Inhibitor for zinc sulfide ore flotation and flotation method

Abstract

The invention relates to an inhibitor for zinc sulfide ore flotation and a flotation method, in particular to the technical field of mineral processing, and the inhibitor for zinc sulfide ore flotation comprises sodium pyrosulfite, tannin, carbonized sodium cyanurate and caustic alkali. According to the inhibitor provided by the invention, good selective inhibition performance is achieved when flotation is carried out on zinc sulfide ore through the synergistic effect of all the components, sodium pyrosulfite is decomposed to generate sulfite, the sulfite, tannin and carbonized sodium cyanurate form a composite adsorption layer, the surface of pyrite is firmly covered with the composite adsorption layer, meanwhile, the adsorption effect of a composite system on sphalerite is extremely weak, and the flotation effect is good. And the reaction of the sphalerite and the collecting agent is not affected, so that selective separation of the sphalerite and the collecting agent is achieved, and a good inhibition effect can be achieved with a small dosage in the flotation process.

Description

Technical Field

[0001] This invention relates to the field of mineral processing technology, specifically to a flotation inhibitor and flotation method for zinc sulfide ore. Background Technology

[0002] Zinc metal has good rolling properties, wear resistance and corrosion resistance. It can be combined with a variety of metals to form alloys with even better physical and chemical properties. It is widely used in electrical industry, machinery industry, military industry, metallurgical industry, chemical industry, light industry and pharmaceutical industry.

[0003] Zinc exists in nature mostly as sulfides. The main zinc-bearing mineral is sphalerite, with a small amount of oxide minerals such as smithsonite and hemimorphite. Sphalerite (including iron sphalerite) is the main source of zinc. Most sphalerite contains a certain amount of sulfur. Since zinc and sulfur have similar floatability, a large amount of sulfur inhibitor needs to be added during zinc flotation in order to obtain qualified zinc concentrate.

[0004] Currently, lime is the most widely used sulfur suppressant in zinc-sulfur ore beneficiation in industrial production. However, the use of lime has significant drawbacks. First, lime needs to be prepared into lime slurry before use, which is labor-intensive and poses safety hazards due to its strong alkalinity. Second, it is prone to scaling and pipe blockage during use, and large fluctuations in the amount added lead to large fluctuations in industrial production indicators. Third, adding a large amount of lime makes the flotation foam sticky, making pipeline transportation difficult and concentrate filtration challenging. Fourth, the tailings after using lime have high alkalinity, with a pH even greater than 10, making them impossible to discharge and placing enormous pressure on environmental protection. Fifth, the mining and burning of lime causes significant environmental pollution and severe damage to soil and water. With the tightening of national environmental protection policies, the mining and burning of lime will face difficulties, making the method of adding large amounts of lime for zinc-sulfur ore beneficiation unsustainable.

[0005] Therefore, how to separate zinc sulfide ore in a more environmentally friendly and efficient manner is an urgent problem to be solved in zinc sulfide ore beneficiation. Existing technologies use a combination of inhibitors to replace lime as the inhibitor for the flotation of zinc sulfide ore. For example, CN112774869A discloses a pyrite inhibitor, its preparation, and its application in copper-lead-zinc polymetallic sulfide ores. The pyrite inhibitor is made from the following raw materials in parts by weight: 10-20 parts acrylic acid, 5-10 parts polymer compound, 4-8 parts isopropanol, and 0.02-0.05 parts catalyst. The preparation method is simple, the dosage is small, the cost is low, the addition is safe, and the use is convenient. It is applied to the flotation of copper-lead-zinc polymetallic sulfide ores.

[0006] However, when flotation depressants are used for zinc sulfide ores, they still suffer from poor selectivity, resulting in poor zinc recovery. Summary of the Invention

[0007] In view of the problems existing in the prior art, the purpose of the present invention is to provide a flotation inhibitor and flotation method for zinc sulfide ore, so as to solve the defect that the sulfur inhibitor for zinc sulfide ore has poor inhibition selectivity, resulting in poor zinc recovery effect.

[0008] To achieve this objective, the present invention adopts the following technical solution:

[0009] In a first aspect, the present invention provides a zinc sulfide ore flotation inhibitor, the zinc sulfide ore flotation inhibitor comprising:

[0010] Sodium metabisulfite, tannins, sodium cyanurate carbide, and caustic soda.

[0011] The inhibitor provided by this invention exhibits excellent selective inhibition during the flotation of zinc sulfide ore by utilizing the synergistic effect between its components. Sodium metabisulfite decomposes to produce sulfite ions, which form a composite adsorption layer with tannins and sodium cyanurate carbide, firmly covering the surface of pyrite. At the same time, the adsorption effect of this composite system on sphalerite is extremely weak, and it will not affect the reaction between sphalerite and the collector, thereby achieving selective separation of the two. A small amount is required to achieve a good inhibition effect during the flotation process.

[0012] As a preferred technical solution of the present invention, the mass ratio of sodium metabisulfite, tannin, sodium cyanurate carbide and caustic alkali in the zinc sulfide ore flotation inhibitor is (1-4):(1-4):(1-4):1.

[0013] As a preferred embodiment of the present invention, the caustic alkali includes sodium hydroxide and / or potassium hydroxide.

[0014] Secondly, the present invention provides a flotation method for zinc sulfide ore, the flotation method comprising:

[0015] Activator, collector, frother and inhibitor as described in the first aspect are added to the slurry for roughing to obtain roughing concentrate and roughing tailings;

[0016] Add the inhibitor described in the first aspect to the roughing concentrate for further refining to obtain zinc concentrate product.

[0017] As a preferred embodiment of the present invention, particles ≤0.074mm in the slurry account for 50-85% of the total mass of the particles.

[0018] Preferably, the slurry has a mass concentration of 30-45%.

[0019] As a preferred embodiment of the present invention, the collector includes: aniline black powder.

[0020] Preferably, the activator includes copper sulfate.

[0021] Preferably, the foaming agent comprises: No. 2 oil.

[0022] Preferably, the amount of collector added in the coarse selection is 20-120 g / t.

[0023] Preferably, the amount of activator added in the coarse selection is 30-200 g / t.

[0024] Preferably, the amount of foaming agent added in the coarse selection is 10-40 g / t.

[0025] Preferably, the amount of inhibitor added in the coarse selection is 100-500 g / t.

[0026] As a preferred technical solution of the present invention, the coarse selection is performed at least once.

[0027] As a preferred embodiment of the present invention, the amount of inhibitor added in the selection process is 10-60 g / t.

[0028] Preferably, the selection process is performed at least three times.

[0029] Preferably, the selected middlings are sequentially returned to the previous operation.

[0030] As a preferred technical solution of the present invention, the roughing tailings are subjected to scavenging.

[0031] Preferably, a collector is added to the scanning process.

[0032] Preferably, the collector comprises: aniline black powder.

[0033] Preferably, the amount of the collector added is 3-20 g / t.

[0034] As a preferred embodiment of the present invention, the scanning is performed at least twice.

[0035] Preferably, the middlings obtained from the scavenging are sequentially returned to the previous operation.

[0036] Compared with existing technical solutions, the present invention has the following beneficial effects:

[0037] (1) The inhibitor provided by the present invention avoids the traditional technical solution of using a large amount of lime to inhibit the flotation of zinc by sulfur. It overcomes the disadvantages of the traditional lime method, such as foam stickiness leading to low zinc concentrate grade, calcium corrosion of pipelines and equipment, and high pH value of tailings water causing environmental pollution. It achieves environmentally friendly and efficient recovery of zinc and sulfur resources under lime-free conditions, with good economic and environmental benefits and application prospects. For the flotation of zinc sulfide ore, the zinc grade in the obtained concentrate is ≥50.21% and the recovery rate is ≥84.97%. Under the preferred scheme, the zinc grade in the concentrate is ≥51.13% and the recovery rate is ≥85.97%.

[0038] (2) The inhibitor provided by the present invention can inhibit the oxidation of pyrite surface, and at the same time adsorb the pyrite surface through hydrogen bonding and hydrophobic interaction, preventing it from binding with the collector and expanding the difference in floatability between pyrite and sphalerite; sodium metabisulfite decomposes to produce sulfite, which forms a composite adsorption layer with tannin and sodium cyanurate carbide, firmly covering the pyrite surface, but the adsorption effect of the composite system on sphalerite is extremely weak and will not affect the reaction between sphalerite and the collector, thereby achieving selective separation of the two.

[0039] (3) The inhibitor provided by the present invention has the characteristics of good selectivity and strong inhibition ability. It can achieve a good inhibition effect with a small amount of lime during the roughing process, overcoming the disadvantages of traditional lime use such as sticky foam, difficulty in improving concentrate grade, and pipeline blockage.

[0040] (4) The flotation method provided by the present invention has the advantages of being environmentally friendly and easy to operate. It realizes the environmentally friendly and efficient recovery of zinc and sulfur resources under lime-free conditions, and has good economic and environmental benefits and application prospects. Attached Figure Description

[0041] Figure 1 This is a schematic flowchart of the flotation method for zinc sulfide ore provided in an embodiment of the present invention.

[0042] The present invention will now be described in further detail. However, the examples described below are merely simplified examples of the present invention and do not represent or limit the scope of protection of the present invention. The scope of protection of the present invention is determined by the claims. Detailed Implementation

[0043] To better illustrate the present invention and facilitate understanding of its technical solutions, typical but non-limiting embodiments of the present invention are as follows:

[0044] To address the drawbacks of current zinc sulfide ore flotation using lime as an inhibitor, such as causing sticky foam leading to low zinc concentrate grades, calcium corrosion of pipelines and equipment, and high pH levels in tailings water causing environmental pollution, existing technologies employ a combination of inhibitors for optimization. However, existing inhibitors still suffer from poor selectivity, resulting in poor zinc recovery. Therefore, this invention optimizes the composition of the inhibitor to achieve excellent selectivity during zinc sulfide ore flotation, thereby improving zinc recovery. Specifically:

[0045] I. This embodiment provides a zinc sulfide ore flotation selection inhibitor, which includes:

[0046] Sodium metabisulfite, tannins, sodium cyanurate carbide, and caustic soda.

[0047] The mass ratio of sodium metabisulfite, tannin, sodium cyanurate carbide, and caustic alkali in the zinc sulfide ore flotation depressant is (1-4):(1-4):(1-4):1, for example, it can be 2:2:1:1, 3:2:2:1, 4:4:3:1, 4:4:4:1, 1:1:1:1, or 2:2:2:1, etc., but is not limited to the listed values. Other unlisted values ​​within this range also meet the requirements.

[0048] The caustic alkali includes sodium hydroxide and / or potassium hydroxide.

[0049] In this invention, the inhibitor is used by mixing the various agents according to the specified ratio.

[0050] II. This embodiment provides a flotation method for zinc sulfide ore, the process of which is as follows: Figure 1 As shown, the flotation method includes:

[0051] Activators, collectors, frothers and depressants are added to the slurry for roughing to obtain roughing concentrate and roughing tailings;

[0052] Adding inhibitors to the roughing concentrate for further refining yields zinc concentrate.

[0053] In this invention, the slurry is a slurry obtained by modulating zinc sulfide-containing tailings, such as adjusting the pH value, slurry concentration, and solid particle size distribution, to achieve the treatment of zinc sulfide-containing tailings. However, based on the difficulty of mineral processing, the flotation scheme provided by this invention is also applicable to the flotation of the same type of raw ore (which requires crushing, grinding, and classification of the raw ore to obtain a slurry that meets the specified requirements). This is because the difficulty of tailings reprocessing in this field is significantly higher than that of raw ore flotation. Tailings are discarded materials obtained after flotation, and flotation reagents are added during the flotation process, which significantly affects the floatability of the discarded materials, resulting in a significantly reduced floatability compared to the same type of raw ore.

[0054] In this invention, the pH value of the slurry is 7-9, for example, it can be 7, 7.2, 7.4, 7.6, 7.8, 8, 8.2, 8.4, 8.6, 8.8 or 9, but is not limited to the listed values. Other unlisted values ​​within this range are also acceptable.

[0055] In this invention, the foam product obtained from the roughing process is the roughing concentrate.

[0056] In this invention, the addition amount (g / t) is based on the mass of zinc sulfide ore, with the corresponding g of flotation reagent added per ton of zinc sulfide ore.

[0057] The slurry contains particles ≤0.074mm, which account for 50-85% of the total particle mass. For example, it can be 50%, 53.5%, 57%, 60.5%, 64%, 67.5%, 71%, 74.5%, 78%, 81.5%, or 85%, but is not limited to the listed values. Other unlisted values ​​within this range also meet the requirements.

[0058] The mass concentration of the slurry is 30-45%, for example, it can be 30%, 31.5%, 33%, 34.5%, 36%, 37.5%, 39%, 40.5%, 42%, 43.5% or 45%, etc., but is not limited to the listed values. Other unlisted values ​​within this range are also acceptable.

[0059] The collector includes aniline black powder.

[0060] The activator includes copper sulfate.

[0061] The foaming agent includes: No. 2 oil.

[0062] The inhibitors include sodium metabisulfite, tannin, sodium cyanurate carbide, and caustic soda in a mass ratio of (1-4):(1-4):(1-4):1, such as 2:2:1:1, 3:2:2:1, 4:4:3:1, 4:4:4:1, 1:1:1:1, or 2:2:2:1, but are not limited to the listed values. Other unlisted values ​​within this range are also acceptable.

[0063] The amount of collector added in the coarse selection is 20-120 g / t, for example, it can be 20 g / t, 30 g / t, 40 g / t, 50 g / t, 60 g / t, 70 g / t, 80 g / t, 90 g / t, 100 g / t, 110 g / t or 120 g / t, but is not limited to the listed values. Other unlisted values ​​within this range also meet the requirements.

[0064] The amount of activator added in the coarse selection is 30-200 g / t, for example, it can be 30 g / t, 47 g / t, 64 g / t, 81 g / t, 98 g / t, 115 g / t, 132 g / t, 149 g / t, 166 g / t, 183 g / t or 200 g / t, etc., but is not limited to the listed values. Other unlisted values ​​within this range also meet the requirements.

[0065] The amount of foaming agent added in the coarse selection is 10-40 g / t, for example, it can be 10 g / t, 13 g / t, 16 g / t, 19 g / t, 22 g / t, 25 g / t, 28 g / t, 31 g / t, 34 g / t, 37 g / t or 40 g / t, etc., but is not limited to the listed values. Other unlisted values ​​within this range also meet the requirements.

[0066] The amount of inhibitor added in the coarse selection is 100-500 g / t, for example, it can be 100 g / t, 140 g / t, 180 g / t, 220 g / t, 260 g / t, 300 g / t, 340 g / t, 380 g / t, 420 g / t, 460 g / t or 500 g / t, etc., but is not limited to the listed values. Other unlisted values ​​within this range are also acceptable.

[0067] The coarse selection is performed at least once, for example, once, twice, three times, four times, five times, six times, seven times, eight times, nine times, or ten times, but is not limited to the listed values. Other unlisted values ​​within this range also meet the requirements.

[0068] In this invention, when the roughing process is performed multiple times, the amount of flotation reagent added during the process is the total amount added. The specific dosage distribution for each process can be designed according to the requirements of the art. For example, if two roughing processes are performed, the total amount of collector added during the two roughing processes is 20-120 g / t.

[0069] The amount of inhibitor added in the selected process is 10-60 g / t, for example, it can be 10 g / t, 15 g / t, 20 g / t, 25 g / t, 30 g / t, 35 g / t, 40 g / t, 45 g / t, 50 g / t, 55 g / t or 60 g / t, etc., but is not limited to the listed values. Other unlisted values ​​within this range are also acceptable.

[0070] The selection process shall be performed at least three times, for example, three, four, five, six, seven, eight, nine, or ten times, but is not limited to the listed values. Other unlisted values ​​within this range are also acceptable.

[0071] In this invention, the amount of inhibitor added during the selection process is the total amount of the drug added during the selection process. The specific dosage distribution for each selection can be designed according to the requirements of the art. For example, if three selection processes are carried out, the total amount of inhibitor added during the three selection processes is 10-60 g / t. The amount of inhibitor added in the first selection is 5-30 g / t, the amount of inhibitor added in the second selection is 4-20 g / t, and the amount of inhibitor added in the third selection is 1-10 g / t.

[0072] The selected medium-grade ore is sequentially returned to the previous operation.

[0073] The roughing tailings are then subjected to scavenging.

[0074] The scanning process includes the addition of a collector.

[0075] The collector includes aniline black powder.

[0076] The amount of the collector added is 3-20 g / t, for example, it can be 3 g / t, 4.7 g / t, 6.4 g / t, 8.1 g / t, 9.8 g / t, 11.5 g / t, 13.2 g / t, 14.9 g / t, 16.6 g / t, 18.3 g / t or 20 g / t, but is not limited to the listed values. Other unlisted values ​​within this range also meet the requirements.

[0077] The scanning process shall be performed at least twice, for example, twice, three times, four times, five times, six times, seven times, eight times, nine times, or ten times, but is not limited to the listed values. Other unlisted values ​​within this range are also acceptable.

[0078] The middlings obtained from the scavenging are sequentially returned to the previous operation.

[0079] In this invention, the amount of collector added during scavenging is the total amount of reagent added during the scavenging process. For example, if three scavenging processes are performed, the total amount of collector added during the three scavenging processes is 3-20 g / t.

[0080] III. To illustrate the inhibitory effect achievable by the zinc sulfide ore flotation depressant provided by this invention, the following practical example is used for explanation:

[0081] Example 1

[0082] The lead tailings from a certain lead-zinc mine contain 5.71% Zn and 10.13% S by mass percentage. The flotation process adopts a roughing, scavenging, and cleaning process. The middlings from the first cleaning and scavenging are returned to the roughing process. The middlings from the second and third cleanings are returned to the previous cleaning operation in turn. The middlings from the second scavenging are returned to the first scavenging operation.

[0083] Specifically as follows:

[0084] (1) Lead tailings from lead-zinc ore with a fineness of -0.074mm accounting for 65% were mixed with water to adjust the slurry concentration to 36%. After adjusting the slurry, the pH value was controlled to 8. 200g / t of inhibitor, 100g / t of activator, 60g / t of collector, and 20g / t of frother were added in sequence. After one roughing process, zinc rough concentrate and tailings with foam products were obtained. The inhibitor was a combination of sodium metabisulfite, tannin, sodium cyanurate carbide and sodium hydroxide in a mass ratio of 2:2:2:1; the activator was copper sulfate; the collector was aniline black powder; and the frother was No. 2 oil.

[0085] (2) The tailings obtained after roughing in step (1) are subjected to two scavenging processes. The amount of collector added during the scavenging process is 10g / t and 10g / t respectively. The middlings obtained after scavenging are returned to the previous operation for further separation.

[0086] (3) Add inhibitors to the zinc crude concentrate obtained in step (1). The inhibitors are a combination of sodium metabisulfite, tannin, sodium cyanurate carbide and sodium hydroxide in a mass ratio of 2:2:2:1. Perform three cleaning operations: add 35g / t of inhibitor for cleaning one, add 15g / t of inhibitor for cleaning two, and add 5g / t of inhibitor for cleaning three. After the cleaning is completed, the zinc concentrate product is obtained.

[0087] Example 2

[0088] The lead tailings from a certain lead-zinc mine contain 3.64% Zn and 8.13% S by mass percentage. The flotation process adopts a roughing, scavenging, and cleaning process. The middlings from the first cleaning and scavenging are returned to the roughing process, the middlings from the second and third cleaning are returned to the previous cleaning operation, and the middlings from scavenging are returned to scavenging operation 1.

[0089] Specifically as follows:

[0090] (1) Lead tailings from lead-zinc ore with a fineness of -0.074mm accounting for 60% were mixed with water to adjust the slurry concentration to 38%. After adjusting the slurry, the pH value was controlled to 8. 180g / t of inhibitor, 80g / t of activator, 40g / t of collector, and 15g / t of frother were added in sequence. After one roughing process, zinc rough concentrate and tailings with foam products were obtained. The inhibitor was a combination of sodium metabisulfite, tannin, sodium cyanurate carbide and sodium hydroxide in a mass ratio of 1:3:2:1; the activator was copper sulfate; the collector was aniline black powder; and the frother was No. 2 oil.

[0091] (2) The tailings obtained after the roughing in step (1) are subjected to two scavenging processes. The amount of collector added during the scavenging process is 6g / t and 6g / t respectively. The middlings obtained after scavenging are returned to the previous operation for further separation.

[0092] (3) Add inhibitors to the zinc crude concentrate obtained in step (1). The inhibitors are a combination of sodium metabisulfite, tannin, sodium cyanurate carbide and sodium hydroxide in a mass ratio of 1:3:2:1. Perform three cleaning operations: add 30g / t of inhibitor for cleaning one, add 15g / t of inhibitor for cleaning two, and add 5g / t of inhibitor for cleaning three. After the cleaning is completed, the zinc concentrate product is obtained.

[0093] Example 3

[0094] The lead tailings from a certain lead-zinc mine contain 2.37% Zn and 5.16% S by mass percentage. The flotation process adopts a roughing, scavenging, and cleaning process. The middlings from the first cleaning and scavenging are returned to the roughing process. The middlings from the second and third cleanings are returned to the previous cleaning operation in turn. The middlings from the second scavenging are returned to the first scavenging operation.

[0095] Specifically as follows:

[0096] (1) Lead tailings from lead-zinc ore with a fineness of -0.074mm accounting for 55% were mixed with water to adjust the slurry concentration to 40%. After adjusting the slurry, the pH value was controlled to 7. 150g / t of inhibitor, 65g / t of activator, 30g / t of collector, and 10g / t of frother were added in sequence. After one roughing process, foam products of zinc rough concentrate and tailings were obtained. The inhibitor was a combination of sodium metabisulfite, tannin, sodium cyanurate carbide, and sodium hydroxide in a mass ratio of 2:3:3:1; the activator was copper sulfate; the collector was aniline black powder; and the frother was No. 2 oil.

[0097] (2) The tailings obtained after roughing in step (1) are subjected to two scavenging processes. The amount of collector added during the scavenging process is 4g / t and 4g / t respectively. The middlings obtained after scavenging are returned to the previous operation for further separation.

[0098] (3) Add inhibitors to the zinc crude concentrate obtained in step (1). The inhibitors are a combination of sodium metabisulfite, tannin, sodium cyanurate carbide and sodium hydroxide in a mass ratio of 2:3:3:1. Perform three cleaning operations: add 20 g / t of inhibitor for cleaning one, add 10 g / t of inhibitor for cleaning two, and add 5 g / t of inhibitor for cleaning three. After the cleaning is completed, the zinc concentrate product is obtained.

[0099] Example 4

[0100] The lead tailings from a certain lead-zinc mine contain 0.91% Zn and 2.66% S by mass percentage. The flotation process adopts a roughing, scavenging, and cleaning process. The middlings from the first cleaning and scavenging are returned to the roughing process, the middlings from the second and third cleaning are returned to the previous cleaning operation, and the middlings from scavenging are returned to scavenging operation.

[0101] Specifically as follows:

[0102] (1) Lead tailings from lead-zinc ore with a fineness of -0.074mm accounting for 75% were mixed with water to adjust the slurry concentration to 34%. After adjusting the slurry, the pH value was controlled to 8. 120g / t of inhibitor, 50g / t of activator, 25g / t of collector, and 10g / t of frother were added in sequence. After one roughing process, zinc rough concentrate and tailings with foam products were obtained. The inhibitor was a combination of sodium metabisulfite, tannin, sodium cyanurate carbide and sodium hydroxide in a mass ratio of 2:3:3:1; the activator was copper sulfate; the collector was aniline black powder; and the frother was No. 2 oil.

[0103] (2) The tailings obtained after the roughing in step (1) are subjected to two scavenging processes. The amount of collector added during the scavenging process is 3g / t and 3g / t respectively. The middlings obtained after scavenging are returned to the previous operation for further separation.

[0104] (3) Add inhibitors to the zinc crude concentrate obtained in step (1). The inhibitors are a combination of sodium metabisulfite, tannin, sodium cyanurate carbide and sodium hydroxide in a mass ratio of 2:3:3:1. Perform three cleaning operations: add 15g / t of inhibitor for cleaning one, add 10g / t of inhibitor for cleaning two, and add 5g / t of inhibitor for cleaning three. After the cleaning is completed, the zinc concentrate product is obtained.

[0105] Example 5

[0106] The only difference from Example 1 is that the mass ratio of sodium metabisulfite, tannin, sodium cyanurate carbide, and caustic soda in all inhibitors is 0.5:2:2:1.

[0107] Example 6

[0108] The only difference from Example 1 is that the mass ratio of sodium metabisulfite, tannin, sodium cyanurate carbide, and caustic soda in all inhibitors is 5:2:2:1.

[0109] Example 7

[0110] The only difference from Example 1 is that the mass ratio of sodium metabisulfite, tannin, sodium cyanurate carbide, and caustic soda in all inhibitors is 2:0.5:2:1.

[0111] Example 8

[0112] The only difference from Example 1 is that the mass ratio of sodium metabisulfite, tannin, sodium cyanurate carbide, and caustic soda in all inhibitors is 2:5:2:1.

[0113] Example 9

[0114] The only difference from Example 1 is that the mass ratio of sodium metabisulfite, tannin, sodium cyanurate carbide, and caustic soda in all inhibitors is 2:2:0.5:1.

[0115] Example 10

[0116] The only difference from Example 1 is that the mass ratio of sodium metabisulfite, tannin, sodium cyanurate carbide, and caustic soda in all inhibitors is 2:2:5:1.

[0117] Comparative Example 1

[0118] The difference from Example 1 is that the inhibitor used is lime, and the dosage is 2000g / t; all other aspects are the same as in Example 1.

[0119] Comparative Example 2

[0120] The difference from Example 1 is that the inhibitor used is a combination of sodium metabisulfite, tannin and sodium cyanurate in a mass ratio of 2:2:2, while all other aspects are the same as in Example 1.

[0121] Comparative Example 3

[0122] The difference from Example 1 is that the inhibitor used is a combination of tannin, sodium cyanurate carbide and sodium hydroxide in a mass ratio of 2:2:1, while all other aspects are the same as in Example 1.

[0123] Comparative Example 4

[0124] The difference from Example 1 is that the inhibitor used is a combination of sodium metabisulfite, sodium cyanurate carbide, and sodium hydroxide in a mass ratio of 2:2:1, while all other aspects are the same as in Example 1.

[0125] Comparative Example 5

[0126] The difference from Example 1 is that the inhibitor used is a combination of sodium metabisulfite, tannin and sodium hydroxide in a mass ratio of 2:2:1, while all other aspects are the same as in Example 1.

[0127] Comparative Example 6

[0128] The only difference from Example 1 is that sodium metabisulfite is replaced with an equal amount of sodium thiophosphate.

[0129] Comparative Example 7

[0130] The only difference from Example 1 is that sodium cyanurate carbonization is replaced with an equal amount of carboxymethyl cellulose.

[0131] Example 8

[0132] The only difference from Example 1 is that the tannins are replaced with an equal amount of carboxymethyl cellulose.

[0133] Comparative Example 9

[0134] The only difference from Example 1 is that sodium cyanurate carbonization is replaced with an equal amount of sodium humate.

[0135] Comparative Example 10

[0136] The only difference from Example 1 is that sodium metabisulfite is replaced with an equal amount of calcium hypochlorite.

[0137] Comparative Example 11

[0138] The only difference from Example 1 is that the tannins are replaced with an equal amount of rhein.

[0139] The indicators of the concentrate products obtained from the above embodiments and comparative examples are detailed in Table 1 below.

[0140] Table 1

[0141]

[0142] As shown in Table 1, the zinc sulfide ore flotation method and depressant provided by this invention achieves good selective inhibition by means of the synergistic effect between the components, thus solving the defect of poor zinc recovery caused by poor selectivity of zinc sulfide ore depressant. Compared with conventional zinc sulfide ore flotation technology, it has advantages such as environmental protection and ease of operation. It realizes environmentally friendly and efficient recovery of zinc sulfide ore resources under lime-free conditions, and has good economic and environmental benefits and application prospects.

[0143] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0144] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0145] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A depressant for the flotation of zinc sulfide ore, characterized in that, The zinc sulfide ore flotation depressant includes: Sodium metabisulfite, tannins, sodium cyanurate carbide, and caustic soda.

2. The zinc sulfide ore flotation depressant as described in claim 1, characterized in that, The mass ratio of sodium metabisulfite, tannin, sodium cyanurate carbide, and caustic soda in the zinc sulfide ore flotation depressant is (1-4):(1-4):(1-4):

1.

3. The zinc sulfide ore flotation depressant as described in claim 1, characterized in that, The caustic alkali includes sodium hydroxide and / or potassium hydroxide.

4. A flotation method for zinc sulfide ore, characterized in that, The flotation method includes: An activator, a collector, a frother, and an inhibitor as described in any one of claims 1-3 are added to the slurry for roughing to obtain a roughing concentrate and a roughing tailings. Add the inhibitor as described in any one of claims 1-3 to the roughing concentrate for further refining to obtain zinc concentrate product.

5. The flotation method as described in claim 4, characterized in that, The slurry contains 50-85% particles ≤0.074mm in size. Preferably, the slurry has a mass concentration of 30-45%.

6. The flotation method as described in claim 4, characterized in that, The collector includes: aniline black powder; Preferably, the activator includes: copper sulfate; Preferably, the foaming agent comprises: No. 2 oil; Preferably, the amount of collector added in the coarse selection is 20-120 g / t; Preferably, the amount of activator added in the coarse selection is 30-200 g / t; Preferably, the amount of foaming agent added in the coarse selection is 10-40 g / t; Preferably, the amount of inhibitor added in the coarse selection is 100-500 g / t.

7. The flotation method as described in claim 4, characterized in that, The coarse selection is performed at least once.

8. The flotation method as described in claim 4, characterized in that, The amount of inhibitor added in the selected process is 10-60g / t; Preferably, the selection process is performed at least three times; Preferably, the selected middlings are sequentially returned to the previous operation.

9. The flotation method as described in claim 4, characterized in that, The roughing tailings are then subjected to scavenging. Preferably, a collector is added to the scanning agent; Preferably, the collector comprises: aniline black powder; Preferably, the amount of the collector added is 3-20 g / t.

10. The flotation method as described in claim 9, characterized in that, The scanning process shall be performed at least twice; Preferably, the middlings obtained from the scavenging are sequentially returned to the previous operation.

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