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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Institute of Resources Recycling
Journal Basic Information
Journal DOI :
The Korean Institute of Resources Recycling
Editor in Chief :
Volume & Issues
Volume 5, Issue 4 - Dec 1996
Volume 5, Issue 3 - Sep 1996
Volume 5, Issue 2 - Jun 1996
Volume 5, Issue 1 - Mar 1996
Selecting the target year
Flocculation of Fine Particles of Kaolin in Water
Shin, Hong-Jun ; Shin, Kang-Ho ; Cho, Dong-Sung ;
Journal of the Korean Institute of Resources Recycling, volume 5, issue 3, 1996, Pages 3~8
The settling charaderist~aU I flocculation of Dae-mynng kaolin were studicd by measurrng the electropharetic mnhilbty and the light transmittance of suspensions with various concentrations of floccul;mnts, hydragcn inn and ~ I ~ c t r ~ l y t e s . Isoelectric points of kaolin occurred at pH 3.2. The fine particle cnagulation of kaolin \\'as achieved must cffcctivcly a1 the isoelcctric points. The optinurn flocculation of Accofloc was occurred when thc concentration w;o 4 ppm. and thc coagulation became greater in thc order of an~onic,n al>~aniacn d catiomc. The flocculation of Accofloc(C-4S2) \\,as more effective lhan that of Superfloc(C-577) No cffeectiveness was found whcn NaCl was added, hut flocculations oi nonionic and anionic were more effective when NaCl and flacculants werc added.
Production of Asphalt Concrete Used Iron-and Steelmaking Slage as Fillers
Ban, Bong-Chan ; Joo, Jae-Woo ;
Journal of the Korean Institute of Resources Recycling, volume 5, issue 3, 1996, Pages 9~16
The purpose of ths rescarch was to detcrmine a po\sihle application of the slag thc sliigs of iron-and steelmaking as afiller at asphalt concrete. The slags were crnshed for bcller recycling of lhree typical slags as ascon tiller. and thcn thcphysical and chemical properlies welt examincd The mechanical properliea of asphall cnncrete after filling with slagpowders under 200 mesh us fillers wcre tested to fulfill thc Korean Standnrds. Optimum tempcrafure of mixing the slagswith asphalt wils 140-160
C. The density, the stabilily. gap ratio and the samration degree were 2.37 glcm', 810 kg. 3.4"'||'&'||'and 80.4%, respectively.tively.
Physical Characteristics of E.A.F. Steel-making Slag
Hyun, Jong-Yeong ; Kim, Hyung-Seok ; Cho, Dong-Sung ;
Journal of the Korean Institute of Resources Recycling, volume 5, issue 3, 1996, Pages 17~23
The slag discharged from the E.A.F. Steel-making company I. contains ;~ppraxim;rtely 21% iron. 8% of the lron arccovered from the slag by hand-picking and lnagrlctlc scparatians. 13% af the unrecovered iron rrorn slag is discarded orused for roadbed and reclamation utilization. While most of tllz onrzc<~veredir on m in a s~mples tate of metal, a smallportion of the iron is in a combl~~estda te with alkalinc earlhs clcrnent. The unrecavcred and discarded iron can. Ihnetore,be recovered by a crushing separation technique and magnetic sepuratlon. Since the major componenl.; oi the slag consistsof FeO, CaO, SiO,, MgO and MnO, the slag can bc used as a flux for the steel-making induatly using scrap iron as rawmaterials. Thc slag can be used as heavy aggregates for constmction becausz the specific g~nvity of the slag is hlghcr thanlhal of ordinary aggregates. Far aggregates. the slag nceds a long aging periud. The non-metallic siag(meta1-removcd rlilg)can be used as the raw material for ccmcnt. The reulilizing both melallic and "an-metafllc slag requires the pleclse cant~olof gram m ea nd compancnts w~thrc spect to using purpose nf (he slaging purpose nf (he slag
Computer Simulation for Smelting Tretment of Waste Casting Sand
Chung, Won-Sub ; Min, Dong-Jun ; Kim, Yong-Ha ;
Journal of the Korean Institute of Resources Recycling, volume 5, issue 3, 1996, Pages 24~30
The computcr s~mulatiun model in vanaus s~nelllng process for melling waste cashhg sand was developed by using energy and malcrial balance concept. This modcl can prcdict the coal, flux and oxygen conaumptron and thc volume and temperature of off-gas The ~niljor critical varlablcs for smclting process can be crplained by using the analysis of energy and malc~ialb alance. Thc Innst lmportarlt variables lor smelting process were h i ~ hpo st-combust~anr atla, high heat transfer crficiency and refractory pratcclion lechnalogy. For saving encrg), in this smelting proccss, selection of caw marerials i.e coal, flus was important, cspacially ubi~go f low volatile coal was prufitahle.
Recovery of Copper from Sludge of Copper Electro-Plating Plant
Young-Gil Hwang ; Youn-Soo Kim ; Jae-Il Kim ;
Journal of the Korean Institute of Resources Recycling, volume 5, issue 3, 1996, Pages 31~36
The metallic copper was recovered from sludge of the copper electro-plating plant by pyrometallurgical process. The reducing agent was Pyrolysized from waste tires and the flux was a mixture
, and glass. The green sludge contained 87.5% moisture and 12.5% solid with 56.5% Cu and 1.59% Fe. The sludge dried at
was analyized to be
and CuO by XRD analysis. The former was 84% and the latter 16%, However, the calcined sludge at
and 51% CuO. The sludge could by smelted at
for two hours with 6 to 8 moles carbon with respect to copper to produce metallic copper (>90%) with recovery of 9% above.
Recovery of Metals from Printed Circuit Board Scraps by Shape Sorting Method
Lee, Jae-Chun ; Lee, Min-Yong ; Shigehisa Endoh ; Shin, Hee-Young ;
Journal of the Korean Institute of Resources Recycling, volume 5, issue 3, 1996, Pages 37~43
The recovery of metals from printed circuit board(PCBs) scraps was investigated by utilizing a shape sorting method.After all electronic parts mounted on the board were removed. PCBs were pulverized to particles smaller than 1 mm by aswing hammer type impact mill in order to liberate metal components. Metals were separated from nonmetalliccomponents by an inclined vibrating plate (IVP). The metal separation efficiency was measured as a function of vihrationintensity and inclined angle. The maximum efficiency was obtained when IVP was operated at the vibration intensity(Kv)of 1.40 and the inclined angle of 10". The grade of the metal components was recovered from PCBs exceeding 90% byusing IVP.0% by using IVP.
Removal of Unburned-Carbon from Fly-Ash of Bituminous Coal by Froth Flotation
Son, Sung-Geun ; Kim, Jung-Duk ; Park, Byung-Wook ;
Journal of the Korean Institute of Resources Recycling, volume 5, issue 3, 1996, Pages 44~49
One of the most serious problems in utilizing the fly-ash produced from damcstic coal-firing power plants is lhc unburned-carbon mntained m the fly-ash In this shldy, the effects of fruther and collector an the yield,recuvery,unburnedcarbon rejectiou peiccntage,and process efficiency of product (cleaned fly-ash) wcrc examined when convzntional froth flotation was applied to rejcct the unburned-carbon included in the fly-ash of bituminous coal Alsa,the ash analysis for both thc raw and the clcaned fly-ash was conducted to review the change in thc major elements of fly-ash. Experimental results shawcd lhat tlle rcjectlon oI the unburned-cubon of thc raw fly-ash sample is available upto 92.4% using fiath flotalian and that the putity ol the pmdud(c1eancd fly-ash) attains up to 99.4%.
Synthesis of Hydroxycalciumphosphate
Hwang, Young-Gil ; Kim, Youn-Soo ; Kim, Jae-Il ;
Journal of the Korean Institute of Resources Recycling, volume 5, issue 3, 1996, Pages 50~55
The synthesis of Ca,,(PO,),(OH), by adding (NFIa)J),HPO, to lhe solution of Ca(NO,), dlssolvad CaO in HNO, and contmlled pH with NH,OH was carried out for certain time at room temperahire and atmosphere. Ca,,(PO,),(OH), was rorrned at the range from pN 10 to pH 13. The particle s~zeof Ca,,(PO,),(OH)i was 0.1-0.5 &In. Thc optimum reaction lime was 30 min, and the temperature was 40-70
C. the shape also was not changed in spite of heating to iDVC hr 1 hour the c~ystalliratian temperature was 90
C Ca,,(PO,),(OH), was calcinatcd and the shape also was not changzd, in spile of hcaling to 500
C for 1 hour. But Ca,,(PO,),(OH), calcinated for lhour al 800
C was changed to the spheric particle of Ca,,,(PO,),(OH),, CaO and Ca,(PO,),.
Formation and Crystallization of Calcium Carbonate in
System by Ceramic Bubble Plate Reactor.
Ahn, Ji-Whan ; Park, Chan-Hoon ;
Journal of the Korean Institute of Resources Recycling, volume 5, issue 3, 1996, Pages 56~64
C,H,OH system is widely used for producing synthetic beverages and pharmaceuticals. Calcium hydroxide suspension was used to callhol the morphology of calcium carbonate, and the charactenstics of the formahan and crystsllizatian of calcium cilrbonate by adding ethylenc glycol were determined A reaclor was made with attaching a ceramic bubble plate, and lhe eleclrical conductivity was continously monitored during the rcaction with CO, gas. A part of the suspension was separated and powdered at the transition point. XRD and electron microscopic observation showed that the intermedmte and final products were vilterite, ;~r;lganite and calcite. In this study, the volumc of the ethylene glycol added to CH,OH was fixed a1 10 vol\ulcornerh. The valumc of the suspension was 500 ml, and the changes oi characteristics were shdied along with variims cnntents(l0-50 g) of calcium hydroxide. Except m the case of 10 g of calcium hydroxide at the crystallization stagc, all of products showed gelation. Tne marc the calcium hydroxide the shorter the formation time. Alsa. the farmalion of spherical valcrile ivas obsemcd when 30 g Ca(OH), was added. Tne vaterite(a compound material) can bc synthesised under alnbienl pressure and lempcmhre m a C,H,OH system by morphology control. Even though the vateritc was meta-stable phasc and could bc changed to calcitc easily, the stable and spherical vateritc was observed by using G5 glass fillers and vacuum dricrs.
Controlling Factors of Particle Size Distribution during Formation of Cubic and Colloidal Calcium Carbonate Compounds
Ahn, Ji-Whan ; Park, Chan-Hoon ;
Journal of the Korean Institute of Resources Recycling, volume 5, issue 3, 1996, Pages 65~72
Colloidal calcium wrbonate(diametcr 0.02-0 09 m~wja s developed to maintain the mamenl of pnriide formatio~>w ~lhoutsurlace trealment. The control factors of particle size and optimum condiliuna for compound fam*tition has not bccn studiedyet. This shldy war aimed at developing a method fur compounding colloidal calcium carbonfcte to cnl~hol cubic calciumcarbonate, and then compounding the b-o types oI precipitated calcium wrbonatc under optimum wndilrans Calc~umhydroxide was calcinated at 1, lWC far two hours, md then hydrated for 30 minutes at t i i O rprn and ambiznt temperahlle.Two-liter suspension was subjected to the contact with carbon dioxide at l5"C, 600 ipxn and C0= injection in the rate of 1 Umin Two types of dcium carbonate(cuhic calcium carbonatc(0 24.9 pm) md collnidd calcium mhnnate (0.02-0 09 pm))were compounded by "wing the concentrations of calcium oxide and ihe suspension were compounded. It was found that theoptimum concentrations of each suspensions were 5 wt % and 2.5 \I*.% respectively. ' h c key control factor af thc parlicle slzcdislribution was the concenkation al the suspension. The size of compounded particles was measured by a Zcla S k r 'fieaverage particle size of the cubic calcium carbonate aas 223.4 nm(0.223 pm), and that of thc colloidal a~lciumc arbonate was93.6 nm (0.093 km). Ihe particle sizc was evenly cantlolled on a stdblc basis in an H, O reaction system.asis in an H, O reaction system.