Ball size

Semi-Ball Size Ball Diameter mm. Tube, Bore mm. Semi-Ball Size Ball Diameter mm. Tube, Bore mm. 

That a maximum must exist should be apparent from the obseivation of Coghill and Devaney (U.S. Bur. Mines Tech. Pap., 1937, p. 581) that there is an optimum ball size for each feed size. Figure 20-19... 

Liner wear increases with the size, hardness, and sharpness of feed more than with ball size. The hardness of manganese steel corresponds to softer types of ore, while Nihard is about the same as magnetite [Moore et al.. International J. of Mineral Proce.s.sing, 22, 313-343 (1983)]. Quartz and pyrite are considerablv harder than any metals used. Rubber, being resihent, is less affected by ore hardness, and therefore has the advantage with harder ores. Low-charge volume below 35 percent results in increased wear since the liners are not protected bv a covering of ore. Several studies indicate that wear increases at least proportional to the square of mill speed in percent of critical. 

The key to the successful application of high performance, pourable nitrocellulose plastisols lies in a reasonably priced, high quality source of fine-particle, at least partially colloided, spheroidal nitrocellulose. Here we are speaking of particles much finer than the well-known ball powder, produced by the Olin Mathieson Chemical Co. for small arms for over 30 years (7). Actually, particles on the order of 5-50/x diameter appear to be required to assure a reasonable continuum of uniformly plasticized nitrocellulose binder in a propellant containing 45% or more of combined crystalline oxidizer and powdered metal fuel. Such a continuum of binder is necessary to assure acceptable mechanical properties and reproducible burning characteristics of the finished propellant. Preincorporation of a certain content of the water-insoluble solids within the nitrocellulose microspheres is an effective means of helping to assure this continuum of binder and alleviates the requirements for extremely small ball size. The use of a total of 45% or more of crystalline oxidizer and (generally) metal fuel is essential if the propellant is to be competitive with other modern propellants now in service. 

The relationship critical load (Pc)-ball size is less marked in the region of a large flaw. The same applies to flaw size. In fact, the value Cf has no direct bearing on Pc in equation (6.2.3). 

Semi-ball size Ball diameter (mm) Tube bore (mm)... 

Ball size and weight in die mills in Ceramika Paradyz [11] and Opoczno ... 

Davis assumed that the rate of wear for the different sizes of balls in a mill was proportional to the weight of each ball. The formula developed by Davis has wide application, and has been used by operators to determine the quantity of new balls which must be put in a mill to replace those which are worn. The formula requires that the largest ball size... 

Figure 123. Power Change During Grinding Period for Batch Grinding with Various Ball Sizes. Charge, 50 lb 14/20-mesh Dolomite. Pulp Consistency 60 Percent, Critical Speed 50 Percent.

W hat is the best ball size for grinding clinker initially averaging 0.2 in. in diameter ... 

Note that (1.6) relies on the self-similarity concept since the number of identical objects m and the scale factor r in (1.5) have been replaced by the number of balls m(oj) and the reciprocal of the size 1/w, respectively. The limit (uj > 0) is being used to indicate the estimation of dc at the highest possible resolution, i.e., as the ball size uj decreases continuously. 

Fig. 3.16 The influence of drop ball size in this impact test...

Figure 3.17 The influence of drop ball size for contacting mixture of potassium chlorate and red phosphorus ( O ) and that of potassium chlorate and sulfur ( )...

What is remarkable about the Mondy-Graham results is that for each suspension investigated, the observed viscosity was independent of the relative diameter of the sedimenting ball (df) to that of the suspended spheres (ds) over the entire size range studied (0.75 < df/ds < 12.0). This despite the fact that, because of collisions with the suspended spheres, the instantaneous trajectory of the falling ball was observed to deviate significantly from a simple, uniform-speed, purely vertical trajectory at the smaller ball sizes. In the words of Mondy et al., (1986a),... 

The need for a calculated ball-size feed distribution is open to question however, methods have been proposed for calculating a rationed baU charge [Bond, Trans. Am. Inst. Min. Metall. Pet. Eng., 153, 373 (1943)]. 

Figure 4.2. Changes of the temperature of balls in the planetary mill, depending on activation time, rotation frequency, and ball size [8]. a - rotation frequency, s 1 - 10.2, 2 - 14.3, 3 - 16.6, b - ball diameter, mm 1 - 3, 2 - 5, 3 - 9.

Fig. 25. (a) Sketch of vacancies at different surface oxygen sites 0(1-3) in the M015O56H22 cluster. Cluster atoms of the top (bottom) part of the bi-layer are shown as shaded (white) balls where the ball size decreases from Mo to O to H. The vacancies are sketched as black dots, (b) Relaxed geometry of the M015O56H22-O (=Moi50s6H2i ) clusters with different vacancy sites. 

The passion fruit flavor in prepared foods usually comes from the fruit of Passiflora edulis. Other notable fruits produced by species of Passiflora include the foot-ball-sized granadilla, from P. quadrangularis. Popular ornamental species include P. caerula, with its sky-blue flowers P. alato-caerula, a blue-purple flowered hybrid and P. mollissima, the banana passion flower, so named for the shape of its fruit. 

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