In what types of industrial furnaces are chromite refractories applied _______________?
Show answer Hide answer
Answer: C. Both A. & B.
Explanation
Chromite refractories are chemically neutral, making them ideal parting layers between acidic and basic brickwork. Their neutral chemistry prevents direct chemical reactions and eutectic melting between incompatible refractory types. They also provide excellent wear resistance and thermal stability when installed at the bottom of soaking pits. Acidic silica bricks and basic magnesite bricks react destructively with each other at high furnace temperatures. Placing a neutral chromite barrier between dissimilar refractory walls prevents premature chemical degradation. Soaking pits reheat steel ingots prior to rolling, requiring durable bottom hearth refractories to handle scale.
Option A is partially correct for soaking pits but ignores their essential function as chemical parting barriers. Option B correctly describes their role between acid and basic linings but omits their application in soaking pits. Option C is correct because chromite refractories successfully serve both as parting layers and soaking pit bottoms.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
Related questions
Q1. In which specific industrial application are carbon refractories exclusively utilized _________________?
Show answer Hide answer
Answer: A. Hearth of blast furnace
Carbon refractories possess exceptional chemical resistance to molten iron and slag along with high thermal conductivity. These specific properties prevent chemical erosion and thermal shock failure in the high-wear blas...
Q2. What is the approximate cold crushing strength of standard fireclay bricks ______________ kgf/cm2?
Show answer Hide answer
Answer: C. 200-400
Standard fireclay bricks manufactured commercially typically display room temperature compressive strength between two hundred and four hundred. This strength range ensures they withstand the structural weight of stacked...
Q3. Combining ceramic and metallic components gives cermets superior strength and high-temperature resistance, making them ideal for use in _______________?
Show answer Hide answer
Answer: B. Nuclear reactors, missiles & space crafts
Cermets combine the heat resistance and hardness of ceramics with the toughness and ductility of metallic binders. This unique microstructural combination provides superior high-temperature strength and thermal shock res...
Q4. What is the typical color associated with standard fireclay bricks _________________?
Show answer Hide answer
Answer: A. Light buff to reddish buff
Standard fireclay bricks are manufactured from naturally occurring plastic clays containing iron oxide impurities. During high-temperature kiln firing, iron compounds oxidize and impart a characteristic light buff to red...
Q5. The cold crushing strength of refractory materials is primarily determined by _________________?
Show answer Hide answer
Answer: D. All A., B. and C.
Chemical composition determines the inherent mineral phases and refractoriness of the manufactured refractory brick. Texture, including porosity and grain size distribution, directly affects the internal stress distribut...
Q6. When silica minerals convert into cristobalite, what physical dimension experiences a reduction ____________________?
Show answer Hide answer
Answer: B. Specific gravity
Cristobalite is a high-temperature allotropic crystalline form of silica with a more open crystal lattice structure. During the conversion from lower density quartz to cristobalite, the crystal structure expands signific...