Copper is an important basic material and widely used in many fields, such as electricity, light industry, industrial machinery, electronics, transportation, communication and national defense, etc. Copper mining is an important part of the Australian mining, Australia is the world’s important copper producer. In 2008, the amount of copper production accounted for 5.7% of the world’s copper production which made Australia be the world’s fifth largest copper producer. Australia has proved reserves of 77.8 million tons of copper resources accounting for 12.9% of the world’s proved reserves.
Environmental Awareness in Australia
With the vast land and rich natural resources, Australia still attaches great importance to ecological environment protection, adheres to sustainable development path, especially pays attention to the development of circular economy to bring a broader development prospects.
Australian government focuses on renewable resources recycling work and defines the range of renewable resources to the waste generated in the whole production activities. As a developed country, Australia in the volume per capita production of waste is second to the United States. In order to solve the problem, the federal government and state governments determine the solid waste reduction plan in 1992. By 2000, the amount of solid waste decreased by 50% than that in 1992. Although it did not achieve the above goals, but also very effective.
Australians have a strong environmental awareness and regard all waste as renewable resources, there are a lot of garbage processing plants. For example, MRI company in Australia. Except for those electronic products processing disassemble facilities, copper wire processing equipment such as Copper Wire Granulator was imported from Sweden and applied in a copper wire recycling. What you need to do is to put the waste copper wire into the feeding device. Then the copper and plastic will be separated.
The Meaning of Waste Recycling and Copper Wire Recycling
Waste recycling is the process of remanufacturing used or waste products into new valuable materials. Here are some reasons why waste recycling is important. Firstly,waste recycling is a good way to preserve limited natural resources.Secondly,waste recycling is a good way to make extra profit and reduce unnecessary cost . Last but not least, waste recycling is a good way to reduce pollution to our earth.
With a large amount of copper wire needed and massive copper wire scrap generating, it is certain that the future of copper cable granulator will be bright and its manufacturing craft will get improved.
Copper wire recycling plays an important role in making up for the shortage of refined copper. How to make full use of copper wire scrap depends on the quality of itself. For those high grade copper scraps, people often reuse them directly while for those low quality copper scrap, practitioners in copper recycling mainly adopts pyrometallurgy to get refined copper.
The Sources of Scrap Copper
1. Scrap and waste produced during the process of the copper smelting.2. Copper scrap and waste produced during the process of all kinds of mechanical processing.3. Copper from the old and scrapped instruments and machinery equipment.Copper scrap can be divided into different kinds according to its production stages: disposable scrap copper during industrial production, new scrap copper generated during processing and old copper scrap used.
A. Disposable Scrap Copper
Those scrap copper such as unqualified embryo and anode waste can’t be processed further or sold, which usually are put the converter or electrolytic refining anode furnace again and generally does not enter the copper scrap market.
B. The New Scrap Copper
New copper scrap refers to the new leftover material. Processing ways to new copper scrap depends on the chemical composition and the combination degree between it and other materials. The simplest approach is the internal recycling,remelting and casting.
C. The Old Copper Scrap
Old copper scrap refers to the old, used or copper scrap from products,which has reached the useful life . Old copper scrap are the huge potential resources which can be recycled but difficult to deal with. For now, waste cables and wires are higher amount and higher recycling rate ones.
Processing Recycling Methods-Copper Scrap Recycling
The precondition for directly using copper scrap is making strict classification of copper scrap and then adding the required elements, thus decreasing the percentage of impurities to get qualified copper alloy. At present, the percentage of directly using copper scrap in those developed countries like America, German and UK has occupied 40%-60% of total copper consumption.
Then come to the main topic: FRHC refining craftwork, that is, using pyrogenic process to get high conductive copper. This method uses copper scrap of which copper content is over 92% as raw material and utilizes these crafts such as smelting and continuous casting to get bright copper rod. The copper content of such copper rod is over 99.93% and the conductivity of it has reached 100.9% IACS.The essence and core of FRHC processing technology is to adjust the impurity composition and oxygen content, rather than to minimize the content of impurities. They make analysis and research of the main 15 impurities in copper scrap with the assistance of computer and find how to get the copper alloy by the impurities’ chemical interact with each other through long-term research which
will not influence the conductivity of copper. By this way, the copper content gets improved greatly.Then the following content focuses on the pretreatment of copper scrap wire and cable technology, recycling part mainly introduces Australian secondary copper factory process.
The pretreatment of the scrap wire and cable. The purpose of the pretreatment of the scrap wire and cable is to separate copper and insulating layer, the methods mainly are classified into four kinds:
1.Mechanical separation method which can be divided into two kinds.
A. Drum-type peeling machining method.
The method is suitable for processing the scrap wire and cable with the same diameter.
Scrap wire and cable first is sheared into less than 300 mm segments, and then conveyed into special drum cutter in which wire and cable is broken and peeled. Debris enter the screen hole through a belt to bin and then are chosen in clastic bed so as to get copper scrap, mixture and plastic fiber. Copper scrap can be directly as copper smelting raw material and also can be used for raw material to produce copper sulfate.
This process has the following features:a. Comprehensively recycling the cable and plastic of copper scrap wire, a high comprehensive utilization rate; b. The copper scrap contains no plastics and reduce the pollution to the atmosphere during the melting.c. Simple craft and easy to mechanize and automate;
The disadvantages of this equipment is high power consumption and quick blade wear speed.
B. cutting type peeling machining method.The method is suitable for processing thick cables and wires
2. Low Temperature Freezing Method
The United States patent -No. 3990641 came up with low temperature freezing method to separate the copper and insulating layer of the waste wires. Low temperature freezing method is suitable for processing all kinds of wires and cables. Freezing makes insulation brittle first and shocking separates the insulation layer and the copper wire.
3. Chemical Stripping Method
The method adopts a kind of organic solvent to dissolve insulating layer of the waste wire to separate the copper wire and insulation layer. The advantage of this method is to get high quality copper wire, but the disadvantage is that the solvent is difficult to deal with , and the price of solvent is higher. the development direction of the technology is to study a cheap practical effective solvent.
4. Thermal decomposition
The United States patent-No.4040865 proposed to get copper wire through burning insulating layer by thermal decomposition method. Scrap wires and cables are sheared first, then conveyed into feeder to enter the pyrolysis chamber. The copper wire through pyrolysis is transported to discharging hole by grate conveyor and then loaded into products collector. The copper wire can be used as raw material in the production of refined copper. Gas produced by the pyrolysis is conveyed into the combustion chamber to burn the combustible material, and then discharged after entering the reactor using calcium oxide to absorb the chlorine gas. Calcium chloride can be used as a building material.Copper wire recycling plays an important role in making up for the shortage of refined copper. How to make full use of copper wire scrap depends on the quality of itself. For those high grade copper scraps, people often reuse them directly while for those low quality copper scrap, practitioners in copper recycling mainly adopts pyrometallurgy to get refined copper.