Gr 9 NATURAL SCIENCES: CH 4.3 Crushing and milling
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Questions and Answers

What is the purpose of crushing in mineral processing?

  • To store ore in a container
  • To mix ore with other materials
  • To separate minerals from waste rock
  • To break down large chunks of ore into smaller pieces (correct)

    • What type of crusher uses two plates to crush rocks by moving back and forth?

  • Jaw Crusher (correct)
  • Cone Crusher
  • Rod Mill
  • Ball Mill

    • What is the function of manganese steel surfaces in Cone Crushers?

  • To reduce the size of the rocks
  • To make the crusher more decorative
  • To line the surfaces of the crusher (correct)
  • To increase the weight of the crusher

    • What is the purpose of milling in mineral processing?

    <p>To grind the ore into a fine powder</p> Signup and view all the answers

    What is used as grinding media in a Rod Mill?

    <p>Long rods</p> Signup and view all the answers

    What is the motion of the balls in a Ball Mill?

    <p>The balls grind the ore by tumbling within the mill</p> Signup and view all the answers

    What is required for crushing and milling?

    <p>Significant amounts of energy</p> Signup and view all the answers

    What is the primary reason why breaking rocks into fine powder is an energy-intensive process?

    <p>To break down chemical bonds that hold minerals in compound form</p> Signup and view all the answers

    Which mineral is found in its pure form in nuggets and grains?

    <p>Gold</p> Signup and view all the answers

    What is phosphate rock used directly for?

    <p>As a fertilizer or to make phosphoric acid</p> Signup and view all the answers

    Which of the following rocks does not require crushing or milling for mineral extraction?

    <p>Phosphate rock</p> Signup and view all the answers

    What is silicon dioxide used in?

    <p>The construction industry</p> Signup and view all the answers

    Why is some coal washed and sorted into various sizes?

    <p>To make it more suitable for use as a fuel</p> Signup and view all the answers

    What is the primary use of coal?

    <p>As a fuel for electricity generation or in the iron-making process</p> Signup and view all the answers

    Which of the following minerals is not found in its pure form?

    <p>Phosphate</p> Signup and view all the answers

    What is the analogy used to describe the distribution of mineral crystals in rocks?

    <p>Chocolate chips in a choc chip biscuit</p> Signup and view all the answers

    Which of the following crushers breaks rocks by squeezing them between an eccentrically gyrating spindle and a concave hopper?

    <p>Cone Crusher</p> Signup and view all the answers

    What is the purpose of the rods or balls in Rod Mills and Ball Mills?

    <p>To crush the ore into a fine powder</p> Signup and view all the answers

    What is the difference between Rod Mills and Ball Mills?

    <p>The type of grinding media used</p> Signup and view all the answers

    What is the result of the crushing and milling process?

    <p>Fine powder</p> Signup and view all the answers

    Why are crushing and milling important steps in mineral processing?

    <p>To separate the minerals from the waste rock</p> Signup and view all the answers

    What is the consequence of crushing and milling requiring significant amounts of energy?

    <p>The process becomes more energy-intensive</p> Signup and view all the answers

    What is the reason why some minerals do not require extraction processes?

    <p>They are found in their pure form</p> Signup and view all the answers

    Which of the following rocks can be used directly as a fuel?

    <p>Coal</p> Signup and view all the answers

    What is the primary use of crushed rocks in mineral processing?

    <p>To extract minerals from compounds</p> Signup and view all the answers

    What is the purpose of washing and sorting coal?

    <p>To create different sizes for various applications</p> Signup and view all the answers

    What is the characteristic of minerals that are found in their pure form?

    <p>They do not require extraction processes</p> Signup and view all the answers

    What is the purpose of breaking rocks down into fine powder?

    <p>To extract minerals from compounds</p> Signup and view all the answers

    What is silicon dioxide used in?

    <p>The construction industry</p> Signup and view all the answers

    What is the characteristic of phosphate rock?

    <p>It is used directly as a fertilizer</p> Signup and view all the answers

    What is the primary purpose of the funnel in a Jaw Crusher?

    <p>To feed the rocks into the crusher</p> Signup and view all the answers

    What is the main difference between the motion of the rods in a Rod Mill and the motion of the balls in a Ball Mill?

    <p>The rods tumble within the mill, while the balls move in a circular motion</p> Signup and view all the answers

    Why is crushing and milling a significant step in mineral processing?

    <p>To access the mineral crystals distributed throughout the rocks</p> Signup and view all the answers

    What is the primary function of the manganese steel surfaces in a Cone Crusher?

    <p>To protect the crusher from wear and tear</p> Signup and view all the answers

    What is the result of the crushing and milling process?

    <p>Finer particles of ore</p> Signup and view all the answers

    Why are Jaw Crushers typically used as the first step in mineral processing?

    <p>Because they can handle large chunks of ore</p> Signup and view all the answers

    What is the main advantage of using steel balls as grinding media in a Ball Mill?

    <p>They are more durable than rods</p> Signup and view all the answers

    What is the primary reason why some minerals are not found in their pure form?

    <p>They require breaking down of chemical bonds that hold them in compound form.</p> Signup and view all the answers

    What is the characteristic of rocks that can be used directly for mineral extraction?

    <p>They do not require crushing or milling.</p> Signup and view all the answers

    What is the main difference between gold and diamonds?

    <p>Gold is found in nuggets, while diamonds are found in crystals.</p> Signup and view all the answers

    What is the primary reason why some coal is washed and sorted into various sizes?

    <p>To make it suitable for different applications.</p> Signup and view all the answers

    What is the common characteristic of phosphate rock, silicon dioxide, and coal?

    <p>They can be used directly for mineral extraction.</p> Signup and view all the answers

    What is the primary reason why breaking rocks into fine powder is an energy-intensive process?

    <p>It demands a lot of power to break down the chemical bonds.</p> Signup and view all the answers

    What is the main purpose of mineral extraction?

    <p>To obtain minerals that are used in various industries.</p> Signup and view all the answers

    What is the common characteristic of minerals that are found in their pure form?

    <p>They do not require crushing or milling.</p> Signup and view all the answers

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