SU1294852A1 - Method for removing admixtures from cadmium-, zinc-containing solutions - Google Patents

Abstract

The invention relates to zinc hydrometallurgy and can be used in the purification of cadmium and zinc-containing solutions from impurities of mish and antimony. The purpose of the invention is to reduce cadmium losses and reduce the cost of the process. The initial solutions were heated to 70 ° C, neutralized to a pH of 3.5, 5-10 g / l of sulfide cadmium middling were added as an activating additive, iron (I) was oxidized. And impurities were oxygenated, the pH of the solution was adjusted to 5.0, filtered . The use of cadmium sulfide middling eliminates the introduction of an additional amount of ferrous sulphate. Table I with (L to with i4 do Oi IsD

Description

The invention relates to the field of zinc hydrometallurgy and can be used for cleaning cadmium and zinc-containing solutions from arsenic and antimony impurities.

The purpose of the invention is to reduce the loss of cadmium and reduce the cost of the process.

PRI me R 1. 200 ml of the solution to be purified, containing, g / l: Cd 131.5; Zn 8.3; Fe 2.845 As 0.8; Sb 0.75 (ratio Fe: (As + Sb) 1.83, heated to 70 ° C, the pH of the solution of soda ash was adjusted to pH 3.5, 1 g of cadmium sulfide middling was added, ions, As, Sb were oxidized with air oxygen for 3.5 hours, the pH of the solution was adjusted to 5.0, filtered, the purified solution was Cd 119.94 g / l, Fe 15 mg / l, AS 0.5 mg / l, Sb 2.7 mg / l. 0

Contributed to cadal: with a solution of 26.3 g, middling 0.36 g total of 26.69 g.

Cadai;, Trastinge 24.95 g, - in the sediment 1.71g.

12

Loaded. 8.7 g /

310 0.72

43.2 0.23

55.0 0.36

68.0 0.57

710, 0.72

8 12

0.75

200131.58.3 2.84 8007501.83230

200131.58.3 18.6 80075012210

20014121.5 1.5 9003101,19211

200 93.18.2 2.2 60026002,56212

200131,58,32,848007501,83208

200 93.18.2 2.2 6002602,56240

2001043.0 0.9 207703,24224

200100,65,6 4,7 9504603,3204

Removing cadmium in solution to a total load of 93.5%, i.e. cadmium loss is 6.5%.

The consumption of iron sulfate 1.54 g in the experience or 7.7 g / l of the purified solution. The amount of cadmium in the sediment is 1.71 g, which is more (0.36 g) of the amount of cadmium introduced with the sulphide cadmium middling, therefore, the extraction of cadmium is enhanced by the addition of cadmium with the activating additive (see Table 3, Experiment 3).

PRI mme R 2. 200 ml of a solution containing, g / l:

Cd 104.1; Zn 3.0; Fe 2.2; As 0.6; Sb 0.26 (ratio Fe: (As + Sb) 2.56), heated to neutralized to pH 3.5, added 2 g of cadmium sulfide residue of the same composition (10 g / l), iron impurities were oxidized for 3.5 hours with air oxygen, the pH was adjusted to 5.0 with soda ash. The purified solution has the composition: Cd 90.45 g / l, Fe 25 mg / l. Az 0.1 mg / l, Sb 1.4 mg / l.

Made by cadmium: with a solution of 20.82 g, with a residue of 0.72 g, a total of 21.54 g.

Received cadmium: in a solution of 20.26 g, in the sediment 1.38 g

Removing cadmium in solution to 81%, i.e. cadmium loss of 19%, common load - 94.06% (see table. Consumption of iron sulfate 10.24 g experience 6), i.e. cadmium loss of 5.94%. or 51.2 g / l of the solution to be purified.

The consumption of ferrous sulfate is 5 g / l. The consumption of ferrous sulfate is an iron-dependent solution (1 g in the experiment). 10 sieves from iron and impurities

in the original solution. For cleaning

EXAMPLE 3 (according to the known solutions given in the table, I can, see table., Experiment 2), according to the conditions of the known method, 200 ml of solution containing g / l is necessary: enter cd 131 ferrous sulphate ,five; Zn 8.3J Fe 2.84, As 0.8; 15 8-30 cleared solution. For Sb 0.75 (ratio Fe: (As + Sb) cleaning solutions according to the proposed

1.83), heated to 70 ° C;

iron sulfate - 8.7 g per 200 ml, iron to the amount of impurities was adjusted and pH was adjusted to 3.5, antimony was oxidized, as in experiment 2. With less iron and oxygen impurity, 20 is the ratio (see Table 3, experiment 3), for 4 hours, adjusted the pH of the solution, even with the introduction of the activating agent up to 5.0, filtered. Purified troughs not reached. The required solution has the composition: Cd 101.4 g / l, degree of purification.

Zn 6.5 g / l, Fe 25 mg / l. As 0.5 mg / l. Data on the implementation of the method in Sb 5 mg / l. 25 different conditions are given in the table.

4, 9

98.4 6.5 25 10 15.5 10.5 35.9 3.56

101.4 6.525 0.55 ,,

125 19.45 1011.38,729.6

80.94 6.55.0 5.06.07.223.5

119.94 9.615 0.52.78.320.6

76.0 5.70.9 0.52.86.525.1

90.45 5.625 0.1145.823.7

95.5 7.425 0.51.66.322.7

 -

12948524

Contributed by cadmium, with a solution of only 26.3 g.

Received cadmium: in a solution of 21.29 g, in the sediment 4.89 g

Extracting cadmium into the solution is enough for the ratio

86

14

The introduction of a cadmium sulfide middling product into the cleaning process is less than 5 g / l to achieve a deep degree of purification (see tab., Experiment 4). The use of sulphide cadmium middling more than 10 g / l does not improve the degree of purification and does not give a further reduction in cadmium losses (omiT 8).

Use in the cleaning process of cadmium-, zinc-containing solutions from impurities of the mouse antimony as an activating additive of the sulfide cadmium middling in the amount of 5-10 g / l (or 4-8 wt.h. per 1000 wt.h. solution), introduced before oxidation allows to reach deep

Editor N.Egorova Order 564/28

Compiled by L.R. Kin

Tehred LoOleinik 1 Proofreader M. Demchik

Circulation 605 - Subscription VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod Project Project, 4

cleaning degree, reduce cad-loss. Mic 8-15% compared with the known; method and reduce the cost of the process by eliminating the introduction of additional amounts of iron sulfate

Claims (1)

Invention Formula The method of purification of cadmium sulfate, zinc containing solutions from arsenic and antimony impurities, including neutralization to pH 3.5-5.0 oxidation of iron and impurities with oxygen in the air, characterized in that, in order to reduce cadmium losses and reduce the cost of the process, before oxidation to a solution Lpid cadmium middlings are administered in an amount of 5-10 g / l.