- •The national technical university of ukraine.
- •Science in ukraine
- •From the history of computer
- •What is a computer?
- •Economic-technological development and ecology problems
- •Pollution in ukraine
- •Integer, refining, profusion, to improve, destructive
- •Automation and labour
- •Automatic control in industry
- •Economy and industry of ukraine
- •Industry of great britain
- •Lesson 1. Metals
- •Lesson 2. Occurrence of metals Task 1. Look at the following words and try to guess their meaning: ore, constituent, absorption, mineral, metallurgy
- •Properties of metals
- •Density, hardness, heat conductivity, electrical conductivity, weight
- •Blast furnace. Cupola melting
- •Open hearth furnace. The electric furnace
- •The electric furnace. The finest grades of steel are produced by the electric furnace method. Stainless and heat resistant steels are made almost exclusively by that process.
- •Ferrous metals
- •Properties of engineering materials
- •Problem of engineering materials
Blast furnace. Cupola melting
Task 1. What types of furnaces do you know?
Task 2. Try to guess the meaning of the following words and word combinations (if you need you can use dictionary): metallurgical plant, iron ore, fusion, carbon, melting unit
Task 3. Read and translate the following text:
The modern blast-furnace constitutes the largest and most complicated type of metallurgical plant. Such a plant is capable of producing more than one thousand tons of pig iron a day. It consumes large quantities of raw materials. The material entering the blast furnace consists of the iron ore, the flux (limestone), and a fuel.
The blast-furnace derived its name from the fact that the air to support combustion must be forced into it under pressure, because of the resistance offered by the column of material within the shaft to passage of the combustion gases. The air is usually blown in the bottom through the tuyeres.
The term "charge" refers to the materials fed at the top and includes the fuel, the ore and the flux.
The blast-furnace is a circular shaft of varying dimensions made of fire brick. The furnace has cylindrical crucible at its base for the molten products to be collected. The diameter of the shaft is the biggest in the zone of fusion. A typical blast-furnace is shown in Fig. 5.
Chemical reactions between carbon, oxygen, and iron and its oxides occur within the blast-furnace. As a result of these reactions pig iron and slag are produced.
The cupola is a small blast-furnace used to remelt pig iron for the purpose of making iron castings in the foundry.
Cupola Melting. Most of the gray cast iron produced in this country is melted in the cupola furnace. The cupola is a vertical cylindrical type of furnace, consisting of a steel shell lined with firebrick. Usually the charging door is located 15 to 25 ft above the bottom plate. At the lower end of the furnace is a wind box or air box. Air enters the cupola openings called tuyeres. Some cupolas are equipped with a single row of tuyeres; others have an auxiliary upper row of tuyeres. Opinion is divided as to whether a single or a double row is more desirable. A patented cupola known as the "balanced blast cupola", developed by the British Cast Iron Research Association, has three rows of tuyeres. A number of furnaces of this type have been installed in this country.
The cupola is a simple and economical melting unit, because the fuel and the metal are in intimate contact with each other. Fuel, metal and flux enter the cupola through the charging door. The initial charge of coke is known as the "bed charge". The metal is deposited on the coke. Then alternate layers of coke and iron are added.
Generally a flux is charged on the coke and the coke bed ignited by means of kindling wood or an oil torch. This bed usually extends from 36 to 60 in. above the top of the lower tuyeres. The make up of the charge and the charging are most important in obtaining uniform results in melting.
Task 4. Find in the text equivalents to the following words and expressions:
доменна піч, металургійний завод, чавун у чушках, сировина, руда, тиск, опір, фурма, шихта, матеріали, що подаються, шахта (печі), вогнетривка цегла, тигель, зона плавлення, шлак, виливки, купол, сірий чавун, вагранка, стальна оболонка, завантажувальний люк, подова плита, отвори, плавильна одиниця, холоста колоша (завалка), прошарок коксу, кільцева труба, необроблений матеріал, флюс, підтримувати процес згоряння, залізні виливки, розплавлені продукти, хімічні реакції, споживати, тиск, опір, продувати
Task 5. Translate into Ukrainian the following words and word combinations:
to constitute, to be capable, to produce, pig iron, large quantities, raw materials, to consist of, iron ore, limestone, fuel, to be forced into, passage, combustion gases, to blow, bottom, charge, to feed, to include, flux, blast-furnace, varying dimensions, fire brick, cylindrical crucible, molten products, to occur, slag, cupola, to remelt, castings, foundry, wind box, single row, "bed charge", coke, alternate layers, to add, kindling wood, oil torch, uniform results, melting
Task 6. Make word combinations from the words in column A and column B:
-
A
B
complicated
materials
raw
gases
pig
furnace
combustion
type
molten
castings
blast
iron
iron
crucible
cylindrical
products
Task 7. Complete the sentences using the given words:
… is the material entering the blast furnace. … is a small blast furnace used to remelt pig iron. … is the most complicated type of metallurgical plant. … is designed for the collection of molten products. … are the parts of the blast furnace through which the air is blown in. |
the cupola the blast furnace the charge the tuyeres the crucible |
Task 8. Fill in the gaps with the verbs given below. Put them in proper tense form:
-
equip produce blow include charge locate melt
1. Blast furnace _____ more than one thousand tons of pig iron a day.
2. The charge _____ the fuel, the ore and the flux.
3. Usually the air _____ in the bottom through the tuyeres.
4. Most of grey iron _____ in the cupola.
5. The charging door of the cupola _____ 15 - 25 ft above the bottom plate.
6. Some cupolas _____ with a single row of tuyeres; others - two or three rows.
7. A flux _____ on the coke.
Task 9. Fill in the table using the information from the text.
-
Melting unit
Design of the unit
Charge
Purpose
Blast furnace
Task 10. Give the detailed description of the blast furnace and cupola according to the table above.
Task 11. Answer the following questions:
1. What is the most complicated type of metallurgical plant?
2. List the materials entering the blast furnace. How many tons of pig iron is the blast furnace capable to produce?
3. Give a detailed description of the blast furnace.
4. Give a detailed description of the cupola.
Task 12. Memorize the following words and word combinations:
1. |
auxiliary |
допоміжний |
2. |
blast-furnace |
доменна піч |
3. |
circular shaft |
кругла шахта |
4. |
combustion |
згоряння |
5. |
to consume |
споживати |
6. |
crucible |
тигель |
7. |
cupola |
вагранка |
8. |
to derive |
отримувати, виводити |
9. |
fire brick |
вогнетривка цегла |
10. |
flux |
флюс |
11. |
fuel |
паливо |
12. |
gray cast iron |
сірий чавун |
13. |
to install |
встановлювати, збирати, монтувати |
14. |
iron castings |
залізні виливки |
15. |
kindling wood |
деревина для розпалювання |
16. |
lime |
вапно |
17. |
limestone |
вапняк |
18. |
metallurgical plant |
металургійний завод |
19. |
pig iron |
залізо в чушках |
20. |
pressure |
тиск |
21. |
raw material |
сировина, необроблений матеріал |
22. |
slag |
шлак |
23. |
to support |
підтримувати, зберігати |
24. |
tuyere |
фурма |
25. |
wind (air) box |
повітряна коробка |
Lesson 5.
BESSEMER PROCESS
Task 1. What processes of making steel do you know?
Task 2. Can you describe the Bessemer converter? What are the many parts of it?
Task 3. Read and translate the following text:
In the Bessemer process no fuel is used. The pig iron from the blast-furnace is poured molten into the converter, and a strong blast of air is sent up through it. The air first oxidises the silicon and manganese, which, together with some iron oxide, rise to the top and form a slag. The blowing is continued until the carbon content is lowered to about 0.05%. When the blow is completed the amount of carbon necessary to bring the carbon content to the specified percentage, together with manganese to counteract the influence of sulphur, and silicon to degasify, are added to the molten metal. The finished steel is then poured into a ladle, and hence it is poured into the ingot molds for subsequent rolling or forging.
The Bessemer converter, in which the process takes place, is a pear-shaped tilting vessel made of steel plates and lined with heat-resisting bricks and clay. The top of the converter is cut off to form a mouth through which molten metal is charged and discharged. In the bottom of the vessel are a number of holes through which air is blown.
When the air blast is turned on, a shower of sparks bursts from the mouth of the converter. Immediately thereafter appear short ruddy flames and a dense cloud of reddish-brown fumes caused by the burning of the silicon and manganese in the iron. In about five minutes this part of the refining action is accomplished, and the next stage, the removal of carbon, begins.
The ruddy flames become more luminous, changing to a yellowish white.
For about ten minutes the glare continues, and during that time the converter emits a deep roar caused by the violent generation of gas within it.
Suddenly the flame drops, and the operator must diminish the blast of air and remove the metal from the converter.
Bessemer steel is considered to be inferior to steel produced by other methods. It is still used because of low cost of its production, cost of the process.
Today we have a new, more perfect technology of converting pig iron into steel in which the blast of air is replaced by a jet of nearly pure oxygen.
Bessemer steel refined additionally in the open-hearth, or electric furnace, is called duplex steel.
Task 4. Find in the text equivalents to the following words and expressions:
паливо, заливатися розплавленим, чавун, домна, утворювати шлак, прокат і кування, виливниця (рос. изложница), вогнетривка цегла, нахилена ємність, глина, розплавлений метал, отвори, готова сталь, верхівка конвертера, дуплексна сталь, додатково очищати, оксид заліза, ківш, видалення вуглецю, мартенівська піч
Task 5. Translate into Ukrainian the following words and word combinations:
to oxidize, to refine additionally, to charge, to discharge, to accomplish the stage, reddish-brown fumes, to emit a deep roar, low cost of production, to counteract, steel plates, vessel, ruddy flames, silicon, the amount of carbon, to pour the molten iron, the blast of air, dense cloud, low cost of production, steel plates, to be charged and discharged
Task 6. Make word combinations from the words in column A and column B:
-
A
B
carbon
plate
ingot
blast
steel
content
molten
oxide
duplex
action
iron
metal
air
steel
refining
molds
Task 7. Fill in the gaps with the suitable words. Put them in proper tense form. Translate the sentences.
-
to pour, to refine, to consider, to continue, to oxidize, to use, to pour, to send, to add
1. The pig iron from the blast-furnace _____ into the converter, and a strong blast of air _____ up through it.
2. The air _____ the silicon and manganese, which, together with some iron oxide, rise to the top and form a slag.
3. The blowing _____ until the carbon content is lowered to about 0.05%.
4. Then some amount of carbon, manganese, and silicon _____ to the molten metal.
5. The finished steel _____ into a ladle.
6. Bessemer steel _____ to be inferior to steel produced by other methods.
7. Bessemer steel _____ because of low cost of its production, cost of the process.
8. Bessemer steel _____ additionally in the open-hearth or electric furnace.
Task 8. Translate the following sentences into English:
1. Розплавлений метал заливається в конвертер, а потім продувається повітрям.
2. До вуглецю додається марганець з метою нейтралізації дії сірки.
3. Сталь можливо виготовити за допомогою складного Бесемерівського процесу.
4. Бесемерівський процес складається з підготовки шлаку, очищення, та видалення вуглецю.
Task 9. Describe the Bessemer process using the given words.
to use fuel
to pour molten pig iron
to send air through, to oxidize silicon and manganese, to form a slag
to continue the blowing, to lower the carbon content
to add the amount of carbon, silicon, and manganese
to pour the finished steel (into a ladle, into the ingot molds)
Task 10. Make up questions to the text “Bessemer process”.
Task 11. Memorize the following words and word combinations:
1. |
to add |
додавати |
2. |
blowing |
продування |
3. |
to burst |
розриватися |
4. |
convertor |
перетворювач |
5. |
to counteract |
перешкоджати, заважати |
6. |
to cut off |
відрізати |
7. |
to degasify |
дегазувати |
8. |
to diminish |
зменшувати |
9. |
duplex steel |
сталь-дуплекс |
10. |
forging |
ковка |
11. |
glare |
яскраве сяяння |
12. |
heat-resisting brick |
теплостійка цегла |
13. |
ingot mold |
изложница |
14. |
ladle |
ківш |
15. |
luminous |
той, що сяє |
16. |
manganese |
марганець |
17. |
molten metal |
розплавлений метал |
18. |
to pour |
лити (метал) |
19. |
reddish-brown fume |
червоно-коричневий дим |
20. |
refining |
очищення |
21. |
rolling |
прокатка |
22. |
silicon |
кремній |
23. |
spark |
іскра |
24. |
tilting vessel |
нахилена ємність |
25. |
violent generation |
інтенсивне виробництво |
Lesson 6.