CN105671334A - Method for extracting gold from roasted product - Google Patents
Method for extracting gold from roasted product Download PDFInfo
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- CN105671334A CN105671334A CN201610130446.5A CN201610130446A CN105671334A CN 105671334 A CN105671334 A CN 105671334A CN 201610130446 A CN201610130446 A CN 201610130446A CN 105671334 A CN105671334 A CN 105671334A
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- gold
- leaching
- alkali
- calcining
- slag
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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
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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
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
- C22B1/06—Sulfating roasting
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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
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/04—Extraction of metal compounds from ores or concentrates by wet processes by leaching
- C22B3/12—Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic alkaline solutions
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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
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- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Inorganic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a method for extracting gold from a roasted product. In the roasting process of a gold concentrate, secondary enclosing of gold by iron oxides and silicate is inevitably generated, and consequently, the subsequent chemical gold leaching process is blocked. According to the method for extracting the gold from the roasted product, the roasted product obtained through roasting of the gold concentrate is subjected to size grading firstly, and is screened into a coarse fraction and a fine fraction; and then the roasted product is subjected to alkaline leaching and sulphuric acid curing roasting-washing. Through the method, the leaching rate of gold in the roasted product can be obviously improved, and the gold leaching rate of the roasted product can reach more than 90%; and the method is simple and easy to operate, selectiveness and targeting of pretreatment of enclosed gold in the roasted product before gold leaching can be obviously enhanced, and therefore different types of enclosed gold can be effectively opened, the treatment amount and energy consumption of a pretreatment working procedure can be reduced, and the important theory and technical guidance is provided for effective gold extracting of the gold roasted product.
Description
Technical field
The invention belongs to fire method-wet method combined field of metallurgy, it is specifically related to a kind of method extracting gold from calcining.
Background technology
Along with easily selecting the day by day exhausted of gold ore resource, difficult-treating gold mine becomes the main raw material of golden production. At present, difficult-treating gold mine accounts for more than the 60% of world's gold reserve, but due to utilization ratio low, its gold output less than the world gold ultimate production 10%. The treatment process reclaiming the gold employing in difficult-treating gold mine mainly contains roasting oxidation method, pressure oxidation method and biological oxidation process. Oxidizing roasting method is generally used for the gold mine containing carbonaceous, can the material that leaching gold is harmful such as effective elimination sulphur, arsenic, carbon in oxidizing roasting process, but due to roasting process, always inevitable real estate pig iron oxide compound and silicate, to the secondary capsulation of gold, so often make the gold leaching rate after roasting less than 80%. Therefore, urgently need to research and develop new Method and Technology and such refractory gold ore is carried out more fully extracting and reclaiming of gold, and then improve the utilization ratio of gold ore resource.
Patent " the intensified acid dissolution method (application number is CN200410067020) of a kind of gold ores containing sulfur acidizing fired slags ", " acid-soluble method (application number CN201210200258.7) is strengthened in a kind of sulfur containing aurin ore-roasting reducing roasting " and " a kind of strengthening puies forward golden method (application number CN201210516412.1) containing sulphur arsenic iron gold ore calcining " etc. are all under acidic medium, calcining is processed, but aforesaid method is same or the problem that gold leaching rate is low.
Summary of the invention
Putting forward, for current calcining, the problem that in gold process, trapping gold can not be extracted efficiently, it is an object of the invention to provide a kind of method extracting gold from calcining, not only cost is low for the method, and can significantly improve the leaching yield of gold.
In order to realize above-mentioned purpose, the present invention provides a kind of method extracting gold from calcining.
Its technical scheme is: gold concentrate roasting gained calcining is carried out size classification, sieves as thick, fine fraction, and coarse fraction calcining is carried out ore grinding so that it is granularity reaches-44 μm and accounts for more than 90%;Then, coarse fraction calcining is carried out alkali leaching, fine fraction calcining is then carried out sulfuric acid slaking roasting-washing; Finally, alkali is soaked slag and washing slag mix by a certain percentage carry out chemistry leaching gold.
In described method, gained calcining after gold concentrate roasting being carried out size classification, sieve as thick, fine fraction, described thickness grade screening boundary should be determined between 37-44 μm.
Carrying out alkali leaching to after coarse fraction calcining ore grinding in described method, alkali leaching NaOH consumption is the 1.5-3% of this part calcining massfraction, and extraction temperature is 80-100 DEG C, and extraction time is 0.5-2h.
In described method, the temperature that fine fraction calcining carries out sulfuric acid slaking roasting is 80-400 DEG C, and the maturation process time is 0.5-2h, and wherein the coefficient of excess of sulfuric acid is 1.5-4.0, and slaking calcining is washed, and the separation of slag liquid.
In described method, adding calcium oxide adjustment pH and carry out chemistry leaching gold after alkali soaks slag and washing slag mixing, pH scope is 10-11.5, and alkali soaks the mixing quality of slag and washing slag than being 1:5～3:2, and leaching liquid-solid ratio is 3:1～2:1.
The elements such as a large amount of silicon in gold concentrate roasting process coarse fraction gold mine, calcium, magnesium, aluminium easily form silicate, cause the blocking of ferriferous oxide pore texture, and namely silicate is to the parcel of gold; And roasting easily occurred fine fraction gold ore in roasting process, directly cause ferriferous oxide to the secondary capsulation of gold. The parcel of above-mentioned two kinds of materials further increases the difficulty leaching gold.
Carrying with existing strengthening calcining compared with golden technology, the useful effect of the present invention comprises:
In alkali leaching slag, alkali content is still higher, and the slaking slag after washing exists lower acidity, the two mixing is sized mixing, it is not necessary to exogenously added alkali, so that it may meet leaching gold system to the requirement of pH. Greatly reduce the cost of the present invention. Significantly reduce the consumption of alkali in leaching gold system.
After size classification, meet the fine fraction calcining of chemistry leaching lsp request (-44 μm account for more than 90%), without the need to regrinding, thus decrease the treatment capacity of ore grinding, reduce energy consumption, and make unlikely meticulous, the argillization of calcining granularity and affect follow-up leaching gold process.
The present invention, by calcining is carried out size classification process, significantly improves the leaching gold rate of calcining, makes the leaching yield of gold reach more than 90%.
In the prior art, having, by oxidation and acidleach, calcining is carried out the technique of bulk treatment, but contriver finds that its process effect is not good, the leaching yield of the gold obtained is not high, it is difficult to obtain the good recovering effect corresponding to cost. And in calcining roasting process; the oxide compounds such as silicon easily form silicate; the hole that blocking ferriferous oxide is formed; and roasting also usually can be there is in ferriferous oxide; therefore gold all can be produced secondary capsulation with the ferriferous oxide crossing roasting by silicate; process of the prior art all can not open the parcel of gold completely, so that gold can not fully and effectively reclaim. For above-mentioned present situation, contriver is by once attempting unexpectedly, and by first being sieved by calcining, and by strict limitation thickness grading, the follow-up effective process separately carrying out alkali leaching and acidleach, substantially increases the leaching yield of gold in calcining. Prior art never adopted the method being similar to the present invention, the fractionation of each step of the present invention seems simple, but in fact to those skilled in the art, the design of the present invention is very cleverly, scheme also is very difficult to expect, the effect obtained also is that those skilled in the art are difficult to expect to obtain.
The inventive method is simple to operation, before can obviously strengthening leaching gold, trapping gold in calcining is carried out pretreated selectivity and specific aim, and then effectively open dissimilar trapping gold and reduce treatment capacity and the energy consumption of pretreatment process, the leaching yield of gold can be significantly improved, for the gold of effectively carrying of gold mine calcining provides important theory and technical director simultaneously.
Accompanying drawing explanation
Fig. 1 is the Technology Roadmap of the present invention.
Embodiment
It is intended to illustrate further the present invention below in conjunction with embodiment, and unrestricted the present invention.
Material condition:
Sample ore: gold calcining, Gold grade 22.50g/t, containing Fe25.44%, S1.83%, SiO234.61%, wherein, iron is mainly with Fe2O3Form exists. Table 1 is the relation of gold calcining grade and principal element content.
The content (by 37 μm of classifications) of each grain size content of table 1 gold calcining and principal element thereof
Alkali leaching condition is: NaOH mass concentration 2%, temperature 80 DEG C, liquid-solid ratio 3:1, stirring velocity 300rpm, extraction time 1h.
Sulfuric acid slaking roasting condition is: H2SO4Mass concentration 75%, temperature 100 DEG C, sulfuric acid coefficient of excess 4.0, curing time 1h.
Gold leaching condition: liquid-solid ratio 2.5:1, pH11, NaCN mass concentration 0.4%, mixing speed 600rpm, extraction time 36h;
Comparative example 1: the direct cyaniding of above-mentioned calcining being leached, the leaching yield of gold is 70.33%;
Comparative example 2: thick, fine fraction calcining direct cyaniding leaching respectively, the leaching yield of gold is respectively coarse fraction 80.49%, fine fraction 59.70%;
Comparative example 3: after calcining alkaline pretreatment, cyaniding is leached, and the leaching yield of gold is 83.22%;
Comparative example 4: calcining does not sieve, after direct sulfuric acid slaking roasting-washing, cyaniding is leached, and the leaching yield of gold is 86.40%;
Comparative example 5: after thick, fine fraction calcining are distinguished alkaline pretreatment, cyaniding is leached, and the leaching yield of gold is respectively coarse fraction 93.92%, fine fraction 74.00%;
Comparative example 6: after thick, fine fraction calcining are distinguished sulfuric acid slaking roasting-washing, cyaniding is leached, and the leaching yield of gold is respectively coarse fraction 82.48%, fine fraction 96.39%;
Comparative example 7: fine fraction is carried out alkali leaching, after coarse fraction carries out sulfuric acid slaking roasting-washing, cyaniding is leached, the leaching yield 76.18% of gold;
Embodiment 1: coarse fraction calcining is carried out alkali leaching, and fine fraction calcining carries out sulfuric acid slaking roasting-washing, then alkali soaks slag, and slag mixes even with 1:3.5 with washing, cyaniding is leached, and the leaching yield of gold is 92.14%.
Embodiment 2: coarse fraction calcining is carried out alkali leaching, and fine fraction calcining carries out sulfuric acid slaking roasting-washing, then alkali soaks slag, and slag mixes even with 1:4 with washing, cyaniding is leached, and the leaching yield of gold is 94.89%.
Embodiment 3: coarse fraction calcining is carried out alkali leaching, and fine fraction calcining carries out sulfuric acid slaking roasting-washing, then alkali soaks slag, and slag mixes even with 1:5 with washing, cyaniding is leached, and the leaching yield of gold is 95.44%.
The content (by 44 μm of classifications) of each grain size content of table 2 gold calcining and principal element thereof
Embodiment 4: gold calcining is carried out classification by table 2, coarse fraction calcining is carried out alkali leaching, and fine fraction calcining carries out sulfuric acid slaking roasting-washing, then alkali soaks slag, and slag mixes even with 1:5 with washing, cyaniding is leached, and the leaching yield of gold is 93.16%.
In sum, by by the contrast of comparative example 1-7 and embodiment it will be seen that the effect of the present invention is far superior to comparative example, the leaching yield of embodiment 1 gained gold is up to more than 90%.
Although described the present invention above in conjunction with the embodiments, but those of ordinary skill in the art are not it should be appreciated that when departing from spirit and the scope of claim, it is possible to above-described embodiment is carried out various amendment.
Claims (10)
1. one kind is extracted the method for gold from calcining, it is characterised in that, it is thick, fine fraction by the screening of gold concentrate roasting gained calcining, coarse fraction calcining is carried out ore grinding, the particle of its granularity-44 μm is accounted for and after more than 90%, carries out alkali leaching, slag liquid separation after alkali leaching, obtain alkali leaching slag; Fine fraction calcining carries out sulfuric acid slaking roasting-washing, and slag liquid is separated, and obtains washing slag; Further alkali is soaked slag and washes slag mixing and carry out chemistry leaching gold;
Wherein, slightly, a some value between being 37-44 μm of demarcating of fine fraction.
2. method according to claim 1, it is characterised in that, the dipped journey of alkali uses NaOH or KOH, its consumption is the 1.5%-3% of calcining quality in the dipped journey of alkali.
3. method according to claim 1 and 2, it is characterised in that, the extraction temperature in the dipped journey of alkali is 80-100 DEG C.
4. method according to claim 1, it is characterised in that, the temperature of sulfuric acid slaking roasting is 80-400 DEG C.
5. method according to claim 1 or 4, it is characterised in that, in sulfuric acid slaking roasting process, the coefficient of excess of sulfuric acid is 1.5-4.0.
6. method according to claim 3, it is characterised in that, the extraction time in the dipped journey of alkali is 0.5-2h.
7. method according to claim 5, it is characterised in that, the sulfuric acid maturation process time is 0.5-2h.
8. method according to claim 1, it is characterised in that, adding calcium oxide adjustment pH after alkali soaks slag and washing slag mixing is that 10-11.5 carries out chemistry leaching gold.
9. method according to claim 1 or 8, it is characterised in that, the mixing quality of alkali leaching slag and washing slag is than being 1:5～3:2.
10. method according to claim 1 and 2, it is characterised in that, the liquid-solid ratio in the dipped journey of alkali is 3:1～2:1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610130446.5A CN105671334B (en) | 2016-03-09 | 2016-03-09 | A kind of method that gold is extracted from calcining |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610130446.5A CN105671334B (en) | 2016-03-09 | 2016-03-09 | A kind of method that gold is extracted from calcining |
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| CN105671334A true CN105671334A (en) | 2016-06-15 |
| CN105671334B CN105671334B (en) | 2017-06-30 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB833718A (en) * | 1956-07-03 | 1960-04-27 | Lakefield Res Of Canada Ltd | Process for extracting gold |
| CN1614041A (en) * | 2004-10-11 | 2005-05-11 | 东华大学 | Enhanced acid dissolve of acidizing fired slags of concentrated gold ores containing sulfur |
| 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 |
| CN103122415A (en) * | 2013-03-13 | 2013-05-29 | 山东乾舜矿冶科技股份有限公司 | Method for improving inclusion gold leaching rate |
| CN104694764A (en) * | 2015-03-09 | 2015-06-10 | 中南大学 | Reinforced leaching method of fine-grained encapsulated gold |
-
2016
- 2016-03-09 CN CN201610130446.5A patent/CN105671334B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB833718A (en) * | 1956-07-03 | 1960-04-27 | Lakefield Res Of Canada Ltd | Process for extracting gold |
| CN1614041A (en) * | 2004-10-11 | 2005-05-11 | 东华大学 | Enhanced acid dissolve of acidizing fired slags of concentrated gold ores containing sulfur |
| 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 |
| CN103122415A (en) * | 2013-03-13 | 2013-05-29 | 山东乾舜矿冶科技股份有限公司 | Method for improving inclusion gold leaching rate |
| CN104694764A (en) * | 2015-03-09 | 2015-06-10 | 中南大学 | Reinforced leaching method of fine-grained encapsulated gold |
Non-Patent Citations (1)
| Title |
|---|
| 杨永斌等: "高硫砷金矿焙砂的硫酸熟化法预处理", 《中国有色金属学报》 * |
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