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When an acidic flux is used ?...

When an acidic flux is used ?

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When the ore contains some basic impurities such as lime, FeO, etc. the flux used is some acidic substance such as silica, borax, etc. For example,
`underset(" Flux (Acidic)")(SiO_2) + underset("Gangue (Basic)")(CaO ) to underset("slag")(CaSiO_3)`
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ICSE-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS -EXERCISE (PART-II ( DESCRIPTIVE QUESTIONS )) (VERY SHORT ANSWER QUESTIONS)
  1. What is slag?

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  2. Give one main difference between calcination and roasting?

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  3. When an acidic flux is used ?

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  4. When a basic flux is used ?

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  5. What is leaching?

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  6. Alumina is concentrated by dissolving in concentrated solution of NaOH...

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  7. What is the role of collectors in froth floatation process? Name two...

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  8. Why sulfide ores are usually concentrated by froth floatation process ...

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  9. What is Ellingham diagram?

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  10. In terms of Ellingham diagram state why Al2O3 cannot be reduced by chr...

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  11. Which reducing agent is used to reduce the oxides of less electroposit...

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  12. Which kind of ores undergo self reduction ?

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  13. What are refractory materials?

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  14. Why is MgO used for lining the inner surface of the furnace?

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  15. Indicate the temperature at which carbon can be used as a reducing age...

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  16. How would you purify a metal like Copper?

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  17. Name the purification method which involves vapour phase extraction.

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  18. Ultra pure silicon is needed by electronic industry. By which method o...

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  19. Name the three main varieties of iron. Which out of them is the purest...

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  20. What is the percentage of carbon in steel?

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