A method of processing materials containing noble metals, by chromatographic separation and fractionation

 

The invention relates to hydrometallurgy. A method of processing materials containing noble metals, in particular steel primary concentrates, is that these materials at elevated temperatures consistently subjected to oxidation treatment, restorative treatment and chlorination by introducing gaseous manufacturing environment. Gold and platinum group metals remain in the residue, which was subjected to oxidative acid leaching. From the resulting liquid phase is separated chromatographic first gold faction, and the remaining liquid fractionary chromatography to separate the platinum group metals; and the fractionation is carried out at a relative movement between the layer of particles in the form of a cylinder and at least one inlet fluid. The method allows to increase the output of precious metals and their separation. 5 C.p. f-crystals, 2 tab.

Description the Invention relates to a method of processing materials containing noble metals, in particular steel primary concentrates, in which these materials at elevated temperatures consistently subjected to oxidative obrabotaet and platinum group metals remain in the residue.

This method was named industry chlorochromate way and described in the patent WO 96/17097. Moreover, it allows to remove from raw materials containing gold and platinum group metals, other metals and other impurities in the gas phase, so that in the end there remains a residue enriched in gold and platinum group metals. Raw materials are any of the concentrates from the metallurgical processing of Ni, cu or Zn, contains as concomitant metals or impurities, for example, S, Se, Ad, Te, si, Ni, As, Sb and Pb. First, the material is treated with an oxidizing gas (oxygen or oxygen-containing gas mixture, such as, for example, 20% O2in inert gas or air) at a temperature of from 200 to 800oC, preferably from 400 to 500oWith; first of all removed completely S and Se, but oxides of metals and removes volatile oxygenated compounds.

After washing with an inert gas, for example, N2and/or CO2handle regenerating gas (hydrogen or hydrogen-containing gas, for example nitrogen with at least 1% N2) at from 200 to 1000oC, preferably from 600 to 800oWith, first of all to restore a previously formed metal oxides to metals. Then again the industry is>C, and volatile chlorides (for example, chlorides cu, Ni, Ag) vanish. After cooling, the material is washed to remove non-volatile chlorides, and get the remainder, which contains a concentrate of gold and platinum group metals also containing, for example, SiO2.

The technical result of the present invention is to increase the output of products and separating ability.

The technical result is achieved by a method for processing materials containing noble metals, in particular steel primary concentrates, in which these materials at elevated temperatures consistently subjected to oxidation treatment, restorative treatment and chlorination by introducing gaseous manufacturing environment, with gold and platinum group metals remain in the residue, according to the invention the residue is subjected to oxidative acid leaching, after acid oxidation leaching of the liquid phase is separated chromatographic first gold faction and the remaining liquid fractionary chromatography to separate the platinum group metals, and fractionation is carried out at a relative movement between the layer of particles in the form of a cylinder istitle hydrochloric acid, containing chlorine gas, or, for example, hydrochloric acid and N2About2or the usual Imperial vodka, and gold and platinum group metals into solution.

From this solution first in a known manner to separate the gold faction. As slotselected ion exchange resins known vinylstyrene resin, in particular amberlite XAD7.

In conclusion, after separation of the gold remaining liquid chromatographic fractionary on the individual platinum group metals, and fractionation is carried out at relative motion between particles in the form of a cylinder and at least one loading place of the liquid.

The method of carrying out chromatography, in which relative movement occurs between the layer of particles in the form of a vertically positioned cylinder and at least one located above the loading area of the liquid treating material, which the individual components are in a spiral of material particles and at the same time go along the bottom of the cylinder volume in different areas of the perimeter, is a continuous process and is called Annularly chromatography. Continuous Annularly chromatography has an international reduction of CAC.

This investo circle about the place(places) download and capture. As an example of the literary source, which is described in detail, the device of the second type, as well as an overview of the different chromatographic methods can be called the patent EP-A Union Oil of California.

Unexpectedly found that this method, combined with chlorochromate way not only gives excellent yields of products, but also has good separating ability.

Particularly suitable for the fractionation of platinum group metals are organic ion exchangers in the form of macroporous spherical gels, such as on the basis of 1) polysaccharides dextranomer type 2) crosslinked polymethacrylates and 3) cross-linked polyacrylamide.

Example products 1) is ion exchanger Sefradex G company Pharmacia (Sweden), a dextran, crosslinked with epichlorohydrin. Example product 2) is ion exchanger Toyopearl HW company Tosohaas (Japan, USA), which is polymethylacrylate, crosslinked with ethylene glycol. Example of products 3) is ion exchanger Biogel P company Biorad (USA), which is a copolymer of acrylamide with N,N'-methylene-bis-acrylamide.

In the first stage of the proposed method gas-phase processing of the source material leads to the loss of mass from 30 to 3O 2% and losses of palladium from about 0.5 to 1%.

Subsequent chromatographic selection of gold and chromatographic fractionation of platinum group metals is practically loss - noble metal content in the exhaust stream from the column is less than 50 o'clock N. m, and the exhaust flow naturally, can be recollision.

For CAC-fractionation of platinum group metals it is preferable that were feeding the oxidation potential of at least 700 mV, in particular from 800 to 1200 mV, to ensure the transformation of Iriiiin the Iriv. This oxidation can be carried out as usual, chemical, or electrochemical in mind CAC-columns (anodic oxidation).

An example of the Original product: Concentrate of precious metals "Impala Fe-Grain" 1) Chlorochromate stage: Finely ground concentrate granularit from 1.56 wt.% corn starch. The granules are subjected to heat treatment in the washing gas (see table.1).

When this was observed when heated to 450oWith a white pair and at 450oWith the elimination of water; when handling oxygen white pair; in the processing of H2/N2at 850oWith the first white, then red, then dark brown pair, as well as the removal of water; also when processing ClTada: the Balance within 3 hours boiled in conc. HCl by passing Cl2.

After 3 hours was measured potential solution, which amounted 1053 mV. The solution by filtration was separated from the insoluble parts, washed with water 1: 1 and separated the gold fraction by passing the solution through a column with amberlite XAD7. The remaining solution was again oxidized by boiling for 2 hours and ozonation CL2and as the load was applied at a rate of 1 ml/min, column CAC, which was filled with Toyopearl HW 40 F, and washed with 1 mol/l Hcl solution (15 ml/min).

Type: Layer is rotated against the load and the receiver layer Thickness: 0,65 cm Height layer: 38,0 cm Diameter layer: 24,4 cm2Rotation: 95o/h From the bottom of the column selected two fractions of the eluate first angle of approximately 70oand the second at an angle of about 140oin relation to the place of loading, which had by loading the composition given in table.2.

Discovered that rhodium passes in the first fraction, and palladium in the second fraction; thus, this processing method allows the separation of these two metals from each other. Pt remains in the column.

Claims

1. A method of processing materials containing precious metals, cast is subsequently subjected to oxidation treatment, restorative treatment and chlorination by introducing gaseous manufacturing environment, with gold and platinum group metals remain in the residue, wherein the residue is subjected to oxidative acid leaching, after oxidative acid leaching of the liquid phase is separated chromatographic first gold faction and the remaining liquid fractionary chromatography to separate the platinum group metals, and fractionation is carried out at a relative movement between the layer of particles in the form of a cylinder and at least one loading place of the liquid.

2. The method according to p. 1, characterized in that the separation of the gold produced at vinylstyrene resin.

3. The method according to p. 1 or 2, characterized in that the fractionation is performed on the gel polysaccharide dextranomer type, gel stitched polymethacrylate or gel of cross-linked polyacrylamide.

4. The method according to one of paragraphs.1-3, characterized in that the oxidative acid leaching is carried out with hydrochloric acid containing chlorine gas.

5. The method according to one of paragraphs.1-4, characterized in that the remaining liquid before fractionation to oxidize the redox potential, equal, cryogenically way.

 

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