-
Email us
-
Online Us
24-Hour Service
-
Find Us
HeNan, China
24-Hour Service
HeNan, China
Sulphating roasting is a unit operation in the production process for copper and cobalt from sulphidic ores. The simplified block diagram in Figure 1 shows that roasting is the first stage in the process flow sheet. The objective of roasting is a selective sulphation of copper and
T1 - Sulphating roasting, a new way to solubilize uranium in refractory minerals. AU - Asmund, G. AU - Lundgaard, T. AU - Srensen, Emil. PY - 1970. Y1 - 1970. M3 - Article in proceedings. T3 - IAEA-SM 135/10. BT - Proceedings. PB - International Atomic Energy Agency. T2 - Symposium on Recovery of Uranium from its Ores and other Sources
In sulphatising roasting, sulphide is converted into sulphate as sulphatecan be dissolved easily into an ically use sulphide ores. ting ed. The calculation procedure for calorific value of solid fuel and gaseous fuel is illustrated through an example. Type of roasting presented here is in brief.
Sulphatising Roasting of a Greenlandic Uranium ore. Reactivity of Minerals and Recovery by J. K. Gamborg Hansen Ris National Laboratory Chemistry Department Abstract Uranium in the lujavrite ore from Kvanefjeld, South Greenland, can be solubilised by sulphatising roasting at 700 C. The reactivity of various
roasting of copper sulphides has been considered a fairly attractive pretreatment technique for such resources, which has been exploited on a large scale 5 as well.
Jul 18, 2013 This was mainly attributed to an improved sulphatising environment during the roasting of mixed sulphides. The kinetics study of the CuSFeS system with a steam-oxygen mixture showed that the copper sulphate formation followed the topochemical model.
Jan 01, 1989 The lower temperature includes the conditions likely to prevail when a manganese nodule reacts with sulphur dioxide and the higher temperature indicates the condi- tions for recovering Mnz03 or Mn304 for MnS04 by roasting. Mellor (1961) has stated that (NH4)2SO4 decomposes to yield sulphuric oxides (eqs. 4
Oct 31, 2016 Roasting in Metallurgy. In metallurgy, the operation of roasting, as a preliminary to chlorination, has for its object the expulsion of the sulphur, arsenic, antimony and other volatile substances existing in the ore, and the oxidation of the metals left behind, so as to leave nothing (except metallic gold) which can combine with chlorine when ...
Mar 30, 2013 Sulphating roasting of copper-cobalt concentrates. Feed Concentrate A Roasting air 32 000C at 50C Nm3/h . PALPERI, M. and AALTONEN, O. Sulphatizing
Roasting of the ore tested also tends to reduce reagent costs and handling problems. Ores that may benefit from roasting include those of low uranium extractability that contain oxidizable organic materials or clay minerals. Roasting improves the porosity of ores by removing carbonaceous material and dehydrating clays, and it may even break ...
Sulphatising roasting of a Greenlandic uranium ore, reactivity of minerals and recovery . By J.K. Gamborg Hansen. Download PDF (3 MB) Topics Ris-R-355, Ris-355, Ris report 355 . Year ...
This was mainly attributed to an improved sulphatising environment during the roasting of mixed sulphides. The kinetics study of the CuSFeS system with a steamoxygen mixture showed that the ...
During the remelting of automobile scrap in the electric arc furnace steelmaking process, a dust is generated. This dust contains significant amounts of zinc, iron, and lead and in some cases, copper and nickel. However, the recovery of these metals is difficult, because of the complex chemical and physical characteristics of the dust. Numerous pyrometallurgical, hydrometallurgical and hybrid ...
Sulphatising Roast.Roasting of copper ores for sulphatisation has been suggested as a preliminary step in the hydro-metallurgical recovery of copper. It is known that if a mixture of iron and copper sulphides is roasted in air, it is the burning of iron sulphide which is responsible for the primary elimination of
Sulphatising roasting Leaching and solution purification Reduction and powder production Chemical department requested. There were also questions regarding physical exercise, smoking, alcohol consumption, cardiovascular and pulmonary diseases, and diabetes. There were 352 male workers who had been employed and exposed to cobalt for at
40a-2/50 Sulphatising roasting and sulphatising of ores by dry methods (12i 12m 12n) 40a-2/60 Chloridising roasting and chlorination (12i 12m 12n) 40a-2/80 Production of metallic compounds other than oxides, sulphates, chlorides as
In general, the optimum roasting technique, as far as temperature of roast and gas composition are concerned, is similar for all. The overall iron unit recovery was 90.63 pct. It should be remarked in passing that the magnetic roasting step, in addition to putting the ore into a form that can be readily and cheaply concentrated, usually makes ...
Feb 14, 2017 A chloridizing roasting process was used to remove copper and sulphur from copper slags in this study. Higher holding temperature and longer residence time were beneficial to the removal of copper and sulphur. Massive 2CaOSiO 2 was produced with O 2 velocity and CaCl 2
Roasting- It is the process in which concentrated ore is heated to high temperatures in presence of excess of air. It is used for conversion of concentrated ore into its oxide. This process is mainly used for sulphide ores to get the corresponding oxides, as the extraction of metal is easier from oxides.
The roasting and leaching behavior of spodumene in sulphuric acid process was investigated.Thermal analysis results of ore sample showed that the peak temperature of crystal conversion was 1006 .The temperature,the time and the size were investigated in the roasting process of crystal conversion.X-ray diffraction(XRD) analysis showed that most of -spodumene converted to -spodumene when ...
Jun 04, 2018 Roasting. It is a process wherein the ore is heated either alone or with some other material in excess of air below the fusion point of the ore. Usually, this method is used for sulphide ores. In roasting, definite chemical changes take place to form oxide or chloride of the metal. Ores of metals like zinc, lead, copper and nickel, when roasted ...
The range has been 0.021.0 mgCo/m 3 in the sulphatising roasting department, 0.010.05 mgCo/m 3 in the leaching and solution purification department, 0.050.25 mgCo/m 3 in the reduction and powder production department, and 0.010.20 mgCo/m 3 in the chemical department.
Sulphatising Roasting Of Nickel Concentrate Bosch Power Impactor Gds-18 Vibratingscreen Crusher Chinaballmill Trona Crush Calcite Manufacturing Machines Diamond Grinder Sanders Photos Of Ball Mills Crusher Of 1955 Made By Fredrick Parker Raymond Mill 5057in India Al Powder Ball Mill Petrocoke Drying And Grinding Plant Cone Crusher ...
The conventional pyrometallurgy-based processes for Se recovery are sulphatising roast (Hait et al., 2009), soda roast and oxidizing roast (Hyv arinen et al., 1989). The Se is converted into ...
This thesis investigates a process using sulphation roasting as an alternative method for processing enargite concentrates copper is recovered from the calcine by acid leaching, gold is extracted from the leach residue by conventional cyanidation and arsenic is either fixed in the calcine or precipitated from process emissions. ...
Jul 18, 2013 The water leach residue, consisting mostly of oxides, was moistened with H 2 SO 4 then baked (sulphatising roasted) in static conditions for 30 min at 973 K. The baked mass was found to contain CuSO 4 , CuSO 4 3H 2 O, CuSO 4 5H 2 O, Cu 2 O(SO 4 ) and Fe 2 O 3 .
sulphatising roasting department, 0.010.05 mgCo/m3 in the leaching and solution purification department, 0.05 0.25 mgCo/m3 in the reduction and powder production department, and 0.010.20 mgCo/m3 in the chemical depart-ment. The mean exposure levels to cobalt and its compounds were slightly over the current Finnish occupational exposure
EARLY in 1951, Falconbridge undertook a research program aimed at the development of a sulphate roasting process for the recovery of the non-ferrous rnetals from the nickeliferous pyrrhotite fraction of Falconbridge ore, in order to reduce the tonnage of iron entering the srnelter. Such a method, it
Metallurgy concentration, roasting, smelting. Roasting. It is a process wherein the ore is heated either alone or with some other material in excess of air below the fusion point of the ore. Usually, this method is used for sulphide ores. In roasting, definite chemical changes take place to form oxide or chloride of the metal.
Aug 04, 2016 UNIT-II (Learning objective Deals with different types of roasting processes) Roasting Types of roasting Oxidizing, sulphatising and chloridizing. Simple equations/reaction. Roasting furnace Multiple hearth roaster, flash roasting, fluidized bed roasting, blast roasting. Sintering and pelletisation
Jun 15, 2019 Roasting is a step of the processing of different ores, but before roasting the ore has already been partially purified from impurities by the process called froth floatation. Process of roasting consist of solid-gas thermal reaction which includes reduction, oxidation, sulfation, chlorination and pyro hydrolysis.
leaching, high temperature oxidising roast or sulphatising roast with sulphuric acid followed by either water or acid leaching. Selenium is removed by smelting with soda (Na2CC3) and nitre (NaNOs), roasting with soda or roasting with sulphuric acid. Generally, a combination of techniques is used depending on other impurities contained in the ...
roasting temperature of 1273 K, the roasting time of 90 min, the 15% dosage of calcium chloride, and the 5% dosage of calcium hypochlorite. 308 J. Xiao et al. / JMM 55 (3) B (2019) 305 - 314 Figure 4. SEM images after roasting at various segregation roasting temperatures Figure 5.
Nov 19, 2019 The range has been 0.021.0 mgCo/m 3 in the sulphatising roasting department, 0.010.05 mgCo/m 3 in the leaching and solution purification department, 0.050.25 mgCo/m 3 in the reduction and powder production department, and 0.010.20 mgCo/m 3 in
The incidence density in the sulphatising roasting department and leaching and solution purification department was 0.006 and 0.005, respectively, with median exposure levels to cobalt of 100 g/m (min to max 6-1000 g/m) and 30 g/m (min to max 10-100 g/m), respectively.
Related News