Electrostatic Separation

 

The electrostatic method separates particles of different electrical charges and, when possible, of different sizes. When particles of different polarity are brought into an electrical field, they follow different motion trajectories and can be caught separately. Electrostatic separation is used in all plants that process heavy mineral sands bearing zircon, rutile, and monazite. In addition, the cleaning of special iron ore and cassiterite concentrates as well as the separation of cassiterite-scheelite ores are conducted by electrostatic methods.

Exercise 41

World-building. Put the words into the four columns according to their suffixes:

concentration, sufficiently different,visible, radiation, simulate, suspension, density,

magnetic, heavier, influence, horizontal, different, separate, physicochemical, intensity, electrostatic, separately.

 

noun	verb	adjective	adverb

 

Exercise 42

Cross the odd word out:

magnetite	franklinite	copper	pyrrhotite
grinding	separation	crushing	ore
vertical	chemical	method	horizontal
removing	crushing	grinding	singing
zircon	rutile	monazite	gold
grinder	higher	miller	separator

 

Exercise 43

Match heads and tails:

 

1.In heavy-media separation	a) can be effectively separated in a flowing stream of water on horizontal or inclined planes.
2. Finer-grained particles	b) the medium used is a suspension in water of a finely ground heavy mineral or technical product
3. The air bubbles	c) a water stream is pulsed, or moved by pistons upward and downward, through the material bed.
4. Flotation	d) on inclined planes is carried out on shaking tables, which can be smoothed or grooved and which are vibrated back and forth at right angles to the flow of water.
5.In the process called jigging,	e) containing the hydrophilic minerals, can be removed from the bottom of the cell.
6. Gravity concentration	f) is used in all plants that process heavy mineral sands bearing zircon, rutile, and monazite
7.High-intensity devices	g) pass to the upper surface of the pulp and form a froth, which, together with the attached hydrophobic minerals, can be removed.
8. The tailings,	h) is the most widely used method for the concentration of fine-grained minerals.
9.Electrostatic separation	i) Is based on the differing degrees of attraction exerted on various minerals by magnetic fields.
10.Magnetic separation	j) can separate oxide iron ores such as limonite and siderite as well as iron-bearing manganese, titanium, and tungsten ores and iron-bearing silicates.

 

Exercise 44

Complete the expressions given below:

heavy concentrates

technical density

lower task

cassiterite spiral

vertical mineral

air separators

gold side

ground methods

inner material

hydrophilic product

impossible conditions

electrostatic results

magnetic bubbles

good ores

 

 

Exercise 45

Use the text to give definitions to the following processes:

 

Optical Separation _____________________________________________________

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Gravity Separation _____________________________________________________

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Flotation separation____________________________________________________

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Magnetic Separation___________________________________________________

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Electrostatic separation_________________________________________________

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Jigging _____________________________________________________________

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Flotation_____________________________________________________________

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Heavy-media separation ________________________________________________

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