Brief news

China officially cancelled rare earth export quotasMr.Shen Danyang confirmed at the Regular Press Conference of Minis try of Commerce on 21 January2015 that the Ministry of Comerce would cancel export quota management on rare earths since 1st January2015 and the export tariff of rare earths would remain unchanged till 2nd May 2015 when he answered a question of the journalist.Cancellation of export quotas on rare earth,tungsten and molybdenum by the Chinese government has aroused high concerns.The head of the Department of Treaty and Law of the Ministry of Commerce spoke on the topic on 13 January 2015.He expressed,"cancellation of export quotas on rare earth,tungsten and molybdenum is a policy adjustment,matching with reform of administration system on rare earths and other     

Brief news

<正>China officially cancelled rare earth export quotasMr.Shen Danyang confirmed at the Regular Press Conference of Minis try of Commerce on 21 January2015 that the Ministry of Comerce would cancel export quota management on rare earths since 1st January2015 and the export tariff of rare earths would remain unchanged till 2nd May 2015 when he answered a question of the journalist.Cancellation of export quotas on rare earth,tungsten and molybdenum by the Chinese government has aroused high concerns.The head of the Department of Treaty and Law of the Ministry of Commerce spoke on the topic on 13 January 2015.He expressed,"cancellation of export quotas on rare earth,tungsten and molybdenum is a policy adjustment,matching with reform of administration system on rare earths and other     

Physico-chemical analysis of collagen and its mixtures with water-principles of microcapsular therapeutic systems

At present, the attention of producers of medicinal preparations is focussed on therapeutic systems of microcapsular type the manufacture of which is based on nanotechnologies.     

Physico-chemical analysis of collagen and its mixtures with water-principles of microcapsular therapeutic systems

At present, the attention of producers of medicinal preparations is focussed on therapeutic systems of microcapsular type the manufacture of which is based on nanotechnologies.……     

Study of relationship between structure and transmittance of diamond-like carbon (DLC) films

In this paper, the transparent hard diamond-like carbon (DLC) films were deposited on glass substrate by magnetic confined radio-frequency plasma chemical vapor deposition. The structure of films was studied by Raman spectra and X-ray photoelectron spectra (XPS), the transmittance of films by Spectrophotometer. The mechanism of the influence of films structure on transmittance of the films was discussed. The results show that the thickness of films was lower than 100nm, and the transmittance was over 90, in 380-780 nm region. Discussion in theory on the influence of film structure on transmittance was correspondence to experiment results.     

2015 Top 10 RE Scientific News in China(continued)

正6."Development of high-performance rare earth luminescent material for white LED"project by Fujian Institute of Research on the Structure of Matter(FJIRSM)passed the acceptance"Development of high-performance rare earth luminescent material for white LED",a key specific ST subject in Fujian province,led by Fujian Institute of Research on the Structure of Matter(FJIRSM)passed the experts acceptance on January 29,2015.     

Study on the outburst prone of different fault sides

Most outbursts of gas and coal occur along geological structural zones during mining. Recent research revealed that most outbursts occurred on the downthrow sides of faults,and the key reason is that the outburst coal, often known as tectonic coal or soft coal, mainly exists on the downthrow wall of faults-hanging of normal faults or footwall of reverse faults.This paper will mainly discuss the outburst prone on different sides of faults and its causes.     

上解放层开采对下煤层卸压作用研究

Based on the geological conditions and mining parameters of the coal mining face in No.12 mining block of Jining No.3 Mine,a similar simulation in the lab was conducted on the mining process of the coa...     

Study on the distribution of strata rock temperature around a driving head with auxiliary ventilation

The distributions of strata rock temperature around a driving head with auxiliary ventilation were analyzed theoretically based on a program which was developed by the authors to predict the therrhal environmental conditions in a development heading with forcing auxiliary ventilation. The influences of wetness of the airway surface were discussed on the cooled zone of the strata rock and on the temperature distribution in the surrounding rock. It is shown that the advancing speed and driving time have little influence on the temperature profile in front of the working face of a driving airway, and the rock temperature 1.5 m ahead of the working face can be taken as the virgin rock temperature.     

Monitoring and Forecasting of Interior and Exterior Pressures on Shaftwalls through Deep Soil

Upon the analysis of the interior and exterior pressures observed on the double-tubbing shaftwalls of the West Ventilation Shaft in Xieqiao Coal Mine of Huainan, deep-going investigations are made into foreign loads on the shaftwalls of this kind at each working stage and into the distributional patterns of interior pressures. As a result, a calculation model is established for forecasting exterior loads on the shaftwalls by using the grey theory.     

调浆过程能量输入对微细粒白钨浮选矿浆流变特性的影响研究

采用矿浆流变性测试与浮选试验,研究了微细粒白钨矿浮选体系中微细粒白钨矿、方解石、石英及其人工混合矿矿浆流变性、浮选行为与调浆过程能量输入之间的关联机制。结果表明,微细粒白钨矿与方解石矿浆表观粘度高、屈服应力大、聚团程度较严重,造成混合矿具有较大的表观粘度与屈服应力。通过搅拌调浆过程能量输入调控,能够显著提升浮选过程选择性。     

以CF为捕收剂氧化铅锌矿浮选新方法

以CF药剂为捕收剂，研究氧化铅锌矿物和含钙，镁，铁，硅脉石脉石矿物的浮选分离。结果表明，CF药剂可选择性捕收菱锌矿，白铅矿，而对方解石，白云石，石英和褐铁矿作用较弱，六偏磷酸钠和硫酸锌盐化水玻璃选择性抑制方解石，白云石，石英和褐铁矿，Pb(NO3)2是菱锌矿和白铅矿的有效活化剂。CF直接浮选和活化浮选，在自然pH值矿浆条件下都能较好地将菱锌矿，白铅矿与方解石，白云石，石英和褐铁矿分离，活化浮选能有效地降低CF药剂的用量，人工混合矿物的浮选验证了工艺的可行性。     

煤颗粒分布对油煤浆流变特性的影响

采用神华煤和煤直接液化循环油配制成油煤浆，考察了煤的颗粒大小、颗粒分布以及浓度对煤浆流变特性的影响.试验结果表明：当浓度较低时，煤浆在比较宽的浓度范围内表现为牛顿流体；浓度较高时，表现为具有剪切稀化行为的假塑性流体.利用双峰级配理论，将粗颗粒煤粉加入细颗粒中可降低煤浆体系的黏度.但继续增大粗颗粒在煤粉中的比例，体系的黏度又会增大，而且煤浆的流变性能也发生改变.在试验条件下，粗细颗粒质量百分比为40∶60时体系具有最低的黏度，煤浆性质由同浓度的细颗粒体系的非牛顿流体转变为牛顿流体.因此，改变煤浆体系中煤的颗粒分布可在保持较高浓度时制备出具有较低黏度的油煤浆.     

The effect of reagents on selective flotation of smithsonite–calcite–quartz

In this paper the effects of sodium sulphide, sodium hexa methaphosphate (SH), sodium fluoric, starch and sodium silicate adsorption on smithsonite, quartz and calcite surfaces at various pH values, and using Armac C and oleic acid as collectors were investigated through microflotation. Also, the effects of various primary amine collectors (Armac C, Armac T, Flotigam SA, Flotigam TA and Armeen TD) were investigated for smithsonite flotation. The flotation tests were performed using purified samples from Angooran mine by the microflotation technique. The cationic flotation results showed that the maximum recovery of smithsonite could be improved to 92% using 400 g/t Armac C and 500 g/t sodium sulphide at pH 11. Also, the quartz and calcite recoveries reached 98% and 89%, respectively, at the above mentioned conditions. Moreover, using 1250 g/t SH and 1500 g/t sodium silicate as a depressant, the quartz and calcite recoveries decreased to 70% and 20%, respectively, and also the smithsonite recovery was reduced to 82%. Furthermore, the experiments showed that the behavior of sodium fluoric as a quartz depressant is similar to that of sodium silicate. Flotation results using oleic acid revealed that the maximum recovery of 90% occurs at pH 9 and 500 g/t oleic acid. Also, the quartz and calcite recoveries reached 26% and 87%, respectively, in the anionic flotation conditions. Increasing amount of sodium silicate to 2000 g/t caused a decrease in the smithsonite recovery to 87% and also decreased the calcite and quartz recoveries by 10% and 15%, respectively.     

某铜矿全尾砂/废石复合充填料浆流变特性研究

全尾砂充填料浆流变性能对管道输送及充填体强度有重要影响。对某铜矿充填料浆采用不同配比实验,通过实验数据选取合适的流变模型,用Origin模拟出回归方程,研究了屈服应力、表观黏度与质量浓度、废石掺量、灰砂比的关系。结果表明,屈服应力随质量浓度升高而增大,当全尾砂质量浓度超过70%,屈服应力显著增大;质量浓度为72%时,适量掺入废石能提高充填料浆的初始表观黏度,废石量超过10%,初始表观黏度则会逐渐降低;浓度低于66%,对初始表观黏度几乎没有影响;废石掺量为0时,灰砂比越大,屈服应力越大;废石掺量为10%、20%时,灰砂比大小对屈服应力几乎无影响;废石掺量为30%、40%时,灰砂比越大,屈服应力越小;质量浓度对屈服应力影响最为显著。     

掺固硫灰水泥胶结磷尾矿充填料浆流变性能

采用跳桌流动度仪和旋转黏度计研究了掺固硫灰水泥胶结磷尾矿充填料浆的流变性能,分析了固硫灰掺量、胶砂比及质量浓度对流变性能的影响。研究表明,掺固硫灰水泥胶结磷尾矿充填料浆的流变曲线符合宾汉塑性流体特征,料浆的触变性很弱。料浆中固硫灰掺量增大时,流动度降低,塑性黏度增大。当胶砂比减小至1∶8或质量浓度高达76%时,固硫灰用量对流动度和塑性黏度的影响程度显著降低。料浆质量浓度为74%时,屈服应力与固硫灰掺量和胶砂比呈正相关。质量浓度高达76%时,固硫灰掺量对屈服应力无显著影响。当料浆胶砂比为1∶5～1∶6,质量浓度为76%时,为保证料浆的顺利泵送应控制固硫灰掺量在40%以内。     

Influence of important factors on flotation of zinc oxide mineral using cationic, anionic and mixed (cationic/anionic) collectors

In this study, the influences of important factors on smithsonite flotation are investigated. Dosages of sulphidizing agent and collector, desliming prior to flotation and the use of sodium hydroxide instead of sodium carbonate as the pH regulator are essential to the effective recovery of smithsonite in cationic flotation. The appropriate temperature for flotation was found to be 30–40 °C. Sodium hexametaphosphate (SH) and sodium silicate had the greatest selectivity between smithsonite–calcite and smithsonite–quartz, respectively. The results of oleic acid flotation showed that the grade and recovery of zinc were relatively low in comparison with the sulphidization-cationic flotation method. Despite using sodium silicate and SH as depressants in oleic acid flotation, flotation was not selective. Flotation using mixed collectors (Armac C + Potassium Amyl xanthate) showed promising results. The ratio of the mixed collectors and the sequence of addition of mixed collectors were important criteria in attaining true mixed collector flotation.     

多因素耦合条件下高浓度全尾砂浆体流变性能研究

为了探究多因素耦合条件下全尾砂料浆的流变性能,以某三个矿山的全尾砂料浆为试验对象,采用HAAKE同轴圆筒式流变仪进行试验,测得了5种质量浓度、3种温度条件下的全尾砂浆流变参数,分析了粒度分布、质量浓度及温度对流变参数的影响规律及机理。试验结果表明:同一矿山尾矿浆体,相同质量分数条件下,屈服应力随温度升高而降低,且浆体浓度越高,屈服应力的下降值越大;相同温度条件下,屈服应力随浓度增加而升高,且浆体温度越低,屈服应力增加值越大;料浆屈服应力的影响显著度为质量浓度粒度分布温度,质量浓度对流变性影响最为显著且可用指数函数描述;各因素间均存在一定的耦合作用,A矿和C矿尾砂浆的质量浓度高于71%、B矿尾砂浆质量浓度高于68%时,温度和浓度耦合作用明显,料浆的屈服应力和塑性黏度均明显上升。     

组合助磨剂对石英粉磨的影响及其作用机理研究

为了提高石英的磨矿效率,将助磨剂硅酸钠和六偏磷酸钠组合使用,研究其对石英粉磨的影响机理。磨矿过程中,组合助磨剂在最佳添加量为0.5%时,与无助磨剂和添加硅酸钠及六偏磷酸钠相比,磨矿产品中-0.043mm粒级的含量分别提高了9.90个百分点、3.34个百分点和2.23个百分点,明显提高了石英的磨矿效率。矿浆黏度检测发现,组合助磨剂明显降低了矿浆的黏度,提高了矿浆的分散性与流动性;红外光谱、XPS表面元素分析以及溶液化学表明,在矿浆pH=9.89时,石英被磨矿用水中钙离子活化,组合助磨剂以HPO_4~(2-)和HSO~(3-)为主要活性物,在被钙离子活化石英表面的Si-O-Ca~+活性位点上产生化学吸附;量子力学计算表明,组合助磨剂在活化石英表面的吸附作用更强,其通过吸附作用会明显降低石英的比表面能,因此与两种单一助磨剂相比,组合助磨剂能明显提高石英的磨矿效率。     

分级细尾砂胶结充填强度和料浆流变性能试验研究

以某黄金矿山分级细尾砂为研究对象,在对充填材料基本物理化学性质检测分析的基础上,开展了强度试验和料浆流变特性试验。结果表明: 新型胶凝材料固化分级细尾砂效果好,充填体早期强度较传统胶凝材料高,有利于缩短采矿周期。添加新型胶凝材料的分级细尾砂料浆流变曲线符合Herschel-Bulkley(H-B)流变模型,随尾砂浆浓度增加,料浆屈服应力呈指数增长,而塑性黏度缓慢增加; 料浆屈服应力随新型胶凝材料掺量增加不断增大,塑性黏度则先增大后降低。