Pyrite many cases in symbiosis with other mineral form, is the most widely distributed sulfide crust formed under various geological conditions, pyrite can exist in a variety of fields because of stabilization of the Fe2 + The electronic configuration allows it to enter the octahedral field composed of sulfur ions to obtain larger crystal field stabilization energy and additional adsorption energy. Therefore, pyrite can be formed and stabilized under a variety of different geological conditions.
In addition to the influence of the crystal structure, chemical composition and surface structure of pyrite on its floatability, many studies have also shown that the ore-forming conditions of the pyrite deposit, the formation characteristics of the ore, the structure and structure of the ore, etc. It also has an impact. Shi Tongyuan's chemical analysis of pyrite from 13 different deposits in Japan indicated that the S/Fe ratio of each sample fluctuated within the range of 1.93 to 2.06. The closer the S/Fe ratio is to the theoretical value of 2, the yellow iron The better the floatability of the mine. The paper studies the floatability of pyrite in eight different producing areas. It is considered that the use of sulfur-iron ratio to judge its floatability has certain limitations. The floatability of pyrite is also related to its semiconducting properties. Related to chemical composition. The relationship between the two is: the pyrite with high S/Fe ratio is an N-type semiconductor, the temperature difference electromotive force is negative, the floatability is poor, and it is easily suppressed by Na2S and Ca2+ plasma; the S/Fe ratio is close to the theoretical value 2 It is a P-type or an N-type semiconductor. It has good buoyancy in an acidic medium and a poor floatability in an alkaline medium. Pyrite with a low S/Fe ratio is a P-type semiconductor, and the thermoelectric potential is large. It has good buoyancy and is difficult to be inhibited by Na2S, Ca2+, etc., but it is poor in buoyancy in acidic media.
Short-chain xanthate is a traditional collector of pyrite, and its hydrophobic product is dihuang. Under the action of xanthate, pyrite is easy to float in an acidic medium with a pH of less than 6, but different studies have shown that the floatability is worse or better floated at a pH of 6-7. Ling Jinghong and other studies have shown that this phenomenon is related to the treatment of mineral samples. Under alkaline conditions, the floatability of pyrite decreases with increasing pH.
The activator of pyrite is generally sulfuric acid, and may also be activated by Na2CO3 or CO2. The mechanism of action is as follows: one is to lower the pH value of the solution, so that the Ca2+, Fe2+, Fe3+ plasma forming complex or insoluble salt on the pyrite surface is desorbed from the pyrite surface and enters the solution to restore the fresh surface of the pyrite; The second is that the surface of the pyrite is difficult to be oxidized due to the presence of the activator, so that the inhibited pyrite is activated and floated. When the surface of the pyrite is oxidized deep, it can be activated by Cu2+. The mechanism may be substituted for the lattice Cu2 + Fe2 + in the surface of the copper sulfide-containing film is generated thereby enhancing the adsorption of xanthate pyrite; but when pyrite collector adsorption or by lime inhibition deeper, the need It can be activated by CuSO4 in acidic medium or after acid cleaning. Lime is often used to increase the pH of the slurry and inhibit iron sulfide minerals.
Planetary Reducer Hybrid Stepper Motor
42 Stepper Motor,Brushless Dc Motor,2 Phase Stepper Motor,Planetary Stepper Motor
Changzhou Hebe Interantional Trade Co., Ltd , https://www.hebe-motion.com