Enrichment of gold-bearing ores
Gold, the first most popular precious metal, which consistently holds the leadership among precious metals, is the object of intensive search for new solutions to optimize complex technological processes of extraction from ores.
The enrichment of gold-bearing ores is a complex process that involves a number of steps aimed at separating gold-bearing minerals and gold.
Current Challenges
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Trends in the depletion of readily available gold reserves gold
Increased complexity and cost of extraction from more inaccessible deposits.
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Ensuring sustainable development of the industry
Optimizing ore processing processes and improving the economic efficiency of mining operations are becoming critical factors.
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Environmental issues
Extraction and concentration of gold-bearing ores can have a negative impact on the environment, so the use of environmentally friendly and resource-saving methods is required.
Enrichment
The enrichment of gold-bearing ores is a complex task that requires the application of modern technologies that take into account a variety of parameters.
The efficiency and economic viability of the gold ore beneficiation process is a complex task and directly depends on the choice of the optimal beneficiation method, which is dictated by a number of factors: ore type, gold content, mineral composition, particle size, as well as geological and geographical conditions of the deposit.
The X-ray absorption (XRT) method, also known as X-ray density separation, is a promising technology for the pre-processing of gold-bearing ores. Its principle is based on differences in the absorption of penetrating X-rays by minerals. Gold and gold-bearing minerals absorb X-rays much more strongly than most associated rock and sulfide minerals (e.g., quartz, feldspar, pyrite, etc.). This difference in absorption is utilized to separate XRT separation of gold-bearing ore chunks - “rough concentrate” - from waste rock - “tailings” - without the use of chemical reagents. This process significantly reduces the volume of ore to be processed.
Possibilities of X-ray absorption (XRT) separation of gold-bearing ore
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A piece of “dump tailings” and its radiographic image during pre-processing of sulfide gold-bearing ore of -100 +50 mm size class
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A piece of “rough concentrate” and its X-ray image in the pre-processing of sulfide gold-bearing ore of -100 +50 mm size class
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Example of processed radiographic image of a sample of “empty” rock of -50+25 mm size class. Gold (Au) content - 0.00 g/t, silver (Ag) - 0.30 g/t
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Example of processed radiographic image of a sample of “rough concentrate” of -50+25mm size class of sulfide gold-bearing ore. Gold (Au) grade - 3.02 g/t, silver (Ag) grade - 23.29 g/t
Advantages of X-ray absorption (XRT) separation of gold bearing ore:
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High efficiency
XRT separation works effectively with ores of different mineral and particle size distribution. In pre-processing XRT separation allows to increase the gold content in the concentrate, which is especially important in case of low gold content in ore and its fine distribution.
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Cost-effectiveness
XRT separation enrichment significantly reduces the volume of material to be further processed, which reduces energy consumption, transportation costs and subsequent enrichment stages.
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Environmental friendliness
XRT separation does not use chemicals and does not pollute the environment.
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Versatility and performance
XRT separation can be applied to treat various types of gold bearing ores in an automated process.
Application of X-ray absorption (XRT) separation of gold bearing ore:
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Ore processing
XRT separation is used for the pre-processing of gold-bearing ores prior to conventional gold recovery methods, and is particularly effective in treating low-grade ores with fine gold.
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Tailings processing
XRT separation enables the beneficiation of ore from tailings after conventional ore processing, improving overall ore utilization efficiency and significantly reducing the loss of valuable raw materials.
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Processing of fines
XRT separation is effective in separating gold from the fine ore fraction, allowing extra gold to be recovered that would be lost using other methods.
Conclusion
The X-ray absorption (XRT) separation technology of IC Burevestnik is a promising method of enrichment of gold-bearing ores, which allows increasing the efficiency of gold recovery, reducing costs and improving environmental safety. The range of X-ray absorption separators manufactured by IC Burevestnik allows to implement XRT-technology at deposits for different ore size classes and processing plants.
