Extraction of fine gold from argillaceous sediments

FIELD: mining.

SUBSTANCE: invention relates to concentration of minerals and can be used for extraction of fine gold from argillaceous sediments. This method comprises preparation of suspension of argillaceous sediments, trapping of fine gold from said suspension by introduction of vegetable material-based sorbent premixed to 0.3 mm grain size in suspension and mixing. Then, sorbent is flushed through 0.3 mm mesh screen, dried and subjected to assay fusion. Note here that suspension is prepared at S:L ratio of 1:25. Sorbent is added to suspension activated in mixer to homogeneous state for 3-5 minutes and, then, mixed for 30-40 seconds. After sorption, loose flakes bearing gold are flushed.

EFFECT: higher yield, environmental safety.

3 ex

 

The invention relates to the beneficiation of minerals and can be used to extract fine gold from clay deposits.

Famous new process for the extraction of gold, based on the change of the surface-active layer of gold particles hydrocarbons. The hydrophobic surface of the gold particles covered with an oil film. Such olefinic particles glomerida into larger clusters, which are extracted by flotation or classification. The agglomerated product is baked, and the resulting burning ash - melting [1].

The disadvantage of this method is a multi-stage extraction process, the necessity of the destruction of agglomerates by roasting.

A known method of separation of finely dispersed metals from mineral products, which consists in the fact that the extraction of gold lead through preparation of an aqueous suspension of gold-bearing material, treatment with iodine in the amount of 300 g/t at pH 8-11 environment with obtaining phase containing the enlarged metal, and separating it from suspensions [2].

The disadvantage of this method is the low efficiency of extraction of gold.

The closest to the technical nature of the proposed solution is the method of extracting the gold from the silt of technogenic deposits, comprising preparing a dry mixture of sludge which deposits with the addition of bleach, preparation of suspension added to the mixture solution of sulfuric acid and subsequent sorption of gold sorbent plant type. Preparing a dry mixture is conducted by mixing the sludge deposits in the form of fractions of particle size less than 0.05 mm with bleach at a ratio of 100:5. Preparation of suspension are added to a dry mixture of 10%aqueous solution of sulfuric acid in the amount of 250 ml and mixing in a mixing device for four hours. Then perform the sorption introduction to the obtained suspension of sorbent vegetables, crushed to a particle size in the range of less than 0.5 and greater than 0.2 mm after thermal treatment at 200°C for one hour and further stirring for 20 minutes. After sorption spend washing the mixture with water on a sieve mesh size of less than 0.5 and greater than 0.2 mm, drying and assay melting [3].

The disadvantages of this method include the need to create conditions for gold dissolution and sorption, which increases the multistage extraction process and reduces its environmental safety.

The technical result of the invention is to improve the extraction of finely dispersed phase of gold from clay sediments effective and environmentally friendly way.

The technical result is achieved in that in the method of extraction of fine gold from g is inistic deposits, comprising preparing a suspension of the clay deposits, the capture of a suspension of finely dispersed gold sorption introduction of the sorbent on the basis of plant material, pre-crushed to a particle size of 0.3 mm in the suspension and stirring, followed by washing of the sorbent on the grid cell size of 0.3 mm, drying and assay fusion, preparation of the suspension is carried out at a ratio of T:W 1:25, the sorbent on the basis of plant material after grinding soak up the loose flakes, sorption was carried out by introduction of a sorbent suspension, activated in a mixing device until smooth in 3-5 minutes, and then stirring in a mixing device within 30-40 seconds after sorption lavage is carried out loose flakes containing gold.

The presence of essential features allows you to capture fine gold directly from the suspension with a fairly high percentage of dispersed gold extraction - more than 70%.

The method is as follows.

Example 1

From 100 g of dry sample size -0,1 mm high-clayey placers "Mad" (Lower Amur)containing 3 g/t gold were obtained suspension at a ratio of T:W 1:25 in a volume of 2.5 L. the Suspension was activated in 3-5 minutes until smooth, made of 5 g of sorbent on the basis of growing the nutrient material. Before making the sorbent on the basis of plant material was ground to a particle size of 0.3 mm and soak up the loose flakes. In activated in a mixing device, a suspension was made of the sorbent and continued stirring for another 30-40 seconds. After sorption was carried out by washing the loose flakes containing gold, on a grid with cell size of 0.3 mm, drying and assay melting.

According to numerous experiments, the gold recovery averaged 72%.

Example 2

One hundred grams of dried sample size -0,1 mm high-clayey placers "Sabrinka" (Lower Amur) with a gold grade of 5 g/t have been subjected to operations as in the first example. According to numerous experiments, the gold recovery was 70%.

Example 3

Similar experiments conducted on a natural clay Deposit "Quiver" (Mykolaiv region) with a gold grade of 4 g/t, where also numerous experiments have been extracting gold on average 73%.

The method allows to increase the recovery of fine fractions of gold, provides environmental safety and does not require expensive equipment.

Sources of information

1. A new process for the extraction of gold Mining magazine, 1990. 163 No. 1. with 62-63.

2. Patent No. 2130499 Russian Federation. The method of separation of finely dispersed metals. / Koltun A.G., Kostylev DS., Yatlukova N.G. 20.05.99.

3. Patent No. 2340689 Russian Federation, IPC C22 is 11/00. The method of extracting the gold from the silt of technogenic deposits. / Litvintsev B.C., Ponomarchuk G.P. and others; applicant and patentee of the Federal state budget. the institution of science Institute of mining, Feb RAS. No. 2007121108/02; Appl. 05.06.2007; publ. 10.12.2008, bull. No. 34. - 5 S.

The way to extract fine gold from clay deposits, comprising preparing a suspension of the clay deposits, the capture of a suspension of finely dispersed gold sorption introduction of the sorbent on the basis of plant material, pre-crushed to a particle size of 0.3 mm in the suspension and stirring, followed by washing of the sorbent on the grid cell size of 0.3 mm, drying and assay fusion, characterized in that the preparation of the suspension is carried out at a ratio of T:W 1:25, the sorbent on the basis of plant material after grinding soak up the loose flakes, sorption was carried out by introduction of a sorbent suspension, activated in a mixing device until smooth within 3-5 minutes, followed by stirring in a mixing device for 30-40 seconds, and after sorption lavage is carried out loose flakes containing gold.



 

Same patents:

FIELD: chemistry.

SUBSTANCE: method includes passing the solution through polymer fibre for sorption of silver ions. After passing the solution, silver ions contained in the fibre are reduced to a metal state with 0.02 M aqueous solution of a mixture of ascorbic acid with glucose in ratio of 1:9. Silver metal is then extracted by burning the silver-containing fibre in an air atmosphere at temperature of 450-500°C, followed by washing the formed silver reguli.

EFFECT: recovering silver ions from industrial waste water, improved method of extracting silver from process solutions used when producing textile materials with antimicrobial properties.

2 ex

FIELD: chemistry.

SUBSTANCE: invention relates to sorption hydrometallurgy of uranium and rhenium and can be used to extract rhenium from solutions and pulp. The method of extracting rhenium from uranium-containing solutions includes sorption of rhenium on anions. Before sorption, fulvic acids are added to the solution until concentration thereof in the solution reaches 25-300 mg/l. Rhenium sorption is carried out at solution pH 2.8-3.5. Sorption is carried out on weakly basic and strongly basic anionites.

EFFECT: improved sorption/desorption properties, high cost/performance ratio of the sorption sorption/desorption process of extracting rhenium from a uranium-containing solution.

2 cl, 6 tbl, 6 ex

FIELD: chemistry.

SUBSTANCE: method includes preparation of phosphogypsum pulp, leaching rare earth metals (REM) and phosphorus with sulphuric acid. After that, pulp is separated into REM and a phosphorus-containing solution and gypsum in the form of insoluble sediment, its neutralisation and REM sorption with cationite from the solution with obtaining mother liquor. After that, REM desorption is performed with obtaining a strippant and separation of REM concentrate from the strippant. Stage leaching is performed in the method, with supply of phosphogypsum to each stage and sulphuric acid to the first stage. Before neutralisation gypsum is subjected to water washing with obtaining a washing solution, supplied to REM sorption with cationite. Sorption mother liquor is divided into two parts, one of which is used to prepare phosphogypsum pulp, with precipitation of phosphorus and fluorine with basic calcium compound from the second one. The obtained sediment is separated from water phase and supplied to utilisation, and water phase is used in circulation.

EFFECT: increased degree of REM extraction from phosphogypsum, reduction of specific costs of chemical reagents with provision of in fact complete water circulation and obtaining gypsum of the required quality by phosphorus and fluorine.

14 cl, 1 dwg, 3 ex

FIELD: chemistry.

SUBSTANCE: invention relates to method of uranium extraction from mother liquors. Method includes obtaining resin, modified by aminophosphonic groups, and obtaining mother liquor, which contains from 25 to 278 g/l of sulphate and uranium. After that, mother liquor is passed through resin, modified by aminophosphonic groups, in acid form to separate uranium from mother liquor. Then, elution of uranium from resin is realised.

EFFECT: possibility of sorption extraction of uranium from solutions, which contain high concentrations of sulfate.

7 cl, 1 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: invention relates to extraction of pure vanadium pentoxide from slag obtained during production thereof. The method involves taking ground vanadium-containing slag, fusion thereof with sodium hydroxide to obtain sodium metavanadate. The sodium metavanadate is then leached with water and the solution is separated from the solid phase. The obtained solution is then mixed with an inorganic acid to achieve pH≤4 and a sorbent is added, the sorbent used being powdered coal which is modified with cation-active nitrogen-containing surfactants. After the sorption process, the spent sorbet is separated from the liquid phase, dried and calcined at temperature of 600-640°C to obtain pure vanadium pentoxide. The cation-active nitrogen-containing surfactants used are, for example, lauryl dimethylbenzyl ammonium chloride, cetylpyridinium chloride and polyhexamethylene guanidine hydrochloride.

EFFECT: wider raw material base for producing vanadium pentoxide, providing high output and high degree of purity of vanadium pentoxide.

4 cl, 1 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: sorption extraction of iron ions from acidic chloride solutions relates to extraction of substances using sorbents and can be used in non-ferrous and ferrous metallurgy and for treating industrial and household wastes. Iron ions are extracted by sorption on anionites of chloride solutions, saturated with chlorides of alkali and alkali-earth metals at temperature of 70-80°C. Sorption is carried out on anionites selected from: AMP, containing exchange groups , and AM-2b, containing exchange groups CH2N(CH3)2,CH2N+(CH3)3.

EFFECT: finding optimum conditions for sorption of iron ions on anionites.

3 dwg, 2 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: invention relates to sorption extraction of cobalt ions Co2+ from acidic chloride solutions and can be used in non-ferrous and ferrous metallurgy, as well as in treatment of industrial and household wastes. Co2+ ions are sorbed from chloride solutions containing ammonium chloride or alkali or alkali-earth metal chlorides on anionites selected from: AMP, containing exchange groups or AM-2b, containing exchange groups wherein the technical result is finding optimum conditions for sorption of cobalt ions on anionites.

EFFECT: high efficiency.

4 dwg, 4 ex

FIELD: metallurgy.

SUBSTANCE: method involves fly ash crushing, removal of Fe by magnetic separation; then, its dilution in a hydrochloric acid so that a hydrochloric leaching product is obtained. Then, adsorption of gallium contained in the hydrochloric leaching product is performed by means of macroporous cationic resin with further production of eluent containing gallium; addition of sodium hydroxide solution to the eluent for carrying out the reaction and obtaining a sodium metaaluminate solution containing gallium. Then, CO2 is added to the sodium metaaluminate solution containing gallium for carbonisation with further separation of gallium from aluminium and production of double aluminium-gallium salt at the gallium to alumina weight ratio comprising more than 1:340. Then, double aluminium-gallium salt is added to sodium hydroxide so that an alkali solution containing gallium and aluminium is obtained, and an electrolysis of the alkali solution containing gallium and aluminium is performed so that metallic gallium is obtained.

EFFECT: simplifying process and increasing gallium extraction degree.

20 cl, 3 dwg, 1 tbl, 10 ex

FIELD: metallurgy.

SUBSTANCE: invention refers to a method for extraction of gallium from fly ash. The method involves crushing of fly ash and extraction of Fe by magnetic separation. Then, it is diluted with hydrochloric acid so that hydrochloric-acid leaching product is obtained, gallium is adsorbed by means of macroporous cationic resin, and further elution is performed so that a gallium-containing eluent is obtained. Then, a masking agent is added for masking of a trivalent iron ion so that a gallium-containing eluent is obtained. After masking is completed, gallium is adsorbed in the eluent by means of macroporous cationic resin with further elution and production of the secondary eluent, solution of sodium hydroxide is added to the secondary eluent for carrying out the reaction, and a deposit is filtered and removed after the reaction is completed. Then, the filtrate is concentrated and an electrolysis is performed so that metallic gallium is obtained.

EFFECT: simplifying process and increasing gallium extraction degree.

19 cl, 2 dwg, 1 tbl, 9 ex

FIELD: metallurgy.

SUBSTANCE: invention refers to processing of tungsten-containing raw material. Tungsten-containing carbonate solution is subject to thickening by means of flocculant VPK 402 for removal from the solution of such impurities as BO33-, PO43-, AsO43- and SiO32. Then, the solution is subject to the first stage of ionic exchange on anionite AB-17-8 in a sulphate shape for removal of a carbonate-ion. At the second stage a tungstate-ion is sorbed. For tungstate desorption a solution containing 50 g/l of (NH4)2SO4 and 200 g/l of NH4OH is used, and for sorption of the carbonate-ion a solution of Na2SO4 with concentration of 190 g/l is used.

EFFECT: separate extraction from tungsten-containing carbonate solution of 98% of tungstate and 98% of sodium carbonate.

1 ex

FIELD: chemistry.

SUBSTANCE: method includes oxidising roasting, percolation leaching of the roasted product with aqueous solution of an oxidising agent or mixtures of oxidising agents to obtain a rhenium-containing solution and an insoluble residue, sorption of rhenium from the rhenium-containing solution in a separate apparatus, drying the insoluble residue, mixing with fluxing agents and fusion on a metal collector. Percolation leaching is carried out at redox potential values of 900-1100 mV and temperature of 50-90°C, with simultaneous sorption of rhenium, followed by desorption and separation of rhenium compounds or rhenium metal from the strippant. The fluxing agents used to fuse the insoluble residue are fluorspar, sodium carbonate and sodium nitrate. Fusion is carried out at temperature of 1200-1800°C on a metal collector in several steps, while discharging the formed slag after each step and fusing the next portion of the mixture on the collector from the previous fusion with separation of the alloy of platinum metals with the collector.

EFFECT: high degree of extraction of rhenium, low reactant consumption, labour input, faster processing of the material, considerable reduction of the volume of solutions which require recycling.

8 cl, 1 dwg, 1 ex

FIELD: chemistry.

SUBSTANCE: method includes passing the solution through polymer fibre for sorption of silver ions. After passing the solution, silver ions contained in the fibre are reduced to a metal state with 0.02 M aqueous solution of a mixture of ascorbic acid with glucose in ratio of 1:9. Silver metal is then extracted by burning the silver-containing fibre in an air atmosphere at temperature of 450-500°C, followed by washing the formed silver reguli.

EFFECT: recovering silver ions from industrial waste water, improved method of extracting silver from process solutions used when producing textile materials with antimicrobial properties.

2 ex

FIELD: metallurgy.

SUBSTANCE: invention relates to hydrometallurgy of noble metals and can be used for silver extraction from alkaline cyanide solutions by cementation. Proposed method comprises cementation by aluminium as 0.1-2.0 mm thick chips. Cementation is carried out at specific solution feed rate of 1-4 m3/m2·h at concentration of sodium hydroxide of 1.0-10.0 g/l.

EFFECT: higher yield and quality.

3 tbl, 3 ex

FIELD: metallurgy.

SUBSTANCE: electronic waste is crushed on a hammer crusher; crushed copper is added, and then, it is fused in presence of flux during 45-60 minutes at the temperature of 1320-1350°C with air blowdown at its flow rate of 3-4.5 l/h and the obtained slag containing at least 2.6 wt % of precious metals is separated from slag.

EFFECT: effective electronic waste processing with increase of content of precious metals in an alloy.

1 ex

FIELD: metallurgy.

SUBSTANCE: invention relates to hydrometallurgy and can be used for processing of concentrates, industrial products and solid wastes containing metals. Proposed process comprises leaching of cake 3 n, by HCl solution at 70°C and L:S ratio of 2. Note here that leaching is performed in the presence of table salt of concentration making at least 120-140 g/dm3.

EFFECT: intensified leaching, higher yield.

4 tbl, 2 ex

FIELD: metallurgy.

SUBSTANCE: method to process an alloy of ligature gold, containing not more than 13% of silver and at least 85% of gold, includes electrolysis with soluble anodes from initial alloy with usage of hydrochloric acid solution of aurichlorohydric acid (HAuCl4) with excessive acidity by HCl 70-150 g/l as electrolyte. Electrolysis is carried out with deposition of pure gold on cathodes. At the same time into the initial electrolyte prior to start of the electrolysis process they introduce nitric acid to its concentration in electrolyte 70÷100 g/l. Then nitric acid is added in process of electrolysis into electrolyte in a dosing manner.

EFFECT: performance of gold refining per one stage with production of target product with high content of gold with reduced duration of process and lower energy and labour inputs.

3 cl

FIELD: nanotechnology.

SUBSTANCE: invention relates to the technology of production of gold nanoparticles. The method of production of gold nanoparticles from the raw material containing iron and non-ferrous metals comprises preparation of the chlorazotic acid solution of gold using chlorazotic acid. Then floatation extraction of gold precursors is carried out with cationic surfactants from the solution, separation and evaporation of the organic phase to concentrate the gold precursors. Then the concentrate reduction is carried out to obtain dispersion of gold nanoparticles. At that the starting material is first treated with hydrochloric acid to form the insoluble precipitate. Production of chlorazotic acid solution is carried out by dissolving in chlorazotic acid solution of insoluble precipitate. Before floatation extraction of precursors the nitric acid is removed from chlorazotic acid solution with methyl or ethyl alcohol or hydrochloric acid.

EFFECT: improvement of efficiency of the method of production of nanoparticles, namely the increase in the number of gold nanoparticles obtained or its hybrids with noble metals.

3 ex

FIELD: metallurgy.

SUBSTANCE: process can be used in hydrometallurgy for processing of gold-bearing two-fold hardness concentrates, that is, stock containing gold dispersed in sulphides and organic carbonaceous substance. Prior to feeding the concentrate acid pulp produced by pre-treatment of concentrate with acid into autoclave is cleaned of chlorides. Autoclave leaching is conducted at 225-235°C and terminated at reaching the pulp redox potential in the range of +700 - 730 mV relative to standard hydrogen electrode. For cleaning the pulp of chlorides at filter or at continuous return flow decantation hot condensate or natural water and/or desalinised water may be used. To maintain preset temperature at autoclave leaching cold fresh and/or reused water is fed to every section of autoclave.

EFFECT: higher gold yield.

4 cl, 7 dwg, 3 tbl, 2 ex

FIELD: process engineering.

SUBSTANCE: invention relates to cleaning of silver-bearing materials by hydrometallurgy processes, for example, scrap and wastes of microelectronics. Proposed method comprises dilution of silver-bearing material in nitric acid, addition of sodium nitrate to nitrate solution at mixing, extraction of silver salt precipitate and pits treatment to get metal silver. Note here that after addition of sodium nitrate the reaction mix is held for 1 hour to add sodium carbonate or bicarbonate to pulp pH of 8-10. Free silver salt precipitate as silver carbonate is separated from the solution by filtration. Sodium nitrite and carbonate or bicarbonate is added in the dry form. Note here that sodium nitrite is taken with 25% excess of stoichiometry.

EFFECT: higher purity and yield, simplified process.

2 cl, 2 ex

FIELD: process engineering.

SUBSTANCE: method comprises electrical treatment of minced material pulp in chloride solution and extraction of commercial metals. Both stages are executed in reactor using at least one membrane-free electrolytic cell. At electrical treatment, minced stock pump with S:L ratio equal to 1:(1-20) in chloride solution with chlorine concentration of 60-180 g/l to be acidified to pH 0.2-1.0. At electrical treatment initial stage, pump is mixed at current bulk density of 1000-10000 A/m3 at electrolytic cell permanent voltage of 2-5 V. Termination of pulp electrical treatment is fixed by transition over peak of time dependence of current magnitude and reach of pH 1-2.Treated pulp is fed to the stage of commercial metal extraction. For this cathode current density is set to 50-200 A/m3. Extraction is considered terminated at pH 3-7. Thereafter, cathode residues of both said stages are combined and directed for metal production by known processes.

EFFECT: incidental extraction directly in electrical chlorination of ore pulp.

11 cl 3 dwg, 1 tbl

FIELD: noble metal hydrometallurgy.

SUBSTANCE: invention relates to method for acid leaching of platinum method from secondary raw materials, in particular from ceramic support coated with platinum metal film. Target metals are leached with mixture of hydrochloric acid and alkali hypochlorite at mass ratio of OCl-/HCL = 0.22-0.25 and redox potential of 1350-1420 mV.

EFFECT: decreased leaching temperature, reduced cost, improved platinum metal yield.

2 ex

Up!