The Effect of Milling Conditions for Dissolution Efficiency of Valuable Metals from PDP Waste Panels

Dharmaiah

et al. 2017

Self Cite

The objective of this particular study was to recover valuable metals from waste plasma display panels using high energy ball milling with subsequent acid dissolution. Dissolution of milled (PDP) powder was studied in HCl, HNO 3 , and H 2 SO 4 acidic solutions. The effects of dissolution acid, temperature, time, and PDP scrap powder to acid ratio on the leaching process were investigated and the most favorable conditions were found: (1) valuable metals (In, Ag, Mg) were recovered from PDP powder in a mixture of concentrated hydrochloric acid (HCl:H 2 O = 50:50); (2) the optimal dissolution temperature and time for the valuable metals were found to be 60°C and 30 min, respectively; (3) the ideal PDP scrap powder to acid solution ratio was found to be 1:10. The proposed method was applied to the recovery of magnesium, silver, and indium with satisfactory results.

Section: Experimental Processmentioning

confidence: 99%

Effect of Acid Dissolution Conditions on Recovery of Valuable Metals from Used Plasma Display Panel Scrap

Dharmaiah

et al. 2017

Self Cite

“…The powder was fabricated directly from elements by high-energy ball milling (HEBM) process at different milling time of 30, 60, and 90 min. HEBM is a powerful and effective process method, which can fabricate alloy powders from raw elements in a short period of time [18]. Then as-milled powders were consolidated by spark plasma sintering (SPS) at 450 • C, under pressure of 50MPa holding for 5 min in a vacuum.…”

Section: Methodsmentioning

confidence: 99%

Microstructure And Thermoelectric Properties Of Tags-90 Compounds Fabricated By Mechanical Milling Process

Kim¹,

Madavali²,

Hong³

2015

TAGS-90 compound powder was directly prepared from the elements by high-energy ball milling (HEBM) and subsequently consolidated by a spark plasma sintering (SPS). Effect of milling time on the microstructure and thermoelectric properties of the samples were investigated. The particle size of fabricated powders were decreased with increasing milling time, finally fine particles with ∼1µm size was obtained at 90 min. The SPS samples exhibited higher relative densities (>99%) with fine grain size. X-ray diffraction analysis (XRD) and energy dispersion analysis (EDS) results revealed that all the samples were single phase of GeTe with exact composition. The electrical conductivity of samples were decreased with milling time, whereas Seebeck coefficient increased over the temperature range of RT∼450 • C. The highest power factor was 1.12×10 −3 W/mK 2 obtained for the sample with 90 min milling at 450 • C.

“…According to Universal Act in USA, SFLs can be controlled to recycle and manage safely and merchandise containing mercury has been prohibited to produce except fluorescent lamp. In USEPA, high mercury wastes such as PDP, battery, and lamp are classified by total mercury content which should be greater than 260 mg/kg [3][4][5]. MRT System developed by Lumalampan, Sweden was separated mercury from SFL by distillation operation since 1979.…”

Section: Introductionmentioning

confidence: 99%

Comparison Of Mercury Distribution Between The Types Of Spent Fluorescent Lamp

Rhee¹,

Park²,

Choi³

2015

Spent fluorescent lamps(SFLs) such as linear type lamp, compact type lamp and U-type lamp are used to estimate mercury distribution in the components of lamps. Determination of mercury concentration in the components of spent fluorescent lamp is performed by the DMA method. Mercury concentration in the components of spent fluorescent lamp can be varied with the manufactures of lamp. Mercury portion in phosphor powder and glass from any types of spent fluorescent lamp is estimated to be higher than 99% by the analysis of mercury distribution. Through mercury distribution in the components for SFLs, the mercury concentration in phosphor powder is much higher than that in other components regardless of the type of lamp. Hence, it is desirable that phosphor powder of spent fluorescent lamps should be controlled separately and safely.