It is easier to do extraction of metals or obtain metal from its oxide, as compared to its sulfides and carbonates. Therefore, prior to reduction, the metal sulfides and carbonates must be converted into metal oxides. The sulfide ores are converted into oxides by heating strongly in the presence of excess air. This process is known as roasting.
For example, the chemical composition of the quartz sand ore in the Suling Malingshan Mine in is SiO2 79. 38%, Fe2O3 1. 68%, AL2O3 11.28%, and its particle size composition is 0.1 mm 65%. After the pre processing operation, the grade of SiO2 is increased to 86.36%, the Fe2O 3 is reduced to 0.49%, and the AL2O 3 is reduced to 6.79%.
Extraction of Rough Gemstones from the Ores The process of extracting the gemstones from the ores varies from place to place and is dependent on the nature and quality of the gemstone. In general those from alluvial deposits are assorted by washing with sieves. Slurry containing the gemstone rough along with mud and other materials
The manufacturing process involves a mixture of quartz aggregated chips pigments, additives, and resin binders. Engineered quartz stone for slab and countertop applications come in a wide array of colors, textures, and patterns. Depending on the manufacturing process, the texture can be either coarse or fine.
The primary methods used to extract minerals from the ground are: Underground miningSurface miningPlacer mining The location and shape of the deposit, strength of the rock, ore grade, mining costs, and current market price of the commodity are some of the determining factors for selecting which mining method to use.
In the quartz sand extraction process, because there are fewer impurities in the raw ore, the main beneficiation process is to purify and remove a small amount of impurities in quartz sand. Currently, the processes used include: classification and desliming, scrubbing, magnetic separation, flotation, acid leaching and so on.