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Questions and Answers

What is the primary factor that affects the cold strength of sinter as determined by the tumbler test?

Ore composition

Strength of individual ore components

Strength of bonding matrix components

All of the above (correct)

What is the temperature at which the RDI static test is carried out?

500 °C

650 °C

550 °C (correct)

600 °C

What is the term used to describe the percentage presence of –3mm fraction of coke in any sample?

Coke particle size

Coke degradation index

Coke crushing index (correct)

Coke crushing strength

What is the order of fracture strength of mineral phases, from highest to lowest?

Primary hematite > secondary hematite > magnetite > ferrites Signup and view all the answers

Why is the cold mechanical strength of sinter important?

It affects the formation of fines during transportation and handling Signup and view all the answers

What is the purpose of the RDI static test in sinter quality control?

To predict the sinter's degradation behavior in the lower part of the blast furnace stack Signup and view all the answers

What is the minimum percentage required for the coke crushing index to ensure a better sintering process?

85% Signup and view all the answers

What is the typical temperature at which the burn through point is reached?

400°C Signup and view all the answers

What is the primary function of screens in the sintering process?

Screening out different sizes Signup and view all the answers

What is the purpose of proportioning bins in the sintering process?

Adjusting the feeding Signup and view all the answers

What is the function of grab cranes in the sintering process?

Lifting coke Signup and view all the answers

What is the minimum percentage required for the flux crushing index to ensure a better sintering process?

90% Signup and view all the answers

What is the ideal percentage of water in the base mix to maintain optimal sinter bed permeability?

7 to 8% Signup and view all the answers

What is the consequence of using a higher percentage of water in the base mix?

Decreased sintering speed and reduced bed permeability Signup and view all the answers

What is the purpose of maintaining an optimum air/gas ratio in the ignition furnace?

To maintain a consistent ignition temperature Signup and view all the answers

What is the consequence of a very high hearth temperature in the ignition furnace?

Fusing of sinter at the top layer, reducing bed permeability Signup and view all the answers

What is the role of coke in the sintering process?

To act as a solid fuel in the base mix Signup and view all the answers

What is the consequence of a low coke rate in the sintering process?

Incomplete sintering and increased recirculating load Signup and view all the answers