SU1186673A1 - Method of processing sulfide polymetallic iron-containing material - Google Patents

Abstract

1. METHOD OF WORKING lump and metal reagent followed by flotation separation of sulfur and sulphides in the flotation concentrate and iron hydroxides in tails, are different In order to reduce the consumption of the metal reagent and improve the quality of the flotation concentrate, pulp-on precipitation, after separation of 70-95% non-ferrous metals from the thieves of the thieves, supplies acidified pulp containing (L 0.5-2.5 g / l of unbound oxygen in the amount of 5–13% by volume to the initial pulp fed to the precipitation, and the mixture is stirred for 15–60 minutes 2. The method according to p; 1, is different for the purpose of operative control of the process , the amount of oxidized pulp added to the pulp for precipitation is adjusted to 9–9) by a pH value of 3.3–4.1. 00

Description

The invention relates to hydrometallurgy, in particular, to the recovery of heavy non-ferrous metals and sulfur from high-iron ferrous sulphide polymetallic. The purpose of the invention is to reduce the consumption of metal reagent and improve the quality of the flotation concentrate. Example 1 (by a known method). As starting material for precipitating heavy sulphides. non-ferrous metals use sulfur-containing pulp from autoclaving leaching of pyrrhotite concentrate. The pulp contains, in liquid, g / l: nickel 13.2; copper 2.9; iron 16.4 sulfur total 31.5; in solid,%: Nickel 0.67; copper 0.38; iron 44, sulfur total 22.1, E including sulfur elemental 18.2 j pulp pH 1.75; W: T 1.5. The deposition is carried out in a 1.3 liter titanium reactor with mixing with an impelder mixer equipped with an electric heater, a system for measuring temperature and pH of the medium. The amount of the initial pulp loaded in the experiment is 1 l. While mixing, the pool is heated to 90-5 ° C, after which a precipitating reagent is set in the slurry, which is used as an iron powder of the 5K5C grade with a metallic iron content of 98%. From the moment of filing the precipitator begin the countdown of the experience. The duration of the precipitation is 1 hour, the consumption of If69 metallic iron to the stoichiometric amount or 46.63 kg / ton of pyrrhotite concentrate. After the test period, a sample was taken from the reactor for chemical analysis. The remaining pulp is cooled and subjected to laboratory flotation, separating sulfur and sulphides into concentrate, and iron hydroxides into tails. The flotation was carried out in a laboratory flotation machine of the Mechanobr design for 30 minutes with the addition of a foamer (T-80) at the rate of 60 tons / ton of solid pulp and a collector (butyl aeroflot) at the rate of 250 g / ton of solid pulp. According to the test data, after the precipitation, nickel contains 0.21 g / l nickel and 0.0003 g / l copper, which corresponds to the degree of precipitation of 32 non-ferrous metals 99%, pH 4.3. After flotation in a sulfur sulfide concentrate, the ratio of the sum of non-ferrous metals to iron is 0.54. PRI me R 2 (by a known method). The products used and the experimental conditions are the same as in Example 1. The difference is that the precipitation of non-ferrous metal sulphides is carried out in two stages, supplying limestone as a precipitating agent first (as an aqueous slurry), and then after 15 min after the filing of lime metal iron. The amount of limestone by solid is 1 g per g of the total color metals in the pulp solution, and the amount of iron is 1.22 by stoichiometry, or 24.65 kg / ton of pyrrhotite concentrate. According to experience, the total extraction of non-ferrous metals from the pulp solution is 98.9%, the final pH value is 4.2, the ratio of the sum of non-ferrous metals to iron in the flotation concentrate is 0.89. . Example 3 (according to the proposed method). The conditions of the experiment are the same as in example 2. The difference is that the oxidized pulp is fed directly into the pulp to precipitate after 25 minutes from the beginning of the experiment directly from the autoclave, where oxidative pyrolthinate is oxidized at 130 ° C and oxygen overpressure 9 atm., F: T 1.5. The composition of the oxidized pulp after 1.5 hours of leaching is the following in a liquid, g / l: nickel 11.7; copper 2.78; iron 16.6; sulfur is 28.9; pH1.65; in solid,%: Nickel 0.71; copper 0.40; iron 44.4; including pnrroshch 3.9; sulfur is 22.9 total, including elemental sulfur 17.7. The oxidized autoclave pulp is fed through a tubular line, one end of which is immersed in the pulp in the precipitation reactor, and the other is connected to the needle valve on the autoclave. According to chemical analysis, at the time of addition of autoclave pulp in the reactor, the deposition rate of non-ferrous metals is 49.39%, and the pH is 3.5. The amount of autoclave pulp added to the reactor is 0.1 L or 10% of the volume to the original pulp given on

precipitation. After mixing the slurries in the precipitation reactor, the pH is 3.1. The spin-off of the mixture is carried out for 30 minutes, then the precipitation is stopped and the pulp from the reactor is discharged.

In the experiment, the consumption of iron powder was 1.12 to stoichiometry (taking into account water-soluble non-ferrous metals deposited with the addition of oxidized pulp) or 23.20 kg / ton of pyrrhotite concentrate. The final nickel deposition depth achieved is 0.48 g / l. After flotation, the ratio of the sum of non-ferrous metals to iron. in the flotation concentrate is 0.97.

PRI me R 5. As the ishon use pulp, which contains in the liquid ,, g / l: nickel 14.3; copper 3.7; cobalt 0.3; iron 15.2 sulfur is generally 34.7; in solid,%: nickel 0.56; copper 0.35; cobalt 0.01 iron 44.7; sulfur is 21.8, including sulfur is elementary 17.8. In the pulp W: .T 1,5; pH 1.73.

By the time the autoclaved oxidized pulp is deposited in the reactor, the degree of deposition of non-ferrous metals is 70.0%. The composition of the added autoclave pulp in liquid, g / l: nickel 12.2; copper 3.4; iron 15.4; sulfur is total 27.2; in solid,%: Nickel 0.62; copper 0.39; iron 44.1; and including pyrrhotite 3,4; sulfur is 21.3; including sulfur is elemental 17.2. In the pulp pH 1.82, the ratio of W: T 1.5; an unbound oxygen content of 0.84 g / l. The amount of added autoclave pulp is 9.0% by volume of the initial pulp received for precipitation.

After mixing the slurries in the precipitation reactor, the pH of the mixture is 3.5. The final nickel deposition depth achieved in the experiment is 0.17 g / In the flotation concentrate applied after deposition, the ratio of the sum of non-ferrous metals to iron is 1,

Example 5. The conditions of the experiment, including the products used and their costs, are the same as in Example 4i. Addition of autoclaved oxidized pulp to the reactor to precipitate autoclave takes place after 52 minutes from the beginning of the experiment when the degree of non-ferrous metal deposition is 95.0%. After mixing the slurries in the precipitation reactor, the pH is 4.1. . Ultimate nickel deposition depth

the test is 0.23 g / l. After 5. flotation in the resulting concentrate, the ratio of the sum of non-ferrous metals to iron is 1.06.

Example .6. The conditions of the experiment are the same as in Example 4. After a precipitation of 70.0% of non-ferrous metals, the addition of autoclaved oxygen-containing pulp amounts to 5.0% by volume to the initial slurry set into the precipitation reactor at the beginning of the process. Achieving 5 that final nickel deposition depth in the experiment is 0.21 g / l. The ratio of the sum of non-ferrous metals to iron in the distributed flotation concentrate 1.02

20 Example 7. The conditions of the experiment are the same as in examples 4 and 6. The amount of autoclave oxidized pulp that is added to the precipitation, which contains unbound oxygen, is 13.0% by volume of the original pulp fed to the precipitation. After mixing the slurries, the pH value in the reactor. deposition of 3.3. After the experiment, the final deposition depth of nickel is 0.22 g / l. In the concentrate, the ratio of the sum of non-ferrous metals to iron is 0.92. .

Example 8. The content of unclaimed oxygen in the oxidized autoclave pulp added to the precipitation is 0.5 g / l. The deposited depth of the nickel in the experiment is 0.19 g / l. In flotation concentrate.

0 non-ferrous metals to iron 0.96,

Example 9. The content of unrelated oxygen in autoclave pulp added to α-precipitation. 2.5 g / l. After experience achieved

5 The depth of nickel deposition is

0.23 g / l. In a flotation concentrate, the ratio of the sum of non-ferrous metals to iron is 1.19.

Example 10. Experimental conditions, 0 including the consumption of metallic iron for precipitation, are the same as in Examples 4-9. The difference is that a pulp is used as the starting material for the precipitation.

5 contains in the liquid, nickel 15.6 copper 4.1; iron 16,10; sulfur, total 20.5, including sulfur, elementary, at 15.5; W: T 1.3; pH 1.44;

The mixing time of the slurry mixture on the precipitation after the addition of the oxidized space-containing pulp is 15 minutes.

Example 11. Experimental conditions are the same as in Example 10. The difference is that the mixing time of the mixture after adding the oxidized pulp on the precipitation is 60 minutes, Example 12. The difference is that the mixing time of the mixture after

additives for the deposition of oxidized autoclave pulp is 90 minutes. After mixing, the mixture at the specified time in the pulp solution was adjusted to pH 4.0, and the content of nickel and copper, respectively. 0.27 and 0.0005 g / l. These values correspond to a total extraction of non-ferrous metals from a solution of 98.3%. In the resulting flotation concentrate, the ratio of the sum of non-ferrous metals to iron is 0.97, 7 Example 13, The difference is that the mixing time of the mixture after addition to the deposition of the oxidized autoclave pulp is 120 minutes. At the end of the specified mixing time, the residual concentrations in the nickel and copper solution are 0.31 and 0.0012 g / l, which corresponds to the total extraction of non-ferrous metals from the solution to the pulp after deposition of 98.1%. In the resulting flotation concentrate 38, the ratio of the sum of non-ferrous metals to iron is 0.94. The results of the experiments are given in the table. From the above experiments and the table it follows that the proposed method in comparison with the known provides a reduction. the consumption of metal reagent for the deposition and the increase in the quality of the flotation concentrate.

46.63 0.21 4.3

24.65 0.23 4.2

23.20 0.48 3.9

30.0

8.44 2.56

20, t 44.3

0.54

8.95 2.85

13.2 52.1

0.89

9.32 2.91

12.6 54.9

0.97

Claims (2)

1. METHOD FOR PROCESSING SULFIDE POLYMETALLIC IRON-CONTAINING MATERIAL, including oxidative leaching of it in an autoclave in an aqueous pulp when heated under pressure of oxygen with the transfer of non-ferrous metals to a solution; sulfur to elemental and iron to hydroxide deposition of non-ferrous metal sulfides from a solution in a sulfur-containing pulp with a metal reagent or limestone and a metal reagent, followed by flotation separation of sulfur and sulfides into a flotation concentrate and iron hydroxides into tails, characterized in that, in order to reduce the consumption of metal reagent and improving the quality of the flotation concentrate in the pulp, precipitation after separation of 70-95% non-ferrous metals from the solution gives the acidified pulp containing 0.5-2.5 g / l of unbound isloroda in an amount of 5-13 vol.% of the original pulp entering the deposition, and the mixture was stirred for 15-60 min. 2. The method according to p. 1, characterized in that, for the purpose of operational control of the process, the amount of oxidized pulp added to the pulp for precipitation is adjusted according to the pH value of the mixture of 3.3-4.1.