According to 1970s studies suggest that its mechanism are basically two: one is a pair of xanthate xanthate oxidation product plays a major role; the other surface of the metal is gold minerals xanthates play a major role. The former is determined by a large number of electrochemical tests, the latter mainly by infrared spectroscopy. There are also secondary views, for example, some believe that it may be that the elemental elemental sulfur acts. PbS   +  2X -  → PbX 2 + S + 2e     The long-term electrolysis of the xanthate solution was carried out using galena as an electrode, and it was found that lead xanthate and xanthate were simultaneously formed, and the ratio of the two was between 3 and 0.5 , which was different with different galena electrodes. The sulfur ions in the crystal lattice are not formed into elemental sulfur under electrolysis conditions, but are oxidized to thiosulfate. The reaction is to form a layer of chemisorbed xanthate, then deposit several layers of double xanthate, and finally form lead xanthate and dihuang.  PbS      +     X 2 - - PbX 2 + S    If this is a bulk reaction,
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Structure and working principle:
Operation:
1. Before operation, check whether the transmission parts are loose, and remove any abnormal noise in time.
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   1973, Identification of the reaction product of the surface and galena xanthate is then extracted to make spectral characterization. The results of direct infrared spectroscopy were published in 1973. It was confirmed that only the metal xanthate was formed on the surface of galena, but no double xanthate.
The results of the potentiodynamic measurements published in 1974 showed that when lead xanthate was formed, lead excess or xanthate was excessive, and the measured potentials were different, the former being -20 mV and the latter being -50 mV , while the double xanthate was The potential is related to the pH value. When pH=7 , the potential is -70 mV , and when pH = 11 , the potential is -140 mV . The surface of the galena treated with xanthate has a dynamic potential close to lead xanthate, which is quite different from the double xanthate. At the time of actual measurement, the concentration of xanthate was higher than that of normal flotation. Therefore, it is considered that under normal flotation conditions, no xanthate is formed on the surface of galena.
A large number of electrochemical measurements showed that when the surface potential of galena was -0.2 V and 2.0 V , chemisorption occurred, and when the surface potential continued to increase above 2.0 V , a double xanthate was gradually formed. It is also known from experiments that the nitrogen bubbles do not adhere to the galena electrode of less than 2.0 V. When the surface potential is greater than 2.0 V , the nitrogen bubbles adhere, which proves that the presence of the double xanthate is favorable for the adhesion of the ore particles to the bubbles. The chemical adsorption reaction proposed by the electrochemical measurement results is:
Galena      Yellow drug ion Lead xanthate
In the 1930s , people tried to use the double xanthate as a collector . The results showed that the double xanthate had a trapping effect on the lead. However, on the surface of the galena, it is the direct physical adsorption of the double xanthate, or the chemical adsorption of the double xanthate to the galena surface, or even the chemical reaction to form lead xanthate, which has not been determined for a long time. In 1975 , studies on the surface effects of xanthate and xanthate on the surface of lead ore by radioisotope tracer showed that the chemical adsorption was lead xanthate, while the xanthate was only physical adsorption. Moreover, physical adsorption mainly occurs in the "anode region" of the galena surface. This physically adsorbed xanthate may diffuse into the "cathode zone." In the cathode region, the xanthate is reduced to form xanthate, and the possible surface reactions are:
Galena surface     Double yellow drug      Lead xanthate
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This machine is composed of peeling rollers, fans, and specific gravity sorting parts, with simple and compact structure, easy operation, stable performance, safety and reliability.
Working principle: Cocoa beans are fed, uniformly fed in the hopper, and peeled by rollers, then the ventilator sucks the peeled skins to the outside of the machine by wind for storage, and the peeled cocoa kernels pass through the material When the material is discharged from the mouth, by adjusting the size of the wind force and the size of the peeling gap, all the peels and kernels can be separated.
2. After the check is normal, turn on the fan first, and then turn on the rubbing roller. The opposite is true when shutting down.
3. Bake or bake the ingredients slightly before rubbing half of the ingredients, just rub the skin off with your fingers.
4. Start the suction fan to adjust the size of the air door of the suction duct according to the wind force, so that the thin skin can be sucked, but the nuts can not be sucked.
5. The size of the raw material particles is different, and the size of the rubbing gap should be adjusted at any time. The gap between the raw material particle size is large, and vice versa.
6. There are two adjusting handles in front of the roller to control the adjustment gap. The gap between forward rotation is large and the gap between reverse rotation is small.
7. After trial rubbing with a small amount of raw materials, adjust the gap after seeing the effect of rubbing the pieces of material
8. After using for a period of time, check whether the transmission parts and circuits are in good condition, and clean the dirt in time to avoid affecting normal use.