Method of recovering gold from gold ore concentrates

FIELD: gold mining.

SUBSTANCE: invention relates to selective recovery of gold from gravitation and flotation concentrates of gold-recovery fabrics in the stage of adjusting gold-containing products to condition meeting affinity requirements. Method of recovering gold from gold ore concentrates into lead melt comprises dispersing molten lead at vigorous blade agitator-mediated mechanic stirring in common with gold-containing concentrate in presence of molten alkali (NaOH) at concentrate-to-alkali weight ratio 1:(1-3) and temperature 400-550°C depending on mineralogical composition of concentrate.

EFFECT: accelerated recovery process and increased fullness of recovery.

2 cl, 4 ex

 

The invention relates to the metallurgy of noble metals and can be used for selective extraction of gold from gravity and flotation concentrates gold extraction plants in the development of gold-bearing products to the requirements of refining.

The method for extracting precious metals from gold gravity and flotation concentrates in the process of joint bottoms with copper sulfide concentrates on Stein and further processed matte to obtain blister copper metallurgy of noble metals. Malinetskii I.N., Chugaev L.V.: M, "metallurgy". - 1972. 368). The method is implemented by smelting with a flux at a temperature of 1350-1450°C. It provides the deepest recovery of precious metals in the copper matte and later in the blister copper (>99%).

The disadvantages of the method include the high temperature required for melting matte and blister copper, in concentrating the precious metals.

The method for extracting precious metals from gold concentrates in the conditions of the assay melting (950-1150°). Gold ore concentrate sitout with lead oxide, a reducing agent (coal, flour etc)and flux (soda, brown, silica) for slagging rock-forming and melt, for example, in crucible furnaces. In the melting process is recovered, the pig is from its oxide, presents the dispersed powder. The resulting recovery of fine lead-free provides the recovery of precious metals from the mixture. The extended surface of contact between the metal lead and ore material containing the metal include gold, allows you to realize how relatively quickly achieving deep recovery of noble metals in lead alloy (Probootborniki and analysis of noble metals. Baryshnikov IVAN, Popova N.N., Orobinskaya VA and other: M, metallurgy. - 1978. 432 C.). When the processing of oxidized and quartz ore concentrates, directly subjected to melting. In the case of sulfide and arsenic concentrates, smelting precedes operation oxidative roasting of the material with the purpose of deep removal of arsenic and sulfur in the form of gaseous compounds. The disadvantages of the method are:

- high temperature process;

- the necessity of preliminary roasting of sulfide and arsenic-pyritous gold concentrates.

The closest in technical essence to the invention is a method of extracting gold from gold ore concentrates lead alloy, including the smelting of lead together with gold concentrate in the presence of molten alkali (NaOH), and a temperature of from 380 to 500°depending on m is neurologicheskogo of the concentrate composition (patent RF 2104321 1998).

The technical result of the proposed invention is a deep extraction of gold from gold concentrates at high speeds the process.

The technical result is achieved by the method for extracting gold from gold ore concentrates lead alloy in the presence of molten alkali characterized by the dispersion of molten lead under intensive mechanical stirring his paddle stirrer together with gold-bearing concentrate in the presence of molten alkali (NaOH)at a temperature of 400-550°C. When the weight ratio of concentrate: alkali perform equal to 1:(1-3).

During combined operations full or partial decomposition of the gold-bearing minerals in the molten alkali and extraction of gold from the decomposition products of mineral forms, as well as free grains of the metal lead collector, characterized by a highly developed contact surface that is created when mechanical stirring of molten lead.

Collectormania noble metals by molten lead is, unlike the prototype, at a temperature of 400-550°and achieved high rates of extraction of gold (more than 99% regardless of the physical and mineral composition of the source of the gold ore concentrate).

In the melt of alkali is otlozhenii auriferous pyrite, pyrrhotite and arsenopyrite with the formation of alkali-soluble compounds. Processes occur at high speed and does not limit the extraction of gold in lead collector.

The weight ratio of concentrate: alkali (α), and the process temperature depends on the mineralogical composition of the concentrate and directly affect the viscosity of the slag melt.

In the processing of pyrite and arsenopyrite gravitational concentrates consumption of alkali increases - is the weight ratio α=1:(2,5÷3). For a number of mixed and quartz gravitational concentrates this ratio varies from 1:1 to 1:2. In all cases seek to obtain the viscosity of the alkaline afloat (5÷7)·10-2PA·C.

Example 1 (according to the known method, gravity gold concentrate composition, %: FeS2- 27,5; FeS - 4,8; Cu2S - 3,8; ZnS - 0,3; FeAsS - 27,6; - 5,8; SiO2- 23,3; Al2About3- 3,5 containing Au - 489 g/t and Ag - 1120 g/t, with a weight of 100 g is supplied to the firing in the hearth of the furnace at a temperature of 750°With periodic Peregrebnoe cinder. The duration of the firing 45 minutes the Calcine is cooled and sent to rihtovanie. The composition of the charge: PbO - 30 g; coal - 1.5 g; soda - 150 g; borax - 50 g; SiO2- 12,

After mixing with calcine the mixture was loaded into a crucible and placed in a chamber furnace. The melting temperature 1000°, prodoljitel the ness - 1 hour. The contents of the crucible was poured into the mold. After cooling, the slag is separated from a lead alloy. After Kopaliani alloy obtained gold-silver alloy, weighs 161 mg. After chemical treatment and atomic absorption determination found that the extract to lead gold and silver amounted to 99.9 and 99.7%, respectively.

Example 2 (present method). 50 kg of the original gravity concentrate (example 1) was zasitovani with 80 kg of dry NaOH. In a retort furnace downloaded 10 kg of lead and 70 kg of NaOH. The contents of the retort melted and the melt temperature was brought up to 550°C. turn on shuffle and downloaded the mixture containing gravity gold concentrate. The duration of mixing 40 minutes Defending 15 minutes by Opening valve poured lead alloy and in a separate mold slag. The slag was analyzed for content of gold and silver. The content of gold and silver amounted to 0.4 g/so

Analyzed lead alloy on the content of gold and silver. It was 5445 g/t gold and 845 g/t silver, which corresponds to the extraction of both metals at the level of 99.9%.

Example 3 (known). Gravity concentrate contains, %: SiO2- 60,5; Fe2O3- 15; Fe3About4- 13,4; Al2O3- 6,1; Au - 355 g/t; Ag - 783 g/so

Suspension concentrate 100 g was zacharovyvali with 25 g of PbO, 150 g of Na2CO3, 20 g b the market and 1 g of coal. The mixture was placed in a crucible and placed in a chamber furnace. The melting temperature 1000°C, duration - 1 hour. After the separation of slag and lead alloy, the latter was subjected to cupellation, chemical decomposition of gold-silver alloy with atomic absorption determination of gold and silver. In lead alloy extracted 99.6% of the gold and 99.5% silver.

Example 4 (the present method). 100 kg gravity concentrate (example 3) was zasitovani with 40 kg of NaOH.

In a retort furnace downloaded 25 kg of lead and 60 kg NaOH, melted and warmed melt up to 400°C. When the mixing in the retort filed a charge containing a gravity concentrate. The duration of the twisting system was 20 minutes After settling (15 min) from the retort were cast lead alloy and slag. Both products were analyzed on the content of noble metals:

Content, g/t
AuAg
Slag1,41,5
Lead alloy14173127
Removing the alloy, %99,7999,84

From these examples it follows that the claimed method provides a deep extraction of precious the metal of the gravity gold concentrates but when this process is carried out at low temperatures (400-550°C) and there is no need to pre-firing chalcogenide concentrates by the oxidation of sulfide sulfur and arsenic and their distillation.

1. The method for extracting gold from gold ore concentrates lead alloy in the presence of molten alkali characterized by the dispersion of molten lead under intensive mechanical stirring his paddle stirrer together with gold-bearing concentrate and molten alkali (NaOH) at a temperature of 400-550°C.

2. The method according to claim 1, wherein performing the weight ratio of concentrate: alkali equal to 1:(1÷3).



 

Same patents:

FIELD: secondary precious metal recovery.

SUBSTANCE: recovery of silver from waste, such as spent catalysts and ashes, us accomplished by charging waste into soda-borax melt taken in such proportions that weight of soda is by 2.0-3.5 times superior to that of oxide constituent of starting material and weight of borax constitutes 8-20% that of soda. Melting is effected at 1120-1350°C and melt is aged then for at least 15-20 min, after which products are separated and silver is recovered. Weight of charged waste (Pw) is found in dependence of content oxide constituent therein using formula (wt %): Pw = (11.5-16.7)MeO+(0.5-1.0)Na2B2O7+9SiO2 ( Me is Ca, Al, or 2Na).

EFFECT: achieved essentially complete recovery of silver.

1 tbl, 5 ex

FIELD: waste treatment.

SUBSTANCE: multicomponent waste material is preliminarily impregnated with solution of salt of metal-collector in amount ensuring weight content of metal-collector in melt exceeding content of metallic components therein. Material is then calcined and melted in reductive atmosphere after addition of slag-forming flux based on metal fluorides. Melt is stirred and kept in liquid state over a period of time long enough to allow separation of slag and metallic phases. Resulting slag and metal are tapped and mechanically separated when solidified.

EFFECT: achieved high degree of recovering metals in collecting alloy at minimum expenses.

8 cl

FIELD: noble metal metallurgy, in particular method for gold content determination in natural solid organic materials such as divot, state coal, brown coal, and black coal.

SUBSTANCE: claimed method includes sampling the probe of starting material, grinding, mixing with massicot, smelting to form bullion, parting of gold-silver globule, weighting of gold sinterskin. Probe is sampled from starting natural solid organic material. Before smelting mixture is packaged in lead foil, established in full-hot scorifying dish, and padded with borax and table salt.

EFFECT: precise method for gold content determination in natural solid organic materials.

1 tbl, 1 ex

The invention relates to pyrometallurgy, in particular to the recovery of precious metals from gravity concentrates

The invention relates to pyrometallurgy and can be used to implement the oxidative roasting of gold gravity and flotation concentrates containing significant amounts of sulphides of metals (up to 100%)

The invention relates to the field of analytical chemistry and can be used in the assay analysis for separating precious metals from lead

The invention relates to the field of metallurgy of noble metals, in particular to pyrometallurgical processing zinc precipitation containing precious metals

The invention relates to analytical chemistry and is designed to remove sulfur, arsenic, antimony, and other components, complicating the melting
The invention relates to the field of metallurgy, in particular the extraction of platinum group metals as secondary products of industrial production and of the platinum-bearing ores using processes blast furnace and Converter heats

FIELD: noble metal metallurgy, in particular method for gold content determination in natural solid organic materials such as divot, state coal, brown coal, and black coal.

SUBSTANCE: claimed method includes sampling the probe of starting material, grinding, mixing with massicot, smelting to form bullion, parting of gold-silver globule, weighting of gold sinterskin. Probe is sampled from starting natural solid organic material. Before smelting mixture is packaged in lead foil, established in full-hot scorifying dish, and padded with borax and table salt.

EFFECT: precise method for gold content determination in natural solid organic materials.

1 tbl, 1 ex

FIELD: waste treatment.

SUBSTANCE: multicomponent waste material is preliminarily impregnated with solution of salt of metal-collector in amount ensuring weight content of metal-collector in melt exceeding content of metallic components therein. Material is then calcined and melted in reductive atmosphere after addition of slag-forming flux based on metal fluorides. Melt is stirred and kept in liquid state over a period of time long enough to allow separation of slag and metallic phases. Resulting slag and metal are tapped and mechanically separated when solidified.

EFFECT: achieved high degree of recovering metals in collecting alloy at minimum expenses.

8 cl

FIELD: secondary precious metal recovery.

SUBSTANCE: recovery of silver from waste, such as spent catalysts and ashes, us accomplished by charging waste into soda-borax melt taken in such proportions that weight of soda is by 2.0-3.5 times superior to that of oxide constituent of starting material and weight of borax constitutes 8-20% that of soda. Melting is effected at 1120-1350°C and melt is aged then for at least 15-20 min, after which products are separated and silver is recovered. Weight of charged waste (Pw) is found in dependence of content oxide constituent therein using formula (wt %): Pw = (11.5-16.7)MeO+(0.5-1.0)Na2B2O7+9SiO2 ( Me is Ca, Al, or 2Na).

EFFECT: achieved essentially complete recovery of silver.

1 tbl, 5 ex

FIELD: gold mining.

SUBSTANCE: invention relates to selective recovery of gold from gravitation and flotation concentrates of gold-recovery fabrics in the stage of adjusting gold-containing products to condition meeting affinity requirements. Method of recovering gold from gold ore concentrates into lead melt comprises dispersing molten lead at vigorous blade agitator-mediated mechanic stirring in common with gold-containing concentrate in presence of molten alkali (NaOH) at concentrate-to-alkali weight ratio 1:(1-3) and temperature 400-550°C depending on mineralogical composition of concentrate.

EFFECT: accelerated recovery process and increased fullness of recovery.

2 cl, 4 ex

FIELD: noble metal metallurgy, namely separation of platinum group metals and gold from materials on base of non-noble metal chalcogenides.

SUBSTANCE: method comprises steps of treating material with nitric acid solution till oxidation-reduction potential 500-700 mV; extracting non-soluble residue; melting it at adding sodium-containing fluxes, carbon -containing reducing agent and copper- and(or) iron-containing industrial process product obtained at hydrolysis or cementation treatment of solutions of refining production; settling and cooling melt till its solidification. Solidified product is separated according to interface boundaries. Then separated bottom phase of heavy alloy is disintegrated to powder. Method allows to extract to target alloy up to 94% of platinum and palladium, more than 97% of rhodium, iridium and ruthenium. Disintegrated alloy may be processed as concentrate of refining production.

EFFECT: increased content of noble metal in bottom phase, lowered cost of next refining process.

2 cl, 1 ex

FIELD: metallurgy.

SUBSTANCE: proposed method includes reduction of silver chloride at heating and holding at heat in flow of gaseous hydrogen, bubbling of gas escaping from reaction chamber through water and obtaining aqueous solution HCl. Reduction is performed from silver chloride formed at refining of noble metals and ground to size of ≤100 mcm and located in reaction chamber at thickness of layer of ≤20 mm at temperature of 450°C±5°C by gaseous hydrogen heated to holding temperature.

EFFECT: increased degree of extraction of silver from silver chlorides.

1 tbl, 1 ex

FIELD: extraction of noble metals from materials containing such metals, for example sludge, used catalysts, ores.

SUBSTANCE: proposed method increases degree of extraction of noble metals into alloy at eutectic melting due to increased degree of extraction of micro-dispersed phases (nano-particles) and atoms of noble metals found in dislocations (linear defects) and micro-cracks of crystal lattices of initial materials. To this end, material from which noble metals are to be extracted is mixed with charge of alkaline composition and mixture is subjected to eutectic melting, thus obtaining alloy of these metals. Immediately before melting, mixture is subjected to mechanical activation continued for 0.0833-2 h at maintenance of ratio of delivered mechanical energy power to relative surface of mixture within 0.0133-25 W x kg x m-2. Eutectic melting of mixture is performed at temperature above 500°C. Ratio of mass of charge to mass of material is selected within 0.75-2; used as charge is mixture of sodium tetraborate with sodium carbonate, sodium tetraborate with sodium bicarbonate, sodium tetraborate and sodium carbonate and lead mono-oxide, sodium tetraborate with sodium bicarbonate and lead mono-oxide.

EFFECT: increased degree of extraction of noble metals.

4 cl, 12 ex

FIELD: nonferrous metallurgy; methods of detection of the noble metals in the mineral raw materials.

SUBSTANCE: the invention is pertaining to nonferrous metallurgy, in particular, to the methods of detection of the noble metals in the mineral raw materials. The technical result of the invention is an increased trustworthiness to the results of the testing crucible melt analysis. The method is conducted in the following way. From the material of the laboratory test sample take out the analytical part of the filler, mix it with the calculated amount of the charge and the mixture is smelt according to the standard method. During the smelt visually control the height of the boiling layer of the melt slag and lead. On completion of the smelt measure the mass of the slag and lead and calculate an admissible height of the boiling layer of the melt according to the following formula:0,9·Hm≥Hc≥[1,9/tg2α/2·(Mшш+Mcc)]1/3, whereHcr - depth of the crucible in meters(m);Hsl - the height of the boiling gas-slag layer, m; α - an angle at the apex of the cone of the inner surface of the crucible, in degrees;Msl, Mla - masses of the slag and mass of the lead alloy accordingly, kg;ρsl, ρla - density of the slag and density of the lead accordingly, kg/m3. If the visual estimation of the height of the boiling layer of the melt exceeds the limits of admissible values, them one may draw a conclusion about the low quality of the testing smelt, make corrections in the composition of the charge and repeat the test analysis.

EFFECT: the invention ensures an increased trustworthiness to the results of the testing crucible melt analysis.

3 ex

FIELD: noble metal metallurgy, in particular recovery of non-ferrous, noble metal and alloys thereof from debris of electronic devices and components.

SUBSTANCE: claimed method includes disintegration of radio-electronic debris, vibrating treatment with separation of heavy fraction containing noble metals, metal separation and recovery, wherein radio-electronic debris is sorted, and metal components are separated, remaining debris part is treated with separation of heavy fraction. Said fraction after separation is mixed with preliminary separated metal components and mixture is subjected to oxidative melting with feeding of air blowing in amount of 1.15-0.25 nm3 per 1 kg of mixture. Further obtained alloy is electrolitically refined in copper sulfate solution and noble metals are recovered from formed slurry. Method of present invention makes it possible to isolate 98.2 % of gold, 96.9 % of silver and 98.2 % of platinum.

EFFECT: method of increased noble metal yield.

2 dwg, 6 ex

FIELD: metallurgy of noble metals.

SUBSTANCE: proposed method includes selection of analytical weighted portions from ordinary samples of ore, analysis of weighted portions, forming and analysis of group sample before estimation of mass of weighted portion, estimation of mass of weighted portion, selection of weighted portion from sample at size of grain of 1-0.04 mm and final grinding of weighted portion to 0.2-0.04 mm. During analysis of weighted portions, approximate magnitude of content of gold Co.s. in ordinary samples is determined, group sample is formed from ordinary samples at minimum content of gold, analytical weighted portions are taken from group sample and content of gold Ci is determined, average content of gold in group sample Cg.s. is calculated, minimum mass of analytical weighted portion for group sample Mg.s.(g) is set at ratio Пi=2(Ci-Cg.s.)/(Ci+Cg.s.)≤Дg.s., where Пi is relative discrepancy between content of gold in i-analytical weighted portion and average content of gold in group sample; Дg.s. is permissible relative discrepancy between results of determination of content of gold in group sample during laboratory monitoring; then estimation of mass is performed for ordinary samples Mo.s. by the following formula: Mo.s.= (Mg.s.g.s./(Co.s.o.s.), where Дo.s. is permissible discrepancy between results of determination of content of gold in ordinary sample during laboratory monitoring.

EFFECT: enhanced rapidness and reliability; low cost of assay.

1 dwg, 2 tbl, 1 ex

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