Classifying – separating – and assorting solids – Plural – diverse separating operations – Including sorting of special items or sorting by methods or...
Patent
1980-10-27
1984-04-10
Reese, Randolph
Classifying, separating, and assorting solids
Plural, diverse separating operations
Including sorting of special items or sorting by methods or...
299 10, 299 18, 436 26, 436177, B07C 500, E21C 4106
Patent
active
044416164
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THIS INVENTION
1. Field of this Invention
This invention relates to a process for sorting coarse to fine materials according to their chemical composition, in which samples are taken and analyzed, and in which the transporting and/or further processing of the materials is controlled according to the results of the analysis.
2. Prior Art
When mining mineral raw materials, it is necessary for an economical process that the composition of the raw material be constantly controlled. On the one hand this determines the proportion of waste rock or pay gravel, and on the other it is often necessary to keep certain disturbing admixtures under control. For these measurements, a sample must be obtained for analysis which is as representative as possible of the batch of raw material under consideration. Normally, random samples of the raw material are taken using a shovel or some other grabbing tool. The sample is then prepared for the actual chemical analysis (ground homogenized). This presents two important problems, namely:
obtaining a really representative sample; and
conducting the analysis in such a short time that, depending on the result of the analysis, it is possible to intervene in the transporting or further processing of the materials.
Since the total analysis (taking the sample, preparation and chemical analysis) takes a relatively long time (at least ten minutes), it has so far only been possible to take samples and intervene in the process according to the results of the analysis at intervals which are too great. The result of this in mining iron ore in a large underground mine, for example, is the undesired mixing of ores having different phosphorus contents. This mixing of ores causes the yield of low-phosphorous ore to fall far below what is possible from a geological point of view. The mixing occurs directly at the mining site. The blasted ore is transported to shafts approximately 40 to 200 m away using power shovels (one shovel holds about 8 tons). A sample weighing around 1 kilogram is taken only from about every tenth shovel using a grabbing tool. This sample is ground, sifted and magnetically separated, with one part of it then being dried; and a part thereof is measured and analyzed by wet chemical methods. On the basis of the results of this analysis, all further shovels are tipped into the shaft provided for the grade analyzed until the results of the next analysis are available, although the composition of the material generally changes from one shovel to the next. The phosphorus content, which is an important determinant of quality, may vary by a factor between 10 and 100.
BROAD DESCRIPTION OF THIS INVENTION
The object of this invention is to develop a process by which representative samples of the material, which is to be analyzed and passed on in sorted form, can be taken and analyzed within a sufficiently short time. By this process, a sample is taken from each shovel when mining ore as described above, and is analyzed so quickly that the contents of the shovel can be transported without delay to the shaft provided for this ore composition or for this quality. This permits a much more precise sorting of the material mined. (Fine dust: particles having grain sizes of less than 200 .mu.m, and in particular cases, e.g., iron ore, less than 100 .mu.m.)
It has now been shown that this object can be achieved in a technically advanced manner, in the known process as described above, if the samples are taken in the form of a raised mixture of coarse and fine dust, which is obtained as a by-product or is produced artificially, if the coarse dust is then separated, and if the remaining fine dust or a fraction of this fine dust is analyzed. The process of this invention can be used in the mining or processing of minerals, such as, ore, coal, basalt, sand, etc., or semi-finished products, such as, minerals in the form of pellets, coke, and many other materials.
The dust sample can be precipitated on a filter or collected in a small jar. The amount of dust yielded will generally b
REFERENCES:
patent: 3743356 (1973-07-01), Sheets
patent: 3843198 (1974-10-01), Reynolds
patent: 3868222 (1975-02-01), Barringer
patent: 4152923 (1979-05-01), Courbon
patent: 4249655 (1981-02-01), Patureau et al.
Freund Hans-Ulrich
Heide Helga
Konig Rainer
Sieglen Rolf A.
Cockburn Joscelyn G.
Hancock Earl C.
International Business Machines - Corporation
Reese Randolph
Wacyra Edward M.
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