Method of separating mineral particles with pretreatment with magnetic colloid

FIELD: chemistry.

SUBSTANCE: method involves mixing aqueous pulp of starting material with a dispersion containing colloidal magnetic particles and treating the obtained mixture in a magnetic field to extract a concentrate of the valuable component. The dispersion of magnetic particles is pre-stabilised by treatment in an aqueous medium with reagents of general formula A1-R-A2, where R is a hydrocarbon radical selected from C3-C18, A1 is COOH or CONOH, A2 is OH or CH(OH), or treatment in a liquid hydrocarbon medium with reagents of general formula A1-R, where R is a hydrocarbon radical selected from C3-C18, A1 is COOH or CONOH. After stabilisation, the dispersion is treated with a functionalising agent and mixed with the pulp of the starting material. Extraction of the concentrate of the valuable component and magnetic particles is carried out by deposition in a gravitational field in form of magnetic floccules with field strength of 80-880 KA/m or on magnetic separators in form of magnetic floccules with field strength of 32-800 KA/m.

EFFECT: high efficiency of extracting fine mineral particles using a technique for magnetisation with a magnetic colloid, followed by separation of the valuable component using magnetic techniques.

8 cl, 4 tbl, 5 ex

 

The invention relates to the field of mineral processing and may be most efficiently used in the processing of crushed ore containing small amounts of valuable mineral, presents fine particles, in particular ores of gold.

There is a method of using the magnetic particles together with inorganic coagulants and organic flocculants for water treatment to remove dissolved and suspended impurities. The use of magnetic particles with the subsequent imposition of a magnetic field can significantly accelerate the settling of floc due to their consolidation and magnetization (O.M. Urbain, and W.R. Stemen, U.S.Patent No.2,232,294, Feb.18, 1941).

The known method (S. de Latour, J.A.W.W.A., 68, 325, 443, 498, 1976), consisting in the use of high-gradient magnetic separation for separation of magnetite, Laden with impurities, for water purification from suspended particles, bacteria, dissolved phosphates.

The disadvantage of the above methods is that the magnetite used in the process as the carrier, not firmly fixed contamination that result from mixing with the pulp tend to separate.

The greatest efficiency of the magnetic carriers is provided by chemical functionalization of their surface, which increases its sorption activity and affinity to the desired typesignature. The greatest amount of flexibility, such functionalization, are provided in the colloidal size particles. In this case, the magnetic colloidal particles can play the role of the media, if they sorption of ions or small molecules, or to perform a function manicavasagar agent, which is assigned PA surface of relatively large particles, giving them magnetic properties. When using colloidal particles as carriers, increased efficiency is also due to the large specific surface of the magnetic colloid.

Closest to the proposed method, a set of essential features, is the method of separation of minerals using magnetic methods, including the dispersion of the feedstock in an aqueous medium, mixing the pulp with an aqueous dispersion containing magnetic particles of colloidal size, processing the mixture in a magnetic field to extract concentrate valuable minerals (U.S. Patents 4, 225, 425 and 426, September 30, 1980).

The disadvantages closest analogue should include the following: aqueous dispersion containing magnetic particles tends firmly enough to gain a foothold in the mineral surface and, in consequence, when mixing the magnetic particles can be separated from the surface of the mineral.

The main objective of the invention is in the icenii the efficient recovery of fine mineral particles, through the use of technology magnetised magnetic colloid, followed by separation of the valuable component of the magnetic methods.

This is achieved by the fact that in the method of the separation of mineral particles containing valuable component comprising a dispersion of raw materials in the aquatic environment, mixing the resulting slurry with a dispersion containing colloidal magnetic particles, processing the mixture in a magnetic field to extract concentrate valuable component, previously exercised by the stabilization of the dispersion of magnetic particles processing in the aquatic environment reagents generalized formula A1 R-A2, where R is a hydrocarbon radical selected from a range With3-C18group A1-COOH or CONOH, A2-HE or CH(OH) or the processing in the environment of liquid hydrocarbon reactants generalized formula A1-R, where R is a hydrocarbon radical selected from a range With3-C18A1-COOH or CONOH, after the stabilization of the dispersion process functionalities reagent and mix with the pulp feedstock containing valuable component, and removing from the mixture of mineral particles concentrate valuable component and the magnetic particles is carried out by sedimentation in a gravitational field, as the magnetic floc in field strength in the range 80-880 kA/m or magnetic separators, magnetic floc in field strength in the gap is e 32-800 kA/m

For the processing of the dispersion of magnetic particles in the aquatic environment use functionalitiy reagent generalized formula A3-R-A4, where R is a hydrocarbon radical selected from a range With3-C18, A3-COOH or CONOH, a A4-SH or OCS(SH)

For the processing of the dispersion of magnetic particles in the liquid hydrocarbon used functionalitiy reagent generalized formula A4-R, where R is a hydrocarbon radical selected from a range With3-C18the group A4-SH or OCS(SH).

Processing the obtained mixture is performed in a porous matrix in a magnetic field, with the deposition of the magnetic flocs in the media, and non-magnetic particles are removed by the flow of water.

To intensify the process of flocculation of the mixture was added a suspension of magnetite in an amount of 0.1-10% by weight of raw materials.

The magnetic field strength is chosen in the range from 720-880 kA/m

As carriers use an iron fraction 3-6 mm

As carriers use steel wool.

The essence of the proposed method lies in the fact that the mineral particles (particle size 0.n-n*10 µm) ie (0.1 to 90 μm) are mixed with magnetic colloids. In the mixing colloids stick PA surface of the mineral, which can be selected using magnetic methods of enrichment. The process of converting surface properties of mineral particles in magnetic properties,is carried out using, as the carrier, magnetic colloid, which is capable of selectively fixed on the particles of valuable minerals. This improves the extraction of metal in concentrate and reduce extraction in the tails.

To obtain a dispersion containing magnetite colloids, use functionalities and stabilizing reagents. Their choice depends on the type of ore, i.e. selected reagents group which is active with respect to the valuable mineral.

The opportunity for practical application of the new method of allocating mineral particles on the real ore tested in the wretched on the gold content of the ore (gold field weathering crusts).

Ore low sulphide, gold content, according to the assay analysis, 2.8 g/so Predominant particle size of gold particles is less than 0,044 mm the Most common ore minerals in the sample are pyrite and arsenopyrite.

The method is as follows.

The source of gold-bearing ore is crushed to the content of 70-85% of class 0.1-0.15 mm with respect to T:W=2:1. The resulting slurry is mixed with magnetic colloids. The resulting product is separated using magnetic methods of enrichment. The efficiency of the enrichment was assessed by indicators of removing metal in concentrate (E %) and metal content in the tails (βXB, %). Influence of the form of magnetite colloids on technological pok the indicators presented in table 1.

Example 1

The source of gold-bearing ore is crushed to the content of 70-85% of class 0.1-0.15 mm with respect to T:W=2:1. The resulting slurry is mixed with magnetite colloids previously prepared in the form of stabilized and functionalized water magnetic colloid. The magnetic colloidal particles (size, e.g., 5-50 nm) stabilized the protein solution containing the fragments of the composition A1 R-A2 R - C9group A1 - COOH, group A2 - HE, in aqueous solution. Stable colloid is processed xanthate (C4H9OS2K) containing fragments of composition A3-R-A4, where R4group A3 - COOH, and the group A4 - SH containing functional groups which are active with respect to the valuable mineral. The results of the study are presented in table 2.

Example 2

The method is carried out as in example 1, the difference is that in this experience magnetite colloids are served in the form of emulsified in water magnetic colloidal solution in apolar liquids. Stable colloidal solution of magnetite in kerosene emulsify in water with the addition of xanthate (C4H9OS2K) containing fragments of the composition of the A4 - R, where R is a C4and the group A4 - SH, and a stabilizing reagent, which is convenient to use aliphatic alcohols (C4H9OH) containing fragments from the tava A2-R, where R is C4, group A2-IT is all mixed, the emulsion is formed by the usual shaking of the mixture. The allocation of the valuable component is the magnetic concentration methods. The results of the study are presented in table 3.

Example 3

The source of gold-bearing ore containing 70-85% of the class of 0.01 mm is mixed with magnetite colloids previously prepared in the form of stabilized and functionalized water magnetic colloid or in the form of emulsified in water magnetic colloidal solution in apolar liquids. Selection of valuable components is carried out at high gradient separators. As a carrier of magnetic particles used steel wool. The results of the study are presented in table 2, 3.

Example 4

The method is carried out as in example 1, the difference is that the allocation of the valuable component is a magnetic flocculation, and to intensify the process is added to a suspension of Fe3O4in an amount of 0.1-10% by weight of raw materials. The separation of the magnetic floc is carried out by sedimentation in a gravitational field when the field strength in the range 80-880 kA/m or separators in the form of a magnetic floc in field strength in the range 32-800 kA/m, table 2, 3.

The results of the study are presented in table 5.

Example 5

The method for implementation through the Xia as in example 2, the difference is that in this experience as recoverable valuable component is Cu. The primary ore is crushed to the content of 70-85% of class 0.1-0.15 mm with respect to T:W=2:1. The resulting slurry is mixed with magnetite colloids previously prepared in the form of emulsified in water magnetic colloidal solution in apolar liquids. Stable colloidal solution of magnetite in kerosene emulsify in water with the addition of xanthate (C4H9OS2K) containing fragments of the composition of the A4 - R, where R4and the group A4 - SH, and a stabilizing reagent, which is convenient to use oleic acid (C17H33COOH) containing fragments of the composition (A2) R, where R17group A2-COOH, everything is mixed, the emulsion is formed by the usual shaking of the mixture. The allocation of the valuable component is the magnetic concentration methods. The results of the study are presented in table 4.

The proposed method will reduce the loss of gold in the processing of ores and involve in the production of finely disseminated ore, ore weathering crusts, refractory gold ores, industrial education.

Instead of the reagents may be used any of their analogues, the use of which at the present state of the art technology allows you to reduce sebestoimost the ü enrichment.

Table 1
Influence of the form of magnetite colloids on technological parameters
OptionsValue
E %βXB, %
Form colloids Fe3O4In the form of stabilized and functionalized water magnetic colloid;83,810,75
In the form of emulsified in water magnetic colloidal solution in apolar liquids.80,100,98

βHN, %
Table 2
Influence of methods of extraction of valuable components when applying particles in the form of stabilized and functionalized water magnetic colloid on technological parameters
OptionsValue
E %
Sedimentation in the gravitational field69,960,93
Magnetic separator with tension 320 kA/m74,040,85
On high gradient separators84,490,73
On high gradient separators:
The magnetic field strength kA/m
72078,540,86
80081,630,80
88083,730,76
- Media
Fraction 3 mm85,840,69
Fraction 6 mm84,390,73
Steel wool brand 00 86,900,61
Steel wool marks 086,270,63

Table 3
Influence of methods of extraction of valuable components when applying particles in the form of emulsified in water magnetic colloidal solution in apolar liquids on technological parameters
OptionsValue
E %βXB, %
Sedimentation in the gravitational field69,200,95
Magnetic separator with a tension of 120 kA/m72,850,88
On high gradient separators100,000,00
On high gradient separators:
The magnetic field strength kA/m
44075,650,95
64080,580,84
88083,730,76
- Media
Fraction 3 mm85,050,71
Fraction 6 mm83,730,76
Steel wool brand 0086,530,64
Steel wool marks 085,390,68

Table 4
Influence of methods of extraction of valuable components when applying particles in the form emulsionable in water magnetic colloidal solution in apolar liquids on technological parameters
OptionsValue
E% βXB, %
Sedimentation in the gravitational fieldof 47.553,1
Magnetic separator with a tension of 120 Ka/m60,942,5
On high gradient separators in a porous matrix71,591,8
On high gradient separators in a porous matrix:
The magnetic field strength kA/m
44065,212,2
64068,612
88070,101,9
- Media
Fraction 3 mm67,982
Fraction 6 mm63,32,3
71,691,7
Steel wool marks 074,501,65

Table 5
Effect of suspension of magnetite on technological parameters
OptionsValueE %β, %
Suspension of magnetite, % by weight of raw materials0,177,860,69
386,020,45
1091,560,28

1. The method of the separation of mineral particles containing valuable component comprising a dispersion of raw materials in the aquatic environment, mixing the resulting slurry with a dispersion containing colloidal magnetic particles, processing the mixture in a magnetic field to extract concentrate valuable component, wherein the pre-exercise stabilize the dispersion magni is different particle processing in the aquatic environment reagents with a generalized formula A1 R-A2, where R is a hydrocarbon radical selected from the range3-C18group A1 - COOH or CONOH, A2 - HE or CH(OH), or processing in the liquid hydrocarbon reactants generalized formula A1-R, where R is a hydrocarbon radical selected from the range3-C18group A1 - COOH or CONOH, after the stabilization of the dispersion process functionalities reagent and mix with the pulp feedstock containing valuable component, and removing from the mixture of mineral particles concentrate valuable component and the magnetic particles is carried out by sedimentation in the gravitational field of a magnetic flocs when the field strength in the range 80-880 kA/m or magnetic separators in the form of magnetic flocs when the field strength in the range 32-800 KA/m

2. The method according to claim 1, characterized in that the processing dispersion of magnetic particles in the aquatic environment use functionalitiy reagent generalized formula A3-R-A4, where R is a hydrocarbon radical selected from the range3-C18group A3 is selected from among the groups COOH or CONOH, a group A4 of the number of SH groups or OCS(SH).

3. The method according to claim 1, characterized in that the processing dispersion of magnetic particles in the liquid hydrocarbon used functionalitiy reagent generalized formula A4-R, where R is a hydrocarbon radical selected from the range3-C18and the group A4 is selected from : the group SH or OCS(SH).

4. The method according to claim 1, wherein processing the obtained mixture is performed in a porous matrix in a magnetic field with the deposition of the magnetic flocs in the media, and non-magnetic particles are removed by the flow of water.

5. The method according to claim 1 or 4, characterized in that for the intensification of the process of flocculation of the mixture was added a suspension of magnetite in an amount of 0.1-10% by weight of raw materials.

6. The method according to claim 1 or 4, characterized in that the magnetic field is chosen in the range from 720-880 kA/m

7. The method according to claim 4, characterized in that the carriers use the iron fraction 3-6 mm

8. The method according to claim 4, characterized in that as carriers use steel wool.



 

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EFFECT: increased efficiency of extraction of at least one first substance.

10 cl, 3 ex

FIELD: mining.

SUBSTANCE: to determine the efficiency of at least one step of the recovery method, at least one indicator indicating the amount of the proportion of ore particles or magnetic particles in the separator feed stream and/or separator flux and/or separator of residual stream is determined. An index indicating the amount of the proportion of ore particles and/or magnetic particles is determined for at least two streams, on the basis of this index, in particular, after comparing the parameters relating to each of the flows indicating the proportion of ore particles and/or magnetic particles, at least one operating parameter of the mixing device and/or magnetic separator is set. The index is compared with at least one limit value indicating the minimum or maximum concentration of ore particles in the separator concentrate stream and/or in the residual stream of the separator. Depending on the result of the comparison, at least one operating parameter of the mixing device and/or magnetic separator is set. The method is carried out by means of a device comprising at least one mixing device for mixing mass flow with magnetic particles, at least one supply device for supplying a mass flow to at least one magnetic separator, at least one separation device for separating ore particles from the separator concentrate stream, at least one recording device for determining at least one index indicative of the proportion of ore particles or magnetic particles in the means of at least one control and/or control device, into the separator stream and/or in the separator concentrate stream and/or in the residual separator stream. The control and/or control device comprises at least one computer-readable software. The software, depending on a certain metric, is designed to control and/or adjust the mixing device and/or the magnetic separator and/or the separation device.

EFFECT: increase of extraction efficiency of non-magnetic ores.

16 cl, 1 dwg

FIELD: noble metal hydrometallurgy.

SUBSTANCE: invention relates to method for acid leaching of platinum method from secondary raw materials, in particular from ceramic support coated with platinum metal film. Target metals are leached with mixture of hydrochloric acid and alkali hypochlorite at mass ratio of OCl-/HCL = 0.22-0.25 and redox potential of 1350-1420 mV.

EFFECT: decreased leaching temperature, reduced cost, improved platinum metal yield.

2 ex

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