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When the ore haematite is burnt in air w...

When the ore haematite is burnt in air with coke around `2000 K` along with lime, the process not only produces steel but also produces a silicate slag that is useful in making building materials such as cement. Discuss the same and show through balanced chemical equation.

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The correct Answer is:
Heamatite `(Fe_(2)O_(3))` on burning with coke and lime at `2000K` in blast furnace results in the following.
(i) Upper zone
`(400^(@)C "to" 700^(@)C) Fe_(2)O_(3) +3CO rarr 2Fe +3CO_(2)`
`{:(3Fe_(2)O_(3)+CO rarr 2Fe_(3)O_(4)+CO_(2) ,),(Fe_(3)O_(4)+CO rarr 3FeO +CO_(2),),(underline(FeO+CO rarr Fe +CO_(2)),):}`
This reaction occurs in following steps:
(ii) Middle zone
`(800^(@)C "to" 1000^(@)C) C +CO_(2) rarr 2CO`
`FeO +CO rarr Fe(s) +CO_(2)`
(iii) Upper lower zone Impure iron metals
`(1200^(@)C "to" 1500^(@)C) CaO +SiO_(2) rarr CaSiO_(3)` (slag)
(iv) Lower zone Phosphates and silicates are reduced.
`(1500^(@)C "to" 1600^(@)C)P` and S pass into molten iron
`C + O_(2) rarr CO_(2)`
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The existence of negatively charged particle in an atom was shown by J.J. Thomson as a result of the studies of the passage of electricity through gases at extremely low pressure known as discharge tube experiments. When a high voltage of the order of 10,000 volts or more was impressed across the electrodes, some sort of invisible rays moved from the negative electrode to the positive electrode these rays are called as cathode rays. Cathode rays travel in straight path in absence of electrical and magnetic field . Cathode rays consist of material part and charged particles? Cathode rays produce X-rays and light is emitted when they strike on ZnS screen. Cathode rays penetrate through thin sheets of aluminium and other metals . They affect the photogenic plate and passes heating effect when they strike on metal foil. The raito of charge to mass i.e charge/mass is same for all the cathode rays irrespective of the gas used in the tube. The existence of positively charged particle in an atom was shown be E. Goldstein. He repeated the same discharge tube experiments by using a perforated cathode. It was observed that when a high potential difference was applied between the electrodes, not only cathode rays were produced but also a new type of rays were produced simultaneoulsy from anode moving towards cathode and passes through the holes or canal of the cathode. These termed as canal rays or anode rays. These rays travel in straight lines and consists of positively charged particles. These rays have kinetic energy and produces heating effect also. The e/m ratio of these rays is smaller than that of electrons. Unlike cathode rays, their e/m value is dependent upon the nature of the gas taken in the tube. These rays produced flashes of light on ZnS screen and can pass throughs thin metal foils. They can produce physical and chemical changes and are capable to produce ionisation in gases. Select the incorrect statement.

The existence of negatively charged particle in an atom was shown by J.J. Thomson as a result of the studies of the passage of electricity through gases at extremely low pressure known as discharge tube experiments. When a high voltage of the order of 10,000 volts or more was impressed across the electrodes, some sort of invisible rays moved from the negative electrode to the positive electrode these rays are called as cathode rays. Cathode rays travel in straight path in absence of electrical and magnetic field . Cathode rays consist of material part and charged particles? Cathode rays produce X-rays and light is emitted when they strike on ZnS screen. Cathode rays penetrate through thin sheets of aluminium and other metals . They affect the photogenic plate and passes heating effect when they strike on metal foil. The raito of charge to mass i.e charge/mass is same for all the cathode rays irrespective of the gas used in the tube. The existence of positively charged particle in an atom was shown be E. Goldstein. He repeated the same discharge tube experiments by using a perforated cathode. It was observed that when a high potential difference was applied between the electrodes, not only cathode rays were produced but also a new type of rays were produced simultaneoulsy from anode moving towards cathode and passes through the holes or canal of the cathode. These termed as canal rays or anode rays. These rays travel in straight lines and consists of positively charged particles. These rays have kinetic energy and produces heating effect also. The e/m ratio of these rays is smaller than that of electrons. Unlike cathode rays, their e/m value is dependent upon the nature of the gas taken in the tube. These rays produced flashes of light on ZnS screen and can pass throughs thin metal foils. They can produce physical and chemical changes and are capable to produce ionisation in gases. Which is not true with respect to cathode rays?

Knowledge Check

  • When the ore, haemattie in burnt in air with coke around 2000^(@)C along with lime, the process not only produces steel but also produces a slag that is useful in making building materials. The slag is

    A
    `Na SiO_(3)`
    B
    `CaSiO_(3)`
    C
    `SiO_(2)`
    D
    `CaCO_(3)`

  • When the ore, haemattie in burnt in air with coke around 2000^(@)C along with lime, the process not only produces steel but also produces a slag that is useful in making building materials. The slag is

    A
    `Na SiO_(3)`
    B
    `CaSiO_(3)`
    C
    `SiO_(2)`
    D
    `CaCO_(3)`

  • Limestone is a naturally occuring form of calcium carbonate. It is used as building materials and also for manufacture of other building materials such as portland cement. It is used for the production of quickline and slaked lime which have wide applications in chemical, metallugical and construction industry. The pure CaCO_(3) , called precipitated calcium carbonate, is used extensively as filler, providing bulk to materials such as paint, plastics, printing links and rubber. it is also used in toothpastes, cosmetics and antacids. Quicklime and slaked lime are the cheapest and the most widely used bases for neutralising unwanted acids. Lime is used to neutralise acidic soils. An important application of quicklime is in air pollution control for the removal of SO_(2) in electric power plants. slaked lime is used in the manufature of other alkalis and bleacing powder, in sugar refinig, in tanning hide and in water softening. Chemical compound (A) is used to remove temporary hardness from water. It reacts with Na_(2)CO_(3) to generated caustic soda. when CO_(2) is passed through (A) it turns cloudy. What is (A) ?

    A
    `CaCO_(3)`
    B
    `Ca(HCO_(3))_(2)`
    C
    `Ca(OH)_(2)`
    D
    `CaCl_(2)`

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