Table of Contents
What is the waste product of blast furnace?
Blast furnace slag is a nonmetallic coproduct produced in the process. It consists primarily of silicates, aluminosilicates, and calcium-alumina-silicates. The molten slag, which absorbs much of the sulfur from the charge, comprises about 20 percent by mass of iron production.
What is the use of the waste gases in the extraction of iron?
Waste gases produced by the blast furnace When using iron sulfide (FeS2, pyrite) as the iron ore, sulfur dioxide (SO2) may also be produced as a waste gas. Carbon dioxide emissions increase the greenhouse effect, whereas sulfur dioxide is a pollutant and contributor to acid rain.
Why coke is used in blast furnace not coal?
Coke is used as a fuel and a reducing agent in melting iron ore. It is produced by baking coal until it becomes carbon by burning off impurities without burning up the coal itself. When coke is consumed it generates intense heat but little smoke, making it ideal for smelting iron and steel.
Is blast furnace slag toxic?
When SSRS compares with ground granulated blast furnace slag (GGBFS) from iron making, steel slag contains toxic ingredients such as nickel, cadmium, chromium and strontium. These compounds could be harmful not only for environment but also for human health [9,10].
Why is iron converted into steel?
The combustion of iron ore with other materials in the blast furnace produces molten pig iron, which is then converted to steel. Blowing oxygen forces impurities (oxides, silicates, phosphates, etc.) to react with flux to form slag or escape through the top of the furnace as fumes.
What was the iron used for?
Iron is an enigma – it rusts easily, yet it is the most important of all metals. 90% of all metal that is refined today is iron. Most is used to manufacture steel, used in civil engineering (reinforced concrete, girders etc) and in manufacturing.
Which is the better fuel coal and coke?
Coke is a better fuel than coal because; -Coke produces more heat on burning than coal. -Coke has a higher calorific value than coal. When equal masses of coke and coal are burnt, coke produces more heat.
Why coke is not used as fuel?
Answer: because fuel has different properties than coke as fuel can help a car move and coke can’t do do that as it does not have the chemicals to complete that task …
Is slag harmful to humans?
How Dangerous are Slugs? It may be a surprise, but slugs can cause harm. If a human were to eat one of these infectious slugs, the parasites would travel into the brain and even the spinal cord causing tissue damage. This could even be transmitted from the residue that slugs leave behind on vegetables or salad greens.
How is slag toxic?
What are uses of steel?
Steel is one of the most widely used materials, with applications in construction, engineering, agriculture and the manufacture of cars. With more than 50% of all products in the world coming from steel and steel fabrication processes, it is estimated that there are over 20 billion tonnes of steel currently in use!
Why is iron produced in a blast furnace is converted into steel?
The combustion of iron ore with other materials in the blast furnace produces molten pig iron, which is then converted to steel. Oxygen reacts with the high levels of carbon in the pig iron and scrap to form CO and CO2.
What are the many waste gases from the blast furnace?
There are not “many” waste gases. In fact, there are only 5: the N2 from the hot air blast to burn the coke (48%), the CO (23%) and CO2 (21%) produced from the reduction of the iron ore Fe2O3 by carbon (the coke), some H2 (7.6%) and a bit of CH4 (0.05%).
What was the beauty of the blast furnace?
Waste Gases from the Blast Furnace. 4~1 beauty of model. The machinery was constructed by Hogg and Dela- mater, of New York, who have been tbr several years accustomed to the construction of machinery for screw steamers, and this job has the appear- ance of strength without any extra finish.
What can coke gas and blast furnace be used for?
Both gases can be used to create hot water, steam and electricity. The hot water and exhaust gases from the engines are fed into boilers. The resulting steam can be used within the steel production processes. Electricity generated by the Jenbacher engines can either be used on-site or sold to the public grid.
Where does the steam from a blast furnace go?
The hot water and exhaust gases from the engines are fed into boilers. The resulting steam can be used within the steel production processes. Electricity generated by the Jenbacher engines can either be used on-site or sold to the public grid.