Phosphorus is an essential and non-substitutable element for the cellular processes of all living organisms. The main source phosphorus in biosphere phosphate rock. With more than 700 Mt rock, Estonia holds largest sedimentary rock deposits European Union. Estonian particularly outstanding due to its remarkably low content hazardous heavy metals such as Cadmium (<5 ppm) trace elements Uraniu...

This study aimed to explore concentration of a low grade sulfide-oxide lead-zinc sample containing 2.3% Pb, 1.91% Zn taken from Changarzeh mine, South Natanz, Iran. The effects of different parameters such as type and dosage of collector, milling retention time, dosage of sodium sulfur and its preparation time, application of sodium silicate, pH and solid content were investigated in relation t...

OBJECTIVES In urban settings, pedestrian fatalities and injuries are concentrated on major roads. This study aims to describe urban intersections with major roads (arterials and collector roads) and explore the association between intersection characteristics and injured pedestrians. METHODS From a stratified random sampling in Montréal, Quebec, 512 intersections were selected and their chara...

This paper is one of a study that implements reverse flotation methods as an alternative beneficiation on bauxite processing. aimed at decrease silica content and increase alumina in so its qualified feed Bayer Process. The experiments were carried out 1375 mL cell tank. Dodecylamine (DDA) AERO 3000C used the collector, starch depressant, Dowfroth 1012 frother. overall conducted solid to soluti...

The present investigation deals with the recovery of iron values from the screw classifier overflow slimes from an iron ore washing plant by means of reverse cationic flotation as an alternate to direct anionic flotation. Selectivity index, an indicator of separation efficiency, was chosen as the response parameter for optimizing the quantity and evaluating a series of generically same but chem...

This paper reviews the stability, heat transfer efficiency and photothermal conversion optimization studies of solid-liquid phase change materials applied to water heaters. Suggestions prospects were proposed. The study shows that PCMs are mostly filled in tank, thermal storage devices or solar collector heater system with paraffin wax, addition can significantly improve performance. Further in...

abstractthe purpose of this study was to investigate the controllable operating parameters influence, including ph, solid content, collector, co-collector, and depressant dose, and conditioning time, on apatite flotation kinetics. four first order flotation kinetic models are tested on batch flotation time-recovery profiles. the results of batch flotation tests and the fitting of first-order ki...

in this paper, the performance evaluation of a two-way hybrid photovoltaic/thermal (pv/t) solar collector was analytically and experimentally carried out. mathematical expressions for operating parameters in glass to glass and glass to tedlar pv/t solar collectors were developed and experimentally validated by a glass to tedlar pv/t solar collector system. also the influence of air flow rate on...

Copper oxide ore is an important copper resource. For a certain in Yunnan, China, experiments have been conducted on the grinding fineness, collector dosage, sodium sulfide inhibitor and activator dosage. The results showed that, by controlling above conditions, better flotation indices of are obtained. Additionally, ammonium bicarbonate ethylenediamine phosphate enhanced ore, whereas combined ...