A process called “cyanidation”, or cyanide leaching, has been the dominant gold mining technology since the 1970s. . Many chemicals are involved in the gold recovery process. Xanthates are not safe, diphosphates are toxic and are also leaching chemicals.
The only chemical that may not be toxic to humans is pine oil, which is used as a sparkling agent. Chemicals are widely used in gold mining processes. Every step of mining requires special chemicals for specific purposes. Typical gold mining processes are hydrometallurgical or pyrometallurgical.
Hydrometallurgical processes include the flotation and leaching process, while pyrometallurgical processes include the smelting and refining process. The chemicals used in these processes are classified as flotation reagents, leaching chemicals, foundry chemicals, and refining chemicals. Sodium cyanide briquettes packed in drums before export. Activated carbon packaging and loading.
Activated carbon is a crucial chemical during the cyanidation of gold. It is available in different sizes and CTC levels depending on the requirements of customers at their mine. Refractory gold ores and concentrates are characterized by low gold recovery and high cyanide consumption when subjected to direct cyanide leaching. Therefore, an oxidation pretreatment step is required prior to cyanidation, which will break the sulfide network and make gold particles accessible to cyanide ions.
Iron sulfide minerals should generally be activated with copper sulphate before adding a special collector or xanthate (PAX: potassium amyl xanthate) (but in some cases this may not be necessary). The main options for the treatment of refractory minerals and concentrates include a combination of traditional oxidation roasting, modern pressure oxidation, flotation, bacterial oxidation and cyanidation. During the flotation of the refractory mineral, a xanthate-based collector, a dithiophosphate collector, or a combination of these are used. Lime or sodium hydroxide (NaOH) are also used as pH modifiers depending on the characteristics of the mineral.
Copper sulphate is also used as an activator. The selection of foamers is also critical and more specific. However, the final reagent scheme adopted is specific to the mineral depending on the grade and varies from place to place. Chemicals used in the extraction and processing of minerals pollute land, water and air, causing health problems for workers and people who live near mines.
Since a tailings dam broke in the Baia Mare mine owned by the mining company Aurul in Romania in 2000, which leaked cyanide into the Somes River and killed large numbers of fish in Hungary and Yugoslavia, the use of cyanide has been strictly regulated in most countries and banned in others. In southern New South Wales (NSW) (Australia), a peach producer uprooted its 25,000 peach and nectarine trees after Unity Mining changed its proposal for the nearby Dargues Reef gold mine in Majors Creek to include a cyanide processing plant. Cyanide often spills into waterways during gold mining and when ponds full of mining waste burst and spill. Due to the variation of these refractory minerals, the presence of gold depends on each mineral and, before making decisions about the process, a competent mineralogical and metallurgical evaluation must be carried out before making final decisions on the process.
Mining news and detailed articles on the latest operations and projects of mining companies that cover mining exploration trends with up-to-date data on the most extracted metals and minerals. We have a variety of chemicals for mining, including flotation reagents, leaching chemicals and other mineral and mineral processing chemicals such as copper, lead, zinc, silver, gold and nickel. Accidents and spills usually only happen when a company doesn't design, build, and operate a mine safely, especially when it comes to the tailings dam. .