Wyniki wyszukiwania - BazTech

1

Concentration of chromite by means of magnetic carrier using sodium oleate and other reagents

Ucbas Y., Bozkurt V., Bilir K., Ipek H.

Physicochemical Problems of Mineral Processing

|

2014

|

Vol. 50, iss. 2

767--782

EN

Chromite recovery was studied using a magnetic carrier technology. Heavy media grade magnetite was used as the magnetic carrier. The effect of various reagents such as sodium oleate (NaOl) as a collector and carboxymethyl cellulose (CMC) as well as quebracho tannin as depressants on chromite removal was investigated. The effects of pH and reagent dosages were also determined. First, the zeta potential measurements were performed for different minerals in the absence and presence of NaOl, and then magnetic carrier tests were carried out under conditions based on zeta potential measurements. The magnetic carrier tests performed in the case of individual minerals (i.e. single minerals) showed that chromite (recovery of 95.1%) could be separated from serpentine (recovery of 3.2%) whereas it could not be separated from olivine. The best chromite concentrates containing 42.1% Cr2O3 were obtained with a 76% recovery from a synthetic mixtures of chromite and serpentine under optimum test conditions, that is at pH 10.5, 5.10–5 M NaOl, 20 g/Mg CMC, 0.5 g magnetite and 500 g/Mg kerosene (the feed contained 27% Cr2O3). Slime tailings of Turkish Maadin Company, Kavak Chrome Concentrating Plant in Eskisehir, which contain fine chromite, serpentine and olivine, were also investigated. It was found that chromite could not be satisfactorily recovered from the original slime sample in the presence and absence of NaOl by using the magnetic carrier technology. Additional FTIR studies performed with the investigated minerals showed that NaOl adsorption on chromite was greater than that on serpentine and magnetite minerals. It was also found that NaOl adsorption on serpentine is significantly reduced in the presence of magnetite while it increases only slightly on chromite.

2

Effect of heat treatment on breakage rate function of ulexite

Ipek H., Sahan H.

Physicochemical Problems of Mineral Processing

|

2013

|

Vol. 49, iss. 2

651--658

EN

The kinetics of batch grinding and heat treated of ulexite using different size fractions (–3350+2360, –2360+1700, –1700+1180, 1180+850, –850+600, –600+425, –425+300, –300+212 and – 212+150 micrometers was determined using a standard Bond ball mill. It was found that breakage of ulexite follows the first order behavior for all feed sizes with the correlation coefficients equal to approximately 98%. The dry grinding of the single-sized fraction and heat treatment of ulexite showed that heat treatment samples were ground much faster than the original ulexite samples.

3

Determination of grindability characteristics of zeolite

Ipek H., Goktepe F.

Physicochemical Problems of Mineral Processing

|

2011

|

Vol. 47

183-192

EN

In this study grindability of zeolite was studied. The work index of zeolite was determined for three different test sieves. In terms of work indexes, there was insignificant difference between the test sieves. Additionally, the breakage rate and distribution parameters were also determined. The fastest breakage rate was obtained for -1700+1180 µm feed sizes and found breakage distributions functions were non-normalisable.

4

Beneficiation of quartz waste by flotation and by ultrasonic treatment

Goktepe F., Ipek H., Goktepe M.

Physicochemical Problems of Mineral Processing

|

2011

|

Vol. 47

41-50

EN

Quartz is one of the most important industrial minerals used in glass and ceramic industries and high quality quartz are preferred. Impurities from quartz are usually removed by magnetic separation or flotation. This study is concerned to beneficiate the quartz from the quartz plant waste from Aydin-Çine region in Turkey by flotation and by ultrasonic bath treatment. The material with 94.8% Si is removed as a waste in the plant, after washing, grinding and classifying were applied. Flotation experiments showed that SiO2 content increased to 98.3% with 80% recovery after removing the -53 micrometer size fraction by desliming. When ultrasonic bath treatment is applied the SiO2 content increased from 94.8% to 99.2% after - 106 micrometer (30%) was removed as a slime. Results showed that better results were obtained with ultrasounic treatment. The aim of this study is to recover the quartz from waste and to add an economic value and therefore to reduce the waste stock for the environmental concern.