Method for extracting nickel from nickel-containing production solutions of sulphuric underground or heap leaching

FIELD: metallurgy.

SUBSTANCE: method for extracting nickel from nickel-containing production solutions of sulphuric underground or heap leaching involves nickel sorption on cation-exchange resin of chelate type with functional group bis(2-piridyl methyl)amino. After sorption the nickel desorption and strippant treatment is performed. Prior to strippant treatment, ferric iron is removed from it by sorption on anion-exchange resin in in the shape of at pH=1.6-2.4.

EFFECT: reducing the number of ferric iron prior to treatment of nickel-containing solutions in order to improve nickel extraction.

1 dwg, 3 tbl

 

The invention relates to metallurgy, and in particular to methods of obtaining Nickel.

Nickel productive solutions of sulfuric acid underground and heap leaching of oxidized Nickel ores contain magnesium, ferric iron, Nickel, cobalt, and sometimes small amounts of manganese, zinc, copper and chromium.

The concentration of these elements in Nickel productive solutions of sulfuric acid underground and heap leaching vary depending on the time of the leaching process, within the following limits:

1) magnesium 0.3 to 14.0 g/l;

2) trivalent iron of 0.3-5.0 g/l;

3) Nickel 0.5-1.0 g/l;

4) cobalt of 0.025-0.15 g/l;

5) manganese 0.2 to 1.0 g/l;

6) chromium of 0.1-1.0 g/l;

7) zinc 0.02 g/l;

8) copper 0.02 g/l

As a prototype of the selected method of extraction of Nickel from Nickel-containing productive solutions of sulfuric underground and heap leaching (patent RU №2352654), including the sorption of Nickel cation-exchange resin chelating type with a functional group of bis(2-paradigmatic)amino followed by desorption of Nickel and processing of decorate.

The disadvantage of this method is that together with the Nickel in desorbed gets trivalent iron, and it is not possible to get conditioned Nickel salts or cathodes of the required quality at electroextraction.

Chemical status is in decorate after sorption of Nickel chelate sorbent type with a functional group of bis(2-paradigmatic)amino vary within the following limits:

1) Nickel 80-90 g/l;

2) iron trivalent 0.01 to 5.0 g/L.

The technical task of the invention is the reduction of ferric to processing of Nickel-containing solutions.

This task is solved in that in the method of extraction of Nickel from Nickel-containing productive solutions underground or sulfuric acid heap leaching, including the sorption of Nickel cation-exchange resin chelating type functional group of bis(2-paradigmatic)amino followed by desorption of Nickel and processing of decorate that before processing decorate from him remove trivalent iron by sorption on anionite the resin in the SO42-in the form at a pH of 1.6 to 2.4.

As anionite resin SO42-you can use the AV h, Dowex SBR-P, Dowex WBA and WBA2.

At a pH of less than 1.6 trivalent iron sulfate sorbed to a lesser extent than at a pH of 1.6 to 2.4. The drawing shows the dependence of the capacitance anionite resin AB-h in SO42-the shape of the volume of the missed solution.

At a pH of more than 2.4 trivalent iron sulfate hydrolyzes and precipitates in the pore space of the anion exchange resin in hydroxide Fe(OH)3and clogs the space of the voids of the anion, not allowing the sorption process.

The method was carried out as follows.

For the exception of the studies of the sorption of iron (III) was prepared model solution chemical composition, close to the solution, which is expected to be obtained after desorption on the cation-exchange resin, chelate type with a functional group of bis(2-paradigmatic)amino.

Sorption is carried out on anionite the resin in the SO42-form type AB-h as follows.

The model solution is fed into the column from the bottom upwards with a speed of 3 ml/min using a Masterflex peristaltic pump.

Column is a glass tube with a height of 1.17 m and an inner diameter of 15 mm working volume of the sorbent is 206 ml.

The results of sorption in dynamic conditions, the sorbent AB-h at a pH of 1.3, pH 1.6, the pH of 1.8 are presented respectively in table 1, 2, 3.

1,3
Table
The results of the sorption of iron in dynamic conditions on the sorbent AB-h at a pH of 1.3
№ p/pThe composition of the initial solution, g/lThe volume of solution, mlThe number of (Vp/Vc)The composition of the solution after sorption, g/lExchange capacity (g/l sorbent)
pHNiFe(III) pHNiFe(III)Fe(III)
11,3914860,422,50,410,0111,66
21,3914320,573,0652,70,0222,28
31,3914350,743.04 from82,70,0452,95
41,3914400,93of 3.0794,70,163,69
5914491,173,23to 97.10,5to 4.52
61,391455the 1.443,26100,70,185,54
71,3914501,683,25100,70,256,44
81,3914521,933,21103,10,417,35
91,3914922,38 to 2.67103,11,468,48
101,3914972,852,46103,13,58,71
111,3914973,312,37103,14,8to 8.34
121,3914993,792,3103,14,87,95
131,39141004,282,13103,166,99

Table 2
The results of the sorption of iron in dynamic conditions on the sorbent AB-h at pH 1,6
№ p/pThe composition of the initial solution, g/lThe volume of solution, mlThe number of (Vp/Vc)The composition of the solution after sorption, g/lExchange capacity (g/l sorbent)
pHNiFe(III)pHNiFe(III)Fe(III)
11,6914790,382,162,280,161,47
21,6914410,58to 2.6763,80,16 2,23
31,6914310,73to 2.6780,10,162,81
41,6914330,892,6989,30,163,42
51,6914421,092,7993,90,1674,20
61,6914431,302,99to 97.10,26to 4.98
71,6914 721,65399,70,426,22
81,6914932,102,99to 97.10,57,80
91,6914862,522,799,219,05
101,6914972,992,5299,22,239,88
111,6914903,422,4497,93,28 10,19
121,6914943,882,3897,93,2910,51
131,6914884,302,3294,34,0510,49
141,6914994,782,1794,34,110,45
151,69141015,272903,9910,45
161,6914 1015,761,8100,84,610,16

91 91
Table 3
The results of the sorption of iron in dynamic conditions on the sorbent AB-h at pH 1.8
№ p/pThe composition of the initial solution, g/lThe volume of solution, mlThe number of (Vp/Vc)The composition of the solution after sorption, g/lExchange capacity (g/l sorbent)
pHNiFe(III)pHNiFe(III)Fe(III)
11,8914790,382,660,10,0161,52
21,84400,583,3449,70,022to 2.29
31,8914410,773,2979,30,045is 3.08
41,8914420,983,3780,50,0453,88
51,8914401,173,4794,80,0454,65
61,8914411,373,480,15,42
71,8914431,583,4899,60,1676,22
81,8914481,813,52103,40,45? 7.04 baby mortality
91,8914412,013,55102,20,567,73
101,8914962,473,22103,40,679,27
111,84852,882,71041,610,26
121,8914993,362,53105,82,211,12
131,89141003,852,4799,92,811,70
141,89141004,332,4999,33,411,99
151,89141004,812,28 102,23,612,19
161,8914975,282,2100,53,412,47
171,89141005,772102,24,312,32
181,89141156,321,8799,34,212,21

The method of extraction of Nickel from Nickel-containing productive solutions underground or sulfuric acid heap leaching, including the sorption of Nickel on the cation-exchange resin, chelate type with a functional group of bis(2-paradigmatic)amino followed by desorption of Nickel and processing of decorate, wherein before processing on the sorbate from him remove trivalent iron by sorption on anionite resin in in the form at a pH of 1.6 to 2.4.



 

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