Appliable Materials: cement,new-type building material,fertilizer,non-ferrous metal,copper mine,construction rubbish etc. All grindable materials, various metal ores, non-metallic ores, non-flammable and explosive materials
Mercury extraction increased from 10 pct at 0.34 lb NaCN per ton of solution to 40 pct at 20 lb NaCN per ton of solution. Currently, cyanide mill operators add 0.02 to 2 lb NaCN per ton of solution. Some gold producers are interested in in creasing mercury recovery; to others, mercury is a nuisance.
In mercury precipitation tests in a ball mill, CaS was added to the slurry in the mill along with cyanide and lime. The slurry mixture was ground for 45 min, washed from the ball mill with water, and leached for periods of up to 24 h at 25 pct solids. Additional mercury precipi
2006-2013; total mercury (THg) concentrations ranging 3-6 g/L was measured in 6 out 70 sampling events. These Hg concentrations measured in land and water bodies are believed to be coming from the wastewater discharges of ball mill facilities in the area. Perez and Appel (2007) estimated that there are about 50 ball mill facilities in
Nov 01, 2014 Ball mill grinding is the most efficient but also the most expensive step to liberate gold. It requires high energy and high investment. ... The mercury-cyanide contamination generated by the processing centres is a far more complex problem with significant social roots. A deeper investigation and intervention in processing centres is needed to ...
Feb 01, 2014 On average, 46% of the mercury introduced in the ball mills are discharged as losses with tailings or leached with cyanide, and four per cent -- when amalgams are burned. The loss with tailings is due to the formation of small droplets of mercury (known as “flouring”) when mercury is submitted to long grinding periods.
- cyanide emissions-deficient tailings management-devastation of land, riverbanks; erosion ... - use of mercury in sluice-boxes - use of mercury in mills (ball mills, Chilean mills, stone mills) - use of amalgam plates - use of mercury in centrifugal concentrators 1. Mercury emission in the traditional primary ore processing
After grinding the ore to 60%-0.074 mm, the amalgamation plate was installed to recover coarse gold at the discharging end of the ball mill and the overflow place of the classifier respectively, and the recovery rate of gold in mercury process was about 20%.
One was always losing mercury- it's estimated there are 15 million pounds in the Carson River alone, from the 200 mills working the Comstock. Interestingly, since mercury is not as efficient as cyanide, they estimate much gold and silver was lost with the mercury- as high as 3 million ounces of gold and 64 million ounces of silver.
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