Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting
Patent
1980-10-27
1985-12-17
Novosad, Stephen J.
Boring or penetrating the earth
With above-ground means for handling drilling fluid or cutting
175213, 299 14, 7386441, E21C 3900, E21C 3726, E21C 3720
Patent
active
045587523
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THIS INVENTION
1. Field of this Invention
This invention relates to devices for obtaining dust from minerals.
2. Prior Art
At present, prospectors collect above-ground mineral samples on the basis of geological, mineralogical and other indicators. Chunks of mineral for this purpose are separated from the solid rock or from larger chunks using simple tools. The lumps of ore are morphologically analyzed and subjected to chemical elemental analysis. Bore hole ground samples or bore hole cores are drawn in the prospecting of underground deposits. Likewise the ground material, which is obtained during drilling and transported from the bore hole by means of flushing means, may also be used for the purpose of analysis. In both cases, fairly large quantities of up to a few kilograms of starting material are needed, the starting material is then possibly ground, dried and homogenised. A small representative fraction of this is used for the analysis.
In the mining of mineral raw materials, samples are taken from the mineral transport flow at various points, beginning at the working point. Taking a reliable, representative sample is important for quality control. This means that a large initial quantity of material of a few hundred kilogram is required for each analysis, which is taken from the conveyor belt, truck load or stockpile. This initial quantity may possibly be processed further in several stages always in separated fractions, for example, dried, crushed, etc. At the end of this process there is also a small quantity of a few grams of substance which is used in the analysis a relatively small amount in comparison to the initial quantity.
The elemental analysis is conducted, for example, by the wet-chemical method or by using X-ray fluorescence. In the first process the sample-substance is dissolved in strong acids and then subjected to quantitative testing methods which are adapted to the elemental components of the valuable mineral in question. These processes include simple robust methods for use in field work and complex methods using automated apparatus for use in the laboratory. In the case of X-ray fluorescence, the sample material is pressed into pellets and fed into an automated analytical instrument. The sample may be analysed for elements with atomic numbers greater than ten, with a certain detection limit specific for the element.
DESCRIPTION OF THIS INVENTION
The present invention is based on the task of developing a device with which representative sample material may be obtained within a very short period of time. In particular, the sample should be of small grain size and be suitable for direct analysis.
It has been found that this problem can be solved in a technically progressive manner if the device consists of an excitation part for mechanical ultrasonic vibrations coupled with a chisel, and if a suction device is provided to collect the dust produced.
The device serves in particular to produce dust samples rapidly for quick analysis of minerals in prospecting, in the reconnaissance and evaluation of deposits and in the mining of minerals for the purposes of quality control, monitoring and controlling the mining process.
Advantageously, in the device, the chisel is pivoted, and the chisel tip is calotte-shaped, conical or bevelled. Advantageously, the suction nozzle concentrically surrounds the chisel tip. Advantageously, the chisel tip contains a bore hole which represents the suction nozzle of the suction device. Further advantageously, a filter is provided in the air flow of the suction device to collect the dust produced. Advantageously, an impactor is used in the suction device to collect the dust produced.
The ultrasonic excitation part supplies the energy for exciting the chisel to high-frequency mechanical vibrations. Piezoelectric or magnetostrictive transducers may be used for this purpose. The chisel is coupled with the excitation part and vibrates with maximum amplitude at the tip. The chisel tip is shaped so as to favor the production of dust and so as to ma
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Freund Hans-Ulrich
Heide Wolfgang M.
Sieglen Rolf A.
Goodwin M.
Luossavaara Kiirunavaara AB
Novosad Stephen J.
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