Question:
In a three-layer refining of Aluminium, the impure Aluminium is alloyed with which of the metals to form a bottom layer?
In a three-layer refining of Aluminium, the impure Aluminium is alloyed with which of the metals to form a bottom layer?
Show Hint
Three-layer refining depends on density differences between immiscible molten metal layers.
Updated On: Jun 29, 2026
- Titanium
- Manganese
- Nickel
- Copper
Show Solution
Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Concept:
Three-layer (Hoopes) refining is used for purification of aluminium. It is based on:
- difference in density of molten layers
- immiscibility between layers
- electrorefining principle
The system forms:
- bottom layer (heaviest alloy)
- middle layer (impure Al)
- top layer (pure Al)
Step 1: Role of alloying metal.
Impure aluminium is alloyed with a heavy metal to increase density so that it forms the bottom layer.
Step 2: Selection of metal.
Copper is used because: - it increases density significantly - forms a heavy molten alloy with aluminium - remains stable at operating temperature Final Answer: \[ \boxed{\text{Copper}} \]
Step 1: Role of alloying metal.
Impure aluminium is alloyed with a heavy metal to increase density so that it forms the bottom layer.
Step 2: Selection of metal.
Copper is used because: - it increases density significantly - forms a heavy molten alloy with aluminium - remains stable at operating temperature Final Answer: \[ \boxed{\text{Copper}} \]
Was this answer helpful?
0
0
Top TS PGECET Metallurgical Engineering Questions
- “It is impossible for a heat engine to be 100% efficient.” This statement is related to:
- If a system is completely ordered and the atoms are at rest at zero Kelvin, then the entropy of the system is:
- Electrodes used in anodizing process are:
- Units for quantity of electricity are:
- Identify the wrong statement:
View More Questions
Top TS PGECET Fundamental Process of Ore Refining Questions
- Xanthates are used as:
- Primary step of ore processing is:
- Liberation is done for:
- Direct coal is charged as fuel in:
- TISCO located at:
View More Questions
Top TS PGECET Questions
- If \( P = \begin{pmatrix} 1 & 1 & 1 \\ 0 & 1 & 2 \\ 0 & 0 & 1 \end{pmatrix} \) is the modal matrix of \( A = \begin{pmatrix} 1 & 1 & 0 \\ 0 & 2 & 2 \\ 0 & 0 & 3 \end{pmatrix} \) then the sum of all the elements of \( P^{-1}AP \) is
- If the system of equations \( kx + y + z = k - 1 \), \( x + ky + z = k - 1 \), and \( x + y + kz = k - 1 \) has infinite solutions, then \( k \) is
- The value of the integral \( \int_C (2xy - x^2) \, dx + (x^2 + y^2) \, dy \) where \( C \) is the boundary of the region enclosed by \( y = x^2 \) and \( y^2 = x \), described in the positive sense, is
- Let \( f(x) = \log x \). The number \( C \) strictly between \( e^2 \) and \( e^3 \) such that its reciprocal is equal to \( \frac{f(e^3) - f(e^2)}{e^3 - e^2} \) is
- The solution of the differential equation \( (D^2 + 2)y = x^2 \) is
View More Questions