CN102051491A - Method for concentrating gold from pyrite inclusion-type gold ore - Google Patents
Method for concentrating gold from pyrite inclusion-type gold ore Download PDFInfo
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- CN102051491A CN102051491A CN 201010550872 CN201010550872A CN102051491A CN 102051491 A CN102051491 A CN 102051491A CN 201010550872 CN201010550872 CN 201010550872 CN 201010550872 A CN201010550872 A CN 201010550872A CN 102051491 A CN102051491 A CN 102051491A
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Abstract
The invention relates to a method for concentrating gold from pyrite inclusion-type gold ore. The pyrite inclusion-type gold ore is gold-containing sulfur ore with high recovery value. The roasted ore of pyrite inclusion-type gold ore is used as raw material and proportionally mixed with charred coal, lime and quartz; and the resulting mixture is fed into a smelting furnace and undergoes the reduction smelting at a temperature ranging from 1450 DEG C to 1600 DEG C, so as to produce gold-rich pig iron. The gold-rich pig iron as an anode plate is electrolyzed by the diaphragm electrolysis technique in an electrolysis system containing ferrous sulfate or ammonium sulfate aqueous solution, so as to produce electrolytic iron and gold-rich anode mud. The method increases the resource utilization rate and is environment-friendly.
Description
Technical field
The present invention relates to the production method of metal, and relate to pre-treatment and sinter process process raw material.
Background technology
Pyrite coated gold mine (comprising that gold utensil has containing of recovery value of golden sulphur concentrate) belongs to difficult-treating gold mine, and wherein, iron mineral is mainly pyrite (FeS
2) and arsenopyrite (mispickel, FeAsS
2), the occurrence status of gold mainly contains two kinds: the one, and by mineral such as pyrite, arsenopyrite parcel, this is the topmost embedding cloth of a gold mineral form with the microfine form, its granularity does not wait from submicron to tens of microns; Second kind of fine crack and crystal grain gap distribution that is gold mineral along pyrite, arsenopyrite, this also is the main embedding cloth form of gold mineral, this gold mineral granularity is also between submicron is to tens of microns.The common trait of these two kinds of occurrence status of gold is closely wrapped up with micro-golden form for it.
When Wet-process metallurgy methods such as adopting cyaniding extracts gold from pyrite coated gold mine and since leaching agent be difficult to be transported to the gold mineral particle surface be in contact with it take place should, cause the leaching yield of gold very low, can not realize golden economy, high efficiency extraction.Therefore,, at first must adopt chemical process, pyrite and arsenopyrite are decomposed, be converted into loose porous ferriferous oxide or oxyhydroxide, carry gold with Wet-process metallurgy methods such as cyanidings again in order from pyrite coated gold mine, to extract gold.Decompose the process of pyrite and arsenopyrite, generally be referred to as the pre-treatment of pyrite coated gold mine.
The pretreatment process of pyrite coated gold mine, mainly contain following several: a kind of is roasting, adopt equipment such as fluidizing reactor, hearth-type furnace or rotary kiln, under the condition of controlled atmosphere, temperature and time, by one section or two-stage roasting, make sulphur, arsenic in the ore be removed output high-arsenic dust and SO
2Flue gas, recycling respectively.High-arsenic dust generally further is processed as white arsenic product; The pyrite coated gold mine high to sulfur-bearing, SO
2Flue gas can be used for relieving haperacidity; And to low-sulfur pyrite coated gold mine, because flue gas SO
2Concentration is lower, then will adopt absorption process to handle, and production cost is higher.In roasting, pyrite and arsenopyrite mainly are converted into rhombohedral iron ore, and its amount accounts for 95%～98%.Also have on a small quantity and exist with forms such as magnetite, ferric metasilicate, iron sulphide, ferric sulfate.The roasting pretreatment technology can be realized the comprehensive utilization of resources such as sulphur, arsenic, gold, but owing to easily form the secondary parcel of gold in the roasting, under a lot of situations, the cyaniding rate of gold is on the low side, in addition, cyanidation tailings does not utilize at present, stores up and causes land resources waste and environmental pollution.
Second kind of pretreatment technology is the wet chemical oxidation method, can be further divided into pressure oxidation, bacterial oxidation and chemical oxidation etc.
Pressure oxidation leaching-out method is a kind of deep oxidation method.As far back as nineteen fifty for mid-term, Canadian CNCCC just once presses under the 2250kPa condition at 232 ℃ of temperature, oxygen, leaches the ore that contains golden 59g/t, contains arsenic 16.7%, makes gold leaching rate bring up to 97% by 80%, the prussiate unit consumption reduces 75%～95%.U.S. Huo Musite company earlier through the pre-treatment of pressure oxidation method, adopts cyaniding and carbon slurry Fa Tijin at the Maclaurin concentrate of markon's welfare Asia then.This gold mine was gone into operation in 1985, day processing raw ore 2700t, 160,000 ounces of year pans.Process institute of China Chinese Academy of Sciences adopts the pressurised oxygen choline to soak pre-treatment to stockaded village, northeast, Sichuan Province gold mine, and gold leaching rate is increased to 85% by 35%.Guangdong non-ferrous metal research institute adopts pressure oxidation treatment to lotus flower mountain flower mountain, Guangdong tungsten ore arsenic cobalt mine tailing (contain As 20.20%, Co 0.96%, Au 6g/t), and gold leaching rate can reach 81.7%.A kind of improvement of pressure oxidation method for add nitric acid (or nitrate, nitrite etc.) in leach liquor, utilizes NO
xIn the effect of the alternate transmission oxygen of gas-liquid, improve oxidizing reaction rate, make the hyperbaric oxygen process of soaking under lower temperature and pressure, to carry out.Hyperbaric oxygen soaks the preconditioning technique maturation, and is effective, and arsenic is converted into stable ferric arsenate precipitation in the leaching, sulphur is converted into sulfate radical, has eliminated the pollution to environment of arsenic, sulphur, but equipment requirements height, investment are big, can not fully utilize iron, sulphur resource in the auriferous pyrite concentrate, be its deficiency.
The bacterial oxidation lixiviation process is with Thiobacillus Ferrooxidans'Oxidation pyrite, arsenopyrite, is translated into sulfuric acid, vitriol and arsenate, leaches gold with conventional cyanide process then.USSR (Union of Soviet Socialist Republics) has promptly been carried out this Study on Technology in generation nineteen sixty, the gold floatation concentrate PREPROCESSING OF A REFRACTORY GOLD factory of 10t/d has been set up in Faivrew ore deposit, South Africa in 1986, after this, in states such as Zimbabwe, the U.S., Australia, Canada, also set up similar pilot-plant test factory.The process unit of grade of China academy of sciences also at the processing of ground high-Arsen gold ores such as Guangxi, Xinjiang, Jiangxi, Hebei, has carried out experimental study work, obtains better effects.Bacterium lixiviation process cost is low, but slow, the consuming time length of speed of response, arsenic can not be converted into stable ferric arsenate in the leaching, and its behavior reaches the potential impact to environment, waits further research.In addition, bacterium is leached the comprehensive utilization that can not realize iron in ore, sulphur resource.
Chemical oxidation is to adopt strong oxidizers such as hydrogen peroxide, nitric acid, realizes the oxidation of arsenopyrite concentrate, thereby improves a class technology of golden cyaniding rate, because the oxidant consumption amount is big, the cost height is failed wide popularization and application.
Though wet process oxidation technology can be realized high gold recovery, sulphur, arsenic and iron resources all do not utilize, and the volume of cargo in storage and the wastewater discharge of slag are big, cause the wasting of resources and environmental pollution.
Summary of the invention
The objective of the invention is, at the resource that the existing treatment process of pyrite coated gold mine (comprising that gold utensil has containing of recovery value of golden sulphur concentrate) exists fail to make full use of, the quantity of slag is big and poor stability, deficiency such as wastewater discharge is big, gold recovery is on the low side, proposing a kind of is raw material enrichment gold with pyrite coated gold mine, the method that is beneficial to reclaim.
Its scheme is carried out pre-treatment at first adopting roasting to pyrite coated gold mine, and the sulphur and the arsenic that remove are wherein recycled; Roasted ore with output is a raw material again, adds coke or coke powder, allocates flux such as lime, quartz sand into, carries out retailoring, and iron is reduced to the pig iron in the melting, and gold is enriched in the pig iron; Then, adopt electrolysis process to handle, gold further is enriched in the anode sludge, and iron is separated out at negative electrode and is electrolysis pure iron product the golden pig iron of richness.
The retailoring temperature is 1450～1600 ℃, the proportioning of coke, the amount that is reduced to metallic iron by the iron that is not less than 50% adds, and the amount of allocating into of lime, quartz sand adds by the slag type, proportioning is roasted ore: coke: lime: the mass ratio of quartz sand=10: 2～5: 4～0: 0～3; The golden iron founding of richness is become anode block, carry out electrolysis in the band diaphragm sell, electrolyte body is FeCl
2With NH
4The Cl aqueous solution, FeCl
2Concentration is at 50～200g/L, NH
4Cl concentration is at 50～200g/L, and current density is controlled at 50～400A/m
2, electrolyte temperature is controlled at 20～60 ℃; Or electrolyte body is FeSO
4With (NH
4) 2SO
4The aqueous solution, FeSO
4Concentration is 20～250g/L, (NH
4)
2SO
4Concentration is at 50～200g/L, and current density is controlled at 50～500A/m
2, electrolyte temperature is controlled at 20～70 ℃.
The advantage of the inventive method is, resource comprehensive recovery utilization rate height is pollution-free, the gold recovery height, smelting slag stability is high, but long-term safety store up, also can be used as building materials prepared usings such as cement.
Description of drawings
Accompanying drawing 1 is a principle flow chart of the present invention.
Embodiment
Below the technical scheme of being invented is described in detail.
As shown in Figure 1, the ore that the present invention relates to is pyrite coated gold mine (comprising that gold utensil has containing of recovery value of golden sulphur concentrate), it is characterized by gold and is micro-golden form and is wrapped up by pyrite, arsenopyrite; This raw material contains the gold fluctuation at 2～200g/t, sulfur-bearing 20～50%, and iron content 20～45% contains arsenic usually, and its amount fluctuation is 1～25%; After raw material generally is the raw ore exploitation, adopt the flotation process separation and concentration to obtain, so its granularity can directly add stoving oven and carry out the roasting pre-treatment about 325 orders.Pretreated sulphur, the arsenic that removes in the pyrite coated gold mine that act as of roasting, output contain gold burning slag (roasted ore) and are used for retailoring.Roasting can be adopted equipment such as fluidizing reactor (comprising circulating roaster), hearth-type furnace, rotary kiln.Maturing temperature is 500～800 ℃, and generally at 750 ℃, roasting time is 1～4h, is generally about 2h, according to the ore characteristics, can adopt one section or two-stage roasting.The sulphur and the arsenic that remove in the roasting reclaim from flue gas, can produce sulfuric acid and white arsenic product respectively.The roasted ore of output, iron content are mainly rhombohedral iron ore 20～55%, also have a small amount of magnetite, ferric metasilicate, iron sulphide and ferric sulfate to exist; Sulfur-bearing contains arsenic 0.1～2% 0.1～2%, also contains impurity element and SiO such as copper, lead, zinc
2, Al
2O
3, gangue contents such as CaO, MgO; Roasted ore contains gold at 2～250g/t.In the roasting, answer control condition, sulphur and arsenic are removed fully.The following chemical ingredients of classifying a kind of pyrite coated gold mine roasted ore as: Fe 60.22%, and Pb 0.78%, and Zn 0.77%, and S 0.25%, and As 0.063%, and Cu 0.061%, and P 0.029%, SiO
29.38%, Al
2O
31.33%, MgO 0.094%, and CaO 1.14, Au8.28g/t.
Roasted ore and coke, lime and quartz sand are by carrying out retailoring in the proportioning adding smelting furnace, and smelting furnace can adopt iron-smelting blast furnace, interchange or direct current electric arc furnace, reach all kinds of bath smelting furnaces, and is comparatively suitable with interchange or direct current electric arc furnace.If adopt blast furnace, then at first tackle roasted ore and carry out sintering or pelletizing, and use block coke.Because when the reduction ratio of iron reaches 50%, the accumulation rate of gold can reach more than 85%, so in preparing burden, the amount of allocating into of coke makes the reduction ratio of iron be not less than 50% and gets final product; The amount of lime, quartz sand should guarantee that the slag composition meets melting requirement, i.e. roasted ore: coke: lime: the mass ratio of quartz sand=10: 2～5: 4～0: 0～3; For improving the rate of recovery of gold, particularly when the content of gold when high, the reduction ratio of iron be preferably 75% and more than so that golden accumulation rate reaches more than 90% its roasted ore: the mass ratio of coke=10: 1.5～5; Smelting temperature is controlled at 1400～1600 ℃, with 1500～1550 ℃ better.By melting, 90～98% gold is enriched in the pig iron, the enrichment multiplying power of gold in the pig iron, the reduction ratio that depends on iron in the height of roasted ore iron level and the melting, to the roasted ore of iron content about 60%, reduction ratio reaches more than 75%, gold about 1 times of enrichment in the pig iron, gained pig iron main component one example is: Fe 97.27%, C 1.38%, and Si 0.29, and S 0.4, P 0.052, Au 16g/t.
The rich golden pig iron that retailoring obtains is cast as anode block, in the band diaphragm sell, carries out electrolysis.Electrolyte system can be selected for use, FeCl
2With NH
4The Cl aqueous solution, FeCl
2Concentration is at 50～200g/L, and is comparatively suitable with 80～100g/L, NH
4Cl concentration is at 50～200g/L, and comparatively suitable with 80～100g/L, current density is controlled at 50～400A/m
2, with 200～250A/m
2Preferable, electrolyte temperature is controlled at 20～60 ℃, with 40～50 ℃ better.Or select FeSO for use
4Add (NH
4)
2SO
4The aqueous solution, wherein, FeSO
4Concentration is 20～250g/L, and preferred concentration is controlled at 100～150g/L, (NH
4)
2SO
4Concentration is at 50～200g/L, and preferred concentration is at 80～100g/L, and current density is controlled at 50～500A/m
2, with 220～270A/m
2Preferable, 20～70 ℃ of electrolyte temperatures, with 40～55 ℃ for well.In above-mentioned two kinds of electrolyte systems, with FeSO
4Add (NH
4)
2SO
4Water solution system requires lower to equipment material, electrolysis pure iron quality is higher.During electrolysis, anode is inserted in the diaphragm bag, and similar poles are apart from being controlled at about 100mm.Circulation of elecrolyte speed is determined according to the electrolyzer volume, is controlled to be 1～2 groove/h.The electrolysis pure iron has good metal gloss, and certain fragility is arranged, and nonmetallic impurity P is 0.005%, and Si is 0.008%, C trace, S trace.Other impurity meet national Specification.Its typical composition one example is: Fe is greater than 99.95%, and Zn 0.010%, and As is less than 0.001%, and Mn 0.029%, and Pb 0.0040%, and acid non-soluble substance is less than 0.01%.Anode slime rate is about 25%, anode sludge iron content 45%, and gold is enriched in the anode sludge, contains under the condition of golden 16g/t at the rich iron pig iron, and the anode sludge contains gold about 64g/t.
It below is example of the present invention.
Example 1: the roasted ore composition is Fe 60.22%, and Pb 0.78%, and Zn 0.77%, and S 0.25%, and As 0.063%, and Cu 0.061%, and P 0.029%, SiO
29.38%, Al
2O
31.33%, MgO 0.094%, and CaO 1.14, Au 8.28g/t.Adopt the direct current electric arc furnace melting, at roasted ore: coke: the lime quality ratio is under 10: 3: 1 the condition, in 1500 ℃ of following meltings, the iron reduction ratio reaches 98%, and gold 99% is enriched in the pig iron, rich golden pig iron composition is: Fe 97.27%, C 1.38%, and Si 0.29%, and S 0.40%, P 0.052%, Au 13.74g/t.The golden iron founding of richness is become anode, is in master's the electrolyte system, at Fe at ferrous sulfate-ammonium sulfate
2+80g/L, (NH
4)
2SO
480g/L, pH=3.5～4.5, electrolyte temperature is 50～60 ℃, 220～275A/m
2Current density and the bath voltage of 1.0～1.2V, homopolarity width between centers is decided to be 110mm, when adopting diaphragm electrolysis, electrolysis is stable to be carried out, the output iron content greater than 99.5%, the pure iron of impurity in allowed band, electrolysis mean current efficient is greater than 95%, the negative electrode direct current consumption is 1100kwh/t Fe, gold is enriched in the anode sludge, and it contains gold and reaches 53.95g/t.
Example 2: the roasted ore composition is Fe 60.22%, and Pb 0.78%, and Zn 0.77%, and S 0.25%, and As 0.063%, and Cu 0.061%, and P 0.029%, SiO
29.38%, Al
2O
31.33%, MgO 0.094%, and CaO 1.14, Au 8.28g/t.Adopt the direct current electric arc furnace melting, at roasted ore: coke: the lime quality ratio is under 10: 2: 3 the condition, in 1550 ℃ of following meltings, the iron reduction ratio reaches 95%, and gold 98% is enriched in the pig iron, rich golden pig iron composition is: Fe 94.88%, C 0.44%, and Si 2.52%, and S 0.56%, P 0.056%, Au 13.73g/t.The golden iron founding of richness is become anode, is in master's the electrolyte system, at Fe at ferrous sulfate-ammonium sulfate
2+100g/L, (NH
4)
2SO
4100g/L, pH=3.5～4.5, electrolyte temperature is 50～60 ℃, 220～275A/m
2Current density and the bath voltage of 1.0～1.2V, homopolarity width between centers is decided to be 120mm, when adopting diaphragm electrolysis, electrolysis is stable to be carried out, output iron content＞99.5%, the impurity pure iron in allowed band, electrolysis mean current efficient are greater than 95%, and the negative electrode direct current consumption is 1100kwh/tFe, gold is enriched in the anode sludge, and it contains gold and reaches 54.92g/t.
Example 3: the roasted ore composition is Fe 61.22%, and Pb 0.61%, and Zn 0.32%, and S 0.23%, and As 0.17%, and Cu 0.035%, and P 0.04%, SiO
28.15%, Al
2O
31.36%, MgO 0.075%, and CaO 0.73%, Au 30.30g/t.Adopt the direct current electric arc furnace melting, at roasted ore: coke: the lime quality ratio is under 10: 4: 1 the condition, in 1500 ℃ of following meltings, the iron reduction ratio reaches 99%, and gold 99% is enriched in the pig iron, rich golden pig iron composition is: Fe 97.32%, C 1.44%, and Si 0.52%, and S 0.52%, P 0.053%, Au 49.16g/t.The golden iron founding of richness is become anode, is in master's the electrolyte system, at Fe at ferrous sulfate-ammonium sulfate
2+100g/L, (NH
4)
2SO
4100g/L, pH=3.5～4.5, electrolyte temperature is 50～60 ℃, 220～275A/m
2Current density and the bath voltage of 1.0～1.2V, homopolarity width between centers is decided to be 11mm, when adopting diaphragm electrolysis, electrolysis is stable to be carried out, the output iron content greater than 99.5%, the pure iron of impurity in allowed band, electrolysis mean current efficient is greater than 96%, the negative electrode direct current consumption is 1100kwh/tFe, gold is enriched in the anode sludge, and it contains gold and reaches 196.63g/t.
Example 4: the roasted ore composition is Fe 61.22%, and Pb 0.61%, and Zn 0.32%, and S 0.23%, and As 0.17%, and Cu 0.035%, and P 0.04%, SiO
28.15%, Al
2O
31.36%, MgO 0.075%, and CaO 0.73%, Au 30.30g/t.Adopt the direct current electric arc furnace melting, at roasted ore: coke: quartz sand: the lime quality ratio is 15: 3: 2: under 1 the condition, in 1550 ℃ of following meltings, the iron reduction ratio reaches 98.5%, and gold 99.2% is enriched in the pig iron, rich golden pig iron composition is: Fe 97.5%, C 1.32%, and Si 0.43%, and S 0.51%, P 0.043%, Au 51.16g/t.The golden iron founding of richness is become anode, is in master's the electrolyte system, at Fe at ferrous sulfate-ammonium sulfate
2+150g/L, (NH
4)
2SO
480g/L, pH=3.5～4.5, electrolyte temperature is 50～60 ℃, 220～275A/m
2Current density and the bath voltage of 1.0～1.2V, homopolarity width between centers is decided to be 120mm, when adopting diaphragm electrolysis, electrolysis is stable to be carried out, the output iron content greater than 99.6%, the pure iron of impurity in allowed band, electrolysis mean current efficient is greater than 95.2%, the negative electrode direct current consumption is 1100kwh/tFe, gold is enriched in the anode sludge, and it contains gold and reaches 198.52g/t.
Claims (5)
1. the method for a pyrite coated gold mine enrichment gold, it is characterized in that, roasted ore and coke, lime are or/and quartz sand is pressed the ratio of components batching, in 1450～1600 ℃ of following retailoring output pig iron, gold is enriched in the pig iron, the proportioning of coke, the amount that is reduced to metallic iron by the iron that is not less than 50% adds, and lime is or/and the proportioning of quartz sand is pressed the adding of slag type; The golden iron founding of richness is become anode block, carry out electrolysis in the band diaphragm sell, gold is enriched in the anode sludge, and electrolyte body is FeCl
2With NH
4The Cl aqueous solution, FeCl
2Concentration is at 50～200g/L, NH
4Cl concentration is at 50～200g/L, and current density is 50～400A/m
2, electrolyte temperature is 20～60 ℃; Or electrolyte body is FeSO
4With (NH
4)
2SO
4The aqueous solution, FeSO
4Concentration is 20～250g/L, (NH
4)
2SO
4Concentration is at 50～200g/L, and current density is 50～500A/m
2, electrolyte temperature is 20～70 ℃.
2. method according to claim 1 is characterized in that, described ratio of components is roasted ore: coke: lime: the mass ratio of quartz sand=10: 2～5: 4～0: 0～3.
3. method according to claim 1 and 2 is characterized in that, the ratio of components of described coke, and the amount that is reduced to metallic iron by the iron that is not less than 75% adds its roasted ore: the mass ratio of coke=10: 1.5～5.
4. method according to claim 1 and 2 is characterized in that, described roasted ore is with pyrite coated gold mine, comprise that it is raw material that gold utensil has containing of recovery value golden sulphur concentrate, obtain by one section or two-stage roasting, maturing temperature is 500～800 ℃, and roasting time is 1～4h.
5. method according to claim 1 and 2 is characterized in that, described retailoring adopts blast furnace, interchange or direct current electric arc furnace, all kinds of bath smelting furnace to carry out.
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| CN102534244A (en) * | 2011-11-06 | 2012-07-04 | 贵研铂业股份有限公司 | Method for concentrating precious metal from low-grade precious metal material |
| CN102586618A (en) * | 2012-03-31 | 2012-07-18 | 长沙有色冶金设计研究院有限公司 | Process of smelting iron pyrite |
| CN102690942A (en) * | 2012-06-18 | 2012-09-26 | 中南大学 | Method for reduction roasting and fortified acid dissolving of sulfur-containing gold concentrate calcine |
| CN103014319A (en) * | 2012-12-05 | 2013-04-03 | 中南大学 | Method for strengthening gold extraction of iron gold concentrate roasted product containing sulphur and arsenic |
| CN104195591A (en) * | 2014-09-17 | 2014-12-10 | 陈忠 | Comprehensive recovery method for waste iron-based diamond tool |
| CN106944244A (en) * | 2017-03-09 | 2017-07-14 | 昆明理工大学 | A kind of method that coated complex copper oxide ore is recycled |
| CN107794375A (en) * | 2017-04-13 | 2018-03-13 | 湖南有色金属研究院 | A kind of method that gold, silver are extracted from difficult low-grade pyrite cinder |
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| CN102534244A (en) * | 2011-11-06 | 2012-07-04 | 贵研铂业股份有限公司 | Method for concentrating precious metal from low-grade precious metal material |
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| CN102690942A (en) * | 2012-06-18 | 2012-09-26 | 中南大学 | Method for reduction roasting and fortified acid dissolving of sulfur-containing gold concentrate calcine |
| CN103014319A (en) * | 2012-12-05 | 2013-04-03 | 中南大学 | Method for strengthening gold extraction of iron gold concentrate roasted product containing sulphur and arsenic |
| CN104195591A (en) * | 2014-09-17 | 2014-12-10 | 陈忠 | Comprehensive recovery method for waste iron-based diamond tool |
| CN106944244B (en) * | 2017-03-09 | 2018-01-12 | 昆明理工大学 | A kind of method that coated complex copper oxide ore recycles |
| CN106944244A (en) * | 2017-03-09 | 2017-07-14 | 昆明理工大学 | A kind of method that coated complex copper oxide ore is recycled |
| CN107794375A (en) * | 2017-04-13 | 2018-03-13 | 湖南有色金属研究院 | A kind of method that gold, silver are extracted from difficult low-grade pyrite cinder |
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| CN110863218A (en) * | 2019-11-27 | 2020-03-06 | 东北大学 | Method for extracting gold by adopting molten salt electrolysis enrichment |
| CN110863218B (en) * | 2019-11-27 | 2021-11-30 | 东北大学 | Method for extracting gold by adopting molten salt electrolysis enrichment |
| CN113499851A (en) * | 2021-07-10 | 2021-10-15 | 南昌航空大学 | Combined beneficiation method for recycling superfine feldspar ore concentrate from sodium-potassium feldspar ore washing mud residue |
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