CN113333151B - Beneficiation method for gold ore - Google Patents

Abstract

The invention relates to a beneficiation method of gold ores, which comprises the following steps: grading gold-containing minerals to obtain coarse ores and fine ores, and sequentially carrying out chute roughing and table concentration on the coarse ores to obtain concentrate A; carrying out flotation on the fine ore to obtain a concentrate B, and mixing the concentrate A and the concentrate B to obtain a gold concentrate; the collecting agent in the flotation comprises, by mass, 25-35 parts of mercaptobenzothiazole, 5-10 parts of ammonium dibutyldithiophosphate, 3-5 parts of soluble alkali, 0.3-1 part of fatty alcohol-polyoxyethylene ether and 55-60 parts of a solvent. The mineral is subjected to a gravity-flotation combined process flow, a gravity separation method is used for recovering coarse-grained gold, a flotation method is used for recovering fine-grained gold and fine-grained gold, the mineral separation and recovery problems of the coarse-grained gold and the fine-grained gold are effectively solved, the gold mineral is efficiently recovered, and a high gold recovery rate is obtained.

Description

Beneficiation method for gold ore

Technical Field

The invention relates to the field of beneficiation, in particular to a beneficiation method for gold ores.

Background

At present, because of unique physical and chemical properties, gold is widely applied to the fields of electronics, modern communication, aerospace, new energy, new materials, jewelry industry and the like; also, due to its natural financial nature, gold is a special currency for reserves and investments in countries around the world. The extraction process of gold includes cyanidation, gravity separation, floatation, etc.

For example, CN108823406A discloses a method for extracting gold by infiltrating low-grade gold ore, which comprises the following steps: a. pretreatment of gold ore: removing impurities such as clay, silt and the like on the surface of the obtained gold ore, crushing and screening, selecting a ratio of adding slaked lime with the granularity of less than 70mm, mixing, uniformly stirring to obtain a mixture, and piling the mixture to form a rock pile; b. preparing a wetting agent: adjusting the pH value of a solvent to form an alkaline solution with the pH value of 10-12, and adding sodium cyanide to obtain a sizing agent; c. spraying: continuously spraying the ore heap with the impregnating compound to obtain pregnant solution; d. obtaining gold-loaded carbon: pumping the pregnant solution into an adsorption column filled with activated carbon, absorbing a gold-containing complex in the pregnant solution by the activated carbon to obtain gold-loaded carbon and a barren solution with low gold content, and repeating the steps b, c and d after the barren solution is recovered and treated; e. obtaining simple substance gold: and d, processing the gold-loaded carbon generated in the step d to obtain simple substance gold.

CN102690957A discloses a process for extracting gold from copper-containing gold oxide ore, which belongs to the hydrometallurgy technology, the process comprises the steps of crushing, grinding and grading the copper-containing gold oxide ore, then carrying out alkali treatment on the ore, then adding a chelating agent and sodium cyanide in a certain proportion to realize the inhibition of the leaching of copper and the selective leaching of gold, and finally extracting the gold from the leaching solution by using conventional activated carbon for adsorption. The method has the advantages of simple process, simple equipment, easy implementation, high gold leaching rate, low medicament consumption, low capital investment and low cost, and is a gold extraction method which is easy to realize industrial production and has good economic benefit.

Although the cyanidation method is the most widely applied gold extraction method with relatively mature technology at present, and has the advantages of high recovery rate, low cost, good stability and the like, the material needs to be finely ground and leached by using highly toxic sodium cyanide, so that potential safety hazards of production management exist, and the cyanide remaining in tailings seriously pollutes the environment; the gravity separation method is a traditional gold dressing and metallurgy technology, has good recovery effect on coarse-grained gold, but fine-grained gold is easy to lose in tailings, and the gold recovery rate is low; the flotation method is an efficient mineral recovery technology, and depends on the recovery of floating solid gold on the surface of the gold adsorbed by a beneficiation reagent, but because the density of coarse gold is high, the coarse gold is difficult to adsorb on foam to float to achieve the recovery purpose, so that the coarse gold is easy to lose in tailings.

Therefore, a gold ore dressing method with high efficiency, small environmental impact and strong adaptability is urgently needed to be developed.

Disclosure of Invention

In view of the problems in the prior art, the invention aims to provide a gold ore dressing method, which overcomes the defects that the traditional single gravity separation process cannot recover fine and micro-fine gold, so that the gold recovery rate is low, and also overcomes the defects that the single flotation process cannot recover coarse gold, so that the gold recovery rate is low. The process adaptability is very strong, the influence of mineral properties is small, and when the gold content of the mineral coarse grains is high, the mineral coarse grains can be recovered in a coarse grain reselection link; when the content of fine and micro-fine gold in the mineral is high, the gold can be recovered by adopting a specific fine flotation link, so that the recovery of coarse particles, fine particles and micro-fine gold is ensured, and the recovery rate of gold is improved.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention provides a beneficiation method of gold ores, which comprises the following steps:

(1) grading gold-containing minerals to obtain coarse-grained ores and fine-grained ores, and sequentially carrying out chute roughing and table concentration on the coarse-grained ores to obtain concentrate A;

(2) performing flotation on the fine ore to obtain a concentrate B, and mixing the concentrate A and the concentrate B to obtain a gold concentrate;

the flotation comprises roughing, concentrating and scavenging; the collecting agent in the flotation comprises, by mass, 25-35 parts of mercaptobenzothiazole, 5-10 parts of ammonium dibutyldithiophosphate, 3-5 parts of soluble alkali, 0.3-1 part of fatty alcohol-polyoxyethylene ether and 55-60 parts of a solvent.

According to the beneficiation method provided by the invention, the mineral is subjected to a gravity-flotation combined process flow of recycling the coarse and fine grading operation after ore grinding, coarse grain gravity separation, fine grain flotation and middling regrinding, coarse grain gold is recovered by using a gravity separation method, fine grain gold and fine grain gold are recovered by using a flotation method, coarse grain gold, fine grain gold and fine grain gold in the gold ore are effectively recovered, the beneficiation recovery problem of the coarse grain gold, the fine grain gold and the fine grain gold is effectively solved, the gold mineral is efficiently recovered, and a higher gold recovery rate is obtained.

The gold-bearing mineral in the invention can be raw ore after being crushed and ground or other gold-bearing minerals conforming to the process flow.

In the present invention, the mercaptobenzothiazole in the collector in flotation is 25 to 35 parts by weight, for example, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts, 30 parts, 31 parts, 32 parts, 33 parts, 34 parts, 35 parts, etc., but not limited to the recited values, and other values not recited in the range are also applicable.

In the present invention, the ammonium dibutyldithiophosphate in the collector in flotation is 5 to 10 parts by weight, for example, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts or 10 parts by weight, but is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.

In the present invention, the soluble alkali in the collector in flotation is 3 to 5 parts by weight, for example, 3 parts, 4 parts, or 5 parts, but is not limited to the values listed, and other values not listed in the range are also applicable. The soluble base may be sodium hydroxide or potassium hydroxide, etc.

In the present invention, the fatty alcohol-polyoxyethylene ether in the collector in the flotation is 0.3 to 1 part by weight, for example, 0.3 part, 0.4 part, 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part or 1 part, but not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.

In the present invention, the amount of the solvent in the collector in the flotation is 55 to 60 parts by weight, for example, 55 parts, 56 parts, 57 parts, 58 parts, 59 parts, or 60 parts, but is not limited to the above-mentioned values, and other values not shown in the above range are also applicable.

The solvent for the collector in the present invention may be a medium for dissolving the above components, such as water or other solvents that can perform the same function without affecting the collector performance.

As a preferable embodiment of the present invention, the coarse-grained ore of the step (1) has a particle size of more than 74. mu.m, for example, 80. mu.m, 90. mu.m, 100. mu.m, 110. mu.m, or 120. mu.m, etc., but is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.

Preferably, the fine-grained ore has a particle size of 74 μm or less, and may be, for example, 74 μm, 72 μm, 70 μm, 68 μm, 66 μm, 64 μm, 62 μm or 60 μm, but is not limited to the values listed, and other values not listed in this range are equally applicable.

Preferably, the fatty alcohol-polyoxyethylene ether has a carbon chain of C7-C9 and a degree of polymerization of 6-8, such as C7, C8 or C9, such as 6, 7 or 8, but not limited to the recited values, and other values not recited in this range are also applicable.

As a preferable technical scheme of the invention, the raw material selected by the table concentrator in the step (1) is the concentrate roughly selected by the chute.

Preferably, middlings from the chute rougher in step (1) are reground and returned to the classification.

Preferably, the regrinding ends at 80-95% of the total mass of the material, for example 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94% or 95% of the total mass of the material, with a particle size of 74 μm or less, but not limited to the values listed, and other values not listed in this range apply equally.

As a preferred embodiment of the present invention, the transverse gradient of the rocking platforms in the refining step (1) is less than or equal to 10 °, for example 10 °, 9 °, 8 °, 7 °, 6 °, 5 °, 4 °, 3 ° or 1 °, but not limited to the values listed, and other values not listed in this range are also applicable.

In a preferred embodiment of the present invention, the rough concentration in step (2) is performed at least 1 time, and may be performed, for example, 1 time, 2 times, 3 times, 4 times, or 5 times, but is not limited to the values listed, and other values not listed in the range are also applicable.

Preferably, said concentration in step (2) is carried out at least 3 times, for example, 3 times, 4 times, 5 times, 6 times, 7 times, etc., but not limited to the recited values, and other values not recited in the range are also applicable.

Preferably, the sweeping in step (2) is performed at least 3 times, for example, 3, 4, 5, 6 or 7 times, but not limited to the recited values, and other values not recited in the range are also applicable.

As a preferable technical scheme of the invention, the reagent used in the flotation in the step (2) also comprises a foaming agent and an activating agent.

Preferably, the activator comprises copper sulfate.

Preferably, the foaming agent comprises pine oil.

As a preferred technical scheme of the invention, the roughing comprises adding a flotation agent into the ore pulp for flotation;

preferably, the amount of the activator added in the coarse selection is 200-400g/t, such as 200g/t, 210g/t, 220g/t, 230g/t, 240g/t, 250g/t, 260g/t, 270g/t, 280g/t, 290g/t, 300g/t, 310g/t, 320g/t, 330g/t, 340g/t, 350g/t, 360g/t, 370g/t, 380g/t, 390g/t or 400g/t, etc., but is not limited to the values listed, and other values not listed in the range are equally applicable.

Preferably, the amount of blowing agent added in the course selection is 20 to 50g/t, for example, 20g/t, 25g/t, 30g/t, 35g/t, 40g/t, 45g/t or 50g/t, etc., but is not limited to the recited values, and other values not recited in this range are also applicable.

Preferably, the addition amount of the collecting agent in the coarse separation is 100-400g/t, such as 100g/t, 150g/t, 200g/t, 250g/t, 300g/t, 350g/t or 400g/t, and the like, but is not limited to the values listed, and other values not listed in the range are also applicable.

As a preferred technical scheme of the invention, the roughed concentrate is subjected to concentration.

Preferably, the concentration is a blank concentration.

As a preferred technical scheme of the present invention, the scavenging is to perform flotation on the roughed tailings.

Preferably, the amount of the activating agent added in the sweep is 100-200g/t, such as 100g/t, 110g/t, 120g/t, 130g/t, 140g/t, 150g/t, 160g/t, 170g/t, 180g/t, 190g/t or 200g/t, etc., but not limited to the recited values, and other values not recited in the range are also applicable.

Preferably, the amount of blowing agent added in the sweep is from 10 to 20g/t, for example, 10g/t, 11g/t, 12g/t, 13g/t, 14g/t, 15g/t, 16g/t, 17g/t, 18g/t, 19g/t or 20g/t, and the like, but is not limited to the recited values, and other values not recited in this range are equally applicable.

Preferably, the amount of collector added in the sweep is 50-100g/t, for example 50g/t, 60g/t, 70g/t, 80g/t, 90g/t or 100g/t, etc., but is not limited to the recited values, and other values not recited in this range are equally applicable.

As a preferable technical scheme of the invention, the beneficiation method comprises the following steps:

(1) grading gold-containing minerals to obtain coarse-grained ores and fine-grained ores, and sequentially carrying out chute roughing and table concentration on the coarse-grained ores to obtain concentrate A; the granularity of the coarse-grained ore is more than 74 mu m; the particle size of the fine ore is less than or equal to 74 mu m; the raw material selected by the table concentrator is the concentrate of the rough concentration of the chute; regrinding middlings obtained by the rough concentration of the chute and returning the middlings to the classification; the regrinding end point is that the granularity of particles in the material is less than or equal to 74 mu m and accounts for 80-95% of the total mass of the material; the transverse gradient of the shaking table in the fine selection of the shaking table is less than or equal to 10 degrees;

(2) performing flotation on the fine ore to obtain a concentrate B, and mixing the concentrate A and the concentrate B to obtain a gold concentrate;

the flotation comprises roughing, concentrating and scavenging; the collecting agent in the flotation comprises, by mass, 25-35 parts of mercaptobenzothiazole, 5-10 parts of ammonium dibutyldithiophosphate, 3-5 parts of soluble alkali, 0.3-1 part of fatty alcohol-polyoxyethylene ether and 55-60 parts of a solvent; the carbon chain of the fatty alcohol-polyoxyethylene ether is C7-C9, and the polymerization degree is 6-8; the roughing is carried out for at least 1 time; the concentration is carried out at least 3 times; the scavenging is carried out at least 3 times; the agents used in the flotation also comprise a foaming agent and an activating agent; the activator comprises copper sulfate; the foaming agent comprises pinitol oil; the roughing comprises adding a flotation agent into the ore pulp for flotation; the addition amount of the activating agent in the rough selection is 200-400 g/t; the addition amount of the foaming agent in the coarse selection is 20-50 g/t; the addition amount of the collecting agent in the rough selection is 100-400 g/t; the roughly selected concentrate is subjected to fine selection; the selection is blank selection; the scavenging is to perform flotation on the roughed tailings; the addition amount of the activating agent in the scavenging is 100-200 g/t; the addition amount of the foaming agent in the scavenging is 10-20 g/t; the addition amount of the collecting agent in the sweeping process is 50-100 g/t.

In the invention, because of adopting the combined heavy-floating process, the fineness of the coarse ore can be properly reduced, the sedimentation, dam piling or underground filling of tailings are facilitated, the ore amount entering the flotation is reduced, the dosage and the cost of the flotation reagent are reduced, and the used reagent does not contain cyanide and has little influence on the environment.

In the invention, the preparation method adopts the following processes:

(1) adding mercaptobenzothiazole into alkali liquor according to a formula for first treatment to obtain a solution A; the first treatment comprises first stirring and first heat preservation which are sequentially carried out; the first stirring time is 2-2.5 h; the time and temperature of the first heat preservation is 20-30 ℃; the first heat preservation time is 1-2 h;

(2) adding fatty alcohol-polyoxyethylene ether into the solution A for second treatment to obtain a solution B; the temperature of the second treatment is 20-30 ℃; the time of the second treatment is 0.5-1 h;

(3) adding ammonium dibutyldithiophosphate into the solution B for mixing to obtain the collecting agent; the mixing time is 1-2 h.

Compared with the prior art, the invention at least has the following beneficial effects:

(1) according to the gold ore dressing method, the ore is subjected to the combined process of grinding, coarse and fine grading, coarse grain reselection, fine grain flotation, middling regrinding and returning to coarse and fine grading operation for recycling, coarse grain gold is recovered by using the reselection method, fine and fine grain gold is recovered by using a specific collecting agent in flotation, coarse grain gold, fine grain gold and fine grain gold in the gold ore are effectively recovered, the difficulty in dressing and recovering coarse grain gold, fine grain gold and fine grain gold is effectively solved, gold minerals are efficiently recovered, and a high gold recovery rate is obtained.

(2) The gravity-flotation combined process flow adopted by the invention has strong adaptability and is less influenced by mineral properties, and when the gold content of the mineral coarse grains is high, the mineral coarse grains can be recovered in a coarse grain reselection link; when the content of the mineral fine and micro-fine gold is high, the mineral fine and micro-fine gold can be recovered in a fine flotation link, so that the high-efficiency recovery of coarse, fine and micro-fine gold is ensured, and the recovery rate of gold is improved.

(3) The combined heavy-floating process flow adopted by the invention can properly discharge and grind the fineness of the ore, is beneficial to sedimentation, dam piling or underground filling of tailings, reduces the amount of ore entering flotation, reduces the dosage and the cost of the flotation reagent, and the used reagent does not contain cyanide and has little influence on the environment.

Detailed Description

To better illustrate the invention and to facilitate the understanding of the technical solutions thereof, typical but non-limiting examples of the invention are as follows:

example 1

The gold grade in certain gold ore in Xinjiang is 2.52g/t, the gold ore mainly comprises silver gold ore, a small amount of natural gold and a very small amount of gold and silver ore; the argentum-gold ore is the most main gold mineral in the ore, most of which is distributed in pyrite and arsenopyrite in the form of sub-micro-gold, and a small amount of micro-gold exists in the form of argentum-gold ore; the natural gold is mainly in the form of micro particles or sub-micro particles, embedded in the edges, cracks or holes of the pyrite particles, and then wrapped in the pyrite.

The gold ore beneficiation method is a gravity-flotation combined process flow for returning to the coarse and fine classification operation after ore grinding, coarse and fine classification, coarse grain gravity separation, fine grain flotation and middling regrinding are carried out on minerals, and comprises the following beneficiation steps:

(a) grinding the minerals by a ball mill until the content of-0.074 mm is 55%, and then feeding the ground minerals into a high-frequency vibrating screen to obtain a coarse fraction material with the particle size of +0.074mm and a fine fraction material with the particle size of-0.074 mm;

(b) performing rough concentration and table concentration on the plus 0.074mm coarse fraction material obtained in the step (a) by adopting a spiral chute to obtain coarse gold concentrate 1, merging middlings and table tailings in the spiral chute into a ball mill, grinding the middlings and table tailings until the content of minus 0.074mm is 85%, returning the middlings and table tailings to a high-frequency vibrating screen, merging and grading the materials after grinding the minerals, and discharging the spiral chute tailings 1 to a tailings pond;

(c) and (b) performing flotation on the fine-grained material with the grain size of-0.074 mm obtained in the step (a) by using a flotation machine to produce fine-grained gold concentrate 2 and tailings 2, wherein the fine-grained gold concentrate 2 and the coarse-grained gold concentrate 1 obtained in the step (b) are combined to be used as gold concentrate, and the fine-grained flotation tailings 2 and the coarse-grained spiral chute tailings 1 obtained in the step (b) are combined to be tailings and discharged to a tailing pond.

And (c) floating fine-grained materials of 0.074mm by using a flotation machine, which specifically comprises the following steps:

the primary roughing comprises the following steps: adding an activating agent, a collecting agent and a foaming agent into the ore pulp to perform flotation on the gold minerals to obtain primary rougher concentrate and primary rougher tailings; the primary rougher tailings are used as feeding ores for primary scavenging, and the primary rougher concentrate is used as feeding ores for fine concentration; the collector comprises 32 parts by mass of mercaptobenzothiazole, 10 parts by mass of ammonium dibutyldithiophosphate, 4 parts by mass of soluble alkali (sodium hydroxide), 0.4 part by mass of fatty alcohol-polyoxyethylene ether and 57 parts by mass of solvent water; the carbon chain of the fatty alcohol-polyoxyethylene ether is C7, and the polymerization degree is 6; the foaming agent is terpineol oil; according to the feeding amount, the addition amount of the activating agent is 300g/t, the addition amount of the collecting agent is 250g/t, and the addition amount of the foaming agent is 30 g/t; the primary scavenging comprises: adding an activating agent, a collecting agent and a foaming agent into the primary rougher tailings to perform flotation on gold minerals to obtain primary scavenging concentrate and primary scavenging tailings; wherein the primary scavenging tailings are used as feeding ores for secondary scavenging, and the primary scavenging concentrate is used as middling and returns to the primary roughing operation; wherein the addition amount of the activating agent is 100g/t according to the ore feeding amount; the addition amount of the collecting agent is 70 g/t; the addition amount of the foaming agent is 15 g/t; the secondary scavenging comprises: adding an activating agent, a collecting agent and a foaming agent into the primary scavenging tailings to perform flotation on the gold minerals to obtain secondary scavenging concentrates and secondary scavenging tailings; wherein, the tailings of the secondary scavenging are used as the third scavenging feed, and the secondary scavenging concentrate is used as the middling to return to the primary scavenging operation; preferably, the addition amount of the collecting agent is 30g/t and the addition amount of the foaming agent is 6g/t according to the ore feeding amount; the fine selection comprises the following steps: performing blank concentration by taking the primary roughing concentrate as the feeding ore of the primary concentration to obtain primary concentration concentrate and primary concentration tailings; returning the primary concentrated tailings to primary roughing operation, and taking the primary concentrated concentrate as feed ore for secondary concentration to carry out blank concentration to obtain secondary concentrated concentrate and secondary concentrated tailings; returning the secondary concentrated tailings to the primary concentration operation, and performing blank concentration on the secondary concentrated concentrate serving as the feed for the tertiary concentration to obtain tertiary concentrated concentrate and tertiary concentrated tailings; and the third concentration concentrate is used as gold concentrate 2, and the third concentration tailings return to the second concentration operation.

Through detection, closed circuit test indexes obtained in a laboratory are as follows: the gold grade in the ore is 2.52g/t, and after the gold is separated by the method, the gold grade in the gold concentrate is 45.22g/t, and the gold recovery rate is 92.65%.

Example 2

The gold grade in a certain gold ore in Hainan is 3.80g/t, the gold ore mainly is natural gold, a small amount of silver gold ore and tellurium gold and silver ore, and a very small amount of gold and silver ore; the natural gold is the most main gold mineral in the ore, is mostly produced in the form of granules and sheets with different sizes, a small amount of the natural gold is in the form of round granules, and part of the natural gold exists in the form of a monomer; and another part of the natural gold exists in the form of inclusion, and the inclusion gold is mainly wrapped in the pyrite and is distributed in the pyrite fracture in a small amount.

The gold ore beneficiation method is a gravity-flotation combined process flow for returning to the coarse and fine classification operation after ore grinding, coarse and fine classification, coarse grain gravity separation, fine grain flotation and middling regrinding are carried out on minerals, and comprises the following beneficiation steps:

(a) grinding the minerals to-0.074 mm content of 45% by a ball mill, and then feeding the ground minerals into a high-frequency vibrating screen to obtain a plus 0.074mm coarse fraction material and a-0.074 mm fine fraction material;

(b) coarsely selecting the +0.074mm coarse fraction material obtained in the step (a) by adopting a spiral chute and a table concentrator to obtain coarse gold concentrate 1, merging the middlings in the spiral chute and table concentrator tailings, grinding the middlings in the spiral chute and table concentrator tailings in a ball mill until the content of-0.074 mm is 80%, returning to a high-frequency vibrating screen, merging the materials after grinding the minerals, and grading, and discharging the tailings in the spiral chute 1 to a tailing pond;

(c) and (b) carrying out flotation on the fine-grained materials with the particle size of-0.074 mm obtained in the step (a) by using a flotation machine to produce fine-grained gold concentrate 2 and tailings 2, wherein the fine-grained gold concentrate 2 and the coarse-grained gold concentrate 1 obtained in the step (b) are combined to be used as gold concentrate, and the fine-grained flotation tailings 2 and the coarse-grained spiral chute tailings 1 obtained in the step (b) are combined to be tailings and discharged to a tailing pond.

The step (c) -0.074mm fine-grained materials are floated by a flotation machine, and the method specifically comprises the following steps:

the primary roughing comprises the following steps: adding an activating agent, a collecting agent and a foaming agent into the ore pulp to perform flotation on the gold minerals to obtain primary rougher concentrate and primary rougher tailings; the primary roughing tailings are used as feeding for primary scavenging, and the primary roughing concentrate is used as feeding for fine concentration; the collector comprises 25 parts by mass of mercaptobenzothiazole, 10 parts by mass of ammonium dibutyldithiophosphate, 3 parts by mass of soluble alkali (sodium hydroxide), 1 part by mass of fatty alcohol-polyoxyethylene ether and 60 parts by mass of solvent water; the carbon chain of the fatty alcohol-polyoxyethylene ether is C9, and the polymerization degree is 8; the foaming agent is terpineol oil; according to the feeding amount, the addition amount of the activating agent is 350g/t, the addition amount of the collecting agent is 350g/t, and the addition amount of the foaming agent is 45 g/t; the primary scavenging comprises: adding an activating agent, a collecting agent and a foaming agent into the primary rougher tailings to perform flotation on gold minerals to obtain primary scavenging concentrate and primary scavenging tailings; wherein the primary scavenging tailings are used as feeding ores for secondary scavenging, and the primary scavenging concentrate is used as middling and returned to the primary roughing operation; wherein the addition amount of the activating agent is 100g/t according to the ore feeding amount; the addition amount of the collecting agent is 80 g/t; the addition amount of the foaming agent is 20 g/t; the secondary scavenging comprises: adding an activating agent, a collecting agent and a foaming agent into the primary scavenging tailings to perform flotation on the gold minerals to obtain secondary scavenging concentrates and secondary scavenging tailings; wherein, the tailings of the secondary scavenging are used as the third scavenging feed ore, and the concentrate of the secondary scavenging is used as the middling to return to the primary scavenging operation; according to the ore feeding amount, the addition amount of the collecting agent is 40g/t, and the addition amount of the foaming agent is 8 g/t; the fine selection comprises the following steps: performing blank concentration by taking the primary roughing concentrate as the feeding ore of the primary concentration to obtain primary concentration concentrate and primary concentration tailings; returning the primary concentrated tailings to primary roughing operation, and taking the primary concentrated concentrate as feed ore for secondary concentration to carry out blank concentration to obtain secondary concentrated concentrate and secondary concentrated tailings; returning the secondary concentrated tailings to the primary concentration operation, and performing blank concentration on the secondary concentrated concentrate serving as the feed for the tertiary concentration to obtain tertiary concentrated concentrate and tertiary concentrated tailings; and the third concentration concentrate is used as gold concentrate 2, and the third concentration tailings return to the second concentration operation.

Through detection, closed circuit test indexes obtained in a laboratory are as follows: the gold grade in the ore is 3.80g/t, and after the gold is separated by the method, the gold grade in the gold concentrate is 49.73g/t, and the gold recovery rate is 93.49%.

Comparative example 1

The only difference from example 1 is that the minerals were floated directly without classification.

Through detection, closed circuit test indexes obtained in a laboratory are as follows: after the gold is selected by the method, the gold grade in the gold concentrate is 40.17g/t, and the gold recovery rate is 88.32%.

Comparative example 2

The only difference from example 1 was that the collector was replaced with an equal amount of butyl xanthate.

Through detection, closed circuit test indexes obtained in a laboratory are as follows: after the gold is selected by the method, the gold grade in the gold concentrate is 40.41g/t, and the gold recovery rate is 89.67%.

Comparative example 3

The only difference from example 1 was that the collector was replaced with an equal amount of butyl jettison.

Through detection, closed-circuit test indexes obtained in a laboratory are as follows: after the gold is selected by the method, the gold grade in the gold concentrate is 36.81g/t, and the gold recovery rate is 90.03%.

Comparative example 4

The comparative example is different from example 1 in that no fatty alcohol-polyoxyethylene ether is added to the raw materials, and the rest is the same as example 1.

Through detection, closed-circuit test indexes obtained in a laboratory are as follows: after the gold is selected by the method, the gold grade in the gold concentrate is 41.83g/t, and the gold recovery rate is 89.61%.

Comparative example 5

The only difference from example 1 is that the dibutyldithiophosphorammonium phosphate is replaced by an equal amount of pentylxanthate, and the other examples are the same as example 1.

Through detection, closed circuit test indexes obtained in a laboratory are as follows: after the gold is selected by the method, the gold grade in the gold concentrate is 40.55g/t, and the gold recovery rate is 89.43%.

Comparative example 6

The only difference from example 1 is that ammonium dibutyldithiophosphate was replaced with an equal amount of butyl xanthate, and the other examples were the same as example 1.

Through detection, closed circuit test indexes obtained in a laboratory are as follows: after the gold is selected by the method, the gold grade in the gold concentrate is 41.52g/t, and the gold recovery rate is 88.23%.

Comparative example 7

The only difference from example 1 is that dibutyl dithiophosphate was replaced with an equal amount of diisopropyl dithiophosphate, and the other examples are the same as example 1.

Through detection, closed circuit test indexes obtained in a laboratory are as follows: after the gold is selected by the method, the gold grade in the gold concentrate is 39.56g/t, and the gold recovery rate is 89.18%.

Comparative example 8

The difference from example 1 is only that fatty alcohol-polyoxyethylene ether is replaced by an equal amount of sodium di-sec-octyl maleate sulfonate, and the other is the same as example 1.

Through detection, closed-circuit test indexes obtained in a laboratory are as follows: after the gold is selected by the method, the gold grade in the gold concentrate is 40.11g/t, and the gold recovery rate is 89.68%.

From the results of the above examples and comparative examples, it can be seen that the mineral is recycled by a gravity-flotation combined process of grinding, coarse and fine classification, coarse grain gravity separation, fine grain flotation, middling regrinding and returning to the coarse and fine classification operation, coarse grain gold is recovered by a gravity separation method, fine and fine grain gold is recovered by a flotation method (using a specific medicament and a medicament system), coarse grain gold, fine grain gold and fine grain gold in the gold ore are effectively recovered, the difficulty in mineral separation and recovery of the coarse grain gold, the fine grain gold and the fine and fine grain gold is effectively solved, the gold mineral is efficiently recovered, and a high gold recovery rate is obtained.

The applicant declares that the present invention illustrates the detailed structural features of the present invention through the above embodiments, but the present invention is not limited to the above detailed structural features, that is, it does not mean that the present invention must be implemented depending on the above detailed structural features. It should be understood by those skilled in the art that any modifications of the present invention, equivalent substitutions of selected components of the present invention, additions of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.

The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are all within the protection scope of the present invention.

It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.

In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.

Claims (22)

1. The beneficiation method for the gold ore is characterized by comprising the following steps:

(1) grading gold-containing minerals to obtain coarse-grained ores and fine-grained ores, and sequentially carrying out chute roughing and table concentration on the coarse-grained ores to obtain concentrate A; the granularity of the coarse-grained ore is more than 74 mu m;

(2) performing flotation on the fine ore to obtain a concentrate B, and mixing the concentrate A and the concentrate B to obtain a gold concentrate; the particle size of the fine ore is less than or equal to 74 mu m;

the flotation comprises roughing, concentrating and scavenging; the collecting agent in the flotation comprises, by mass, 25-35 parts of mercaptobenzothiazole, 5-10 parts of ammonium dibutyldithiophosphate, 3-5 parts of soluble alkali, 0.3-1 part of fatty alcohol-polyoxyethylene ether and 55-60 parts of a solvent; the carbon chain of the fatty alcohol-polyoxyethylene ether is C7-C9, and the polymerization degree is 6-8.

2. A beneficiation process according to claim 1, wherein the raw material subjected to the table concentration in the step (1) is the concentrate subjected to the chute rougher flotation.

3. A beneficiation process according to claim 1, wherein middlings roughed in the chute of step (1) are reground back to the classification.

4. A beneficiation process according to claim 3, wherein the regrinding ends at 80-95% of the total mass of the material, with particle size in the material being 74 μm or less.

5. A beneficiation process according to claim 1, wherein the transverse slope of the table in the table refining step (1) is less than or equal to 10 °.

6. A beneficiation process according to claim 1, wherein the rougher flotation in step (2) is performed at least 1 time.

7. A beneficiation process according to claim 1, wherein the beneficiation in step (2) is performed at least 3 times.

8. A beneficiation process according to claim 1, wherein the scavenging of step (2) is performed at least 3 times.

9. A beneficiation process according to claim 1, wherein the agent used in the flotation of step (2) further comprises a frother and an activator.

10. A beneficiation process according to claim 9, wherein the activator comprises copper sulfate.

11. A beneficiation process according to claim 10, wherein the frothing agent comprises pine oil.

12. A beneficiation process according to claim 1, wherein the rougher flotation comprises adding a flotation agent to the pulp for flotation.

13. The beneficiation method according to claim 1, wherein the addition amount of the activator in the coarse flotation is 200-400 g/t.

14. A beneficiation method according to claim 1, wherein the addition amount of the foaming agent in the coarse flotation is 20 to 50 g/t.

15. A beneficiation method according to claim 1, wherein the addition amount of the collector in the coarse flotation is 100-400 g/t.

16. A beneficiation process according to claim 1, wherein the roughed concentrate is beneficiated.

17. A beneficiation process according to claim 1, wherein the beneficiation is blank beneficiation.

18. A beneficiation process according to claim 1, wherein the sweep is flotation of the roughed tailings.

19. The beneficiation method according to claim 1, wherein the amount of the activating agent added in the sweep process is 100-200 g/t.

20. A beneficiation process according to claim 1, wherein the frother is added in an amount of 10 to 20g/t in the sweep.

21. A beneficiation process according to claim 1, wherein the amount of collector added in the sweep is 50-100 g/t.

22. A beneficiation process according to any one of claims 1 to 21, wherein the beneficiation process comprises the steps of:

(1) grading gold-containing minerals to obtain coarse-grained ores and fine-grained ores, and sequentially carrying out chute roughing and table concentration on the coarse-grained ores to obtain concentrate A; the granularity of the coarse-grained ore is more than 74 mu m; the particle size of the fine ore is less than or equal to 74 mu m; the raw material selected by the table concentrator is the concentrate of the rough concentration of the chute; regrinding middlings obtained by the rough concentration of the chute and returning the middlings to the classification; the regrinding end point is that the granularity of particles in the material is less than or equal to 74 mu m and accounts for 80-95% of the total mass of the material; the transverse gradient of the shaking table in the fine selection of the shaking table is less than or equal to 10 degrees;

(2) performing flotation on the fine ore to obtain concentrate B, and mixing the concentrate A and the concentrate B to obtain gold concentrate;

the flotation comprises roughing, concentrating and scavenging; the collecting agent in the flotation comprises, by mass, 25-35 parts of mercaptobenzothiazole, 5-10 parts of ammonium dibutyldithiophosphate, 3-5 parts of soluble alkali, 0.3-1 part of fatty alcohol-polyoxyethylene ether and 55-60 parts of a solvent; the carbon chain of the fatty alcohol-polyoxyethylene ether is C7-C9, and the polymerization degree is 6-8; the roughing is carried out for at least 1 time; the concentration is carried out at least 3 times; the scavenging is carried out at least 3 times; the agents used in the flotation also comprise a foaming agent and an activating agent; the activator comprises copper sulfate; the foaming agent comprises pinitol oil; the roughing comprises adding a flotation agent into the ore pulp for flotation; the addition amount of the activating agent in the rough selection is 200-400 g/t; the addition amount of the foaming agent in the coarse selection is 20-50 g/t; the addition amount of the collecting agent in the rough selection is 100-400 g/t; the roughly selected concentrate is subjected to fine selection; the selection is blank selection; the scavenging is to perform flotation on the roughed tailings; the addition amount of the activating agent in the scavenging is 100-200 g/t; the addition amount of the foaming agent in the scavenging is 10-20 g/t; the addition amount of the collecting agent in the sweeping process is 50-100 g/t.