mining pyrite surface

Water | Free Full-Text | Heavy Metal Distribution

Acid mine drainage (AMD) is a major anthropogenic source of heavy metal discharge worldwide. However, little research has been carried out on the development of AMD in abandoned pyrite mines and the heavy metal contamination of mine surface water. The aim of this study was to investigate and assess heavy metal pollution in three …

Chalcopyrite vs. Pyrite

Chalcopyrite scores between 3.5 and 4 on the Mohs scale, which measures how hard something is. This means it's not too hard. To give you an idea of how hard chalcopyrite is, a typical steel nail, which has a hardness of about 4.5, can easily scratch it. Pyrite is hard, with a 6 to 6.5 on the Mohs scale.

Hydrogeochemistry of groundwater surrounding a pyrite mine …

The Yunfu pyrite mine is located in northwestern Yunfu (22°57́–22°59́N, 112°0́-112°1́E), Guangdong Province, China. It is one of China's rare giant pyrite megadeposits, ... The surface water samples obtained from the Datai reservoir were of the Ca-SO 4 type, with the pH ranging from 2.89 to 3.25 and an average TDS concentration …

The role of surface attachment of Thiobacillus ferrooxidans …

Growth of Thiobacillus ferrooxidans on pyrite mineral surfaces and in 9K leach media was studied through estimation of bacterial protein in the different phases. Bacterial attachment was found to be governed by particle size of the mineral, period of incubation and by stationary or agitation conditions used during incubation. Increased …

Molecules | Free Full-Text | Research on the Effect of Carbon …

To investigate the effect of carbon defects on the hydrophilicity of the whole surface of the coal pyrite, the adsorption of the single H2O molecule at different sites of the coal pyrite surface was studied with the DFT calculation. It was found that, like the ideal pyrite, the single H2O molecule can stably adsorb at the doping-position, the …

Surface chemistry of oxidised pyrite during grinding: EDTA extraction

The decrease in surface hydrophobicity of pyrite particles during grinding is mainly due to two factors: (1) oxidation of pyrite surfaces by dissolved oxygen or Fe 3+ ions and (2) precipitation and adsorption of iron hydroxides/oxyhydroxides onto pyrite surfaces derived from grinding media as a result of galvanic interactions. It is generally ...

Phosphate coating on pyrite to prevent acid mine drainage

H 2 O 2 oxidizes a small part of pyrite producing ferric iron (Fe 3+) anions. These cations subsequently react with the PO 4 3− anions to produce FePO 4 that precipitates on the pyrite surface producing a passive coating. This iron phosphate coating can protect the grains of pyrite from oxidation.

Evaluation of Functionalized Chitosan Polymers for Pyrite

In this work, polyacrylamide functionalized chitosan polymers (CS-PAMs) of different structural properties were synthesized and investigated as selective depressants of pyrite (FeS 2) in the flotation process of galena (PbS) and chalcopyrite (CuFeS 2) from a complex sulfide ore.Response surface methodology (RSM) with a Box-Behnken design …

Strategies for Reduced Acid and Metalliferous Drainage by Pyrite …

Following the initial lime-saturated water treatment, minimal additional alkalinity (calcite-saturated water) was required to maintain circum-neutral pH for the maintenance of pyrite surface ...

Landscape to atomic scales: Researchers apply new …

Pyrite, or fool's gold, is a common mineral that reacts quickly with oxygen when exposed to water or air, such as during mining operations, and can lead to acid …

From Mine to Masterpiece: Unveiling the Journey of …

Depending on the location and scale, mining methods may include open-pit mining or underground mining. Open-pit mining involves removing the overburden and extracting pyrite from the exposed ore body. Underground mining, on the other hand, …

Reduction of acid mine drainage by passivation of …

Passivation of pyrite surfaces is an effective way to reduce AMD at its source. •. The anti-corrosion technology of pyrite surface oxidation is discussed in …

Microbial communities in acid mine drainage and their

Thermoplasma and Ferroplasma lineages were abundant. From SEM and FISH, a number of A. ferrooxidans, a few cells of Archaea and Acidiphilium were detected adsorbed on the pyrite specimen surface. Leptospirillum sp. (hybridize with the probe LF655) has not been detected to be present on the pyrite specimen surface.

Where And How To Easily Find Pyrite – A Complete Guide

In the case of drusy pyrite, the result is a surface that shimmers and sparkles with the reflective qualities of countless small pyrite crystals. ... One fascinating aspect of the pyrite found at the Eagle Mine is its striking brassy-yellow color and well-formed cubic or pyritohedral crystals. Some specimens may exhibit intricate intergrowths ...

Correlation Between the Mineralogical Properties …

Mining, Metallurgy & Exploration. Article. Correlation Between the Mineralogical Properties and Oxidation Rate of Different Minerogenetic Pyrites: a …

Potential effects of exploiting the Yunfu pyrite mine

Trace element contamination caused by mining is a serious environmental problem. The potential effects of exploiting the Yunfu pyrite mine (southern China) on soil were investigated by determining trace elements in 56 surface soil samples from the vicinity of the Yunfu pyrite mine. The samples were acid dissolved and measured by an …

Microbial Communities in Acid Mine Drainage and Their

The detection of elements C, O, and P seemed to indicate microbes extensively adsorbed on pyrite specimen surface in this study. Morphology of Microbes Adsorbed on Pyrite Surface Observed by SEM. The results of microbes from K2 sample adsorbed on pyrite specimen surface, after 0, 16, 22, and 42 days, are shown in Fig. 3.

Correlation Between the Mineralogical Properties and …

Pyrite is the most widely distributed sulfide mineral on Earth and is the main product of a variety of hydrothermal gold mineralization systems, such as porphyry copper, orogenic gold, iron oxide–copper–gold, epithermal, and carlin-type gold deposits [].The crystal form and other characteristics of pyrite may vary with the type of deposit, and the …

Recycling of pyrite and gypsum mining residues through …

The thermal dissociation of pyrite tailings was investigated using TGA-DTA-QMS under an inert atmosphere up to 1000 °C with a heating rate of 5 °C/min. Fig. 2 (a) exhibits the TGA-DTA-QMS data, it was observed from the TGA curve that the mass is slightly increased by 1 wt.% up to 400 °C and this may be attributed to the partial …

Froth Flotation of Chalcopyrite/Pyrite Ore: A Critical Review

Cyanide is used in many mining plants, but its use has been questioned due to safety and environmental issues. This is because the xanthate and cyanide ions compete for the surface of pyrite, as occurs with the hydroxyl ion. The pyrite surface is covered by the Fe(CN) 6 4− ion according to the following reaction (Equation (20)) . In …

Mine Drainage | U.S. Geological Survey

Mine drainage is surface water or groundwater that drains from an active or abandoned mine. In some cases, pyrite (an iron sulfide mineral) is exposed and reacts with air and water to form sulfuric acid and dissolved iron. Some or all of this iron can precipitate to form the red, orange, or yellow sediments in the bottom of streams containing ...

Pyrite Oxidation Drives Exceptionally High …

Since 1970, coal production has been dominated by surface mining operations. In addition to exposing acid-generating FeS 2 to oxygen, surface mining also mechanically fragments large volumes of …

Prediction of acid mine drainage: Where we are

The mining and ore processing of sulfide-bearing deposits generates large volumes of waste rock (WR) and tailings, which often contain barren and residual iron sulfides (e.g., pyrite and pyrrhotite). Sulfide oxidation under atmospheric conditions can generate acidic leachates loaded with high concentrations of dissolved metal( oid )s …

Silicic protective surface films for pyrite oxidation

the oxidation of pyrite-bearing tailings and reduce the production of AMD through chemical leaching tests. Fourier transform infrared (FTIR) analyses and scanning electron microscopy with energy-dispersive spectrometry (SEM/EDS) confirmed the presence of silicic protective surface films of calcium silicate on the surface of pyrite-bearing tailings.

Interactions of Oxygen and Water Molecules with …

Pyrite is the most common sulfide in nature, and it is well-known for its roles in acid mine drainage, flotation separation of useful metal (Cu, Pb, Zn, and Mo) sulfide …

Pyrite Oxidation Mechanism by Oxygen in Aqueous …

The mechanism of the initial steps of pyrite (100) surface oxidation was investigated in detail by means of density functional theory/plane-wave calculations. Pyrite oxidation is related to many environmental and …

Minerals | Free Full-Text | Natural Pyrite as a Catalyst for a …

The efficient treatment of mineral-processing wastewater has attracted soaring interest recently. This study's objective was to degrade xanthate from flotation tailings wastewater using a pyrite-catalyzed Fenton system. A sodium butyl xanthate (SBX) removal rate of more than 96% was achieved via the method under optimal conditions (a …

Impact of acid mine drainage on groundwater

Combining environmental isotope analysis with principal component analysis can be an effective method to discriminate the inflows and sources of contamination in mining-affected watersheds. This paper presents a field-scale study conducted at an acid mine drainage (AMD)-contaminated site adjacent to a pyrite mine in South China. …

Source control on the acid mine drainage produced by the …

1. Introduction. Acid mine drainage (AMD), primarily generated through natural oxidation, rainwater leaching, and oxidizing microbial action on metal sulfide minerals (mainly pyrite) in waste rocks and tailings, is the main source of heavy metal pollution in mining areas and their surrounding environments (Ighalo, 2022).A report …

Significant Guidance Documents | Office of Surface Mining …

Section I.4 of OMB Bulletin 07-02 defines the term "significant guidance document" as a guidance document disseminated to regulated entities or the general public that may reasonably be anticipated to: Raise novel legal or policy issues arising out of legal mandates, the President's priorities, or the principles set forth in Executive Order ...