A new process for separating black and white tungsten
Because of the different floating characteristics of the wolframite and scheelite, the flotation agent used in the flotation is different from the pH value of the flotation medium. The flotation of the wolframite in the weakly acidic medium is good, and the scheelite flotation is better in the alkaline medium, and the two minerals are simultaneously floated by the mixed flotation process, so that the selection of the medicament and the pH value of the medium are both balanced, The flotation effect of scheelite and wolframite is not optimal. The ore dressing index of the wolframite ore is poor, the recovery rate is low, the recovery rate is only 15-20%, the recovery rate of the whole tungsten is restricted, and the recovery rate of the scheelite is generally about 65%. In recent years, the research on the separation of black and white tungsten has made great progress in the research of the separation of black and white tungsten from this kind of problem. A. New technology for separating and flotation of black and white tungsten by strong magnetic shunt The Beijing Institute of Mining and Metallurgy has proposed and adopted the "Separation and flotation process flow of strong magnetic shunt and black-and-white tungsten" to carry out the flotation of the sulfide ore first, the flotation tailings of the sulfide ore are subjected to strong magnetic separation (by adopting a high-gradient magnetic separator), the strong magnetic separation concentrate is subjected to black tungsten flotation, and the black tungsten concentrate is produced; The strong magnetic separation tailings enter the white tungsten flotation, and the white tungsten rough concentrate and the white tungsten rough concentrate are heated to produce white tungsten concentrate, and the white tungsten flotation tailings enter the fluorite flotation. in the process flow, the mineral composition of the ore pulp on both sides of the strong magnetic shunt is simplified, and when the black tungsten ore and the scheelite ore are respectively floated, the interference factor of the ore dressing is relatively reduced, different flotation conditions are prepared according to different characteristics of the black scheelite, and the process technology is mature and reliable; The adaptability of ore is strong, it is not affected by the change of the proportion fluctuation of black and scheelite, and the index of tungsten sorting is stable. On April 18,2009, on July 6,2009, the Beijing Mining and Metallurgy Research Institute conducted the on-site industrial test and industrial test technical index in the 380 mineral processing base of Shizhuyuan. The recovery rate of the crude ore is 76.52%, which is 10 percentage points higher than that of the original process. The process white-tungsten flotation does not need to add a combination inhibitor which is strong in the inhibition force of the fluorite, and creates conditions for the flotation of the fluorite; through the high-gradient strong-magnetic process, the weak magnetic minerals such as the cassiterite and the garnet are separated by using the magnetic characteristics, and the conditions are created for the recovery of the cassiterite in the non-magnetic mineral tailings. When the fine-grain-grade black-white-tungsten ore or the black-tungsten ore with higher proportion of the black-tungsten ore is processed, the ore-dressing process flow with strong magnetic separation and flotation is adopted, so that the grade and the recovery rate of the high-black tungsten concentrate can be obtained. B. Floating-magnetic-floating preferential flotation white-tungsten ore dressing process In the "Eleventh Five-Year Plan", the Guangzhou Non-ferrous Metals Research Institute proposed and studied the floating-magnetic-floating process. The process flow is as follows: the flotation tailing of the sulfide ore is subjected to deferrization, the white tungsten flotation is carried out after the concentration is concentrated, the white tungsten flotation tailings enter the strong magnetic separation (by adopting a high-gradient magnetic separator), the strong magnetic concentrate enters the black tungsten flotation after being concentrated, and the strong magnetic tailings enter the fluorite flotation. The flotation of scheelite and wolframite in their optimum floatable conditions was realized. The recovery rate of the tungsten-tungsten ore was 76.82% on April 4 to 16,2009. The actual recovery of tungsten is increased by 10 percentage points compared with the original process (black and white tungsten mixed flotation). due to the difference of the floatability between the scheelite and the wolframite, the ore pulp condition of the best flotation is different, and a part of the scheelite ore is the iron-containing scheelite, and has the weak magnetism and adopts a step-by-step mineral processing method of floating (white tungsten)-magnetic (black tungsten)-floating (black tungsten), At the same time, the white-tungsten-heated flotation tailings are returned to the high-gradient magnetic separator in the main dry process, so that the grade and the recovery rate of the white-tungsten concentrate are ensured, the flotation of the black tungsten is improved to the ore grade, the tail end is effectively reduced, and the subsequent black-tungsten flotation is more beneficial. The selective catching effect of the high-efficiency white-tungsten-collector TAB-3 on the iron-containing scheelite is good, and the dosage of the medicine is small. The effective separation of scheelite and wolframite is the key to the success of the process. By using the high-gradient strong magnetic separation process, the weak magnetic minerals such as the cassiterite and the wolframite can be separated by using the magnetic characteristics, and the comprehensive recovery of the tin-metal minerals is facilitated. The high-"floating-magnetic-floating" white-tungsten high-priority flotation process flow and the white-tungsten flotation tailings are subjected to strong magnetic separation, and the flotation grade and the recovery rate of the black tungsten are effectively improved under the condition of ensuring the grade and the recovery rate of the scheelite concentrate.
