... that the flow velocity, solid volume concentration and pipe inner diameter have significant impacts on water-hammer pressure. These results can provide references for deep-sea mining system design and safety evaluation. pressure attenuation trend water hammer continuity equation mining system...

... hydraulic gradient spatial configuration upstream oil & gas transportation parameter metals & mining buffer pressure drop pipe configuration concentration formula mining system pipeline mining collector Spatial Configurations and Particle Transportation Parameters of Flexible Hose...

... hydrate inhibitors were designed for drilling deep-sea wells located at different water depth. flow assurance initial hydrate formation temperature curve concentration deep-sea drilling pvcap khis catastrophic hydrate formation hydrate inhibition performance test vva seabed condition...

... into the intervals with higher gas contents. In the meanwhile, hydrocarbon concentrations in headspace gases within the faults or fracture zones are higher than those above the faults or fracture zones. This may suggest that faults or fracture zones have great impact on gas hydrate occurrences. Further comparative...

... content by precipitation method at pH.3.95, prior to solvent extraction of rare earth metals using D2EHPA as extractant. Effect of equilibrium pH, equilibrium time and D2EHPA concentration was carried out to establish a suitable condition for effective extraction of total rare earth metals. Eq. pH...

... ABSTRACT Leaching of total rare earth metals from the sea nodule was carried out using H 2 SO 4 solution. Existence of phase of rare earth metals in the sea nodule was confirmed while leaching with different reagents. Concentration of H 2 SO 4 and temperature are found to be critical factors...

... mixture flow in vertical pipe for mixture velocity range from 1.5 m/s to 3.5 m/s, mean volume concentration of solids was about 5%. KEY WORDS: Slip velocities, vertical flow, mixtures, radioisotope, pipeline INTRODUCTION Hydraulic pipe transport is one of the basic systems of transporting nodules from...

... measurements at upward flow in a pipeline of D=150mm. The slip velocity values measured for 10-,30- and 50- mm diameter nodules at the volume concentration 10% are of the same order as the fall velocity of these solids. Yoon and Kang [2008] have performed the experimental studies of solid-liquid flow with real...

... ABSTRACT The use of hydraulic transport during the extraction of nodules from the seabed will need constant monitoring of speed and concentration of solid grains in a vertical pipeline. In that case the most important is the measurement in the begin part of the pipeline exposed to high...

... separation seafloor ore separation japan diameter concentration formula consideration Consideration of Seafloor Ore Separation by Slurry Flushing for Seafloor Massive Sulfide Mining T. Yamazaki, Y. Yamamoto, R. Arai and N. Nakatani Osaka Prefecture University Sakai, Japan ABSTRACT Seafloor massive...

... ABSTRACT During pyro-reduction smelting of manganese deep sea nodules from the Clairon Clipperton zone in the Pacific Ocean the copper, nickel and cobalt are concentrated in intermediate product - polymetallic alloy. Characteristic property of the alloy is its high content of iron (65.90...

... ABSTRACT The effect of slurry velocity and concentration on the coarse-grained particle-water mixtures flow behavior and pressure drops was studied in horizontal and inclined pipes of inner diameter 100 mm. The study revealed that the coarse-grained particle-water mixtures were significantly...

... wastewater has been assessed. Factors such as adsorption time, temperature, initial NH4+ concentration, solid to liquid ratio and pH value, were investigated respectively. The absorption isotherm also was obtained. Under the conditions of temperature 20 °C time 24 hours, particle size -200 mesh accounting...

... ammonia leaching was carried out, in which the copper ion leached out of the raw materials, the Co-Mn polymetallic ores, was taken as the catalyst and CO as the reducing agent. The concentration of copper in the leaching solution has great effect on the oxidation-reduction reaction rate, and the reaction...

... column and seafloor effects. This paper concentrates on the fluid tailings and their discharge back into the sea. We also address potential environmental effects of large-scale environmental impact experiments in due time before industry conducts pilot mining operations, as well as the disposal of mud...

... for fine-grained sand. The investigation was focused on evaluating the effect of slurry velocity and particle concentration on pressure drops and the slurry flow behavior in the turbulent regime. Also the effect of fine-grained particle addition on slurry behavior is described. INTRODUCTION The poly...

...(II) with solution pH-2.0. Molybdenum concentration in leach liquor is relatively low as compared to the other metals and limited studies are reported for its recovery (Monhemius, 1986). However, this low molybdenum content of the leach liquor can be enriched to a desired concentration by solvent...

... and local occurrence, concentration and form, and methods for exploitation. Since MH exists only under very restricted conditions, it is difficult to determine their presence and properties by drilling, or to bring undisturbed specimens to laboratory for testing. A more promising method of locating...

... ABSTRACT: Fluidization is one of fundamental relative motion forms in solid-liquid two-phase flow. The fluid velocity, particle concentration, etc. are important parameters in engineering design. Proper parameters could avoid pipeline clog, and increase transport efficiency. With single...

... in seawater, and mooring system for adsorbent components. The results presented in the paper focus primarily on the adsorption efficiency involved with uranium and lithium. INTRODUCTION About 70% of all elemental ions can be found in seawater, albeit at low concentrations. The concentration of typical rare...