共查询到19条相似文献,搜索用时 125 毫秒
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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。 相似文献
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《中国钨业》2020,(1):72-76
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。 相似文献
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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。 相似文献
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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%. 相似文献
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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。 相似文献
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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%。 相似文献
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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... 相似文献
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K. ANAND RAO T. SREENIVAS R. NATARAJAN N. KRISHNA RAO 《Mineral Processing and Extractive Metallurgy Review》2013,34(1-4):37-45
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. 相似文献
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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. 相似文献
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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. 相似文献
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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。 相似文献
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离子交换法从解钼液中富集回收钨钼 总被引:5,自引:0,他引:5
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。 相似文献
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R. O. Williams 《Metallurgical and Materials Transactions A》1982,13(6):959-965
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. 相似文献