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# why is sulphide ore roasted before reduction -

##### Why is it advantageous to roast a sulphide ore to the ...

Why is it advantageous to roast a sulphide ore to the oxide before reduction? Sulphide ore is roast to the oxide before reduction because metal oxides can be reduced to metal by carbon and hydrogen much more easily than sulphides.

##### give reason why roasting is carried out on sulphide ores ...

2018-3-17 · So before reduction can be done, the ore is converted into metal oxide. The concentrated ores can be converted into metal oxide by calcination or roasting. Calcination : It is the process in which a carbonate ore is heated strongly in the absence of air toconvert it into a metal oxide.

##### A sulphide ore is generally roasted to oxide before ...

A sulphide ore is generally roasted to oxide before reduction, because we (a) the enthalpy of formation of CO2 is more than that of CS2 (b) a metal sulphide is generally more stable than the metal oxide (c) a sulphide ore cannot be reduced at all (d) no reducing agent is

##### ROASTING OF SULFIDE MINERALS - Wiley Online Library

2017-8-22 · 10. Other reduction or oxidation reactions such as 3M 3O 4ðÞs +MS sðÞ=10MO sðÞ+SO 2ðÞg ð2:18Þ Ms,lðÞ+SO 2ðÞg =MS sðÞ+O 2ðÞg ð2:19Þ Where more than one metal sulfide is present in the concentrate, the reactions are trulycomplex and

##### why are carbonate ores are calcined while sulphide ores ...

2019-3-20 · Roasting: It is the process in which a sulphide ore is strongly heated in the presence of air to convert it into a metal oxide. This is done in case of sulphide ores so as to remove sulphur in the form of SO 2 and to obtained corresponding metal oxide.

##### Calcination and Roasting: An Overview and Explanation

2021-10-31 · Ques: Why do the sulfide ores ensure the roasting process, and carbonate ore is calcined? (2 marks) Ans: In the roasting process, sulfide ore heats in the air and converts to metal oxide. But, in the case of carbonate ore, the moisture and carbonate are eliminated through the calcination process. Hence, roasting is inapplicable for carbonate ores.

2018-12-24 · Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true? (a) The Δ G f ° of the sulphide is greater than those lbr CS 2 and H 2 S. (b) The Δ G f ° is negative for roasting of sulphide ore to oxide. (c) Roasting of the sulphide to the oxide is themodynamically feasible.

##### give reason why roasting is carried out on sulphide ores ...

2018-3-17 · So before reduction can be done, the ore is converted into metal oxide. The concentrated ores can be converted into metal oxide by calcination or roasting. Calcination : It is the process in which a carbonate ore is heated strongly in the absence of air toconvert it into a metal oxide.

##### Smelting and Roasting Ores to recover gold, silver and ...

2014-6-26 · The process works best when the ore is crushed to small pieces before roasting. Additives, such as common rock salt are often added to the mix before it is heated to enhance the reaction of the sulfides. Once the ores are fully roasted, and the sulfur is driven off, the extraction of the gold or silver from the ore is not especially difficult.

##### ROASTING OF SULFIDE MINERALS - Wiley Online Library

2017-8-22 · 10. Other reduction or oxidation reactions such as 3M 3O 4ðÞs +MS sðÞ=10MO sðÞ+SO 2ðÞg ð2:18Þ Ms,lðÞ+SO 2ðÞg =MS sðÞ+O 2ðÞg ð2:19Þ Where more than one metal sulfide is present in the concentrate, the reactions are trulycomplex and

##### Calcination and Roasting: An Overview and Explanation

2021-10-31 · Ques: Why do the sulfide ores ensure the roasting process, and carbonate ore is calcined? (2 marks) Ans: In the roasting process, sulfide ore heats in the air and converts to metal oxide. But, in the case of carbonate ore, the moisture and carbonate are eliminated through the calcination process. Hence, roasting is inapplicable for carbonate ores.

##### why are carbonate ores are calcined while sulphide ores ...

2019-3-20 · Roasting: It is the process in which a sulphide ore is strongly heated in the presence of air to convert it into a metal oxide. This is done in case of sulphide ores so as to remove sulphur in the form of SO 2 and to obtained corresponding metal oxide.

##### why are metals sulphide and carbonate converted into

2012-10-7 · A sulphide ore is converted into oxide ore by roasting. 1. Calcination process It is the process of heating the concentrated ore at a temperature not sufficient to melt the ore. The water content and the volatile impurities also get expelled. Zinc carbonate in its ore calamine (ZnCO 3) is calcinated to obtain zinc oxide (ZnO).

##### Which of the following statements, about ... - Physical ...

Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true ? Question Type: Single Correct Type 1 Roasting of the sulphide to the oxide is thermodynamically feasible 2 Carbon and hydrogen are suitable reducing agents for all metal oxide 3 The AfGº of the sulphide is greater than oxide 4 The AfGº is negative for roasting of sulphide ore to ...

##### Sulfide Ores - an overview | ScienceDirect Topics

VMS ore-forming fluids are acidic, reduced, 1–3 M chloride solutions in which metals were transported mainly as chloride complexes (Table 3).Before the discovery of black smokers, temperatures of the ore fluids were estimated from rare fluid inclusion data and sulfur isotope fractionation between sulfide mineral pairs. pH values about 1 unit less than neutral (~5 at 250 °C) were determined ...