Method of nickel extraction
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.
SUBSTANCE: method includes copper sedimentation by solution contact with copper-bearing clinker. Before sedimentation clinker is treated with solution containing sulphydric collector, for instance solution containing 0.5-10 g/l of xanthate, during 15-30 minutes. After treatment clinker is contacted with copper-bearing solution.
EFFECT: improving clinker sedimentary capacity, rate and degree of copper sedimentation.
1 tbl, 1 ex
SUBSTANCE: method involves treatment of rock with a sodium cyanide solution with formation of dispersion of rock particles with gold compound in the form of Na[Au(CN)2], which is dissolved in it. Then, particles are removed from the dispersion so that clarified solution of gold compound is obtained. Clarified solution contacts a solid zinc source so that their products are obtained as a result of reactions of ionic exchange and replacement in the form of water solution of zinc compound Na2[Zn(CN)4] and solid phase of gold. Solid phase of gold is separated and processed so that metal gold is obtained. As zinc source there used are particles of zinc hydroxide consisting of a composite sorbent dispersed in water, consisting of cellulose fibres with particles of zinc hydroxide, which are immobilised with them at their chemical deposition. Solid phase of gold is extracted in the form of its hydroxide.
EFFECT: accelerating and simplifying the process.
4 cl, 3 ex
SUBSTANCE: invention can be used for extraction, concentration and cleaning of molybdenum from companion elements (Fe3+, Cu2+, Zn2+, Ni2+, Co2+, Al3+, Sn4+, Sb3+, rare-earth elements3+, etc.) at processing of different liquid and solid molybdenum-containing wastes and middling products. Extraction method of molybdenum from diluted acid solutions containing companion elements of molybdenum involves molybdenum deposition in the form of its salt. Besides, deposition with molybdenum purification is performed in the form of its cesium salt of 12-molybdophosphoric acid containing the following: Cs3-xHxPMo12O40·nH2O (x=0-1, n=9-12). Deposition is performed at heating up to 40-80°C by subsequent addition of orthophosphate-ion in the form of soluble phosphate or orthophosphoric acid, strong acid, for example sulphuric acid or sodium hydroxide up to pH 1-3 and soluble cesium salt, including mother solutions obtained during leaching of pollucite.
EFFECT: increasing extraction degree of molybdenum from process and effluent solutions.
2 dwg, 3 ex
SUBSTANCE: reduction is performed with hydrogen generated in solution; at that, reduction is catalysed with reduced metal itself, which is contained in finely dispersed state. Reduction process is performed in multi-pass reactor at variable pressure that is changed with frequency of 1-5 Hz from maximum to minimum values of 8 kg/cm2 to 0.25 kg/cm2. Extraction plant of metals capable of hydrogen absorption from solutions includes dosing device, modified displacement pump, electrolyser for hydrogen generation and multi-pass reactor in the form of labyrinth.
EFFECT: simplifying the process and improving the purity of extracted metal.
10 cl, 9 dwg, 8 tbl, 4 ex
SUBSTANCE: procedure for treatment zinc containing gold-silver and/or silver-gold cakes consists of sulphuric acid leaching with aeration by air or mixture of gases oxygen-air and in filtration of pulp with production of filtrate containing compounds of zinc, copper and selenium. Selenium is cemented from filtrate with metallic copper. Pulp is filtered and there is produced copper containing selenium cake and the second filtrate. At pH 1.0÷3.0 copper is cemented from the second filtrate with addition of at least one equivalent of metallic zinc. Upon total dissolution of zinc pulp is filtered and there is produced copper containing cake and the third filtrate containing sulphate of zinc. The third filtrate is electrolysed; there is produced cathode zinc. Spent electrolyte is returned to leaching zinc containing gold-silver and/or silver/gold cake.
EFFECT: reduced consumption of sulphuric acid and water at processing zinc containing silver-gold cyanic cakes into commodity silver-gold alloy, metal zinc, metal copper and selenium-cooper product.
16 cl, 1 tbl
SUBSTANCE: here are disclosed 2 versions of fabrication of high porous silver sponge where as source of silver there are used silver salts or silver alloys successively converted into salts. The versions of the procedure consist in preparing concentrated chloride solution whereat silver salt is dissolved in accordance with its solubility at temperature of solution boiling. Salt of polyvalent metal of lead chloride at amount equal to amount of dissolved silver is introduced into prepared solution. Further, silver-lead sponge is settled with zinc. Contaminating substances and lead are removed from settled sponge which is successively washed and dried.
EFFECT: accelerated production of silver sponge due to reduced time for its sedimentation; qualitative stable high porosity of produced silver sponge.
2 cl, 1 dwg, 1 tbl, 3 ex
SUBSTANCE: procedure consists in settling silver with addition of zinc powder. Before sedimentation of silver zinc powder is preliminary activated in 1-5 % solution of HCl at temperature 80-100°C. Lead chloride at amount of 2-15 g/dm3 is added into chloride solution before sedimentation. The procedure of sedimentation consists in adding activated zinc powder to chloride solution heated to 50-60°C and in successive conditioning for forming a lead sponge and sedimentation of silver on it. After conditioning the formed sponge is broken and solution is mixed. Activated powder of zinc is added in big portions.
EFFECT: raised efficiency of chloride solution purification, increased output of silver, reduced consumption of zinc and time of sedimentation, and thereby reduced cost of process.
2 cl, 1 tbl, 3 ex
SUBSTANCE: inventions relate to gold extraction from solutions with low concentration at presence of ions of other metals, for instance cleaning solutions of gold-extracting plants, brines of potassium manufacturing, geothermal water, water of brine lakes and salt water. Essence consists in that through powder of metal-restorative it is passed gold-containing solution with low concentration at presence of ions of other metals during 2-240 hours. In the capacity of metal-restorative it is used lead-plated zinc powder of grade +0.001 mm - 2 mm with lead content 1-90 wt %. or powders of metals, used at temperature of solution not less than 50°C and selected from the group: Zn, Fe, Ni, Pb, Sn, Sb, of grade +0.1 mm - 5 mm. Additionally before cementation powders are placed in cartridge. Received after cementation gold-containing concentrate is separated by means of intensive mechanical agitation, it is treated by nitric or acetic acid. Gold sediment is separated by filtration, dried and molten with fluxing additives with receiving of crude metal.
EFFECT: increase of effectiveness and selectivity of gold extraction from solutions with low concentration.
3 cl, 1 dwg, 3 ex
FIELD: process engineering.
SUBSTANCE: invention relates to process engineering and can be used for processing antimony-based alloys containing noble metals in concentrations over 0.1%. Proposed method comprises dissolving alloys in solution containing acid and extracting noble metals from said solution by cementing. Prior to dissolving alloys, lead is remove therefrom by processing with solvent. Alloys are dissolved by solution containing hydrochloric acid and hydrogen dioxide or sodium persulphate. Noble metals are cemented by antimony-based alloys with minor concentration of noble metals or cathode antimony powder with grain size varying from 100 to 74 mcm, or by gold-antimony flotation concentrate with grain size varying from 100 to 74 mcm to produce an alloy enriched with noble metals cements noble metals. Now, noble metals are extracted from obtained products.
EFFECT: treatment of alloys with wide range of noble metal concentrations within 0,1 to 1,3 %.
4 cl, 2 tbl, 5 ex
FIELD: process engineering.
SUBSTANCE: invention relates to process engineering and can be used in gold cementation with rotary solution flow. Proposed device comprises metal cementing gadget, initial solution inlet branch pipe, solution outlet branch pipe, cementation product discharge branch pipe and vibrator with vibro drive. Device incorporates two tanks representing spiral of Archimedes and arranged one above the other around central common perforated pipe with rubber shock absorbers made on every tank. Aforesaid metal cementing gadget is arranged in baskets mounted inside said tanks. Solution discharge branch pipe is located at lower tank bottom. Basket accommodating said metal cementing gadget represents a vessel with walls perforated along solution flow, holes diameters varying from 2 mm to 3 mm. Vessels arrangement allows working solution to flow in opposite directions.
EFFECT: increased rate of cementation.
7 cl, 1 dwg
SUBSTANCE: proposed method comprises reduction of nickel using hydrate of sodium and bulk oxygen at mixing. Nickel is reduced at 700±10°C, consumption of bulk oxygen of 1.5-1.7% of the product weight and mixed for 10-15 min. Associated copper is separated by magnetic separation directly from fusion cake with temperature of 340-350°C. Note here that nickel deposit concentrated at magnetic rods and including alkaline fusion cake is subjected to flushing of sodium hydrate and sodium sulphate by water to wash off nonmagnetic sold particles of copper and separation of phases by centrifugation. Magnetic nickel precipitate is then washed off in water after demagnetisation of magnetic rods to obtain dehydrated nickel.
EFFECT: direct reduction of nickel with associated copper separation.
SUBSTANCE: proposed method comprises leaching by chloride solution at feed of oxygen and chlorine. Then, copper is precipitated from said solution to obtain copper sulfide cake and said solution of cleaned of iron, zinc and cobalt. after cleaning nickel is electrically extracted from the solution while effluent is processed to recover chlorine and alkali. Note here that leaching is performed in two steps with solution backflow. Note here that only oxygen is fed to said first step while only chlorine is fed to said second step.
EFFECT: ruled out losses of nonferrous metals, lower costs.
5 cl, 5 tbl, 7 ex
SUBSTANCE: as an extracting agent, hydrazides are used, which are based on synthetic α-branched tertiary carboxylic acids of common formula: CH3R1R2CC(O)NHNH2, where R1 and R2 are alkyl radicals, and sum of carbon atoms is equal to 10-19. At that, at extraction the extracting agent is taken in the form of 0.2-0.4 mol/l of the solution mixed with hydrocarbon solvent with 10 vol. % of 2-ethylhexanol.
EFFECT: high degree and selectivity of extraction of nickel in presence of iron, cobalt or zinc.
6 cl, 2 dwg, 9 tbl, 10 ex
SUBSTANCE: method involves leaching of matte using a nickel solution at increased pressure and temperature so that nickel sulphate solution is obtained. Nickel sulphate solution is cleaned from impurities of iron, copper and cobalt, and nickel is extracted by means of electrowinning from clean solution of nickel sulphate so that cathode nickel and sulphuric anolyte containing nickel sulphate and sulphuric acid is obtained. Sulphuric anolyte is subject to extraction treatment using a mixture of tertiary amines and aliphatic alcohols as an extracting agent with extraction to the extract of sulphuric acid and obtainment of sulphuric raffinate and extract. Sulphuric acid is re-extracted with water from the extract, and sulphuric raffinate is supplied to leaching of the matte.
EFFECT: increasing the effectiveness of nickel matte processing method owing to extracting sulphuric acid in the form of additional product at simultaneous obtainment of metallic nickel K-1Ay; reducing nickel losses of its content in anolyte; reducing the number of reagents and simplifying the method.
10 cl, 1 dwg, 5 ex
SUBSTANCE: proposed method comprises anodic oxidation of melt in acid electrolyte at application of electric current. Note here that said anodic oxidation is carried out in acid electrolyte containing 150 g/l of H2SO4+50 g/l HCl. Applied direct electric current features density of 250-300 mA/cm2. Application of said current is conducted at 20-40°C.
EFFECT: notable increase in anodic oxidation rate.
3 tbl, 2 ex
SUBSTANCE: proposed method comprises ore pretreatment by crushing, classification and grading, biological degradation of ore silicate minerals by multiple ore interaction with silicate bacteria cultural medium without mixing with replacement of said cultural medium at pH, at least, 0.4. Then, metals are leached from biological degradation cakes by cultural solutions after extraction of silicon therefrom and additions of sulfuric acid to concentration of 50-450 g/l. After leaching, metals are extracted form cake leaching solution. Note here that cultural medium is replaced on reaching redox potential in solution of minus 250 mV. After biological degradation and before leaching, cakes are flushed with water.
EFFECT: higher degree biological degradation, yield of metals, and lower costs.
10 cl, 2 ex
SUBSTANCE: extraction of non-ferrous metals is performed in plasma electric arc furnace of alternating current, which has a group of electrodes and contains a molten liquid copper bath coated with liquid slag. The method involves a melting-reducing stage consisting of the following operations: loading of metallurgical wastes onto the surface of liquid molten copper bath, melting of metallurgical wastes in liquid slag at the slag/bath copper boundary, reduction at least of non-ferrous metals to the oxidation degree, which is more than or is equal to zero, and intensive mixing of the liquid molten copper bath by blowing of inert gas, preferably nitrogen and (or) argon. Mixing is performed so that it can be possible to avoid the formation of a crust, expedite the reduction reaction and cause the transition of copper-soluble non-ferrous metals to the molten copper.
EFFECT: increasing the extraction of non-ferrous metals from wastes.
16 cl, 9 tbl, 2 ex
SUBSTANCE: method involves the following steps at which: initial material is processed into the ash containing the metals subject to regeneration, which have been chosen from the metals including vanadium, metals of group 8-10 and metals of group 6; the above ash is leached by leaching solution so that the first solid substance is obtained, which contains metals of group 8-10, solid carbonaceous material and supernatant fluid containing vanadium and metal of group 6; supernatant fluid is mixed with solution of ammonia sulphate and the deposit containing vanadium and additional fluid containing metal of group 6 is obtained; additional supernatant fluid is mixed with leaching solution, solution of ammonia sulphate and solution of sulphuric acid and the deposit containing metal of group 6 is obtained.
EFFECT: methods are effective for regeneration of metals without formation of other undesirable by-products.
10 cl, 9 dwg, 12 tbl, 3 ex
SUBSTANCE: method includes leaching of ground raw materials in a solution of sulphuric acid with concentration of more than 2.0 g/l, containing ions of trivalent iron of more than 10-12 g/l, while mixing, at the temperature up to 100°C, solid phase content to 60%, at least in two serially connected reservoirs. The pulp discharged from the last reservoir is separated into solid and liquid phases. At the same time the solid phase is returned for leaching into the first reservoir. Iron oxidation in the liquid phase is carried out with iron-oxidising bacteria adsorbed on a neutral carrier at the pH 1.4-2.2 and 90°C with aeration by gas containing oxygen and carbonic acid. Then the liquid phase is returned after iron oxidation into leaching reservoirs, and metals are extracted from the produced phases. Besides, leaching is carried out with aeration by oxygen-containing gas. The pulp discharged from each reservoir is separated into solid and liquid phases. The solid phase is sent for leaching to the next reservoir, and the liquid phase is prepared prior to oxidation with bacteria. Duration of leaching is increased in each subsequent reservoir.
EFFECT: higher speed of bacterial iron oxidation and efficiency of sulphides dissolution, reduced dimensions of devices for bacterial oxidation of iron.
13 cl, 3 ex
SUBSTANCE: method involves construction of leakproof bottom, formation of ore pile on it, erection of sprinkling and drainage system, and in case of underground leaching - construction of pumping-in and pumping-out openings in ore deposit place; sprinkling of ore pile or supply to pumping-in openings of leaching reagent containing acid solution or acid solution in presence of reducing agent, so that production solutions containing nickel, cobalt, iron, aluminium and magnesium are obtained; their processing with extraction of nickel and cobalt; reinforcement of mother solutions with leaching reagent and their return for leaching. As leaching reagent there used are products of incomplete sulphur oxidation, which are supplied in the quantity sufficient for transition and maintenance of nickel and cobalt in the solution, as well as conversion of Fe3+ ions to Fe2+ in production solution, the pH value of which is maintained at the interval of values of 1.5-4.5, oxidation-reduction potential value is not more than 350 mV; at that, extraction of nickel and cobalt is performed using sorption, extraction and deposition methods with further reclamation of waste ore pile and reusable solutions or underground water involved in recycling.
EFFECT: increasing complete combustion of powder charges and efficiency of action of charges; increasing efficiency of extraction of nickel and cobalt; reducing consumption of acid and simplifying the flow diagram.
18 cl, 4 tbl, 4 ex
FIELD: metallurgy, in particular complex metal recovery from oxidized ore.
SUBSTANCE: claimed method includes granulation with sulfuric acid. Obtained granules are sulfated at 250-4500C for 1-2 h in one or two steps. Then leaching of nickel and other metal sulfates are carried out followed by metal recovery using known methods. Invention is useful in reprocessing of oxidized nickel-cobalt ores, as well as laterite ores containing nickel, cobalt, and copper, and iron-manganese nickel-containing nodules.
EFFECT: high yield nickel recovery; inexpensive and usable equipment.
3 cl, 3 tbl, 4 ex