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US 4,225,091 AGranted
Method of and apparatus for the milling of solids
AssigneeBabcock Krauss-Maffei Industrieanlagen GmbH
InventorKlaus Steier
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AssigneeBabcock Krauss-Maffei Industrieanlagen GmbH
InventorKlaus Steier
Estimating the term…
A method of operating a milling installation to regulate the fineness of the milled product, in which the milled product emerges from the output side of a mill, e.g. a ball-type tube mill, and material to be milled is introduced at the opposite side of the mill. According to the invention, the mass output rate dm/dt or m of the product is continuously or discontinuously measured and this measurement is used to control the rate of mass output at the output side of the mill so that the output rate is held substantially constant. The invention is applicable to a through-flow (continuous open-circuit) mill in which a fresh starting material is continuously introduced into the mill and to the circulating system (continuous closed-circuit mill) in which the output of the mill is delivered to a classifier which separates the fine product from a coarse component which is recycled to the mill.
A method of regulating the fineness of a first product produced by a through-flow milling installation of the continuous open-circuit type wherein said milling installation includes a continuous mill having an inlet for material to be milled and an outlet for discharging said product, said method comprising the steps of measuring the mass flow rate of the milled product from said outlet and controlling said mass flow rate of said mill selectively by feedback and outlet control so that the outputted mass flow rate is substantially constant with time.
In a method regulating the fineness of a first product produced by a circulating milling installation with a ball mill having an inlet and an outlet, a classifier downstream of said mill for separating the material discharged at said outlet into a first product stream and a coarse stream, and a conveyor between said mill and said classifier, the improvement which comprises maintaining the ratio between the mass flow rate of said coarse stream and the mass flow rate of said product stream substantially constant and measuring said ratio and selectively controlling the discharge from said outlet of the mill and return of said coarse stream to said inlet of the mill to maintain the mass flow rate of the material emerging from said outlet substantially constant.
A continuously operating tubular or ball mill having an inlet for fresh material to be milled and an outlet for said material, the improvement which comprises means for maintaining the mass flow rate at the outlet substantially constant, said means including an adjustable chute at said outlet for recycling a variable portion of the milled product supplied to the outlet back to said mill proximal said outlet, and a mass-flow detector controlling the position of said chute.
Dependencies are inferred from the claim text.