SU1351668A1 - Method of preparing ores of non-ferrous metals for dressing - Google Patents

Abstract

The invention relates to the field of mineral processing and allows increasing the extraction of non-ferrous metals by improving the sieve characteristics and increasing the degree of disclosure of the ore. Ore pulp, which is a multicomponent system consisting of both mineral particles and rock particles, is fed to a device for preparing ores for enrichment and subjected to electrochemical treatment by treatment in the anodic region of the device. The treatment is carried out until reaching the redox potential in the range of 0.22–0.70 V relative to the silver-chloride electrode. Then, the processed ore pulp is fed to the mill, where it is ground by balls, and the ground product is unloaded at the opposite end of the mill and sent to the subsequent technological operation of ore raw material processing - flotation. 2 Il. 1 tab. (L coed 05 ac

Description

This invention relates to field enrichment (other minerals.

 Le. i) of the invention — an increase in the extraction of non-ferrous metals HMiiuj by improving the whitefish characteristics and increasing the degree.

PL of FIG. 1 shows the scheme ocyaiecT- in. 1e; 1i of the proposed method of preparing ores and petroleum metals for enrichment; on (}) 2 according to the content of the class, 21 m. 5, class minus 0.074 mm in the crush-401: according to VI n |) o. 1 and 2 and the extraction of copper in the con ii, eiiT (). T from the quantity of oxidation-reduction; 1 (; the potential of the ore pulp.

 a method for hacking non-ferrous metal ores. (1 h () b), carried out as follows.

and one feed, the ore slurry, across to device 1, where i,., is subjected; .1 () chemical action, after which ii.juiiM v H into mill 2. Milled is discharged from the opposite end; slips 2 and enters the next gohno / jugy processing operation.

The hiiKji Th method consists in the fact that during the pre-averaging anodic treatment, oxidation processes occur more actively, which deepen along the microcracks and lead to the weakening of the mi- peral grains.

The use of preliminary anodic treatment leads to the formation of a sulfur layer in the microcracks and on the surface of sulfide-rich minerals by the following reactions: ZnS - 2e-Zn + 4-S ° E ° (), CEL FeS,) 2гг Fe - ++ 2S ° N ° -. (), 42B Cu: -, FeS.4 - 12e: i ± 5Cu 4-I e + 4S

G: G 0,51V

Cu, S + S 0.56B CuS-Sp- + SE 0.598 PbS-2e i E 0.35B The equilibrium potential (E) of the formation of e; | elemental sulfur on the surface of sulfide minerals is in the range of 0.30-0.59 In a relatively normal hydrogen electrode (N.V.E.). The experimentally determined potentials exceed the thermodynamic values by 100 and 200 mB and are 200-600 mV relative to the silver-chloride electrode (X.S.E.). The formation of a layer of sulfur reduces the strength of the particles being crushed, and likewise their elastic hydration layers, as a result of which the effect of the grinding particles becomes more than l} and |) ecgivpa 1. Short current anomalous current through minerals, affects the speed of movement of dislocations, their concentration in the zones of mineral coalescence, which also leads to weakening of the mineral grains.

The resulting redox potential (OVI) characterizes the properties of the processed product. Optimum mineral properties

five

0

five

0

five

0

five

0

five

Particles are obtained during anodic treatment when the ORP value is within 0.22-0.70 V. At that, ore pulp, processed to an ORP value less than +0.22 V, has poorly expressed oxidizing properties and the use of such a treatment mode for grinding ores is impractical (Fig. 2). It is also inexpedient to process the pulp to an ORP value of more than +0.70 V, since with significantly increasing energy consumption, the achieved grinding parameters remain practically unchanged in the future (see table and Fig. 2)

The method of preparing non-ferrous metal ores for enrichment is carried out as follows.

The feed source, the ore pulp, which is a multi-component system consisting of both mineral particles and rock particles, is put into device 1 for preparing ores for enrichment, where it is subjected to electrochemical exposure using treatment in the anode region of device i. The treatment is carried out to achieve the ORP in the range of 0.22-0.70 V relative to the X.E. Then, the processed ore pulp from the device 1 enters the mill 2, where the grinding of containers takes place. The crushed {th product is discharged at the opposite end of the mill 2 and enters the subsequent processing operation of the ore raw material - flotation.

Example. The copper ore pulp mill of the Dzhezkazgan concentrator with the content of 55-60% solid was subjected to electrochemical treatment in the anode zone of the device for the preparation of ores for enrichment. The anode is made of stainless steel H18N9T. The ORP value of the pulp to be processed was varied by applying a different voltage from an adjustable DC source. ORP was measured with an RP-121 millivoltmeter-RP-meter using a platinum electrode with respect to X.S.E. Then the processed product was filed in a ball mill. The grinding time in all experiments was the same and was 15 minutes. The crushed product was loaded into a 137 FL flotation machine and floated for 17 minutes. A significant improvement in the sieve characteristic (class reduction of +0.210 mm and an increase in class minus 0.074 mm) begins with an ORP of more than +0.22 V. With an ORP value of more than +0.70 V, the sieve characteristic stabilizes. The increase in class minus 0.074 mm in the potential range of 0.22-0.70 V was 3.1%.

The use of the invention makes it possible to increase the recovery of non-ferrous metals from ores to concentrates by improving the sieve characteristic, increasing the degree of opening of the ore and reducing the grade of non-flotation size in the feed.

flotation, which leads to lower losses of metals with tailings.

Claims (1)

Invention Formula The method of preparation of ores of non-ferrous metals to enrichment, including grinding and electrochemical effects on the ore pulp, characterized in that, in order to increase the extraction of non-ferrous metals by improving the sieve characteristics and increasing the degree of ore disclosure, before grinding, the electrochemical effect on the ore pulp is performed by anodic treatment to the redox potential of the ore pulp (+0,22 ) - (+ 0.70) V. U Chz I I I I 79ioo 220 JW 4 fBo 700 it Ofifucjiijme / fbHO - occmaHoBijme / ibHi} /i.i nomef qc o / t about Phi 2 about- (e copper