The applicability of centrifugal force multigravity separator (MGS) to concentrate fine fractions (20?1 mm) of a low grade chromite ore assaying 9?3%Cr 2 O 3 was investigated. The metal screen analysis revealed that 83?92% of the material prepared for tests was in the z0?106 mm fraction containing 8%Cr 2 O 3 and that 16?08% was in the 20?106 mm size fraction containing 16?12%Cr 2 O 3 . The z0?1 and 20?1 mm fractions of the ore was used as feed for shaking table and MGS tests respectively. The results gathered from shaking table test were not satisfactory due to low Cr 2 O 3 recoveries. However, a chromite concentrate with 46?22%Cr 2 O 3 grade and 66?1 wt-%Cr 2 O 3 recovery was obtained by the combination of shaking table and MGS. It was clearly demonstrated that MGS is an ideal beneficiation equipment for fine fractions of a low grade Cr 2 O 3 ore. Based on the experimental results, a principal flowsheet for the enrichment plant was proposed.
Experimental compositions were prepared by the additions of ulexite concentrator waste to a standard wall tile body sintered at different temperatures. Tests of linear firing shrinkage, water absorption, and fired bending strength (eğilme mukavemeti) were done. XRD analyses were conducted to determine major crystalline phases in wall tile bodies. SEM-EDX analyses were performed to study the microstructural evolution of the standard and experimental wall tile bodies. Colorimetric analyses were also made. The wall tile body containing 5 weight percent ulexite concentrator waste fired at 925 o C for 6 minutes was determined to be the optimal composition with 0.60% of linear firing shrinkage, 17.66% of water absorption, and 208.60 of kg/cm 2 fired bending strength (eğilme mukavemeti). Sintering temperature was reduced from 1182 o C of industrial practice down to 925 o C. Utilization of ulexite concentrator waste in tile bodies will help reduce energy costs in favour of the environment and economy.
ÖzÜleksit konsantratör atığının standard duvar karosu bünyesine katılması ve değişik sıcaklıklarda sinterleşmesiyle deneysel numuneler hazırlanmıştır. Doğrusal pişme küçülmesi, su absorpsiyonu ve pişme bükülme testleri yapılmıştır. X-ışınları kırınım analizleri duvar karolarının kristal fazlarını tayin etmekte; SEM-EDX analizleri standard ve deneysel duvar karolarının mikro yapılarındaki değişimlerin anlaşılmasında kullanılmıştır. Renk analizleri de gerçekleştirilmiştir. 925°C de 6 dakika pişirilen %5 üleksit konsantratör atığı %0.6 doğrusal pişme küçülmesi, %17.66 su emme ve 208.6 kg/cm 2 pişme bükülmesi değerleriyle optimum konsantratör atık derişimi olarak belirlenmiştir. Endüstriyel üretimde 1182°C olan sinterleşme sıcaklığı 925°C'ye düşürülmüştür. Üleksit konsantratör atığının duvar karolarında kullanımı enerji maliyetlerini düşürmeye yardım ederek ekonomi ve çevreye yarar sağlayacaktır.
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