CN112138859A - Beneficiation process for gold-containing oxidized ore - Google Patents
Beneficiation process for gold-containing oxidized ore Download PDFInfo
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- CN112138859A CN112138859A CN202010892734.0A CN202010892734A CN112138859A CN 112138859 A CN112138859 A CN 112138859A CN 202010892734 A CN202010892734 A CN 202010892734A CN 112138859 A CN112138859 A CN 112138859A
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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
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
Abstract
The invention relates to a beneficiation process of gold-containing oxidized ore, which is characterized in that in a primary ore grinding classification system, a jigger and a table concentrator are utilized to carry out two times of gravity separation on ore discharged by a primary ball mill, and a part of coarse-particle gold-carrying materials and alloy gold which is difficult to grind are recycled; in the secondary grinding classification system, a Nielsen centrifugal separator is used for reselecting the discharged ore of the secondary ball mill, and a part of coarse-particle gold-loaded material and the hard-to-grind alloy gold are recovered again. And (4) the classified product after the second-stage grinding enters a flotation process, the first flotation and the second concentration concentrate are used as final concentrate, and the second scavenging tailings are used as final tailings. The invention utilizes the combined process of multi-stage gravity separation and flotation, adopts an environment-friendly medicament, effectively solves the environment-friendly risk, and recovers valuable metals in the oxidized ore to the maximum extent under the condition of meeting the environment-friendly requirement.
Description
Technical Field
The invention relates to a beneficiation process of gold-containing oxidized ore. In particular to a mineral processing technology aiming at gold-containing oxidized ore near the surface.
Background
At present, the treatment of oxidized ore generally adopts full mud cyanidation or dump leaching, and can obtain better recovery indexes. The refractory ore is treated mainly through roasting and pressurizing or through chemical oxidation and chlorination leaching. The writing method not only causes serious pollution to the environment, but also has the problem of poor leaching effect.
In addition, for the gold-containing oxidized ore resource on the near surface, the ore is more difficult to treat due to the high degree of oxidation and the near surface of the ore.
For example, the gold-containing oxidized ore resource is near the surface of the gold ore of the san shan island of the gold group of Shandong, the amount of the collected ore is about 50 ten thousand, and the research of the process mineralogy shows that the gold-containing oxidized ore has the following characteristics: the gold-containing oxidized ore has low content of metal minerals, and the main metal minerals comprise hematite, magnetite, limonite, pyrite, chalcopyrite, pyrrhotite, galena, blende, copper blue and the like. The metal minerals are mainly metal oxides, most of which are hematite, magnetite, limonite and the like, and the minerals are usually cemented into other minerals in the form of cement or are intercrossed along the edges and cracks of other minerals. The gold mineral is selected from natural gold and silver-gold ore, mainly silver-gold ore.
The composition of the multi-element analysis is shown in the following table.
| Au(g/t) | Ag(g/t) | Cu | Pb | Zn | Fe | S |
| 3.03 | 2.70 | 0.005 | 0.053 | 0.089 | 3.74 | 0.22 |
| As | Sb | CaO | MgO | Al2O3 | SiO2 | |
| 0.013 | Not detected out | 0.45 | 0.48 | 9.06 | 74.77 |
Experiments show that the existing beneficiation process is difficult to treat the gold-containing oxidized ores, and the recovery rate is unsatisfactory.
Disclosure of Invention
The invention aims to solve the technical problem of providing a beneficiation process for gold-containing oxidized ore, which can recover valuable metals in the gold-containing oxidized ore to the maximum extent and meet the requirement of environmental protection.
The technical scheme of the invention is as follows:
a mineral processing technology of gold-containing oxidized ore is characterized by comprising the step of gravity separation and flotation in the step of grinding in sequence;
(1) and reselecting in the stage grinding stage: in a first-stage ore grinding grading system, a jigger and a table are utilized to carry out two times of gravity separation on ore discharged from a first-stage ball mill, and a part of coarse-particle gold-carrying materials and alloy gold which is difficult to grind are recovered; in a secondary grinding classification system, a Nielsen centrifugal separator is used for reselecting the discharged ore of the secondary ball mill, and a part of coarse-particle gold-loaded materials and the alloy gold which is difficult to grind are recovered again;
(2) and flotation: the method adopts the processes of preferential flotation, rough concentration, twice concentration and twice scavenging, the classified product after the second stage of ore grinding enters a flotation process, the concentrate of the preferential flotation and the second concentration is the final concentrate, and the tailing of the second scavenging is the final tailing.
The specific beneficiation process is as follows:
(1) and reselecting in the stage grinding stage: the crushed ore is subjected to primary ore grinding by a first ball mill and then enters a jigger for primary gravity separation, gravity concentrate output by the jigger enters a shaking table for secondary gravity separation, tailings output by the shaking table return to the jigger to form closed cycle, and the concentrate output by the shaking table is final concentrate; gravity tailings output by the jigger enter a classifier for classification, return sand output by the classifier returns to a ball mill to form closed circuit grinding, overflow products output by the classifier are conveyed to a cyclone by a pump for classification, sand deposited by the cyclone enters a second ball mill for secondary section grinding, then enters a Nielsen centrifugal concentrator for gravity separation, gravity concentrate is used as final concentrate, the gravity tailings automatically flow to an overflow product pump pool of the classifier, and the gravity tailings and overflow products of the classifier are conveyed to the cyclone by the pump to form closed circuit circulation; the overflow product of the cyclone enters the next step;
(2) and flotation: the overflow product of the cyclone enters a stirring tank to be fully mixed with the medicament and then enters a preferential flotation machine for preferential flotation; preferentially floating the foam product to obtain final flotation concentrate; the preferential flotation tailings, the primary concentration tailings and the primary scavenging foam products enter a roughing flotation machine for roughing; the roughing tailings and the secondary scavenging foam products enter a primary scavenging flotation machine for primary scavenging, the primary scavenging tailings enter a secondary scavenging flotation machine for secondary scavenging, and the secondary scavenging tailings are final tailings; and (3) feeding the roughing foam products and the secondary concentration tailings into a primary concentration flotation machine for primary concentration, feeding the primary concentration foam products into a secondary concentration flotation machine for secondary concentration, and obtaining the secondary concentration foam products as final flotation concentrates.
The preferred dosage regimen is as follows:
the dosage of the sodium carbonate serving as the regulator is 400g/t of dry ore, and the adding position is an ore feeding pump pool at the front end of the cyclone; the usage amount of the activating agent copper sulfate is 200g/t dry ore, the adding position is that the two-time adding proportion of the stirring tank and an ore feeding box at the front end of the primary scavenging flotation machine is 2 (0.8-1.2), and the activating agent copper sulfate is added in several times; the method comprises the following steps of mixing collecting agents of ammonium buterate black powder with the dosage of 50g/t dry ore, 25# sodium black powder with the dosage of 50g/t dry ore and isoamyl yellow powder with the dosage of 50g/t dry ore, adding the three collecting agents into a stirring tank, an ore feeding box at the front end of a primary scavenging flotation machine and an ore feeding box at the front end of a secondary scavenging flotation machine, wherein the adding proportion of the three collecting agents is as follows: 6:3: 1; the amount of 2# oil used as a foaming agent is 30g/t dry ore, the adding positions are a stirring tank, an ore feeding box at the front end of a primary scavenging flotation machine and an ore feeding box at the front end of a secondary scavenging flotation machine, and the adding proportions of the three parts are as follows: 6:3:1.
The invention has the positive effects that:
the process of the invention fully utilizes the specific gravity characteristics and interface characteristics of the gold-containing materials, combines the new process of gravity separation and flotation at the grinding stage of the gold-containing oxidized ore stage, can obtain good ore dressing indexes, and is suitable for ore dressing treatment of the gold-containing oxidized ore. After the gold-bearing oxidized ore with the raw ore grade of 3.2g/t is reselected and floated by the method, the grade of the first-stage reselected gold concentrate reaches more than 100g/t, the grade of the second-stage reselected gold concentrate reaches more than 200g/t, the grade of the floated gold concentrate reaches more than 50g/t, the grade of the floated tailings is lower than 0.37g/t, and the total recovery rate is 86.32%.
In addition, the process of the invention does not add any toxic and harmful medicament, and is clean and environment-friendly. The invention is particularly suitable for the ore dressing of gold-containing oxidized ore on the near surface.
Drawings
FIG. 1 is a process flow diagram of an embodiment of the invention.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
Referring to fig. 1, an embodiment of the beneficiation process of the present invention comprises a stage grinding stage gravity separation subsystem and a flotation subsystem.
Firstly, a stage grinding stage reselection subsystem:
the crushed ore (raw ore) is subjected to primary ore grinding by a first ball mill 1 and then enters a jigger 2 for primary gravity separation, gravity concentrate output by the jigger 2 enters a shaking table 3 for secondary gravity separation, tailings output by the shaking table 3 return to the jigger 2 to form closed cycle, and the concentrate output by the shaking table 3 is final concentrate; gravity tailings output by the jigger 2 enter a classifier 4 for classification, return sand output by the classifier 4 returns to the ball mill 1 to form closed circuit grinding, overflow products output by the classifier 4 are conveyed to a cyclone 5 by a pump for classification, settled sand of the cyclone 5 enters a second ball mill 6 for secondary section grinding, then enters a Nielsen centrifugal separator 7 for gravity separation, gravity concentrate is used as final concentrate, the gravity tailings automatically flow to an overflow product pump pool of the classifier, and are conveyed to the cyclone 5 together with overflow products of the classifier 4 by the pump to form closed circuit circulation; cyclone 5 overflows the product into the flotation subsystem.
Secondly, a flotation subsystem:
the overflow product of the cyclone 5 enters the stirring tank 8 to be fully mixed with the medicament and then enters the preferential flotation machine 9 for preferential flotation. Preferentially floating the foam product to obtain final flotation concentrate; the preferential flotation tailings, the primary concentration tailings and the primary scavenged froth products enter a rougher flotation machine 10 for rougher flotation.
The roughing tailings and the secondary scavenging foam products enter a primary scavenging flotation machine 11 for primary scavenging, the primary scavenging tailings enter a secondary scavenging flotation machine 12 for secondary scavenging, and the secondary scavenging tailings are final tailings;
the roughing foam products and the secondary concentration tailings enter a primary concentration flotation machine 13 for primary concentration, the primary concentration foam products enter a secondary concentration flotation machine 14 for secondary concentration, and the secondary concentration foam products are final flotation concentrates.
A medicament system: the dosage of the regulator sodium carbonate is 400g/t dry ore, and the adding position is an ore feeding pump pool at the front end of the cyclone 5. The usage amount of the activating agent copper sulfate is 200g/t dry ore, the adding positions are a stirring tank (130g/t dry ore) and an ore feeding box (70g/t dry ore) at the front end of the primary scavenging flotation machine 11, and the activating agent copper sulfate is added in several times. The method comprises the following steps that collecting agents of ammonium buterate black powder with the dosage of 50g/t dry ore, 25# sodium black powder with the dosage of 50g/t dry ore and isoamyl yellow powder with the dosage of 50g/t dry ore are mixed, and the adding positions of the collecting agents of the ammonium buterate black powder, the dry ore, an ore feeding box 45g/t dry ore at the front end of a primary scavenging flotation machine 11 and an ore feeding box 15g/t dry ore at the front end of a secondary scavenging flotation machine 12 are stirring grooves 90g/t dry ore; the amount of the foaming agent (2# oil) is 30g/t dry ore, and the proportion of the addition positions and the three positions is the same as that of the collecting agent.
Example 1
Under the new process of mineral separation of the embodiment of the invention, when the treatment capacity is about 2000t/d and the gold-containing oxidized ore level is 3.41g/t, the content of the selected fineness-200 meshes reaches 63 percent, and the production data is shown in the following table.
| Name (R) | Mineral quantity (ton) | Concentrate grade (g/t) | Recovery (%) |
| Raw ore | 57539.00 | 3.41 | |
| Shaking table concentrate | 354.09 | 102.78 | 18.55 |
| Nielsen concentrate | 121.10 | 252.69 | 15.60 |
| Flotation of concentrates | 1987.22 | 58.78 | 59.53 |
| Flotation of tailings | 55076.59 | 0.22 |
The treatment capacity in a month is 57539 tons, the raw ore grade is 3.41g/t, the comprehensive concentrate grade is 74.70g/t, the tailing grade is 0.22g/t, and the total recovery rate is 93.68%.
Example 2
Under the new process of ore dressing of the embodiment of the invention, when the treatment capacity is about 2800t/d and the gold-containing oxidized ore level is 3.38g/t, the content of the selected fineness-200 meshes reaches 55%, and the production data is shown in the following table.
| Name (R) | Mineral quantity (ton) | Concentrate grade (g/t) | Recovery (%) |
| Raw ore | 86641.00 | 3.38 | |
| Shaking table concentrate | 651.61 | 82.52 | 18.36 |
| Nielsen concentrate | 237.11 | 237.93 | 19.26 |
| Flotation of concentrates | 3108.65 | 50.21 | 53.30 |
| Flotation of tailings | 82643.63 | 0.37 |
The treatment capacity in a month is 86641 tons, the raw ore grade is 3.38g/t, the comprehensive concentrate grade is 66.61g/t, the tailing grade is 0.37g/t, and the total recovery rate is 90.6 percent.
Example 3
By adopting the method provided by the embodiment of the invention, the accumulative treatment capacity of the gold-containing oxidized ore at a shallow part of a certain mine is 48.06 ten thousand tons, the raw ore grade is 2.64g/t, the comprehensive concentrate grade is 63.80g/t, the tailing grade is 0.37g/t, the total recovery rate is 86.32 percent, and the gold yield is 1100.85 kg.
Claims (3)
1. A mineral processing technology of gold-containing oxidized ore is characterized by comprising the step of gravity separation and flotation in the step of grinding in sequence;
(1) and reselecting in the stage grinding stage: in a first-stage ore grinding grading system, a jigger and a table are utilized to carry out two times of gravity separation on ore discharged from a first-stage ball mill, and a part of coarse-particle gold-carrying materials and alloy gold which is difficult to grind are recovered; in a secondary grinding classification system, a Nielsen centrifugal separator is used for reselecting the discharged ore of the secondary ball mill, and a part of coarse-particle gold-loaded materials and the alloy gold which is difficult to grind are recovered again;
(2) and flotation: the method adopts the processes of preferential flotation, rough concentration, twice concentration and twice scavenging, the classified product after the second stage of ore grinding enters a flotation process, the concentrate of the preferential flotation and the second concentration is the final concentrate, and the tailing of the second scavenging is the final tailing.
2. The process for beneficiation of gold-containing oxidized ores according to claim 1, wherein:
(1) and reselecting in the stage grinding stage: the crushed ore enters a jigger (2) for primary reselection after being subjected to primary ore grinding by a first ball mill (1), reselected concentrate output by the jigger (2) enters a shaking table (3) for secondary reselection, tailings output by the shaking table (3) return to the jigger (2) to form closed cycle, and the concentrate output by the shaking table (3) is final concentrate; gravity tailings output by the jigger (2) enter a classifier (4) for classification, return sand output by the classifier (4) returns to the ball mill (1) to form closed circuit grinding, overflow products output by the classifier (4) are conveyed to a cyclone (5) by a pump for classification, settled sand of the cyclone (5) enters a second ball mill (6) for secondary section grinding, then enters a Nielson centrifugal separator (7) for gravity separation, gravity concentrate is used as final concentrate, gravity tailings automatically flow to an overflow product pump pool of the classifier, and overflow products of the classifier (4) are conveyed to the cyclone (5) by the pump to form closed circuit circulation; the overflow product of the cyclone (5) enters the next step;
(2) and flotation: the overflow product of the cyclone (5) enters a stirring tank (8) to be fully mixed with the medicament and then enters a preferential flotation machine (9) for preferential flotation; preferentially floating the foam product to obtain final flotation concentrate; the preferential flotation tailings, the primary selection tailings and the primary scavenging foam products enter a roughing flotation machine (10) for roughing;
the roughing tailings and the secondary scavenging foam products enter a primary scavenging flotation machine (11) for primary scavenging, the primary scavenging tailings enter a secondary scavenging flotation machine (12) for secondary scavenging, and the secondary scavenging tailings are final tailings; the roughing foam products and the secondary concentration tailings enter a primary concentration flotation machine (13) for primary concentration, the primary concentration foam products enter a secondary concentration flotation machine (14) for secondary concentration, and the secondary concentration foam products are final flotation concentrates.
3. The beneficiation process of gold-bearing oxidized ore according to claim 2, wherein the chemical system is:
the dosage of the regulator sodium carbonate is 400g/t dry ore, and the adding position is an ore feeding pump pool at the front end of the cyclone (5); the usage amount of the activating agent copper sulfate is 200g/t dry ore, the adding positions of the activating agent copper sulfate are that the two-time adding proportion of an agitating tank and an ore feeding box at the front end of a primary scavenging flotation machine (11) is 2 (0.8-1.2), and the activating agent copper sulfate is added in several times; the method comprises the following steps of mixing collecting agents of ammonium buterate black powder with the dosage of 50g/t dry ore, 25# sodium black powder with the dosage of 50g/t dry ore and isoamyl yellow powder with the dosage of 50g/t dry ore, adding the three collecting agents into a stirring tank, an ore feeding box at the front end of a primary scavenging flotation machine (11) and an ore feeding box at the front end of a secondary scavenging flotation machine (12), and adding the three collecting agents according to the proportion: 6:3: 1; the amount of 2# oil used as a foaming agent is 30g/t dry ore, the adding positions are a stirring tank, an ore feeding box at the front end of a primary scavenging flotation machine (11) and an ore feeding box at the front end of a secondary scavenging flotation machine (12), and the adding proportions of the three parts are as follows: 6:3:1.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113731625A (en) * | 2021-08-19 | 2021-12-03 | 河南金源黄金矿业有限责任公司 | Low-grade ore dressing process |
| CN115007304A (en) * | 2022-04-25 | 2022-09-06 | 昆明理工大学 | System and process for improving gold recovery rate by secondary accurate control classification and pre-recovery of ore grinding |
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| CN113731625A (en) * | 2021-08-19 | 2021-12-03 | 河南金源黄金矿业有限责任公司 | Low-grade ore dressing process |
| CN115007304A (en) * | 2022-04-25 | 2022-09-06 | 昆明理工大学 | System and process for improving gold recovery rate by secondary accurate control classification and pre-recovery of ore grinding |
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Application publication date: 20201229 |