Einige Kolloidmahlversuche mit einer Kugelm�hle

Andreasen, Arne; Berg, Søren; Kjaer, Erik

doi:10.1007/bf01509413

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Critical Study Of the Wagner Methods1

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1939

1974

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Cited by 9 publications

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“…cm. per gram (7) In the present discussion the spherical shape constant has been employed in order not to complicate the equations unduly. Absolute shape constants are to be preferred, but the same correc-…”

Section: Critical Study Of the Wagner Methodsmentioning

confidence: 99%

Particle Size Studies. Methods

Schweyer¹

1942

Ind. Eng. Chem. Anal. Ed.

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Section: Critical Study Of the Wagner Methodsmentioning

confidence: 99%

Particle Size Studies. Methods

Schweyer¹

1942

Ind. Eng. Chem. Anal. Ed.

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Superfine grinding of coke and other materials

Mott¹

1950

J. Chem. Technol. Biotechnol.

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The methods for superfine grinding are reviewed in the light of recent experience at the Midland Coke Research Station during the grinding of coke and other materials. The wet and dry processes arc compared, and it is shown that with dry grinding the end of effective grinding is caused by caking of the material in the mill. Wet grinding, by avoiding ultimate caking, enables grinding to continue to n further stage. The effect of size and type of ball is discussed, and the benefits obtained by adding different alkalis and other materials during wet grinding are described and compared.

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Adsorption of iodine vapour by powders

Hamaker¹

1939

Recl. Trav. Chim. Pays‐Bas

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According to a method developed by d e B o e r powder samples baked out in vacuo are exposed to iodine vapour which is adsorbed at the powder surface. The amount adsorbed is determined by a simple chemical titration.T h e precautions necessary arid the reproducibility of the observations are discussed in detail. Surface reactions and the effect OF milling in a ball mill can clearly be traced by corresponding changes in the adsorption. 5 1. Zntroducfion. By d e B o e r and collaborators 1 ) the adsorption of iodine vapour in an evacuated system has been used to study the structure: and properties of sublimated layers of CaF,, BaCI., etc. T h e experiments described below were made to investigate whether the same technique could be used to determine the relative surface of powdered substances, this being a measure of particle size.T h e greater part of our observations were made on barium strontium carbonate, a mixed crystal 1 : 1 of BaCO,, and SrCO,, which is used for making oxide coated cathodes. Suspensions of these mixed crystals &re frequently ground in a ball mill before use and we intended to study the variations in particle size due to the milling. Hence this particular choice of material. In the course of the investigation, however. other substances have occasionally been used in order to compare their behaviour with that of BaSr( CO,),.

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Einige Kolloidmahlversuche mit einer Kugelm�hle

Cited by 9 publications

References 0 publications

Particle Size Studies. Methods

Particle Size Studies. Methods

Superfine grinding of coke and other materials

Adsorption of iodine vapour by powders

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