System for improving comprehensive recovery rate of refractory gold ore

Abstract

The utility model discloses a system for improving the comprehensive recovery rate of refractory gold ore, which comprises ore grinding equipment, material grading equipment, leaching equipment and tailing treatment equipment of which the upper-stage outlet and the lower-stage inlet are sequentially communicated, and also comprises alkaline leaching equipment and solid-liquid separation equipment which are positioned between the material grading equipment and the leaching equipment. Therefore, grinding of gold-containing products, silver, lead and zinc ore materials, oxidation pretreatment before gold and silver leaching and flotation of lead and zinc in leached tailings can be achieved, gold and silver are separated, lead and zinc concentrate is obtained, and the gold and silver leaching rate is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of ore dressing, in particular to a system for improving the comprehensive recovery rate of refractory gold ores. Background Art

[0002] The leaching of gold refers to exposing gold minerals by crushing ores or oxidizing carrier minerals, and then leaching the gold with gold leaching agents in the leaching solution. After leaching, solid-liquid separation is carried out, and the dissolved gold is precipitated from the solution, or adsorbed from the pulp onto a certain added solid, or transferred from the solution to a liquid, and finally the gold is recovered from this phase.

[0003] Refractory gold ores can be divided into complex polymetallic sulfide ores, carbonaceous ores, telluride ores, etc. The gold particles in complex polymetallic sulfide ores are small and are wrapped by sulfide minerals and cannot contact the leaching solution. The high contents of impurities such as sulfur, arsenic, and antimony have an adverse effect on the cyanidation of gold. Studying economically applicable methods for treating such gold ores has high technical significance.

[0004] Currently, when treating refractory gold ores, complex technical processes must be adopted in production. In addition, there will be a large degree of resource waste, the leaching rate of gold is low, the dosage of leaching agents is large, and the actual production cost is increased. Summary of the Utility Model

[0005] To solve the technical problems in the background art, the utility model proposes a system for improving the comprehensive recovery rate of refractory gold ores.

[0006] The system for improving the comprehensive recovery rate of refractory gold ores proposed by the utility model includes a grinding device, a material classification device, a leaching device, and a tailing treatment device with their upper-level outlet and lower-level inlet connected in sequence, and also includes an alkali leaching device and a solid-liquid separation device located between the material classification device and the leaching device.

[0007] Preferably, the grinding device is used for grinding materials, its feed inlet is connected to a feeder, and its discharge outlet is connected to the feed inlet of the material classification device. The material classification device is a hydrocyclone for classifying the ground materials, the underflow material returns to the grinding device for continuous grinding, and the overflow is connected to the feed inlet of the alkali leaching device. The alkali leaching device is used for oxidative pretreatment of the overflow material of the hydrocyclone, and its discharge outlet is connected to the feed inlet of the solid-liquid separation device. The solid-liquid separation device is used for dehydrating the alkali leached pulp, and its discharge outlet is connected to the leaching device. The leaching device consists of a series of stirring tanks, and the dehydrated material enters the stirring tanks for pulp adjustment. The discharge outlet of the leaching device is connected to the tailing treatment device.

[0008] Preferably, the grinding device is a ball mill.

[0009] Preferably, the tailings treatment equipment includes a lead-zinc roughing flotation machine, a lead-zinc first cleaning flotation machine, a lead-zinc second cleaning flotation machine, a lead-zinc first scavenging flotation machine, and a lead-zinc second scavenging flotation machine. The feed inlet of the lead-zinc roughing flotation machine is connected to the tailings outlet of the leaching equipment, and the concentrate discharge port is connected to the feed inlet of the lead-zinc first cleaning flotation machine. The tailings outlet of the lead-zinc first cleaning flotation machine is connected to the feed inlet of the lead-zinc roughing flotation machine. The concentrate discharge port of the lead-zinc first cleaning flotation machine is connected to the feed inlet of the lead-zinc second cleaning flotation machine. The lead-zinc concentrate is obtained from the concentrate discharge port of the lead-zinc second cleaning flotation machine, and the tailings outlet of the lead-zinc second cleaning flotation machine is connected to the feed inlet of the lead-zinc first cleaning flotation machine. The tailings outlet of the lead-zinc roughing flotation machine is connected to the feed inlet of the lead-zinc first scavenging flotation machine. The concentrate discharge port of the lead-zinc first scavenging flotation machine is connected to the feed inlet of the lead-zinc roughing flotation machine. The tailings outlet of the lead-zinc first scavenging flotation machine is connected to the feed inlet of the lead-zinc second scavenging flotation machine. The concentrate discharge port of the lead-zinc second scavenging flotation machine is connected to the feed inlet of the lead-zinc first scavenging flotation machine. The final tailings are discharged from the tailings outlet of the lead-zinc second scavenging flotation machine.

[0010] Preferably, the material classification equipment consists of two sets of hydrocyclones. The underflow of the first-stage hydrocyclone returns to the ball mill for regrinding, and the overflow enters the second-stage hydrocyclone. The underflow of the second-stage hydrocyclone returns to the ball mill for regrinding, and the overflow port is connected to the feed inlet of the alkali leaching equipment.

[0011] Preferably, the probability of the qualified material particle size being -0.038 mm after passing through the material classification equipment is 92%.

[0012] Preferably, the pulp concentration in the alkali leaching equipment is 35%, the pH value is 12, and the alkali leaching time is 8 h.

[0013] Preferably, the pulp concentration in the leaching equipment is 32%, the pH value is 11, and the leaching time is 38 h.

[0014] In summary, the present utility model has the following beneficial effects: Through the combined design of the grinding equipment, material classification equipment, alkali leaching equipment, solid-liquid separation equipment, leaching equipment, and tailings treatment equipment, it is possible to grind, screen, pre-treat by alkali leaching, leach, and flotation recover lead and zinc from the gold tailings of high-sulfur refractory gold ore materials, improve the gold and silver leaching rates, effectively recover the lead and zinc ores in the leaching tailings, and further recover the un-leached gold and silver in the gold and silver leaching residues. Among them, the operating recovery rate of lead can reach 72%, the grade of zinc is 36.02%, the operating recovery rate of lead can reach 68%, the grade of lead is 14.86%, the comprehensive recovery rate of gold is over 94%, and the comprehensive recovery rate of silver is over 86%. It can realize the grinding of gold, silver, lead, and zinc ore materials, the oxidative pretreatment before gold and silver leaching, and the flotation of lead and zinc in the leaching tailings, so as to separate gold and silver and obtain lead and zinc concentrates, and improve the gold and silver leaching rates.

[0015] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural flow chart of a system for improving the comprehensive recovery rate of refractory gold ore in an embodiment of the present utility model.

[0017] In the figure:

[0018] 1. Grinding equipment; 2. Material classification equipment; 21. First-stage hydrocyclone; 22. Second-stage hydrocyclone; 3. Alkali leaching equipment; 4. Solid-liquid separation equipment; 5. Leaching equipment; 6. Tailings treatment equipment; 61. Lead-zinc roughing flotation machine; 62. First-stage lead-zinc cleaning flotation machine; 63. Second-stage lead-zinc cleaning flotation machine; 64. First-stage lead-zinc scavenging flotation machine; 65. Second-stage lead-zinc scavenging flotation machine. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar symbols represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0020] As Figure 1 shown, a system for improving the comprehensive recovery rate of refractory gold ore proposed in this embodiment includes a grinding equipment 1, a material classification equipment 2, a leaching equipment 5, and a tailings treatment equipment 6 with their upper-level outlets and lower-level inlets connected in sequence, and also includes an alkali leaching equipment 3 and a solid-liquid separation equipment 4 located between the material classification equipment 2 and the leaching equipment 5.

[0021] In this way, through the combined design of the grinding equipment 1, the material classification equipment 2, the alkali leaching equipment 3, the solid-liquid separation equipment 4, the leaching equipment 5, and the tailings treatment equipment 6, it is possible to grind, screen, pre-treat by alkali leaching, leach, and flotation recover lead and zinc from the gold tailings of high-sulfur refractory gold ore materials, improve the gold and silver leaching rates, effectively recover the lead and zinc ores in the leaching tailings, and the gold and silver that are not leached in the gold and silver leaching residues can also be further recovered. Among them, the operating recovery rate of lead can reach 72%, the grade of zinc is 36.02%, the operating recovery rate of lead can reach 68%, the grade of lead is 14.86%, the comprehensive recovery rate of gold is over 94%, and the comprehensive recovery rate of silver is over 86%, realizing the comprehensive utilization of resources and improving the comprehensive recovery rate of gold ore.

[0022] On the other hand, compared with ordinary leaching, an alkali leaching equipment 3 and a solid-liquid separation equipment 4 are added. After solid-liquid separation, Fe generated from metal sulfide ores during alkali leaching can be removed2+ , Cu 2+ , Zn 2+ , Pb 2+ Some metal ions can reduce the formation of a thin film formed by the complex on the surfaces of gold and silver particles, improve the contact between gold and silver and the leaching agent, and reduce the consumption of the leaching agent and dissolved oxygen in the pulp by associated minerals.

[0023] Furthermore, the grinding equipment 1 is used for grinding materials, the feed inlet is connected to a feeder (the feeder sends materials into the feed inlet of the grinding equipment through a belt), the discharge outlet is connected to the feed inlet of the material classification equipment 2. The material classification equipment 2 is a hydrocyclone used for classifying the ground materials. Its underflow materials are returned to the grinding equipment 1 for continuous grinding, and the overflow is connected to the feed inlet of the alkali leaching equipment 3. The alkali leaching equipment 3 is used for oxidative pretreatment of the overflow materials of the hydrocyclone. Its discharge outlet is connected to the feed inlet of the solid-liquid separation equipment 4. The solid-liquid separation equipment 4 is used for dewatering the alkali leached pulp. Its discharge outlet is connected to the leaching equipment 5. The leaching equipment 5 consists of a series of stirring tanks. The dewatered materials enter the stirring tanks for pulp preparation. The discharge outlet of the leaching equipment 5 is connected to the tailing treatment equipment 6.

[0024] Even further, the grinding equipment 1 is a ball mill. Specifically, the grinding equipment 1 is an overflow ball mill, and the grinding concentration is 65%.

[0025] Among them, the discharge outlet of the grinding equipment 1 is connected to the feed inlet of the hydrocyclone. The discharge of the grinding equipment 1 is transported to the material classification equipment 2 through a pipeline by a slurry pump. The material classification equipment 2 consists of two groups of hydrocyclones. The underflow of the first-stage hydrocyclone 21 returns to the ball mill for re-grinding, and the overflow enters the second-stage hydrocyclone (22). The underflow of the second-stage hydrocyclone 22 returns to the ball mill for re-grinding, and the overflow outlet is connected to the feed inlet of the alkali leaching equipment 3. Specifically, the probability of the qualified material particle size being -0.038 mm after passing through the material classification equipment 2 is 92%.

[0026] In this embodiment, the pulp concentration in the alkali leaching equipment 3 is 35%, the pH value is 12, and the alkali leaching time is 8 h. That is, the alkali leaching equipment 3 performs 8 h of oxidative pretreatment on the materials under the conditions of a pulp concentration of 35% and a pulp pH of 12, oxidizes the surfaces of some particles of the gold and silver-bearing ore to expose the gold and silver so that they can contact the leaching agent in the subsequent leaching process, thereby improving the leaching rate of gold and silver. The alkali leached pulp enters the solid-liquid separation equipment 4 through a pipeline by a slurry pump for dewatering to remove Fe generated by metal sulfide ores during the alkali leaching process. 2+ , Cu 2+ , Zn 2+ , Pb 2+Partial metal ions reduce the formation of a thin film formed by the complex on the surfaces of gold and silver particles, improve the contact between gold and silver and the leaching agent, and can reduce the consumption of the leaching agent and dissolved oxygen in the pulp by associated minerals.

[0027] Further, the leaching device 5 consists of a series of agitation tanks. The dehydrated material enters the pulp agitation tank for pulp adjustment. The pulp concentration is 32% and the pH value is 11. The discharge port of the pulp agitation tank is connected to the feed port of the leaching tank. The pulp is transported to the leaching tank through a pipeline for leaching for 38 h. The tailing port of the leaching tank is connected to the feed port of the tailing treatment device 6.

[0028] Furthermore, the tailing treatment device 6 includes a lead-zinc roughing flotation machine 61, a lead-zinc first cleaning flotation machine 62, a lead-zinc second cleaning flotation machine 63, a lead-zinc first scavenging flotation machine 64, and a lead-zinc second scavenging flotation machine 65. The feed port of the lead-zinc roughing flotation machine 61 is connected to the tailing port of the leaching device 5. The concentrate discharge port is connected to the feed port of the lead-zinc first cleaning flotation machine 62. The tailing port of the lead-zinc first cleaning flotation machine 62 is connected to the feed port of the lead-zinc roughing flotation machine 61. The concentrate discharge port of the lead-zinc first cleaning flotation machine 62 is connected to the feed port of the lead-zinc second cleaning flotation machine 63. The lead-zinc concentrate is obtained from the concentrate discharge port of the lead-zinc second cleaning flotation machine 63. The tailing port of the lead-zinc second cleaning flotation machine 63 is connected to the feed port of the lead-zinc first cleaning flotation machine 62. The tailing port of the lead-zinc roughing flotation machine 61 is connected to the feed port of the lead-zinc first scavenging flotation machine 64. The concentrate discharge port of the lead-zinc first scavenging flotation machine 64 is connected to the feed port of the lead-zinc roughing flotation machine 61. The tailing port of the lead-zinc first scavenging flotation machine 64 is connected to the feed port of the lead-zinc second scavenging flotation machine 65. The concentrate discharge port of the lead-zinc second scavenging flotation machine 65 is connected to the feed port of the lead-zinc first scavenging flotation machine 64. The final tailings are discharged from the tailing port of the lead-zinc second scavenging flotation machine 65.

[0029] In summary, through the combined design of the grinding device 1, the material classification device 2, the alkali leaching device 3, the solid-liquid separation device 4, the leaching device 5, and the tailing treatment device 6, it is possible to grind, screen, pre-treat by alkali leaching, leach, and flotation recover lead and zinc from the gold and silver leaching tailings of high-sulfur refractory gold ore materials, and obtain lead-zinc concentrate (containing gold and silver). Compared with the general leaching process, the leaching rate of gold is increased by 4 percentage points, the leaching rate of silver is increased by 8 percentage points, and the consumption of the leaching agent is reduced by 2 kg / t. The lead-zinc ore in the leaching tailings can be effectively recovered, and the un-leached gold and silver in the gold and silver leaching residues can also be further recovered. Among them, the zinc operation recovery rate can reach 72%, the zinc grade is 36.02%, the lead operation recovery rate can reach 68%, the lead grade is 14.86%, the comprehensive recovery rate of gold is more than 94%, and the comprehensive recovery rate of silver is more than 86%. The comprehensive utilization of resources is realized and the cost of beneficiation reagents is reduced, thereby improving the beneficiation efficiency.

[0030] This system improves the leaching rates of gold and silver through pre-oxidation pretreatment before leaching. Lead and zinc in the leaching residue are recovered by flotation. The un-leached gold and silver in the leaching residue can also be recovered by the flotation of lead and zinc, realizing the further recovery of gold and silver, and thus improving the overall metal recovery rate of refractory gold ores. The overall recovery rate of gold is over 94%, and the overall recovery rate of silver is over 86%. It is mainly used for the separation of refractory gold ore materials containing gold, silver, lead, and zinc.

[0031] It should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0032] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0035] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent substitutions or changes, and should be covered within the protection scope of the present utility model.

Claims

1. A system for improving the comprehensive recovery rate of refractory gold ore, comprising a grinding device (1), a material classification device (2), a leaching device (5) and a tailings treatment device (6) whose upper outlet and lower inlet are sequentially connected, characterized in that: It also includes an alkali leaching device (3) and a solid-liquid separation device (4) located between the material classification device (2) and the leaching device (5).

2. The system for improving the comprehensive recovery rate of refractory gold ore according to claim 1, characterized in that: The grinding equipment (1) is used for grinding materials, the feed port is connected to a feeder, and the discharge port is connected to the feed port of the material classification equipment (2); the material classification equipment is configured as a hydrocyclone for classifying the ground materials, the underflow materials thereof are returned to the grinding equipment (1) for further grinding, and the overflow is connected to the feed port of the alkali leaching equipment (3); the alkali leaching equipment (3) is used for oxidative pretreatment of the overflow materials of the hydrocyclone, and the discharge port is connected to the feed port of the solid-liquid separation equipment (4); the solid-liquid separation equipment (4) is used for dehydrating the alkali leached slurry, and the discharge port is connected to the leaching equipment (5); the leaching equipment (5) is composed of a series of stirring tanks, and the dehydrated materials enter the stirring tanks for slurry adjustment; the discharge port of the leaching equipment (5) is connected to the tailings treatment equipment (6).

3. The system for improving the comprehensive recovery rate of refractory gold ore according to claim 2, characterized in that: The grinding equipment (1) is configured as a ball mill.

4. The system for improving the comprehensive recovery rate of refractory gold ore according to claim 2, characterized in that: The tailings treatment equipment (6) comprises a lead-zinc roughing flotation machine (61), a lead-zinc concentrating flotation machine (62), a lead-zinc concentrating flotation machine (63), a lead-zinc scavenging flotation machine (64), and a lead-zinc scavenging flotation machine (65). The feed inlet of the lead-zinc roughing flotation machine (61) is connected to the tailings port of the leaching equipment (5), the concentrate discharge port is connected to the feed inlet of the lead-zinc concentrating flotation machine (62), the tailings port of the lead-zinc concentrating flotation machine (62) is connected to the feed inlet of the lead-zinc roughing flotation machine (61), the concentrate discharge port of the lead-zinc concentrating flotation machine (62) is connected to the feed inlet of the lead-zinc roughing flotation machine (61), the concentrate discharge port of the lead-zinc concentrating flotation machine (62) is connected to the feed inlet of the lead-zinc concentrating flotation machine (63), and the lead-zinc concentrating flotation machine (63) is connected to the feed inlet of the lead-zinc concentrating flotation machine (63). The concentrate discharge port obtains lead-zinc concentrate, the tailings port of the lead-zinc selective flotation machine (63) is connected to the feed port of the lead-zinc selective flotation machine (62); the tailings port of the lead-zinc roughing flotation machine (61) is connected to the feed port of the lead-zinc scavenging flotation machine (64), the concentrate discharge port of the lead-zinc scavenging flotation machine (64) is connected to the feed port of the lead-zinc roughing flotation machine (61), the tailings port of the lead-zinc scavenging flotation machine (64) is connected to the feed port of the lead-zinc scavenging flotation machine (65), the concentrate discharge port of the lead-zinc scavenging flotation machine (65) is connected to the feed port of the lead-zinc scavenging flotation machine (64), and the tailings port of the lead-zinc scavenging flotation machine (65) discharges the final tailings.

5. The system for improving the comprehensive recovery rate of refractory gold ore according to claim 3, characterized in that: The material classification equipment (2) is composed of two groups of hydrocyclones; the bottom flow of the first hydrocyclone (21) returns to the ball mill for regrinding, and the overflow enters the second hydrocyclone (22); the bottom flow of the second hydrocyclone (22) returns to the ball mill for regrinding, and the overflow port is connected to the feed port of the alkali leaching equipment (3).

6. The system for improving the comprehensive recovery rate of refractory gold ore according to claim 1, characterized in that: The probability of qualified material particle size -0.038mm after passing through the material classification device (2) is 92%.

7. The system for improving the comprehensive recovery rate of refractory gold ore according to claim 1, characterized in that: The slurry concentration in the alkali leaching equipment (3) is 35%, the pH value is 12, and the alkali leaching time is 8 hours.

8. The system for improving the comprehensive recovery rate of refractory gold ore according to claim 1, characterized in that: The slurry concentration in the leaching equipment (5) is 32%, the pH value is 11, and the leaching time is 38 hours.

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