CN115228601A

CN115228601A - Beneficiation method for comprehensively utilizing stripped waste rocks of gold-containing sulfide ores

Info

Publication number: CN115228601A
Application number: CN202210864549.XA
Authority: CN
Inventors: 胡青华; 肖金雄; 梁万仓; 李军; 丰玄
Original assignee: Aolai Eco Technology Shenzhen Co ltd
Current assignee: Aolai Eco Technology Shenzhen Co ltd
Priority date: 2022-07-21
Filing date: 2022-07-21
Publication date: 2022-10-25

Abstract

The invention discloses a beneficiation method for comprehensively utilizing gold-containing sulfide ore stripping waste rock, and relates to the technical field of beneficiation of gold and pyrite stripping waste rock. The beneficiation method comprises the following steps: (1) Stripping waste rocks, and performing first-stage screening to obtain first oversize materials and first undersize materials; (2) Carrying out X-ray photoelectric mineral separation on the oversize material I to obtain a concentrate I; (3) Carrying out primary crushing on the concentrate I, and carrying out secondary screening after crushing to obtain screened material II; (4) Combining the material screening II and the material screening I, and carrying out three-stage screening to obtain material screening III; (5) Screening the material screening III in four sections to obtain material screening IV and material screening IV, and feeding the material screening IV to a first section of spiral chute after adding a sulfide ore flotation reagent to obtain tailings II; (6) The fourth screening material passes through a second-section spiral chute to obtain a third concentrate; (7) And combining the tailings II and the concentrate III, and grinding and floating to obtain gold concentrate. The invention realizes the purposes of full utilization of gold-bearing sulfide ore stripping waste rocks and comprehensive treatment of solid waste.

Description

Beneficiation method for comprehensively utilizing gold-containing sulfide ore stripping waste rocks

Technical Field

The invention relates to the technical field of mineral separation of gold and pyrite stripping barren rocks, in particular to a mineral separation method for comprehensively utilizing gold-containing sulfide ore stripping barren rocks.

Background

Because the gold content of the stripped waste rock of the gold-bearing sulfide ore is lower than 0.5g/t mostly, and the sulfide content is higher, the direct flotation processing and gold recovery cannot form economic benefit, and the content of sulfur of impurities in aggregate of sandstone is higher, so that the waste rock of the type cannot be comprehensively utilized, and meanwhile, the stripped waste rock has the hidden danger of ecological damage. Therefore, it is of great significance to find a beneficiation process which can reduce the content of sulfur in the waste rocks and simultaneously realize the comprehensive utilization of gold in the waste rocks.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the problem of high sulfur content of coarse fraction sandstone impurities in the crushed product is solved; the problem of poor separation effect caused by wide separation particle size of sand and gold-bearing sulfide ore in fine crushed products is solved; the problem of great separation difficulty caused by the granularity of part of fine-grained gold-containing sulfide ores and part of coarse-grained gangue is solved; the method solves the problems of enrichment and recovery of the micro-fine fraction gold-containing sulphide ore.

In order to solve the problems, the invention adopts the technical scheme that:

in a first aspect, the invention provides a beneficiation method for comprehensively utilizing stripped waste rocks of gold-containing sulfide ores, which comprises the following steps:

(1) Stripping waste rocks, and carrying out first-stage screening to obtain first material on a screen and first material on the screen, wherein the size of a screen hole of the first-stage screening is 15-20 mm; the particle size of the stripped waste stone is less than 120mm;

(2) Carrying out X-ray photoelectric mineral separation on the oversize material I to obtain a concentrate I and a tailing I;

(3) Performing first-stage crushing on the concentrate I, performing second-stage screening after crushing to obtain an oversize material II and an oversize material II, and returning the oversize material II to the first-stage crushing; the size of the sieve pore of the two-stage screening is 5 mm-12 mm;

(4) Combining the material screening and material screening with the material screening and material screening to obtain material screening and material screening; the size of the sieve pore of the three-stage sieving is 2.5 mm-5 mm;

(5) The third screening material section is screened in four sections to obtain a fourth screening material section and a fourth screening material section, the fourth screening material section is added with a sulphide ore flotation reagent, and the mixture is uniformly stirred and then sent to a first section of spiral chute to obtain a second concentrate and a second tailing; the size of the sieve pores of the four sections of sieving is 0.25 mm-0.5 mm; the sulfide ore flotation reagent comprises 0-500 g/t of activating agent, 25-200 g/t of collecting agent and 10-50 g/t of foaming agent, wherein the activating agent is copper sulfate, the collecting agent is one or more of xanthate and nigre, and the foaming agent is one or more of No. 2 oil and MIBC (MIBC: 4-methyl-2-pentanol);

(6) The fourth screening material passes through a second-section spiral chute to obtain a third concentrate and a third tailings;

(7) And combining the second tailings and the third concentrate, and grinding and floating to obtain gold concentrate and fourth tailings.

Further, classifying the tailings III in the step (6) through a first-stage cyclone to obtain overflow I and settled sand I; after the settled sand passes through a first-stage centrifuge, obtaining concentrate six and tailings six; and (4) combining the concentrate six with the tailings II and the concentrate III in the step (7).

Further, the sorting concentration of the first-section spiral chute and the second-section spiral chute in the step (5) is 15% -45%; and (4) carrying out magnetic separation on the tailings IV in the step (7) to obtain iron ore concentrate and tailings V, wherein the tailings V can be used as raw materials of the aerated sheet material.

Further, the step (1) also comprises the steps of pre-crushing and pre-screening, wherein the peeled waste rocks are pre-crushed and then pre-screened to obtain pre-screened material and pre-screened material, the pre-screened material returns to the pre-crushing, and the pre-screened material is subjected to first-stage screening; the size of the pre-screened mesh is 20 mm-30 mm.

Further, preparing a sand material I with the granularity of 10-20mm from the tailings obtained in the step (2) through a sand making machine I; discharging the second concentrate in the step (5) to obtain a second sandstone material which is a machine-made sand product; grinding the oversize material III in the step (4), and returning to the third stage for screening after ore discharge; and (4) combining the overflow I and the tailings VI in the step (6), and grinding the mixture to obtain the raw material of the aerated sheet material.

The second aspect provides a beneficiation device for realizing the beneficiation method for comprehensively utilizing the stripped waste rocks of the gold-containing sulfide ores in the first aspect, which comprises a first-stage screening machine, an X-ray photoelectric ore dressing machine, a first-stage crushing machine, a second-stage screening machine, a third-stage screening machine, a fourth-stage screening machine, a flotation reagent stirring barrel, a slurry pump, a first-stage spiral chute, a second-stage spiral chute, a first ball mill and a flotation machine;

the feeding end of the first-section screening machine is used for receiving stripped waste rocks, the discharging end of the first-section screening machine comprises a first screening material discharging end and a first screening material discharging end, the first screening material discharging end is connected with the feeding end of the X-ray photoelectric concentrating machine, the discharging end of the X-ray photoelectric concentrating machine is connected with the feeding end of the first-section crushing machine, the discharging end of the first-section crushing machine is connected with the feeding end of the second-section screening machine, and the discharging end of the second-section screening machine comprises a second screening material discharging end and a second screening material discharging end; the two discharge ends of the material on the screen are connected with the feed end of the first-section crusher, the two discharge ends of the material on the screen are connected with the feed end of the three-section sieving machine, and the one discharge end of the material on the screen is connected with the feed end of the three-section sieving machine;

the discharge end of the three-section screening machine is connected with the feed end of the four-section screening machine, and the discharge end of the four-section screening machine comprises four discharge ends of screen feeding and screen discharging; the four discharge ends of the oversize material are connected with a flotation reagent stirring barrel; the flotation reagent stirring barrel is connected with a slurry pump; the slurry pump is connected with a section of spiral chute; the four discharge ends of the screening and blanking are connected with a two-section spiral chute; the discharge end of the section of spiral chute is connected with the feed end of the first ball mill; the discharge end of the two-section spiral chute is connected with the feed end of the first ball mill; the first ball mill is connected with a flotation machine.

Specifically, the screening mode of the section of screening machine is wet screening and/or dry screening.

Specifically, the screening mode of the two-stage screening machine is wet screening and/or dry screening.

Specifically, the screening mode of the three-section screening machine is wet screening.

Specifically, the screening mode of the four-section screening machine is wet screening.

Preferably, the first section of spiral chute is a spiral chute suitable for coarse fraction ore dressing, and the operation of the first section of spiral chute comprises roughing, fine dressing and medium dressing operations.

Preferably, the two-section spiral chute is a spiral chute suitable for fine-fraction ore dressing, and the operation of the two-section spiral chute comprises rough dressing, fine dressing and medium dressing.

Furthermore, the ore dressing device also comprises a first section of cyclone, a first section of centrifugal machine and a second ball mill; the discharge ends of the two-section spiral chute comprise a concentrate three discharge end and a tailing three discharge end, the concentrate three discharge end is connected with the feed end of the first ball mill, and the tailing three discharge end is connected with the feed end of the first-section cyclone; the discharge end of one section of swirler include an overflow discharge end and a sand setting discharge end, an overflow discharge end connect the second ball mill, a sand setting discharge end connect the feed end of one section of centrifuge, the discharge end of one section of centrifuge include six discharge ends in the concentrate and six discharge ends in the tailings, six connection first ball mill's feed end in the concentrate, six discharge ends in the tailings connect the second ball mill.

Furthermore, the ore dressing device also comprises a magnetic separator; the flotation machine is connected with the magnetic separator; the discharge end of the flotation machine comprises a gold concentrate discharge end and four tailing discharge ends, the four tailing discharge ends are connected with a magnetic separator, and the discharge end of the magnetic separator comprises an iron concentrate discharge end and five tailing discharge ends.

Furthermore, the ore dressing device also comprises a pre-screening machine and a pre-crusher; the feeding end of the first-stage screening machine is connected with the discharging end of the pre-screening machine, and the feeding end of the pre-screening machine is connected with the discharging end of the pre-crushing machine; the discharge end of the pre-screening machine comprises a pre-screening feeding discharge end and a pre-screening discharging discharge end, the pre-screening feeding discharge end is connected with the feed end of the pre-crusher, and the pre-screening discharging discharge end is connected with the feed end of one section of the screening machine.

Specifically, the screening mode of the pre-screening machine is wet screening and/or dry screening.

Furthermore, the ore dressing device also comprises a first sand making machine and a first section of grinding machine; the discharge end of the X-ray photoelectric concentrating machine comprises a first tailing discharge end and a first concentrate discharge end, the first concentrate discharge end is connected with the feed end of a section of crusher, and the first tailing discharge end is connected with a first sand making machine; the discharge end of the first section of spiral chute comprises a second concentrate discharge end and a second tailing discharge end, and the second tailing discharge end is connected with the feed end of the first ball mill; the discharge ends of the three-section screening machine comprise three discharge ends of screening material and three discharge ends of screening material, the three discharge ends of screening material are connected with the feed ends of the four-section screening machine, the three discharge ends of screening material are connected with a section of grinding machine, and the discharge end of the section of grinding machine is connected with the feed end of the three-section screening machine.

Compared with the prior art, the invention has the beneficial effects that:

1. for a broken product, the dissociated gangue minerals are sorted in advance by an X-ray photoelectric method, and tailings obtained by the X-ray photoelectric method can be used as finished building stones after sand making and shaping.

2. By adopting the graded spiral chute gravity separation technology, the separation effect of the gold-bearing sulfide minerals and the gangue can be improved.

3. In the gravity separation process of the spiral chute, a sulfide ore flotation reagent is added to increase the hydrophobic property of gold-containing sulfide ore, gangue enters the outermost layer of the spiral chute in the separation process, the gravity separation and flotation principles are combined to realize the separation of gold-containing sulfide ore and sandstone, and the contradiction problem that the gangue (coarse grain size fraction) and the gold-containing sulfide ore (large specific gravity) cannot be effectively separated is solved.

4. After the sulfide ore flotation agent is added, the yield of gold concentrate of the spiral chute is reduced by 7.8 percent, the content of coarse sand is increased, the recovery rates of gold and sulfur are respectively improved by 20.5 percent and 21.7 percent, and the effect is obvious.

5. The combined process of cyclone pre-enrichment and centrifuge refining is adopted to further recover the gold-containing sulfide ore in the micro-fine fraction in the spiral chute tailings, and the gold recovery rate is increased.

6. Gold-containing sulfide minerals can be enriched and then gold concentrate and iron concentrate can be obtained through ore grinding, flotation and magnetic separation, and flotation tailings can be used for manufacturing raw materials of the aerated plates; the spiral chute tailings can be used for manufacturing aerated plates after ore grinding; finally, the purposes of full utilization of gold-containing sulfide ore stripping waste rocks and comprehensive solid waste treatment are achieved, and the problem of ecological hidden danger caused by mass accumulation of waste rocks is solved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic flow chart of a beneficiation method for comprehensively utilizing stripped waste rocks of gold-containing sulfide ores in the embodiment of the present invention;

fig. 2 is a schematic flow diagram of a beneficiation device of the beneficiation method for comprehensively utilizing the stripped barren rock of the gold-containing sulfide ore according to the embodiment of the present invention.

The labels in the figures illustrate:

1-a pre-crusher; 2-pre-screening machine; 3-a section of screening machine; 4-X-ray photoelectric concentrator; 5-a first-stage crusher; 6-sand making machine I; 7-two-stage sieving machine; 8-three sections of sieving machines; 9-first stage mill; 10-a four-section sieving machine; 11-a flotation agent stirring barrel; 12-a slurry pump; 13-a section of spiral chute; 14-two sections of spiral chutes; 15-a section of cyclone; 16-a first stage centrifuge; 17-a second ball mill; 18-a first ball mill; 19-a flotation machine; 20-magnetic separator.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

The terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In order to more fully understand the technical contents of the present invention, the technical solutions of the present invention will be further described and illustrated with reference to specific embodiments.

Example 1

The beneficiation method for comprehensively utilizing the gold-bearing sulfide ore stripping waste rock shown in the figure 1 comprises the following steps:

(1) Pre-crushing peeled waste rocks with the particle size of less than 120mm, and then pre-screening, wherein the size of a pre-screened sieve pore is 20-30 mm to obtain pre-screened material and pre-screened material, the pre-screened material with the particle size of more than 30mm returns to a pre-crusher to be pre-crushed, the pre-screened material is subjected to first-stage screening, and the size of the first-stage screened sieve pore is 15-20 mm to obtain first-screened material and first-screened material;

(2) Carrying out X-ray photoelectric mineral separation on the oversize material I to obtain a concentrate I and a tailing I; preparing sand material I with the granularity of 10-20mm from the tailings once sand making machine I; the sand-gravel material I can be used as a finished stone product and used for finishing building stones. The first sand stone material adopts the national standard of 'construction sand' GB/T14684-2011, and the sulfur content is lower than 0.5%.

(3) Carrying out first-stage crushing on the first concentrate, carrying out second-stage screening after crushing, wherein the size of a screen hole of the second-stage screening is 5-12 mm, so as to obtain an oversize material II and an oversize material II, and returning the oversize material II to the first-stage crushing;

(4) Combining the material on the screen II and the material on the screen I, and carrying out three-stage screening, wherein the size of a screen hole of the three-stage screening is 2.5-5 mm, so as to obtain a material on the screen III and a material on the screen III; grinding the oversize material III, and returning to the third stage for screening after ore discharge;

(5) Screening the material in the third section by four sections, wherein the size of a sieve pore of the screening in the fourth section is 0.25-0.5 mm to obtain material on the screen and material on the screen, adding a sulfide flotation reagent into the material on the screen, uniformly stirring, and then sending the material to a spiral chute to obtain concentrate II and tailings II; discharging the second concentrate, namely, the second sand and stone material, and preparing machine-made sand; the second tailings are tailings containing gold and sulfur from the spiral distillation; the second sand material adopts the national standard of construction sand GB/T14684-2011, and the sulfur content is lower than 0.5 percent;

the sulfide ore flotation reagent comprises 0-500 g/t of activating agent, 25-200 g/t of collecting agent and 10-50 g/t of foaming agent, wherein the activating agent is copper sulfate, the collecting agent is one or more of xanthate and black pigment, and the foaming agent is one or more of No. 2 oil and MIBC;

specifically, the sulfide ore flotation reagent comprises 300g/t of copper sulfate, 150g/t of butyl xanthate and 30g/t of No. 2 oil.

Preferably, the sorting concentration of the first-section spiral chute and the second-section spiral chute is 15% -45%.

Specifically, the sorting concentration of the first-section spiral chute and the second-section spiral chute is about 30%.

(6) The fourth screening material passes through a second-section spiral chute to obtain a third concentrate and a third tailings; classifying the tailings III through a first-stage cyclone to obtain overflow I and settled sand I; after the settled sand passes through a first-stage centrifuge, obtaining concentrate six and tailings six; combining the overflow I and the tailings, and grinding the mixture by a second ball mill to be used as a raw material of an aerated plate;

(7) Combining the tailings II, the concentrate III and the concentrate VI, and grinding and floating to obtain gold concentrate and tailings IV; and carrying out magnetic separation on the fourth tailings to obtain iron ore concentrate and fifth tailings, wherein the fifth tailings can be used as raw materials of the air-entrapping plates.

The beneficiation device of the beneficiation method for comprehensively utilizing the gold-containing sulfide ore stripping waste rock shown in fig. 2 comprises a first-stage screening machine 3, an X-ray photoelectric concentrator 4, a first-stage crushing machine 5, a second-stage screening machine 7, a third-stage screening machine 8, a fourth-stage screening machine 10, a flotation reagent stirring barrel 11, a slurry pump 12, a first-stage spiral chute 13, a second-stage spiral chute 14, a first ball mill 18 and a flotation machine 19.

The feeding end of the first-stage screening machine 3 is used for receiving stripped waste rocks, the feeding end of the first-stage screening machine 3 is connected with the discharging end of the pre-screening machine 2, and the feeding end of the pre-screening machine 2 is connected with the discharging end of the pre-crushing machine 1; the discharge end of the pre-screening machine 2 comprises a pre-screening feeding discharge end and a pre-screening discharging discharge end, the pre-screening feeding discharge end is connected with the feed end of the pre-crusher 1, and the pre-screening discharging discharge end is connected with the feed end of one section of the screening machine 3. The discharge end of the first screening machine 3 comprises an oversize material discharge end and an undersize material discharge end, and the oversize material discharge end is connected with the feed end of the X-ray photoelectric concentrating machine 4.

The discharge end of the X-ray photoelectric concentrating machine 4 comprises a first tailing discharge end and a first concentrate discharge end, the first tailing discharge end is connected with a first sand making machine 6, and the first concentrate discharge end is connected with the feed end of a section of crusher 5. The discharge end of the first-stage crusher 5 is connected with the feed end of the second-stage sieving machine 7, and the discharge end of the second-stage sieving machine 7 comprises a second material discharge end for material feeding on the sieve and a second material discharge end for material discharging on the sieve; the two discharge ends of the material on the screen are connected with the feed end of the first section of the crusher 5, the two discharge ends of the material on the screen are connected with the feed end of the three-section sieving machine 8, and the one discharge end of the material on the screen is connected with the feed end of the three-section sieving machine 8.

The discharge ends of the three sections of screening machines 8 comprise three discharge ends of screening materials and three discharge ends of screening materials, the three discharge ends of the screening materials are connected with the first section of grinding machine 9, the discharge end of the first section of grinding machine 9 is connected with the feed end of the three sections of screening machines 8, and the three discharge ends of the screening materials are connected with the feed end of the four sections of screening machines 10. The discharge ends of the four-section screening machine 10 comprise four discharge ends of screen feeding and four discharge ends of screen discharging. The four discharge ends of oversize material are connected with a flotation reagent stirring barrel 11, the flotation reagent stirring barrel 11 is connected with a slurry pump 12, and the slurry pump 12 is connected with a section of spiral chute 13. The discharge end of the first section of spiral chute 13 comprises a second concentrate discharge end and a second tailing discharge end, the second tailing discharge end is connected with the feed end of the first ball mill 18, and the discharge of the second concentrate is a machine-made sand product. The four discharge ends of the screen material are connected with a second-section spiral chute 14, the discharge ends of the second-section spiral chute 14 comprise a third concentrate discharge end and a third tailing discharge end, the third concentrate discharge end is connected with the feed end of the first ball mill 18, and the third tailing discharge end is connected with the feed end of a first cyclone 15; the discharge end of the first cyclone 15 comprises an overflow discharge end and a grit discharge end, the overflow discharge end is connected with the feed end of the second ball mill 17, and the grit discharge end is connected with the feed end of the first centrifuge 16. The discharge end of the first-stage centrifuge 16 comprises a concentrate six discharge end and a tailing six discharge end; the six discharge ends of the tailings are connected with the feed end of the second ball mill 17, and the six concentrate ends are connected with the feed end of the first ball mill 18. The first ball mill 18 is connected with a flotation machine 19, and the flotation machine 19 is connected with a magnetic separator 20. The discharge end of the flotation machine 19 comprises a gold concentrate discharge end and a four tailing discharge end, and the four tailing discharge ends are connected with a magnetic separator 20. The discharge end of the magnetic separator 20 comprises an iron ore concentrate discharge end and a tailing five discharge end.

Specifically, the pre-crusher 1 is a PWA100120 crusher, the pre-screening machine 2 is a YKR3073 heavy circular vibrating screen, the first screening machine 3 is a YKR3060 circular vibrating screen, the X-ray photoelectric separator 4 is an XRT-1400 type, the first screening machine 5 is a CC400 (S) conical crushing machine, the first sand making machine 6 is a VS1500R vertical shaft impact type crusher, the second screening machine 7 is a YKR3060 linear screen, the third screening machine 8 and the fourth screening machine 10 are YKR3673 wet circular vibrating screens, the first grinding machine 9 is a phi 3.8X 5.0m rod grinding machine, and the flotation agent stirring barrel 11 is a phi 3.8X 5.0m rod grinding machinePhi 2.0 x 2.0m specification, the slurry pump 12 is of the specification of Q =326.7m3/H H =15m, the specifications of the first-stage spiral chute 13 and the second-stage spiral chute 14 are both of phi 1200-4 models, the first-stage cyclone 15 is of a phi 250 x 4 group, the first-stage centrifugal machine 16 is of QS40 specification, the second ball mill 17 is of a phi 2.7 x 4.5m ball mill, the first ball mill 18 is of a phi 2.7 x 4.5m ball mill, and the flotation machine 19 is of 6m ³ An inflatable flotation machine, wherein the magnetic separator 20 is a CTN wet magnetic separator.

Comparative example 1

Comparative example 1 differs from example 1 in that comparative example 1 has no sulphide ore flotation agent added and the remaining conditions are the same.

Comparative example 2

Comparative example 2 differs from example 1 in that the discharge end of the four-stage sieving machine in comparative example 2 is connected to the feed end of a first ball mill, the first ball mill is connected to a flotation machine, and the flotation machine is connected to a magnetic separator. The product obtained by four-stage screening is directly subjected to ore grinding and flotation and then subjected to magnetic separation to obtain a final product, and the rest conditions are the same.

Comparative example 3

Comparative example 3 differs from example 1 in that comparative example 3 only fed tailings two and concentrate three, and concentrate six did not feed the primary mill, all other conditions being the same.

Comparative example 4

Comparative example 4 is different from example 1 in that the sulfide ore flotation agent in comparative example 4 comprises 600g/t of copper sulfate, 150g/t of butyl xanthate and 30g/t of No. 2 oil, and the rest conditions are the same.

Comparative example 5

Comparative example 5 is different from example 1 in that the sulfide ore flotation agent in comparative example 5 comprises 300g/t of copper sulfate, 250g/t of butyl xanthate and 30g/t of No. 2 oil, and the rest conditions are the same.

Comparative example 6

Comparative example 6 is different from example 1 in that the sulfide ore flotation agent in comparative example 6 comprises 300g/t of copper sulfate, 150g/t of butyl xanthate and 60g/t of No. 2 oil, and the rest conditions are the same.

Comparative example 7

Comparative example 7 is different from example 1 in that the sorting concentration of the first-stage spiral chute and the second-stage spiral chute in comparative example 7 is 10%, and the other conditions are the same.

Comparative example 8

Comparative example 8 differs from example 1 in that the sorting concentration of the first-stage spiral chute and the second-stage spiral chute in comparative example 8 is 50%, and the other conditions are the same.

The ore dressing recovery rate calculation method comprises the following steps:

beneficiation recovery rate (gold and sulfur equivalences) = (actual concentrate weight x concentrate grade)/(raw ore weight x raw ore grade) x 100%; wherein, concentrate refers to the product containing sulfur and gold, and raw ore refers to the raw material fed into the process. Grade refers to the content, gold in units of mass (g/t) and sulfur in units of mass percent (%).

The gold recovery, sulfur recovery, concentrate secondary yield, tailings secondary yield, sand disulfide content of example 1 and comparative examples 1-8 were tested and the results were as follows:

table 1 results of testing gold recovery, sulfur recovery, secondary yield of concentrate, secondary yield of tailings, and disulfide content of sand for the beneficiation methods of example 1 and comparative examples 1 to 8

From the test results in table 1, it is known that the technical effects of containing sandstone materials in the present embodiment in a prescribed range and having high gold and sulfur recovery rates cannot be simultaneously achieved by adding no sulfide flotation agent (comparative example 1), sorting by using no spiral chute (comparative example 2), mixing no concentrate six with tailings two and concentrates three times and then grinding and floating (comparative example 3), controlling the content of the activator in the sulfide flotation agent not to be in the range of the present application (comparative example 4), controlling the content of the collector in the sulfide flotation agent not to be in the range of the present application (comparative example 5), controlling the content of the foaming agent in the sulfide flotation agent not to be in the range of the present application (comparative example 6), and controlling the sorting concentrations of the first-stage spiral chute and the second-stage spiral chute not to be in the range of the present application (comparative example 7 and comparative example 8). Therefore, the invention achieves the aim of selective crushing by using X-ray photoelectricity on the crushed coarse-grained products in advance, performs grading reselection on the crushed fine-grained products, adds a flotation reagent to strengthen the sorting effect of the spiral chute, finally achieves the aims of full utilization of gold-containing sulfide ore stripping waste rocks and comprehensive solid waste treatment, and solves the problem of ecological hidden danger caused by mass accumulation of the waste rocks.

In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A beneficiation method for comprehensively utilizing stripped waste rocks of gold-containing sulfide ores is characterized by comprising the following steps:

(3) Performing first-stage crushing on the concentrate I, performing second-stage screening after crushing to obtain an oversize material II and an oversize material II, and returning the oversize material II to the first-stage crushing; the size of the sieve pore of the second-stage screening is 5 mm-12 mm;

(4) Combining the second screening material and the first screening material, and carrying out three-stage screening to obtain a third screening material and a third screening material; the size of the sieve pore of the three-stage sieving is 2.5 mm-5 mm;

(5) Screening the material screening III in four sections to obtain material screening IV and material screening IV, adding a sulfide ore flotation reagent into the material screening IV, uniformly stirring, and sending to a first section of spiral chute to obtain concentrate II and tailings II; the size of the sieve pores of the four sections of sieving is 0.25 mm-0.5 mm; the sulfide ore flotation reagent comprises 0-500 g/t of activating agent, 25-200 g/t of collecting agent and 10-50 g/t of foaming agent, wherein the activating agent is copper sulfate, the collecting agent is one or more of xanthate and black powder, and the foaming agent is one or more of No. 2 oil and MIBC;

2. The beneficiation method for comprehensively utilizing the stripped waste rocks of the gold-bearing sulfide ores according to claim 1, wherein the tailings III in the step (6) are classified by a first-stage cyclone to obtain overflow I and settled sand I; after the settled sand passes through a first-stage centrifuge, obtaining concentrate six and tailings six; and (4) combining the concentrate six with the tailings II and the concentrate III in the step (7).

3. The beneficiation method for comprehensively utilizing the gold-bearing sulfide ore stripping waste rock according to claim 2, wherein the concentration of the separation of the first-stage spiral chute and the second-stage spiral chute in the step (5) is 15% -45%; and (4) carrying out magnetic separation on the tailings IV in the step (7) to obtain iron ore concentrate and tailings V, wherein the tailings V can be used as raw materials of the aerated sheet material.

4. The beneficiation method for comprehensive utilization of stripped waste rocks of gold-bearing sulfide ores according to claim 3, wherein the step (1) further comprises the steps of pre-crushing and pre-screening, the stripped waste rocks are pre-crushed and then pre-screened to obtain pre-screened material and pre-screened material, the pre-screened material is returned to be pre-crushed, and the pre-screened material is subjected to one-stage screening; the size of the pre-screened sieve pore is 20 mm-30 mm.

5. The beneficiation method for comprehensively utilizing the stripped waste rocks of gold-containing sulfide ores according to claim 4, wherein the tailings in the step (2) are subjected to sand making to obtain a sand stone I with the granularity of 10-20 mm; discharging the second concentrate in the step (5) to obtain a second sandstone material which is a machine-made sand product; grinding the oversize material III in the step (4), and returning to the third section for screening after ore discharge; and (5) combining the overflow I and the tailings VI in the step (6), and grinding the ores to obtain the raw material of the aerated sheet.

6. The beneficiation device for realizing the beneficiation method for comprehensively utilizing the stripped waste rocks of the gold-containing sulfide ores according to any one of claims 1 to 5 is characterized by comprising a first-stage screening machine, an X-ray photoelectric concentrating machine, a first-stage crushing machine, a second-stage screening machine, a third-stage screening machine, a fourth-stage screening machine, a flotation reagent stirring barrel, a slurry pump, a first-stage spiral chute, a second-stage spiral chute, a first ball mill and a flotation machine;

the discharge ends of the three-section screening machine are connected with the feed ends of the four-section screening machine, and the discharge ends of the four-section screening machine comprise four oversize material discharge ends and four undersize material discharge ends; the four discharge ends of the oversize material are connected with a flotation reagent stirring barrel; the flotation reagent stirring barrel is connected with a slurry pump; the slurry pump is connected with a section of spiral chute; the four discharge ends of the screening and blanking are connected with a two-section spiral chute; the discharge end of the first section of spiral chute is connected with the feed end of the first ball mill; the discharge end of the two-section spiral chute is connected with the feed end of the first ball mill; the first ball mill is connected with a flotation machine.

7. The beneficiation plant according to claim 6, further comprising a primary cyclone, a primary centrifuge, a second ball mill; the discharge ends of the two-section spiral chute comprise a third concentrate discharge end and a third tailing discharge end, the third concentrate discharge end is connected with the feed end of the first ball mill, and the third tailing discharge end is connected with the feed end of the first cyclone; the discharge end of the first cyclone comprises an overflow discharge end and a settled sand discharge end, the overflow discharge end is connected with the second ball mill, the settled sand discharge end is connected with the feed end of the first centrifuge, the discharge end of the first centrifuge comprises a concentrate six discharge end and a tailing six discharge end, the concentrate six discharge end is connected with the feed end of the first ball mill, and the tailing six discharge end is connected with the second ball mill.

8. The beneficiation plant according to claim 7, further comprising a magnetic separator; the flotation machine is connected with the magnetic separator; the discharge end of the flotation machine comprises a gold concentrate discharge end and four tailing discharge ends, the four tailing discharge ends are connected with a magnetic separator, and the discharge end of the magnetic separator comprises an iron concentrate discharge end and five tailing discharge ends.

9. The beneficiation plant according to claim 8, further comprising a pre-screening machine and a pre-crusher; the feeding end of the first section of screening machine is connected with the discharging end of the pre-screening machine, and the feeding end of the pre-screening machine is connected with the discharging end of the pre-crusher; the discharge end of the pre-screening machine comprises a pre-screening material feeding discharge end and a pre-screening material discharging discharge end, the pre-screening material feeding discharge end is connected with the feed end of the pre-crusher, and the pre-screening material discharging end is connected with the feed end of the screening machine.

10. The beneficiation device according to claim 9, further comprising a first sand making machine, a first section mill; the discharge end of the X-ray photoelectric concentrating machine comprises a first tailing discharge end and a first concentrate discharge end, the first concentrate discharge end is connected with the feed end of a section of crushing machine, and the first tailing discharge end is connected with a first sand making machine; the discharge end of the first section of spiral chute comprises a second concentrate discharge end and a second tailing discharge end, and the second tailing discharge end is connected with the feed end of the first ball mill; the discharge ends of the three-section screening machine comprise three discharge ends of screening material and three discharge ends of screening material, the three discharge ends of screening material are connected with the feed ends of the four-section screening machine, the three discharge ends of screening material are connected with a section of grinding machine, and the discharge end of the section of grinding machine is connected with the feed end of the three-section screening machine.