Extraction from copper pyrites:
Extraction of copper from copper pyrites includes the steps shown below:1. Crushing and concentration:
The ore is first crushed and then concentrated by froth-floatation procedure.
2. Roasting:
The concentrated ore is heated strongly in reverberatory furnace, in the excess of air. During roasting,
i) Moisture is eliminated.ii) The volatile impurities are eliminated.iii) Phosphorus, Sulphur, arsenic and antimony that are present as impurity are eliminated as volatile oxides.S + O2 → SO2P4 + 5O2 → 2P2O54As + 3O2 → 2As2O3iv) The copper pyrite is partially transformed into sulphides of copper and iron.
2CuFeS2 + O2 → Cu2S + 2FeS + SO22FeS + 3O2 → 2FeO + 2SO23. Smelting:
The roasted ore is mix with powdered coke and sand and then heated in a blast furnace. It is made up of steel plates lined within with fire clay bricks. Hot air at 800°C is introduced from the tuyers close to the base of the furnace. As an outcome, the following changes take place.2FeS + 3O2 → 2FeO + 2SO2FeO + SiO2 → FeSiO3 (fusible slag)2Cu2S+ 3O2→ 2Cu2O + 2SO2Cu2O + FeS → Cu2S + FeOFeO + SiO2 → FeSiO3 (fusible slag)As an outcome of smelting, two separate molten layers are generated at the bottom of the furnace. The upper layer comprises of slag and is eliminated as a waste whereas the lower layer is termed as matte. It mainly consists of cuprous sulphide and few unchanged ferrous sulphide.4. Bessemerisation:
The molten matte is transferred to a Bessemer converter. The Bessemer is mounted on horizontal axis and is fitted with small pipes termed as tuyeres via which a blast of hot air and fine sand is entered.
Any arsenic, sulphur, and antimony yet present escape as their respective oxides. Ferrous sulphide present in matte is oxidised into ferrous oxide that joins with silica to form slag.
2FeS + 3O2 → 2FeO + 2SO2FeO + SiO2 → FeSiO3 (slag)A few of the cuprous sulphide undergoes oxidation to form cuprous oxide which then reacts with additional cuprous sulphide to provide copper metal. The impure metal so obtained is termed as blister copper and is around 98% pure.
2Cu2S + 3O2 → 2Cu2O + 2SO22Cu2O + Cu2S → 6Cu + SO25. Refining:
Blister copper has around 2% of impurities and it is purified by electrolytic refining.Electrolytic Refining:
This technique is used to acquire metal of high degree of purity. For electrolytic refining of copper,
i) A block of impure copper metal performs as anode.ii) A thin plate of pure copper metal performs as cathode.iii) Copper sulphate solution acidified with sulphuric acid is carried as electrolyte.Whenever electric current is passed via the electrolytic solution pure copper get deposited on the cathode, impurities settle close to the anode in the form of sludge termed as anode mud.
Latest technology based Chemistry Online Tutoring Assistance
Tutors, at the www.tutorsglobe.com, take pledge to provide full satisfaction and assurance in D Block Elements homework help via online tutoring. Students are getting 100% satisfaction by online tutors across the globe. Here you can get homework help for D Block Elements, project ideas and tutorials. We provide email based D Block Elements homework help. You can join us to ask queries 24x7 with live, experienced and qualified online tutors specialized in D Block Elements. Through Online Tutoring, you would be able to complete your homework or assignments at your home. Tutors at the TutorsGlobe are committed to provide the best quality online tutoring assistance for Inorganic-Chemistry Homework Help and assignment help services. They use their experience, as they have solved thousands of the Chemistry assignments, which may help you to solve your complex issues of D Block Elements. TutorsGlobe assure for the best quality compliance to your homework. Compromise with quality is not in our dictionary. If we feel that we are not able to provide the homework help as per the deadline or given instruction by the student, we refund the money of the student without any delay.
tutorsglobe.com functions of skin assignment help-homework help by online skin tutors
tutorsglobe.com waste water treatment assignment help-homework help by online waste management tutors
tutorsglobe.com plant viral disease assignment help-homework help by online viruses tutors
tutorsglobe.com types of networks assignment help-homework help by online computer networks tutors
tutorsglobe.com dynamics of filtration assignment help-homework help by online mechanism of urine formation tutors
return on ordinary funds of shareholders, return on capital employed, operating profit margin, gross profit margin.
Principles of Mass Spectrometry tutorial all along with the key concepts of The Mass Spectrometer, Molecular Ion, The Mass Spectrum and EI Mass Spectrum of Bromododecane
two inputs basic gates such as nor, nand ,ex-or, using ttl and ic and verify the truth tables.
www.tutorsglobe.com offers Benefits and Pitfalls of Use Cases homework help, assignment help, case study, writing homework help, online tutoring assistance by computer science tutors.
tutorsglobe.com natural immunity assignment help-homework help by online immunity tutors
There is broad agreement that financial reporting standards have enhanced the quality of financial statements. However, we should be aware to the potential problems related with their use.
Living Organisms tutorial all along with the key concepts of Classifications of Living Organisms, Hierarchy of Living Organisms, Binomial Nomenclature, Kingdoms of Living organisms, Kingdom Plantae and Kingdom Animalia
tutorsglobe.com atopy assignment help-homework help by online hypersensitivity-anaphylaxsis tutors
tutorsglobe.com economic importance assignment help-homework help by online biology in human welfare tutors
tutorsglobe.com mechanism of muscle contraction assignment help-homework help by online muscles tutors
1947923
Questions Asked
3689
Tutors
1449848
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!