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

Abstract

The invention discloses a coupling beneficiation method for gold-bearing copper ore with a high sulfur-copper ratio. Ore existing in an SABC process is subjected to semi-autogenous grinding-ball-milling ore grinding classification, semi-autogenous grinding hard rock is subjected to biological leaching to enrich copper in the ore, a part of coarse-grain gold in a product is directionally enriched and ground through Nelson, and Nelson tailings are subjected to different-speed asynchronous copper separation; a gold-loaded sulfide collecting agent BY-19 is coupled with a low-alkalinity inhibitor BY-23 to enrich micro-fine particle gold into copper concentrate, a BY-80 collecting agent is coupled with microbubble flotation to recover sulfur concentrate, the recovery rate of gold, copper and sulfur is increased, and the method specifically comprises the steps that semi-autogenous grinding-ball milling ore grinding classification is conducted, and copper in semi-autogenous grinding hard rock is enriched through biological leaching; performing Nelson directional enrichment on part of coarse-grained gold in the ground product; carrying out different-speed asynchronous copper separation on the Nelson tailings; a gold-loaded sulfide collecting agent BY-19 is coupled with a low-alkalinity inhibitor BY-23 to enrich micro-fine particle gold into copper concentrate; and sulfur concentrate is recovered through BY-80 collecting agent coupling microbubble flotation. The method has the advantages that the recovery rate of Cu in the copper concentrate can be remarkably increased, loss of valuable metal is avoided, technological indexes are improved, the comprehensive recovery rate of gold is increased to the maximum extent, and the gold recovery rate and the operation recovery rate of sulfur are increased under the condition that the copper selection indexes are consistent.

Description

Technical Field

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

[0002] Copper is an important metal 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, so copper ions are often produced in the flotation slurry, causing pyrite to be activated by copper ions, making it difficult to achieve copper-sulfur flotation separation. 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 multiple mineral phases carrying gold are the main problems restricting gold recovery. In recent years, the large-scale development of copper mines has been an important trend, such as Zijinshan Gold and Copper Mine, Duobaoshan Copper Mine, Julong Copper Mine, etc., and there are many problems in their commonly used SABC process, which affects the recovery rate of the main process.

[0003] The beneficiation of high copper-sulfur ratio gold-containing copper ores faces the following challenges: 1) The high sulfur-copper ratio, multiple types of copper-containing minerals, and large differences in floatability lead to low copper-sulfur separation accuracy, long process, large amount of reagents, and low resource utilization; 2) The SABC process has unstable stubborn rock content, high energy consumption for stubborn rock re-crushing, and long-term accumulation affects the grinding efficiency and fluctuates in the properties of the selected materials, interfering with the main process; 3) It is difficult to classify and accurately 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 through single gravity separation and single flotation; 4) The liquid level and flotation yield are unstable, and it is impossible to respond quickly to changes in reagent dosage, and the indicators fluctuate greatly.

[0004] Through searching, this research group screened out the following literature related to the research content of this project: Beijing Nonferrous Metals Research Institute "A complex copper-sulfide ore recovery copper beneficiation combined treatment process", CN201510921061.6[P].2017-06-20; Zijin Mining Group Co., Ltd. "Ore dressing method for low-grade sulfide copper ore" CN201510789291.1[P].2016-01-27; Beijing Nonferrous Metals Research Institute "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 Nonferrous Metals Research Institute "Selective bioleaching process for secondary sulfide copper ore 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 of sulfide copper ore for bio-heap leaching" CN202011135086.0[P].2021-02-19. No reports with the same substantive content as 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, 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, and making it 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 single gravity separation and single flotation, and the liquid level and flotation yield are high. The SABC process is used to classify the ore through semi-autogenous grinding and ball milling, and the semi-autogenous stone is used to enrich the copper in the ore through biological leaching. The Nelson tailings are used to selectively enrich the coarse gold in the crushed product. The Nelson tailings are used to select copper asynchronously at different speeds. 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, so as to improve the recovery rate of gold, copper and sulfur. The specific process steps and conditions are as follows:

[0008] S1. Semi-autogenous grinding-ball milling classification, semi-autogenous grinding stone is enriched with copper through bioleaching;

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

[0010] S3. Nelson tailings speed 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 use of differential speed asynchronous copper selection, the recovery rate of Cu in copper concentrate is significantly improved, so the loss of valuable metals is avoided, which is conducive to improving process indicators; at the same time, due to the activation of the Nelson system, "early recovery and more recovery" are achieved, so the comprehensive recovery rate of gold is maximized; in addition, due to the use of gold-loaded sulfide collector BY-19 and low-alkalinity reagents, the gold recovery rate is improved when the copper selection indicators are basically the same; in addition, due to the mixing of "stubborn stone + wet process plant ore" into the pile to recover copper and the use of BY-80 combined reagents, the sulfur recovery rate is improved.

[0015] The SABC process involved in the application document is a common mineral processing process in the industry. SA in the process stands for semi-autogenous grinding mill, C stands for stone crusher, and SABC stands for 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 mineral processing technology for gold-containing copper ores with a high sulfur-to-copper ratio.

[0017] Figure 2 A schematic diagram of the operation flow of a coupled mineral processing technology for high sulfur-copper ratio gold-containing copper ore provided by the present invention.

[0018] Figure 3 It is the original process schematic diagram for comparison with the present invention.

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

[0020] like Figures 1 to 3As shown in the figure, the coupled beneficiation method of high sulfur-copper ratio gold-containing copper ore is aimed at the high sulfur-copper ratio, many types of copper-containing minerals, large differences in floatability, low copper-sulfur separation accuracy, long process, large amount of reagents, low resource utilization rate, 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 single gravity separation and single flotation, liquid level and flotation. The problems of unstable yield, inability to respond quickly to changes in dosage, and large fluctuations in indicators can be solved by using the SABC process. The ore is graded by semi-autogenous grinding and ball milling, the semi-autogenous stone is enriched with copper by bioleaching, the Nelson tailings are selectively enriched with coarse gold, the Nelson tailings are asynchronously selected for copper, 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, so as to improve the recovery rates of gold, copper and sulfur. The specific process steps and conditions are as follows:

[0021] S1. Semi-autogenous grinding-ball milling classification, semi-autogenous grinding stone is enriched with copper through bioleaching;

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

[0023] S3. Nelson tailings speed 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 fluidized water volume is 1.0-5.0L / min, and the feed speed is 0.5-2kg / min.

[0029] The step S3 of asynchronous copper separation by different speeds means that part of the copper rough concentrate directly enters the copper concentrate thickener when the flotation grade is high, and enters the concentration operation when the froth grade is unqualified.

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

[0031] In the 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 black medicine.

[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 techniques or conditions described in the literature in the field or the product instructions are used. 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] A high-sulfur gold-bearing copper mine has a complex variety of copper minerals in the original ore, including secondary copper sulfide minerals (including chalcocite, covellite, bornite, and tin-zinc-copper sulfide) and primary copper sulfide minerals (including arsenic-sulfur 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-ball milling classification, the classification fineness is -0.074mm 60; the Nielsen feed concentration is 20%, the gravity value is 40G, the fluidized water volume is 1.0L / min, and the feed speed is 1kg / min; the speed-differential asynchronous copper selection BY-19 refers to the mass fraction of (CH3)2CH(CH2)2CH(OCSS)CH3 is 90%; the mass fraction of BY-23 hydroxy polyacrylamide is 50%; the dosage of BY-19 is 20g / t; the dosage of BY-23 is 20g / t; BY-80 is a mixture of sodium ethyl xanthate and butyl ammonium black medicine, the mass ratio is 1:1, and the total dosage is 50g / t. In the traditional process, the stubborn stone is closed; copper is flotated in one step; BY-19 is not added, only lime is used; butyl xanthate is used for sulfur selection, and Nielsen is not used at the front end.

[0039] The overall technology of the present invention can increase the copper recovery rate by about 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] A high-sulfur gold-bearing copper mine has a complex variety of copper minerals in the original ore, including secondary copper sulfide minerals (including chalcocite, covellite, bornite, and tin-zinc-copper sulfide) and primary copper sulfide minerals (including arsenic-sulfur 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-ball milling classification, the classification fineness is -0.074mm 65; the Nielsen feed concentration is 30%, the gravity value is 40G, the fluidized water volume is 2.0L / min, and the feed speed is 1kg / min; the speed-differential asynchronous copper selection BY-19 refers to the mass fraction of (CH3)2CH(CH2)2CH(OCSS)CH3 is 90%; the mass fraction of BY-23 hydroxy polyacrylamide is 50%; the dosage of BY-19 is 15g / t; the dosage of BY-23 is 15g / t; BY-80 is a mixture of sodium ethyl xanthate and butyl ammonium black medicine, the mass ratio is 1:1, and the total dosage is 40g / t. In the traditional process, the stubborn stone is closed; copper is flotated in one step; BY-19 is not added, only lime is used; butyl xanthate is used for sulfur selection, and Nielsen is not used at the front end.

[0042] The overall technology of the present invention can increase the copper recovery rate by about 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 simple 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 described order of actions, because according to the present invention, some 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 required by the present invention.

[0044] The above is a detailed introduction to the coupled beneficiation method of a high sulfur-to-copper ratio gold-containing copper ore provided by the present invention. Specific examples are used in this article to illustrate the principle and implementation method 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 idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on 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 by the above embodiments. Other changes, modifications, replacements, combinations, and simplifications made without departing from the spirit and principle of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A coupled beneficiation method for high sulfur-copper ratio gold-containing copper ore, which is aimed at the high sulfur-copper ratio, many types of copper-containing minerals, large differences in floatability, 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 fluctuation of selected material properties interfering with the main process, making it difficult to classify and accurately recover extremely low-grade associated gold, and the long-term existence of the problem that gold in different mineral phases and occurrence states is easy to lose, and it is difficult to effectively recover it by single gravity separation and single flotation, the liquid level and flotation yield are unstable, and it is impossible to quickly respond to changes in reagent dosage, and the index fluctuates greatly. It is characterized by The SABC process uses semi-autogenous grinding and ball milling to classify the existing ore, semi-autogenous grinding stone is used to enrich the copper in it through bioleaching, Nelson directionally enriches part of the coarse gold in the crushed product, Nelson tailings are asynchronously selected for copper, gold-loaded sulfide collector BY-19 is coupled with low alkalinity inhibitor BY-23 to enrich fine gold into copper concentrate, BY-80 collector is coupled with microbubble flotation to recover sulfur concentrate, and the recovery rates of gold, copper and sulfur are improved. The specific process steps and conditions are as follows: S1. Semi-autogenous grinding-ball milling classification, semi-autogenous grinding stone is enriched with copper through bioleaching; S2. Nielsen directional enrichment of part of the coarse gold in the crushed and ground products; S3. Nelson tailings speed asynchronous copper separation; S4. Gold-loaded sulfide collector BY-19 coupled with low-alkalinity inhibitor BY-23 enriches fine gold into copper concentrate; S5.BY-80 collector coupled with microbubble flotation to recover sulfur concentrate.

2. The method according to claim 1, characterized in that 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, characterized in that 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, characterized in that The speed-differential asynchronous copper selection 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 concentration operation when the froth grade is unqualified.

5. The method according to claim 1, characterized in that In step S4, BY-80 refers to at least one of thiocarbamate, sodium ethyl xanthate and butyl ammonium black medicine.

6. The method according to claim 1, characterized in that In the step S4, BY-19 means that the mass fraction of (CH3)2CH(CH2)2CH(OCSS)CH3 is not less than 90%.

7. The method according to claim 1, characterized in that 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%.

8. The method according to claim 1, 6 or 7, characterized in that 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.

9. The method according to claim 1, characterized in that In step S5, BY-80 refers to at least one of thiocarbamate, sodium ethyl xanthate and butyl ammonium black medicine.

10. The method according to claim 1 or 9, characterized in that The amount of BY-80 used in step S5 is 20-100 g / t.

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