Method of nickel extraction

FIELD: metallurgy.

SUBSTANCE: proposed method comprises nickel carbonization by forcing nickel salt solution via powder of reduced iron. Said salt solution is forced at the rate of 0.5-1.0 ml/min. Note here that reaction mix is subjected to microwave radiation at frequency of 7.5-10.5 GHz. Said process is conducted at 20-30°C. Nickel salt solution is forced via powder of reduced iron repeatedly at simultaneous microwave radiation effects.

EFFECT: higher degree of nickel extraction.

3 cl, 3 dwg, 1 tbl

 

The invention concerns a method for extracting Nickel from its solution by cementation by passing microwave radiation through the reaction mixture and can be used in hydrometallurgy.

Currently, the processing of highly ferriferous Nickel containing ores in which the iron content of (III) is 50%, and Nickel 2-3%, traditional hydrometallurgical method is not carried out because of the impossibility of separation in a solution of Nickel and iron (III), in the overwhelming number (Alcatel M.I. Processes of cementation in nonferrous metallurgy. - M.: Metallurgy, 1981). When you try to separate the iron and Nickel hydrolytic method formed amorphous, hard filterable iron hydroxide(III), which occupies the entire volume of the pulp. Loss of Nickel with sediment up to 60%.

Therefore, the method of extraction of Nickel from solutions of its salts by carburizing reduced iron by passing microwave radiation through the reaction mixture is important. While the resulting cementation of iron-Nickel scrap with a certain molar or mass balance of Nickel and iron may be used in the manufacture of alloy steels with specified characteristics. Separated from the scrap concentrated solution of iron (III) can be used for the production of gamma micaceous iron pigments.

the C analysis of literary sources should, that earlier study of the process of cementation of Nickel reduced iron scientists were not carried out. This is due to the fact that for the implementation of the cementation process requires that the potential difference exceeded 0.3 (Drozdov BV Kinetics of the cementation process // Journal of applied chemistry. - 1949. - T. - S; Morozenko ELVIRA, S. p. Antonov, Horodynski A.V. Kinetics of contact exchange of copper and iron in sulphate electrolytes // Ukrainian journal of chemistry. - 1975. - V.41. - 1127), and the potential difference between Nickel (-0,25) and iron (-0,44) is very small (less than 0.3) and technological output of this process is very low (Alcatel M.I. Processes of cementation in nonferrous metallurgy. - M.: Metallurgy, 1981).

Data about the possibility of using microwave radiation to accelerate the process of cementation of Nickel in the literature are missing.

Microwave or microwave (MW) radiation is electromagnetic wavelengths from one millimeter to one meter. Microwave radiation is the result of the conversion of microwave emitter of electric energy in the microwave electric field of a frequency of 2450 Megahertz (MHz) or of 2.45 Gigahertz (GHz), when hit in which the molecules and atoms of matter start to rotate with a frequency millions of times per second.

The present invention is to increase the step is no extraction of Nickel from aqueous solution by cementation reduced iron by passing microwave radiation through the reaction mixture.

Microwave radiation is used for more complete extraction of Nickel from solutions of its salts by the method of cementation.

The cementation reaction is heterogeneous, so its acceleration is necessary that the acceleration factor was affected only on the surface where the reaction takes place. This property is microwave radiation.

Under the action of microwave radiation heats not all metal, but only its surface due to the appearance of the skin-effect - reduce the amplitude of the electromagnetic waves as they penetrate deep into the conducting medium. In the case where the metal powder - comentator (iron) is immersed in the salt solution, heats only the surface, which in turn accelerates the process of cementation.

This method has the following advantages: low cost and most energy intensity of the microwave radiation, the direction of energy exclusively to the surface where the reaction takes place.

The proposed method for the extraction of Nickel is illustrated by drawings, presented in figure 1-4.

Figure 1 presents the results of the experiments in table 1, figure 2 diagram of the apparatus used, the high-frequency generator G4-83, figure 3 - view of the device from above, figure 4 - view of the instrument from the front.

In figure 2, 3, 4 positions indicate the following: 1 - the microwave generator; 2 - double T-shaped waveguide tee; 3 - attenuators; 4, 5 - waveguide Yes the Chica with the control and analyze samples; 6, 7 - non-reflective load; 8 detector; 9 amp; 10 - indicating device; a, b - flange mounting the measuring device to the generator and the detector, respectively.

An experiment was conducted on the effects of microwave radiation on the process of cementation of Nickel reduced iron on the above device (1, 2) power of 1 watt. The process of cementation is advisable to carry out at a temperature of 20-30°C and speed of transmission solution with recoverable Nickel through the powder recovered iron 0.5-1.0 ml/min were carried out in Parallel series of experiments, the temperature of their conduct 25°C. the essence of the experiments was as follows. The same glass tube of 4 mm diameter were filled with iron powder. Through the tube at a speed of 1.0 ml/min was passed solution of Nickel sulfate with molar concentration 0,100 M part of the tube was subjected to the microwave radiation frequency of 7.5-10.5 GHz, and the second was not irradiated. The resulting solutions were determined concentration of residual Nickel spectrophotometric method in the form of a complex with dimethylglyoxime. The results of the experiments are shown in table 1 (figure 1). In solutions that are not exposed to microwave radiation, the average Nickel concentration was equal 0,074 M In solutions that were exposed to microwave radiation, the average concentration of Nickel was 0,042 M After the double is propuskanija solution through the iron powder with exposure to microwave radiation, the average Nickel concentration in the solution was 0.025 M, without exposure to microwave radiation - 0,074 M After three transmittance of the solution through the iron powder with exposure to microwave radiation, the average concentration of Nickel was 0,015 M, without exposure to microwave radiation - 0,074 M. the Obtained data indicate that microwave radiation has a positive effect on the kinetics of the process. This allows the use of cementation for separation in a solution of Nickel and iron, receiving the iron-Nickel scrap of a given composition and obtain concentrated solutions of iron(III) for the production of micaceous iron pigments.

1. The method of extracting Nickel from a solution of Nickel salt, including cementation of Nickel from a solution of Nickel salt reduced iron, characterized in that the cementation lead by passing a solution of Nickel salts through the powder recovered iron at a rate of 0.5-1.0 ml/min, while the reaction mixture is exposed to microwave radiation frequency of 7.5-10.5 GHz.

2. The method according to claim 1, wherein the process is conducted at a temperature of 20-30°C.

3. The method according to claim 1, characterized in that a solution of Nickel salts is passed through the powder recovered iron with simultaneous exposure to microwave radiation repeatedly.



 

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1 tbl, 1 ex

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16 cl, 1 tbl

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2 cl, 1 dwg, 1 tbl, 3 ex

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2 cl, 1 tbl, 3 ex

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3 tbl, 2 ex

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10 cl, 9 dwg, 12 tbl, 3 ex

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18 cl, 4 tbl, 4 ex

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EFFECT: high yield nickel recovery; inexpensive and usable equipment.

3 cl, 3 tbl, 4 ex

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