Magnesium treatment is carried out to produce ________ cast iron.

Magnesium treatment is carried out to produce ________ cast iron.

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Home/GATE MT EXTRACTIVE METALLURGY

Magnesium treatment is carried out to produce ________ cast iron.

Magnesium treatment is carried out to produce ________ cast iron.

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3.82%(A) Roasting ( 6 voters )

88.54%(B) Leaching ( 139 voters )

4.46%(C) Zone refining ( 7 voters )

3.18%(D) Smelting ( 5 voters )

Based On 157 Votes

A zinc electrowinning cell is being operated at a current of 400 A, voltage of 3.5V, and a cathodic current efficiency of 90%, the specific energy consumption (in kg KJ-1 zinc) is _____. (answer up to two decimal places) Given Atomic ...Read more

A zinc electrowinning cell is being operated at a current of 400 A, voltage of 3.5V, and a cathodic current efficiency of 90%, the specific energy consumption (in kg KJ^{-1} zinc) is _____. (answer up to two decimal places)

Given Atomic weight of zinc =65

Read lessThe sieve analysis of ground quartz particles is given in the table below:The cumulative mass fraction ...Read more

The sieve analysis of ground quartz particles is given in the table below:

The cumulative mass fraction of particles of size less than 1.68mm is ________. (answer up to two decimal places)

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5%A ( 2 voters )

2.5%B ( 1 voter )

72.5%C ( 29 voters )

20%D ( 8 voters )

Based On 40 Votes

What is the voltage required to electrolytically refine impure copper of activity 𝑎𝐶𝑢 = 0.9 (Raoultian standard state) to pure copper at 300 K?Given: Gas constant R = 8.314 J mol– 1 K– 1, and Faraday’s constant F = ...Read more

What is the voltage required to electrolytically refine impure copper of activity 𝑎_{𝐶𝑢} = 0.9 (Raoultian standard state) to pure copper at 300 K?

Given: Gas constant R = 8.314 J mol^{–} ^{1} K^{–} ^{1}, and Faraday’s constant F = 96500 C mol ^{-1}.

(A) 1.36 mV (B) 2.72 mV (C) 0 mV (D) 5.44 mV

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61.11%(A) make the surface of the mineral hydrophobic. ( 55 voters )

18.89%(B) make the surface of the mineral hydrophilic. ( 17 voters )

18.89%(C) stabilize the froth. ( 17 voters )

1.11%(D) adjust the pH. ( 1 voter )

Based On 90 Votes

100 Metric tons of copper concentrate containing 21 wt.% Cu is to be processed in 6 months with 25 working days per month and 8 working hours per day. The concentrate is leached by sulphuric acid and electrolyzed in 10 ...Read more

100 Metric tons of copper concentrate containing 21 wt.% Cu is to be processed in 6 months with 25 working days per month and 8 working hours per day. The concentrate is leached by sulphuric acid and electrolyzed in 10 cells arranged in series. The minimum current rating (**Ampere per month per cell**, rounded off to the nearest integer) is ______.**Given: **Faraday constant = 96500 𝐶𝑜𝑢𝑙𝑜𝑚𝑏 𝑝𝑒𝑟 𝑔𝑟𝑎𝑚 𝑒𝑞𝑢𝑖𝑣𝑎𝑙𝑒𝑛𝑡. Atomic weight of copper is 63.

92.75%Cr23C6 ( 64 voters )

4.35%Fe3C ( 3 voters )

2.9%SiC ( 2 voters )

0%Mn3C ( 0 voters )

Based On 69 Votes

0.94%Bauxite ( 1 voter )

1.89%Chalcopyrite ( 2 voters )

13.21%Cassiterite ( 14 voters )

83.96%Ilmenite ( 89 voters )

Based On 106 Votes

15.38%(A) P-4, Q-2, R-3, S-1 ( 2 voters )

84.62%(B) P-2, Q-4, R-3, S-1 ( 11 voters )

0%(C) P-3, Q-4, R-1, S-2 ( 0 voters )

0%(D) P-4, Q-1, R-2, S-3 ( 0 voters )

Based On 13 Votes

12.9%(A) FeS2 ( 4 voters )

0%(B) Fe2O3 ( 0 voters )

6.45%(C) Fe3O4 ( 2 voters )

80.65%(D) Fe1-xO ( 25 voters )

Based On 31 Votes

3.33%(A) P-3,Q-2,R-4,S-1 ( 1 voter )

86.67%(B) P-3,Q-4,R-2,S-1 ( 26 voters )

3.33%(C) P-2,Q-4,R-3,S-1 ( 1 voter )

6.67%(D) P-4,Q-1,R-3,S-2 ( 2 voters )

Based On 30 Votes

17.92%(A) Zn,Fe,Pt,Cu ( 19 voters )

14.15%(B) Pt,Zn,Cu,Fe ( 15 voters )

26.42%(C) Fe,Pt,Cu,Zn ( 28 voters )

41.51%(D) Pt,Cu,Fe,Zn ( 44 voters )

Based On 106 Votes

35%(A) Silica has a significantly lower thermal expansion coefficient than magnesia at higher temperatures. ( 7 voters )

40%(B) Silica has a significantly higher thermal conductivity than magnesia at higher temperatures. ( 8 voters )

5%(C) Silica has a significantly lower melting point than magnesia. ( 1 voter )

20%(D) Silica has a significantly more acidic than magnesia. ( 4 voters )

Based On 20 Votes

68.97%(A) Sphalerite ( 20 voters )

3.45%(B) Magnetite ( 1 voter )

3.45%(C) Chalcopyrite ( 1 voter )

24.14%(D) Galena ( 7 voters )

Based On 29 Votes

71.43%(A) Mineral P ascends with air bubbles preferentially over mineral Q. ( 10 voters )

28.57%(B) Mineral Q ascends with air bubbles preferentially over mineral P. ( 4 voters )

0%(C) Both minerals P and Q ascend with the air bubbles without preference. ( 0 voters )

0%(D) Both minerals P and Q sink to the bottom. ( 0 voters )

Based On 14 Votes

0%(A) P-1, Q-3, R-2, S-4 ( 0 voters )

83.33%(B) P-3, Q-1, R-2, S-4 ( 15 voters )

0%(C) P-4,Q-2, R-3, S-1 ( 0 voters )

16.67%(D) P-3, Q-1, R-4, S-2 ( 3 voters )

Based On 18 Votes

16.67%(A) P-4,Q-1,R-2,S-3 ( 2 voters )

0%(B) P-3,Q-1,R-4,S-2 ( 0 voters )

66.67%(C) P-3,Q-4,R-1,S-2 ( 8 voters )

16.67%(D) P-4,Q-2,R-3,S-1 ( 2 voters )

Based On 12 Votes

0%(A) Haematite ( 0 voters )

3.33%(B) Magnetite ( 1 voter )

86.67%(C) Ilmenite ( 26 voters )

10%(D) Pyrolusite ( 3 voters )

Based On 30 Votes