Secondary copper processing

Secondary copper processing involves two steps: metal pretreatment and smelting. Pretreatment includes cleaning and concentrating the copper. Concentrating is done manually or mechanically and includes sorting, stripping, shredding and magnetic separation. The metal can be further refined using pyrometallurgical methods - including sweating, insulation burning, or drying - or hydrometallurgical methods - including flotation and leaching. The concentrated metal is then smelted. Generally, copper is fire refined, similar to primary copper smelting operations although the exact procedure depends on the quality of copper scrap.

Task 1

Give Ukrainian equivalents to the following words and word combinations:

beaten out into leaves, fine wire, malleability and ductility, cold rolling, tenacity, specific gravity, commercial copper, given off during solidification, sound casting of copper, be volatilised, easily powdered, conductor of electricity, presence of impurities, moist air, plunging the copper, slowly dissolved, earth's crust, copper art, chemical activity, blue vitriol, fusible at furnace temperature, red heat, charcoal, strong affinity, poisonous, pest and fungi control, purification from the admixtures, liver, bones, spinal fluid

Task 2	Match the words in column A with their meanings from column B:
	A	B
	1. conductor	a) точка кипіння
	2. solubility	b) пористість
	3. density	c) чорнова мідь
	4. melting point	d) провідник
	5. boiling point	e) крихкість
	6. fusion	f) вапно
	7. brittleness	g) точка плавлення
	8. porosity	h) плавлення
	9. blister copper	i) розчинність
	10. lime	j) густина

Task 3

Fill in the correct words from the list below. Use each word only once.

cuprous, change, wires, commercial, red colour, obtaining, compounds, surpassed, malleability, carbonate, thin, conductor

1. electric … and cables	7. metal of a …
2. properties of …and ductility	8. difficulty of …sound casting
3. copper …are poisonous	9. no … in dry air
4. a … of electricity	10. very …sheets
5. ordinary … copper	11. … by silver
6. basic …is formed	12. formation of …oxide

Task 4	Fill in the gaps with the verbs given below used in the proper tense form.
to use, to contain, to exist, to present, to have, to be, to heat, to become

1. There _______ two oxides of copper- red and black.

2. This metal _______ such properties as plasticity and conductivity of electricity and heat.

3. When copper _______ to near its melting point it becomes so brittle that it may be easily powdered.

4. In human organism copper _______ in liver, bones, in blood and spinal fluid.

5. Copper _______ hard after cold rolling or other mechanical treatment but its malleability is regained by annealing.

6. We _______ copper compounds for manufacturing of catalysts, preparations for pest and fungi control, etc.

7. The melting point of Cu _______ about 1,083° C.

8. Cobalt, nickel, gold, silver, zinc, lead, bismuth _______ in copper ores as admixtures.

Task 5

Match the following words to form the word combinations. Translate them into Ukrainian.

1. open	a. impurities
2. segregated	b. liners
3. remaining	c. solvent
4. cylindrical	d. vessel
5. wire-rod	e. pits
6. organic	f. copper
7. acid resistant	g. layers
8. blister	h. mills

Task 6

Find the endings to the following verbs and translate them into Ukrainian:

1. to float	a. gases
2. to be disposed of	b. into a furnace
3. to feed	c. "fire refining"
4. to collect	d. with the metal oxide
5. to sink	e. to the top of the slurry
6. to react	f. to the bottom
7. to remove	g. on site
8. to be discarded	h. in tailing ponds
9. to undergo	i. remaining sulfur

Task 7

Make a short report on the topic Primary and secondary production of copper, do not forget to mention such aspects as:

1. processing methods for refining concentrated copper

● pyrometallurgical process

● hydrometallurgical process

2. two steps of secondary copper processing

● pretreatment

● smelting

Дата добавления: 2015-07-20