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Industrial minerals
Published in Francis P. Gudyanga, Minerals in Africa, 2020
The beneficiation of azurite as a gemstone from ores is similar to that for other gemstones described elsewhere in section 6.6 to follow. Combining aqueous solutions of copper(II) sulphate and sodium carbonate yields basic copper carbonate precipitate. 2CuSO4+2Na2CO3+H2O→Cu2(OH)2CO3+2Na2SO4+CO2
Metals in the workplace
Published in Sue Reed, Dino Pisaniello, Geza Benke, Kerrie Burton, Principles of Occupational Health & Hygiene, 2020
Another essential element, copper finds common use in electrical wiring, alloys of brass, bronze or Monel, plumbing services and cookware. Copper is also used in insecticides and as an algaecide and a bactericide, and in electroplating. Industrial exposure to copper fume is not common—copper melts at about 2350°C—though the fume can give rise to a metal-fume fever similar to that caused by zinc. Copper salts, copper carbonate and copper sulfate are all relatively safe to use, provided proper precautions are taken to prevent inhalation or accidental ingestion of dusts. Ingestion of copper has occurred accidentally when acidic foodstuffs have been in contact with copper vessels (e.g. fruit juice, moonshine liquor from copper stills). Copper exposure presents no significant problem in industry, other than for workers with Wilson’s disease, a rare genetic inability to excrete excess copper.
Metals in the workplace
Published in Sue Reed, Dino Pisaniello, Geza Benke, Principles of Occupational Health & Hygiene, 2020
Another essential element, copper finds common use in electrical wiring, alloys of brass, bronze or Monel, plumbing services and cookware. Copper is also used in insecticides and as an algaecide and a bactericide, and in electroplating. Industrial exposure to copper fume is not common—copper melts at about 2350°C—although the fume can give rise to a metal-fume fever similar to that caused by zinc. Copper salts, copper carbonate and copper sulfate are all relatively safe to use, provided proper precautions are taken to prevent inhalation or accidental ingestion of dusts. Ingestion of copper has occurred accidentally when acidic foodstuffs have been in contact with copper vessels (e.g. fruit juice, moonshine liquor from copper stills). Copper exposure presents no significant problem in industry, other than for workers with Wilson’s disease, a rare genetic inability to excrete excess copper.
The influence of the nature of carboxylate precursors on the composition and tribological performance of copper-containing nanomaterials
Published in Journal of Coordination Chemistry, 2020
Igor E. Uflyand, Igor N. Shcherbakov, Leonid D. Popov, Vladimir A. Irkha, Ekaterina G. Drogan, Elena G. Zadoshenko, Victoria E. Burlakova, Oxana V. Kharissova
Copper capronate and valerate are well-studied compounds that are synthesized by direct interaction of sodium capronate or valerate with a small excess of the required amount of copper sulfate [46]. According to thermogravimetry and differential scanning calorimetry [47–49], the complete thermal decomposition of these compounds occurs at temperatures above 300 °C; therefore, nanomaterials were obtained by thermolysis of these compounds at 300 °C. The products obtained by thermolysis of copper capronate and valerate were studied by XRD analysis, which made it possible to obtain data on their phase composition and crystallite sizes. The assignment of peaks corresponding to CuO and Cu2O was carried out according to literature data [50]. Peaks in the region of 2θ less than 8° correspond to the region of amorphous carbon. The analysis of XRD patterns (Figure 1) shows that, regardless of the thermolysis time, copper(I) oxide is the main decomposition product of copper capronate. At a thermolysis time of 20 to 40 min, copper carbonate is formed together with the oxide. When conducting thermal decomposition of salt for more than 60 min, reflections of copper(I) oxide and copper appear on the XRD pattern.
EUROCORR 2017 in combination with the 20th International Corrosion Congress and the Process Safety Congress 2017: Corrosion Control for safer living part 3
Published in Corrosion Engineering, Science and Technology, 2018
The ‘Use of green inhibitors and pre-treated carbon steel (CS) for reduced corrosion in post-combustion capture infrastructure’ was discussed by Samara Sadeek (Imperial College, London, UK). Blank CS specimens and specimens pre-treated with 5M methyldiethanolamine (MDEA) were immersed for seven days in 5M monoethanolamine (MEA) in the presence or absence of green inhibitors. These were copper carbonate (CC), Sodium thiosulphate (STS) and 2-mercaptobenzimidazole (MBI). The pre-treatment developed a closely packed bed of siderite (hexagonal FeCO3) crystals which afforded corrosion resistance. In the absence of pre-treatment, CC inhibitor afforded protection, with no demonstrable surface change after immersion. STS provided some protection, while MBI was least effective. The combination of MDEA pre-treatment with an inhibitor proved counterproductive during immersion, with the siderite crystals being largely destroyed by CC, or impaired by STS or MBI.
Direct smelting process of copper carbonate ore using SiO2 as fluxing agent in electric arc furnace
Published in Canadian Metallurgical Quarterly, 2023
Fakhreza Abdul, Muhammad Ikhwan Rahman, Yuli Setiyorini, Vuri Ayu Setyowati, Sungging Pintowantoro
The copper ore (Originated from West Sumatera, Indonesia) used in the study had a copper content of 15.66%. The dominant impurities in copper ore were iron 22.75%, silicon 16.56%, and calcium 12.21%. The chemical composition of copper carbonate ore is shown in Table 1. The ore’s chemical composition was obtained using Energy Dispersive X-Ray Spectroscopy (EDS).