Method for gold extraction from cyanide solutions with dissolved mercury contained in them |
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IPC classes for russian patent Method for gold extraction from cyanide solutions with dissolved mercury contained in them (RU 2460814):
Method of gold extraction from mercury-containing cyanic solutions / 2458160
Method of gold extraction from mercury-containing cyanic solutions consists in sorption by ion-exchange resin of AM-2B mark. Then mercury de-sorption is carried out from saturated ion-exchange resin at a temperature 40-50°C and for 6 hours and aurum de-sorption. Note that mercury de-sorption is done by solution containing sulfuric acid 30-50 g/l with the presence of hydrogen peroxide 5-10 g/l.
 Apparatus for extracting mercury from fluorescent lamps / 2447167
Apparatus contains a unit for crushing fluorescent lamps and a decontamination unit. The crushing unit is in form of a drum with revolving blades for crushing the glass of the lamps, a conveyor and a tray for feeding glass into the decontamination unit. The decontamination unit is in form of a mixer for a demercuration solution and the processing milling agent, which is mounted on a base with possibility of being rotated by a drive and tipping over in order to unload the processed product, a container for collecting the processed product which is mounted on a movable tray with a gutter for draining the spent solution, and a receiving tank from which spent solution can be pumped through a filter with a sulphonated carbon KU-2 filling and then taken for burning in a furnace to obtain mercury metal. The demercuration solution contains potassium permanganate KMnO4 - 0.0002525 g/l, hydrochloric acid HCl -0.000125 g/l and process water - 0.0375 g/l for one recycled fluorescent lamp. Said solution is at 28°C.
 Procedure for extraction of mercury from fluorescent lamps / 2432383
Procedure for extraction of mercury form fluorescent lamps consists in lamps crushing, in loading scrap into container and in removal of mercury from lamps scrap in bath with solution during 1.5 hour. Further, the container is set on a tray for solution drainage. Scrap and accessories in containers are transported to a classification line. Spent solution is collected into a receiving tank and pumped over through a filter with a sulphonated coal. The filter with sulphonated coal is burned and there is produced metal mercury. Solution is collected for repeated preparation or for draining into sewage.
 Procedure for extraction of mercury out of mercury-selenium final tailings / 2425160
Procedure for extraction of mercury out of mercury-selenium final tailings consists in introduction of mercury selenium final tailings into pulp of calcium hydroxide and in re-pulping produced mixture, in burning in tubular furnace and in withdrawing process gases of burning containing vapours of mercury into condenser, in condensing mercury out of process gases, in production of stupp and in removing mercury from stupp. Also, mixture re-pulping is performed at ratio of hydroxide of calcium and selenium in final tailings Ca(OH)2:Se final tailings=(3.0-3.5):1. First, there is burned re-pulped mixture producing process gases not containing elementary selenium, further there is burned stupp upon its removal. Burning is carried out in a rotating tubular furnace at excess of oxygen. Output of mercury comes to 99 %. There is produced mercury-less ash with maximal content of bound selenium suitable for successive extraction of selenium.
 Procedure for extraction of mercury from spent catalyst at hydro-chlorination of acetylene / 2402623
Procedure consists in combustion of spent catalyst of acetylene hydro-chlorination in air and in successive cooling combustion products for condensation and extraction of metal mercury and for neutralisation of fumes. Neutralisation is performed with solution of alkali producing water-salt solution with mercury oxide. Mercury oxide produced in the process of neutralisation is filtered from water-salt solution. Further, mercury oxide is directed to recycle and mixed with source spent catalyst for successive decomposition releasing metal mercury at combustion of spent catalyst.
 Method of thallic amalgam wastes treatment / 2401313
Proposed method comprises decomposing wastes in electrolyte solution containing sulphuric acid and hydrogen dioxide. Note here that redox potential varies from initial potential of thallic amalgam of -0.35 V to that of mercury of +0.69 V to produce pure mercury and saturated electrolyte. Note here that saturated electrolyte is in equilibrium with univalent thallium sulphate precipitate that is extracted by filtration and used as finished high-purity chemical reagent.
Method for demercuration of mercury-containing wastes for recycling said wastes / 2400545
Method involves treatment of wastes with a calcium polysulphide solution. Before treatment with the calcium polysulphide solution, the wastes are mixed with an oxidising agent which contains active chlorine in amount of 0.15-10.0 % of the weight of the wastes. Water is then added and the mixture is held. The obtained mixture is treated with a calcium polysulphide solution in ratio of calcium polysulphide solution to the mixture equal to 1-4:10 wt % respectively, and the reaction mixture is then held.
 Installation for recycling of luminescent lamps and method for their recycling / 2365432
Invention is related to the field of environment protection and may be used to recycle spent and defect luminescent lamps. Installation for recycling of luminescent lamps includes system of exhaust ventilation connected to chamber of lamp breakage cleaning from phosphor equipped with loading unit with flap gate and grinder, and also unit for unloading of cleaned components of lamp breakage. Chamber of lamp breakage cleaning from phosphor is arranged in the form of double cyclone that consists of coaxial upper and lower cyclones, besides, upper cyclone is partially located in lower cyclone and is equipped with loading unit with tangential nozzle for input of air mixture of lamp breakage fractions. Lower part of lower cyclone is arranged in the form of collector of lamp breakage components cleaned from phosphor, which represent mixture of relatively heavy fractions, and is equipped with unit for unloading of these fractions, which is arranged in the form of hinged flap gate. In upper part of lower cyclone, which is located higher than output cut of upper cyclone, tangential nozzle is installed, being connected to system of exhaust ventilation for exhaust of air mixture of relatively light fraction, which represents powdery phosphor. Output cut of tangential nozzle of upper cyclone is oriented along with central vortex flow in this cyclone, and input cut of lower cyclone tangential nozzle is oriented opposite to peripheral vortex flow in lower cyclone. Method for recycling of spent luminescent lamps realised in above mentioned installation consists in the fact that recycled lamps are individually damaged, and central vortex flow of fractions air mixture is formed from lamp breakage, which is transformed into oppositely twisted peripheral vortex flow. From area of central vortex flow transformation lamp breakage is separated, as mixture of relatively heavier fractions, and also phosphor as relatively light fraction, which is sent for catching of phosphor. Relatively heavier fractions, in the form of lamp breakage cleaned from phosphor, are taken out by gravity to further processing.
Method of mercury removal from mercury-contaminated solutions / 2350672
Invention refers to method of mercury removal from mercury-contaminated polluted alkali or alkali alcoholate spirit. Mercury-contaminated alkali or alkali alcoholate spirit is filtered through coal at first and then through inert fibrous material. Filtration is followed with introducing distillation column into solution over the bottom. Water or spirit are reduced, while mercury-depleted alkali or spirit are delivered to the column bottom.
 Method of mercury-antimonial concentrates reprocessing / 2350669
Method includes concentrate leaching by spillage solutions of sulfureous sodium in solution of caustic soda with receiving solutions of sodium tri-sulphantimonite and mercury- sodium sulfide complex and insoluble residue and direction of received solution to electrolysis. Additionally electrolysis is implemented with extraction of stibium and mercury in the form of cathodic mercury-antimonial metal, 70% of electrolyte after electrolyze electrolysis is returned to leaching of concentrate. From cathodic mercury-antimonial metal by distillation by means of heat treatment it is removed mercury with receiving of mercury of grade P-1. Distillation residual is directed to reverberatory process and refinement for receiving of stibium Cy0, Cy00.
Method of extracting gold using macroporous resins / 2459880
Proposed method comprises preparing leaching solution bearing gold, and gold sorption by macroporous resin containing alkyl amine functional groups in amount of 0.01-1.0 mmol/g and 3-12% of cross-links with water retaining capacity making, at least, 30%, and specific surface area varying from 400 to 1200 m2/g. After sorption, gold is eluted.
Method of phosphogypsum processing for manufacture of concentrate of rare-earth elements and gypsum / 2458999
Method of phosphogypsum processing involves leaching of phosphogypsum with sulphuric acid solution with change-over of phosphorus and rare-earth elements to the solution, and gypsum residues is obtained, rare-earth elements are extracted from the solution and the gypsum residue is neutralised with the main calcium compound. In addition, leaching is performed with sulphuric acid solution with concentration of 1-5 wt %. After that, rare-earth elements are extracted from the solution by sorption using sulfocationite in hydrogen or ammonia form with further desorption of rare-earth elements with ammonia sulphate solution. After desorption to the obtained strippant there added is ammonia or ammonium carbonate with deposition and separation of hydroxide or carbon-bearing concentrate of rare-earth elements. Extraction of rare-earth elements of medium and yttrium groups to concentrates is 41-67% and 28-51.4% respectively. Specific consumption of neutralising calcium compound per 1 kg of phosphogypsum has been reduced at least by 1.6 times.
 Multicolumn sequential extraction of ionic metal derivative / 2458725
Invention may be used in hydrometallurgy. Proposed invention allows separating such metals as uranium, nickel, copper and cobalt present in liquid wastes of ore leaching. Solution containing metal ions is forced through stationary layer of resin, Particularly, through, at least, three zones. Note here that solution drive appliances are arranged between adjacent zones and between last and first zones. Proposed method comprises several sequences, each comprising, at least, one step selected from steps of adsorption, washing and desorption. Every next sequence is performed by shifting fronts into zones downstream of circuit with identical increment unless cyclic shift of inlet and discharge points.
 Method of ion-exchange uranium extraction from sulfuric solutions and pulps / 2458164
Method includes uranium sorption by anion exchange resin, uranium de-sorption from saturated anion exchange resin by sulphuric acid and obtaining finished product from strippant. Note that uranium de-sorption from saturated anion exchange resin is done by sulphuric acid solution with concentration 70-100 g/l with the presence of 1-2 mole/l of ammonia sulphate.
Method of gold extraction from mercury-containing cyanic solutions / 2458160
Method of gold extraction from mercury-containing cyanic solutions consists in sorption by ion-exchange resin of AM-2B mark. Then mercury de-sorption is carried out from saturated ion-exchange resin at a temperature 40-50°C and for 6 hours and aurum de-sorption. Note that mercury de-sorption is done by solution containing sulfuric acid 30-50 g/l with the presence of hydrogen peroxide 5-10 g/l.
 Extraction method of amount of rare-earth elements from solutions / 2457266
Extraction method of rare-earth elements from solutions containing multiple excess iron (III) and aluminium, with pH=0.5÷2.5 involves sorption using macroporous sulfocationite as sorbent. At that, as sorbent there used is macroporous sulfocationite containing more than 12 to 20% of divinyl benzene.
 Method for extracting metals from depulped ores / 2454470
Method for extracting metals from depulped ores involves crushing, ore depulping in leached solution and sorption of metal. Leaching is performed in ultrasound pulp cavitation mode. Metal sorption on ion-exchange resin is performed from pulp filtration solution in intensity field of alternating current in sorption activation mode of extracted metal and suppression of sorption of impurities. At that, polarity of electrodes is constantly changed to avoid deposition of metal on cathode. Leaching and sorption of metal is performed in a unit providing solution circulation till the specified completeness of leaching from ore and its complete sorption on ion-exchange resin is achieved.
Method for sorption extraction of iron from nitrate salt solutions / 2453368
Invention relates to ion exchange and can be used for sorption extraction of iron from salt solutions formed when processing aluminium-containing material using acid techniques. Extraction of iron to residual content of Fe2O3 in the purified solution of not more than 0.001% is carried out through sorption of iron with a cationite in H-form, containing aminodiacetic functional groups. The iron sorption and desorption steps are alternated without intermediate washing of the cationite. Iron is desorbed in counterflow conditions with nitric acid solution.
 Method for extraction of palladium (ii) from wasted catalysts / 2442833
The invention relates to hydrometallurgy of precious metals and can be used to extract palladium from wasted catalysts, including catalysts of low-temperature oxidation of carbon oxide (II) based on γ-Al2O3, containing palladium chloride (II) and cupric bromide (II). The method includes acid leaching of palladium from wasted catalysts from the chloride solution. Furthermore, the acid leaching is carried out by 1 M solution of hydrochloric acid. The resulting solution is diluted with water to pH 1. The sorption of palladium is carried out from the diluted solution using chemically modified silica containing grafted groups of γ-aminopropyltriethoxysilane.
Extraction of gold, palladium and platinum from chloride solution / 2441929
invention refers to the area of the extraction of gold, palladium and platinum from hydrochloric solutions. The method comprises their anionite sorption and desorption. The sorption shall be performed with low-basic anionites. After sorption, desorption with a mixture of sodium sulfite salts mixture Na2SO3 and sodium nitrite NaNo2.
Method of extracting gold using macroporous resins / 2459880
Proposed method comprises preparing leaching solution bearing gold, and gold sorption by macroporous resin containing alkyl amine functional groups in amount of 0.01-1.0 mmol/g and 3-12% of cross-links with water retaining capacity making, at least, 30%, and specific surface area varying from 400 to 1200 m2/g. After sorption, gold is eluted.
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FIELD: metallurgy. SUBSTANCE: method for gold extraction from cyanide solutions with dissolved mercury contained in them, gold-bearing ores formed during leaching, involves sorption of gold and mercury on activated carbon with enrichment of activated carbon with gold and mercury. Then, gold desorption is performed with alkali-cyanide solution under autoclave conditions, gold electrolysis from strippants so that cathode deposit is obtained and its remelting is performed so that finished products are obtained in the form of raw base gold alloy. Prior to gold desorption the selective desorption of mercury is performed by treatment of saturated carbon with alkali-cyanide solution containing 15-20 g/l of sodium cyanide and 3-5 g/l of sodium hydroxide, at temperature of 18-20°C and atmospheric pressure during 10 hours. EFFECT: simplifying the method due to mercury desorption in a separate cycle prior to gold desorption; improving selectivity of gold extraction and creation of possibility of safer conditions during processing of cathode deposits so that finished products are obtained. 4 tbl, 1 ex
The invention relates to the field of sorption technology for extracting gold from solutions obtained by cyanide leaching of gold-bearing ore products. Some gold-bearing ores are associated metals, in particular mercury, which reacts with sodium cyanide leaching of gold. Minerals mercury as sulfide and oxidized interact with sodium cyanide with the formation of cyanide complexes Hg(CN)20Hg(CN)31-and Hg(CN)42- In sorption processes using activated charcoal for refining gold cyanide solutions in the presence of dissolved mercury and the concentration of free cyanide ion in the range of 0.5-1.0 g/l dominates sorption maasarani complexes of mercury: neutral Hg(CN)20and single shot Hg(CN)31-having a stronger affinity for activated carbon, than multiply charged anion Hg(CN)42-. It is also known that a neutral complex of mercury Hg(CN)20in the process of sorption significantly competes directly with a singly charged anion gold Au(CN)21-for adsorption places on the surface of activated charcoal and even displaces some amount of adsorbed gold from phase saturated coal [G.J.McDougll, R.D.Hancock, M.G.Nicol. "The mechanism of the adsorption of gold cyanide on activated carbon". - Joumal of the South African Institute of Mining and Metallurgy, September 1980, p.354-355]. When the concentration of free cyanide ion more than 1 g/l in solution are formed complex multiply charged anions Hg(CN)42-weakly sorbed activated carbon and poorly retained in the phase sorbent. The prototype of our proposed method sorption of gold from cyanide pregnant solution leaching of gold-bearing ores in the presence of dissolved mercury may serve process, which includes: - getting busy on gold activated carbon containing and mercury; - joint desorption of gold and mercury-free alkaline-cyanide solution in the autoclave conditions (elevated temperature of 130-150°C and a pressure of 4-5 bar) to obtain commercial decorate containing both gold and mercury; - the joint selection of gold and mercury cathode sludge during electrolysis of a solution of a trademark decorate. The content in the cathode Deposit - up to 50% gold and 3-6% mercury; - removal of mercury from the cathode sludge distillation method (distillation) in a special retort furnaces before remelting rough gold; - heat treated from mercury cathode precipitation flux to obtain the finished product in the form of draft alloy Dore gold, do not contain mercury. In the case of gold and mercury in conjunction retrieved from cyanide solutions on activated carbon almost completely. Separation of mercury from gold is possible only at the stage of distillation of mercury from the cathode Deposit in retort furnaces. ["Introduction to Evolution Design and Operation of Precious Metal Heap Leaching Projects." - Mining Engineering Inc., Colorado, 1988; Mining magazine, November 1987, p.402-403]. The disadvantages of this method of gold extraction are: - a multi-stage process; - selection of mercury together with gold in many operations, which are a source of formation of aerosols, mercury, and increased toxicity in the premises; - the complexity of the removal of mercury from the process; - low efficiency of the process. The problem to address with the proposed method, - preventing mercury in the main loop of the particles of gold from the saturated activated carbon, i.e. carrying out desorption of gold from obtaining a trademark decorate, not containing mercury; electrowinning of gold from commodity decorate with the formation of the cathode Deposit, do not contain mercury; exclusion from the operation of the distillation of mercury from the cathode sludge; melting of cathode gold with flux from receipt of the finished product in the form of draft alloy Dore gold, do not contain mercury. To solve it we need to create conditions for removing mercury from the saturated activated charcoal before desorption of gold. The technical result izobreteniya simplification of the way through the selective desorption of mercury in a separate cycle prior to desorption of gold, improving the selectivity of the extraction of gold and create safer conditions in the processing of cathode Deposit with receipt of the finished product. The technical result is achieved in that in the method of extraction of gold from cyanide solutions present in them dissolved mercury, resulting in the leaching of gold-bearing ores, including gold sorption and mercury on activated carbon with saturation of activated carbon with gold and mercury, desorption of gold in alkaline cyanide solution in the autoclave conditions, the electrolysis of gold from decorativ to produce cathode precipitate and melted with the delivery of finished products in the form of a draft of an alloy of gold ligature before desorption of gold in autoclave conditions hold for the selective desorption of mercury by processing the saturated activated charcoal alkaline-cyanide solution containing 15-20 g/l NaCN and 3-5 g/l of NaOH at a temperature of 18-20°C and atmospheric pressure for 10 hours. The method is as follows. Example: 1. The original saturated activated carbon containing 5.6 mg/l of gold and 7.5 mg/l mercury, processed, alkaline-cyanide solution in a laboratory autoclave at a temperature of 130°C. When the joint desorption of gold and mercury received trademark desorbed containing 238 mg/l of gold and 367 mg/l RT the tee. Electrolysis of dealbata (current - 1A, voltage is 3.4 V, the anode is graphite, the cathode is stainless steel) leads to the formation of the cathode sludge containing 51.5% of the gold and 11.6% of mercury. The resulting product requires additional operations to remove mercury before remelting cathode Deposit and receipt Dore gold. 2. The original saturated activated carbon with a content of 5.6 mg/g of gold and 7.5 mg/g of mercury volume of 50 ml was placed in a laboratory desorption column and in pumping mode Stripping solution containing 20 g/l NaCN+5 g/l NaOH, under dynamic conditions with a speed of 1 rpm./about. coal·h at a temperature of 18-20°C was performed experiments on selective desorption of mercury. The duration of the desorption process is 10 hours. After the end of the experiment desorption of a sample of activated carbon was washed from reagents fourfold volume of water, dried and analyzed for residual mercury content in the activated carbon after desorption. Solutions selective desorption of mercury from the saturated activated carbon with a content of 0.2 mg/l of gold and 200-300 mg/l of mercury fed to the cleanup operation from mercury by precipitation of insoluble precipitate of sulphide of mercury (PRHgs=4,1·10-54)separating the precipitate from the solution by filtration. Free from mercury solutions doubleplay by NaCN and NaOH and return to the process of selective desorption is Tuti. The results of the experiments are given in tables 1-4.
The most effective concentration of NaCN in desorbers solution is 15-20 g/L. recovery of mercury from the activated carbon when desorption was ~ 100%. To increase the concentration of NaCN more than 20 g/l impractical.
The data in table 2 show that the extraction of mercury during desorption excess of 99.5% is achieved when the alkali concentration of 3-5 g/l NaOH.
From the data in table 3 should, Thu the maximum extraction of mercury ~ 100% was achieved at a temperature of 20°C. Increasing the temperature to 30°C leads to a sharp decrease in the degree of extraction of mercury during desorption.
The results, PR is presented in table 4, show that ceteris paribus the maximum recovery of mercury from activated carbon ~ 100% is achieved when the duration of the desorption process 10 hours. Thus, it is experimentally proved that the method of extraction of gold from cyanide solutions present in them dissolved mercury when conducting before desorption of gold operations selective desorption of mercury from compliance options: the temperature of 18-20°C at atmospheric pressure; the concentration of NaCN - 15-20 g/l; the concentration of NaOH - 3-5 g/l; - duration of 10 hours, has a number of advantages: 1. Significantly increases the degree of selective extraction of gold by eliminating competition mercury. 2. The process is greatly simplified by eliminating complex and time-consuming operations of the separation of gold and mercury, as the latter is completely removed before the desorption of gold. The method of extraction of gold from cyanide solutions present in them dissolved mercury, resulting in the leaching of gold-bearing ores, including gold sorption and mercury on activated carbon with saturation of activated carbon with gold and mercury, desorption of gold in alkaline cyanide solution in the autoclave conditions, the electrolysis of gold from decorativ to produce cathode wasp is AC and it melted with the delivery of finished products in the form of a draft of an alloy of gold ligature, characterized in that before the desorption of gold conduct selective desorption of mercury by processing a busy coal alkaline-cyanide solution containing 15-20 g/l of sodium cyanide and 3-5 g/l of sodium hydroxide at a temperature of 18-20°C and atmospheric pressure for 10 hours
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