scholarly journals Study on recovery of copper and zinc from cyanide lean solution in a smelting company

2021 ◽  
Vol 271 ◽  
pp. 04004
Author(s):  
Qin Guanglin ◽  
Li Guangsheng ◽  
Zhu Xingfu ◽  
Gao Tengyue ◽  
Chen Yanbo ◽  
...  
Keyword(s):  
Theoretical Calculation ◽  
Ph Value ◽  
Copper Concentrate ◽  
Copper Precipitation ◽  
High Copper ◽  
Copper And Zinc ◽  
Copper Zinc

In the process of cyanidation of gold concentrate from a smelting company, the content of copper and zinc in the liquid gradually increased. In production, acidizing process is used to treat the lean solution from high copper concentrate, and mixed products containing copper, zinc and other metals are produced. In this paper, the pH value of zinc precipitation is 6.0 and the pH value of copper precipitation is 3.0 through theoretical calculation and experiment. The separation of copper and zinc in the lean solution is realized successfully. The zinc product with grade of 42.97% and the copper product with grade of 58.33% are produced.

Serum copper and zinc levels and copper/zinc ratio in patients with breast cancer

1994 ◽  
Vol 40 (1) ◽  
pp. 31-38 ◽  
Author(s):  
Idris Yücel ◽  
Fikret Arpaci ◽  
Ahmet Özet ◽  
Bülent Döner ◽  
Turan Karayilanoĝlu ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Serum Copper ◽  
Copper And Zinc ◽  
Copper Zinc ◽  
Zinc Levels

Effect of Activating Device on the Properties of Tap Water

2010 ◽  
Vol 178 ◽  
pp. 86-91 ◽  
Author(s):  
Dong Mei Zhang ◽  
Jin Sheng Liang ◽  
Yan Ding ◽  
Can Li
Keyword(s):  
Surface Tension ◽  
Water Clusters ◽  
Ph Value ◽  
Tap Water ◽  
Far Infrared ◽  
Zinc Alloy ◽  
17O Nmr ◽  
Flow Rates ◽  
Copper Zinc ◽  
Functional Ceramic

Effect of activating device on the property of tap water was studied by surface tensiometer and pH meter. The results showed that the surface tension of tap water activated by the device reduced and pH value increased. The variations of surface tension and pH value are connected with flow rates. The larger flow rate, the less variation of surface tension and pH value when at the same cycle time, however, the more variation of surface tension and pH value when at the same activating time. Activated by the device, 17O NMR half width of tap water reduced from 70.79Hz at the inlet to 60.87Hz at the outlet. Reduction of surface tension were caused by hydrogen bonds in water clusters which were weakened or broken by far-infrared radiation of functional ceramic ball and galvanic cell action of copper-zinc alloy. Increment of pH value were caused by H+ in water exchanging with metal cations on surface of far-infrared ceramic balls and dissolved oxygen getting electron and forming OH-1 with the function of copper-zinc alloy.

scholarly journals Heavy metals content in Serbian old plum brandies

2013 ◽  
Vol 78 (7) ◽  
pp. 933-945 ◽  
Author(s):  
Mirjana Bonic ◽  
Vele Tesevic ◽  
Ninoslav Nikicevic ◽  
Jelena Cvejic ◽  
Slobodan Milosavljevic ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Ph Value ◽  
Hydride Generation ◽  
Absorption Spectrometry ◽  
Atomic Spectrometry ◽  
Alcoholic Beverages ◽  
Cu Content ◽  
Lead And Cadmium ◽  
Flame Atomic Absorption ◽  
Copper Zinc

Seven elements, namely, arsenic, lead, cadmium, copper, zinc, iron and manganese were determined in 31 samples of Serbian plum brandies by applying atomic spectrometry techniques. Flame atomic absorption spectrometry was used for quantification of copper, iron, zinc, manganese, lead and cadmium; and hydride generation atomic spectrometry absorption for arsenic quantification. Measured concentrations of heavy metals and arsenic was assessed according to the Serbian regulations, official regulations of some other countries and in respect of microelements content in other similar distilled alcoholic beverages. Amounts of microelements in maximal recommended daily and weekly intake of plum brandy were determined. The influence of production (home made and industrial), type of wooden barrel (oak and mulberry), and duration of ageing process on the content of Zn, Cu, Fe and Mn in plum brandies, as well as coefficient of correlation between Cu content and pH value were also studied.

scholarly journals The content of copper, zinc, and nickel in the selected species of edible mushrooms

2018 ◽  
Vol 30 (1) ◽  
pp. 7-10
Author(s):  
Beata Kuziemska ◽  
Andrzej Wysokiński ◽  
Dawid Jaremko ◽  
Krzysztof Pakuła ◽  
Maria Popek ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
Total Content ◽  
Atomic Emission ◽  
Average Content ◽  
Suillus Luteus ◽  
Inductively Coupled ◽  
Copper And Zinc ◽  
Microwave System ◽  
Copper Zinc ◽  
Total Average

Abstract The aim of the research was to evaluate the accumulation level of copper, zinc and nickel in forest mushrooms – Bay Bolete (Xerocomus badius), Saffron Milk Cap (Lactarius deliciosus), Rough-Stemmed Bolete (Leccinum scabrum), Slippery Jack (Suillus luteus) and Parasol Mushroom (Macrolepiota procera). The analysed mushrooms were obtained from growth forests located in the Masovian Voivodeship in the following counties: Siedlce, Sokołów, Łosice and Łuków. Total content of metals was determined using the method of atomic emission spectroscopy with inductively coupled plasma, after the earlier mineralisation of materials ‘by dry combustion’ in a muffle furnace at the temperature of 450°C, and after melting of ash in a 10% solution of HCl. In the soil samples taken from the places where the tested mushrooms occur, pH in 1 mol KCl·dm-3 and total content of copper, zinc and nickel were determined by the ICP-AES method after earlier mineralization in mixture of concentration HCl and HNO3 (3:1) in a microwave system. Test results were statistically analysed with the use of software STATISTICA 12 PL (STATSOFT, TULSA, USA). The analysed mushrooms had diverse content of the determined metals. The highest total average content of copper and zinc was present in Bay Bolete: 34.83 mg ∙ kg-1d.m. for Cu and 155.50 mg ∙ kg-1d.m. for Zn, and the highest average content of nickel was contained in Rough-Stemmed Bolete – 2.98 mg ∙ kg-1d.m.. The lowest average content of copper and zinc was determined in Rough-Stemmed Bolete: 11.98 mg ∙ kg-1d.m. for Cu and 91.90 mg ∙ kg-1d.m. for Zn, and lowest total average content of nickel was present in Bay Bolete – 1.05 mg ∙ kg-1d.m. No excessive accumulation of examined heavy metals was stated in the analysed mushrooms species.

scholarly journals EFFECT OF THE ORDER OF APPLICATION OF COPPER AND ZINC COMPOUNDS ON CATALYTIC ACTIVITY IN CO-OXIDATION REACTION

2021 ◽  
pp. 173-178
Author(s):  
Ю.В. Александрова ◽  
А.Ю. Постнов ◽  
В.Н. Нараев
Keyword(s):  
Quantitative Composition ◽  
Active Components ◽  
Zinc Compounds ◽  
Co Oxidation Reaction ◽  
Copper And Zinc ◽  
Joint Application ◽  
Minimum Particle Size ◽  
Multicomponent Gas ◽  
Copper Zinc ◽  
Scope Of Application

На основе алюмохромового носителя экстракционно-пиролитическим методом (ЭПМ) синтезирована серия медь-цинк-содержащих катализаторов, проанализировано влияние порядка внесения активных компонентов (меди и цинка) на качественный и количественный состав формирующихся фаз, а также глубину размещения в гранулах носителя, структурно-прочностные и каталитические свойства образцов в процессе окисления СО кислородом воздуха.Рассчитанные значения энергии активации и предэкспоненциального множителя показали, что порядок внесения активных компонентов оказывает влияние на кинетические параметры: наилучшие результаты наблюдаются в образцах, полученных совместной пропиткой алюмохромового носителя. Константы скорости реакции окисления СО (k), рассчитанные во всем температурном диапазоне более, чем в 2 раза выше, чем при совместном внесении компонентов.С помощью электронно-зондового микроанализа изучена текстура поверхности катализаторов ЭПМ, установлено, что не смотря на порядок внесения, технология ЭПМ позволяет получать однородную текстуру - поверхность катализаторов характеризуется слоистостью с частицами чешуйчатой структуры с минимальным размером частиц во всех случаях 0,4 мкм, максимальным 3-4 мкм. Совместное внесение Zn и Cu обеспечивает равномерное распределение компонентов по сечению гранул катализаторов.Результаты работы могут быть применимы для построения технологии эффективных медь-цинковых катализаторов для процессов окисления. Область применения катализаторов – комплексная очистка многокомпонентных газовых смесей. A series of copper-zinc-containing catalysts was synthesized on the aluminum - chromium oxides base by the extraction -pyrolytic method (EPM), the effect of the order application active components (copper and zinc) on the qualitative and quantitative composition of the formed phases, as well as the depth of placement in the granules of the baser, structural strength and catalytic properties of samples during oxidation with air oxygen was analyzed.The calculated values of the activation energy and the pre-exponential multiplier showed that the order of application active components has an effect on the kinetic parameters: the best results are observed in samples obtained by joint impregnation of an alumochrome carrier. The rate constants oxidation CO (k) calculated over the entire temperature range are more than 2 times higher when the components added together.Using electron probe microanalysis, the surface texture of the EPM catalysts was studied, it was found that, despite the order of application, the EPM technology allows to obtain a homogeneous texture - the surface of the catalysts is characterized by layering with particles of a scaly structure with a minimum particle size of 0.4 microns in all cases, and maximum 3-4 microns. The joint application of Zn and Cu ensures an even distribution of the components over the cross section of the catalyst granules.The results of the work can be applied to build a technology of effective copper-zinc catalysts for oxidation processes. The scope of application of catalysts is complex purification of multicomponent gas mixtures.

scholarly journals Changes in the Composition of the Soil Bacterial Community in Heavy Metal-Contaminated Farmland

2021 ◽  
Vol 18 (16) ◽  
pp. 8661
Author(s):  
Shu-chun Tseng ◽  
Chih-ming Liang ◽  
Taipau Chia ◽  
Shan-shin Ton
Keyword(s):  
Heavy Metal ◽  
Bacterial Community ◽  
Structural Changes ◽  
Ph Value ◽  
Deep Layer ◽  
Soil Bacterial Community ◽  
Rrna Gene ◽  
Zinc Tolerance ◽  
Copper And Zinc ◽  
Soil Bacterial

The structural changes of microorganisms in soil are the focus of soil indicators research. The purpose of this study was to investigate the changes in the composition of the soil bacterial community in heavy metal-contaminated soil. A total of six soil samples (two sampling times) were collected from contaminated farmland at three different depths (surface, middle, and deep layer). The pH value was measured. The concentrations of heavy metals (Cr, Ni, Cu, Zn, Cd, and Pb) and the soil bacterial community were analyzed using ICP-OES and 16S rRNA gene sequencing. The results of the two samplings showed that the pH value in the deep layer decreased from 6.88 to 6.23, and the concentrations of Cu, Zn, Cd, and Pb, with a smaller ion radius, increased by 16–28%, and Shannon, Chao1 increased by ~13%. The bacteria community composition at the three depths changed, but Proteobacteria, Acidobacteria, and Actinobacteria were the dominant phyla. In the copper and zinc tolerance test, the isolated bacterium that was able to tolerate copper and zinc was Bacillus sp. We found that, the longer the heavy metal pollution was of concern, the higher the tolerance. These results can be used as references for the microbial remediation of heavy metal-contaminated farmland.

scholarly journals Copper-To-Zinc Ratio as an Inflammatory Marker in Patients with Sickle Cell Disease

Sci ◽  
2020 ◽  
Vol 2 (4) ◽  
pp. 89
Author(s):  
Mathias Abiodun Emokpae ◽  
Emmanuel Bamidele Fatimehin
Keyword(s):  
Sickle Cell Disease ◽  
Sickle Cell ◽  
Serum Levels ◽  
Serum Copper ◽  
The Body ◽  
Zinc Homeostasis ◽  
Clinical State ◽  
Cell Disease ◽  
Copper And Zinc ◽  
Copper Zinc

Sickle cell disease (SCD) is an inherited disorder and a major health challenge in Nigeria. Micronutrient deficiencies often associated with the disorder may cause inflammation and abnormal metabolism in the body. The copper-to-zinc ratio is a more relevant diagnostic measure than the concentration of either metal alone in clinical practice. This study seeks to evaluate serum levels of c-reactive protein (CRP), copper, zinc and the copper-to-zinc ratio, and to correlate the latter with CRP in adult subjects with SCD. Serum copper, zinc, CRP and plasma fibrinogen were assayed in 100 confirmed SCD patients in steady clinical state and 100 age- and sex-matched subjects with normal hemoglobin. Serum copper and zinc were assayed by the colorimetric method using reagents supplied by Centronic, Germany, while CRP and fibrinogen were assayed using reagents supplied by Sigma (St. Louis, MO, USA) and Anogen (Ontario, Canada), respectively. The copper-to-zinc ratio was calculated from serum levels of copper and zinc. The measured parameters were compared between the groups using the Students t-test, and the Pearson correlation coefficient was used to relate CRP with the other parameters. Serum copper, CRP, fibrinogen and the copper-to-zinc ratio were significantly higher (p < 0.001), while zinc level was lower in SCD patients than in controls. Serum CRP concentration correlated with copper (r = 0.10; p < 0.02), zinc (r = −0.199; p < 0.05) and the copper-to-zinc ratio (r = 0.312; p < 0.002), but the correlation between CRP and fibrinogen was not significant. Inflammation may modulate copper and zinc homeostasis, and the copper-to-zinc ratio may be used as a marker of nutritional deficiency and inflammation in SCD patients.

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