SU1327959A1 - Method of extracting copper from solutions - Google Patents

Abstract

The invention relates to the field of chemical technology, in particular to methods for extracting copper from solutions, and allows a 3 to 3.5 times increase in the degree of copper recovery in a multi-cycle process. The method for extracting copper includes the absorption of copper ions by a sorbent based on mixed hydroxide and magnesium phosphate GFM-1, desorption of absorbed copper from the sorbent with its simultaneous regeneration with a solution containing, mol / l: 1.8-3.0, 0.5- 1.0 NHiCl and 0.12-0.55 MgSO. 1 hp f-ly, 4 tab. (L ATS 1C SO ate with

Description

The invention relates to chemical technology, in particular to methods for extracting non-ferrous metal ions using inorganic sorbents, and can be used in chemical, metallurgical, and other folk farms to extract copper from solutions.

The aim of the invention is to increase the degree of copper recovery in a multi-cycle process.

Example 1. In the sorption column with the parameters of 0.78 cm X20 cm load 2.5 cm granulated by drying the sorbent based on magnesium phosphate - GFM-1 composition Mg (PO4) g - 3Mg (OH) j-nH20 (2 g in the calculation of air dry mass). Through the layer of material in the column, 1230 ml of a solution of the composition, g-eq / l: MgSO 0.1 CuSO 0.01, are passed at a rate of 7il until complete overshoot of the copper ions. The copper sorption capacity is 80 mg / g. Extraction rate 40%. After washing the product with 50 ml of water, 40 ml of a desorbing solution of the composition, mol / l: 1, MgSO 0.55, NIi, OH 3.0 are passed through the column at a rate of 3.5 ± 0.5 h. The degree of desorption is 95 ° / o. The eluate obtained is treated with 5.0 ml of a 1N solution of NajS to precipitate copper as copper sulfide CuS. The result is 0.23 g CuS, i.e. all the copper from the eluate passed into sediment. The recovery of copper from the solution is 40%.

After washing with water (50 ml), the sorbent is ready for the next sorption cycle of copper ions. Then the sorption - regeneration cycles are repeated in the same mode.

The sorbent showed stable operation in the mode of repeated copper sorption cycles — desorption of copper. The results of the sorbent in cycles are given in table. one.

Table 1

In just 4 cycles, 248 mg of copper per 1 g of sorbent was extracted. Loss of sorbent per cycle averages 3%.

Example 2. In Example 1, copper is sorbed. Desorption is carried out with a solution of the following composition, mol / l: 2.3, NI-p 0.75, MgSO4. 0.3.

The results of this experiment are shown in Table. 2

table 2

15

98

A1

87

45

85

46

90

53

In just 4 cycles, 250 mg of copper and 1 g of sorbent were recovered. Sorbent loss per cycle 2.5%. Example 3. Copper sorption is carried out as in example 1. Desorption is carried out with a solution, mol / l: NH, OH 1.8, NH4C1 0.5, MgSO

0.12. The results of the work in cycles are given in table. 3

Table 3

A total of 4 cycles extracted 258 mg of copper 50 1 g of sorbent. Sorbent loss per cycle 2.6%. Example 4. Copper sorption is carried out as in example 1. Then copper is desorbed, changing the composition of the desorbing solution.

Data on the influence of the composition of the solution on the technological parameters of the process are given in Table. four.

Table 4

Claims (3)

Claim 45 1. A method of extracting copper from solutions, including contacting them with a sorbent based on mixed hydroxide and magnesium phosphate and its regeneration with a solution of ammonium hydroxide, characterized in that, in order to increase the degree 50 of its extraction in a multi-cyclic process, regeneration is carried out in the presence of ammonium chloride and magnesium sulfate. 2. The method according to π. 1, characterized in 55 that ammonium hydroxide, ammonium chloride and magnesium sulfate are taken in quantities of 1.8— 3.0, 0.5-1.0 and 0.12-0.55 mol / L, respectively.