Large amount of copper are obtained from copper pyrite (CuFeS2) by smelting. Ores containing 4% or more copper are treated by smelting process. Very poor ores are treated by hydrometallurgical process. For latest information, free computer courses and high impact notes visit :
The ore yields about 46% of iron, and contains about % of sulphur, the roasting of the ores being necessaryoreroasting kilns are more extensively used here than in any other place in the country.
Roasting Furnaces furnace, ore, hearth, limit, . FURNACES, ROASTING. Roastingfiirnaces are either oxidizing or chloridizing, according as the purpose for which they are used is to convert the metals in the ores ...
Roasting: In roasting, we: change some of the CuFeS 2 to copper oxide remove some of the sulphur as sulphur dioxide. We do this by heating the concentrated ore from froth floatation. It is heated to betweem 500 °C and 700 °C in air. The product from the roaster is called calcine. It is a solid mixture of oxides, sulphides and sulphates.
The froth is skimmed off the surface and the enriched ore (mainly the copper mineral) is taken away for roasting. The mixture of water, ing agent and paraffin is recycled. After this stage the enriched ore now contains about 25% copper by mass and is called copper concentrate.
By roasting ores in which gold and silver is present with salt, chlo ride of gold is formed, according to Plattner ; but 66 ROASTING OF ORES. before the ore becomes red hot, the gold loses a part of its .
Partial roasting is a method to clean the concentrate from arsenic and thereby produce a suitable raw material for the copper smelter. Also mercury is commonly found in copper bearing minerals. In partial roasting process the both the arsenic and mercury are volatilized, while a part of the sulphur is used as energy during the roasting.
Copper metal can be prepared by roasting copper ore, which can contain cuprite (Cu2S) and Copper (II) sulfide. Cu2S + O2 > 2Cu + So2 CuS + O2 > Cu + SO2 Suppose an ore sample contains % ...
CALCINATION ~ it is the process in which carbonate ore is heated strongly in the absence of air to convert it into metal oxide.. ROASTING ~ it is the process in which sulphide ore is strongly heated in the presence of air to convert it into metal oxide .
roasting of copper and nickel ore and ore concentrates: As a leading global manufacturer of crushing, grinding and mining equipments, we offer advanced, reasonable ... Know More what is the procedure in making copper ore into concentrate
Jan 14, 2017· Roasting is the process of converting an ore into its oxide by heating strongly in the presence of an excess of air (oxygen), so that oxygen reacts to forming the corresponding oxide. It is done for sulphide ores in order to remove sulphur as sulp...
The roasting of copper ores (Chalcopyrite CuFeS 2) belongs to the first roasting applications of sulfidic concentrates. There are three different processes to roast ... Continuous Ore Roaster Setup .
Around 1700 AD, reverberatory furnaces were constructed in which the ore was processed by roasting reaction, the socalled English or Welsh copper smelting process, originally with ten process steps. The large blast and reverberatory furnaces of the 20th century were derived from these principles.
Sep 06, 2007· Copper metal can be prepared by "roasting" copper ore, which usually consists of a mixture of cuprite, Cu2S, and copper(II) sulfide. Cu2S(s) + O2(g) 2 Cu(s) + SO2(g) CuS(s) + O2(g) Cu(s) + SO2(g) Suppose a sample of copper ore contains % (by mass) impurities in addition to a mixture of Cu2S and CuS. Heating g of the impure ore produces g of copper metal with a purity of .
Heating with Carbon monoxide: Used for extracting iron from iron ore using the blast furnace. Roasting in Air: Used in extractingcopper from copper (I) sulphide (copper pyrites). The copper is extracted by roasting the ore in air. Recycling metals Metals are nonrenewable resources. This means once dug up it cannot be replaced.
Thus, it is a refractory gold ore, due to the effect of the latter, so roasting is a good approach for increasing its recovery. Table 5 shows the mineral composition for the microwave roasted sample. It can be seen that all the pyrite, and most of the lesser compounds, are gone, generating hematite and some noncrystalline phases, instead.
With the roasting condition fixed at a roasting temperature of 450 °C, an O 2 proportion of 10%, a particle size of ore of ∼75 μm and a roasting time of 2 h, the effect of the dosage of NH 4 Cl on the extractions of metals is shown in Fig. 10.
A method for roasting sulphide ores or ore concentrates containing precious metals is practiced in a furnace, typically in a fluidized bed. The ore and a sulphurbinding limecontaining material are supplied to a roasting furnace in which the ore is roasted with the emission of heat and sulphur dioxide. The limecontaining materialsuch as calcium hydroxideis mixed into the cooling water ...
"Around 30% of world copper concentrates output contains more than % or 1,000 ppm As. complex copper concentrates have an As content greater than % (2,000 ppm) with no upper limit, although China imposes a limit of % As (5,000 ppm) on imported base metal concentrates.
Abstract—The roasting of copper ores belongs to the first roasting applications of sulfidic concentrates. Sulfatizing roasting has been used on an industrial scale for many decades. It is part of a wellproven extraction method that is particularly suitable for the copper and cobalt ores from the copper belt.
Roasting is performed in copper smelters prior to charging reverberatory furnaces. In roasting, charge material of copper concentrate mixed with a siliceous flux (often a lowgrade copper ore) is heated in air to about 650°C (1200°F), eliminating 20 to 50 percent of the sulfur as sulfur dioxide (SO2).