Oxidized gold ore refers to gold-bearing ore that has undergone oxidation reactions in the surface or near-surface oxidation zone due to exposure to oxygen or other oxidizing agents. Common beneficiation methods include gravity concentration, flotation, cyanidation, and heap leaching.
From raw ore to finished gold ingots, gold ore undergoes seven core processes: crushing and screening, grinding, pre-leaching, carbon leaching, cyanide removal and pressure filtration, electrolytic desorption, and smelting. Each step is interconnected, ultimately achieving gold extraction and purification while simultaneously ensuring the harmless treatment of tailings.
The primary methods for processing white tungsten ore include gravity separation, magnetic separation, chemical beneficiation, and flotation. Flotation can be further divided into ambient-temperature flotation and heated concentration.
After years of development, chemical beneficiation of wolframite has evolved into a variety of mature processes, including hydrochloric acid decomposition, caustic soda leaching, soda solution pressure cooking, and fluoride salt decomposition. Each process has its own unique principles, operational procedures, and suitable applications.
The white tungsten ore flotation process has become the dominant technology for recovering white tungsten ore resources due to its strong adaptability to fine-grained, low-grade, and polymetallic ores. Its core principle lies in exploiting the differences in surface physicochemical properties between white tungsten ore and gangue minerals. Through reagent optimization and process design, these differences in mineral floatability are amplified to achieve efficient concentration and separation of white tungsten ore.
The scheelite flotation process typically consists of two core stages: roughing and cleaning. For some complex ores, a pretreatment stage is added. Each stage has a clear division of labor and works in concert to ultimately achieve efficient enrichment of scheelite.
Wollastonite is mostly found in quartz vein-type deposits. Due to its high specific gravity, brittle physical properties, and susceptibility to mud formation, coupled with its complex mineral composition, wolframite beneficiation presents numerous challenges. Based on the core principle of "early and abundant recovery, and thorough removal of fine mud," wolframite beneficiation has formed four core stages.
The core of upward backfill mining for gold mines is "bottom-up layered mining with simultaneous mining and backfilling." After the lower layer of ore is mined, the goaf is immediately filled with backfill material. Once the backfill reaches its design strength, it serves as a support and working platform for the next layer of mining.
In the field of scheelite beneficiation, flotation is currently the most widely used and effective technology. With the decreasing availability of high-grade, easily beneficiated resources, the efficient recovery of low-grade, high-impurity scheelite has become a focus of the industry, and flotation processes are constantly being iterated and upgraded.
Tungsten in scheelite often fuses with molybdenum, copper, and other elements, making separation difficult. Molybdenum, in particular, shares similar chemical properties with tungsten, leading to even more problems and challenges in separation.
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