 in the ore has a significant effect on the vanadium leaching rate. It can be seen from 1 that SiO 2 is more than 2.5%, which has a significant adverse effect. The combination of alkali and silicic acid increases with increasing temperature and time. Fig.1 Effect of silicon oxide on vanadium leaching rate 1- Add 7% Na 2 SO 4 ; 2 - Add 14% Na 2 SO 4 The calcined pellets are leached by countercurrent in the large-scale leaching tower connected in series, and the temperature has a significant influence on the leaching rate, as shown in Fig. 2. Increasing the temperature to 125 ° C can significantly shorten the leaching time. Figure 2 Effect of leaching temperature on vanadium leaching rate The obtained leach solution contains 35 to 70 g/LV, about 1 g/L SiO 2 , and the suspension is 3 to 7 g/L. Al 2 (SO 4 ) 3 was added in addition to silicon in an amount of 1.2 mol per mol of SiO 2 . When adding vanadium, the amount of (NH 4 ) 2 SO 4 is 1.2 mol per mol of V 2 O 5 , pH=7.5-9, and the temperature is 25-35 ° C, and the obtained ammonium metavanadate contains Na 2 O less than 0.1%. Decomposed in a rotary kiln and melted into V 2 O 5 fuses for sale. With magnetic iron ore directly vanadium and titanium oxide, sodium roasting, leaching the slag when high sodium, iron should not be reused as a raw material, iron material or only partially used, a major drawback of this law. Various products of Joint-hidden Roof Panel Roll Forming Machine, providing product images and basic parameters with each Joint-Hidden Roof Panel Roll Forming Machine and Roofing Panel Roll Forming Machine; We are a professional Chinese manufacturer of Joint-hidden Roof Panel Roll Forming Machine, and look forward to your cooperation! Joint Hidden Roll Forming Machine Joint Hidden Roll Forming Machine,Joint Hidden Roof Panel Forming Machine,Joint-Hidden Wall Panel Forming Machine Cangzhou Feiyang Machiney Manufacturing Co., Ltd. , https://www.coldformingmachines.com
Vas Paklov Vanadium Plant in Middelburg, South Africa
Vasparklof factory in Middelburg