bactech bioleaching plant now orr wants bactech which has been financially challenged of late to split into two companies one that focuses on gold extraction and another to rectify environment
in general in a solvent extraction operation elemental sulfur is dissolved from the ore by the solvent at an elevated temperature the sulfur-solvent system is clarified of gangue and solvent and sulfur are separated by crystallization of sulfur and/or vaporization of solvent to result in a sulfur product and solvent for recycle.
sulfur is a component of gunpowder ("black powder"). fertilizer. sulfur is increasingly used as a component of fertilizers. the most important form of sulfur for fertilizer is the mineral calcium sulfate. elemental sulfur is hydrophobic (not soluble in water) and cannot be used directly by plants. over time soil bacteria can convert it to
sulphide gold ore treatment by leaching and flotation process. sulphides require very fine grinding for maximum extraction then are returned to circuit. should be considered not only when building a new plant based on results of a thorough ore test but also in an existing plant when: ore changes in character.
most of the copper ores mined today are oxide or sulfide ores. extraction of sulfide ores is covered in more detail in copper mining and extraction: sulfide ores (11–14) but is introduced here because an important by-product of this process is used for the extraction of oxide ores. pyroprocessing sulfide ores provides acid for leaching
after this stage the enriched ore now contains about 25% copper by mass and is called copper concentrate. it is valuable enough to ship to other plants and other countries for processing. for example china germany and japan are major copper producers that use concentrate from around the world.
to clean coal start-up greatpoint makes gas. reviving 1970s-era technology an ambitious company says it can turn dirty coal into cleaner natural gas.