CN109046745B - Pre-enrichment method of low-grade gold-bearing sulfide tailing gold - Google Patents
Pre-enrichment method of low-grade gold-bearing sulfide tailing gold Download PDFInfo
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- CN109046745B CN109046745B CN201810842620.8A CN201810842620A CN109046745B CN 109046745 B CN109046745 B CN 109046745B CN 201810842620 A CN201810842620 A CN 201810842620A CN 109046745 B CN109046745 B CN 109046745B
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Abstract
The invention relates to a pre-enrichment method of low-grade gold-bearing sulfide tailing gold, which comprises the following steps: (1) grinding the raw ore, and performing mixed flotation and tailing discarding to obtain mixed concentrate; (2) adding an inhibitor into the bulk concentrate to inhibit arsenopyrite for separation and flotation to obtain gold-containing arsenopyrite; (3) the gold-containing arsenic ore is re-separated by adopting a flotation-gravity separation combined process to obtain gold-arsenic concentrate, so that the gold achieves the effect of pre-enrichment and the subsequent extraction of gold is facilitated. The raw material used by the method is the sulfide tailings of the nonferrous metal mine, and the method has stable treatment effect and simple process flow.
Description
Technical Field
The invention relates to the field of mineral processing, in particular to a pre-enrichment method of low-grade gold-bearing sulfide tailing gold.
Background
With the rapid development of economy, the discharge and accumulation of tailings in China are increased along with the development of mining industry. The main components of the gold-bearing sulfide tailings are pyrite and arsenopyrite, sulfuric acid and the like can be generated by long-term stacking and oxidation, the harm is brought to the ecological environment, and meanwhile, gold resources in the sulfide tailings are wasted.
Gold extraction is mostly carried out by cyanidation in gold concentration plants in China, the formation of refractory gold ores containing arsenic and sulfur is closely related to sulfide minerals such as pyrite, arsenopyrite, pyrrhotite and chalcopyrite, and cyaniding leaching of gold is influenced by reductive substances decomposed from sulfides (such as pyrite, arsenopyrite and pyrrhotite) and cyanide-consuming metals (such as copper, lead, zinc and iron).
Meanwhile, the existence of metal sulfide minerals complicates the optimization of a gold cyaniding process, so that the cyaniding rate of gold is difficult to improve, and the cyanide consumption is increased. Therefore, it is necessary to pre-enrich the low-grade gold-bearing vulcanized material, so that the grade of the gold-extracting gold ore is improved, the components of the gold-extracting gold ore are simplified, the optimization of later leaching is facilitated, and the production cost is reduced.
Disclosure of Invention
The invention provides a pre-enrichment method of low-grade gold-bearing sulfide tailing gold, which is simple in process and capable of greatly improving the grade of gold concentrate.
The technical scheme for realizing the invention is as follows: a pre-enrichment method of low-grade gold-containing sulfide tailing gold comprises the following steps:
(1) mixed flotation and tailing discarding: treating raw ore by a ball mill, and performing flotation to obtain foam concentrate and tailings 1 by adopting a flotation process of rough sweeping and middling returning;
(2) separation and flotation: performing separation flotation on the froth concentrate obtained in the step (1), wherein the separation flotation is a process flow of twice fine concentration and arsenic and sulfur inhibition flotation, and obtaining ore pulp tailings and flotation concentrate after the separation flotation;
(3) and (3) centralized recleaning of middlings: and (3) mixing and re-selecting the ore pulp tailings obtained in the step (2), wherein the re-selecting process is a flotation-re-selection combined process, and gold concentrate and tailings 2 are obtained.
After the raw ores in the step (1) are treated by the ball mill, the ground ore products with the granularity of less than 0.074mm account for 95.09% -97.26%.
The activating agent for the flotation roughing in the step (1) is H2SO4The dosage is 1000 g/t-4000 g/t; the flotation collecting agents are isobutyl potassium xanthate and aniline black, and the dosage of the flotation collecting agents is 150 g/t-200 g/t and 0-40 g/t respectively; the foaming agent is 2#The using amount of the oil is 20 g/t-40 g/t; scavenging differenceButyl potassium xanthate 100g/t, 2#Oil 20 g/t.
Separating and floating in the step (2), wherein lime is adopted as a pH regulator in the selection I, the pH value is adjusted to 7.8-8.6, and NH is added4Cl and NaHSO3The dosage of the inhibitor is 400 g/t-600 g/t and 400 g/t-600 g/t respectively, and NH is added into the concentration II4Cl and NaHSO3The dosage is 200 g/t-400 g/t and 200 g/t-400 g/t respectively.
The flotation in the step (3) is primary roughing, the concentration of flotation ore pulp is 25-50%, and an inhibitor NH is added4Cl and NaHSO3The using amounts are respectively 100 g/t-200 g/t and 100 g/t-300 g/t, the collecting agent is isobutyl potassium xanthate, the using amount is 20 g/t-60 g/t, and the foaming agent is 2#The amount of the oil is 20 g/t-30 g/t.
And (3) mixing the foam concentrate obtained after the flotation in the step (3) with the foam concentrate obtained in the step (1) to enter the step (2) for separation flotation.
And (4) the gravity separation equipment in the step (3) is a shaking table or a centrifugal concentrator.
The grade of the gold concentrate in the step (3) is 10.15-13.03 g/t.
In the step (1), the raw ore is the tailings of the metal mine, the main minerals are pyrite and arsenopyrite, gold is mainly embedded in the arsenopyrite in fine particles, and the ore grinding is difficult to achieve monomer dissociation. The material has stronger representativeness, and generally contains about 2g/t of gold.
And (4) reselecting the obtained concentrate to obtain the final gold concentrate, wherein the gold grade can reach 10.15-13.03 g/t, and selling the final gold concentrate to gold extraction enterprises.
The invention has the beneficial effects that: at present, most of gold in gold-containing polymetallic sulfide ores is preferentially floated, the pH value of ore pulp is adjusted by adding calcium oxide, and one or more combined medicaments of black medicaments, yellow medicaments and BK series are used as collecting agents to collect gold. However, the process is mostly suitable for the monomer gold or the coated gold coated by the pyrite, and the process is difficult to be suitable for the raw material mainly containing the arsenic pyrite coated gold. Aiming at the raw material, the combined process method of the mining, selecting, flotation and gravity separation carries out the pre-enrichment of gold, and the process flow is relatively simple. Meanwhile, the concentration of gravity concentration ore pulp is low, a certain ore washing effect is achieved, the quantity of gold concentrate attached agents is small, and the gold concentrate is more beneficial to leaching and smelting of gold.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
Example 1
A pre-enrichment method of low-grade gold-containing sulfide tailing gold comprises the following steps:
the low-grade gold-bearing sulfide tailings are selected, the sulfur content is 24.77%, the arsenic content is 5.27%, and the gold content is 2.16g/t, and the raw materials are ground until the materials with the particle size of less than 0.074mm account for 95.09%. Bulk flotation H2SO44000g/t, 200g/t of isobutyl potassium xanthate, 0g/t of aniline black drug and 2#20g/t of oil, 100g/t of sweepage isobutyl potassium xanthate and 2#Oil 20 g/t.
Separating, floating and concentrating I, CaO 300g/t, adjusting the pH value of ore pulp to 8.1, and inhibiting agent NH4Cl 500g/t，NaHSO3500 g/t. Selection II, inhibitor NH4Cl 200g/t，NaHSO3200g/t。
Concentrated recleaning of NH from middlings4Cl 100g/t，NaHSO3100g/t, 40g/t, 2 of isobutyl potassium xanthate#Oil 30g/t, flotation pulp concentration 50%. The gravity separation adopts a fine grain shaking table with the stroke of 14mm and the stroke frequency of 420n/min, and washing waterThe amount is about 0.6 t/h. Finally, gold concentrate containing 10.15g/t gold and with the recovery rate of 52.11% is obtained.
Example 2
A pre-enrichment method of low-grade gold-containing sulfide tailing gold comprises the following steps:
the low-grade gold-bearing sulfide tailings are selected, the sulfur content is 24.77 percent, the arsenic content is 5.27 percent, and the gold content is 2.16g/t, and the raw materials are ground to-0.074 mm which accounts for 97.26 percent. Bulk flotation H2SO41000g/t, 150g/t of isobutyl potassium xanthate, 20g/t of aniline black drug and 2#40g/t oil, 100g/t and 2g/t isobutyl potassium xanthate#Oil 25 g/t.
Separating, floating and concentrating I, CaO 400g/t, adjusting the pH value of ore pulp to 8.6, and inhibiting agent NH4Cl 400g/t，NaHSO3600 g/t. Selection II, inhibitor NH4Cl 400g/t，NaHSO3300g/t。
Concentrated recleaning of NH from middlings4Cl 150g/t，NaHSO3200g/t, 20g/t, 2 of isobutyl potassium xanthate#Oil 25g/t, flotation pulp concentration 30%. And (4) reselecting and adopting an slon-400 horizontal centrifugal concentrator, wherein the rotating speed is 600rpm, the rinsing water quantity is 6.35L/min, and the rinsing time is 20 s. Finally, gold concentrate containing 11.36g/t gold and with the recovery rate of 56.06% is obtained.
Example 3
A pre-enrichment method of low-grade gold-containing sulfide tailing gold comprises the following steps:
the low-grade gold-bearing sulfide tailings are selected, the sulfur content is 24.77 percent, the arsenic content is 5.27 percent, and the gold content is 2.16g/t, and the raw materials are ground to-0.074 mm which accounts for 96.25 percent. Bulk flotation H2SO43000g/t, 180g/t of isobutyl potassium xanthate, 40g/t of aniline nigre and 2#40g/t oil, 100g/t and 2g/t isobutyl potassium xanthate#Oil 30 g/t.
Separating flotation concentration I, CaO 200g/t, adjusting the pH value of ore pulp to 7.8, and inhibiting agent NH4Cl 600g/t，NaHSO3400 g/t. Selection II, inhibitor NH4Cl 300g/t，NaHSO3400g/t。
Concentrated recleaning of NH from middlings4Cl 200g/t，NaHSO3300g/t, 60g/t, 2 of isobutyl potassium xanthate#Oil 20g/t, flotation pulp concentration 25%. Reselection adoptionAnd the slon-400 horizontal centrifugal concentrator has the rotation speed of 500rpm, the rinsing water amount of 5.18L/min and the rinsing time of 30 s. Finally, gold concentrate containing 13.03g/t gold and with the recovery rate of 51.24 percent is obtained.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A pre-enrichment method of low-grade gold-containing sulfide tailing gold is characterized by comprising the following steps:
(1) mixed flotation and tailing discarding: treating raw ore by a ball mill, and performing flotation to obtain foam concentrate and tailings 1 by adopting a flotation process of rough sweeping and middling returning;
(2) separation and flotation: the froth concentrate obtained in the step (1) enters separation flotation, the separation flotation is a process flow of twice concentration and arsenic inhibition sulfur flotation, lime is adopted as a pH regulator in the twice concentration I, the pH value is adjusted to be 7.8-8.6, and NH is added4Cl and NaHSO3The dosage of the inhibitor is 400 g/t-600 g/t and 400 g/t-600 g/t respectively, and NH is added into the concentration II4Cl and NaHSO3The using amounts are respectively 200 g/t-400 g/t and 200 g/t-400 g/t, and ore pulp tailings and flotation concentrate are obtained after separation and flotation;
(3) and (3) centralized recleaning of middlings: and (3) mixing and re-selecting the ore pulp tailings obtained in the step (2), wherein the re-selecting process is a flotation-re-selection combined process, and gold concentrate and tailings 2 are obtained.
2. The pre-enrichment method of low-grade gold-containing sulfide tailing gold according to claim 1, characterized by comprising the following steps: after the raw ores in the step (1) are treated by the ball mill, the ground ore products with the granularity of less than 0.074mm account for 95.09% -97.26%.
3. The pre-enrichment method of low-grade gold-containing sulfide tailing gold according to claim 1, characterized by comprising the following steps: the activating agent for the flotation roughing in the step (1) is H2SO4The dosage is 1000 g/t-4000 g/t; the flotation collector is isobutyl potassium xanthateAnd aniline black powder, the dosage is 150 g/t-200 g/t, 0-40 g/t respectively; the foaming agent is 2#The using amount of the oil is 20 g/t-40 g/t; scavenging isobutyl potassium xanthate 100g/t, 2#Oil 20 g/t.
4. The pre-enrichment method of low-grade gold-containing sulfide tailing gold according to claim 1, characterized by comprising the following steps: the flotation in the step (3) is primary roughing, the concentration of flotation ore pulp is 25-50%, and an inhibitor NH is added4Cl and NaHSO3The using amounts are respectively 100 g/t-200 g/t and 100 g/t-300 g/t, the collecting agent is isobutyl potassium xanthate, the using amount is 20 g/t-60 g/t, and the foaming agent is 2#The amount of the oil is 20 g/t-30 g/t.
5. The pre-enrichment method of low-grade gold-containing sulfide tailing gold according to claim 1, characterized by comprising the following steps: and (3) mixing the foam concentrate obtained after the flotation in the step (3) with the foam concentrate obtained in the step (1) to enter the step (2) for separation flotation.
6. The pre-enrichment method of low-grade gold-containing sulfide tailing gold according to claim 1, characterized by comprising the following steps: and (4) the gravity separation equipment in the step (3) is a shaking table or a centrifugal concentrator.
7. The method for pre-enriching gold in low-grade gold-containing sulfide tailings according to any one of claims 1 to 6, wherein the pre-enriching method comprises the following steps: the grade of the gold concentrate in the step (3) is 10.15-13.03 g/t.
8. The method for pre-enriching gold in low-grade gold-containing sulfide tailings according to any one of claims 1 to 6, wherein the pre-enriching method comprises the following steps: the raw ore in the step (1) is the tailings of the metal mine, the tailings comprise pyrite and arsenopyrite, gold is embedded in the arsenopyrite in fine particles, and the gold content is 2 g/t.
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| RU2483127C1 (en) * | 2012-01-26 | 2013-05-27 | Федеральное государственное автономное образовательное учреждение высшего профессионального образования "Национальный исследовательский технологический университет "МИСиС" | Method of processing refractory gold-bearing pyrrotine-arsenopyrite ore |
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