CN113088720A - Efficient pretreatment method for refractory metallurgical ore - Google Patents
Efficient pretreatment method for refractory metallurgical ore Download PDFInfo
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- CN113088720A CN113088720A CN202110371681.2A CN202110371681A CN113088720A CN 113088720 A CN113088720 A CN 113088720A CN 202110371681 A CN202110371681 A CN 202110371681A CN 113088720 A CN113088720 A CN 113088720A
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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
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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
- C22B11/08—Obtaining noble metals by cyaniding
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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
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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
- C22B3/06—Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic acid solutions, e.g. with acids generated in situ; in inorganic salt solutions other than ammonium salt solutions
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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
- C22B3/20—Treatment or purification of solutions, e.g. obtained by leaching
- C22B3/44—Treatment or purification of solutions, e.g. obtained by leaching by chemical processes
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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
A method for efficiently pretreating refractory metallurgical ore comprises the steps of adding water into the refractory metallurgical ore, pulping, adding a dispersing agent, carrying out mechanical activation, and grinding until 90% of particles in mass percentage are smaller than 1-20 mu m, so that the chemical reaction activity of the refractory metallurgical ore is increased; adding an oxidant into the mechanically activated system for pre-oxidation, dissolving associated minerals wrapping the gold to expose the gold, and filtering after pre-oxidation; and (4) mixing the filter cake obtained by filtering into slurry, leaching and extracting gold, and recovering gold and silver in the gold. The invention adopts mechanical activation and chemical pre-oxidation, reduces the difficulty of the oxidation reaction of the mineral coated on the refractory gold ore, can be carried out at normal temperature and normal pressure, reduces the equipment investment and the operation cost, does not generate harmful gas and waste residue, is environment-friendly, is easy to manufacture in large scale, can realize large-scale production and application, and has great popularization value.
Description
Technical Field
The invention belongs to the technical field of metallurgy, relates to gold and silver ore smelting, and particularly relates to an efficient pretreatment method for refractory metallurgical ore.
Background
The gold in the refractory metallurgical ore is wrapped in the associated minerals in the form of micron-sized micro-particles, and the wrapping is required to be opened to expose the gold for recovering the part of gold.
There are three commonly used pretreatment processes:
the first is pressure thermal oxidation, and under the condition of high temperature and high pressure, oxygen is filled in to dissolve associated minerals wrapping gold, so that the gold is exposed. Namely, chemical reaction which is difficult to be carried out under normal pressure is carried out under the conditions of high temperature, high pressure and oxygen, acid or alkali is added to decompose sulfur and arsenic minerals wrapping gold in the ore, and the gold is exposed, thereby providing conditions for next cyaniding leaching.
Mclaighlicn gold ore of Homestake company in 1985 is treated by the pressure thermal oxidation method to refractory gold ore containing arsenic and sulfur, and thus the pressure thermal oxidation method becomes an important pretreatment process of refractory gold ore.
The general process conditions for the autoclave oxidation of gold are as follows: the temperature is 180-200 ℃, the pressure is 2-3 MPa, the PH is 0.5-1.5, the oxidation time is 2-3 h, the oxidation rate of sulfur and arsenic is more than 50%, the leaching rate of gold after pretreatment is more than 95%, and the operation cost is about 1000-1500 yuan/t.
The pretreatment method has the following advantages: (1) the oxidation product is soluble, and the reaction is thoroughly decomposed; (2) no harmful gas is generated, and the method is environment-friendly; (3) both raw ore and concentrate can be treated, and the method is suitable for building large-scale gold extraction plants; the disadvantages are that: (1) because high temperature and high pressure are accompanied by strong corrosion, the requirements on equipment and materials are high, and potential safety hazards exist; (2) the operation and maintenance costs are high; (3) the investment is large.
The second is biological oxidation, the biological oxidation pretreatment method is a novel process which is researched in the last 80 th century, and mainly comprises the steps of adding bacteria into prepared ore pulp, and oxidizing and decomposing pyrite, arsenopyrite and other sulfide minerals wrapping gold by using the action of leaching bacteria and metabolite ferric sulfate thereof, so that gold particles are exposed, and the cyaniding leaching rate is improved. Although the biological oxidation process is a relatively new process, the biological oxidation process is the most rapidly developed process in China. In 2000, the first domestic bacterial oxidation pretreatment process gold extraction demonstration plant with the scale of 50t/d was successfully built by the gold smelting plant on the smoke bench.
The general process conditions for the biological oxidation of gold are as follows: the concentration of the ore pulp is 18-20%, the temperature is 45-46 ℃, the pH value is 1.0-1.3, the slag yield is 50-60%, and the pre-oxidation time is 6-15 days. The medicament such as dipotassium phosphate, caustic soda, ammonium sulfate and the like is used as a bacteria culture medium, and the pH value of ore pulp is adjusted to ensure the living environment of bacteria. The oxidation rate of the sulfur and the arsenic is more than 50%, the leaching rate of the pretreated gold is more than 94%, and the operation cost is about 1000-1200 yuan/t.
The pretreatment technology has the following advantages: the method is relatively friendly and safe to the environment, is simple to operate, and is suitable for building a small-scale factory in the gold mine with mines. The disadvantages are that: the treatment speed is slow, the oxidation time is long, the metal quantity of the system stock is too large, the capital occupation is large, the equipment investment is large, the ore pulp concentration is low, the equipment needs anti-corrosion treatment, bacteria have temperature resistance requirements, the adaptability is poor, the raw material adaptability is weak, and the like.
The third is two-stage roasting, the roasting oxidation pretreatment method is to oxidize and decompose the arsenic sulfide ore and carbide wrapping the gold by air or artificially added oxygen at high temperature, and simultaneously generate a large amount of cracks to expose the wrapped gold, which is the most traditional and effective oxidation pretreatment technology.
The general process conditions for two-stage roasting of gold are as follows: and (3) carrying out anoxic roasting on the first-stage roasting furnace at 570-670 ℃, carrying out acid roasting on the second-stage roasting furnace, wherein the oxygen excess coefficient is 0.8, the raw material fed into the furnace contains 4% of arsenic, the arsenic removal rate is generally 90%, and the recovery rate of gold is about 85% -90%. The operation cost is about 800-1200 Yuan/t.
However, one-stage roasting cannot be used for arsenopyrite because in the case of excess oxygen, iron in the raw material will form ferric oxide, arsenic will form ferric arsenate, which will be fixed in ferric oxide to form a new coating for gold. Thereby inhibiting extraction of gold. The two-stage roasting is to perform anoxic roasting in the first stage roasting furnace to make iron in the raw materials generate ferroferric oxide and arsenic generate arsenic trioxide, so that arsenic and sulfur enter a gas phase, and the aim of removing the arsenic and sulfur is fulfilled. And carrying out sulfatizing roasting in a second stage furnace so as to comprehensively recover valuable metals in the ores. In 2003, the first two-stage roasting system in China was built by the large group in Shandong, and the processing capacity is 200 t/d.
The pretreatment technology has the following advantages: has high processing speed and strong adaptability (being suitable for refractory gold ores containing sulfur, arsenic and carbon); the by-product can be recycled; reliable technology and simple operation. The disadvantages are that: a large amount of SO is released in the roasting process2And As2O3And the like, and the pollution is large; the environment-friendly degree is poor, the process requirement is strict, and the pretreatment effect is poor; the technological process is long and complex, the investment is large, the production cost is high, and the recovery rate of gold is lower than that of the former two technologies.
Disclosure of Invention
In order to overcome the defects of harsh pre-oxidation conditions, long operation period, unfriendly environment, large equipment investment and the like in the prior art, the invention aims to provide the high-efficiency pretreatment method for the refractory metallurgical ores, which adopts mechanical activation and chemical pre-oxidation to reduce the difficulty of oxidation reaction of the coated ores of the refractory ores, so that the refractory ores can be carried out at normal temperature and normal pressure, the equipment investment and operation cost are reduced, harmful gas and waste residues are not generated, the environment is friendly, the equipment is easy to manufacture in a large scale, the large-scale production and application can be realized, and the method has great popularization value.
In order to achieve the purpose, the invention adopts the technical scheme that:
a high-efficiency pretreatment method for refractory metallurgical ore comprises the following steps:
adding water into refractory metallurgical ore, pulping, adding a dispersing agent, performing mechanical activation, and grinding until 90% of particles in mass percentage are smaller than 1-20 microns (namely D90 is smaller than 1-20 microns), so that the chemical reaction activity of the refractory metallurgical ore is increased;
adding an oxidant into the mechanically activated system for pre-oxidation, dissolving associated minerals wrapping the gold to expose the gold, and filtering after pre-oxidation;
and step three, mixing the filtered filter cake, leaching and extracting gold, and recovering gold and silver in the filter cake.
Further, the refractory metallurgical ore is gold ore or gold concentrate containing one or more of arsenic, carbon and micro-fine particle leached gold, and the associated minerals are arsenopyrite and/or pyrite.
Further, the mechanical activation conditions are as follows:
solid-liquid ratio: 1, (1-10);
grinding time: 0.01-5 hours;
grinding temperature: 10-100 ℃;
granularity of ore grinding medium: <5 mm;
the dosage of the dispersant is as follows: 1-100 kg/t ore.
Further, the dispersing agent is sodium hexametaphosphate and/or water glass.
Further, in the second step, a part of filtrate obtained by filtering returns to mechanical activation pulp mixing, and the other part of filtrate is treated and discharged after reaching the standard.
Further, in the second step, NaOH is added at the same time of adding the oxidant to precipitate the iron ions produced by the oxidation reaction.
Further, the pre-oxidation conditions are as follows:
solid-liquid ratio: 1, (1-10);
oxidation leaching time: 0.1-20 hours (along with the change of ore properties, the time span change is large, preferably 20 minutes-16 hours);
oxidation leaching temperature: 10-100 ℃, and can be further selected to be 10-50 ℃;
the amount of NaOH used is as follows: 1-100 kg/t ore;
addition amount of an oxidizing agent: 1-5000 mol/t ore.
Further, the oxidant is hydrogen peroxide, potassium permanganate or ozone.
Further, gold extraction is carried out through cyanidation, gold and silver are recovered through a carbon pulp method or a displacement method after leaching is finished, leached tailings are filtered, filter cakes are discharged, and filtrate is returned to the step for size mixing.
Further, the solid-liquid ratio in the gold extraction by leaching is 1 (1-5), NaCN or an environment-friendly gold extraction agent is added according to the proportion of 0.001-50 g/L, air is filled for cyaniding leaching, and the leaching time is 0.1-80 hours.
Compared with the prior art, the invention utilizes the principle that the solid mineral can generate plastic deformation and various defects after being acted by mechanical force, the internal energy is increased, the chemical reaction activity is increased, the reaction which can not occur under the conventional condition can be realized, the reaction speed is greatly accelerated, and the mineral is finely ground until the mass percent is less than 90 percent and the specific surface area is more than 1000m2And/kg, the associated minerals wrapping the gold can be dissolved by adding the oxidant without high temperature and high pressure even at normal temperature and normal pressure, so that the gold is exposed, and the high-efficiency recovery of the gold is realized.
The internal verification shows that the recovery rate of gold and silver in the refractory gold ore is more than 90 percent by adopting the method, and is improved by 40 percent compared with the conventional cyaniding method, in addition, the production cost is about 600 yuan/ton by adopting the method, and compared with the biological oxidation, two-stage roasting and conventional autoclave oxidation processes, the method can reduce the investment, reduce the production cost, improve the recovery rate, reduce the environmental pollution and has obvious economic and social benefits.
In conclusion, the method has the advantages of simple process, good mineral adaptability, low investment, low operation cost, environmental friendliness and the like.
Drawings
FIG. 1 is a schematic flow diagram of the present invention.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the drawings and examples.
As shown in figure 1, the high-efficiency pretreatment method of the refractory metallurgical ore is suitable for treating arsenic-containing, carbon-containing and micro-particle-containing leached gold ore or gold concentrate, and comprises three steps of mechanical activation, pre-oxidation and leaching, namely: carrying out superfine grinding on refractory metallurgical ore to increase the chemical reaction activity of the ore; adding oxidant to decompose arsenopyrite, pyrite and the like wrapping the gold mineral, so that the gold and silver are fully exposed; and recovering gold and silver in the oxidation slag by a cyanidation method or other cyanide-free leaching. The specific steps of the invention are described as follows:
step 1: adding water into refractory metallurgical ore to prepare ore pulp with a solid-liquid mass ratio of 1 (1-10), adding dispersing agents such as sodium hexametaphosphate or water glass, carrying out superfine grinding until the mass percentage of 90% is less than 1-20 mu m (D90 is less than 1-20 mu m), and entering the step 2;
step 2: adding an oxidant such as hydrogen peroxide, potassium permanganate, ozone and the like into the ore pulp obtained in the step 1 in an oxidation tank for oxidation leaching. Simultaneously, NaOH can be added according to the requirement to precipitate iron ions produced by the oxidation reaction. And (3) after leaching is finished, returning part of liquid obtained by filtering the ore pulp to the step 1 for size mixing, and neutralizing the other part of liquid to reach the standard and discharging. And (3) feeding a solid filter cake obtained after filtration into the step 3.
And step 3: oxidizing the filter cake of the leaching residue, adding cyanide leached return water for size mixing, simultaneously adding NaCN or an environment-friendly gold extraction agent according to the requirement, and charging air for cyanide leaching for 0.1-80 hours; and recovering gold and silver by a carbon pulp method or a replacement method after leaching is finished. The leached tailings are filtered, filter cakes are discharged, and filtrate returns to the operation for size mixing.
The specific operating conditions were as follows:
mechanical activation:
solid-liquid ratio: 1 (1 to 10)
Grinding time: 0.01 to 5 hours
Grinding temperature: 10 to 100 DEG C
Granularity of ore grinding medium: <5mm
The product fineness is as follows: (1 to 20 μm) accounts for 90% (D90<1 to 20 μm)
The dosage of the dispersant is as follows: 1-100 kg/t ore
② pre-oxidation
Solid-liquid ratio: 1 (1 to 10)
Oxidation leaching time: 0.1 to 20 hours
Oxidation leaching temperature: 10 to 100 DEG C
The amount of NaOH (if any): 1 to 100kg/t ore
Addition amount of an oxidizing agent: 1-5000 mol/t ore
③ cyaniding to extract gold and silver
Solid-liquid ratio: 1 (1 to 5)
Leaching time: 0.1 to 80 hours
NaCN or environment-friendly gold extraction agent (if present): 0.001 to 50 g/L.
The principle of the invention comprises:
after the solid mineral is subjected to mechanical force, plastic deformation and various defects can be generated, the internal energy is increased, and the chemical reaction activity is increased; meanwhile, with the increase of the surface area, the physical and chemical properties of the material are greatly changed, the reaction which cannot occur under the conventional condition can be realized, and the reaction speed is greatly accelerated. The invention can destroy the gold inclusion by using mechanical activation and preoxidation, thereby facilitating the subsequent gold extraction by leaching.
The following are several specific embodiments of the invention:
example 1
The chemical composition of 1t gold concentrate for treating a certain mine in Gansu is shown in the following table:
the gold leaching rate of the direct cyanidation treatment of the gold concentrate is 45 percent, and the leaching rate of the cyanidation gold after roasting is 80 percent; the sale price is lower, and the economic benefit is poorer.
Step 1: adding water into raw materials to prepare ore pulp with the solid-liquid mass ratio of 1:1.5, adding 10kg/t of sodium hexametaphosphate, finely grinding until the particle size is-5 mu m and accounts for 90 percent (mass ratio), and entering the step 2;
step 2: adding water into the ore pulp obtained in the step 1 to dilute the ore pulp until the solid-liquid mass ratio is 1:3, adding 5kg/t of 30% hydrogen peroxide and 8kg/t of 99% industrial caustic soda, and carrying out oxidation leaching for 6 hours. And (3) after leaching is finished, returning part of liquid obtained by filtering the ore pulp to the step 1 for size mixing, and neutralizing the other part of liquid to reach the standard and discharging. The solid obtained after filtration is taken to step 3.
And step 3: adding a filter cake obtained by filtering the oxidized leached tailings, adding backwater obtained by cyaniding leaching for size mixing, simultaneously adding NaCN10kg/t, and charging air for cyaniding leaching for 48 hours; and simultaneously adding the gold and silver in the activated carbon adsorption solution. Finally, the produced gold-loaded carbon is replaced to produce 50kg of gold mud, the gold content is 865g/t, the silver content is 859, the gold recovery rate is 91.39%, and the silver recovery rate is 68.58%; the leached tailings are filtered, filter cakes are discharged, and filtrate returns to the operation for size mixing.
Examples 2,
100kg of gold concentrate of a Gilgis mine is treated, and the chemical components of the gold concentrate are shown in the following table:
the gold concentrate is subjected to direct cyanidation treatment, the gold leaching rate is 27 percent, and the gold cyanide leaching rate after roasting is 78 percent; the valuation coefficient of the sale price is 70 percent, and the economic benefit is poor.
Step 1: adding water into raw materials to prepare ore pulp with the solid-liquid mass ratio of 1:1.5, adding 10kg/t of sodium hexametaphosphate, finely grinding until the particle size is-5 mu m and accounts for 90 percent (mass ratio), and entering the step 2;
step 2: adding water into the ore pulp obtained in the step 1 to dilute the ore pulp until the solid-liquid mass ratio is 1:3, adding 12kg/t of ozone and 15kg/t of 99% industrial caustic soda, and carrying out oxidation leaching for 6 hours at normal temperature and normal pressure. And (3) after leaching is finished, returning part of liquid obtained by filtering the ore pulp to the step 1 for size mixing, and neutralizing the other part of liquid to reach the standard and discharging. The solid obtained after filtration is taken to step 3.
And step 3: adding a filter cake obtained by filtering the oxidized leached tailings, adding backwater for cyaniding leaching for size mixing, simultaneously adding 60kg/t of low-toxicity environment-friendly gold extracting agent, and charging air for cyaniding leaching for 48 hours; and simultaneously adding the gold and silver in the activated carbon adsorption solution. 5kg of gold-loaded carbon, 409g/t of gold and 402g/t of silver are finally produced, the gold recovery rate is 93.78 percent, and the silver recovery rate is 61.25 percent; the leached tailings are filtered, filter cakes are discharged, and filtrate returns to the operation for size mixing.
Examples 3,
100kg of Peru mine gold concentrate is treated, and the chemical components are shown in the following table:
the gold concentrate is directly cyanided to treat the gold leaching rate of 21 percent, and the gold cyanide leaching rate after roasting in a smelting plant is 62 percent.
Step 1: adding water into raw materials to prepare ore pulp with the solid-liquid mass ratio of 1:1.5, adding 15kg/t of sodium hexametaphosphate, finely grinding until the particle size is-2.5 mu m and accounts for 90 percent (mass ratio), and entering the step 2;
step 2: adding water into the ore pulp obtained in the step 1 to dilute the ore pulp until the solid-liquid mass ratio is 1:3, adding 21kg/t of ozone and 5kg/t of 99% industrial caustic soda, and carrying out oxidation leaching for 12 hours at normal temperature and normal pressure. And (3) after leaching is finished, returning part of liquid obtained by filtering the ore pulp to the step 1 for size mixing, and neutralizing the other part of liquid to reach the standard and discharging. The solid obtained after filtration is taken to step 3.
And step 3: adding a filter cake obtained by filtering the oxidized leached tailings, adding backwater for cyaniding leaching for size mixing, simultaneously adding 60kg/t of low-toxicity environment-friendly gold extracting agent, and charging air for cyaniding leaching for 48 hours; and simultaneously adding the gold and silver in the activated carbon adsorption solution. 5kg of gold-loaded carbon, 998g/t of gold, 1647g/t of silver, 85.62% of gold recovery rate and 65.25% of silver recovery rate are finally produced; the leached tailings are filtered, filter cakes are discharged, and filtrate returns to the operation for size mixing.
Claims (10)
1. A high-efficiency pretreatment method for refractory metallurgical ore is characterized by comprising the following steps:
adding water into refractory metallurgical ore for size mixing, adding a dispersing agent for mechanical activation, and grinding until 90% of particles in mass percentage are smaller than 1-20 mu m, so that the chemical reaction activity of the refractory metallurgical ore is increased;
adding an oxidant into the mechanically activated system for pre-oxidation, dissolving associated minerals wrapping the gold to expose the gold, and filtering after pre-oxidation;
and step three, mixing the filtered filter cake, leaching and extracting gold, and recovering gold and silver in the filter cake.
2. The method for the efficient pretreatment of refractory metal ore according to claim 1, wherein said refractory metal ore is gold ore or gold concentrate containing one or more of arsenic, carbon and fine-grained immersion gold, and said associated minerals are arsenopyrite and/or pyrite.
3. A method for the efficient pretreatment of refractory metallurgical ore according to claim 1, wherein said mechanical activation conditions are as follows:
solid-liquid ratio: 1, (1-10);
grinding time: 0.01-5 hours;
grinding temperature: 10-100 ℃;
granularity of ore grinding medium: <5 mm;
the dosage of the dispersant is as follows: 1-100 kg/t ore.
4. A method for the efficient pretreatment of refractory metal ores according to claim 1 or 3, wherein said dispersant is sodium hexametaphosphate and/or water glass.
5. The method for the efficient pretreatment of refractory metallurgical ore according to claim 1, wherein in step two, a part of the filtrate obtained by filtration is returned to mechanical activation slurry mixing, and the other part of the filtrate is treated to reach the discharge standard.
6. The method for the efficient pretreatment of refractory metal ore according to claim 1, wherein in said step two, NaOH is added simultaneously with the addition of the oxidizing agent to precipitate iron ions produced by the oxidation reaction.
7. A method for the efficient pretreatment of refractory metallurgical ore according to claim 6, wherein said pre-oxidation conditions are as follows:
solid-liquid ratio: 1, (1-10);
oxidation leaching time: 0.1-20 hours;
oxidation leaching temperature: 10-100 ℃;
the amount of NaOH used is as follows: 1-100 kg/t ore;
addition amount of an oxidizing agent: 1-5000 mol/t ore.
8. The method for the efficient pretreatment of refractory metal ore according to claim 1, 6 or 7, wherein said oxidizing agent is hydrogen peroxide, potassium permanganate or ozone.
9. The efficient pretreatment method for refractory metallurgical ore according to claim 1, wherein gold is extracted by cyanidation in the third step, gold and silver are recovered by a carbon slurry method or a displacement method after leaching is finished, leached tailings are filtered, filter cakes are discharged, and the filtrate is returned to the third step for size mixing.
10. The efficient pretreatment method for refractory metallurgical ores according to claim 9, wherein the solid-to-liquid ratio in leaching gold extraction is 1 (1-5), NaCN or an environment-friendly gold extraction agent is added according to the proportion of 0.001-50 g/L, air is filled for cyaniding leaching, and the leaching time is 0.1-80 hours.
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| CN104694764A (en) * | 2015-03-09 | 2015-06-10 | 中南大学 | Reinforced leaching method of fine-grained encapsulated gold |
| CN104818380A (en) * | 2015-04-23 | 2015-08-05 | 张伟晓 | Method for recovering gold and silver from refractory gold ores |
| CN106179722A (en) * | 2016-09-30 | 2016-12-07 | 青海省地质矿产测试应用中心 | Mineral processing technology for gold ore containing high-arsenic and high-antimony easily-argillized minerals |
| CN106521179A (en) * | 2016-11-04 | 2017-03-22 | 长春黄金研究院 | Method for increasing gold recovery rate in biological oxidation process of arsenic-containing gold concentrate |
| CN107955882A (en) * | 2017-11-20 | 2018-04-24 | 长沙有色冶金设计研究院有限公司 | The high-alkali Ultrafine Grinding extraction of gold process of Refractory Au-ores |
| CN108018418A (en) * | 2017-11-29 | 2018-05-11 | 长春黄金研究院 | A kind of wet type preprocess method of sulfide coated difficult-treating gold mine |
| CN108193049A (en) * | 2017-11-29 | 2018-06-22 | 贵州省地质矿产中心实验室 | Method for chemical pre-oxidation synchronous cyanide-free leaching of primary gold ore |
| CN111363929A (en) * | 2020-04-15 | 2020-07-03 | 昆明理工大学 | Gold ore dressing and smelting combined recovery process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114350973A (en) * | 2022-01-12 | 2022-04-15 | 中国地质科学院 | Pretreatment method of gold ore |
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