CN106119566A - A kind of hot pressing recovery method of the difficult gold mine of arsenic-containing sulphur-containing - Google Patents
A kind of hot pressing recovery method of the difficult gold mine of arsenic-containing sulphur-containing Download PDFInfo
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- CN106119566A CN106119566A CN201610684025.7A CN201610684025A CN106119566A CN 106119566 A CN106119566 A CN 106119566A CN 201610684025 A CN201610684025 A CN 201610684025A CN 106119566 A CN106119566 A CN 106119566A
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- Prior art keywords
- gold
- oxidation
- ore pulp
- thiourea
- arsenic
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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
- C22B11/04—Obtaining noble metals by wet processes
Abstract
The invention discloses the hot pressing recovery method of the difficult gold mine of a kind of arsenic-containing sulphur-containing, process gold mine containing Au10 20g/t, sulfur 4% 20%, ferrum 20% 30%, arsenic 0.5% 18%, carbonate 5% 10%, copper≤0.8%, gold more than 80% cures thing parcel；Operating procedure: gold mine is through wet ball-milling pre-acidified after regulating concentration；Then by ore pulp hot-pressure oxidation；And then by dense for the ore pulp after oxidation, overflowing liquid returns pre-acidified operation；Thickened underflow adds clear water again size mixing to ore pulp mass concentration 25% 30% Fe that controls in liquid phase3+And sulfuric acid concentration；Being subsequently added thiourea and carry out acidic leaching, the thiourea concentration controlled in liquid phase is 1 ‰ 4.8 ‰, air stirring；Eventually pass filter washing, tailings removes Tailings Dam, your liquid reclaims gold, lean solution is sized mixing before returning leaching gold after supplementing thiourea.The method has gold recovery height, flow process is short, production cost is low, production processes free of contamination advantage.
Description
Technical field
The present invention relates to hydrometallurgical technology, be specifically related to the hot pressing recovery method of the difficult gold mine of a kind of arsenic-containing sulphur-containing.
Background technology
At present, to containing Au10-20g/t, sulfur-bearing 4-20%, iron content 20-30%, containing arsenic 0.5-18%, carbonate containing 5-10%, contain
Difficult gold (smart) ore deposit of copper≤0.8%, gold more than 80% cure thing parcel.Due to the type gold (smart) ore deposit arsenic-containing sulphur-containing, and
Gold mainly cure thing parcel, direct Aurous cyanide leaching rate is low.At present the Ore to sulfide trapping gold mainly have roasting oxidation,
Biological oxidation and hot-pressure oxidation three kinds process technique.
(1) roasting technique is traditional handicraft, is decomposed by sulfide-oxidation by high-temperature roasting, so that gold exposes, then leads to
Cross gold lixivant and leach recovery gold.Owing to the gold of fine particles easily forms secondary capsulation in roasting, so the response rate of gold
The highest, only 70%-85%, and process during the Ore being more than 0.5% containing arsenic seriously polluted, therefore the method is difficult to be used.
(2) biological oxidation is a kind of oxidation technology more friendly to environment, in terms of difficult-treating gold mine oxidation carries gold also
Increasing application, although the method gold recovery is higher, typically up to 90%-92%, but its shortcoming to be oxidation cycle long, right
Ore adaptability is poor, aoxidizes the most thorough.
(3) hot-pressure oxidation is the maximally effective technique processing sulfide parcel gold mine, has oxidation thorough, high-efficiency environment friendly
Advantage, can process containing arsenic ore, and the hot-pressure oxidation time only needs 60-120 minute, and oxidizing slag Aurous cyanide leaching rate typically can reach
About 95%.But owing to hot-pressure oxidation is oxidized technique, sulfur is oxidized to sulphuric acid and sulfate radical, cause aoxidize ore pulp containing acid,
Iron content is high, to arrange multistage washing before cyaniding, and acid elution rate typically to reach more than 92%, and acid solution needs to come with substantial amounts of alkali
Neutralizing, oxidation ore pulp also needs to add alkali and is neutralized to pH value more than 10 and just can carry out cyanidation gold-extracted, and acid-base chemical conversion makes backend process
Processing cost higher, for the Ore containing the relatively low especially less than 20g/t of gold, economic benefit is poor.
Thiourea is also known as sulfuration urea element (H2NCSNH2) it is a kind of organic compound, toxicity is more much lower than Cyanogran., at acid bar
Part and with the presence of can be as the Selectively leaching medicament of gold silver under conditions of oxidant, the more commonly used method is to adjust with sulphuric acid
Joint ore pulp, to acid, adds Fe3+Salt is as oxidant, and extraction time is the shortest, and the reasonable leaching rate of technology controlling and process can be with cyaniding
Quite, your liquid can use the means such as charcoal absorption, displacement, electrodeposition to reclaim, existing many places application in the process of difficult-treating gold mine, is
One the most promising non-cyanide leaching gold technique[1]([1] list of references: editorial board, golden production technique guide [M]. geology goes out
Version society, 2000:346-357).
Summary of the invention
The present invention process difficult gold (smart) ore deposit be containing Au10-20g/t, sulfur-bearing 4%-20%, iron content 20%-30%, containing arsenic
0.5%-18%, carbonate 5%-10%, cupric≤0.8%, gold more than 80% cure thing parcel.
It is an object of the invention to provide a kind of gold recovery height, flow process is short, production cost is low, production processes environmental sound
The hot pressing recovery method of the difficult gold mine of arsenic-containing sulphur-containing changed.
For realizing object above, the gold mine that the hot pressing recovery method of the difficult gold mine of a kind of arsenic-containing sulphur-containing of the present invention processes contains
Au10-20g/t, sulfur-bearing 4%-20%, iron content 20%-30%, containing arsenic 0.5%-18%, carbonate 5%-10%, cupric≤0.8%, gold 80%
The thing that more than cures wraps up；Use gold mine pre-acidified--hot-pressure oxidation--1 grade dense--Gold Leaching In Thiourea Solutions technique, concrete operation step
As follows with technological parameter:
(1), gold (smart) ore deposit carry out wet ball-milling, being milled to granularity-0.074mm is 94%-98%；
(2), the ore pulp mass concentration after ball milling carries out pre-acidified, to remove the carbonate in Ore after being adjusted to 15%-30%；
(3), after acidifying, ore pulp carries out hot-pressure oxidation, hot pressing temperature 200-220 DEG C, oxygen partial pressure 0.5-0.8Mpa, sulfur oxidation rate
96.5%-99.5%, sulfur acid 20-45g/L in oxidation solution, containing Fe3+4-16g/L, containing Fe2+ 0-2.5g/L；
(4), oxidation after ore pulp carry out dense, thickened underflow ore pulp mass concentration 40%-45%, overflowing liquid return pre-acidified work
Sequence, acid elution rate 60%-70%；
(5), thickened underflow add clear water and size mixing to ore pulp mass concentration 25%-30%, control the Fe in liquid phase3+Concentration 0.5-8g/L,
Sulfuric acid concentration 2-15g/L；
(6), adding thiourea and carry out acidic leaching, the thiourea concentration controlled in liquid phase is 1 ‰-4.8 ‰, fills air stirring, stirring
Linear velocity 2.5-4.2m/s, aeration quantity 4-8Nm/(h), extraction time 10-16 hour；
(7), filtration washing, tailings removes Tailings Dam, and your liquid reclaims gold, and lean solution is sized mixing before returning leaching gold after supplementing thiourea.
By adding sulphuric acid realization when described (2nd) step pre-acidified is to start, by (4th) the dense operation of step after normal operation
Overflow oxidation solution be returned as main, sulphuric acid is as supplementing.
The technical characterstic of the hot pressing recovery method of the above-mentioned difficult gold mine of a kind of arsenic-containing sulphur-containing and having the beneficial effect that:
1, the feature of sulphide ore hot-pressure oxidation technique is utilized, containing sulphuric acid, Fe in ore pulp after oxidation3+, select thiourea as leaching gold
Medicament, leaching gold process is acid, need oxidant Fe to utilize it3+, affected little feature by copper plasma, oxidation ore pulp in regard to energy
Acid system needed for offer and Fe3+Ion, it is to avoid the acid-base chemical conversion in technical process and outer adding medicine, and more than Appropriate application
Acid, the advantage having given full play to hot pressing and Gold Leaching In Thiourea Solutions, it is possible to achieve the high efficiente callback of gold in difficult-treating gold mine, the response rate of gold
Up to more than 95%.
2, can process the difficult-treating gold mine high containing arsenic, beneficially hot-pressure oxidation technique with safety and environmental protection, arsenic is converted into can
The ferric arsenate of long-term innoxious storage.
3, shorten technological process, simplify equipment investment, greatly reduce production cost, for the type difficult-treating gold mine
Exploitation provide effective technical scheme.
Detailed description of the invention
The hot pressing recovery method that three embodiment to the present invention a kind of arsenic-containing sulphur-containing difficult gold mines are set forth below is made into one
Step describes in detail.
Embodiment 1
Certain golden ore concentrate hard to treat, containing Au14g/t, sulfur-bearing 16%, iron content 26.3%, containing arsenic 2.8%, Ore carbonate containing 8%, cupric
0.22%, gold 85% cure thing parcel.
--hot-pressure oxidation--1 grade dense--Gold Leaching In Thiourea Solutions technique, concrete operation step and technique are joined to use gold mine pre-acidified
Number is as follows:
(1), gold (smart) ore deposit carry out wet ball-milling, being milled to granularity-0.074mm is 97%；
(2) the ore pulp mass concentration, after ball milling carries out pre-acidified after being adjusted to 20%, and the mode returned with sulphuric acid and oxidation solution removes
Carbonate in Ore；
(3), after acidifying, ore pulp carries out hot-pressure oxidation, hot pressing temperature 210 DEG C, oxygen partial pressure 0.6Mpa, sulfur oxidation rate 98.5%, oxygen
Change sulfur acid 35g/L in liquid, containing Fe3+12g/L, containing Fe2+ 0.25g/L；
(4), oxidation after ore pulp carry out dense, thickened underflow ore pulp mass concentration 42%, overflowing liquid return pre-acidified operation, acid
Washing ratio 65%；
(5), thickened underflow add clear water and size mixing to ore pulp mass concentration 28%, control the Fe in liquid phase3+Concentration 5.2g/L, sulphuric acid is dense
Degree 8.5g/L；
(6), adding thiourea and carry out acidic leaching, the thiourea concentration controlled in liquid phase is 2 ‰, fills air stirring, stirs linear velocity
3.4m/s, aeration quantity 5Nm/(h), extraction time 12 hours；
(7), filtration washing, tailings removes Tailings Dam, and your liquid reclaims gold, and lean solution is sized mixing before returning leaching gold after supplementing thiourea.
The response rate of this embodiment gold is up to 96.2%.
Embodiment 2
Certain golden ore concentrate hard to treat, containing Au10g/t, sulfur-bearing 4%, iron content 20%, containing arsenic 0.5%, Ore carbonate containing 5%, cupric
0.08%, gold 80% cure thing parcel.
--hot-pressure oxidation--1 grade dense--Gold Leaching In Thiourea Solutions technique, concrete operation step and technique are joined to use gold mine pre-acidified
Number is as follows:
(1), gold (smart) ore deposit carry out wet ball-milling, being milled to granularity-0.074mm is 94%；
(2) the ore pulp mass concentration, after ball milling carries out pre-acidified after being adjusted to 30%, and the mode returned with sulphuric acid and oxidation solution removes
Carbonate in Ore；
(3), after acidifying, ore pulp carries out hot-pressure oxidation, hot pressing temperature 210 DEG C, oxygen partial pressure 0.5Mpa, sulfur oxidation rate 99.5%, oxygen
Change sulfur acid 20g/L in liquid, containing Fe3+4g/L, containing Fe2+ 0.1g/L；
(4), oxidation after ore pulp carry out dense, thickened underflow ore pulp mass concentration 40%, overflowing liquid return pre-acidified operation, acid
Washing ratio 60%；
(5), thickened underflow add clear water and size mixing to ore pulp mass concentration 30%, control the Fe in liquid phase3+Concentration 0.5g/L, sulphuric acid is dense
Degree 2g/L；
(6), adding thiourea and carry out acidic leaching, the thiourea concentration controlled in liquid phase is 1 ‰, fills air stirring, stirs linear velocity
2.5m/s, aeration quantity 4Nm/(h), extraction time 10 hours；
(7), filtration washing, tailings removes Tailings Dam, and your liquid reclaims gold, and lean solution is sized mixing before returning leaching gold after supplementing thiourea.
The response rate of this embodiment gold is up to 95.4%.
Embodiment 3
Certain golden ore concentrate hard to treat, containing Au20g/t, sulfur-bearing 20%, iron content 30%, containing arsenic 18%, Ore carbonate containing 10%, cupric
0.8%, gold 91% cure thing parcel.
--hot-pressure oxidation--1 grade dense--Gold Leaching In Thiourea Solutions technique, concrete operation step and technique are joined to use gold mine pre-acidified
Number is as follows:
(1), gold (smart) ore deposit carry out wet ball-milling, being milled to granularity-0.074mm is 99.5%；
(2) the ore pulp mass concentration, after ball milling carries out pre-acidified after being adjusted to 15%, and the mode returned with sulphuric acid and oxidation solution removes
Carbonate in Ore；
(3), after acidifying, ore pulp carries out hot-pressure oxidation, hot pressing temperature 220 DEG C, oxygen partial pressure 0.8Mpa, sulfur oxidation rate 96.5%, oxygen
Change sulfur acid 45g/L in liquid, containing Fe3+16g/L, containing Fe2+ 2.5g/L；
(4), oxidation after ore pulp carry out dense, thickened underflow ore pulp mass concentration 45%, overflowing liquid return pre-acidified operation, acid
Washing ratio 70%；
(5), thickened underflow add clear water and size mixing to ore pulp mass concentration 25%, control the Fe in liquid phase3+Concentration 8g/L, sulfuric acid concentration
15g/L；
(6), adding thiourea and carry out acidic leaching, the thiourea concentration controlled in liquid phase is 4.8 ‰, fills air stirring, stirs linear speed
Degree 4.2m/s, aeration quantity 8Nm/(h), extraction time 16 hours；
(7), filtration washing, tailings removes Tailings Dam, and your liquid reclaims gold, and lean solution is sized mixing before returning leaching gold after supplementing thiourea.
The response rate of this embodiment gold is up to 95.2%.
Contrast three above embodiment, the comprehensive technical indexes of embodiment 1 is more preferable, is most preferred embodiment.
Preliminary Cost comparisons is carried out as a example by example 1:
If the directly Aurous cyanide leaching rate of the Ore in embodiment 1 only has 31%, therefore does not typically use；Complete according to conventional hot pressing
Aoxidizing the gold leaching rate 96% during-3 grades of CCD washing-acid-base chemical conversion-cyanidation technologies, whole process manufacturing cost (do not wrap by direct cost
Include depreciation and financial cost) it is 720 yuan/ton of concentrate, wherein neutralize medicament (limestone+Calx) cost 215 yuan/ton, account for
30%。
After using the method for the present invention, owing to oxidation ore pulp uses Gold Leaching In Thiourea Solutions, original oxide ore can be taken full advantage of
Sulphuric acid in slurry system and Fe3+Ion, oxidation ore pulp only needs a concentrator can complete solid-liquor separation, and acid elution rate controls
65%, the acid solution of 65% returns pre-acidified, and 35% brings oxidation ore pulp into, directly adds thiourea medicament by lean solution after sizing mixing
Carry out the leaching operation of gold, eliminate 2 concentrators, eliminate CCD washing, solution neutralizes, before ore pulp cyaniding three of alkali tune
Operation, leaching gold the time be reduced to 12 hours from 48 hours, shorten flow process, the most directly save neutralize medicament cost so that
Full-range manufacturing cost decreases 204 yuan/ton, accounts for former manufacturing cost 28.3%, is greatly improved overall efficiency.
It should be pointed out that, the application of the present invention is not limited to above-mentioned citing, for those of ordinary skills, exist
Without departing from the principles of the invention, it is also possible to improved according to the above description or modify, all these improvement or modification
All should fall in the protection domain of the claims in the present invention.
Claims (2)
1. a hot pressing recovery method for the difficult gold mine of arsenic-containing sulphur-containing, the gold mine of process containing Au10-20g/t, sulfur-bearing 4%-20%,
Iron content 20%-30%, containing arsenic 0.5%-18%, carbonate 5%-10%, cupric≤0.8%, gold more than 80% cures thing parcel；Its feature
It is:--Gold Leaching In Thiourea Solutions technique, concrete operation step and technological parameter are such as hot-pressure oxidation--1 grade dense--to use gold mine pre-acidified
Under:
(1), gold (smart) ore deposit carry out wet ball-milling, being milled to granularity-0.074mm is 94%-98%；
(2), the ore pulp mass concentration after ball milling carries out pre-acidified, to remove the carbonate in Ore after being adjusted to 15%-30%；
(3), after acidifying, ore pulp carries out hot-pressure oxidation, hot pressing temperature 200-220 DEG C, oxygen partial pressure 0.5-0.8Mpa, sulfur oxidation rate
96.5%-99.5%, sulfur acid 20-45g/L in oxidation solution, containing Fe3+4-16g/L, containing Fe2+ 0-2.5g/L；
(4), oxidation after ore pulp carry out dense, thickened underflow ore pulp mass concentration 40%-45%, overflowing liquid return pre-acidified work
Sequence, acid elution rate 60%-70%；
(5), thickened underflow add clear water and size mixing to ore pulp mass concentration 25%-30%, control the Fe in liquid phase3+Concentration 0.5-8g/L,
Sulfuric acid concentration 2-15g/L；
(6), adding thiourea and carry out acidic leaching, the thiourea concentration controlled in liquid phase is 1 ‰-4.8 ‰, fills air stirring, stirring
Linear velocity 2.5-4.2m/s, aeration quantity 4-8Nm/(h), extraction time 10-16 hour；
(7), filtration washing, tailings removes Tailings Dam, and your liquid reclaims gold, and lean solution is sized mixing before returning leaching gold after supplementing thiourea.
The hot pressing recovery method of the difficult gold mine of a kind of arsenic-containing sulphur-containing the most as claimed in claim 1, is characterized in that: described (2nd)
By adding sulphuric acid realization when step pre-acidified is to start, returned by the overflow oxidation solution of (4th) the dense operation of step after normal operation
Being main, sulphuric acid is as supplementing.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106929671A (en) * | 2017-05-03 | 2017-07-07 | 中南大学 | A kind of method and device for controlling current potential reinforcing leaching gold |
| CN107815554A (en) * | 2017-09-30 | 2018-03-20 | 紫金矿业集团股份有限公司 | The gold extracting method of high antimony golden ore concentrate hard to treat containing arsenic |
| CN107881342A (en) * | 2017-10-27 | 2018-04-06 | 紫金矿业集团股份有限公司 | The method of comprehensive utilization of iron ion in arsenic-containing gold ore pressureleaching solution |
| CN109022775A (en) * | 2018-06-27 | 2018-12-18 | 昆明理工大学 | A kind of high-speed rail Gold Concentrate under Normal Pressure acid thiourea extract technology |
| CN110904335A (en) * | 2019-11-22 | 2020-03-24 | 厦门紫金矿冶技术有限公司 | Method for improving silver leaching rate of pressure oxidation slag of silver-containing gold concentrate difficult to treat |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106929671A (en) * | 2017-05-03 | 2017-07-07 | 中南大学 | A kind of method and device for controlling current potential reinforcing leaching gold |
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| CN107881342A (en) * | 2017-10-27 | 2018-04-06 | 紫金矿业集团股份有限公司 | The method of comprehensive utilization of iron ion in arsenic-containing gold ore pressureleaching solution |
| CN109022775A (en) * | 2018-06-27 | 2018-12-18 | 昆明理工大学 | A kind of high-speed rail Gold Concentrate under Normal Pressure acid thiourea extract technology |
| CN110904335A (en) * | 2019-11-22 | 2020-03-24 | 厦门紫金矿冶技术有限公司 | Method for improving silver leaching rate of pressure oxidation slag of silver-containing gold concentrate difficult to treat |
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