THE APPLICATION OF MÖSSBAUER CASSITERITE ANALYSER FOR THE APPROXIMATE ANALYSIS OF TIN CONTAINING ORES OF MIXED COMPOSITION

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THE APPLICATION OF MÖSSBAUER CASSITERITE ANALYSER FOR THE

APPROXIMATE ANALYSIS OF TIN CONTAINING ORES OF MIXED COMPOSITION

I. Garsanov, V. Labushkin, E. Makarov

To cite this version:

I. Garsanov, V. Labushkin, E. Makarov. THE APPLICATION OF MÖSSBAUER CASSI- TERITE ANALYSER FOR THE APPROXIMATE ANALYSIS OF TIN CONTAINING ORES OF MIXED COMPOSITION. Journal de Physique Colloques, 1980, 41 (C1), pp.C1-477-C1-478.

�10.1051/jphyscol:19801188�. �jpa-00219677�

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JOURNAL DE PHYSIQUE Colloque Cl , suppl6ment au n ^O1, Tome 41, janvier 1980, page Cl-477

THE APPLICATION OF MSSBAUER CASSITERITE ANALYSER FOR THE APPROXIMTE ANALYSIS OF T I N CONTAINING ORES OF MIXED CWPOSITION

I.Ya. Garsanov, v.G. Labushkin, E.F. Makarov

AZZ-Union Research Institute of Physico-TechnicaZ and RadiotechnicaZ Measurements, Moscow, USSR.

One of the practical applications of the ~$ssbauer effect involves the approximate analysis of tin-containing ores

&-a

The t&6ssbauer cassiterite analyser was reported[2]to be developed in which a re- sonanse ionization chamber was used as a detector. The application of the resonance method of registering the .scattered radiation from the sample permitted the instrument characteristics to be substan- tially improved

[3] .

^Anew modification of the instrument with the logic elements in its circuitry has an upgraded reliabi- lity and stability.

In the analysis o f tin-containing ores the content of oxidized tin can be rciscal culated due to the so-called matrix effect arising from the different influence of the filler composition on the radiation intensity analysed. It was reported [I] that the results of measurement of the cassiterite concentration are independent of the filler composition when measured by means of a non-resonant detector.

It is seen from our investigations (Fig. I) that the instruments employing the resonance methods of radiation detec- tion show the strong dependence of the quantity measured

&h%

(where I,

I00

Pig. I. The dependence E=F(C) for the samples with Si02

sand

^Fe⁰^matrices.

2 3

and loo are the ioniziation current va- lues at the source velocity V=O and V= 00

on the concentration of impurity elements in the sample. It should be pointed out that in order to determine the cassiterite concentration by the instruments of this ty-pe, they must be preliminarily ca- librated against the standarts which are usually the powder samples of Imown cassiterite contenk and whose filler composition may differ from that .of real samples.

To eliminate the influence of impurity elements on the accuracy of cassiterite content measurements the selective filters were deposited in a d e f a t e sequence on the input window of the detector unit.

These filters absorb the fluorescent ra-

Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphyscol:19801188

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c1-478 JOURNAL DE PHYSIQUE

diation from t h e impurity elements lying within t h e energy range from 4.5 t o I1 k6V

Ihe efficiency of a f i l t e r system con- s i s t i n g of t h i n / IO mg/cm2 / layers Ca&!i!i02+Cr 2 3 0 i s demonstrated by the example of an iron-containing matrix since iron i s the major impurity element in t i n ores.(Pig. 2)

Pig. 2 The amplitude spectra of t h e radiation from the source scattered by the Fe 0 m a t r i x (with 1% Sn02)

2 3

The multi-layer f i l t e r (CaQcTiO2+Cr2O3) made it possible t o get rid of the back- ground component of the ionisation current ewoed by t h e interaction of the fluorescent X-ray radiation with the resonance radiator substance depo- s i t e d on the electrode p l a t e s of a resonance ionization &ember and having t h e excitation potential of Lsn t i n l i n e between 3.9 and 4.4 keV.

Curve 3 of Fig. I was obtained f o r a powder sample with Fe ⁰matrix using the

2 3

f i l t e r s described above. It coincided with t h e calibration curve I obtained f o r t h e

standard c a s s i t e r i t e samples in t h e Si02

samples can be cancelled, u t i l i z i n g t h e resonance method of registering t h e

Gesbauer radiation of the sample and e l i - minatibg the fluorescent X-ray l i n e s of impurity elements from the spectrum of scattered radiation.

Iief erences

[I]

^Gammaresonauce methods and instruments used i n t h e analysis of physes of the mineral raw materials.

Atomizdaht

,

^1974.

[2] Garzanov, I .Pa. ,Karlashchub,V. I., KO- telnikov,V.A., Labushkin,V.G., Maka- rov,E.P., Proceedings of the !jth In- ternational conference on S s s b a u e r spectroscopy, Bratislava. Part 3.

1973, 660.

[j] The K W R instrument. The advertisement leaf l e t . ~ t a n d a r t g h i z

.

^1978,

matrix.

Thus, t h e influence of t h e matrix being the mador source of systematic e r z o ~ 6 i n c a s s i t e r i t e content measarrements of r e a l