CN113388732A - Beneficiation method for comprehensively recovering iron and gold from iron and gold ore - Google Patents
Beneficiation method for comprehensively recovering iron and gold from iron and gold ore Download PDFInfo
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- CN113388732A CN113388732A CN202110520341.1A CN202110520341A CN113388732A CN 113388732 A CN113388732 A CN 113388732A CN 202110520341 A CN202110520341 A CN 202110520341A CN 113388732 A CN113388732 A CN 113388732A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/025—High gradient magnetic separators
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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
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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
- 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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Abstract
The invention relates to a beneficiation method for comprehensively recovering iron and gold from iron and gold ores, which comprises the following steps: sintering: placing a crude gold iron ore with a particle size of-3 mm into a rotary kiln for calcination to obtain a calcined product and calcined flue gas; grinding: putting the calcined product into a ball mill for ore grinding to obtain ore pulp with the ore grinding fineness of less than 0.074mm and the content of 80% -95%; cyaniding and leaching: adjusting the concentration of the ore pulp obtained in the step II to 35-45%, and then adding lime and sodium cyanide for leaching to obtain pregnant solution and leaching slag; fourthly, rinsing and drying to obtain leaching residues; carrying out reduction roasting: uniformly mixing the leaching slag and anthracite, and then carrying out reduction roasting to obtain calcine and roasting smoke; sixthly, high gradient magnetic separation: and placing the calcine into a strong magnetic roller type magnetic separator for magnetic separation, and performing rough separation and fine separation to obtain qualified iron ore concentrate and tailings. The method has the characteristics of strong applicability of the process flow, low production cost, high recovery rate, easy industrial popularization and application and the like.
Description
Technical Field
The invention relates to the technical field of mineral processing, in particular to a beneficiation method for comprehensively recovering iron and gold from iron and gold ores.
Background
The iron ore is generally formed by oxidation of sulphide ores, which are very difficult to beneficiate. The iron-gold ore contains a large amount of iron oxides and hydroxides, such as goethite, magnetite, limonite, etc., which are very dense. The iron oxide is covered on the surface of the gold in a dense film form, so that 'embroidered' gold or gold is formed in the crystal of limonite and goethite in a fine-grain impregnation state, and the monomer can not be dissociated even if the gold is finely ground, so that the ore is difficult to sort.
With the increasing exhaustion of mineral resources and the increasing recovery of metal prices, the recovery of valuable elements from refractory ores becomes an important subject of current research. At present, methods for recovering iron and gold ores comprise a flotation method, a magnetic separation method, a full-mud cyaniding leaching and combined process and the like, but the methods have the defects of low recovery rate, unobvious recovery effect and the like.
Disclosure of Invention
The invention aims to solve the technical problem of providing the beneficiation method for comprehensively recovering the iron and gold from the iron and gold ore, which has low cost and high recovery rate.
In order to solve the problems, the invention provides a beneficiation method for comprehensively recovering iron and gold from iron and gold ores, which comprises the following steps:
sintering:
placing a 3 mm-sized crude iron-gold ore into a rotary kiln, calcining at 250-350 ℃ for 2-4 h to obtain a calcined product and a calcined flue gas, and purifying the calcined flue gas to reach the standard and then emptying the calcined flue gas;
grinding:
putting the calcined product into a ball mill, and grinding under the condition that the grinding concentration is 60-75% to obtain ore pulp with the grinding fineness of less than 0.074mm and the content of 80-95%;
cyaniding and leaching:
adjusting the concentration of the ore pulp obtained in the second step to 35-45%, and then adding lime and sodium cyanide for leaching to obtain pregnant solution and leaching slag; the pregnant solution enters a gold extraction process; adding 3000-6000 g of lime into 1t of raw iron-gold ore; 500-1000 g of sodium cyanide is added according to 1t of raw iron gold ore;
fourthly, rinsing and drying:
rinsing the leaching residues for several times until rinsing water reaches a dischargeable standard, and drying the rinsed leaching residues to obtain leaching residues;
carrying out reduction roasting:
and the leaching slag and anthracite are mixed according to the weight ratio of 5-10: 1-2, carrying out reduction roasting to obtain calcine and roasting flue gas, and emptying the roasting flue gas after the roasting flue gas is purified to reach the standard;
sixthly, high gradient magnetic separation:
and placing the calcine into a strong magnetic roller type magnetic separator for magnetic separation, and performing rough separation and fine separation to obtain qualified iron ore concentrate and tailings.
And the leaching time in the step three is 12-18 h.
And step four, rinsing is to rinse the leached residues for 3-5 times by using lime and bleaching powder until rinsing water reaches a dischargeable standard.
The condition of the reduction roasting in the step fifthly is that the temperature is 1000-1500 ℃ and the time is 2-6 hours.
The condition of magnetic separation in the step sixteenth means that the magnetic field intensity is 0.8-1.2T, and an 2/4 medium box is selected.
Compared with the prior art, the invention has the following advantages:
1. the invention adopts calcining heat treatment for iron ore, so that the compact iron hydroxide film on the surface of gold is heated to decompose and remove crystallization water to form porous limonite ore particles, the gold is exposed, and the ore particles form good conditions for leaching and dissolving the gold.
2. The formation of the porous limonite ore particles in the invention is carried out by ore grinding-cyaniding leaching, so that the gold and sodium cyanide fully and rapidly act, the leaching time is shortened, the dosage of cyaniding agents is reduced, and the production cost is saved.
3. In the invention, the leached slag is rinsed and dried for multiple times, then is subjected to reduction roasting, and then is subjected to high-gradient magnetic separation to finally obtain qualified iron concentrate, so that the comprehensive recovery of iron is realized, and the resource utilization efficiency is improved.
4. The method has the characteristics of strong applicability of the process flow, low production cost, easy industrial popularization and application and the like.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
As shown in fig. 1, a beneficiation method for comprehensively recovering iron and gold from iron and gold ore comprises the following steps:
sintering:
placing a raw iron-gold ore with a particle size of-3 mm into a rotary kiln, calcining at 250-350 ℃ for 2-4 h to obtain a calcined product and a calcined flue gas, wherein the calcined flue gas is purified to reach the standard and then is evacuated.
Grinding:
placing the calcined product into a ball mill, and grinding the calcined product under the condition that the grinding concentration is 60-75% to obtain ore pulp with the grinding fineness of less than 0.074mm and the content of 80-95%.
Cyaniding and leaching:
adjusting the concentration of the ore pulp obtained in the step II to 35-45%, and then adding lime and sodium cyanide for leaching for 12-18 h to obtain pregnant solution and leaching residues; the pregnant solution enters a gold extraction process, and gold is extracted by methods such as carbon adsorption or electrodeposition.
Adding 3000-6000 g of lime into 1t of raw iron-gold ore; 500-1000 g of sodium cyanide is added according to 1t of the raw iron gold ore.
Fourthly, rinsing and drying:
and rinsing the leached residues for 3-5 times by using lime and bleaching powder until rinsing water reaches a dischargeable standard, and drying the rinsed leached residues to obtain the leached residues.
Carrying out reduction roasting:
leaching slag and anthracite are mixed according to the weight ratio of 5-10: 1-2, and carrying out reduction roasting at 1000-1500 ℃ for 2-6 h to obtain calcine and roasting flue gas, wherein the roasting flue gas is purified to reach the standard and then is exhausted.
Sixthly, high gradient magnetic separation:
and (3) placing the roasted product into a strong magnetic roller type magnetic separator, selecting an 2/4 medium box for magnetic separation under the condition that the magnetic field intensity is 0.8-1.2T, and performing rough separation and fine separation to obtain qualified iron ore concentrate and tailings.
Example 1A certain ferro-gold ore of Xinjiang contains 2.45g/t of gold and 37.45% of iron.
A beneficiation method for comprehensively recovering iron and gold from iron and gold ores comprises the following steps:
sintering:
placing a crude gold iron ore with a particle size of-3 mm into a rotary kiln, calcining at 300 ℃ for 3h to obtain a calcined product and a calcined flue gas, and purifying the calcined flue gas to reach the standard and then emptying the calcined flue gas.
Grinding:
putting the calcined product into a ball mill, and grinding under the condition that the grinding concentration is 70% to obtain ore pulp with the grinding fineness of less than 0.074mm and the content of 85%.
Cyaniding and leaching:
and adjusting the concentration of the ore pulp obtained in the step II to 40%, and then adding 5000 g/t of lime and 600g/t of sodium cyanide for leaching, wherein the leaching time is 16h, and the pregnant solution and the leached slag with the gold leaching rate of 89.96% are obtained.
Fourthly, rinsing and drying:
and rinsing the leached residues for 5 times by adopting lime and bleaching powder until rinsing water reaches a dischargeable standard, and drying the rinsed leached residues to obtain the leached residues.
Carrying out reduction roasting:
the leaching slag and anthracite are mixed according to the proportion of 5: 1 (g/g), reducing and roasting at 1200 ℃ for 4h to obtain roasted sand and roasted flue gas, and emptying the roasted flue gas after the roasted flue gas is purified to reach the standard.
Sixthly, high gradient magnetic separation:
and (3) putting the calcine into a strong magnetic roller type magnetic separator, selecting an 2/4 medium box for magnetic separation under the condition that the magnetic field intensity is 1.0T, and performing rough separation and fine separation to obtain qualified iron ore concentrate and tailings. The iron grade in the iron ore concentrate is 62.44%, and the iron recovery rate is 86.72%.
Example 2A Sichuan iron-gold ore contains gold 1.76g/t and iron 38.61%.
A beneficiation method for comprehensively recovering iron and gold from iron and gold ores comprises the following steps:
sintering:
placing a crude gold iron ore with a particle size of-3 mm in a rotary kiln, calcining at 350 ℃ for 4h to obtain a calcined product and a calcined flue gas, and purifying the calcined flue gas to reach the standard and then exhausting the calcined flue gas.
Grinding:
putting the calcined product into a ball mill, and grinding under the condition that the grinding concentration is 65% to obtain ore pulp with the grinding fineness of less than 0.074mm and the content of 90%.
Cyaniding and leaching:
and adjusting the concentration of the ore pulp obtained in the step II to 45%, and then adding 6000 g/t of lime and 800g/t of sodium cyanide for leaching, wherein the leaching time is 18h, and the pregnant solution and the leached slag with the gold leaching rate of 86.98% are obtained.
Fourthly, rinsing and drying:
and rinsing the leaching residues for 4 times by using lime and bleaching powder until rinsing water reaches a dischargeable standard, and drying the rinsed leaching residues to obtain the leaching residues.
Carrying out reduction roasting:
the leaching slag and anthracite are mixed according to the weight ratio of 10: 1 (g/g), reducing and roasting at 1500 ℃ for 6 hours to obtain roasted sand and roasted flue gas, and emptying the roasted flue gas after the roasted flue gas is purified to reach the standard.
Sixthly, high gradient magnetic separation:
and (3) putting the roasted product into a strong magnetic roller type magnetic separator, selecting an 2/4 medium box for magnetic separation under the condition that the magnetic field intensity is 1.2T, and performing rough separation and fine separation to obtain qualified iron ore concentrate and tailings. The iron grade in the iron ore concentrate is 65.34%, and the iron recovery rate is 85.45%.
Example 3 gold-containing iron ore from Shandong province, gold 3.05g/t, iron 35.41%.
A beneficiation method for comprehensively recovering iron and gold from iron and gold ores comprises the following steps:
sintering:
placing a crude gold iron ore with a particle size of-3 mm into a rotary kiln, calcining at 250 ℃ for 2h to obtain a calcined product and a calcined flue gas, and purifying the calcined flue gas to reach the standard and then exhausting the calcined flue gas.
Grinding:
placing the calcined product into a ball mill, and grinding under the condition that the grinding concentration is 60% to obtain ore pulp with the grinding fineness of less than 0.074mm and the content of 80%.
Cyaniding and leaching:
and adjusting the concentration of the ore pulp obtained in the step II to 38%, and then adding 3000 g/t of lime and 1000g/t of sodium cyanide for leaching, wherein the leaching time is 18h, and the pregnant solution and the leached slag with the gold leaching rate of 90.34% are obtained.
Fourthly, rinsing and drying:
and rinsing the leaching residues for 3 times by using lime and bleaching powder until rinsing water reaches a dischargeable standard, and drying the rinsed leaching residues to obtain the leaching residues.
Carrying out reduction roasting:
the leaching slag and anthracite are mixed according to the weight ratio of 10: 1 (g/g), reducing and roasting for 3h at 1000 ℃ to obtain roasted sand and roasted flue gas, and emptying the roasted flue gas after the roasted flue gas is purified to reach the standard.
Sixthly, high gradient magnetic separation:
and (3) putting the calcine into a strong magnetic roller type magnetic separator, selecting an 2/4 medium box for magnetic separation under the condition that the magnetic field intensity is 0.8T, and performing rough separation and fine separation to obtain qualified iron ore concentrate and tailings. The iron grade in the iron ore concentrate is 62.77%, and the iron recovery rate is 84.34%.
Claims (5)
1. A beneficiation method for comprehensively recovering iron and gold from iron and gold ores comprises the following steps:
sintering:
placing a 3 mm-sized crude iron-gold ore into a rotary kiln, calcining at 250-350 ℃ for 2-4 h to obtain a calcined product and a calcined flue gas, and purifying the calcined flue gas to reach the standard and then emptying the calcined flue gas;
grinding:
putting the calcined product into a ball mill, and grinding under the condition that the grinding concentration is 60-75% to obtain ore pulp with the grinding fineness of less than 0.074mm and the content of 80-95%;
cyaniding and leaching:
adjusting the concentration of the ore pulp obtained in the second step to 35-45%, and then adding lime and sodium cyanide for leaching to obtain pregnant solution and leaching slag; the pregnant solution enters a gold extraction process; adding 3000-6000 g of lime into 1t of raw iron-gold ore; 500-1000 g of sodium cyanide is added according to 1t of raw iron gold ore;
fourthly, rinsing and drying:
rinsing the leaching residues for several times until rinsing water reaches a dischargeable standard, and drying the rinsed leaching residues to obtain leaching residues;
carrying out reduction roasting:
and the leaching slag and anthracite are mixed according to the weight ratio of 5-10: 1-2, carrying out reduction roasting to obtain calcine and roasting flue gas, and emptying the roasting flue gas after the roasting flue gas is purified to reach the standard;
sixthly, high gradient magnetic separation:
and placing the calcine into a strong magnetic roller type magnetic separator for magnetic separation, and performing rough separation and fine separation to obtain qualified iron ore concentrate and tailings.
2. The beneficiation method for comprehensively recovering the iron and gold from the iron and gold ore according to claim 1, wherein: and the leaching time in the step three is 12-18 h.
3. The beneficiation method for comprehensively recovering the iron and gold from the iron and gold ore according to claim 1, wherein: and step four, rinsing is to rinse the leached residues for 3-5 times by using lime and bleaching powder until rinsing water reaches a dischargeable standard.
4. The beneficiation method for comprehensively recovering the iron and gold from the iron and gold ore according to claim 1, wherein: the condition of the reduction roasting in the step fifthly is that the temperature is 1000-1500 ℃ and the time is 2-6 hours.
5. The beneficiation method for comprehensively recovering the iron and gold from the iron and gold ore according to claim 1, wherein: the condition of magnetic separation in the step sixteenth means that the magnetic field intensity is 0.8-1.2T, and an 2/4 medium box is selected.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105797848A (en) * | 2016-03-18 | 2016-07-27 | 广州有色金属研究院 | Intensified gold leaching method including strong magnetic separation and pre-removal of fine silt in gold-iron oxidized ore |
| CN105803185A (en) * | 2016-03-18 | 2016-07-27 | 广州有色金属研究院 | Mineral processing method of comprehensively recovering gold-iron oxidized minerals in grouping and classifying manner |
| CN108246494A (en) * | 2018-01-11 | 2018-07-06 | 江苏盐城环保科技城重金属防治研究中心 | A kind of method for detaching iron in high ferro cyanidation tailings |
| CN111455165A (en) * | 2020-05-29 | 2020-07-28 | 东北大学 | Suspension magnetization roasting cyanogen breaking-low intensity magnetic separation iron extraction device for high-iron cyanidation tailings |
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2021
- 2021-05-13 CN CN202110520341.1A patent/CN113388732A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105797848A (en) * | 2016-03-18 | 2016-07-27 | 广州有色金属研究院 | Intensified gold leaching method including strong magnetic separation and pre-removal of fine silt in gold-iron oxidized ore |
| CN105803185A (en) * | 2016-03-18 | 2016-07-27 | 广州有色金属研究院 | Mineral processing method of comprehensively recovering gold-iron oxidized minerals in grouping and classifying manner |
| CN108246494A (en) * | 2018-01-11 | 2018-07-06 | 江苏盐城环保科技城重金属防治研究中心 | A kind of method for detaching iron in high ferro cyanidation tailings |
| CN111455165A (en) * | 2020-05-29 | 2020-07-28 | 东北大学 | Suspension magnetization roasting cyanogen breaking-low intensity magnetic separation iron extraction device for high-iron cyanidation tailings |
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