Procedure for extraction of metals from silicate nickel ore

FIELD: metallurgy.

SUBSTANCE: procedure for extraction of metals from silicate nickel ore consists in preparation of silicate nickel ore by crushing and classification, in silicon leaching from ore with cultural medium of silicate bacteria and in successive extraction nickel from cake. Silicate minerals of ore are bio-degraded at leaching silicon with cultural medium of silicate bacteria; bio-degradation is performed at pH as high, as 4, without mixing and with replacement of cultural medium. Nickel is extracted from cake of bio-degradation by leaching with utilisation of solution of bio-degradation upon silicon has been extracted from it and by adding sulphuric acid to concentration 50÷450 g/l. Further, metal is extracted from leaching solution of cake bio-degradation.

EFFECT: increased extraction of nickel from silicate ore, raised rate and efficiency of silicate nickel ore leaching.

7 cl, 2 ex

 

The invention relates to metallurgy, in particular to the hydrometallurgical processing of silicate ores, waste dumps, industrial products, mostly of silicate Nickel ores (oxidized, laterite), and can be used for processing of silicates (bauxite, nepheline treatment and others), Muscovite, quartz ores and other

Silicate Nickel ores mostly poor, due to the uniform distribution of Nickel in minerals enriched traditional physico-chemical methods, so there is metallurgical processing of primary ore.

Used in industry methods of processing Nickel silicates and their profitability are determined by the content of Nickel, iron and magnesium in the ore.

Processing poor silicate Nickel ore Nickel content of 0.8-1.2% iron-magnesia type known methods unprofitable, because it is accompanied by a large consumption of reagents, capital and operating costs.

The heap leaching method pellets lateritic ore with an aqueous solution of sulfuric acid concentration of 50-100 g/l (US patent No. 6312500, publ. 06.11.2001) allows you to extract Nickel from silicates in solution, as well as iron and magnesium, forming a silicic acid. The main disadvantages of this method are the high consumption of sulfuric acid to magnesium ores, low and the attraction of Nickel, the complexity of the division of leaching solutions and silicified Chekov.

In another method of leaching Nickel and cobalt from silicate Nickel-cobalt ores (patent RU №2006115189, publ. 20.11.2007) leaching heap is the way the solutions of mineral acids concentration corresponding to a pH value of 2.5 to 4.0, Eh not below 450 mV, with the return and consolidation of leaching solutions and extraction of metals from the pregnant solution leaching. The disadvantages of this method is the long duration of processing due to a lack of high concentration acid solution leaching, high consumption of acid leaching of the ore-iron-magnesia type, not a high Nickel recovery due to the inability of the acid extraction of metals in closed silicates, the complexity of the extraction of metals from solutions due to the formation by leaching with a mineral acid gel of silicic acid.

In the method of extraction of Nickel from lateritic ores (patent RU №2178467, publ. 20.01.2002), Nickel leached from the ore with an aqueous solution obtained using heterotrophic microorganisms with a pH of 1-3. The method is used filamentous fungi Aspergillus niger, Penicillium Sp., Aspergillus Sp., Penicillium Simplicissimus and bacteria Enterobacter Spp., Bacillus Spp. and Achromobacter Spp., which synthesize organic carboxylic acid is, leaching of metals from silicates in solution with the formation of complex compounds and chelates. Leaching is performed in a single step extraction in a solution of Nickel, iron and magnesium. Leaching of metals from the silicate Nickel ores acids by heterotrophic microorganisms offered in a different way (US patent No. 6395061, publ. 28.05.2002).

The main advantage of the methods of leaching of metals from ores using microorganisms is an exception to the procurement, transportation and storage of acid as it is produced by microorganisms.

The disadvantages of this method is the high cost of organic carbohydrate food for education microorganisms acid to pH values from 1 to 3, the lack of growth and reproduction of heterotrophic microorganisms of these cultures at low pH, low Nickel recovery - no more than 38% for 32 days due to the use of weak organic acids, unavailable for acid Nickel closed siloxane (siloxane) bonds Si-O in layered silicates.

There is a method of beneficiation of bauxite - enhancing silicon module for the production of alumina by treatment with a solution of heterotrophic microorganisms, in particular silicate bacteria (Pol'kin, S., Adams EV, V.V. Panin Technology bacterial leaching of non-ferrous and rare metals. - is.: The subsoil. 1982. - s-260). Leaching of silica from bauxite silicate bacteria in the solution passes aluminium, which is difficult to remove from the silicon solutions.

The closest in technical essence to the claimed method is a method of processing silicate Nickel ores (patent RU №2111058, publ. 20.05.1998 year), including crushing, screening, pokuskovoi nuclear sorting ore divided into six products, crushing concentrates, intermediate products of size more than 15 mm to a particle size of 1.0-0.14 mm and a heap of bacterial-chemical leaching of these silica processing of silicate bacteria group Silucius depending on the size of the product different number of times for 3-4 days at pH 5.0-5.5, the extraction of Nickel and cobalt from Chekov leaching of ore.

The disadvantage of this method is the high cost and low profitability of extraction of metals from poor iron-magnesium silicate Nickel ores, insufficient mode decomposition of silicate minerals in the implementation of the leaching of silicon silicate bacteria and, accordingly, the opening of the metals and the extraction of metals from Chekov bacterial leaching.

The technical result achieved by the present invention is to improve the profitability of refining and improving to extract the deposits of metal from silicate Nickel ores.

This technical result is achieved by the method of extraction of metals from the silicate Nickel ores, including todopoderoso silicate Nickel ore crushing, classification and sorting, degradation of silicate minerals ores cultural environment silicate bacteria at pH 4.0, without stirring and with the change of culture medium, the extraction of Nickel from cake biodegradation leaching using a solution of biodegradation after taking out the silicon and adding sulfuric acid to a concentration of 50-450 g/l, the extraction of metals from solution leaching cake of biodegradation.

Special cases of the invention are characterized by the fact that the ore preparation involves grinding the ore to a particle size of 5÷25 mm, classification, sorting pieces of ore Nickel content of x-ray radiometric or photometric method.

Preferably, the biodegradation of silicate minerals of the ore to make the cultural environment of silicate bacteria Bacillus muciloginosus.

Also the cultural environment of silicate bacteria is prepared using as components of food salts of nitrogen, potassium, phosphorus, calcium, zinc, magnesium and organic carbohydrates, and carbohydrates as organic food for the bacteria use waste sugar or alcohol production, in particular beckons pulp./p>

In addition, the decomposition of silicate minerals ores cultural environment silicate bacteria and subsequent leaching of metals from the cake of biodegradation is a compact way.

Also the decomposition of silicate minerals silicate ore bacteria is repeated with fresh medium cultivation with bacteria.

The main Nickel-containing minerals in silicate Nickel ores are serpentines (serpentinites) and chlorites, Nickel in the form of impurities may be in the vermiculite. Metals in silicate Nickel ores are found in the structure of the crystal lattice of silicate minerals, forming communication Me-O-Si.

In serpentine structure of the Me-O-Si metals are open and can interact directly with acids released link-O-Si interact with hydrogen ions with the formation of silicic acid.

Chlorite and vermiculite have a layered type of structure Si-O-Me-O-Si, metals blocked between the tetrahedral layers siloxane relations, i.e. metals closed for interaction.

In the interaction of silicates E. acids without holding beadstyle metals leach from open silicates as serpentines, silicates partially dissolved with the formation of silicic acid, is okremnennye cake. By acid leaching proceeds rebuilding the structure of the URS silicates, the metal content in silicates decreases, silicon is increased.

In the leaching of inorganic and organic acids incomplete extraction of Nickel silicates due to the presence of Nickel minerals in the layers of which the octahedral layer of the IU-O blocked two tetrahedral layers of Si-O. For the extraction of Nickel from such silicate minerals necessary to destroy siloxane connection Si-O tetrahedral layer for opening the octahedral layers before acid leaching.

Action filamentous fungi Aspergillus niger on Nickel silicate minerals is the destruction of communications Si-O and Me-O in the silicate by enzymes produced by microorganisms and carboxylic acids using silicon for the structure of cells.

Silicate bacteria in the interaction with silicate minerals tear siloxane connection of Si-O in the crystal lattice enzymes of the cell (enzymes). In the process of biodegradation silicate leaching of metals does not occur, as they produce a weak organic acid in the activity of bacteria, which are unable to form stable compounds with metals, formed by the organic acid is spent on interaction with kislotosoderjasimi ore minerals. The result is the destruction of the crystal resh the TCI silicates with the transition of silicon in the solution, solid phase enriched with metals - Nickel, iron, magnesium, Me-O opened and made available for leaching acids.

Enzymatic destruction of nature siloxane bonds in silicates involves direct contact of bacteria with the ore. Silicate bacteria smooth, do not have flagella, so I can not gain a foothold on the surface of the ore under stirring, consequently, destruction of silicates occurs only in the mode without stirring.

Fresh culture medium for silicate bacteria has a pH of 6.5 to 7.0 by adding 10-20% inoculum pH is reduced to pH 5.5 to 6.0. When culturing bacteria on carbohydrate nutrition and the interaction of bacteria with silicates are formed carboxylic acid, the pH value is reduced to 4.0. At lower pH the activity of silicate bacteria inhibited, activity, growth and reproduction slows down and stops. Silicate bacteria destroy siloxane communication silicates enzymes located in the cell wall is mainly silicate. The decrease in the concentration of bacteria and their activity at low pH leads to a decrease in the number of destructible siloxane relations and opening of metals for subsequent leaching.

Maintaining the activity of the bacteria and the efficiency of destruction of their silicate mineral is in the ore is carried out multiple feeding of fresh medium cultivation with bacteria, as nutrients for growth and reproduction of bacteria during prolonged action are depleted, increases the production of carbonic acid and lowers the pH value, which inhibit bacteria.

Solutions of biodegradation of silicate minerals cultural environment silicate bacteria contain silicon and carboxylic acids, and small amounts of metals. Use for metal leaching from a cake of biodegradation after removing the silicon allows to reduce the consumption of acid for leaching of metals, to avoid losses recoverable metals under the action of organic acids produced by silicate bacteria.

Removing silicon from solutions of biodegradation reduces the formation of silicic acid by acid leaching, forming gels and having absorptive properties. Removing the silicon can improve the filterability Chekov leaching and to simplify the extraction of metals from solutions of acid leaching.

Extraction of metals from cake biodegradation of silicate Nickel ore increases with the concentration of sulfuric acid is not less than 50 g/L. lowering the concentration of sulfuric acid of less than 50 g/l speed of extraction of Nickel is reduced. Increasing acid concentration of more than 450 g/l leads to unproductive its consumption, thus removing the Nickel surface which agrees slightly. When the concentration of sulfuric acid of more than 450 g/l is a silicate sintering ore and reducing the rate of leaching.

Nickel silicate minerals serpentines (coils) and chlorite are green, the name of the chlorite is derived from the Greek "chloros" green for color. The Nickel content in serpentine of 3.3%, chlorite 1,17-of 2.16%. In addition, serpentine and chlorite contains the bulk of the Nickel compounds, such as revisit, garnierite, millerite, etc. by impregnation of Nickel silicates in the ore -5÷-25 mm sorting ore Nickel content carried out by crushing the ore to the same size. The selection of pieces of ore, Nickel silicates and contains more Nickel can be x-ray radiometric method or by a photometric method.

Cultivation of silicate bacteria is added to the solution of the nutrient medium 10÷20% inoculum containing bacteria and metabolic products. Nutrient medium containing necessary for vital minerals salts of nitrogen, potassium, phosphorus, calcium, magnesium and organic carbohydrates. Wednesday Ashby, used for the cultivation of Bacillus mucilaginosus, contains in 1 liter of water 0.2 g2NRA4, 0.2 g MgSO4·H2O, 0.2 g NaCl, 0.1 g K2SO4, 5.0 g of caso3, 0.005 g of Na2MoO4, 20 g of molasses. When 10% of insulinopenia the donkey 2-4 days of cultivation the growth of bacteria enters a phase of accelerated growth the lag-phase, the bacteria are actively growing and interact with silicates.

Silicate bacteria are heterotrophs, which are used as carbon source for the structure of the cells of organic carbohydrates, such as glucose, maltose, and sugar. Cheaper carbohydrate food bacteria are wastes of sugar or alcohol production, in particular beckons pulp.

Heap is the cheapest on the capital and operating costs, its use for the poor silicate ore more cost-effective. Heap method can be used for the preparation of silicate bacteria and subsequent leaching of metals from ores with sulfuric acid.

Increasing the efficiency of processing and the increase in the extraction of Nickel from Nickel silicate ores is achieved by the effective opening of metals in silicate minerals that occur in the established mode of biodegradation of silicate bacteria, the use of a solution containing biodegradable organic acids and metals after extraction of silicon.

For the extraction of Nickel and cobalt from leaching solutions Keck biodegradation it is advisable to extract the iron present in the solution as divalent and trivalent, as in the extraction of Nickel iron will contaminate the Nickel is already installed. To extract iron from the solution first oxidize the divalent iron to trivalent forms, such as hydrogen peroxide or ozone, with a pH value of more than 1.7 to 2.0 ferric iron precipitates, it precipitated or filtered. Adding into the solution sulfidization, for example of hydrogen sulfide, allows you to select a product containing sulfides of Nickel and cobalt.

Extraction of Nickel from solution can be selective for Nickel and cobalt liquid organic extractant, such as LIX, and subsequent electrolysis to produce pure Nickel or using ion-exchange resins.

The invention is illustrated by examples of implementation of the method.

Example 1

Silicate Nickel ore ferro-magnesian type with a content of 1.2% Ni, 48% SiO2, 12% Fe2O325% of MgO crushed to a particle size of 15 mm, was obesshlamlivanija with the selection of classes 15+1.0 mm and 1.0 mm Slurries were activelist using sulfuric acid. Ore and pellets piled on an impermeable base. Silicate minerals in the ore and pellets were destructibles interaction with the cultural environment of silicate bacteria Bacillus muciloginosus prepared by cultivation on a nutrient medium Ashby salt containing nitrogen, potassium, phosphorus, calcium, zinc, magnesium, and using pulp - waste of sugar is about production. The biodegradation of silicate minerals of the ore was carried out in heaps without mixing and aeration, with the change of culture medium on fresh at lower values of pH to 4.0, the change of the culture medium was carried out 5 times. Leaching of metals from the cake of biodegradation was carried out with a solution of biodegradation after taking out the silicon and adding sulfuric acid to a concentration of 200 g/l Solution after leaching cake biodegradation returned to the irrigation of the heap before reaching the Nickel concentration in the solution is not less than 1-2 g/l At lower acid concentration in the leaching solution is less than 50 g/l was made her add.

The extraction of Nickel from the ore into solution was 91%, the Nickel concentration in the solution 6,98 g/l of iron in a solution of 37 g/l Leaching the ore with sulfuric acid without the destruction of the US patent No. 6312500 allows you to extract no more than 86% Nickel with a higher consumption of acid. The solution after acid leaching cake of biodegradation was OSVETLENIE, the iron in the solution was oxidized and deposited metals were extracted by the method of solvent extraction selective extractants with subsequent electroextraction.

Example 2

Silicate Nickel ore ferro-magnesian type with a content of 0.9% Ni, 46% SiO2, 23.6% of Fe2About3, 14% MgO, in which the main ore minerals are serpentine 35.5 per cent, is ALK 16,0%, chlorite 12.7 percent crushed to a particle size of 25 mm, were classificatie emitting fractions of classes 25+5 mm 5 mm ± 1.0 mm, 1,0+0 mm From the fraction of the ore 25+5 mm were sorted photometric way, stood out pieces of green with a Nickel content of 3.8%, pieces of black and white with a Nickel content less than 0.4% and the fraction of pieces of red and yellow flowers with a content of 0.6% Nickel consisting mainly of hematite and ochre minerals.

Silicate minerals pieces of ore green, containing Nickel in magnesium and iron-magnesium silicates, were subjected to biodegradation heap way cultural environment silicate bacteria Silicius cooked on a nutrient medium Ashby salt containing nitrogen, potassium, phosphorus, calcium, zinc, magnesium, and using as the organic carbohydrate food Manita. The biodegradation was carried out with repeated change of culture medium by reducing the pH to 4.0. From the solution of biodegradation were extracted from the silica by the addition of sulfuric acid to the acid concentration of 50 g/l and filtering the precipitate. After removing the silicon to the solution was added sulfuric acid to a concentration of 80 g/l and fed to the leaching of metals from Chekov biodegradation together with pieces of red and yellow flowers, faction -5+1.0 mm and pelletised sludge fraction -1,0+0 mm-hosted Moskovchenko and yellow colors in the lower layer of the heap. The leaching solution was returned to the irrigation of the heap to achieve the desired concentration of metals to conduct extraction, lowering the concentration of sulfuric acid in the leaching solution is less than 50 g/l was added acid.

The extraction of Nickel from the ore amounted to 89.5%, the Nickel concentration in the solution of 2.25 g/l of iron in the solution of 18.5 g/l Solution after leaching was OSVETLENIE, the contained iron is oxidized and precipitated, and then was held sulfidization metals sulfur sodium obtaining a precipitate of Nickel sulfide and cobalt sulfide containing 50-55% Nickel.

1. The method of extraction of metals from the silicate Nickel ores, including todopoderoso silicate Nickel ore crushing, classification and sorting, leaching from ore silicon cultural environment silicate bacteria and subsequent extraction of Nickel from oxide, characterized in that cultural environment silicate bacteria carry out biodegradation of silicate minerals ore at pH below 4 without stirring and with the change of culture medium, the extraction of Nickel from oxide of biodegradation is carried out by leaching with the use of a solution of biodegradation after taking out the silicon and adding sulfuric acid to a concentration of 50÷450 g/l, the extraction of metals from solution leaching cake of biodestruction.

2. Ways who according to claim 1, characterized in that the ore preparation involves grinding the ore to a particle size of 5÷25 mm, classification, sorting pieces of ore Nickel content of x-ray radiometric or photometric method.

3. The method according to claim 1, characterized in that the biodegradation of silicate minerals ores carry silicate bacteria Bacillus muciloginosus.

4. The method according to claim 1, characterized in that the culture medium of silicate bacteria is prepared using as components of food bacteria salts of nitrogen, potassium, phosphorus, calcium, zinc, magnesium and organic carbohydrates.

5. The method according to claim 4, characterized in that the organic carbohydrates to feed the bacteria use waste sugar or alcohol production, in particular beckons pulp.

6. The method according to claim 1, characterized in that the biodegradation of silicate minerals ores cultural environment silicate bacteria and subsequent leaching of Nickel from KEK biodegradation perform heap method.

7. The method according to claim 1, characterized in that the biodegradation of silicate minerals silicate ore bacteria carry out repeated supply of fresh culture medium with bacteria.



 

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1 tbl, 2 ex

FIELD: metallurgy.

SUBSTANCE: procedure for processing mixed copper ore consists in ore crushing and crumbling. Further, crumbled ore is leached with solution of sulphuric acid of concentration 10-40 g/dm3 and mixed during 10-60 min at contents of solid phase 10-70 %. Upon leaching cake of ore leaching is dehydrated and flushed. Further, flush water is added to a liquid phase of ore leaching and solid suspensions are released from joined copper containing solution. Copper is extracted from copper containing solution and there is produced cathode copper. Flotation of copper minerals from leaching cake is performed at value of pH 2.0-6.0 and there is produced flotation concentrate.

EFFECT: raised extraction of copper into commodity products, reduced consumption of reagents for flotation, increased rate of flotation, and reduced expenditures for crumbling.

8 cl, 1 dwg, 2 ex

FIELD: metallurgy.

SUBSTANCE: procedure for processing sulphide mineral products using bacteria for extraction of metals consists in vat leaching crumbled sulphide mineral products in not less, than two serially connected vats and in mixing with solution of sulphuric acid at value of pH below 1.8, contents of solid phase 10-60%, concentration of ions of trivalent iron over 3 g/l, and temperature 50-99°C. Pulp is withdrawn from the last vat, is divided into solid and liquid phases and solid phase is returned to leaching into the first vat. Bacterial oxidation of iron in a liquid phase is performed in a separate reactor at value of pH 1.4-2.2, and temperature to 90°C with aeration and with addition of elements for bacteria feeding. Upon iron oxidation liquid phase is returned to the leaching vats. Metals are extracted from leaching phases.

EFFECT: increased extraction of metals and rate of process.

11 cl, 1 dwg, 2 ex

FIELD: metallurgy.

SUBSTANCE: procedure for extracting metals of platinum group consists in sulphatisation of source raw stock using oxidant and in successive water leaching. As source raw stock there are used chromites. Chromites are sulphidised at liquid: solid ratio =4:1-6:1 in water solution of sulphuric acid with concentration 85-93 % wt at temperature 150-170°C. As oxidant there is used chromium oxide CrO3 taken at amount of 70-80 % wt of iron contents in chromite.

EFFECT: raised complexity of raw stock utilisation and increased extraction of platinum metals.

1 tbl, 5 ex

FIELD: metallurgy.

SUBSTANCE: procedure consists in processing wastes with sulphuric acid at raised temperature, in supplying hydrogen peroxide, in introducing rhenium, nickel and cobalt into leaching solution and in concentrating tungsten, niobium and tantalum in insoluble residue. Further, solution is separated from insoluble residue; extraction of rhenium from solution is leached with secondary aliphatic alcohol. Extract is washed and rhenium is re-extracted with leaching solution upon extraction. Hydrogen peroxide is supplied after main part of nickel and cobalt have passed into solution at maintaining redox potential in interval of 0.50-0.75 V relative to a saturated chlorine-silver electrode, while extraction of rhenium, extract washing and rhenium re-extraction are carried out on 2-5 steps.

EFFECT: increased extraction of rhenium at reduced consumption of oxidant, increased safety of procedure due to separated in time operations followed with release of hydrogen and oxygen.

6 cl, 4 ex

FIELD: metallurgy.

SUBSTANCE: procedure for extraction of nickel from solutions and purification from impurities: Cr3+, Fe3+, Al3+, Cu2+, Zn2+, Co2+, Fe2+, Mn2+, Ca2+, Mg2+ consists in bringing pH of solutions to values 4.0-6.5, in sorption of nickel at pH=4.0-6.5 from solutions or pulps on sub-acid cationites, in desorption of nickel from saturated cationites with solution of sulphuric or hydrochloric acid with production of solution of nickel strippant. Before desorption saturated cationite is treated with solution of nickel purified from impurities, also with portion of solution of strippant with concentration of nickel higher, than its concentration in source solution or pulp coming to sorption at a value of pH less, than pH of solution or pulp in the process of sorption. Ratio of CNI:ΣCimpurity in solution of strippant changes from 7:1 to 500:1.

EFFECT: more deep purification of solution of nickel strippant from impurities.

4 tbl

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