Oxygen - enriched leaching test and application

2020-10-12 10:42

Introduction：Oxygen - en riched leaching test and application 1.Intensive leaching test at Welkom Gold Benefication Plantin South Africa Cyanide head ore is the belt gravity separationconcentrate.Leaching results are shown in table 8.1-3. Table 8.1-3 r

Oxygen - enriched leaching test and application

1. Intensive leaching test at Welkom Gold Benefication Plant in South Africa
Cyanide head ore is the belt gravity separation concentrate.Leaching results are shown in table 8.1-3.
Table 8.1-3 results of enhanced leaching test at Welkom Gold Benefication Plant in South Africa

metal	oxidant	leaching time /h		Initial leaching speeed/%·h^-1
metal	oxidant	leaching rate 90％	leaching rate 100%	Initial leaching speeed/%·h^-1
gold	oxygen air	3.0 13.5	4.5 20	37.0 27.5
silver	oxygen air	3.5 11.0	7.5 20	36.4 20.6

If the comparison is based on a leaching rate of 90%, these data show that the leaching time required for aerated leaching is three to four times that for oxygen use.The significance of this is that for a given size leaching vessel, the equipment will be three to four times as productive as the air filled when oxygen is used as an oxidizer.
2. Selwyn Mine in Queensland, Australia
Selwyn is a copper-gold benefication plant. The process is a combination of copper flotation and CIL.After adding hydrogen peroxide, the gold leaching rate of the factory was significantly increased, as shown in figure 8.1-1.
3.Dongping Gold Mine
In September 1994, Dongping Gold Mine Benefication Plant transformed the traditional air filling leaching process into oxygen-rich leaching process. The oxidant is the oxygen-rich gas with more than 90% oxygen content provided by the pressure swing adsorption (PASO) equipment.After the transformation, the production capacity of the original equipment was doubled due to the improvement of leaching speed, and the production indexes were shown in table 8.1-4.
Table 8.1-4 comparison of production indexes of air - filled leaching and oxygen - enriched leaching in Dongping Gold Mine

process	time	processing ore /t·d^-1	leaching time /h	head grade/g·t^-1	cyanide slag grade/g·t^-1	leaching rate /%
aerated Leaching	Jan to Dec ,1993 Jan tJune ,1993	330 355		3.88 3.56	0.43 0.38	88.92 89.33
oxygen-rich leaching	Oct to Dec,1994 Jan to Aug,1995	546 569		2.55 1.95	0.32 0.25	87.53 87.03

According to the investigation and calculation of the mine, the production capacity of equipment after oxygen enrichment leaching is increased from 300t/d to 600t/d, which is equivalent to the construction of a cyanidation system of the same size.By comparison, the production scale was expanded from 300t/d to 600t/d by two processes, and the construction investment could be saved by using oxygen-enriched leaching.The cost savings of production are also considerable: 1.143 million yuan per year for electricity, 0.36 million yuan per year for labor, and 105,000 yuan per year for cyanide.The annual benefit is 540 thousand yuan due to the improved recycling rate.
4. Zhangjiakou Gold Mine
In cooperation with Beijing Nonferrous Metallurgy Design and Research Institute, Zhangjiakou Gold Mine carried out small-scale and semi-industrial experiments of oxygen-enriched leaching from 1991 to 1993, and explored the adaptability of oxygen-enriched leaching technology to the gold-bearing oxidized ore containing poor sulfide.
The results show that the application of oxygen rich leaching technology to the ore containing gold from poor sulfide can double the leaching speed and increase the leaching speed by about 2% compared with conventional cyanidation.The same results were confirmed by semi-industrial tests.

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Oxygen - enriched leaching test and application