CN106884093A - A kind of thick aurin smelting method - Google Patents
A kind of thick aurin smelting method Download PDFInfo
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- CN106884093A CN106884093A CN201710188566.5A CN201710188566A CN106884093A CN 106884093 A CN106884093 A CN 106884093A CN 201710188566 A CN201710188566 A CN 201710188566A CN 106884093 A CN106884093 A CN 106884093A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B11/00—Obtaining noble metals
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The present invention relates to a kind of thick aurin smelting method, comprise the following steps that：(1) thick gold uses salpeter solution digestion, is filtrated to get filter residue I；(2) potassium nitrate is added in filter residue I, is calcined after mixing, obtain fired slags；(3) potassium hydroxide solution digestion is added in fired slags, filter residue II is filtrated to get；(4) by the nitric acid digestion of filter residue II, it is filtrated to get filter residue III；(5) add hydrochloric acid and hydrogen peroxide reaction to be filtrated to get filtrate in filter residue III, process, obtain bronze.More than 99.99%, the method overcomes that general wet method pyrogenic process combination product purity is high, the shortcoming that smelting temperature is high, technological process is complicated, the cycle is long to bronze purity after being refined using this method.
Description
Technical field
The invention belongs to metallurgical technology field, it is related to a kind of thick gold refining technology.
Background technology
Gold is the metal that the mankind more early have found and utilize, and due to rare, special and preciousness, hardware is considered as since ancient times
First of, there is the title of the king of metal.It has high erosion-resisting stability, good electric conductivity and thermal conductivity, the original of gold
Daughter nucleus has the larger effective cross-section caught and grab neutron, has various catalyst properties in the alloy of gold.
The main method of refining has electrolysis, extraction, all-wet refining, wet method-pyrogenic process combination refining at present.
The general principle of electro deposition is：Anode is done with thick gold, under direct current electro ultrafiltration, gold is golden with other more electronegativity
Category enters electrolyte in the form of an ion, because gold ion concentration is big, current potential is high, and gold takes the lead in obtaining electronics precipitation in negative electrode, makes thick gold
Purified.Electrolysis gained fineness of gold is more than 99.99%, and quality is relatively stablized, but electrolysis process has following lacking
Point：(typically requiring thick gold grade more than 90%) high to ingredient requirement；Technical conditions requirement is higher；Production cycle is long；Flow
In overstock a large amount of gold, capital turnover and safeguarding work are made troubles.
Extraction with respect to electrolysis process there is with short production cycle, flow not overstock high, simple to operate excellent of gold, direct yield
Gesture, but the deficiency of extraction is also quite obvious：The selectivity of the extractant of extraction process is little, and extraction reagent disappears
Consumption is big, and production pollution on the environment is larger, and work situation is poor, and waste gas pollution control and treatment is difficult, and extraction typically requires the gold of raw material
Content reaches 80-90%.
General Whote-wet method technique is：Thick bronze sulfuric acid treatment, dissolves away iron, zinc, if silver-colored grade is high then molten with nitric acid
Xie Yin and copper, finally with aqua regia dissolution gold (or make oxidant with the one kind in chlorine, sodium chlorate, potassium chlorate, sodium hypochlorite,
Gold is dissolved in hydrochloric acid solution), insoluble matter (chloride containing silver, lead chloride and silica etc.) is isolated from gold-containing solution
Come, adjust pH value, golden chloro-complex is reduced into bronze with reducing agent oxalic acid (salt) or sulfur dioxide (sulphite), bronze is used
Nitric acid is boiled, and dissolves away the impurity wherein carried secretly, and bronze is repeatedly washed, and removes soluble impurity, is dried, is cast gold
Ingot.It is simple to operate using general wet processing, it is easy to accomplish mechanization, but the purity of the gold for obtaining can only achieve
99.9% or so.
Wet method and pyrogenic process combination smelting process are generally divided into nitric acid point silver, the molten gold of chloroazotic acid, aqua regia residue pyrometallurgical smelting, electrolysis
The techniques such as silver, gold, ingot casting.The shortcoming that the technique is present：One is to contain Jin Heyin in aqua regia residue, it is difficult to melting, in order to ensure back
Yield, reduces slag taste, and during melting, temperature has reached 1000-1100 DEG C or so, smelting time reach 10h with
On, cause gold and silver to volatilize；Two is complicated technological process, and equipment is various, and operating condition is poor；Three is if the content of gold will reach
99.99%, it is necessary to further refining is carried out using electrolysis, extraction or chemical method again and can be only achieved requirement.
The patent of Patent No. 011000597 discloses Amminochloride process of purifying gold, mainly including following
Step：Nitric acid removal of impurities, filtration washing, chlorination leaching gold, filtration washing, golden reduction, filtration washing, golden melting, this method solve
The complicated shortcoming of technological process in general wet method and pyrogenic process combination smelting process, but the method smelting temperature reaches 1250 DEG C,
The shortcoming high of temperature in fusion process is not fully solved.
The patent of Application No. 2014106516324 discloses a kind of method of Enrichment purification gold, what the method was used
Technical scheme is：Configuration alloy, sulfuric acid oxidation dissolving, Alkaline solubilization, nitric acid oxidation dissolving, wherein configuration alloy is that gold is first
Jewelry alloy waste material sprinkles pearl after being melted at 1100-1250 DEG C with tough cathode, and then water quenching obtains alloy bead in the hot water, leads to
The principle for crossing continuous enrichment realizes efficiently concentrating and the purification of gold.Smelting temperature is not complete at 1100-1250 DEG C in the method
Determine wet method-pyrogenic process of complete solution is combined the problem of smelting process.
The content of the invention
In view of this, it is an object of the invention to provide a kind of thick aurin smelting method, the method uses general wet method and pyrogenic process
It is combined, as long as the gold content in thick gold is more than 70%, it is possible to refined using this method, and the product for obtaining
In, gold content reaches more than 99.99%.Overcome general wet method-pyrogenic process not high enough, pyrometallurgical smelting that is combined method product purity
Temperature is high, the complicated shortcoming of technological process.The method raw material grade requirement is low, product grade is high, with short production cycle, operation letter
It is single, easily realize mechanization.
The invention provides a kind of thick aurin smelting method, comprise the following steps that：
(1) thick gold uses salpeter solution digestion, filters, and obtains filter residue I；
(2) potassium nitrate is added in filter residue I, is calcined after mixing, obtain fired slags；
(3) by fired slags and potassium hydroxide solution digestion, it is filtrated to get filter residue II；
(4) by the nitric acid digestion of filter residue II, filtering obtains filter residue III；
(5) hydrochloric acid and hydrogen peroxide reaction are added in filter residue III, is filtrated to get filtrate；Treatment, obtains bronze.
Preferably, in step (1), the mass percent of the nitric acid is 15-30%, the weighing body of thick gold and salpeter solution
Product is than being 1:1-3.
Preferably, in step (2), the temperature of the roasting is 450-600 DEG C.
Preferably, in step (2), the nitric acid potassium application rate is the 10%-40% of the weight of filter residue I.
Preferably, in step (3), the mass percent of described potassium hydroxide solution is 10-40%, fired slags and hydrogen-oxygen
The w/v for changing potassium solution is 1:1-3.
Preferably, in step (4), the mass percent of the nitric acid is 10-20%, and filter residue II is 1 with the weight of nitric acid:
1-3。
Preferably, in step (5), the volumetric concentration of hydrochloric acid is 15-36%.
Preferably, in step (5), the volume of the hydrogen peroxide is 0.2-0.4 times of hydrochloric acid volume.
Preferably, concretely comprising the following steps for filtrate is obtained in step (5)：Hydrochloric acid is added in filter residue III, is heated and is stirred, then
Hydrogen peroxide is added, is reacted, filtering obtains filtrate.
Preferably, it is that filtrate is adjusted into pH value in 1.5-3 the step for the treatment of in step (5), heats and stir, adds
Oxalic acid, reaction, filtering, drying obtains bronze.
Beneficial effects of the present invention：The present invention adds potassium nitrate in firing stage, can allow the metal congruent melting for being insoluble in soda acid
Body, antimony metal, metal impurities are soluble in the metal oxide of acid and are dissolved in the burnt antimony of alkali in roasting with the generation of nitric acid nak response
Sour potassium, so that for the follow-up impurity that further removes lays the foundation.
The temperature of roasting is only needed at 450-600 DEG C, compared to 1000-1200 DEG C of general gold pyrometallurgical smelting, temperature
It is relatively very low, and the time of melting is very short, being capable of the effectively save energy.
The impurity of thick gold is mainly silver, antimony, iron, copper, silicon, and, in 70-90%, thick bronze first can with nitric acid digestion for gold content
To remove most silver, iron, copper, also a small amount of metal (such as antimony), the metal impurities existed with eutectic or metal inclusion
It is difficult to be dissolved with soda acid and removes, add potassium nitrate to be calcined in filter residue I, indissoluble impurity antimony can generates molten with nitric acid nak response
In the potassium pyroantimonate of alkali, other metal impurities can be soluble in the metal oxide of acid with the generation of nitric acid nak response, and fired slags pass through
Can be dissolved in alkaline solution for foreign metal antimony and impurity silicon and remove by potassium hydroxide digestion, and potassium hydroxide digestion slag is through pernitric acid
Digestion can further remove impurity silver, iron, copper, and by above step, the impurity in thick gold is eliminated substantially, subsequently by gold
Be dissolved in the solution of hydrochloric acid and hydrogen peroxide, filtering can remove impurity silicon and remaining argentalium, Jinliu in the solution, by also
It is former and clean and obtain the bronze that purity reaches more than 99.99%, and the rate of recovery of gold reaches more than 98%.
Using step of the invention, first most energy dissolved impurity is removed, then for indissoluble impurity antimony, metal
Eutectic, metal inclusion, add potassium nitrate to carry out calcination process in leached mud I, and antimony is changed into the pyroantimonic acid for being soluble in alkali
Potassium, other converting metal impurities are the metal oxide for being soluble in acid, and fired slags digestion in potassium hydroxide is molten by potassium pyroantimonate
Solution is removed, and other metal impurities are further removed by nitric acid digestion again, thus eliminates the impurity in thick gold substantially
, then pass through the dissolving of gold and separate out the impurity in the thick gold of further removing, so that impurity is substantially completely eliminated, and is obtained
Gold content is 99.99% gold.
Compared to electrolysis and extraction, the gold content requirement to raw material is reduced the present invention, and overcomes general wet method
The method of refining product purity that is combined with pyrogenic process not enough, gold and silver be difficult to the complicated shortcoming of melting, technological process, life of the invention
Produce step fewer, with short production cycle, method and simple to operate, it is easy to accomplish mechanization, the pollution to environment is small.
Specific embodiment
Embodiment 1
Slightly the percentage composition of golden each composition is：Gold 70.35%, silver 20.05%, copper 3.32%, iron 3.19%, antimony
1.64%, silicon 1.35%.Implementation steps are as follows：
(1) the thick bronzes of 50.4879g are weighed, addition mass fraction is 20% salpeter solution 100mL, is placed in digestion on electric furnace
2h, filtering, filter residue I is washed with deionized 3 times, and filter residue weight in wet base is 39.3214g.
(2) step (1) is obtained filter residue I adds 16g potassium nitrate, mixes, and send the Muffle kiln roasting 1.5h, sintering temperature to be
600℃。
(3) it is 25% potassium hydroxide solution 80mL digestion 1h that the fired slags that step (2) is obtained add mass fraction, is filtered,
Filter residue II is washed with deionized 3 times.
(4) it is 15% salpeter solution 80mL digestion 1h, filtering, filter residue that the filter residue II that step (3) is obtained adds mass fraction
III is washed 3 times with 5% salpeter solution.
(5) filter residue III that step (4) is obtained adds mass fraction for 20% hydrochloric acid solution 80mL is placed in magnetic agitation water-bath
In pot, bath temperature is 85 DEG C, under conditions of magnetic agitation, 20mL hydrogen peroxide is slowly added to constant flow pump, reacts 2h, reaction
The deionized water dilution of 80mL, cooling and standings 0.5h, filtering is added to obtain filtrate, the deionized water foam washing 3 of filter residue IV after end
It is secondary.
(6) step (5) gained filtrate adjusts pH value in 1.5-3 with saturation sodium hydroxide solution, is placed in magnetic agitation water-bath
In pot, bath temperature is 85 DEG C, under conditions of magnetic agitation, adds 37g oxalic acid reaction 1h, is filtered while hot, bronze quality
Fraction is 10% salpeter solution foam washing 2 times, then with deionized water foam washing 3 times, drying, ingot casting, gold content is 99.992%,
Weight is 34.8075g, and the rate of recovery of gold is 98%.
Embodiment 2
Slightly bronze composition is：Gold 70.35%, silver 20.05%, copper 3.32%, iron 3.19%, antimony 1.64%, silicon 1.35%.
Implementation steps are as follows：
(1) the thick bronzes of 50.3245g are weighed, addition mass fraction is 20% salpeter solution 100mL, is placed in digestion on electric furnace
1h, filtering, filter residue I is washed with deionized 3 times, and filter residue weight in wet base is 38.3214g.
(2) step (1) is obtained filter residue I adds 16g potassium nitrate, mixes, and send the Muffle kiln roasting 2h, sintering temperature to be
500℃。
(3) it is 5% that the fired slags that step (2) is obtained add mass fraction
Potassium hydroxide solution 200mL digestion 1h, filtering, filter residue II is washed with deionized 3 times.
(4) it is 15% salpeter solution 110mL digestion 1h, filtering, filter residue that the filter residue II that step (3) is obtained adds mass fraction
Washed with 5% salpeter solution 3 times.
(5) filter residue III that step (4) is obtained adds mass fraction for 15% hydrochloric acid solution 110mL is placed in magnetic agitation water-bath
In pot, bath temperature is 85 DEG C, under conditions of magnetic agitation, 40mL hydrogen peroxide is slowly added to constant flow pump, reacts 2h, reaction
The deionized water dilution of 170mL, cooling and standings 0.5h, filtering is added to obtain filtrate, the deionized water foam washing of filter residue IV after end
3 times.
(6) step (5) gained filtrate adjusts pH value in 1.5-3 with saturation sodium hydroxide solution, is placed in magnetic agitation water-bath
In pot, bath temperature is 85 DEG C, under conditions of magnetic agitation, adds 37g oxalic acid reaction 1h, is filtered while hot, bronze quality
Fraction is 10% salpeter solution foam washing 2 times, then with deionized water foam washing 3 times, drying, ingot casting, gold content is 99.991%,
Weight is 34.6952g, and the rate of recovery of gold is 98%.
Embodiment 3
Slightly bronze composition is：Gold 81.15%, silver 11.27%, copper 2.37%, iron 2.08%, antimony 1.70%, silicon 1.43%.
Implementation steps are as follows：
(1) the thick bronzes of 50.5064g are weighed, addition mass fraction is 30% salpeter solution 45mL, is placed in digestion on electric furnace
1h, filtering, filter residue I is washed with deionized 3 times, and filter residue weight in wet base is 39.5324g.
(2) step (1) is obtained filter residue I adds 8g potassium nitrate, mixes, and send the Muffle kiln roasting 1.5h, sintering temperature to be
500℃。
(3) it is 30% potassium hydroxide solution 45mL digestion 1h that the fired slags that step (2) is obtained add mass fraction, is filtered,
Filter residue II is washed with deionized 3 times.
(4) it is 30% salpeter solution 45mL digestion 1h, filtering, filter residue that the filter residue II that step (3) is obtained adds mass fraction
Washed with 5% salpeter solution 3 times.
(5) filter residue III that step (4) is obtained adds mass fraction for 35% hydrochloric acid solution 55mL is placed in magnetic agitation water-bath
In pot, bath temperature is 80 DEG C, under conditions of magnetic agitation, 22mL hydrogen peroxide is slowly added to constant flow pump, reacts 2h, reaction
The deionized water dilution of 110mL, cooling and standings 1h, filtering is added to obtain filtrate, the deionized water foam washing 3 of filter residue IV after end
It is secondary.
(6) step (5) gained filtrate adjusts pH value in 1.5-3 with saturation sodium hydroxide solution, is placed in magnetic agitation water-bath
In pot, bath temperature is 80 DEG C, under conditions of magnetic agitation, adds 44g oxalic acid reaction 1h, is filtered while hot, bronze quality
Fraction is 10% salpeter solution foam washing 2 times, then with deionized water foam washing 3 times, drying, ingot casting, gold content is 99.992%,
Weight is 40.2483g, and the rate of recovery of gold is 98.2%.
Embodiment 4
Slightly bronze composition is：Gold 90.64%, silver 6.47%, copper 1.25%, iron 0.78%, antimony 0.53%, silicon 0.33%.
Implementation steps are as follows：
(1) the thick bronzes of 50.5647g are weighed, addition mass fraction is 15% salpeter solution 100mL, is placed in digestion on electric furnace
1h, filtering, filter residue I is washed with deionized 3 times, and filter residue weight in wet base is 46.9677g.
(2) step (1) is obtained filter residue I adds 4.6g potassium nitrate, mixes, and send the Muffle kiln roasting 2h, sintering temperature to be
600℃。
(3) it is 10% potassium hydroxide solution 100mL digestion 1h that the fired slags that step (2) is obtained add mass fraction, is filtered,
Filter residue II is washed with deionized 3 times.
(4) it is 30% salpeter solution 45mL digestion 1h, filtering, filter residue that the filter residue II that step (3) is obtained adds mass fraction
Washed with 5% salpeter solution 3 times.
(5) filter residue III that step (4) is obtained adds mass fraction for 35% hydrochloric acid solution 70mL is placed in magnetic agitation water-bath
In pot, bath temperature is 90 DEG C, under conditions of magnetic agitation, 25mL hydrogen peroxide is slowly added to constant flow pump, reacts 2h, reaction
The deionized water dilution of 110mL, cooling and standings 1h, filtering is added to obtain filtrate, the deionized water foam washing 3 of filter residue IV after end
It is secondary.
(6) step (5) gained filtrate adjusts pH value in 1.5-3 with saturation sodium hydroxide solution, is placed in magnetic agitation water-bath
In pot, bath temperature is 90 DEG C, under conditions of magnetic agitation, adds 46g oxalic acid reaction 1h, is filtered while hot, bronze quality
Fraction is 10% salpeter solution foam washing 2 times, then with deionized water foam washing 3 times, drying, ingot casting, gold content is 99.993%,
Weight is 45.0561g, and the rate of recovery of gold is 98.3%.
Comparative example
Slightly bronze composition is：Gold 70.35%, silver 20.05%, copper 3.32%, iron 3.19%, antimony 1.64%, silicon 1.35%.
Implementation steps are as follows：
(1) the thick bronzes of 50.3245g are weighed, addition mass fraction is 20% salpeter solution 100mL, is placed in digestion on electric furnace
1h, filtering, filter residue I is washed with deionized 3 times, and filter residue weight in wet base is 38.3214g.
(2) filter residue I that step (1) is obtained adds 16g NaOH to send Muffle kiln roasting 2h, and sintering temperature is 500 DEG C.
(3) it is 5% potassium hydroxide solution 200mL digestion 1h that the fired slags that step (2) is obtained add mass fraction, is filtered,
Filter residue II is washed with deionized 3 times.
(4) it is 15% salpeter solution 110mL digestion 1h, filtering, filter residue that the filter residue II that step (3) is obtained adds mass fraction
Washed with 5% salpeter solution 3 times.
(5) filter residue III that step (4) is obtained adds mass fraction for 15% hydrochloric acid solution 110mL is placed in magnetic agitation water-bath
In pot, bath temperature is 85 DEG C, under conditions of magnetic agitation, 40mL hydrogen peroxide is slowly added to constant flow pump, reacts 2h, reaction
The deionized water dilution of 170mL, cooling and standings 0.5h, filtering is added to obtain filtrate, the deionized water foam washing of filter residue IV after end
3 times.
(6) step (5) gained filtrate adjusts pH value in 1.5-3 with saturation sodium hydroxide solution, is placed in magnetic agitation water-bath
In pot, bath temperature is 85 DEG C, under conditions of magnetic agitation, adds 37g oxalic acid reaction 1h, is filtered while hot, bronze quality
Fraction is 10% salpeter solution foam washing 2 times, then with deionized water foam washing 3 times, drying, ingot casting, gold content is 98.02%,
Weight is 36.9124g, and the rate of recovery of gold is 90%.
Comparative example is contrasted with embodiment 2, differs primarily in that roasting process of the embodiment 2 in step (2)
In add the potassium nitrate of 60g, and added in comparative example is NaOH, the gold content of the gold that embodiment 2 is obtained
It is 99.991%, the rate of recovery of gold is 98%, and the gold content that comparative example obtains gold is 98.02%, the recovery of gold
Rate is 90%, and the result of embodiment 2 and comparative example is displayed in firing stage and adds effect of the potassium nitrate with protrusion, significantly
Improve the gold content of gold after refining.General wet refining process, gold content can only achieve 99.9%, and it is special to generally require
Treatment could cause that the gold content of gold reaches 99.99%, compared to general wet refining process, the gold of this patent gold
Content reaches more than 99.99%, and with prominent effect, compared to refinery practice associated with general wet method and pyrogenic process, this is specially
The step of profit is simple, easily realizes, and the temperature of roasting only has 450-600 DEG C, and temperature is relatively low, can the effectively save energy.
Claims (10)
1. a kind of thick aurin smelting method, it is characterised in that comprise the following steps：
(1) thick gold uses salpeter solution digestion, filters, and obtains filter residue I；
(2) potassium nitrate is added in filter residue I, is calcined after mixing, obtain fired slags；
(3) fired slags are added into potassium hydroxide solution digestion, is filtrated to get filter residue II；
(4) by the nitric acid digestion of filter residue II, filtering obtains filter residue III；
(5) hydrochloric acid and hydrogen peroxide reaction are added in filter residue III, is filtrated to get filtrate；Treatment, obtains bronze.
2. thick aurin smelting method according to claim 1, it is characterised in that in step (1), the quality percentage of the nitric acid
Number is 15-30%, and thick gold is 1 with the w/v of salpeter solution:1-3.
3. thick aurin smelting method according to claim 1, it is characterised in that in step (2), the temperature of the roasting is
450-600℃。
4. thick aurin smelting method according to claim 1, it is characterised in that in step (2), nitric acid potassium application rate is filter residue I
The 10%-40% of weight.
5. thick aurin smelting method according to claim 1, it is characterised in that in step (3), described potassium hydroxide solution
Mass percent be 5-30%, the w/v of fired slags and potassium hydroxide solution is 1:1-3.
6. thick aurin smelting method according to claim 1, it is characterised in that in step (4), the quality percentage of the nitric acid
Number is 10-20%, and filter residue II is 1 with the w/v of nitric acid:1-3.
7. thick aurin smelting method according to claim 1, it is characterised in that in step (5), the volumetric concentration of hydrochloric acid is
15-36%.
8. thick aurin smelting method according to claim 1, it is characterised in that in step (5), the volume of the hydrogen peroxide is
0.2-0.4 times of hydrochloric acid volume.
9. the thick aurin smelting method according to claim any one of 1-8, it is characterised in that step obtains filtrate in (5)
Concretely comprise the following steps：Hydrochloric acid is added in filter residue III, is heated and is stirred, be subsequently adding hydrogen peroxide, reacted, filtering obtains filtrate.
10. the thick aurin smelting method according to claim any one of 1-8, it is characterised in that in step (5) the step for the treatment of
For, filtrate is adjusted into pH value in 1.5-3, heat and stir, oxalic acid is added, to react, filtering, drying obtains bronze.
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| CN107576754A (en) * | 2017-07-27 | 2018-01-12 | 长春黄金研究院 | A kind of Cupper determination method in thick gold |
| US11319613B2 (en) | 2020-08-18 | 2022-05-03 | Enviro Metals, LLC | Metal refinement |
| CN114453589A (en) * | 2022-02-18 | 2022-05-10 | 贵研铂业股份有限公司 | Preparation method of high-purity gold |
| CN114577977A (en) * | 2022-03-30 | 2022-06-03 | 山东省地质矿产勘查开发局第六地质大队(山东省第六地质矿产勘查院) | Analysis method of gold ore containing graphite and sample roasting effect analysis equipment thereof |
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| US11319613B2 (en) | 2020-08-18 | 2022-05-03 | Enviro Metals, LLC | Metal refinement |
| US11578386B2 (en) | 2020-08-18 | 2023-02-14 | Enviro Metals, LLC | Metal refinement |
| CN114453589A (en) * | 2022-02-18 | 2022-05-10 | 贵研铂业股份有限公司 | Preparation method of high-purity gold |
| CN114577977A (en) * | 2022-03-30 | 2022-06-03 | 山东省地质矿产勘查开发局第六地质大队(山东省第六地质矿产勘查院) | Analysis method of gold ore containing graphite and sample roasting effect analysis equipment thereof |
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