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A ball mill is a pulverizer that consists of a horizontal rotating cylinder, up to three diameters in length, containing a charge of tumbling or cascading steel balls, pebbles, or rods.
A pulverized coal-fired boiler is an industrial or utility boiler that generates thermal energy by burning pulverized coal (also known as powdered coal or coal dust since it is as fine as face powder in cosmetic makeup) that is blown into the firebox.
Pulverized coal injection was developed in the 19th century, but was not implemented industrially until the 1970s. Rises in the cost of coke due to increased global demand and thus more competition for the resource have made this method attractive to the iron-producing industries and increased its value.
Cultivators stir and pulverize the soil, either before planting (to aerate the soil and prepare a smooth, loose seedbed) or after the crop has begun growing (to kill weeds—controlled disturbance of the topsoil close to the crop plants kills the surrounding weeds by uprooting them, burying their leaves to disrupt their photosynthesis or a ...
Gravitational impact mills pulverize the material inside a rotating chamber. [2] This is accomplished by a cascading motion of larger pieces repetitively impacting and compressively grinding the product into finer particles as it rotates in the chamber. These are generally referred to as "autogenous" impact mills. This action can be enhanced by ...
The mean weight of an adult's remains is 2.4 kg (5.3 lb); the mean weight for adult males is about 1 kg (2.2 lb) higher than that for adult females. [58] There are various types of Cremulators, including rotating devices, grinders, and older models using heavy metal balls. [59] The grinding process typically takes about 20 seconds.
The goal was to develop a simple, holistic system that would pulverize all the elements of the raw material into a fine powder by impacting a high speed flywheel. [5] It was hoped that the resulting flour, made up of smaller particles, would have baking qualities similar to the white, refined flours produced by the roller mills , yet retaining ...
The following is an alphabetical list of Greek and Latin roots, stems, and prefixes commonly used in the English language from P to Z. See also the lists from A to G and from H to O.