Coupled beneficiation method for gold-bearing copper ore with high sulfur-copper ratio

Abstract

A coupled beneficiation method for gold-bearing copper ores with a high sulfur-to-copper ratio employs the SABC process. The ore is graded by semi-autogenous grinding and ball milling, copper is enriched by bioleaching using semi-autogenous grinding stone, coarse gold in the crushed product is selectively enriched by Nelson, copper is separated by Nelson tailings using differential speed asynchronous separation, fine gold is enriched into copper concentrate using a gold-loaded sulfide collector BY-19 coupled with a low-alkalinity inhibitor BY-23, and the sulfur concentrate is recovered by microbubble flotation using a BY-80 collector, thereby improving the recoveries of gold, copper, and sulfur. Specifically, the method comprises the following steps: semi-autogenous grinding and ball milling for classification, copper is enriched by bioleaching using semi-autogenous grinding stone, coarse gold in the crushed product is selectively enriched by Nelson, copper is separated by Nelson tailings using differential speed asynchronous separation, fine gold is enriched into copper concentrate using a gold-loaded sulfide collector BY-19 coupled with a low-alkalinity inhibitor BY-23, and sulfur concentrate is recovered by microbubble flotation using a BY-80 collector. The method has the advantages of significantly improving the recovery rate of copper concentrate Cu, avoiding the loss of valuable metals, being beneficial to improving process indicators, maximizing the comprehensive recovery rate of gold, and improving the gold recovery rate and sulfur recovery rate under the condition of consistent copper selection indicators.

Description

Technical Field

[0001] The present invention relates to the field of resource and environmental technology, and in particular to a coupled beneficiation method for high-sulfur-copper ratio gold-containing copper ores. Background Art

[0002] Copper is an important metallic element and is widely used in industrial manufacturing, construction, energy and other fields. Most of my country's copper resources are copper sulfide ores, which often coexist with pyrite. Secondary copper minerals are easily oxidized, which often produces copper ions in the flotation pulp, causing pyrite to be activated by copper ions, making copper and sulfur flotation separation difficult to achieve. Especially when the copper-sulfur ratio is high, the types of copper-containing minerals are many, and the embedded particle size is fine, the copper-sulfur separation problem caused by floatability and embedded characteristics is more prominent. Copper ores are often associated with gold, and extremely low grade and gold carried in multiple mineral phases are the main problems restricting gold recovery. In recent years, the large-scale development of copper mines has been an important trend, such as the Zijinshan Gold and Copper Mine, Duobaoshan Copper Mine, and Julong Copper Mine. However, there are many problems in the commonly used SABC process, which affects the recovery rate of the main process.

[0003] The beneficiation of gold-bearing copper ores with a high copper-sulfur ratio faces the following challenges: 1) The high sulfur-copper ratio, the wide variety of copper-bearing minerals, and the large difference in floatability lead to low copper-sulfur separation accuracy, long process, large reagent consumption, and low resource utilization; 2) The SABC process causes unstable stubborn rock content, high energy consumption for stubborn rock re-crushing, which accumulates over a long period of time and affects grinding efficiency, and fluctuations in the properties of the selected materials interfere with the main process; 3) It is difficult to accurately classify and recover extremely low-grade associated gold, and there has long been a problem of easy loss of gold in different mineral phases and occurrence states. It is difficult to effectively recover it by single gravity selection or single flotation; 4) The liquid level and flotation yield are unstable, and cannot respond quickly to changes in reagent dosage, resulting in large fluctuations in indicators.

[0004] Through searching, this research group has screened out the following literature related to the research content of this project: Beijing General Research Institute of Nonferrous Metals, “A Combined Process for the Recovery of Copper from Complex Copper-Sulfide Ore”, CN201510921061.6[P].2017-06-20; Zijin Mining Group Co., Ltd., “Ore Beneficiation Method for Low-Grade Copper Sulfide Ore”, CN201510789291.1[P].2016-01-27; Beijing General Research Institute of Nonferrous Metals, “A New Laboratory Grinding System”, CN201521042090.7[P].2016-0 8-10; Zijin Mining Group Co., Ltd., "A Flotation Process for Comprehensive Recovery and Utilization of Copper Tailings," CN201010614388.6 [P]. 2011-09-14; Beijing General Research Institute of Nonferrous Metals, "Selective Bioleaching Process for Secondary Copper Sulfide Ores with High Sulfur / Copper Ratio," CN201010163027.4 [P]. 2010-08-18; Zijin Mining Group Co., Ltd., "A Method for In-Situ Treatment of Flotation Tailings from Copper Sulfide Ores for Bio-Heap Leaching," CN202011135086.0 [P]. 2021-02-19. No reports with substantive content identical to this topic were found.

[0005] Therefore, it is of great significance to develop a coupled beneficiation method for high sulfur-copper ratio gold-containing copper ores. Summary of the Invention

[0006] The task of the present invention is to overcome the disadvantages and propose a coupled beneficiation method for high sulfur-copper ratio gold-containing copper ore.

[0007] The coupled beneficiation method for high sulfur-copper ratio gold-bearing copper ore is aimed at the high sulfur-copper ratio, multiple types of copper-bearing minerals, and large differences in floatability. The SABC process leads to low copper-sulfur separation accuracy, long process, large amount of reagents, low resource utilization, unstable stubborn stone amount, high energy consumption for stubborn stone re-crushing, long-term accumulation, affecting grinding efficiency and fluctuating properties of selected materials, interfering with the main process. It is difficult to classify and accurately recover extremely low-grade associated gold. There is a long-term problem of easy loss of gold in different mineral phases and occurrence states. It is difficult to effectively recover it by using single gravity separation or single flotation, and the liquid level and flotation yield are low. The SABC process solves the problems of unstable production, inability to quickly respond to changes in reagent dosage, and large fluctuations in indicators. The ore is graded by semi-autogenous grinding and ball milling, the semi-autogenous stone is enriched with copper by bioleaching, the Nelson process is used to directional enrich some coarse gold in the crushed product, the Nelson tailings are used to select copper by speed-differentiated asynchronous separation, the gold-loaded sulfide collector BY-19 is coupled with the low-alkalinity inhibitor BY-23 to enrich the fine gold into the copper concentrate, and the BY-80 collector is coupled with microbubble flotation to recover the sulfur concentrate, thereby improving the recovery rates of gold, copper and sulfur. The specific process steps and conditions are as follows:

[0008] S1. SAG-ball milling and classification, SAG stone enrichment of copper through bioleaching;

[0009] S2. Nielsen directional enrichment of coarse gold in crushed and ground products;

[0010] S3. Nelson tailings asynchronous copper separation;

[0011] S4. Gold-loaded sulfide collector BY-19 coupled with low-alkalinity inhibitor BY-23 enriches fine gold into copper concentrate;

[0012] S5.BY-80 collector coupled with microbubble flotation to recover sulfur concentrate.

[0013] Compared with the prior art, the present invention has the following advantages or effects:

[0014] Because of the adoption of differential-speed asynchronous copper selection, the recovery rate of Cu in copper concentrate has been significantly improved, thus avoiding the loss of valuable metals and facilitating the improvement of process indicators. At the same time, the activation of the Nelson system has achieved "early recovery and more recovery when possible", thus maximizing the comprehensive recovery rate of gold. In addition, due to the use of gold-loaded sulfide collector BY-19 and low-alkalinity reagents, the gold recovery rate has been improved while the copper selection indicators are basically the same. In addition, due to the mixing of "hard stone + wet process plant ore" into the pile for copper recovery and the use of BY-80 combination reagents, the sulfur recovery rate has been improved.

[0015] The SABC process flow involved in the application documents is a common mineral processing process flow in the industry. SA in the process flow stands for semi-autogenous grinding mill, C stands for stone crusher, and SABC represents the three main equipment and processes; BY is the reagent code, BY** stands for BY series reagents, and % refers to mass percentage unless otherwise specified. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention provides a schematic diagram of the processing flow of a coupled beneficiation technology for gold-containing copper ores with a high sulfur-copper ratio.

[0017] Figure 2 This is a schematic diagram of the operating process of a coupled mineral processing technology for high sulfur-copper ratio gold-containing copper ores provided by the present invention.

[0018] Figure 3 The figure is a schematic diagram of the original process for comparison with the present invention.

[0019] The present invention is described in further detail below with reference to the accompanying drawings. DETAILED DESCRIPTION

[0020] like Figures 1 to 3As shown, this high sulfur-copper ratio gold-bearing copper ore coupled beneficiation method is aimed at the high sulfur-copper ratio, many types of copper-bearing minerals, and large differences in floatability. The SABC process leads to low copper-sulfur separation accuracy, long process, large amount of reagents, low resource utilization, unstable stubborn stone amount, high energy consumption for stubborn stone re-crushing, long-term accumulation, affecting grinding efficiency and fluctuating properties of selected materials, interfering with the main process, making it difficult to classify and accurately recover extremely low-grade associated gold, and the problem of easy loss of gold in different mineral phases and occurrence states for a long time. It is difficult to effectively recover it by using single gravity separation and single flotation, liquid level and flotation. To solve the problems of unstable yield, inability to quickly respond to changes in reagent dosage, and large fluctuations in indicators, the SABC process is used to classify the ore through semi-autogenous grinding and ball milling, enrich the copper in the semi-autogenous grinding stone through bioleaching, Nelson directionally enrich some coarse gold in the crushed and ground products, Nelson tailings asynchronously select copper at different speeds, gold-loaded sulfide collector BY-19 coupled with low-alkalinity inhibitor BY-23 enrich fine gold into copper concentrate, and BY-80 collector coupled with microbubble flotation to recover sulfur concentrate, thereby improving the recovery rates of gold, copper, and sulfur. The specific process steps and conditions are as follows:

[0021] S1. SAG-ball milling and classification, SAG stone enrichment of copper through bioleaching;

[0022] S2. Nielsen directional enrichment of coarse gold in crushed and ground products;

[0023] S3. Nelson tailings asynchronous copper separation;

[0024] S4. Gold-loaded sulfide collector BY-19 coupled with low-alkalinity inhibitor BY-23 enriches fine gold into copper concentrate;

[0025] S5.BY-80 collector coupled with microbubble flotation to recover sulfur concentrate.

[0026] The process of the present invention may further be:

[0027] In the semi-autogenous grinding-ball milling classification in step S1, the classification fineness is -0.074mm60-90%.

[0028] In step S2, the feed concentration is 10-30%, the gravity value is 40G, the fluidization water volume is 1.0-5.0L / min, and the feed speed is 0.5-2kg / min.

[0029] The differential speed asynchronous copper separation in step S3 means that when the flotation grade is high, part of the copper rough concentrate directly enters the copper concentrate thickener, and enters the concentrating operation when the foam grade is unqualified.

[0030] In step S4, BY-80 refers to at least one of thiocarbamate, sodium ethyl xanthate and butyl ammonium nitropropane.

[0031] In step S4, BY-19 means that the mass fraction of (CH3)2CH(CH2)2CH(OCSS)CH3 is not less than 90%.

[0032] In step S4, BY-23 refers to a mixture of hydroxy polyacrylamide and carboxyl polyacrylamide, wherein the mass fraction of hydroxy polyacrylamide is not less than 50%.

[0033] In step S4, the amount of BY-19 used is 20-100 g / t, and the amount of BY-23 used is 20-100 g / t.

[0034] In step S5, BY-80 refers to at least one of thiocarbamate, sodium ethyl xanthate and butyl ammonium nitropropane.

[0035] The amount of BY-80 used in step S5 is 20-100 g / t.

[0036] If no specific techniques or conditions are specified in the examples, the experiments were carried out according to the techniques or conditions described in the literature in the field or according to the product instructions. If no manufacturer is specified for the reagents or instruments used, they are all conventional products that can be purchased through regular channels.

[0037] Example 1

[0038] In a high-sulfur gold-bearing copper mine, the types of copper minerals in the original ore are relatively complex, including secondary copper sulfide minerals (including chalcocite, covellite, bornite and sulfide-tin-zinc-copper ore, etc.) and primary copper sulfide minerals (including sulfide-arsenic copper ore, chalcopyrite, tetrahedrite-tellurite); gold is mainly native gold; silver minerals include tellurium-gold-silver ore and tellurium-silver ore; other sulfide minerals are mainly pyrite. The gangue minerals are mainly quartz, followed by clay-like dickite and sulfate mineral alunite. The ore contains 0.47% copper, 0.12g / t gold, and 3.62% sulfur. Figure 2 In the semi-autogenous grinding and ball milling classification process, the classification fineness is -0.074 mm 60; the Nielsen feed concentration is 20%, the gravity value is 40g, the fluidizing water volume is 1.0L / min, and the feed rate is 1kg / min. BY-19 for the asynchronous copper separation is 90% (CH3)2CH(CH2)2CH(OCSS)CH3 by mass; BY-23 hydroxypolyacrylamide is 50% by mass; the BY-19 dosage is 20g / t; the BY-23 dosage is 20g / t; BY-80 is a mixture of sodium ethyl xanthate and butyl ammonium black powder in a mass ratio of 1:1, with a total dosage of 50g / t. The traditional process uses a closed-circuit stone process; copper flotation is performed in a single step; BY-19 is not added, only lime is used; butyl xanthate is used for sulfur separation, and Nielsen is not used in the front end.

[0039] The overall technology of the present invention can increase the copper recovery rate by approximately 3.03 percentage points, the gold recovery rate by 6.85 percentage points, and the sulfur recovery rate by 13.52 percentage points when the sulfur concentrate grade is increased by 4.29 percentage points.

[0040] Example 2

[0041] In a high-sulfur gold-bearing copper mine, the types of copper minerals in the original ore are relatively complex, including secondary copper sulfide minerals (including chalcocite, covellite, bornite and sulfide-tin-zinc-copper ore, etc.) and primary copper sulfide minerals (including sulfide-arsenic copper ore, chalcopyrite, tetrahedrite-tellurite); gold is mainly native gold; silver minerals include tellurium-gold-silver ore and tellurium-silver ore; other sulfide minerals are mainly pyrite. The gangue minerals are mainly quartz, followed by clay-like dickite and sulfate mineral alunite. The ore contains 0.40% copper, 0.08g / t gold, and 3.52% sulfur. Figure 2 In the semi-autogenous grinding and ball milling classification process, the classification fineness is -0.074mm 65; the Nielsen feed concentration is 30%, the gravity value is 40g, the fluidizing water volume is 2.0L / min, and the feed rate is 1kg / min. BY-19 for the differential-speed asynchronous copper separation is 90% (CH3)2CH(CH2)2CH(OCSS)CH3 by mass; BY-23 hydroxypolyacrylamide is 50% by mass; the BY-19 dosage is 15g / t; the BY-23 dosage is 15g / t; BY-80 is a mixture of sodium ethyl xanthate and butyl ammonium black powder in a mass ratio of 1:1, with a total dosage of 40g / t. The traditional process uses a closed-circuit stone process; copper flotation is performed in a single step; BY-19 is not added, only lime is used; butyl xanthate is used for sulfur separation, and Nielsen is not used in the front end.

[0042] The overall technology of the present invention can increase the copper recovery rate by approximately 3.06 percentage points, the gold recovery rate by 6.88 percentage points, and the sulfur recovery rate by 13.53 percentage points when the sulfur concentrate grade is increased by 4.31 percentage points.

[0043] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification. For the method embodiments, for the sake of simplicity of description, they are all expressed as a series of action combinations, but those skilled in the art should know that the present invention is not limited to the order of the actions described, because according to the present invention, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and components involved are not necessarily necessary for the present invention.

[0044] The above is a detailed introduction to the coupled beneficiation method for high-sulfur-copper-ratio gold-containing copper ore provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

[0045] Table 1 Comparison of indicators between the process of the present invention and the traditional process in Example 1

[0046]

[0047] As described above, the present invention can be better implemented. The above embodiments are only the best implementation methods of the present invention, but the implementation methods of the present invention are not limited to the above embodiments. Other changes, modifications, replacements, combinations, and simplifications made without departing from the spirit and principles of the present invention should be considered equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A coupled beneficiation method for high sulfur-copper ratio gold-bearing copper ores, characterized in that The SABC process uses semi-autogenous grinding and ball milling to classify the ore. The semi-autogenous grinding stone is used to enrich the copper in it through bioleaching. The Nelson tailings are used to directionally enrich some coarse gold in the crushed product. The Nelson tailings are used to select copper by differential speed asynchronous separation. The gold-loaded sulfide collector BY-19 is coupled with the low-alkalinity inhibitor BY-23 to enrich the fine gold into the copper concentrate. The BY-80 collector is coupled with microbubble flotation to recover the sulfur concentrate, thereby improving the recovery rates of gold, copper and sulfur. The specific process steps and conditions are as follows: S1. SAG-ball milling and classification, SAG stone enrichment of copper through bioleaching; S2. Nielsen directional enrichment of coarse gold in crushed and ground products; S3. Nelson tailings are asynchronously selected for copper separation at different speeds. When the flotation grade is high, some of the copper concentrate is directly fed into the copper concentrate thickener. When the flotation grade is unqualified, it enters the concentrating operation. S4. The gold-loaded sulfide collector BY-19 is coupled with the low-alkalinity inhibitor BY-23 to enrich fine gold into copper concentrate. BY-19 refers to (CH3)2CH(CH ２ ) ２ The mass fraction of CH(OCSS)CH3 is not less than 90%. BY-23 refers to a mixture of hydroxy polyacrylamide and carboxyl polyacrylamide, wherein the mass fraction of hydroxy polyacrylamide is not less than 50%. S5. BY-80 collector coupled with microbubble flotation to recover sulfur concentrate, BY-80 refers to at least one of thiocarbamate, sodium ethyl xanthate and butyl ammonium black medicine.

2. The method according to claim 1, wherein In the semi-autogenous grinding-ball milling classification in step S1, the classification fineness is -0.074mm 60-90%.

3. The method according to claim 1, wherein In step S2, the feed concentration is 10-30%, the gravity value is 40G, the fluidizing water volume is 1.0-5.0L / min, and the feed speed is 0.5-2kg / min.

4. The method according to claim 1, wherein In step S4, the amount of BY-19 used is 20-100 g / t, and the amount of BY-23 used is 20-100 g / t.

5. The method according to claim 1, wherein The amount of BY-80 used in step S5 is 20-100 g / t.

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