锌重对高强GI板点焊工艺窗口的影响

点焊工艺窗口是评价汽车板电阻点焊工艺适应性的重要指标,镀锌汽车板由于镀层的存在对点焊工艺具有较大的影响。采用试验和数值模拟手段研究高强GI汽车板锌层重量与点焊窗口之间的关系,结果表明,在其他条件不变的情况下,随着锌层质量增加,点焊工艺窗口显著降低。研究结果对合理制定GI高强钢点焊工艺具有一定的指导意义。

利用锌浮渣重选尾矿制取活性氧化锌的研究

利用锌浮渣重选尾矿,硫酸浸出高温氧化除杂,碳酸氢氨中和沉降、干燥、煅烧,研制生产橡胶制品添加剂碱式碳酸锌与活性氧化锌。

镀锌钢板重卷自动控制产能提升研究与改造对策

本文以广州某钢厂镀锌钢板重卷线为研究对象,重点介绍该生产线自动控制系统,主要从生产线的产能提升入手,从研究技术方案制定、自动控制技术改造以及关键技术的实施等多方面进行详细的阐述。对该生产线在自动控制系统方面存在的缺陷提出整改措施。通过技术整改解决系统存在的问题,同时为生产线速度提升奠定坚实的技术基础。技术改造大大提高了生产效率,取得很好的效果。

锌基重防腐复合涂层的设计及应用

本文介绍了一种锌基重防腐复合涂层防护技术,该防护技术采用锌基重防腐粉末涂料作为底涂,结合热喷涂金属层对钢结构件边角的保护,外层采用功能性粉末涂料涂层形成复合保护,替代传统热浸镀锌+喷塑工艺。采用该防护技术的复合涂层的高速公路护栏产品质量优良,5年来取得了较好的应用效果,表明该防护技术具有良好的发展推广前景。

锌基重防腐+纯聚酯双涂层高速公路护栏防护技术

锌基重防腐＋纯聚酯双涂层技术是指用静电涂装法在高速公路护栏钢铁基材上,喷涂锌基重防腐粉末涂料层和纯聚酯粉末涂料层,形成双层防护体系。并且阐述该项技术的作用原理以及良好的适用性。

浅析镀锌线带钢重卷线

以浦项在广东顺德建立的连续镀锌线为例，详细介绍了带钢重卷线的主体设备以及相关设备参数．并对其工艺做出简要说明。

内蒙某复杂铜铅锌硫化矿选矿工艺研究

内蒙某矿业公司的复杂铜铅锌硫化矿石铜、铅、锌矿物共生关系非常密切而复杂,给选矿造成极大难度。为了给该矿石的开发提供可行方案,进行了多方案的详细选矿试验,结果表明,常规浮选工艺无法有效分选该矿石,而采用铅重选—铜锌混合浮选再分离浮选的工艺流程,可以获得铅品位为57.20%、铅回收率为54.18%的铅精矿,铜品位为13.35%、铜回收率为57.11%的铜精矿和含锌18.78%、锌回收率为41.94%的富锌物料,富锌物料可以与公司其他选厂锌品位较高的锌精矿搭配销售。

西藏甲玛铜铅锌银钼多金属矿选矿试验研究

针对西藏甲玛铜铅锌银钼多金属原矿进行选矿小型试验研究。对矿区铜铅锌矿石分别采用铜钼混浮-铜钼混精分离工艺流程、优先浮铜-铅锌混浮-铅锌重选分离工艺流程、优先浮铜-铅锌混浮工艺流程,获得合格的铜精矿、钼精矿、铅精矿和铅锌混合精矿,实现了铜、铅、锌、钼、银金属的综合回收利用。

无取向电工钢用M11含铬绝缘涂层的研制

介绍了马钢无取向电工钢用M11含铬绝缘涂层的开发过程及工艺流程。并对其性能进行了检测分析,结果表明,M11含铬绝缘涂料是一种主要由丙烯酸树脂乳液、重铬酸锌水溶液、硼酸、甘油等组成的半有机涂料,其性能满足电工钢连续退火生产线高速辊涂的需要;通过涂层工艺的合理控制,M11含铬绝缘涂层,其层间电阻在150Ω.mm2/片以上,综合性能满足电工钢用户的需要。

Effects of Red Mud on the Remediation of Pb, Zn and Cd in Heavy Metal Contaminated Paddy Soil

[Objective] To study the remediation efficiency of red mud on Pb, Zn and Cd in the heavy metal contaminated paddy soil of mine area, to clarify its remediation mechanism and fertilizer efficiency on heavy metal contaminated soil. [Method] The soil incubation experiment was conducted to study the effect of red mud on the pH values and electrical conductivity （EC）, and the remediation efficiency of red mud on lead （Pb）, zinc （Zn） and cadmium （Cd） in heavy metal contaminated soil. [Result] Red mud addition reduced the content of exchangeable Pb, Zn and Cd in the soil significantly. Compared with the control, when incubated for 30, 60 and 90 d with the red mud dosage of 4% （W/W）, the exchangeable Pb content was decreased by 39.25%, 41.38% and 50.19%; exchangeable Zn content was decreased by 49.26%, 57.32% and 47.16%; and exchangeable Cd content was decreased by 19.53%, 24.06% and 25.70%, respectively. The application of red mud had significant impact on the share of Pb, Zn and Cd contents in five forms, and different amounts of red mud application all reduced the proportion of exchangeable Pb, Zn and Cd to the total Pb, Zn and Cd. In addition, the proportion of exchangeable Pb, Zn and Cd to total Pb, Zn and Cd decreased with the increasing amount of red mud addition. [Conclusion] The study provided references for reasonable application of red mud and reduction of heavy metal pollution in paddy soil.

Effects of Spraying Nitrogen and Zinc Fertilizers after Flowering on Grain Weight and Nutritional Quality of Winter Wheat

In order to explore the effect of spraying fertilizers after flowering on grain weight and nutritional quality of different winter wheat cultivars, twenty wheat culti- vars in wheat zones along Yellow River and Huai River, were used to investigate the change of thousand kernel weight （TKW）, phytic acid content （PAC）, contents of Fe, Zn and Mg and bioavailability by spraying zinc and nitrogen fertilizers after flowering. The results showed that both of TKW and protein content in grains in- creased by spraying Zn and N fertilizers, and the effect of N fertilizer proved more significant. The PAC decreased significantly after Zn treatment, for example, PAC of ＂955159＂, a wheat cultivar, decreased by 27.95%. However, PAC was in- significantly influenced by N fertilizer. On the other hand, Zn content in wheat grains were improved after spraying Zn fertilizer and the increase aveaged 54.38%. Furthermore, Fe and Zn contents grew significantly after spraying N fertilizer, and the increase averaged 36.88% and 11.25% respectively. However, Mg content in grains declined by N fertilizer. Still, the bioavailability of zinc in grains was enhanced after spraying Zn fertilizer, and of Fe was also increased greatly after spraying N fertilizer. In conclusion, grain weight, and content and effectiveness of mineral ele-ments can be improved simultaneously by rational spraying of N and Zn fertilizers to improve quality of grains.

Overlapped peaks resolution for linear sweep polarography using Gaussian-like distribution

A resolution method based on Gaussian-like distribution for overlapped linear sweep polarographic peaks was proposed to simultaneously detect the polymetallic components, such as Zn（Ⅱ） and Co（Ⅱ）, coexisting in the leaching solution of zinc hydrometallurgy. A Gaussian-like distribution was constructed as the sub-model of overlapped peaks by analyzing the characteristics of linear sweep polarographic curve. Then, the abscissas of each peak and trough were pinpointed through multi-resolution wavelet decomposition, the curve and its derivative curves were fitted by using nonlinear weighted least squares （NWLS）. Finally, overlapped peaks were resolved into independent sub-peaks based on fitted reconstruction parameters. The experimental results show that the relative error of half-wave potential pinpointed by multi-resolution wavelet decomposition is less than 1% and the accuracy of Ip fitted by NWLS is higher than 96%. The proposed resolution method is effective for overlapped linear sweep polarographic peaks of Zn（Ⅱ） and Co（Ⅱ）.

Copper and Zinc Enrichment in Different Size Fractions of Organic Matter from Polluted Soils

Bioavailability of heavy metals in soil organic matter depends on itscomponents. Characterization of heavy metal distributions in different fractions of soil organicmatter is needed for better understanding of the fate of heavy metals. This study investigated theaccumulation and partitioning of copper and zinc among different size particulate organic matter(POM) fractions in polluted soils from a former iron ore processing site in western Shaoxing County,Zhejiang Province. Physical fractionations were carried out to separate soil primary particlesaccording to their size and density. Copper and Zn had a heterogeneous distribution among soilparticle fractions. Copper and Zn were significantly (p < 0.05) enriched in the POM fractions. >0.05 mm POM and < 0.05 mm fine soil fractions were mainly responsible for Cu and Zn retention insoils. The POM fraction contained up to 1 322 mg Cu kg^(-1) and 1115 mg Zn kg^(-1) and the fine soilfraction contained up to 422 mg Cu kg^(-1) and 537 mg Zn kg^(-1). The total POM fraction wasresponsible for 15.8%-41.2% and 12.2%-31.7% of the total amount of Cu and Zn, respectively, in thepolluted soils. The percentages of Cu and Zn associated with organic matter in < 0.05 mm fine soilfractions for the polluted soils ranged from 14.1% to 24.5%, and 5.4% to 15.8%, respectively.Accumulation of soil organic matter could increase enrichment of Cu (or Zn) in the POM fractions.Also, Cu provided a greater enrichment in the POM fractions than Zn.

Effect of Amendments on Growth and Element Uptake of Pakchoi in a Cadmium, Zinc and Lead Contaminated Soil

A pot experiment was carried out to study the effects of two amendments, limeand calcium magnesium phosphate, on the growth and Cd, Pb, Zn, Cu, Mu, Fe, N, P and K uptake ofpakchoi (Brassica chinensis) in a Cd, Pb and Zn polluted acid soil in the southern part of China.The growth of pakchoi was apparently improved by lime and calcium magnesium phosphate application,the uptake of Cd, Pb, Cu and Zn by pakchoi was significantly depressed and the symptom caused byheavy metals pollution was eliminated. Meanwhile, the absorption of N, K and Mn was also inhibitedby these amendments. Soil pH was the main factor controlling the uptake of the heavy metals bypakchoi. This suggests that lime and calcium magnesium phosphate could be used as effectiveamendments for eliminating the toxicity of heavy metals to the vegetable and inhibiting theirabsorption by the crop.

高速公路旧波形梁板涂装再利用工艺

介绍了高速公路旧波形梁护栏常用的几种修复工艺及效果以及一种新型的涂装再利用工艺,即通过涂装锌基重防腐复合涂层提高修复后护栏产品的防腐能力,该涂装再利用工艺具有良好的应用效果和推广前景。

Effect of Heavy Metal Pollution on Potassium Behavior in Typic Udic Ferrisol

The indirect influence of heavy metal contamination of soil on nutrient availability, an important aspect of soil quality, may need to be taken into consideration when determining overall effects of heavy metals. A laboratory experiment was performed to study the effects of combined pollution of Cu, Ph, Zn and Cd on soil K status as indicated by chemical fractions, adsorption-desorption and quantity/intensity (Q/I) relationship of K in a Typic Udic Ferrisol (generally called red soil), by employing uniform design and single factor design. Compared to the control, content of exchangeable K was decreased, but that of soluble K increased in the samples contaminated with heavy metals. Due to heavy metal pollution, potassium adsorption was reduced by 5% to 22%, whereas the desorption percentage of adsorbed K increased by 2% to 32%. The Q/I curves shifted downward, potassium buffering capacity (PBCK) decreased, and equilibrium activity ratio values (ARoK) increased with increasing heavy metal pollution. These influences followed the sequences of Ph>Cu>Zn and combined pollution>single one. Displacement of K from canon exchange sites and decrease in soil CEC due to heavy metals should be responsible for the changes of soil K behaviours. The findings suggest that heavy metal pollution of soil might aggravate the degradation of soil K fertility by decreasing K adsorption and buffering capacity and increasing desorption.

Effect of Heavy Metals on Phosphorus Retention by Typic Udic Ferrisols: Equilibrium and Kinetics

A study was conducted to examine the effect of heavy metals (Cu,Pb, Zn and Cd in combination or alone) on the equilibrium andkinetics of phosphorus (P) retention in typic udic ferrisols by usingboth equilibrium and flow techniques. Fourteen soil samples withvarying artificial contamination of Cu, Pb, Zn and Cd were prepared.Heavy metal pollution led to increases in retention capacity andmaximum buffering capacity (MBC) of soil P. The rate of P retentionwas also increased and the time to reach equilibrium was advanced byheavy metals addition.

Research on the Performance of Listed Companies＇ Bankruptcy Reorganization -Taking HULUDAO ZINC INDUSTRY CO.,LTD. as an Example

Bankruptcy Reorganization is a legal system to regenerate enterprises that meet the requirements of bankruptcy but have the ability to survive. Since the implementation of Bankruptcy law in 2007？to the end of 2016, there are already 75 listed companies in the bankruptcy reorganization process to rectify the operation. Bankruptcy Reorganization is becoming an important way for some enterprises to get rid of their difficulties. However, whether the enterprises after the bankruptcy reorganization can really get reborn is worth further study. This article uses HULUDAO ZINC INDUSTRY CO.,LTD. as an example, examines the financial performance and market performance of the company before and after the bankruptcy reorganization, and verifies the effect of the bankruptcy reorganization system in order to provide guidance and suggestions for improving the system of bankruptcy reorganization of the listed companies.

Probing the catalytic behavior of ZnO nanowire supported Pd_1 single-atom catalyst for selected reactions

We have dispersed individual Pd atoms onto ZnO nanowires(NWs)as single‐atom catalysts(SACs)and evaluated their catalytic performance for several selected catalytic reactions.The Pd1/ZnO SAC is highly active,stable,and selective towards CO2for steam reforming of methanol to produce hydrogen.This catalyst system is active for oxidation of CO and H2but performs poorly for preferential oxidation of CO in hydrogen‐rich stream primarily due to the strong competitive oxidation of H2on ZnO supported Pd1atoms.At ambient pressure,reverse water‐gas‐shift reaction occurs on the Pd1/ZnO SAC.This series of tests of catalytic reactions clearly demonstrate the importance of selecting the appropriate metal and support to develop SACs for catalytic transformation of molecules.