The oil phase is also called the oil agglomeration adhering gold. The initial research results of this process were invented by the Canadian Resource Development Research Council (CARBAD). Due to the continuous development of gold resources, high-grade gold deposits in many countries have been reduced, resulting in the recovery of fines from low-grade gold ore, old tailings and sands with very low gold content. Gold has become the main goal in the future. However, today's re-election, flotation method, etc. are not high for the recovery of fine gold particles in low-grade sand ore. How to use pre-treatment to enrich gold, and then metallurgy with conventional metallurgical methods has become increasingly important. This is why the oil agglomeration process has quickly entered the field of gold ore dressing .
The mechanism of oil collection in the oil agglomeration process has been discussed in Liu Jianjun et al. The essence is to add a collector such as isobutyl xanthate to the slurry as in the flotation operation, so that the gold particles and their continuum are hydrophobic, and then add neutral oil to make the hydrophobized particles enter the oil phase to form The gold agglomerates are then subjected to flotation, sieving, etc. to obtain gold-rich oil phase products. The use of oil-agglomeration gold process, the key to the operation process: First, according to the type and quantity of metal minerals in the raw materials, select the appropriate collector, pre-hydrophobic gold particles and their continuum, and inhibit other minerals without gold. Keeping it hydrophilic, which is a prerequisite for the selective capture of gold by the oil group; the second is to maintain a high stirring strength during the operation, so that the hydrophilic particles are discharged from the oil phase into the water phase by the shearing force of the fluid. To increase the selective adsorption of oil mass and the enrichment ratio of gold. For this reason, if the oil agglomeration method is used to treat raw materials containing high sulfide minerals, the sulfide minerals will be trapped in large quantities, resulting in a decrease in the gold grade of the oil concentrates.
Fu Nande equal to 1964 JR oil agglomeration method Quebec, a sulfur-containing ore is less than 3% (of which 90% pyrite), gold 0.6g / t of the ore tested. Because the natural gold particle size in the ore is 2 ~ 20μm, most of it is wrapped in pyrite, the ore is transferred to the ore from 85% to 0.074mm (200 mesh), and isobutyl xanthate is added to the slurry, and neutral oil is added. Stirring to form agglomerates, the oil concentrate obtained by sieving captures all sulfide minerals and monomer gold, the gold content is up to 35g ∕t, and the gold recovery rate is 95%. The concentrate is oxidized and calcined at 700 to 800 ° C and then cyanated and leached.
The Guangxi Institute of Metallurgy has selected 11 kinds of artificially prepared adhesives for oil-phase adhesion and gold-trapping. After the system test, A-type adhesives were selected and the vibrating adhesive grooves used with them were designed. The adhesive is prepared by a certain proportion of paraffin, paraffin oil and castor oil. In order to meet the temperature changes of different seasons and other body conditions, the formula can be adjusted to make it have the best hardness. And adhesion properties. This adhesive is suitable for ores and sand mines that do not contain sulfide minerals. When it is used to treat gold ore, the enrichment ratio of gold by one beneficiation is as high as 5000 to 61818 times, and the collection rate of gold on oil clusters can reach 93.33% to 98.32%. Industrial tests show that the gold grade of the oil concentrate has reached 42272kg∕t, the gold recovery rate is 99.5%, and the tailings contain gold of 0.054g∕t.
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