iron ore sulphides

Mineral transformations and textural evolution during

The processes occurring during roasting of bog iron ores were characterized using TG–DTG–DTA–QMS, XRD, FTIR and specific surface analysis. Removal of physically adsorbed water is followed by dehydroxylation of iron oxyhydroxides and oxidation of organic matter at 200–600 °C. The main product of the transformations is disordered …

12. Supergene Ore and Gangue Characteristics

In the traditional view, supergene ore and gangue minerals are the products of reactions between hypogene sulfide minerals and descending, acidic meteoric waters; these processes take place at or near the ground surface in subaerial environments (Guilbert and Park, 1986). In VMS deposits, copper and other metals are mobilized from primary massive

Mineral

Mineral - Sulfides, Crystals, Properties: This important class includes most of the ore minerals. The similar but rarer sulfarsenides are grouped here as well. Sulfide minerals consist of one or more metals combined with sulfur; sulfarsenides contain arsenic replacing some of the sulfur. Sulfides are generally opaque and exhibit distinguishing colours and …

The Electrical Resistivity of some Sulphide and Oxide …

This bottom shale host rock was interpreted as containing concentrations of sulphides due to resistivities near 0.07 Ω m and to anomalies in terms of iron (FE) and sulphur (S) content.

Sulfide Mineral

Sulfide Mineral. The sulphide minerals are the major source of world supplies of a very wide range of metals and are the most important group of ore minerals. From: …

Investigation of Adsorption Mechanism of Reagents

The Iron oxides are the most abundantly occurring deposits compared to the sulphides and carbonates. 2.1.1. Mineralogy of iron ore. ... Results of iron ore flotation imply that a certain amount of the flotation collector do adsorb on iron ore, especially at high concentrations of calcium ions in the process water and high dosages of collector. ...

The Superficial Alteration of Ore Deposits

THE SUPERFICIAL ALTERATION OF ORE DEPOSITS.' GENERAL FEATURES. Scope of the subject.-The modern idea of ore deposits teaches that formations of this kind represent a process of concentration of mineral matter, either by chemical or physical means; in other ... Thus, iron sulphides and copper sulphides are both oxidized.

Determining Iron Grades of Ores or Concentrates …

249 Accesses. 2 Citations. Metrics. Abstract. Titration is often used to determine the iron grade in sulfide ores. In this method, HCl is used as the main …

Sulphidisation of oxides and oxidised sulphides and

The figure shows that among the sulphides, chalcocite (Cu 2 S) flotation starts at the lowest redox potential and pyrite flotation starts at the highest redox potential while the onset flotation of the copper‑iron sulphides, bornite (Cu 5 FeS 4) and chalcopyrite (CuFeS 2), fall in between. These differences are related to the electrochemical ...

Lime use and functionality in sulphide mineral flotation: A …

Metal sulphides are expected to have negative surface charge in alkaline conditions, having generally an isoelectric point pH IEP < 3.5 (Bebie et al., 1998). In a flotation pulp, the sulphides pH IEP can shift to much higher values due to oxidation and/or the adsorption of positive metal ions (e.g., Cu 2+) from solution (Multani et al., 2018).

Sulfide mineral | Definition, Examples, Identification, …

The metals that occur most commonly in sulfides are iron, copper, nickel, lead, cobalt, silver, and zinc, though about fifteen others enter sulfide structures. Britannica Quiz. …

(PDF) IRON DYNAMICS IN ACID MINE DRAINAGE

Abstract. The oxidation of iron sulfides in mine wastes is the main cause of acidic, sulfate, and trace element-rich acid mine drainage (AMD). However, the suite of reactions that transform iron ...

FLOTATION OF PYRRHOTITE FROM MAGNETITE ORES

Gol-e-Gohar iron complex, one the largest iron concentrate producer, is located in the Kerman Province in Iran. The ore suffers from elevated S and P content equal to 0.5% S and 0.08% P ...

Sulfide Flotation

Electronic properties of sulfide minerals and floatability. Jianhua Chen, ... Ye Chen, in Electronic Structure and Surfaces of Sulfide Minerals, 2020. 2.6.1 Introduction. Sulfide ore flotation is a complex electrochemical system. Electron transfer not only occurs between the sulfide minerals and flotation reagent molecules, but it also happens among different …

Determining Iron Grades of Ores or Concentrates …

Iron ores used in the steel industry must have some certain chemical properties including the amount of Fe(II), Fe(III), and the total Fe. In some geological studies, having an accurate level of Fe(II) and Fe(III) is essential for determining the petrology and mineralogy of an ore.[] Iron is found naturally in hybrid forms such as …

The iron sulphide minerals: their

The iron sulphide minerals: their chemistry and role in nature D. J. Vaughan and A. R. Lennie Metal sulphides are a major group of ore minerals, and the iron sulphides are the most widely occurring of the sulphide minerals y found not only in sulphide ore deposits but also as accessory minerals in many common rocks. The structures and phase rela-

9.2.2: Sulfides and Sulfosalts

Pyrite (iron sulfide) is most common. Other relatively common sulfides include chalcopyrite (copper iron sulfide), molybdenite (molybdenum sulfide), sphalerite …

Sulfide Minerals

When iron sulfide minerals are exposed to the atmosphere and water, the water becomes acid and enriched in iron that eventually leaves yellow and reddish deposits in its wake. …

Image Analysis of Iron Oxides under the Optical …

discriminating between some major sulphides or sulphides and gangue (Lastra, 1998). It is sensitive to the mean atomic number of a mineral. If an 8 bit ... important topic in iron ore characterization. Here again, due to the limited depth of focus of optical microscopy, excellent contrast is achieved between ...

Acid mine drainage from sulphide ore deposits

Large amounts of pyrite and other sulphides remain in the highly fractured ore-bodies, and in poorly situated tailings and waste piles. ... and release of large volumes of acid mine drainage. pH values as low as 0.6 have been measured in drainage from the Iron Mountain Mine, which is on the U.S. National Priority (Superfund) List. In addition ...

(PDF) Holistic management of sulphides at Rio Tinto Iron Ore…

Holistic management of sulphides at Rio Tinto Iron Ore's Pilbara mine sites September 2009 Transactions of the Institution of Mining and Metallurgy, Section A: Mining Technology 118(3-4):232-237

Research on Beneficiation and Reprocessing of Gold Tailings

DRD Gold extracted 33,600 ounces of gold, worth nearly US$40 million, in the last quarter of 2013. Mintails, a mine tailings processor, has developed new technology to process 350,000 tons of ...

Iron ore mining and dressing

Iron ore extraction. Iron does not occur in nature as a pure substance but as a compound in rocks, which can contain up to 50 % iron. These ferrous rocks are also called iron ores. The iron compounds contained therein are mainly iron oxides, but also iron carbonates or iron sulphides. The most important iron oxides include: magnetite: …

Minerals | Free Full-Text | Ore Minerals and Metal …

In terms of mineral composition, deposits in the tailing pond reflect the ores occurring in the deposit—they are largely composed of the same ore components (copper sulphides, copper and iron …

Critical importance of pH and collector type on the flotation …

Aero 3418 A has a good selectivity against iron sulphide and Aero 3477 is strong and selective for the activated zinc minerals and exhibits selectivity against the iron sulphides 17. Therefore ...

Arsenic Removal from Arsenopyrite-Bearing Iron Ore and …

In most cases, arsenic is an unfavorable element in metallurgical processes. The mechanism of arsenic removal was investigated through roasting experiments performed on arsenopyrite-bearing iron ore. Thermodynamic calculation of arsenic recovery was carried out by FactSage 7.0 software (Thermfact/CRCT, Montreal, Canada; GTT …

2.3: Mineral Groups

Exercise 2.2 Mineral groups; Most minerals are made up of a cation (a positively charged ion) or several cations, plus an anion (a negatively charged ion (e.g., S 2−)) or an anion complex (e.g., SO 4 2−). For example, in the mineral hematite (Fe 2 O 3), the cation is Fe 3+ (iron) and the anion is O 2− (oxygen). The two Fe 3+ ions have an overall charge of +6 …

List Sulphide Minerals

Color, bronze-yellow, sometimes inclined to copper-red, occasionally nearly gray; powder, grayish black; luster, metallic; H = 3.5 to 4.5; G = 4.58 to 4.64; magnetic; composition, iron and sulphur in variable proportions—iron 59% to 62%, and sulphur 41% to 38%. By reason of the lower … See more

Reduction of Oxides and Reduction Smelting | SpringerLink

In the Wiberg–Soderfors process [], sponge iron is produced in a shaft kiln at 1100 °C by passing water gas (H 2 + CO) over iron ore or concentrate.As there is no liquid slag formation at this temperature, the impurities are not separated. The resultant solid product containing the gangue oxides named "sponge iron" is subsequently melted in an …

Agglomeration and Characterization of Nickel …

The standardization applied to iron ore was followed. The best result of crushing strength was 98.52 daN/pellet. ... (2019), about 60% of ore reserves are found in laterite ores and 40% in sulphides . Historically production was mainly executed by sulphide processing; however, an increasing production based on laterites is expected . Thus ...