More recently, Leistner et al. Measures for controlling the backfill body compaction for reducing the amount of energy released from mining rocks were proposed. Figure 14 shows a schematic view of froth cleaning with wash water in the presence and absence of locked particles. Even before the 16th century, schemes of assaying measuring the value of ores were known, using procedures that do not differ materially from those employed in modern times. To enhance the formation of the froth we had chemicals called frothers, which are surfactants like detergents which help to create small bubbles and stable froth layer at the surface. Separator 25 is preferably a cyclone separator that separates the coal and gangue material as from the gas stream. Ordinarily, however, it is economically advantageous to employ the mixed and relatively impure alcohols such as those formed by the oxo process or any of the processes documented in patents such as U.
Accordingly, this study illuminates that the occurrence of physisorption phenomena between cellulose and the minerals and efficient particle-bubble attachment depend on electrostatic interactions between them. If desired, the effluent gases may be treated by suitable steps, such as scrubbing, to remove sulfur-containing gases and the like. The beds in the tower, or scrubber 31 may be Raschig rings, Beryl Saddles, or the like; or sprays may be used instead. Dispersing reagents are surface charge modifiers. The settling velocity separator may be a quiescent type separator in which laminar flow allows the denser particles to settle from the slurry; or it may be a cyclone separator, or a centrifuge employing the accelerated settling velocity principle for separation. In fluorescence spectroscopy, a sample bombarded with X rays gives off fluorescent X-radiation of wavelengths characteristic of its elements. These methods need not be described in detail herein.
The cylinders are pressed together under high pressure, so that comminution takes place in the material bed between them. Wash water can also prevents overloading, which inhibits drainage, by lightening the froth and allows the concentrate to be pulled harder. Sampling is the removal from a given lot of material a portion that is representative of the whole yet of convenient size for analysis. This paper investigates the effect of energy input on the flotation of quartz in an oscillating grid flotation cell. This assessment revealed that about 2 wt% Leu was adequate to provide best overall dispersibility. Success requires that the feed particles fall within a special size spectrum 0.
The gangue materials that were freed were freed as discreet particles and remained sufficiently large in size to exhibit relatively high settling velocities resulting from the size, higher density and particle sphericity roundness so as to be effectively separated from the lower settling velocity carbonaceous material. The rising current, entrainment dryer also will effect some oxidation of sulfur-bearing minerals and organic material and, subsequently, some reduction in sulfur content of the carbonaceous fuel. Although conventional methods of chemical analysis are used today to detect and estimate quantities of elements in ores and minerals, they are slow and not sufficiently accurate, particularly at low concentrations, to be entirely suitable for process control. . Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.
From a pragmatic point of view, there is a particularly urgent need for processes to accomplish the foregoing economically and with higher efficiencies from the energy consumption standpoint. To semiautogenous mills which have become widespread , 5 to 10 percent grinding bodies usually metal spheres are added. Important factors in this process are the properties of the suspension e. The coal is mined from a coal mine by either strip or underground methods, as appropriate to the respective deposit. Keller Corp Original Assignee Keller Corp Priority date The priority date is an assumption and is not a legal conclusion. The dryed coal product from the updraft dryer is kept at its elevated temperature; for example, in the range of 225° F. If desired, as indicated by the dashed line 41, a specific fraction of firm, undisturbed coal particles that are of high quality may be sent directly to storage at this stage.
In this study, the correlations between the deformation of gangue filling material and the characteristics of energy dissipation were examined under lateral uniaxial compression. Pine oil or eucalyptus oil has tendency to wet metal sulphides. These and other objects will become apparent from the descriptive matter hereinafter, particularly when taken in conjunction with the appended drawings. The new underflow would contain carbon particles from 50 to 100 microns and most of the gangue materials. The statistical technique of factor analysis that relates the variables and factors allowed to the optimization of the reagent dosage.
This study investigates the effect of gangue particle size on the recovery of ultrafine and fine 10—50 µm particles. If desired, solvent extraction may be employed to pull one or more of the constituents from the alcohol liquor into another stream before being separated by distillation, adsorption, or any of the other separation means conventionally employed. The carbonaceous material tends to break down to smaller sizes than the more durable gangue materials. Results indicate that ultrafine magnetite can be recovered similar to fine magnetite when the gangue particles are fine as well. In addition, they can act as a source of multivalent ions, which are known to reduce the concentration of collector molecules, active for flotation.
In order to separate the valuable components of an ore from the waste rock, the minerals must be liberated from their interlocked state physically by comminution. Analysis After one or more samples are taken from an amount of ore passing through a material stream such as a conveyor belt, the samples are reduced to quantities suitable for further analysis. Support from the backfill body can inhibit the movement of overlying rock strata and significantly alleviate the influence of mining. In this stage, the ore is crushed in cone crushers to less than 10 to 15 millimetres. The method of claim 1 wherein the additionally comminuted coal in the alcohol slurry in accordance with step g.