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This decomposition, or as it shall be hereinafter called, "attack", is carried out with the following advantages: (1) intimate mixing throughout the reaction or attack period; (2) actual grinding with exposure of fresh reaction surfaces; (3) introduction of external heat into the reaction space, thus permitting the use of low acid concentrations;<a href="http://www.lightcrusher.com/solutions/grinding-media-balls.html">grinding media balls</a>; (4) delivery of product as a fine powder which is the best possible form for further processing; (5) uti. ation of the simplest possible type of equipment, giving minimum maintenance costs and simplicity of operation; (6) provision of large quantities of material at reaction temperatures with the accompanying stabilizing effect on minor variations in composition of feed; (7) the automatic nature of the process in that the materials to be decomposed are continuously fed to the reaction vessel and that the product is continuously delivered for further processing.
In the drawingFigure 1 shows a cross section of the ball mill that has been used for the attack of ilmenite with the hereinbefore mentioned process. In this figure (I) represents the cylindrical shell of a ball mill having end plates (2) and (3), with trunnions (4) and (5) supported in bearings (6) and (1). The mill is driven at approximately 60% of critical speed by a suitable pinion meshing with ring gear (8).<a href="http://www.lightcrusher.com/solutions/granite-machinery.html">Granite crushing machine for sale</a>. The cylindrical shell (1) of the mill is provided at one end with a number of slots (9) registering with discharge hopper (II) and vent stack (10). The shell (I) and the end plates (2) and (3) of the mill are covered with suitable heat insulation (12). The trunnion (5) is hollow and tapers internally towards the inside of the mill. It provides for the admission of protecting sleeve (14), through which are introduced ore pulp admission pipe (15) and acid admission pipe (16). The ore pulp is supplied through pipe (17) and may be regulated by means of valve (19), while the acid is introduced through pipe (18) and controlled by valve (20). The interior of the ball mill is filled with pebbles, or preferably steel balls (13), to the level of the opening througlh the trunnion (5). Slots (9) are too small to permit passage of these balls.
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