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affect the hardness of the material zinc ore equipment

Zinc Alloys: Properties, Processing and Applications Matmatch

Aside from zinc, zinc alloys usually contain aluminium, copper, magnesium and iron. Aluminium has a considerable solubility in zinc, and it is often added in the foundry process to increase fluidity and reduce the melting temperature. Aluminium also improves some mechanical properties such as elongation. Copper is another common constituent in zinc alloys.Copper zinc alloys, also known as brass, haveenhanced properties such as tensile strength, hardness, wear resistance, and creep. Magnesium, in relatively small quantities, is an important zinc alloying metal as it improves the grain structure and prevents inter granular corrosion typically caused by impurities. Table 1.Properties of Zinc Alloys

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Historically, zinc had been produced from its oxide ores before the discovery of its sulphide ores, which are far more abundant in nature. The most common ore of zinc is zinc sulphide, also called zinc blende. There are two main methods of producing zinc: the pyro metallurgical method and the hydrometallurgical method. By 1916, the hydrometallurgical process had replaced the pyro metallurgical process as the primary production process of zinc .

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Zinc alloys are used for building and architectural applicationssuch as rainwater systems, claddings, fittings and roofing. Zinc alloys also find application as sacrificial componentssuch as fuses, shear bolts/pins and sacrificial anodes in corrosion protection. Zinc alloys are also used in electromagnetic shieldingto protect devices from electromagnetic fields. Brass has an excellent combination of mechanical properties such as strength, ductility, wear and corrosion resistance, electrical and thermal conductivity, hardness and machinability, which makes it suitable for a wide range of applications. These can be broadly divided into two; decorative and mechanical. Such applications include household fittings, jewellery, engine parts, pumps, valves, fasteners and clock components. Other zinc alloys are used in certain types of machine bearings, die casting and stamping dies. Zinc is also used for medical equipment, rubber prod...

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There are many grades of zinc alloys, with more than 25 currently in use. Many of them have proprietary or commonly known names. The most well known zinc alloy is brass, which is composed of copper and zinc. There currently exist over 600 EN standards of brass. The main types of brass are differentiated by their crystal structure, which depends on the ratio of copper to zinc, and are separated into alpha brass, beta brass, alpha beta brass, gamma brass and white brass. Zamak is a common family of zinc alloys which are composed of aluminium, magnesium and copper. They are distinct in that they contain a fixed amount of aluminium at 4%. Tombak is a brass alloy with a low quantity of zinc and a high quantity of copper . Zinag alloys consist of zinc, aluminium and silver. They have low density, are resistant to corrosion, and have good mechanical properties. Silver imparts superplasticity on the alloy making it deformable without significant loss of its mechanical...

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