High-efficiency, low-consumption and fast desorption electrolysis system
2020-03-07 Xinhai (1051)
2020-03-07 Xinhai (1051)
Desorption electrolysis system The complete set of equipment includes: desorption column, electrolyzer, electric heater, desorption tank, filter, electric control cabinet, rectifier cabinet , Circulating pump, activated carbon regeneration kiln, etc. The high-efficiency, low-consumption, fast desorption electrolytic carbon gold extraction system is used for the treatment of gold-carrying carbon in the carbon slurry plant of gold mines. The gold can be separated from the gold-loaded carbon and precipitated into high-grade gold mud, which is necessary for the production of finished gold.
Gold electrolysis is carried out in leaching and stirring tank in an acid-resistant porcelain tank or plastic tank, or a glass fiber reinforced plastic tank. Conductive rods and conductive bars are usually made of pure silver. The hook of the anode plate is pure gold. The electrolyte does not circulate, only a small air pump (or vacuum pump) is used for blowing and stirring. Since high current density can be used under high temperature and high acid conditions, electrolysis is generally performed under high acid and high temperature. In addition to heating by current, it can also be heated by water bath, sand bath or air bath under the electrolytic cell. (Amalgamation board)
In the process of electrolysis, the cathode may be blackened due to low acidity or precipitation of impurities; or polarization due to the relative density of the electrolyte is too high and the temperature of the solution is too low, and green flocs of gold and copper are precipitated on the cathode. In severe cases, green crystals cover the entire cathode. At this time, add hydrochloric acid to the electrolyte according to the situation, and replace part or all of the electrolyte; at the same time, take out the cathode, clean the green flocculent crystals, and put it into the electrolytic cell for electrolysis. When the voltage or current is too high, the cathode will also turn black. (Choose gold jig)
The gold electrolytic anode slime contains more than 90% silver chloride and 1%-10% gold. It is often returned to the fused-cast gold-silver alloy anode plate for power supply to dissolve silver. It can also be melted in a furnace and then decanted Divide. The silver chloride slag is reduced and smelted by adding sodium carbonate and carbon, cast into a crude silver anode plate for silver electrolysis, and the gold is returned to the cast gold anode. When the gold anode mud contains osmium and iridium ore, the osmium iridium can be separated by sieving method and then the gold and silver can be recovered. (Gold mine flotation machine)
When replacing the electrolyte, take out the waste electrolyte, remove the anode sludge, and clean the electrolytic cell before adding new electrolyte. The waste electrolyte and washing liquid are all filtered and washed for dry anode mud. The waste electrolyte and washing liquid are generally first reduced with sulfur dioxide or ferrous iron, and then replaced with zinc to recover platinum group metals until the solution is clarified. Filter, discard the filtrate, leaching the filter residue with 1:1 dilute hydrochloric acid to remove iron and zinc, and send it to refined platinum group metals. When the platinum and palladium content in the waste electrolyte is very high, the gold can be reduced with ferrous chloride first, and then the platinum and palladium can be separated. The platinum can also be precipitated as ammonium chloroplatinate with ammonium chloride, and then neutralized with ammonia to pH 8-10 is used to hydrolyze base metals, and then acidified with hydrochloric acid to pH 1, palladium is precipitated as dichlorodiamine palladium. The remaining liquid is replaced with iron or zinc to recover the remaining precious metals and then discarded.
The characteristics of Xinhai analysis electrolysis system are:
(1) Under the conditions of high temperature (150°C) and high pressure (0.5MPa), the desorption rate reaches more than 98%;
(2) The desorption electrolysis temperature is the same, and no heat exchange is required. Because of the fast work, the power consumption is 1/4～1/2 of the conventional system;
(3) The non-toxic desorption combination medicament contains carbon activator, which can regenerate the carbon, and the lean carbon does not need to be regenerated by fire, which saves the cost of carbon regeneration;
(4) No cyanide: no need to add sodium cyanide in the desorption solution, low cost and less pollution;
(5) Gold mud is of high grade, no need for reverse electrolysis, easy to extract;
(6) Safety: It has triple safety protection measures, that is, the system's own intelligence, automatic pressure limiting and pressure release mechanism, and insurance safety valve.
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