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How is ore-dressing of iron done?
  • a)
    Froth Flotation
  • b)
    Magnetic separation
  • c)
    Hand picking
  • d)
    By wetting
Correct answer is option 'B'. Can you explain this answer?
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How is ore-dressing of iron done?a)Froth Flotationb)Magnetic separatio...
 In magnetic separators, the effect of magnetism is used to separate ferromagnetic materials from non-magnetic materials. In principle, this process is also suitable for the iron ores siderite and hematite, which become weakly magnetic when heated.
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How is ore-dressing of iron done?a)Froth Flotationb)Magnetic separatio...
Ore Dressing of Iron

Iron ore is an important raw material for iron and steel production. It undergoes a series of processes known as ore dressing or mineral processing to extract the valuable minerals from the ore. The ore dressing process involves various steps that utilize different properties of the ore to separate the valuable minerals from the gangue, or waste rock.

There are several methods of ore dressing for iron. Some of the commonly used methods are as follows:

Froth Flotation
Froth flotation is a commonly used method for ore dressing of iron ores. It utilizes the differences in the physical and chemical properties of the minerals present in the ore and the gangue. In this method, the finely ground ore is mixed with water and specific reagents are added to create a froth that selectively separates the valuable minerals from the gangue. The froth is then collected and dried to obtain the concentrate, which contains the valuable minerals.

Magnetic Separation
Magnetic separation is another commonly used method for ore dressing of iron ores. It utilizes the magnetic properties of the minerals present in the ore. In this method, the finely ground ore is passed over a magnetic roller or drum. The magnetic particles in the ore are attracted to the magnetic roller and are separated from the non-magnetic particles. The magnetic concentrate is then collected and further processed to obtain the desired iron ore concentrate.

Hand Picking
Hand picking is a simple and primitive method of ore dressing. It involves manually picking out the valuable minerals from the ore by hand. This method is usually used for rich ores that contain large visible crystals of the valuable mineral. However, hand picking is not a widely used method for ore dressing of iron ores due to its labor-intensive nature and limited applicability.

Wetting
Wetting is not a specific method of ore dressing for iron ores. It may refer to the wetting of the ore with water during the ore dressing process. Wetting is often done to facilitate the separation of the valuable minerals from the gangue by creating a slurry or suspension of the ore particles in water.

In conclusion, magnetic separation is a commonly used method for ore dressing of iron ores. It utilizes the magnetic properties of the minerals present in the ore to separate them from the gangue. Other methods such as froth flotation, hand picking, and wetting may also be used depending on the specific characteristics of the ore and the desired end product.
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Read the following text and answer the following questions on the basis of the same:Super magnet The term super magnet is a broad term and encompasses several families of rare-earth magnets that include seventeen elements in the periodic table; namely scandium, yttrium, and the fifteen lanthanides. These elements can be magnetized, but have Curie temperatures below room temperature. This means that in their pure form, their magnetism only appears at low temperatures. However, when they form compounds with transition metals such as iron, nickel, cobalt, etc. Curie temperature rises well above room temperature and they can be used effectively at higher temperatures as well. The main advantage they have over conventional magnets is that their greater strength allows for smaller, lighter magnets to be used. Super magnets are of two categories: (i) Neodymium magnet: These are made from an alloy of neodymium, iron, and boron. This material is currently the strongest known type of permanent magnet. It is typically used in the construction of head actuators in computer hard drives and has many electronic applications, such as electric motors, appliances, and magnetic resonance imaging (MRI). (ii) Samarium-cobalt magnet: These are made from an alloy of samarium and cobalt. This second strongest type of rare Earth magnet is also used in electronic motors, turbo-machinery, and because of its high temperature range tolerance may also have many applications for space travel, such as cryogenics and heat resistant machinery. Rare-earth magnets are extremely brittle and also vulnerable to corrosion, so they are usually plated or coated to protect them from breaking, chipping, or crumbling into powder. Since super magnets are about 10 times stronger than ordinary magnets, safe distance should be maintained otherwise these may damage mechanical watch, CRT monitor, pacemaker, credit cards, magnetically stored media etc. These types of magnets are hazardous for health also. The greater force exerted by rare-earth magnets creates hazards that are not seen with other types of magnet. Magnets larger than a few centimeters are strong enough to cause injuries to body parts pinched between two magnets or a magnet and a metal surface, even causing broken bones. Neodymium permanent magnets lose their magnetism 5% every 100 years. So, in the truest sense Neodymium magnets may be considered as a permanent magnet.Super magnets are about _____ time stronger than ordinary magnets.

Read the following text and answer the following questions on the basis of the same:Super magnetThe term super magnet is a broad term and encompasses several families of rare-earth magnets that include seventeen elements in the periodic table; namely scandium, yttrium, and the fifteen lanthanides. These elements can be magnetized, but have Curie temperatures below room temperature. This means that in their pure form, their magnetism only appears at low temperatures. However, when they form compounds with transition metals such as iron, nickel, cobalt, etc. Curie temperature rises well above room temperature and they can be used effectively at higher temperatures as well. The main advantage they have over conventional magnets is that their greater strength allows for smaller, lighter magnets to be used. Super magnets are of two categories: (i) N eodymium magnet: These are made from an alloy of neodymium, iron, and boron. This material is currently the strongest known type of permanent magnet. It is typically used in the construction of head actuators in computer hard drives and has many electronic applications, such as electric motors, appliances, and magnetic resonance imaging (MRI). (ii) Samarium-cobalt magnet: These are made from an alloy of samarium and cobalt. This second strongest type of rare Earth magnet is also used in electronic motors, turbo-machinery, and because of its high temperature range tolerance may also have many applications for space travel, such as cryogenics and heat resistant machinery. Rare-earth magnets are extremely brittle and also vulnerable to corrosion, so they are usually plated or coated to protect them from breaking, chipping, or crumbling into powder. Since super magnets are about 10 times stronger than ordinary magnets, safe distance should be maintained otherwise these may damage mechanical watch, CRT monitor, pacemaker, credit cards, magnetically stored media etc.These types of magnets are hazardous for health also. The greater force exerted by rare-earth magnets creates hazards that are not seen with other types of magnet. Magnets larger than a few centimeters are strong enough to cause injuries to body parts pinched between two magnets or a magnet and a metal surface, even causing broken bones. Neodymium permanent magnets lose their magnetism 5% every 100 years. So, in the truest sense Neodymium magnets may be considered as a permanent magnet.Curie point of pure rare Earth elements is

How is ore-dressing of iron done?a)Froth Flotationb)Magnetic separationc)Hand pickingd)By wettingCorrect answer is option 'B'. Can you explain this answer?
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