Leaching behaviour of a galvanic sludge in sulphuric acid and ammoniacal media

Silva, João Eudes da; Soares, Delfim; Paiva, Ana Paula; Labrincha, J.A.; Castro, F.

doi:10.1016/j.jhazmat.2005.02.008

Cited by 81 publications

(38 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The optimum conditions are: L/S of 3:1, pH of 10.8~11.2, ammonia concentration of 20%, extraction time of 1.5 h, stirring speed of 2000 rpm, and four stages of extraction. Impurities such as Mg, Zn, and Al hardly leached, and reported to leaching residue [26]. These experimental results lay a good foundation for future studies into the recovery of copper and nickel.…”

Section: Effect Of Leaching Parameters On the Extent Of Leaching Of Cmentioning

confidence: 57%

Highly Selective Copper and Nickel Separation and Recovery from Electroplating Sludge in Light Industry

Xu¹,

Liu²,

Zhu³

et al. 2015

Pol. J. Environ. Stud.

View full text Add to dashboard Cite

Chemical precipitation is the most common treatment process for the removal of heavy metals from wastewater [1,2]. Electroplating sludge (EPS) is a heavy metals-bearing byproduct of the electroplating industry. Most EPS produced by electroplating is a mixture consisting of various metals such as copper, nickel, zinc, iron, and chromium, in a complicated liquid-solid mixture [3]. Some of these heavy metals have relatively high densities, and are poisonous in low quantities. EPS is recognized worldwide as hazardous waste [4]. Spreading EPS on fields drastically increases the heavy metal content of the soil, and associated risks of groundwater pollution, increased toxic metal mobility, plant toxicity, and metal contamination throughout the food chain [5,6]. Consumption of heavy metal-contaminated foods is associated with suppression of the immune system, reduced fertility, and even acute poisoning at high concentrations [7]. Inappropriate treatment of EPS poses hazards to humans, animals, fish, the environment, and the wider ecosystem. This also represents results in considerable waste of valuable resources. In China, more than 100,000 tons of valuable heavy metals are lost every year in the Pol. J. Environ. Stud. Vol. 24, No. 1 (2015), 367-374 AbstractElectroplating sludge and associated waste products comprise complex mixtures of metallic elements and may cause serious environmental pollution if discharged without treatment. An effective light industrial process is modified to selectively extract and recover copper and nickel from electroplating sludge. The procedure was developed on a laboratory scale and validated in a small pilot plant. Extraction yields of greater than 95% for Cu and Ni are achieved under optimum leaching conditions. To selectively recover copper and nickel from the leaching solution, they were extracted by N902 in kerosene, followed by selective stripping using sulfuric acid. The overall recoveries of copper and nickel were 93.6% and 88.9%, respectively, via a fast, simple, and inexpensive process. Partial recovery of ammonia in the process enables some cost savings. The technology can be used for metal resource recovery from solid wastes containing copper and nickel.Keywords: ammonia/ammonium leaching, copper, nickel, electroplating sludge, resource reuse *e-mail: xujick@tongji.edu.cn **e-mail: ligm@tongji.edu.cn DOI: 10.15244/pjoes/28353 form of EPS [8]. To ensure environmental protection and sustainable development, achieving recovery and recycling of heavy metals from EPS economically is of great importance.In recent decades, conventional methods for the recovery of valuable metals focused on leaching [9-11] and solidification technologies [12][13][14]. However, when acid leaching is applied to EPS, Cu, Ni, Zn, Cr, and Fe all dissolve into the leaching solution [3,15], which makes subsequent separation of the metals difficult. Mineral acids are also strongly corrosive, and readily corrode the equipment used, which increases process costs. Selective separation and recovery of valu...

show abstract

Section: Effect Of Leaching Parameters On the Extent Of Leaching Of Cmentioning

confidence: 57%

Highly Selective Copper and Nickel Separation and Recovery from Electroplating Sludge in Light Industry

Xu¹,

Liu²,

Zhu³

et al. 2015

Pol. J. Environ. Stud.

View full text Add to dashboard Cite

show abstract

“…This author concluded that alkaline leaching is much more selective, but the overall efficiency in valuable metals extraction is low. Silva et al [12] published a comparison between acid and alkaline media in galvanic sludge leaching and the conclusions were similar.…”

Section: Introductionmentioning

confidence: 78%

Galvanic sludge metals recovery by pyrometallurgical and hydrometallurgical treatment

Rossini

Bernardes

2006

Journal of Hazardous Materials

View full text Add to dashboard Cite

“…All the leach samples (referenced therein as samples A-E) were generated from sulphuric acid leaching of a polymetallic complex sludge using a 100 g/L sulphuric acid solution and a liquid to solid ratio (L/S) of 5:1 [24]. The sludge was produced by the physicochemical treatment of wastewaters from a Ni/Cr plating plant located at Braga, in the north of Portugal.…”

Section: Generation Of Leach Samplesmentioning

confidence: 99%

Solvent extraction applied to the recovery of heavy metals from galvanic sludge

Silva

Paiva

Soares

et al. 2005

Journal of Hazardous Materials

149

View full text Add to dashboard Cite

In this study, a hydrometallurgical treatment involving the solvent extraction and recovery of some heavy metals from a sulphuric acid leach solution of galvanic sludge, using di-(2-ethylhexyl)-phosphoric acid (D2EHPA) and bis-(2,4,4-trimethylpentyl)-phosphinic acid (Cyanex 272), both diluted in kerosene, has been investigated. The preliminary tests revealed the necessity to remove other metal species than zinc and nickel, contained in the leach solution, and therefore, processes to cement copper and precipitate chromium were then applied to finally obtain a Zn and Ni pregnant solution prior to solvent extraction. For the experimental conditions studied, Cyanex 272 showed a good recovery of Zn after the stripping stage using H2SO4, but D2EHPA effectively promoted a higher Zn extraction than Cyanex 272 did. The dependence of the solvent extraction method on variables such as pH, contact time and concentration of extractant, as well as the effect of different concentrations of sulphuric acid on stripping, are discussed. The discussion also includes the previous conditions developed to separate the main interfering metallic species from the leach solution in order to improve the extraction and recovery of zinc by solvent extraction. The final objective has been to achieve a solution as pure as possible to recover nickel sulphate.

show abstract

Leaching behaviour of a galvanic sludge in sulphuric acid and ammoniacal media

Cited by 81 publications

References 15 publications

Highly Selective Copper and Nickel Separation and Recovery from Electroplating Sludge in Light Industry

Highly Selective Copper and Nickel Separation and Recovery from Electroplating Sludge in Light Industry

Galvanic sludge metals recovery by pyrometallurgical and hydrometallurgical treatment

Solvent extraction applied to the recovery of heavy metals from galvanic sludge

Contact Info

Product

Resources

About