US1235598A - Method for treating roasted ores with liquids. - Google Patents

Description

- I v v Amman. METHOD FOR TREATING ROASTED ORES WITH LIQUIDS.

APPLICATION FILED MAR 4, I915- Patented Aug. 7, 1917.

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' Application filed March 4, 1915. I Serial N 0. 12,010.

To all whom it may concemg:

Be it known that I, ARTHUR RAMiiN, a subject of the King of Sweden, residing at Villa Skansen, Olympia, Halsingborg,

Sweden, have invented new and useful Improvernentsin Methods for Treating; Roasted Ores with Liquids, of which the following is a specification. I

The present invention relates to a method of treating roasted ores for the purpose of facilitating their subsequent lixiviation If for instance a chloridizing roasted ore is lixiviated. in the hitherto used manner in vats or basins, it will harden or form larger or smaller agglomerates or lumps, whereby the lixiviation is highly retarded I and large quantities of lixiviating liquid'are needed. The formation of such lumps or agglomerates is due to the fact, that all the.

particles ofthe ore have not been treated with equal quantities of liquid, some particles absorbing the liquid more rapidly, than the other ones. These particles also become lixiviated easier than the other ones at a subsequent li-Xiviation, because the liquid can pass better throughthem than throu'ghthe other-jones, so that it will be formed in the whole bulk' of the ore channels or passages, through which the lixiviat in liquid preferably passes, while other portions of the ore become actedupon by the said liquid in a relatively little degree.

For that reason the lixiviating liquid must,

be used ina very great excess, and the time of lixiviation must be very long if a complete lixiviation of the roasted ore shall take place.

If ores, having been subjected to a chloridizing roasting, are treated inthe mannerhereinafter [described and forming the obtlty of liquid (which quantity shall only be such that the ore becomes intimately-mixed therewith Without any great excess of the liquid in the mixture) and if the'said treat ment is carried out before the ore is brought to the vats or basins, in which the usual lixiviation takes place, the idvantag'e is gained, that the ore during this lixiviation does not form' agglomerates or lumps, (counteracting a complete and rapid lixivi ation), because all the particles of ore al ready from the beginning of the treatment are treated with even that quantity of liquid, which they are able to absorb, whereby the said particles have changed their Specification 01 Letters Batent.

pact of the invention, with a suitable qllfll'lr.

Patented Augn' l, 1%17.

physical qualities and lost their disposition of absorbing diii'erent quantities of liquid and of forming hard'lnmpsor agglomerates.

For this reason, any f( rmation of lumps and agglonierates is avoided, and the whole mass will be completely porous and penetrable for liquid which is not otherwise the case. At a following lixiviation invats or basins of ore thus treated the process can be effected in a fraction of the time which is otherwise necessary, because no hard a; glonierates have been formede which require longer time for lixiviation; the solutions obtained also will be concentrated. 1

The liquid used for treating the ore cools it, if the ore is hot, for wln'hh reason the ore at the lixivia'tion in the vats or basins is cool and cannot cause any formation of dust and steam, which formation now takes place at the treatment with the liquid now mentioned, whereby the collection of dust,

not permeable to liquid, is sprinkled or.v

sprayed as it isfed forward, by a quantity of liquid distributed overthe width thereof, while at the same time the dust and vapors which may be formed when the hot ore is sprinkled with the liquid can be carried away by suction ton condenser in which the gases are condensed by means of liquid while the ore particles are suspended in the condensed product from which they are afterward filtered off. i

In the accompanying drawing, a device suitable for carrying out this .method is shown in a side view in Figure 1 and in a plan view in Fig. 2.

,The apparatus illustrated in Figs. 1 and 2 consists of a feeding" hopper a for the roasted material, the lower mouth of said of the hopper, as regards the direction of rotation of the table, is a pipe with several small openings, through which water or other liquid may be sprinkled over the hot materiah'fed forward in an even layer over the table, said material'being then evenly treated with the liquid so as to'be cooled and transformed in a more easily extractable ranged around the apparatus (shown in dash and dotted lines) and serving to prevent the formed vapors and dust from spreading; said casing should be provided with a pipe 6 leading to a condenser f on the v tion of theore may first be extracted in one bottom of which the ore particles are collected. The hot water (or liquid) obtained by condensation of liquid in the condenser is conducted ofi alone at g and used for in- I stance for lixiviating ore in extracting whereby the heat taken from the ore is utilized. The non-condensed gases are conducted oil at it. The ore on the table is carried, during the rotation of said table, to

. ward a scraper i which removes it from the,

table through an opening in the casing.

If the ore is not subjected to. the liquid in a hot condition no vapors are termed and the casing can be omitted.

The sprinkling with liquids of substances placed upon a movable filter bed for lixiviation, extraction or washing of them is known. According to the present invention a movable bed 15; used not for lixiviation, but for the mixing of the roasted ore with a liquid, so that all the particles of the orebecome uniformly treated and are uniformly altered as to their physical or chem ical qualities, whereby better results are obtained at the subsequent lixiviation.

By exactly suiting the quantity or the na-, ture of the liquid used in such treatment of roasted ore some of the salts present in the roasted ore can be transformed into a more readily soluble state than other ones. By Successive lixiviation of the ore thus treated there may thus first be obtained a solution which chiefly contains the more solublesaltsand then a solution containing the less soluble ones It is possible in the manner now described to treat efficiently ores containing substances which have been transformed, by chloridiziug or other roasting, into a form soluble in certain solvents or originally are present in the ore in this form. Thus for'instance ore containing silver which has been transformed into silver chlorid by chloridizing roasting can be treated with a solution of common salt or hyposulfite, or, if containing gold, with chlorinous water, it being then possible to treat all theparticles with equal quantities of solvent which thus need not be added in excess. In a similar way other solvents may be employed or such liquids which are obtained at the extraction of ores treated according to the present method.

In the manner now described it is easier than before to utllize for instance zlnc from the solutions or lyes obtained in extracting roasted copper ore containing zinc. As the copper, for economical reasons, is generally precipitated from. the lyes by means of iron which then is partially dissolved, the final capable of being used.

roasting in theabove described manner the zinc during the following complete lixivialye and the copper in a following one. In the first lye then a quantity of copper will be present, but so small that only a very small quantity of iron will be required for precipitating it. For this reason. very small quantities of iron are dissolved in the zinc solution compared with the quantities obtained in the usual processes, and these quantities therefore can easily be removed, compared with the large quantities of iron present in the solutions after precipitating the copper by iron from solutions containing zinc according to the usual process.

It is obvious that similar advantages are obtained in utilizing "zinc solutions even if another nrccipitating agent for copperthan iron is used.

For controlling the quantities of liquid and ore the speed of the carrier may be made a dj ustable.

Having now particularly described the nature of my invention and the manner of its operation, what I claim is:

1. The method of treating roasted ores which consists in continuously feeding the ore in a thin layer upon a movable impermeable bed, sprinkling the layer uniformly with a quantity of liquid, removing the ore and absorbed liquid from the bed, and liXiV- iating the same.

2; The method of treating roasted ores which consists in continuously feeding the orc in a thin layer upon a movable impermeable bed, sprinkling the layer uniformly with a quantity of liquid, removing by sucing the sprinkling, removing the ore and absorbed liquid from the bed, and lixiviating the same.

The method of treating roasted ores which consists in continuously feeding the ore in a thin layer upon a movable impermeable bed, sprinkling the ore uniformly with a quantity of 'a liquid adapted to render some constituents of the ore more soluble than others, removing the ore and absorbed liquid from the bed, and lixiviating the same.

at. The method of treating roasted ores which consists in continuously feeding the ore in a thin layer upon a movable impermeable bed, sprinkling the ore uniformly with a quantity of a. liquid adapted to render some constituents of the ore more soluble than others, removing by suction. the gases, vapors and dust formed during "the sprinkling, removing the ore and absorbed-liquid from the bed, and lixiviating the same.

memes! 5. The method of treating roasted. ores which consists in feeding the ore in a thin layer upon a movable impermeable bed, sprinkling the ore uniformly with a quantity of liquid, removing by suction the gases, vapors and dust formed during the sprinkling, removing the ore and absorbed liquid from the beci, and subjecting it to repeated lixiviations for obtaining difi'erent lyes.

6. The method of treating roast/ed ores which consists in feeding the ore in a thin layer upon a movable impermeable bed, sprinkling it uniformly with a quantity of a liquid adapted to render some constituents of the ore more soluble than others, remov ing by suction the gases vapors anddnst formed during the sprinkiing, removing the ore and absorbed liquid from the bed, and

v ARTHUR RANK,

VVitnesses ADA SIMON, H. HAMMAL.

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