浅议从炼铜电收尘烟灰中综合回收有价金属

介绍了从炼铜电收尘烟灰中回收铜、锌、镉、铟、铅、铋,富集金银的工艺流程、冶金原理、操作条件和主要技术指标。     

浅议从炼铜电收尘烟灰中综合回收有价金属

介绍了从炼铜电收尘烟灰中回收铜、锌、镉、铟、铅、铋，富集金银的工艺流程、冶金原理、操作条件和主要技术指标。     

铜转炉电收尘烟灰的综合利用

我公司冶炼厂炼铜转炉电收尘烟灰日产量为1.1吨左右。其成分为(％):Cu4,Zn8～10,Cd0.6～0.8,Pb10～12,Bi6～8。对这种转炉烟灰的综合利用进行了多年的研究,于1971年投入工业生产,综合回收了Cu、Zn、Cd、Bi、Pb。几年来的生产实践结果表明,采用本工艺流程处理铜转炉的电收尘烟灰是可行的。     

铜冶炼电收尘烟灰综合回收工艺

对电收尘烟灰进行二段氧化酸浸萃取反萃电积的原则工艺流程试验研究,控制浸出体系的氧化还原电位为0.5～2V,考察了反应过程中温度、pH值、液固比、试剂浓度等因素对反应效果的影响,控制反应温度为75℃、pH值为3～4、液固比为4∶1、浸出3.5h时,铜、锌、砷浸出率可以达到92.5%、91.6%、90.8%;并考察了砷的资源化走向,提出了结合熔池熔炼工艺综合回收浸出渣的工艺路线;消除了电收尘烟灰在堆存过程中对环境造成的严重污染隐患。     

用炼铜烟灰生产七水硫酸锌

介绍了白银公司炼铜厂利用转炉电收尘烟灰生产七水硫酸锌的工艺流程及主要工序操作的技术条件。     

低速密相气力输送技术在电收尘烟灰输送中的应用

介绍低速密相气力输送技术在诺兰达电收尘烟灰输送中的应用情况,指出了存在的问题,提出了改进措施.     

低速密相气力输送技术在电收尘烟灰输送中的应用

介绍低速密相气力输送技术在诺兰达电收尘烟灰输送中的应用情况,指出了存在的问题,提出了改进措施。     

电收尘烟灰输送泵配置方案投资分析

文章介绍了电收尘烟灰气力输送泵的几种配置方案，并对各种方案进行了投资分析比较，最后提出了改进设计、减少投资的措施。     

电收尘烟灰输送泵配置方案投资分析

文章介绍了电收尘烟灰气力输送泵的几种配置方案，并对各种方案进行了投资分析比较，最后提出了改进设计、减少投资的措施。     

从铅锌烧结电收尘烟灰中提取镉

重点介绍从三冶炼厂铅锌烧结电收尘烟灰中提取镉的工业试验过程及结果，为铅锌冶炼统中的氧化物料处理提供了新方法。     

Kinetics of biochemical leaching of sphalerite concentrate

The paper deals with bacterial leaching of sphalerite. The data include progress curves for leaching of the concentrate in terms of Zn, Cu, and Cd solubilization. Plots of the Zn and Cu data followed a relationship predicted by a chemical rate equation. Reaction rates for Zn and Cu were inversely related to initial particle size of the concentrate. A pulp density in excess of 2 pct caused a decrease in percent Zn leached in 31 days, presumably due to oxygen limitation. The leaching of Zn and Cu followed first order kinetics.     

层错能对高能球磨铜合金的影响

试验中以球磨的方法制备了一系列不同成份的Cu—Zn及Cu—Al合金（层错能〈75MJ／m^2）。对Zn和Al的固溶强化效果及其降低铜合金层错能的作用进行了研究。实验结果显示,随着Zn或Al含量的升高,（试样的）显微硬度（HV）值增加,符合固溶强化的规律。在相近原子百分比的条件下比较Cu—Zn和Cu—Al合金的HV值,显示当合金中无第二相出现时,Zn的固溶强化效果优于Al;另一方面,随着Zn％及Al％（原子百分比）的增加,Cu～Zn及Cu—Al合金的层错能下降,而层错能的降低导致了强化的产生,这种情况下Zn和Al的不同强,L化效果可以用公式k=Gb/2π（1-v）（a-δ·FE）^[1]来评价,式中K是Hall—Petch关系的斜率。评价的结果与实验数据（合金的显微硬度值）是相吻合的。     

Constitutive overexpression of Cu/Zn superoxide dismutase exacerbates kainic acid-induced apoptosis of transgenic-Cu/Zn superoxide dismutase neurons

Cu/Zn superoxide dismutase (Cu/Zn SOD) is a key enzyme in the metabolism of oxygen free radicals. The gene resides on chromosome 21 and is overexpressed in patients with Down syndrome. Cultured neurons of transgenic Cu/Zn SOD (Tg-Cu/Zn SOD) mice with elevated activity of Cu/Zn SOD were used to determine whether constitutive overexpression of Cu/Zn SOD creates an indigenous oxidative stress that predisposes the Tg-Cu/Zn SOD neurons to added insults. Neurons from three independently derived Tg-Cu/Zn SOD strains showed higher susceptibility than nontransgenic neurons to kainic acid (KA)-mediated excitotoxicity, reflected by an earlier onset and enhanced apoptotic cell death. This higher susceptibility of transgenic neurons to KA-mediated apoptosis was associated with a chronic prooxidant state that was manifested by reduced levels of cellular glutathione and altered [Ca2+]i homeostasis. The data are compatible with the thesis that overexpression of Cu/Zn SOD creates chronic oxidative stress in the transgenic neurons, which exacerbates their susceptibility to additional insults such as KA-mediated excitotoxicity.     

Advantages and disadvantages of various access routes in sonographic diagnosis of dysplasia and luxation in the infant hip

Changes in copper concentration in the arterial wall are important because of cross-linkage formation in collagen and elastin. The breakdown of the elastic layer is characteristic for aneurysm and is affected by the abnormalities in copper metabolism. This study was undertaken to evaluate Ca, Mg, Zn and Cu concentrations and their relationships in the arterial wall, serum and calcified plaque in atherosclerosis obliterans (AO) and abdominal aortic aneurysm (AA). Samples of the aorta wall were obtained at the endarterectomy in AO and the vascular reconstruction in AA. Elements were determined by means of atomic absorption spectrometry. Serum concentrations of Zn and Cu were higher and that of Ca lower in AO as compared to AA and the controls. Arterial concentrations of Zn, Cu and Mg were higher in AO as compared to AA. The ratios of element concentrations in serum (Ca/Mg, Ca/Zn and Mg/Cu) were higher in serum in AA than in AO. Positive correlations were calculated for Ca and Mg (r > or = 0.74), Ca and Zn (r > or = 0.73), Mg and Zn (r > or = 0.90) in the arterial wall in AO and AA. Low but significant correlation was calculated for Cu concentrations between serum and the arterial wall in AA (r = 0.43). Concentrations of Ca, Mg, Zn and Cu were higher in plaque than in the surrounding tissue. The results indicate differences in arterial and serum concentrations of Ca, Mg, Zn and Cu between AO and AA and the accumulation of these elements in the plaque rather than in the surrounding vascular tissue.     

Placental copper transport in rats: effects of elevated dietary zinc on fetal copper, iron and metallothionein

We hypothesized that the competition between zinc (Zn) and copper (Cu) during fetal accretion of copper could be discriminated at either the dam-to-placenta or placenta-to-fetus stage. This premise was tested by feeding dams a high Zn diet (1000 mg/kg, HZn) during the second half of gestation. One day before delivery, dams were anesthetized, fetuses removed and both maternal and fetal tissues and plasma obtained and assayed. Other rats were fed a normal Zn concentration diet (32.4 mg/kg, ND) throughout pregnancy. There were significantly lower fetal liver Cu concentrations and greater plasma Fe concentrations, but not plasma Cu concentrations or liver Fe concentrations in the HZn group. Both dam and fetal Zn liver concentrations were greater in the HZn than in the ND group. Plasma Cu levels were lower in the HZn-fed than in the ND-fed dams. Placental tissue from the HZn litters had a greater concentration of Zn and Fe than did the ND group, whereas no effect was noted for Cu concentration. Metallothionein (MT) levels were elevated in dam livers and placenta in the HZn group, but there were no differences in fetal liver MT. The dynamic assessment of placental transport was conducted by injecting 2.5 mg/kg Cu acetate intravenously into dams of both groups. Sequential samplings of dam and fetal blood and placentas were taken from 0 to 60 min. After the Cu bolus, there was a consistently higher plasma Cu concentration in the HZn than in the ND dams, but no alteration in the concentration of Cu in the placenta or fetal plasma. This study indicates that placental Cu uptake is not affected by a high Zn diet in the dam. In addition, the greater Zn concentration in the placenta of HZn than in ND litters results in abnormal fetal Cu, Fe and Zn concentrations, suggesting that an imbalanced maternal mineral consumption is deleterious to normal divalent metal accretion.     

Effect of dietary zinc levels on health and productivity of gilts and sows through two parities

The influence of 0, 50, 500 or 5,000 ppm supplemental Zn on productive characteristics, weight change, and serum and organ mineral concentrations of 60 crossbred and purebred Yorkshire gilts was evaluated. Gilts were fed their respective treatment from 30 kg body weight until the completion of two parities. Sows fed 5,000 ppm supplemental Zn weighed significantly less than sows from the other treatments when killed. Serum alkaline phosphatase activity was higher for the sows fed the highest level of Zn in all replications at 10 and 14 mo of age than for sows from the other treatments. Sows fed 0, 50 or 500 ppm had lower serum Zn and higher serum Cu concentrations than sows fed 5,000 ppm Zn at 10 and 14 mo of age. The number of pigs farrowed (total and live) and birth weight were not affected by dam's dietary treatment. However, sows receiving no additional Zn had a higher number of abnormal pigs/litter than sows on the other treatments. Sows fed 5,000 ppm additional Zn weaned fewer pigs that weighed less at weaning than sows on the other treatments. The concentration of Zn in the sow's liver increased significantly and liver Cu decreased as dietary level of Zn increased. Sows receiving 5,000 ppm Zn had lower hepatic Fe stores compared with sows receiving 500 ppm Zn. Elevated renal Cu and Zn concentrations were found in sows fed the highest level of Zn supplementation. The Zn concentration was higher and the Cu concentration lower in the aorta of sows fed 5,000 ppm Zn compared with sows fed 0 or 50 ppm additional Zn. Incidence of osteochondrosis was higher in sows supplemented with 5,000 ppm Zn than for sows from the other treatments.     

Metallothionein expression and concentrations of copper and zinc are associated with tumor differentiation in hepatocellular carcinoma

Metallothionein is the carrier protein of heavy metal ions, such as copper (Cu) and zinc (Zn). In this study, the relationships among immunohistochemical expression of metallothionein, concentrations of Cu and Zn, histological differentiation and proliferative activity of hepatocellular carcinoma were investigated in 51 cases. The concentrations of Cu and Zn in both tumor and non-tumor tissues were determined using electron probe microanalysis. Immunohistochemical expression of metallothionein in tumor tissues decreased with the degree of differentiation, whereas the number of hepatocytes positive for Ki-67 increased. Furthermore, the concentrations of Cu and Zn in tumor tissues decreased with the degree of histological differentiation in human hepatocellular carcinoma.     

A multi-element isotopic tracer assessment of true fractional absorption of minerals from formula with additives of calcium, phosphorus, zinc, copper and iron in young piglets

True fractional absorption of minerals was measured to determine the bioavailability of Zn, Fe, Mn and Se from liquid formulas fortified with stepwise additions of Ca and P (as Ca glycerophosphate and carbonate, Ca*P), and Zn, Cu and Fe (as sulfate salts). Growth, deposition of tracers in organs and bone mineral content of femurs as assessed by single photon absorptiometry were measured. Four-day-old piglets (n = 36) were randomly assigned to groups fed a basal diet or additions of Ca*P (Ca = 25, P = 18 g/kg dry diet), Ca*P+Zn (Zn = 0.04 g/kg), Ca*P+Zn+Cu (Cu = 0.007 g/kg) or Ca*P+Zn+Cu+Fe (Fe = 0.008 g/kg). Oral and intravenous administration of extrinsic isotopes of 59Fe, 54Mn, 65Zn, 75Se and 47Ca was followed by fecal monitoring for 15 d and true absorption calculated after accounting for endogenous excretion. Addition of Ca*P+Zn reduced Zn absorption (P < 0.05) and Ca*P+Zn+Cu reduced Fe absorption (P < 0.01), but Mn and Se absorptions were not altered. Uptake of only Zn tracer into heart was significantly different (P < 0.05) among diet groups. Weight gain and linear growth were similar in all groups. Addition of Ca*P produced higher bone mineral density, but its effect on Zn absorption warrants further investigation.     

The use of ground mollusks in the evaluation of environmental pollution with heavy metals in the city of Ufa]

The authors analyzed soil and cochleae of bush snails in Ufa for heavy metals (Zn, Cu, Pb, Cd) content. Zn and Cu content of the soil exceeds the background levels and approaches the MACs. Pb and Cd content corresponds to their usual content of soil. The coefficients of Zn, Cu, Pb and Cd pass from soil to cochleae of bush snails increase in the row Pb < Zn < Cu < Cd and never outnumber 1.     

Feasibility of Estimating Heavy Metal Contaminations in Floodplain Soils Using Laboratory-Based Hyperspectral Data—A Case Study Along Le'an River,China

It is necessary to estimate heavy metal concentrations within soils for understanding heavy metal contaminations and for keeping the sustainable developments of ecosystems. This study, with the floodplain along Le'an River and its two branches in Jiangxi Province of China as a case study, aimed to explore the feasibility of estimating concentrations of heavy metal lead (Pb), copper (Cu)and zinc (Zn) within soils using laboratory-based hyperspectral data. Thirty soil samples were collected, and their hyperspectral data,soil organic matters and Pb, Cu and Zn concentrations were measured in the laboratory. The potential relations among hyperspectral data, soil organic matter and Pb, Cu and Zn concentrations were explored and further used to estimate Pb, Cu and Zn concentrations from hyperspectral data with soil organic matter as a bridge. The results showed that the ratio of the first-order derivatives of spectral absorbance at wavelengths 624 and 564 nm could explain 52% of the variation of soil organic matter; the soil organic matter could explain 59%, 51% and 50% of the variation of Pb, Cu and Zn concentrations with estimated standard errors of 1.41, 48.27 and 45.15mg·kg-1;and the absolute estimation errors were 8%-56%,12%-118% and 2%-22%,and 50%,67% and 100% of them were less than 25% Pb, Cu and Zn concentration estimations. We concluded that the laboratory-based hyperspectral data hold potentials in estimating concentrations of heavy metal Pb, Cu and Zn in soils. More sampling points or other potential linear and non-linear regression methods should be used for improving the stabilities and accuracies of the estimation models.