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Ling tide gold ore is quartz vein MYLONITE oxide deposits of the mineral component is simple, quartz gangue more than 90%, mainly metallic minerals limonite ore, magnetite and hematite. Natural gold is mostly fine (-0.074mm), 64.4% is found in the pores of limonite, 10.4% is present in the cracks and grains of quartz, but also 25.5% is encapsulated in quartz crystal. The ore contains gold 3g∕t, silver 2g∕t.
The mine was completed and put into operation in 1981, with a scale of 1500t. The site is first leveled and compacted with a bulldozer, and trimmed into a stack of about 5% slope with three sides high and low to the middle sink. The upper layer of polyethylene plastic film is placed on the upper layer, and then a layer of oil felt is applied. Rain drains. A pile of low-grade large-sized ore with a thickness of about 300mm is piled under the pile, and then a pile of about 3m in height and height of about 50m is built in the pile of about 50mm, each pile is about 1500t.
After leaching, the shower head is sprayed with lime water for 5 to 10 days until the liquid is discharged at pH 10 to 11, and then the leaching solution containing NaCN 0.03% to 0.05% pH 10 to 11 is sprayed. The amount of liquid spray is 10 to 20 L ∕ m 2 · h, and the leaching time is 30 to 60 d. The leaching rate of gold is 62.50% to 66.33%.
The precious liquid contains gold in the range of 3 to 4.6 g/m 3 , and gold is adsorbed in series with 3 to 4 φ 300 × 1200 mm carbon columns. Each column is filled with activated carbon 25-30 kg, the solution flow rate is 1-3 L/min, and the gold adsorption rate is 97.09%-98.03%.
The gold-bearing charcoal contains 9kg/t of gold. It is desorbed at 95 °C for 2-6 hours using a solution containing NaCN5% and NaOH 2%, and washed with 10 volumes of water for 10 hours. The desorption rate of gold is 98.13%. Gold desorption solution 300g / m 3, using a titanium plate cathode electrode spacing 35mm, cell voltage 3 ~ 3.5V, the cathode area of the current 15 ~ 20A / m 2 even under electrolysis Article 24 ~ 48h, the recovery of the gold is electrodeposited 98.06 %. The sponge gold scraped from the cathode is smelted by fire, and the resultant gold ingot is gold containing more than 90%.
The tail liquid after electrolysis contains about 6 g ∕m 3 of gold, and after purification, it is returned to the washing for desorbing carbon.
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Changzhou ErBang Drying Equipment Co., Ltd. , https://www.hywellmachinery.com