SU1202621A1 - Method of controlling the process of grinding cement materials - Google Patents

Description

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The invention relates to methods for controlling the grinding process of bulk solids in drum and tube mills equipped with ball loading and can be used in cement, chemical and other industries with joint fine grinding of materials that can be grinded differently.

The purpose of the invention is to increase the quality of regulation.

The essence of the method lies in the fact that during the grinding of cement clinker, the stability of the physicomechanical properties of the cement produced provides an optimal grain composition, which is characterized by a characteristic grain size (q) and an indicator of uniformity (Pc).

In the process of grinding mixed cements, the achievement of optimal values of cJ and lij, which are close in value to d c h c of additive-free cement, makes it possible to obtain mixed cements that are equal in physical and mechanical characteristics of additive-free cement.

As a regulating parameter, additives are used that are equal in terms of the grindability of the cement clinker, and easily grinded additives, the input of which has a significant effect on the physicomechanical properties of the mixed cements. At a certain amount, its input may degrade the properties of the mixed cement due to overgrinding of the constituent components and, as a consequence, the formation of an unfavorable grain composition of the mixed cement, which is reflected in the deviation of the values of the characteristic grain size and its uniformity characteristic of non-additive cement.

Example. In a laboratory mill, the cement clinker is ground without additives and the value of the characteristic grain size W) and its uniformity index (h) for the cement produced are determined.

In an industrial mill, cement clinker is crushed with additives equal in grindability to cement clinker or

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with easily milled additives, the optimum amount of which is reached when the values of the characteristic grain size (d |.)

5 and the uniformity index (hj) are close to the corresponding values of 1, and b c for unfixed cement.

For the additive-free clinker, in a laboratory mill, indicators are obtained that characterize the grain distribution 11c 1.22; c} c 21 microns, while the physicomechanical properties correspond to 54.7 MPa. The achieved performance is taken for

15 optimal. Next, ashes are added in amounts of 7i, 15 and 36%.

The composition of the mixture and properties are given in the table.

Determination of indicators, characterizing the grain distribution,

carried out by known methods using sieve or cross-sectional analyzes followed by processing the results on a computer

25 (it is possible to use a laser granulometer using a microcomputer, where reproduction is carried out in the form of histograms or digital tables). At 7 and 30%

30 ash values reached N. and j (, are close to the clinker, and deviations are for h 1.6%, for J ,. + 20%. The physicomechanical properties are close to or exceed these values for unflattering clinker and are respectively 53 , 8, 56.6 versus 54.7 MPa for additive-free clinker. At 15% ash, the values of K and JV are increased by +3.3 and + 38%, respectively, and the strength properties of the cement obtained are reduced to 48.9 MPa; Thus, in the experiment performed, the optimal

.. the amount of ash is 7 and 30%.

The method can be implemented using a particle size analyzer to quickly determine the grain composition.

A beam of parallel rays emanating from a neon-gel 50 laser, having a low energy, illuminates a cell in which there is a pulverized cell suspended in the corresponding liquid. A beam of rays, traversing from

The 55 cells are focused using a coherent optical system. After this, a multi-cell detection instrument analyzes the distribution

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energy in the plane of focus. The data emanating from the cells is processed using an embedded computer that controls the curvature of the grain composition (-djH-) onto the matrix, printing an average of 16 measurements taken one after the other onto a paper tape.

The advantages of the method for controlling the grinding process are

Editor N. Dankulich

Compiled by N. Alekperov

Tehred: M. Parotsay Proofreader L. Pilipenko

Order 8348/7 Circulation 583 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch GShP Patent, Uzhgorod, st. Project 4

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in.

what it allows using

determination of the characteristic grain size of cement without additives and with additives of different grindability and their uniformity, to obtain mixed cements with an optimal grain composition and with physicomechanical characteristics not lower than for non-added horo cement.

Claims (1)

METHOD FOR REGULATING THE PROCESS OF GRINDING CEMENT MATERIALS in a ball mill, including changing the flow of cement clinker and additives, measuring and changing adjustable parameters, characterized in that, in order to improve the quality of regulation, before changing the flow of cement clinker and additives, the characteristic grain size of cement clinker without additives is determined and an indicator of its uniformity for the resulting cement, and in the process of changing the supply of additives measure the characteristic grain size of the cement mixture with bavkoy and its uniformity index, and the change in additive flow is performed to achieve the equalities <J _C * t + 20%) * Ex ¹ and _q -r (h ₄ - 1.6%), where J _c and - the characteristic of grain size, respectively, mixes of cement with additive and cement without additive; and bc is the uniformity of the mixture of cement with the additive and cement without the additive. SU „1202621