摘要:
The invention disclosed herein is a novel media milling process performed in an atmosphere of propellants(s) utilizing a resonant acoustic mixing (RAM) device. The process is utilized to reduce the particle size of API (optionally including excipients) to a respirable size range while ensuring the retention of the crystallinity of the milled API.
摘要:
An apparatus and continuous process for making milled solid in liquid dispersions comprises several steps: 1) Forming a pre-mill mixture of pre-mix, milling media, and previously milled dispersion. 2) Milling the pre-mill mixture to form a milled mixture of milling media and milled dispersion. 3) Separating a portion of the milled dispersion, which is substantially free of milling media, from the milled mixture. 4) Recycling the un-separated mixture by adding additional pre-mix to form the pre-mill mixture to create a continuous milling process. The pre-mix comprises a liquid and a solid. The process is a continuous process and the milling media is recycled through the milling step. Much of the milled dispersion is also cycled through the milling step several times and only a portion of the milled dispersion, which is substantially free of milling media, is removed as the milled dispersion product.
摘要:
The invention relates to a grinding body for crushing and grinding of ores rocks or earth, inert and all other materials, in drum and other mills. It finds application in ore enrichment, production of construction materials, waste processing and other industrial branches. The grinding body comprises a spheroidal cone (1), whose forming curve (5) is part of a circle or of some other geometrical curve and a vertex (6), and a base (2) which is part of a sphere or of other three-dimensional figure, obtained by rotation of geometrical curves and an edge (4) between them. In one of the versions the cone (1) and the base (2) are connected by a cylinder (9). For better producibility of the grinding body, a flat spot (3) with circular or other shape is made on the surface of the base (2). In another version the flat spots (7, 8) are made on the surface of the cone (1) and on the surface of the cylinder (9) between the base (2) and the cone (1). In a subsequent version the vertex (6a) of the cone (1) is cut flat with its plane perpendicular or inclined towards the axis of the body. In other versions, more or less convex peripheral rings (10, 11, 12) are made between the cone (1) and the base (2). The cross section of these rings has the shape resembling a circle, a triangle or a rectangle. In a subsequent version on the base (2) and on the flat cut vertex (6a) short cylinders (13) with flat bases (14) are protruding. All edges and the vertex of the body may be rounded along part of a circle, spiral or other geometrical figure. The grinding body has greater area than the spherical grinding body and greater density in a given space. The existence of an edge and a vertex increases milling productivity.
摘要:
The present invention relates to grinding media for fragmentation and grinding of ores, rock and earth mass and other materials mostly in drum mills, and it finds application in ore mining, construction and other industrial branches. The grinding media have the form of spheroidal tetrahedron, obtained from the crossing of four spheres with equal radii, the centers of each one lie on the top of the surface of the others and are tips of regular tetrahedron. The radii of the spheres are equal to the regular tetrahedron's edge. At least one of the tips (1) of the spheroidal tetrahedron is flatly beveled and the rest are rounded, so one and the same mass of material is taken away from each tip (1). It is possible the edges (2) of the grinding media to be rounded, beveled or ribbed. The ribbing can be even or arch-shaped.
摘要:
The invention relates to a fine-particle, bright and high-coating rutile-based pigment which is characterised in that it is devoid of any metal or reactive metal compounds relevant to mill abrasion detectable by application technology but whose grain-size in terms of particle diameters ranges from 50 to 1000 nm, for mono-, bi-, tri- or oligo-modal size distribution and a primary maximum ranges from 230 to 400 nm, wherein optionally for a bi- or poly-modal frequency distribution, a secondary maximum is less than 25 % of the primary maximum between 400 and 1000 nm. The method for producing said pigment consists in treating an organic mixed-phase rutile structured oxide pigment by high-speed grinding in suspension in a ball grinding mill provided with a mechanically and chemically resistant coating until said grain-size and a substentially isometric rounded particle shape are attained. According to the invention, means for viscosity adjustment and surface conditioning of the pigment are also provided. The inventive pigment differs from prior art by improved brightness, low whiteness or low lightness, relatively high hue saturation and by extremely high covering power which is not obtainable in said class of products up to now and exhibits a low photoactivity with respect to known fine-particle rutiles. In practice no abrasivity, neither interaction of possible grinding residues with an application matrix is observed.
摘要:
The invention relates to sintered ceramic grinding balls comprising the following compounds (by wt.-%): 18 to 50 wt.- % mullite (3Al2O3.2SiO2); 9 to 25 wt.- % zirconium (ZrO2 + HfO2) stabilised by 0.5 to 3 wt.- % rare earth oxide; and 25 to 72 wt.- % alumina (Al2O3).