某白钨矿浮选试验研究

某石英脉型白钨矿采用重选生产工艺选别指标不理想,经分析,针对性地进行浮选工艺试验,通过比较多种技术参数条件下的试验结果,选择最佳试验参数进行浮选工艺闭路试验,实现了铜、钨的综合回收,获得白钨精矿含WO368.65%、WO3回收率84.75%的较好指标.     

提高新宝力格稀土选矿厂生产水平的研究

通过对新宝力格稀土选矿厂优先浮选工艺的试验和生产数据的分析，研究了提高生产水平的途径。结果表明，降低磨矿细度（－２００目含量为９１％－９３％）、适当提高浮选深度（４５％）、提高原矿入选品位，实行轻抑制轻捕收药剂制度以及合理控制稀土精矿品位是选矿厂生产水平的有效途径。     

新疆某矿山浮选试验研究

针对新疆某黄金矿山的矿石性质变化造成现有的浮选药剂与矿石性质不匹配,导致生产指标失稳,使得金的回收率产生较大波动的问题,进行了合理的实验室试验和全流程闭路试验。根据矿石的工艺矿物学特征,以传统的硫化矿浮选工艺为基础,采用富硫化物的方法辅之高效的浮选药剂,提高了硫化矿中的有价成分金的回收率。在实验室条件试验的基础上确定了合理的工艺流程、浮选药剂和浮选时间,品位为6.5×10^-6的原矿金回收率由原来的84%提高到90%,浮选金精矿品位为60×10^-6,尾矿为0.4×10^-6。在原矿品位和精矿品位不变的条件下,实验工艺流程更环保,浮选时间更合理,回收率更高,为企业创造了可观的经济效益,同时也节约了资源。     

新型浮选药剂B130浮选铜绿山难选氧化铜矿石试验研究

本文研究了新型选矿药剂B130浮选大冶铜绿山氧化铜矿。小型试验,工业试验和工业试验结果表明,B130不但能较大幅度提高氧化铜矿浮选指标,且还有利于金、银的回收。     

某大型金矿原生矿石选冶工艺研究

本文给出了一大型金矿原生矿选冶试验研究结果。着重研究了浮选—精矿氰化(—浸渣浮选)流程,并进行了扩大连续试验,试验结果已作为建厂设计依据。     

消除矿泥对汤丹难选氧化铜矿浮选影响的研究进展

基于汤丹矿泥的组成和浮选特性针对矿泥对汤丹难选氧化铜矿的影响进行了长时间的试验研究,主要是通过寻找新的浮选药剂及符合新药剂特性的浮选工艺,使浮选指标获得了改善。     

柿竹园低品位复杂萤石浮选工艺研究

柿竹园低品位复杂萤石的浮选工艺研究一直处于试验阶段,指标不稳定。该研究从预先筛分方向进行试验,采用直接浮选工艺,结合中矿集中处理、精矿强磁脱杂,为柿竹园萤石选别工艺选择提供了新思路。     

贵溪鲍家矿业公司选别工艺改造实践

根据原矿的矿物特性,在试验研究的基础上,将原混合浮选工艺改造成优先浮选工艺,产出了合格的单一铅、锌精矿产品,从而调整了产品结构,取得了较好的选矿技术指标,公司新增经济效益明显.     

球磨返砂尼尔森机试验研究

在现有浮选工艺中,利用尼尔森机通过重浮联合工艺,在选别现场进行球磨机返砂试验,试验证明,与单一浮选回收相比,伴生金回收率增加1．7个百分点。     

某金矿石浮选-硫脲炭浸综合回收金银铜硫的工艺试验研究

阐述了采用浮选－－硫脲炭浸一步法处理铜硫砷含量高的某难选金矿石的工艺。工艺的试验结果体现了联合流程处理难选金矿石的优势。     

On the Role of High Amounts of Mn Element in CdS Structure

CdS and MnS are technologically important semiconducting materials. In this work, due to the limited ability of these materials separately, a detailed characterization of the new samples formed by the combined use of them has been reported. CdS films, with the incorporation of Mn in a wide range of concentrations, have been produced by a low-cost Ultrasonic Spray Pyrolysis set-up. Spectroscopic Ellipsometry (SE) has been used to determine the thicknesses and optical constants (n, k) of the samples. It has been determined that samples with high amounts of Mn have lower refractive index values. Absorbance spectra have shown additional band edges along with the one belonging to CdS, for samples with Mn concentrations higher than 50 pct. This has been attributed to a phase separation above this limit. Raman spectroscopy analysis which shows additional Raman peaks belonging to MnS phase also supports these findings. Depending on this phase separation, crystalline structure has been deteriorated. Surface properties of the samples have been investigated by SEM and AFM. Elemental analysis has been performed by EDS. Resistivity measurements performed by a four-probe set-up have shown that samples containing high amount of Mn have lower electrical resistivity values.

     

Generation of an anti-tumour immune response in a non-immunogenic tumour: HSVtk killing in vivo stimulates a mononuclear cell infiltrate and a Th1-like profile of intratumoural cytokine expression

A simple gas chromatographic system suitable for determining volatile organic compounds from C2 to C7 in air is described. It consists of a capillary cold trap filled with graphitic carbon, a thermodesorbing device, a capillary gas chromatograph equipped with an alumina column and a flame ionization detector. Dry, as well as humid, air samples can be analysed with our system. Up to 2-1 samples of air can be enriched on our trapping device by using Nafion membranes for removing water. Direct analysis of air samples is possible by enriching 250 ml on the carbon trap. The recovery, sensitivity and linearity of our system have been checked with standard mixtures and real samples. The performances have been compared with those afforded by a commercially available instrument exploiting a different enrichment procedure. The results obtained show that our analyser can be successfully applied to determinations of C2 to C7 hydrocarbons present in air samples at levels of 0.01 ppb (v/v).     

乐平铅锌硫矿浮选工艺研究

文章从试样的工艺矿物学研究出发,在查明试样化学成分、矿物组成、结构构造、赋存状态和嵌布关系的基础上,依据矿石性质制定了试验方案,尔后进行了大量的条件试验,以确定最佳的工艺参数,并以全流程闭路试验予以验证,取得了良好的分选指标,为合理利用国家矿产资源,提供了详实的设计依据。     

国外某氧化铜矿选矿工艺研究

文章从试样的工艺矿物学研究出发,在查明试样化学成分、矿物组成、粒度特性、赋存状态和嵌镶关系的基础上,依试样性质,通过探索性试验确定试验方案与工艺流程,并进行了大量的条件试验,以确定最佳的工艺参数。尔后开展了全流程闭路试验,取得了良好的分选指标,为合理利用有限的矿产资源,提供了可靠的设计依据。     

青海都兰铜铅锌矿浮选工艺研究

文章从试样的工艺矿物学研究出发,在查明试样的化学成分、矿物组成、结构构造、赋存状态和嵌镶关系的基础上,进行了大量的条件试验,以确定最佳的工艺流程和工艺参数,并开展了闭路试验,取得了较优的分选指标,为合理利用国家矿产资源,提供了详实的设计依据.     

The influence of microgravity on the solidification of Zn-Bi immiscible alloys

Four experiments with alloys from the immiscible Zn-Bi system have been performed under microgravity conditions. Two alloys with a composition slightly within the miscibility gap (8 pct Bi) were cooled through the miscibility gap with two different cooling rates. It was found that Bi droplets were rather homogenously distributed in the samples, but the sizes of the droplets were somewhat larger than what would be expected from diffusion controlled growth. In samples with higher Bi contents (24 pct and 38 pct) larger areas of Bi-rich phase appeared in the center of the samples and as a layer around the samples. Calculations of the droplet size have been performed and compared with the experimental found droplet size. The calculated size was smaller and the difference was shown to depend on a collision coalescence. The layer around the samples was explained by a flotation of Bi-droplets to the surface.     

火花源原子发射光谱仪分析小样品

应用火花源原子发射光谱仪分析小样品。研究了试样的制备、磨制、激发条件、标准化、控样校正等条件。通过严格制样、磨样工序,选择适宜的冲气和预燃时间来提高分析精度;采用控样消除线材和绘制工作曲线块状样品不同所产生的系统误差。方法用于焊条钢、硬线、低合金钢等直径较小试样成分分析,相对标准偏差均小于3%,符合国家标准方法要求。     

Effect of Hot-Isostatic-Pressing Parameters on the Microstructure and Properties of Powder Ti-6Al-4V Hot-Isostatically-Pressed Samples

Ti-6Al-4V powders have been hot-isostatically-pressed (“HIPped”) using a range of hot-isostatic-pressing (“HIPping”) conditions, and the effects on microstructure and mechanical properties have been assessed. The properties were measured on test samples machined from HIPped powder billets and on samples that contained the as-HIPped surface. The fatigue limit of samples that contained the as-HIPped surface was improved by using a new HIPping procedure. The machined samples that had been HIPped at 1203 K (930 °C) exhibited a better balance of properties than those HIPped at 1153 K (880 °C) or 1293 K (1020 °C). The fine microstructure, formed from the martensitic structure of the atomized powder, coarsens with the increase of temperature or time during HIPping. These changes have been correlated with the corresponding changes in properties and with the fracture surfaces. The significance of these observations, especially the fatigue properties of samples that contain the as-HIPped surface, is discussed in terms of the properties of net-shape HIPped components.     

Characterisation of a novel Drosophila melanogaster testis specific PP1 inhibitor related to mammalian inhibitor-2: identification of the site of interaction with PP1

Paralytic shellfish poisoning (PSP) toxins are produced by certain dinoflagellate species such as Gymnodinium catenatum and Alexandrium tamarensis, during certain periods of the year influenced by several environmental factors, affecting the aquaculture industry and mainly bivalve molluscs. HPLC with fluorescence detection is a powerful analytical technique for the analysis of such toxins; several HPLC alternatives have been developed in order to improve the liquid chromatographic analysis, but due to the complexity of the sample matrix, important work has been focused recently on the clean-up of samples prior to HPLC analysis. Solid-phase extraction procedures offer advantages for this clean-up. In this work we focus on the study of three different clean-up methods prior to HPLC with fluorescence detection analysis of PSP toxin present in contaminated mussel samples; by spiking uncontaminated mussel samples with two different PSP toxin standards and by calculating the recovery values for these experiments. These recoveries must be taken into account in order to quantify the exact amount of PSP toxins present in the contaminated samples.     

富Sm合金实验研究用坩埚材质的选择

综合分析在富Sm合金的熔炼和分析检测研究中,其相应的原材料,环境和坩埚对其组织结构和分析结果的影响。共比较了2种类型的原材料和4种常用的坩埚,包括氧化铝坩埚,氮化硼坩埚,钼坩埚和钽坩埚。实验中一致采用将样品或者装有样品的坩埚密封于钽坩埚中进行熔炼。综合比较发现,使用将样品密封于合适大小的钽坩埚中进行随后的熔炼和分析是有限实验条件下最适宜的方法,可有效地避免Sm的挥发、氧化,并可尽量减少坩埚对合金的污染。