The sulfur-bearing minerals which predominate in coal seams are the iron sulfide ores pyrite, marcasite, amorphous 'sulfur-balls', and less commonly the monosulfide pyrrhotite. Excluding pyrrhotite, all have the same ratio of sulfur to iron but have different crystalline properties. The amorphous structure is reported to be the most reactive due to its large surface area, followed by pyrrhotite...

Arsenic is present in all copper, lead, and zinc sulfide ores and is carried along with those metals in the mining, milling and concentrating process. Separation, final concentration and refining of by-product arsenic as the trioxide is achieved at smelters. Arsenic is the essential consistent element of many compounds important and widely used in agriculture and wood preservation. Lesser amoun...

Particle size, pH and Fe(III) ions affect the process of bioleaching of copper from chalcopyrite ores. In the study presented herein a copper sulfide ore was subjected to bioleaching process using a mixed microbial consortium obtained from a biotrickling filter treating high loads of H2S at different mineral particle size, distinct medium pH and various additional Fe(III) ion concentrations as ...

One of the main sources non-ferrous and precious metals is sulfide ores. This paper presents a review existing literature on electrochemical properties some most common industrial sulfides, such as pentlandite, chalcopyrite, sphalerite, galena, pyrrhotite, pyrite, etc. The study results surface redox transformations minerals, galvanic effect, cathodic oxygen reduction reaction sulfides are pres...

Many studies have shown that the average iron (Fe) isotope compositions of mantle-derived rocks, mantle peridotite and model are close to those chondrites. Therefore, it is considered chondrite values represent bulk Earth Fe composition. However, this a brave assumption because nearly 90% in core, where its composition unknown, but required construct We approach problem by assuming Earth’s core...

With the vigorously growing demand of steel industry, corrosion resistance alloys, clean energy industries, and a variety engineered infrastructure or technology, high-grade nickel ores are being exhausted gradually in world. This review outlines metallurgical processes for production from various sulfide resources, particularly focusing on recent developments to identify potential trends techn...

The purpose of the present study is to evaluate mass fractions group noble metals (gold, silver, platinum, ruthenium, osmium, palladium, iridium, rhodium) in ores and host rocks Pioneer deposit (the Upper Amur Region, Russia) determine their migration activity hydrochemical classification ore by sizes. object primary oxidized ores, as well hosting this mineralization. employs method quantitativ...