从废镍催化剂中回收镍并生产硫酸镍

试验了从废镍催化剂中回收镍并生产硫酸镍。废镍催化剂用硫酸溶解并去除硅酸之后,通过碱析获得粗硫酸镍产品,再通过净化、二次碱析及结晶,获得纯度较高的NiSO4.7H2O产品。该方法可从废镍催化剂中充分回收镍资源,并对环境有利。     

硫氰酸盐分光光度法测定废催化剂中钨含量

采用硫氰酸盐分光光度法测定废催化剂中钨含量,存在样品难分解、流程复杂等问题。实验采用盐酸-硝酸-高氯酸混合酸分解样品,加入氢氧化钠使铁、锰、钒、镍、铜等元素形成沉淀,而钨以钨酸盐形式存在于溶液中以达到分离,用氯化亚锡-三氯化钛作还原剂,在盐酸介质中,将钨(Ⅵ)还原为钨(Ⅴ)与硫氰酸盐形成黄色的络合物,建立了硫氰酸盐分光光度法测定废催化剂中钨的分析方法。实验表明:钨的质量浓度在2.0～12.0μg/mL范围内与其对应的吸光度符合朗伯比尔定律,相关系数为0.999 8。将该实验方法用于测定4个废催化剂样品中钨含量,测定结果的相对标准偏差(RSD,n=7)在0.54%～1.99%之间。按照该实验方法测定4个废催化剂样品中钨,测定结果与电感耦合等离子体原子发射光谱法(ICP-AES)测定结果一致。     

熔盐电解稀土用钨电极的制备工艺研究

采用适当的含镍化合物及相应的加入方式制备镍包钨粉,微量镍可在钨颗粒表面均匀包覆;镍包覆钨粉经活化烧结生产的致密钨棒用于稀土电解的阴极,较传统的钼阴极具有更强的抗腐蚀性。用质量分数为0.4%的微量镍包覆钨粉,可实现在低于1 500℃温度下烧结出相对密度大于90%的致密钨材。该钨电极制备工艺具有流程短、生产成本低、质量稳定等特点。     

废SCR脱硝催化剂钒钨提取研究进展

含有钒、钨和钛的选择性催化还原催化剂在许多工业应用中被广泛还原氮氧化物。各行业脱硝催化剂正在进入报废更换高峰期,处理废催化剂回收有价金属迫在眉睫。将回收的钒、钨、钛用于生产新型催化剂或其他产品,可形成循环经济。对废脱硝催化剂钒钨提取工艺进行详细综述,重点介绍钒钨浸出和钒钨分离方法。     

利用废钨-镍型催化剂制备钨酸钠工艺研究

以废钨-镍型加氢催化剂为原料,采用钠化焙烧-浸出-离子交换工艺制备钨酸钠.实验结果表明:当催化剂研磨粒度为0.15 mm,Na2CO3相对于WO3的用量比为0.69,浸出温度90℃,浸出时间1h时,废催化剂中钨的浸出率可达99％;采用串柱吸附方式,WO3的饱和交换容量为332.9 gwo3／L干树脂;以2 mol/L的NaCl和1 mol/L的NaOH混合液作解吸剂,钨解吸率为98.2％;经过重结晶的钨酸钠产品纯度达到99％.     

硫氰酸盐分光光度法测定镍基合金中钨

应用硫氰酸盐分光光度法测定镍基合金试样中钨时,存在镍基合金较难溶解的问题,同时样品中较高含量的镍会干扰钨的测定。实验采用硝酸-氢氟酸混合酸溶解试样,通过加入氢氧化钠使其与基体镍反应生成氢氧化镍沉淀的方法实现了镍与钨的分离,然后用氯化亚锡作还原剂,在盐酸介质中,将钨被还原为钨(Ⅴ)与硫氰酸盐形成黄色配合物,建立了硫氰酸盐分光光度法测定镍基合金中钨的方法。实验表明,显色液中钨的质量浓度在0.096~19.24μg/mL范围内符合比尔定律,相关系数R~2=0.999 6。方法的检出限为0.025%,测定下限为0.084%。将实验方法用于测定两个镍基合金样品中钨,结果的相对标准偏差(RSD,n=6)小于0.50%。按照实验方法测定6个镍基合金样品中钨,结果与电感耦合等离子体原子发射光谱法(ICP-AES)测定结果相一致。     

离子交换法回收废钨催化剂碱浸液中钨的研究

用201树脂离子交换回收废钨催化剂碱浸液中钨,研究了交前液流速、温度及所含阴离子杂质对钨吸附的影响和不同解吸剂解吸钨的影响。结果表明,交前液的流速从2．0mL／min增加到8．0mL／min,WO3的饱和交换容量从332．9mg／g减少到150．9mg／g。当交前液含10g／LAlO2、10g／L,CO3^2-和5g／L OH^-时．饱和交换容量相应减少为169．2、201．6和231．04mg／g。用2mol／LNaCl和1mol／LNaOH的混合液解吸效果好,解吸率可达98．2％。     

从废催化剂中回收钼的研究

研究了从含钼、镍废催化剂中回收钼的方法及生产工艺流程.该流程简单,生产效益高.钼产品质量达到了国际标准,钼回收率大于90%.     

镍在氯水溶液中的浸出特性及其从废催化剂中回收镍的应用

镍在氯水溶液中的浸出特性及其从废催化剂中回收镍的应用ＰａｍｅｌａＡｌｅｘ等氯水溶液￣［１］可作为从各种硫化物、氧化物及金属资源中溶解有价贱金属的有效浸出剂。就应用该浸出剂处理镍的氯化物资源而论，至今只有Ｒｏｏｒｄａ和Ｑｕｅｎｅａｕ作过报道￣［２］，他...     

不同基底非晶态镍钨合金电沉积中氢的作用

研究了三种材质基底上非晶态镍钨合金电沉积过程中阴极析出氢的影响。结果表明，玻璃碳中氢的吸收不可能发生，钯中氢的扩散和吸收是迅速的，镍的行为介乎其间。在玻璃碳上可以生成平整的、厚度较大的、有金属光泽的镍钨镀层，镍是也发现了沉积物，而钯上没有任何新相沉积，由此肯定了氢在镍钨合金诱导共析过程中的重要性。     

Preconcentration of Nickel Values from Lateritic Chromite Ore Overburden,Sukinda, Orissa,India

The nickeliferrous chromite ore overburden of Sukinda, Orissa, contains about 0.55% Ni, and forms an important resource for nickel in India. This deposit has hitherto evaded exploitation because of its lean grade and complex mineralogy. The techno-economics of the metallurgical extraction process developed for recovering nickel from this laterite requires a minimum of 1% Ni; hence there is need for preconcentration. This paper presents the results of batch and semi continuous pilot plant scale preconcentration studies carried out on a representative overburden sample. Two alternative flowsheets involving classification and classification-flotation were developed for preconcentrating the nickel rich iron oxide fines (?37 µm). The first flowsheet gave preconcentrate analysing 1% Ni with 50% recovery and with the use of a hydrocyclone of d₅₀(, =30 µm, it should be possible to increase the recovery to > 60%. The second flowsheet gave a preconcentrate analysing 1% Ni with 65% recovery.     

加纳共和国某金矿选矿工艺流程试验研究

对加纳共和国某金矿选矿工艺流程进行了试验研究。试验结果表明,采用重选(摇床)—浮选工艺流程,金重选回收率达88.58%,总回收率可达到95.26%。该工艺流程简单易行,对环境友好。     

Research on the preparation and shielding properties of W–Ni–Fe alloy material by liquid phase sintering

Traditional and single shielding material has not satisfied the demand for radiation protection. Shielding materials with a good comprehensive performance have attracted attention. W–Ni–Fe alloys with different Ni/Fe ratios have been prepared through liquid phase sintering using W, Ni and Fe elementary powders. The microstructure, morphology and fracture appearance of such prepared W–Ni–Fe alloys with different Ni/Fe ratios were analysed with the SEM and metallographic test. The effects of the Ni/Fe ratio on the density, microhardness, tensile strength and shielding efficiency were investigated. The results show that for W–Ni–Fe alloys with different Ni/Fe ratios, the alloy surfaces are composed of ellipsoidal W particles on a Ni–Fe substrate. However, when the Ni/Fe ratio is 7:3, uniform and spherical W crystals are embedded in the Ni–Fe substrate and evidently form dense boundaries, which contribute to the good mechanical properties and shielding effect of the alloy.     

铝活化烧结钨的组织形貌和性能分析

本文通过实验探讨了铝对钨的活化烧结行为,并应用扫描电镜(SEM)分析了样品组织形貌,结果表明,由于Al的加入使钨的致密度得到显著提高。     

乌拉嘎金矿尾矿中金回收工艺试验研究

对乌拉嘎金矿老尾矿分别进行了氰化、浮选及氰化与浮选联合工艺流程回收金试验研 究.通过确定合理的工艺流程结构及工艺条件,获得了金总回收率达65％以上试验指标,为合理开发回收该尾矿资源提供了技术依据.     

从瑶岗仙钼铋金属矿体中回收钼铋的浮选试验研究

文章通过对瑶岗仙钼铋金属矿体钼铋浮选条件试验和闭路试验研究,可从含Mo 0.011%,含Bi 0.052%给矿中得到含Mo 0.992%,Bi 4.20%,回收率分别为75.23%和74.94%的混合精矿。对混合精矿进行浮选分离得到含Mo 45.66%,作业回收率为88.80%的钼精矿和含Bi 29.55%,作业回收率为90.20%的铋精矿。     

离子交换法从解钼液中富集回收钨钼

考察了用Ｄ３５４树脂从解钼液中回收钨钼的情况。在ｐＨ＝３，接触时间为４０ｍｉｎ时，Ｄ３５４树脂能吸附９７％以上的钨钼，钨钼共吸附的饱和吸附容量可达０．２３８ｍｏｌ／Ｌ湿树脂；用１０％ＮａＯＨ做解吸剂，解吸效果很好，解吸液中ＷＯ３和Ｍｏ的最大浓度分别是可达１００ｇ／Ｌ和３６ｇ／Ｌ；树脂用碱性次氯酸钠再生，盐酸转型后，重复使用性能稳定。     

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。     

Thermodynamics of the superalloys

Using the parameters of Kaufman and Nesor, we have calculated the activities of Al, Ti, Cr, Fe, Co, Ni, Mo, and W in 17 superalloys. These components behave in three distinctly different ways: Al and Ti have very.small activity coefficients; Fe, Co, and Ni have activity coefficients close to unity; and Cr, Mo, and W have activity coefficients of approximately 10. The calculated free energy of formation of the gamma prime in these alloys gives values similar to that for pure Ni3Al. The calculations of the free energy change for the formation of a Cr-Co sigma phase gives a lower estimate of the potential for sigma formation. These results show that the presently available thermodynamic representations and parameters are capable of providing useful information on very complex systems.