CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
320996
Which one of the following statements is false?
1 During roasting, moisture is removed from the ore.
2 The ore is freed from almost all nonmetallic impurities.
3 Calcination of ore is carried out in the absence of any blast of air.
4 The concentrated zinc blende is subjected to calcination during its extraction by pyrometallurgy.
Explanation:
The concentrated zinc blende (sulphide ore) is subjected to roasting not to calcination because calcination process is used for carbonate ores whereas roasting is used for sulphide ores.
KCET - 2011
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
320997
The process of converting limonite into haematite is called:
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
320996
Which one of the following statements is false?
1 During roasting, moisture is removed from the ore.
2 The ore is freed from almost all nonmetallic impurities.
3 Calcination of ore is carried out in the absence of any blast of air.
4 The concentrated zinc blende is subjected to calcination during its extraction by pyrometallurgy.
Explanation:
The concentrated zinc blende (sulphide ore) is subjected to roasting not to calcination because calcination process is used for carbonate ores whereas roasting is used for sulphide ores.
KCET - 2011
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
320997
The process of converting limonite into haematite is called: