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Patent Issued for Method for Separating Rich Ore Particles from Agglomerates Which Contain Said Rich Ore Particles of Value and Magnetizable...

February 19, 2014



Patent Issued for Method for Separating Rich Ore Particles from Agglomerates Which Contain Said Rich Ore Particles of Value and Magnetizable Particles Attached Thereto, Especially Fe.Sub.3O.Sub.4

By a News Reporter-Staff News Editor at Journal of Engineering -- Siemens Aktiengesellschaft (Munich, DE) has been issued patent number 8640876, according to news reporting originating out of Alexandria, Virginia, by VerticalNews editors.

The patent's inventor is Danov, Vladimir (Erlangen, DE).

This patent was filed on July 22, 2009 and was published online on February 4, 2014.

From the background information supplied by the inventors, news correspondents obtained the following quote: "Suitable magnetizable particles are referred to hereafter by way of example as 'Fe.sub.3O.sub.4', which is intended in a representative sense and also includes other suitable compounds or alloys. Suitable ores of value are referred to hereafter by way of example as Cu.sub.2S, which is intended in a representative sense and also includes other ores of value.

"Ores of value, such as for example copper sulfide (Cu.sub.2S), are obtained by way of ore extraction. In order to separate the copper sulfide from the ore, the ore is first finely ground until it is in a virtually pulverulent form. Subsequently, in order to make magnetic separation of the Cu.sub.2S possible, magnetite (Fe.sub.3O.sub.4) and agents containing other chemical additives which have a hydrophobizing effect on the Cu.sub.2S and the Fe.sub.3O.sub.4 are added to the ore. This hydrophobization occurs as a result of the longer organic molecular chains that are contained in the additives and selectively become attached to the Cu.sub.2S or the Fe.sub.3O.sub.4. The latter are consequently surrounded with a water-repellent shell. These organic molecular chains then bring about an organic bond between the Cu.sub.2S and the magnetite, so as to produce Cu.sub.2S/Fe.sub.3O.sub.4 agglomerates that are magnetic (unlike pure Cu.sub.2S) and, as a result, can be separated from the rest of the fine powder, which substantially contains sand, by means of magnets. This means that these Cu.sub.2S/Fe.sub.3O.sub.4 particles can be extracted as a whole from the remaining material. Since, however, the Cu.sub.2S and Fe.sub.3O.sub.4 particles are of a size that is in the .mu.m range, they have a tendency to agglomerate, that is to say that relatively large, cluster-like agglomerates form from one or more Cu.sub.2S particles and a multitude of Fe.sub.3O.sub.4 particles, the Cu.sub.2S particles being bonded to the Fe.sub.3O.sub.4 particles by way of the organic molecular chains. Within this particle agglomerate, the Cu.sub.2S particles are enclosed virtually completely by Fe.sub.3O.sub.4 particles; the organic molecular chains are situated between the Fe.sub.3O.sub.4 particles and the Cu.sub.2S particles. So, to be able to separate the pure Cu.sub.2S, it is necessary to break up this organic bond and to obtain the individual particles again, so that the Fe.sub.3O.sub.4 can once again be mechanically separated from the Cu.sub.2S. This has previously been performed by chemical means, that is to say it is attempted to break down the molecular chains by a suitable chemical process. As a result of the virtually complete enclosure of the Cu.sub.2S particles with Fe.sub.3O.sub.4 particles, there is the problem that the agents that are intended to react with the organic molecular chains can scarcely come into contact with these organic bonds for which reason the particle separation that can be achieved in this way is only relatively low."

Supplementing the background information on this patent, VerticalNews reporters also obtained the inventor's summary information for this patent: "According to various embodiments, a method can be provided which makes it possible to obtain better separation of the ore particles of value and magnetizable particles that are bonded as a result of hydrophobization.

"According to an embodiment, in a method for separating ore particles of value from agglomerates which contain ore particles of value and magnetizable particles attached thereto, especially Fe.sub.3O.sub.4, in the course of a process for extracting the ore of value from crude ore, within which agglomerates the ore particles of value and the magnetizable particles are bonded by way of organic molecular chains, the agglomerates undergo both an introduction of mechanical energy for breaking up the bonds provided by the molecular chains and an introduction of thermal energy for breaking down the molecular chains.

"According to a further embodiment, the agglomerates can be introduced in the dried state together with grinding elements, especially grinding beads, into a grinding unit, which can be heated. According to a further embodiment, a rotary kiln can be used as the grinding unit. According to a further embodiment, the grinding elements can be separated from the ore particles of value by means of a separating device, especially a screen, arranged downstream of the grinding unit.

"According to another embodiment, an apparatus for carrying out the above mentioned method, comprises a heatable grinding unit, into which the agglomerates, which consist of ore particles of value, especially Cu.sub.2S, and magnetizable particles, especially Fe.sub.3O.sub.4, bonded to said ore particles by way of organic molecular chains, are charged together with grinding elements, in which the agglomerates are broken up by introduction of mechanical energy through the grinding elements and the molecular chains are broken down into the ground material in the grinding unit by introduction of thermal energy, as well as a device arranged downstream of the grinding unit for separating the grinding elements from the separated ore particles of value and magnetizable particles.

"According to a further embodiment of the apparatus, the grinding unit may be a rotary kiln. According to a further embodiment of the apparatus, the separating device can be a screen. According to a further embodiment of the apparatus, arranged downstream of the separating device can be a magnetic separation device, for separating the magnetizable particles from the ore particles of value."

For the URL and additional information on this patent, see: Danov, Vladimir. Method for Separating Rich Ore Particles from Agglomerates Which Contain Said Rich Ore Particles of Value and Magnetizable Particles Attached Thereto, Especially Fe.Sub.3O.Sub.4. U.S. Patent Number 8640876, filed July 22, 2009, and published online on February 4, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=115&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=5721&f=G&l=50&co1=AND&d=PTXT&s1=20140204.PD.&OS=ISD/20140204&RS=ISD/20140204

Keywords for this news article include: Siemens Aktiengesellschaft.

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Source: Journal of Engineering


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