降低某含砷硫铜金精矿氰化尾渣金品位试验研究

某含砷硫铜金精矿用HOPF-防膜剂预处理3～5h后,氰化浸出尾渣中金品位从3.5～4.3g/t下降至0.7～1.2g/t.在氰化过程中,金精矿中的一些单体金粒表面上形成的红褐色薄膜得到抑制,缩短了氰化浸出时间,提高了金浸出率.     

从氰化尾渣中回收金的氰化工艺研究

焙砂氰化尾渣、细菌氧化—氰化工艺生产的氰化尾渣(后简称细菌氧化氰化尾渣)分别与助浸剂一起细磨10—30min后,在选择条件下进行常规氰化浸出,可使焙砂氰化尾渣的金品位从1—3g／t下降到0．3—0．5g／t,细菌氧化氰化尾渣的金品位从3—11．2g／t下降至0．5—1．1g／t,其中部分氰化尾渣金的氰化浸出率可达90％—95％。     

硫精矿烧渣中铁、金综合回收试验研究

含硫51.6%、金0.98 g/t的硫精矿经过焙烧,在温度850℃条件下,获得含铁66.81%、金1.31 g/t的烧渣。烧渣经水浸除硫后,进行了硝酸铅预处理、氰化浸金,金的浸出率达51.9%。     

含金物料熔融氯化提金中试探索

在小试基础上,分别对氰化尾渣和焙砂进行熔融氯化工艺中试,考察电炉工艺对不同条件的适应情况。氰化尾渣试验结果表明:添加4%～12%的氯化钙,金挥发率最高可以达到99%,渣含金可控制在0.5g/t以下。焙砂(炉底积料)试验结果表明:原料金品位89.64g/t,因铁硅比高,渣沉降效果差,导致渣含金2～7g/t。工程设计过程中,应该控制原料水分、调节熔渣成分、考虑分段挥发,确保金属充分回收。     

艾砂磨机在某黄金冶炼公司的试验研究

某黄金冶炼公司采用分级磨矿工艺处理高硫金精矿,磨矿细度-0.037 mm占95%,氰渣金品位在1.30 g/t左右。为进一步探索降低氰渣金品位的可能性,开展了艾砂磨机磨矿半工业试验。结果表明：经艾砂磨机磨矿后,磨矿产品在-5.21μm、-9.86～+5.21μm 2个细粒级的分布率增加,在+14.50μm各粒级的分布率降低,且艾砂磨机磨矿比较均匀;氰化浸出氰渣金品位从1.30 g/t左右降低至1.10 g/t,银品位从11.30 g/t降低至9.50 g/t,经济效益显著。     

某复杂难处理硫精矿综合回收的试验研究

以昆明某复杂难选硫精矿为原料，先在马弗炉中进行了焙烧脱硫砷的条件试验，得出了焙烧的最佳操作条件后，以沸腾炉(工业生产炉床面积74 m²)中产出的烧渣为原料进行了氰化提金银的条件试验。该硫精矿综合处理的最佳条件为：焙烧温度840～870℃,焙烧时间2～2.5 h;烧渣磨矿细度-0.038 mm≥90%,氰化钠加入量2 kg/t,浸出液固比2∶1等，此时硫脱除率达99%以上，金浸出率达84%;经分析氰化尾渣可作为铁精矿出售。该项目已在云南某企业建成处理量300 t/d复杂含金硫精矿提金的工业生产线。     

含金银硫铁精矿烧渣综合回收有价金属试验研究

根据硫铁精矿沸腾炉焙烧产物烧渣的理化性质，开展烧渣回收金、银、铜、铁试验研究。最佳酸浸条件下，获得酸浸渣渣率93.75%、脱Cu率27.08%、脱As率39.72%；酸浸渣最佳氰化条件下，获得金、银氰化浸出率分别为77.45%和49.15%，高于生产水平，氰化渣含Au 0.69 g/t、Ag 12 g/t、Cu 0.11%、Fe 60.69%、As 0.17%、S 0.49%，浸渣金、银品位均较低；采用BY代号药剂处理酸浸溶液，铜回收率达99.9%，铁回收率达72%。     

攀钢雾化提钒工艺中型水口提钒试验

攀钢雾化提钒工艺采用中型水口提钒,可使铁水平均雾化能力从小型水口的300～340t/h提高到400～450t/h,钒氧化率平均达到86.42％,碳烧损率平均为16.1％,平均温度为1325℃,碳含量平均为3.75％,余钒平均为0.042％的半钢和平均成分(％)为:V_2O_6>19.0,SiO_2 11.7,P<0.08,CaO<1.0,MFe≤20的钒渣。     

氰化尾渣还原焙烧—烧渣浮选富集金铜的试验研究

某复杂多金属金精矿采用直接氰化工艺提取金银后产出的氰化尾渣含Au 1.20 g/t、Cu 0.52％、S 47.50％、Fe 41.02％,具有较高的回收价值.采用还原焙烧—烧渣浮选工艺流程回收金、铜等,在最佳条件下,获得的金铜精矿产率为9.52％,金、铜品位分别为15.20 g/t、6.82％,回收率分别为76.16...     

某地铜钴渣氧压酸浸工艺研究

研究了采用氧压酸浸工艺从铜钴渣中浸出铜、钴的方法,得到最佳试验条件为:铜钴渣用量250 g,液固比(2.5～3):1,初始硫酸酸度10g/L,木质素0.5％,浸出温度175℃,氧气压力1.6 MPa,浸出时间2 h,在此条件下铜和钴的浸出率分别大于98％和99％.     

高铋铅阳极泥碱性氧化浸出渣 熔炼-电解提铋研究

以高铋铅阳极泥碱性氧化浸出渣为原料,采用碳热还原熔炼-电解工艺提取铋,同时富集金银.热力学分析表明金属碳热还原的初始温度由低到高依次为:铜、铋、铅、锑、锡;铋氧化物在800 ℃以上可获得足够大的还原热力学推动力.熔炼粗铋合金的最佳温度为800 ℃,碳用量为浸出渣质量的5 %,四硼酸钠用量为浸出渣质量的15 %,熔炼时间为1.5 h.在此条件下,粗铋合金中铋、金、银的平均含量分别为84.29 %,39.62 g/t和6 519 g/t,相比于铅阳极泥原料,金银分别被富集1.8倍.采用公斤级粗铋合金板为阳极,在BiCl₃-NaCl-HCl体系中分别电解24 h、48 h、72 h、112 h,阴极产物中铋平均含量＞98 %,电流效率＞96 %,铋电解阳极泥中金、银平均含量分别为222.94 g/t,34 287.6 g/t,相比铅阳极泥原料,金银平均被富集到9.54倍和10.13倍.      

刚果(金)某氧化铜钴矿絮凝沉降试验研究

对刚果(金)某氧化铜钴矿进行絮凝沉降试验研究。结果表明,原矿在磨矿粒度-0.150mm占80%、矿浆浓度10%～12%、絮凝剂用量5～10g/t,絮凝剂浓度0.05%～0.1%的条件下,沉降速度最高可达25m/h,底流浓度可达54%以上。对于磨矿粒度-0.150mm占80%、酸矿比132kg/t、初始矿浆浓度25%、常温浸出时间4h的浸出矿浆,在矿浆浓度6%、絮凝剂用量20g/t,絮凝剂浓度0.1%的条件下,沉降速度最高可达22m/h,底流浓度可达47%以上。     

河北某矿石中金的氰化及混汞试验研究

为了回收河北某矿石中的元素金,对该矿矿石进行了氰化浸金及混汞试验研究。在原矿金品位23.6 g/t,磨矿细度-200目含量为91.2%,NaCN用量为2.5 kg/t,浸出时间24h条件下,获得了浸渣金品位0.403 g/t,金浸出率为98.29%的氰化浸出指标。混汞金回收率为48.86%。     

Effect of glucose supplement timing on protein metabolism after resistance training

We determined the effect of the timing of glucose supplementation on fractional muscle protein synthetic rate (FSR), urinary urea excretion, and whole body and myofibrillar protein degradation after resistance exercise. Eight healthy men performed unilateral knee extensor exercise (8 sets/approximately 10 repetitions/approximately 85% of 1 single maximal repetition). They received a carbohydrate (CHO) supplement (1 g/kg) or placebo (Pl) immediately (t = 0 h) and 1 h (t = +1 h) postexercise. FSR was determined for exercised (Ex) and control (Con) limbs by incremental L-[1-13C]leucine enrichment into the vastus lateralis over approximately 10 h postexercise. Insulin was greater (P < 0.01) at 0.5, 0.75, 1.25, 1.5, 1.75, and 2 h, and glucose was greater (P < 0.05) at 0.5 and 0.75 h for CHO compared with Pl condition. FSR was 36.1% greater in the CHO/Ex leg than in the CHO/Con leg (P = not significant) and 6.3% greater in the Pl/Ex leg than in the Pl/Con leg (P = not significant). 3-Methylhistidine excretion was lower in the CHO (110.43 +/- 3.62 mumol/g creatinine) than P1 condition (120.14 +/- 5.82, P < 0.05) as was urinary urea nitrogen (8.60 +/- 0.66 vs. 12.28 +/- 1.84 g/g creatinine, P < 0.05). This suggests that CHO supplementation (1 g/kg) immediately and 1 h after resistance exercise can decrease myofibrillar protein breakdown and urinary urea excretion, resulting in a more positive body protein balance.     

细粒级氧化铜矿浸出矿浆絮凝沉降试验

采用复合絮凝剂对某细粒级氧化铜浸出矿浆进行沉降试验,考察了絮凝剂种类和用量、矿浆浓度等对沉降性能的影响。结果表明,当矿浆质量浓度为8%,每吨干渣PHP-5与PHP-8用量分别为48g和12g时,矿浆沉降速度达到5.1m/h,完全满足工业要求。     

某铜金氧化矿高氰高碱综合回收金铜试验

针对某含铜氧化金矿开展高氰高碱综合回收金铜试验。结果表明,在矿石细度-0.074mm占93.54%、氰化钠浓度1000mg/L、矿浆浓度40.00%、浸出时间48h、炭用量10g/L的条件下,金浸出率为89.67%,炭金品位313.20g/t,铜品位1304.48g/t。炭浸贫液通过酸化法脱铜回收氰根,氰根回收率超过99%,同时铜以品位超过60%铜精矿回收。     

高温氢还原法制备纳米硅/石墨烯复合材料的结构与电化学性能

将Hummers法制备的氧化石墨烯(graphene oxide,GO)与纳米硅粉进行超声复合和高温氢还原,制备锂离子电池用纳米硅/石墨烯(Si/G)复合材料。利用扫描电镜、透射电镜、X射线衍射和Raman光谱分析,对Si/G复合材料的形貌与结构进行分析与表征,并测试其电化学性能。结果表明,通过高温氢还原,氧化石墨烯全部还原为石墨烯,无其它杂质相生成。石墨烯包覆在纳米硅颗粒表面,形成层状复合结构;与纯纳米硅粉相比,Si/G复合材料的电化学性能明显提高,在300 m A/g电流密度下,首次放电比容量为2 915.0(m A·h)/g,首次充电比容量为1 080.5(m A·h)/g,20次循环后比容量稳定在969.6(m A·h)/g,库伦效率为99.8%;而纯纳米硅粉的首次放电比容量和首次充电比容量分别为932.7和349.4(m A·h)/g,20次循环后比容量仅为6.4(m A·h)/g。     

Mechanical properties of dispersion-strengthened Cu-Al2O3 materials

Conclusions Ductility properties characterized by the relative logarithmic strain-to-rupture or reduction in area are determined by the total volume fraction of Al₂O₃ particles and residual pores. The mean statistical size of ductile rupture pits is independent of the time of milling of the powder mixture. With increasing volume fraction of particles the pit size slightly grows as a result of agglomeration of very fine particles, which nucleate a larger pit in the course of ductile rupture. The effect of Al₂)₃ particles on _0.2 was examined in the light of Orowan's and Ansell-Lenel's relationships. Experimental values of yield stress of the matrix material without disperse particles were found to agree well with Ansell-Lenel's model. It is possible that a more detailed analysis might lead to a more general _0.2 =a+ kl^–m relationship being obtained, where m is close to 1/2.Translated from Poroshkovaya Metallurgiya, No. 4(208), pp. 63–67, April, 1980.     

Subcutaneous absorption kinetics and local tissue distribution of interferon and other solutes

The subcutaneous absorption and consequent tissue distribution of interferon g was studied in an anaesthetized rat model. Interferon g showed a biphasic disappearance profile from a solution in a subcutaneous absorption cell. Both the initial rapid distribution phase and slower removal phase followed first order kinetics. The steady-state clearance of interferon g from the cell was 1.41 +/- 0.38 x 10(-3) mL min-1, and the absorption half-life (t1/2) was 3.8 +/- 1.1 h (n = 4). Noradrenaline did not significantly alter either the clearance or absorption of interferon g (1.18 +/- 0.44 x 10(-3) mL min-1, P > 0.05, absorption t1/2 4.96 +/- 1.9 h, P > 0.05). Given that the clearance of smaller solutes, such as tritiated water, is significantly reduced when noradrenaline is coadministered, it is suggested that interferon g is removed via the lymphatic system rather than by the local blood supply. The amount of interferon g recovered in the plasma, urine and muscle is minimal relative to other solutes where the recovery is almost complete.     

某碱性碳酸盐型含铜金矿氨氰工艺研究

采用氨氰浸出法处理某碳酸盐型难选冶含铜金矿。结果表明,控制给矿粒度-0.074mm占95%、石灰用量4.0kg/t、硫酸铵用量8.0~9.0kg/t、氰化钠总用量0.5~0.7kg/t、滚瓶氰化浸出52~72h,然后在活性炭密度10g/L吸附20~24h,进行12次循环试验,平均金浸出率86.0%,最终载金炭铜金比约2.0,金吸附率近100%,不存在铜、TDS逐渐累计问题。