Smelting is a process of applying heat to ore, to extract a base metal. It is a form of extractive metallurgy. It is used to extract many metals from their ores, including silver, iron, copper, and other base metals. Smelting uses heat and a chemical reducing agent to decompose the ore, driving off other elements as gases or slag and leaving the metal base behind. The reducing agent is commonly a fossil fuel source of carbon, such as coke—or, in earlier times, charcoal. The oxygen in the ore binds to carbon at high temperatures due to the lower potential energy of the bonds in carbon dioxide. Smelting most prominently takes place in a blast furnace to produce pig iron, which is converted into steel.
Johannesburg, colloquially known as Jozi, Joburg, or "The City of Gold", is the largest city in South Africa, classified as a megacity, and is one of the 100 largest urban areas in the world. According to Demographia, the Johannesburg–Pretoria urban area is the 26th-largest in the world in terms of population, with 14,167,000 inhabitants. It is the provincial capital and largest city of Gauteng, which is the wealthiest province in South Africa. Johannesburg is the seat of the Constitutional Court, the highest court in South Africa. Most of the major South African companies and banks have their head offices in Johannesburg. The city is located in the mineral-rich Witwatersrand range of hills and is the centre of large-scale gold and diamond trade.
Slag is a by-product of smelting (pyrometallurgical) ores and used metals. Broadly, it can be classified as ferrous, ferroalloy or non-ferrous/base metals. Within these general categories, slags can be further categorized by their precursor and processing conditions.
A blast furnace is a type of metallurgical furnace used for smelting to produce industrial metals, generally pig iron, but also others such as lead or copper. Blast refers to the combustion air being "forced" or supplied above atmospheric pressure.
Mpumalanga is a province of South Africa. The name means "East", or literally "The Place Where the Sun Rises" in the Swazi, Xhosa, Ndebele and Zulu languages. Mpumalanga lies in eastern South Africa, bordering Eswatini and Mozambique. It constitutes 6.5% of South Africa's land area. It shares borders with the South African provinces of Limpopo to the north, Gauteng to the west, the Free State to the southwest, and KwaZulu-Natal to the south. The capital is Mbombela. Mpumalanga was formed in 1994, when the area that was the Eastern Transvaal was merged with the former bantustans KaNgwane, KwaNdebele and parts of Lebowa and Gazankulu. Although the contemporary borders of the province were only formed at the end of apartheid, the region and its surroundings has a history that extends back thousands of years. Much of its history, and current significance is as a region of trade.
The Wealden iron industry was located in the Weald of south-eastern England. It was formerly an important industry, producing a large proportion of the bar iron made in England in the 16th century and most British cannon until about 1770. Ironmaking in the Weald used ironstone from various clay beds, and was fuelled by charcoal made from trees in the heavily wooded landscape. The industry in the Weald declined when ironmaking began to be fuelled by coke made from coal, which does not occur accessibly in the area.
Sophiatown, also known as Sof'town or Kofifi, is a suburb of Johannesburg, South Africa. Sophiatown was a black cultural hub that was destroyed under apartheid, It produced some of South Africa's most famous writers, musicians, politicians and artists. Rebuilt under the name of Triomf, and in 2006 officially returned to its original name. Sophiatown was one of the oldest black areas in Johannesburg and its destruction represents some of the excesses of South Africa under apartheid.
Alberton is a city situated on the southern part of the East Rand of the Gauteng Province in South Africa and is situated very close to the major urban centre of Johannesburg.
Lydenburg, officially known as Mashishing, is a town in Thaba Chweu Local Municipality, on the Mpumalanga highveld, South Africa. It is situated on the Sterkspruit/Dorps River tributary of the Lepelle River at the summit of the Long Tom Pass. It has a long, rich history, ranging from AD 500 to the present. The name is derived from the Dutch Lijdenburg, or "Town of Suffering", and is named for the experiences of the white settlers. In Northern Sotho, Mashishing means "long green grass." Lydenburg has become the centre of the South African fly-fishing industry and is an agricultural, tourism and mining hub.
A bloomery is a type of metallurgical furnace once used widely for smelting iron from its oxides. The bloomery was the earliest form of smelter capable of smelting iron. Bloomeries produce a porous mass of iron and slag called a bloom. The mix of slag and iron in the bloom, termed sponge iron, is usually consolidated and further forged into wrought iron. Blast furnaces, which produce pig iron, have largely superseded bloomeries.
The Lonehill Koppie is a hill located in the suburb named after it, Lone Hill, which is located in Gauteng, South Africa. It is notable for the legends that surround the large boulder that sits atop the hill, precariously balanced on several other boulders.
Brixton is a predominantly working class suburb of Johannesburg, South Africa. It is the site of the landmark Sentech Tower, and is near the suburbs of Auckland Park and Melville.
Ferrous metallurgy is the metallurgy of iron and its alloys. The earliest surviving prehistoric iron artifacts, from the 4th millennium BC in Egypt, were made from meteoritic iron-nickel. It is not known when or where the smelting of iron from ores began, but by the end of the 2nd millennium BC iron was being produced from iron ores in the region from Greece to India, and Sub-Saharan Africa. The use of wrought iron was known by the 1st millennium BC, and its spread defined the Iron Age. During the medieval period, smiths in Europe found a way of producing wrought iron from cast iron using finery forges. All these processes required charcoal as fuel.
L'Anse aux Meadows is an archaeological site, first excavated in the 1960s, of a Norse settlement dating to approximately 1,000 years ago. The site is located on the northernmost tip of the island of Newfoundland in the Canadian province of Newfoundland and Labrador near St. Anthony.
Klipriviersberg Nature Reserve is a nature reserve consisting of veld and koppies (hills) run by the Johannesburg City Parks. It is located 11 kilometres (6.8 mi) south of Johannesburg, in an area of 640 hectares. Home to many species of flora and bird life, it is also home to large and small mammals such as blesbok, zebra, wildebeest and duiker. The reserve has a number of hiking trails and archaeological sites, with the Bloubosspruit flowing through the area.
Trevelgue Head, also known as Porth Island, is a headland north-east of Newquay, Cornwall, England, next to Porth at the eastern end of Newquay Bay.
Kemondo Iron Age Sites or KM2 and KM3 are Early Iron Age complex industrial archaeological sites in Kemondo ward, Bukoba Rural District, Kagera Region, Tanzania, excavated by a team led by archaeologist Peter Schmid in the late 1970s and 1980s. The excavations aimed at better understanding the iron smelting process and its ritual aspects in East Africa. At the KM2 and KM3 sites, Schmidt tested the hypothesis that the high combustion temperature of furnaces, discovered to be between 1,350–1,400 °C (2,460–2,550 °F), was caused by the preheating of air blasts. Preheating has been suggested to be a distinct feature of African Early Iron Age smelting techniques by ethnographic observations of the Haya people of northwestern Tanzania.
Westdene is a suburb of Johannesburg, South Africa. Westdene lies between the historic suburb of Sophiatown and Melville with the Melville Koppies West nature reserve to the north of the suburb. Westdene derives its name from its location, literally meaning west-valley. 'West' since it is located west from the city centre and with 'dene' derived from the Old English denu, meaning valley.
The Bogolong iron mine and blast furnace is an abandoned iron mining and smelting site, near Bookham, New South Wales, Australia. Located in an area known best for sheep grazing and wool, it has been called Australia's 'forgotten furnace'. In 1874, the blast furnace produced a small amount of pig iron—sufficient to allow its testing—that was smelted from iron ore mined nearby. Plans to operate commercially did not eventuate. It is significant as one of the only three remaining ruins of 19th-Century iron-smelting blast furnaces in Australia, and the only one in New South Wales.
Revil John Mason was a South African archaeologist. He was Professor of Archaeology at the University of the Witwatersrand.
