镍钼矿两段氧压酸浸工艺研究

研究了采用两段氧压酸浸工艺从钼镍矿中浸出钼、镍。结果表明:在两段氧压酸浸最佳条件下,镍、钼浸出率分别大于99.5%和75%;Ⅰ段浸出液中,铁离子、硫酸质量浓度均低于2g/L,可直接用离子交换法回收钼、镍,溶液处理成本大大降低。     

全湿法处理钼镍矿的新工艺

本文针对钼镍矿难处理的技术现状,提出了一种加压酸浸、常压碱浸、萃取相结合的全湿法处理镍钼矿的新工艺。试验结果表明,在加压酸浸时,钼的转化率可以达到98.3%以上,镍的浸出率达到98.7%。经过碱浸、萃取后钼镍综合回收率达92%以上。     

氧压浸出处理黑铜泥

氧压浸出工艺作为一种强化冶金技术,具有技术指标稳定、作业环境良好、生产成本较低的特点,且对黑铜泥中砷浸出效果优于常规氧压酸浸、氧压碱浸。采用氧压浸出工艺处理黑铜泥,探索了硫酸初始浓度、压力、反应温度、液固比、反应时间等对铜、砷浸出的影响。结果表明,在液固比8 mL/g、硫酸初始浓度80 g/L、反应温度120 ℃、氧分压0.3 MPa、反应时间2 h的条件下,铜、砷浸出率分别达到99.78%、97.08%,其中砷浸出率分别比氧化酸浸、氧化碱浸工艺高出7.79、9.76个百分点。是黑铜泥浸出处理工艺的良好选择,适合常规铜冶炼企业技术升级改造。     

某硫化铜镍精矿氧压浸出动力学试验研究

采用氧压酸浸处理硫化铜镍精矿。结果表明铜、镍的浸出率均随着温度升高、时间延长呈现线性上升的趋势,铜、镍的最高浸出率分别为98.53%、97.69%,经氧压酸浸,硫化铜镍精矿中的部分铁及脉石矿物浸出进入溶液中,将精矿中的贵金属富集到95g/t左右。动力学试验研究表明,硫化铜镍精矿氧压酸浸过程中铜、镍的浸出表观活化能分别为74.83～86.12kJ/mol和48.34～66.06kJ/mol,说明反应受化学反应控制。     

氨浸钼渣氧压碱浸工艺研究

研究采用氧压碱浸工艺处理氨浸钼渣,在浸出温度180℃、时间2 h、氧分压200 kPa、液固比2∶1、纯碱量为化学反应理论量的2.5倍时钼的浸出率可达96%以上。本工艺具有钼浸出率高、对环境友好以及提高经济效益的目的。     

氧压碱浸镍钼矿提钼试验研究

采用氧压-碱浸镍钼矿,在简要介绍和分析试验原理的基础上,以钼浸出率为考察指标,重点探讨加碱量、温度、时间、液固比、矿物粒度等参数对钼浸出率的影响。试验结果表明:在NaOH为100 g/L、Na_2CO_3/镍钼矿质量比为30%、反应温度100℃、反应时间5 h、液固比3∶1、粒度0.074~0.058 mm条件下,钼浸出率可达97%以上,Ni在浸出渣中含量提高1.43%以上,钼在浸出渣中含量可降低至0.78%以下,有效实现了镍钼矿中的镍、钼分离。     

硫化铜镍精矿的氧压浸出试验研究

针对云南某地的硫化铜镍精矿,采用氧压酸浸工艺处理该硫化铜镍精矿。通过试验影响因素的探索,得出了该硫化铜镍精矿氧压酸浸的最佳技术参数:木质素为0.5%、浸出温度190℃、浸出压力1.4 MPa、酸度90 g/L、液固比3.0∶1、浸出时间3 h,Cu、Ni的浸出率均在98%以上,实现硫化铜镍精矿中铜和镍的高效浸出。     

从废高温镍钴合金中浸出镍和钴的试验研究

研究了采用"苏打焙烧-碱浸出铝、钼-氯气浸出钴、镍、铁等-TBP萃取除铁-中和水解除铬-P204萃取除微量杂质-N235萃取分离镍、钴"工艺处理废高温镍钴合金,重点考察了从废镍钴合金中浸出镍和钴,讨论了苏打焙烧温度和碱浓度对铝、钼浸出率的影响,碱浸渣氯气浸出电位、浸出时间、废合金粒度、添加剂的加入等因素对镍、钴浸出率的影响.试验确定了从废高温镍钴合金中浸出镍、钴的工艺优化条件.综合条件下,镍、钴平均浸出率分别为99.30%和97.67%,浸出渣中镍、钴质量分数平均为0.51%和0.44%.     

从铜阳极泥中氧压浸出有价金属试验研究

研究了采用3种加压氧化方式从铜阳极泥中浸出有价金属,考察了阳极泥中铜、碲、硒、银的走向。结果表明:直接氧压酸浸,阳极泥中的硒被部分浸出,不利于集中回收;氧压碱浸工艺流程长,工艺复杂,银被分散;水浸—氧压酸浸过程中,控制体系温度130℃,氧压0.8 MPa,铜浸出率达98.3%,碲浸出率为46.8%,硒浸出率仅0.11%,银集中在渣中,有利于下一步集中回收。3种工艺中,以水浸—氧压酸浸效果最佳。     

镍钼矿全湿法浸出工艺研究

采用酸性氧化浸出-酸渣碱浸工艺对镍钼矿进行了浸出回收。结果表明:在盐酸用量为0.52 mol(每100 g原矿),固体氧化剂N1用量为原矿质量的60%,液固比为3∶1,温度90℃左右,浸出时间2 h的条件下,镍、钼浸出率分别为92%、60%;在氢氧化钠用量为酸浸氧化后干渣质量的45%,液固比为3∶1,温度40~50℃左右,浸出时间15 min的条件下,钼浸出率可达90%以上,钼的总回收率在96%以上。该工艺流程简单、能耗较少、镍钼回收率高,可避免火法脱硫的烟气污染。     

铁氧化细菌的分离及其浸出钼镍尾矿试验

从钼镍矿区矿坑废水中分离出1株嗜酸性硫杆菌,通过对该菌株形态及理化特征检测分析,初步鉴定为氧化亚铁硫杆菌(Acidithiobacillus ferrooxidans,A.f菌)。以FeSO_4·7H_2O和钼镍尾矿作为能量来源对其驯化培养,并利用驯化与非驯化的A.f菌进行摇瓶浸出钼镍尾矿试验。结果表明,驯化后的A.f菌更有利于尾矿中金属的浸出,4种目标金属浸出率大小顺序为NiZnAsMo,钼镍尾矿中Ni、Mo、Zn、As在驯化细菌作用下最大浸出率分别为62.41%、55.66%、41.87%、12.04%,比非驯化组高2~8个百分点;A.f菌浸矿过程中,存在细菌对矿物的直接作用机理及细菌产生的H~+、Fe~(3+)对矿物的间接作用机理,H~+在尾矿Ni、Zn的浸出中占主导作用,而As、Mo的浸出主要依靠Fe~(3+)对矿物的持续氧化作用。     

钼钴废催化剂回收利用的研究

进行了从钼钴废催化剂中回收提取Mo、Co、Bi、Ni的试验研究。采用先碱浸回收Mo,再酸浸分离Co、Bi、Ni,可有效回收钼钴废催化剂中的有价金属。     

Metal Recovery from Bottom Ash of an Incineration Plant: Laboratory Reactor Tests

The bottom ashes, produced by the industrial incinerators, are an essential secondary raw material resource that has been drawing attention to recover economically important metals. In the present study, a hydrometallurgical process (chemical leaching) has been discussed to recover some economically important metals using lab scale reactors (600 mL and 2L capacity). Prior to the leaching tests, the material was characterized for chemical composition and mineralogical phase analysis through XRD. In addition, the conventional process of magnetic separation was applied before leaching tests to remove some easily separable parts. Two acidic reagents (HCl and H₂SO₄) and an alkali reagent (NaOH) have been used to compare the recovery of metal values from the pre-treated bottom ash samples at varying concentrations. Process parameters such as acid/alkali concentration, working volume and temperature have been optimized and the recoveries of metal values under optimum conditions were recorded. The studies showed that 3M H₂SO_4, 1.5 L working volume and 80°C were sufficient to leach 88% Mo, 82% V, 37% Ni, 37% Fe, and 28% Cu. Acid leaching tests using H₂SO₄ were found to be an economical and appropriate solvent for metal recovery from bottom ash.     

Recovery and Marine Clay Stabilization of Heavy Metals Present in Spent Hydrotreating Catalysts

This paper presents the results of an investigation on the treatment of two industrial solid wastes produced by oil refineries in Singapore, namely Ni∕Mo∕γAl2O3 and Co∕Mo∕γAl2O3. Calcination at 500°C was effective in removing carbon and sulfur in both wastes followed by generation of heavy metal oxides. A two-stage leaching process was successful in removing 44% nickel, 77% cobalt, and 83% molybdenum. However, toxicity characteristic leaching procedure leaching tests for spent catalyst residues of Co∕Mo∕γAl2O3 and Ni∕Mo∕γAl2O3 after the two-stage leaching process showed that the concentration of Mo, Co, and Ni in the leachate exceeded the allowable limits. Finally, the residues, when subjected to an enhanced binder stabilization treatment with marine clay, produced a commercial-value brick made of up to 30% by weight spent catalysts. It is believed that stabilization can be achieved through either encapsulation whereby the clay forms a matrix around the heavy metals to prevent leaching or incorporation in which the heavy metals actually become part of the stabilizing matrix.     

低品位镍钼矿加钙氧化焙烧试验的研究

对难选镍钼多金属矿进行了加钙氧化焙烧工艺试验研究。对氧化钙用量、焙烧时间、液固比、浸出温度等条件进行了试验研究，确定了各个因素最佳条件：氧化钙为镍钼矿的35％，焙烧时间2h，液固比2：1，浸出温度95℃。钼、镍的浸出率分别高达97％、93％，固硫率65％。     

Electrochemical Behavior of Bulk Amorphous Steel Fe55M2Cr12Mo10B6C13Y2（M=Ni, Cu, Nb）

 Fe55Ni2Cr12Mo10B6C13Y2,Fe55Cu2Cr12Mo10B6C13Y2 and Fe55Nb2Cr12Mo10B6C13Y2 alloys with diameter of 4mm were produced by copper mold casting. The role of alloying additions (Ni, Cu or Nb) on corrosion resistance of Fe55Nb2Cr12Mo10B6C13Y2, Fe55Ni2Cr12Mo10B6C13Y2 and Fe55Cu2Cr12Mo10B6C13Y2 alloys were studied by polarization curves and electrochemical impedance spectroscopy (EIS). The results show that Fe55Ni2Cr12Mo10B6C13Y2 and Fe55Cu2Cr12Mo10B6C13Y2 alloys can be cast into bulk metallic glasses. Fe55Ni2Cr12Mo10B6C13Y2 and     

Electrochemical Behavior of Bulk Amorphous Steel Fe55M2Cr12Mo10B5C13Y2(M=Ni,Cu,Nb)

Fe55Ni2Cr12Mo10B6C13Y2,Fe55Cu2Cr12Mo10B6C13Y2 and Fe55Nb2Cr12Mo10B6C13Y2 alloys with diameter of 4 mm were produced by copper mold casting. The effect of alloying additions (Ni,Cu or Nb) on corrosion resistance of Fe55 Ni2 Cr2Mo10 B6 C13 Y2,Fe55Ni2Cr12Mo10B6C13Y2 and Fe55 Cu2 Cr12 Mo10 B6 C13 Y2 alloys was studied by polarization curves and electrochemical impedance spectroscopy (EIS). The results show that Fe55Ni2Cr12Mo10B6C13 Y2 and Fe55Cu2Cr12Mo10B6C13 Y2 alloys can be cast to form bulk metallic glasses. Fe55Ni2Cr12Mo10B6C13 Y2 and Fe55Cu2Cr12 Mo10B6C13Y2 amorphous alloys with passive potential about 1500 mV exhibit good corrosion resistance in NaCl solution of 5 % and 1 mol/L HC1 solution. The passive current density of the alloy with Ni addition is lower than that of other alloys. EIS results only show one impedance element. Amorphous alloy Fe55 Ni2 Cr12 Mo10 B6 C13 Y2 with larger charge transfer reaction resistance indicates good corrosion resistance.     

粉末锻造Fe–Ni–Cu–C–Mo齿轮材料热处理及性能研究

对Fe–Ni–Cu–C–Mo粉末锻造材料的锻后热处理工艺进行了研究,通过动态连续冷却转变试验绘制出该材料的连续冷却转变（continuous cooling transformation,CCT）曲线,指导材料锻后冷却工艺的选取。对Fe–Ni–Cu–C–Mo淬火试样进行不同温度的低温回火试验,探究不同回火温度对该材料微观组织与力学性能的影响。结果表明,当锻后冷却速率大于7.0 ℃·s?1时,Fe–Ni–Cu–C–Mo粉锻材料组织全为马氏体,硬度趋于稳定;在150 ℃和175 ℃回火,碳化物均匀地分布在马氏体板条内部,起到析出强化的作用,材料表现出优异的抗拉性能。     

利用氨浸渣生产工业钼酸钠

介绍了采用酸盐分解—碱浸—水洗—净化—浓缩结晶等过程从氨浸渣中回收钼并生产钼酸钠的工艺。实验结果表明钼的浸取率达到 80 % ,制备的工业钼酸钠符合Q/JDC1 0 2— 2 0 0 2标准 ,满足国内外用户的要求