A flotation agent for high-mud, high-oxidation-rate, low-grade zinc oxide ore and its application

Abstract

This invention relates to a flotation agent for low-grade zinc oxide ore with high mud content and high oxidation rate. The flotation agent consists of a gangue inhibitor and a zinc oxide collector. The gangue inhibitor is a homogeneous mixture of carboxymethyl cellulose, tetrasodium pyrophosphate, larch tannin, and calcium lignin sulfonate in a weight ratio of 0.5-0.8:4:2:1. The zinc oxide collector is made from dodecylamine acetate, n-octanol, 2-hydroxybenzaldehyde oxime, and octylhydroxamic acid. The invention also discloses the application of this flotation agent. The inhibitor of this invention has a significant inhibitory effect on gangue minerals and effectively solves the problems of poor zinc oxide sulfidation caused by mud covering and difficulty in adsorbing the collector onto the zinc oxide surface. The collector enhances the collection of zinc oxide minerals and reduces the amount of collector required.

Description

Technical Field

[0001] This invention relates to the field of mineral flotation and separation technology in the field of non-ferrous metal beneficiation technology, and particularly to a flotation agent for high-mud, high-oxidation-rate, low-grade zinc oxide ore and its application. Background Technology

[0002] Zinc oxide is an important mineral resource of zinc. my country has abundant zinc oxide ore resources, which are concentrated in the southwest and northwest regions. The composition of zinc oxide ore in my country is complex, with a wide variety of minerals, often intermingled and associated, with fine particle size, severe mudification, and containing a certain amount of soluble salts, iron oxide, and clay slime. These gangue minerals easily generate large amounts of secondary slime during mining, transportation, crushing, and grinding. Currently, there is limited data available for the flotation of low-grade, fine-grained zinc oxide in deep oxidation processes, which is a major challenge in this field. Some conventional flotation processes and reagents are difficult to adapt to the complex and variable properties of zinc oxide ores, resulting in significant losses of fine-grained zinc oxide during industrial production, making enrichment and efficient recovery difficult. Therefore, improving the beneficiation indicators of zinc oxide ore and enhancing economic efficiency is one of the key issues facing mining production and research.

[0003] Domestic and international research on flotation reagents for zinc oxide ore has largely focused on the development and application of novel, highly efficient collectors and modifiers, with a particular emphasis on collectors. However, research on modifiers mostly employs combined reagents based on the differences in ore properties. This reflects the future research direction for flotation reagents for zinc oxide ore.

[0004] Zinc oxide ores are often complex in composition, high in clay content, and have high oxidation rates, leading to significant challenges in beneficiation and low recovery rates. Many research findings also cannot be applied to industrial production due to technical or economic reasons, thus failing to generate direct economic benefits. Therefore, strengthening research on the flotation theory of zinc oxide ore and the enhancing effects and mechanisms of the sulfidation process, as well as developing highly efficient new reagents and combined reagents, is of great significance for improving the comprehensive utilization rate of resources. Summary of the Invention

[0005] The technical problem to be solved by this invention is to provide a flotation agent for high-mud, high-oxidation-rate, low-grade zinc oxide ore with high beneficiation recovery rate.

[0006] Another technical problem to be solved by this invention is to provide an application of flotation agents for high-mud, high-oxidation-rate, low-grade zinc oxide ores.

[0007] To address the aforementioned problems, the present invention provides a flotation agent for low-grade zinc oxide ore with high mud content and high oxidation rate, characterized in that: the flotation agent comprises a gangue inhibitor and a zinc oxide collector; the gangue inhibitor is uniformly mixed from carboxymethyl cellulose, tetrasodium pyrophosphate, larch tannin, and calcium lignin sulfonate in a weight ratio of 0.5~0.8:4:2:1; the zinc oxide collector is made from dodecylamine acetate, n-octanol, 2-hydroxybenzaldehyde oxime, and octylhydroxamic acid.

[0008] The zinc oxide collector is prepared by the following method:

[0009] (1) Weigh out 50-60 parts by weight of dodecylamine acetate, 10-15 parts of n-octanol, 10-15 parts of octylhydroxamic acid, and 10-20 parts of 2-hydroxybenzaldehyde oxime;

[0010] (2) In a stirred tank, dodecylamine acetate is first added under normal pressure and heated to 60-70°C. After the dodecylamine acetate changes from solid to liquid, n-octanol, octylhydroxamic acid, and 2-hydroxybenzaldehyde oxime are added in sequence and stirred for 1-1.5 hours to form a homogeneous oily solution.

[0011] (3) The homogeneous oily solution is cooled to room temperature to form a viscous solid, which is then obtained.

[0012] The application of the flotation agent for high-mud, high-oxidation, low-grade zinc oxide ore as described above is characterized by the following method: The flotation agent is used in the roughing operation of high-mud, high-oxidation, low-grade zinc oxide ore according to the following method:

[0013] ① Prepare an aqueous solution A with a concentration of 1~2% using warm or hot water; the amount of zinc oxide collector used is 80~120g / t based on the dry weight of the ore;

[0014] ② Prepare an aqueous solution B using butyl xanthate with warm or hot water; the amount of butyl xanthate used is 30~50 g / t based on the dry weight of the ore;

[0015] ③ After the aqueous solution A and the aqueous solution B are mixed evenly, they are added to the slurry, and the mass ratio of the zinc oxide collector to the butyl xanthate aqueous solution is 3:1 to 4:1; at the same time, a gangue inhibitor aqueous solution with a weight percentage concentration of 5% to 10% is added, and the amount of gangue inhibitor is 1200 to 1800 g / t based on the dry weight of the ore.

[0016] The application of the flotation agent for high-mud, high-oxidation-rate, low-grade zinc oxide ore as described above is characterized in that: when the gangue inhibitor in the flotation agent is used for a single cleaning operation of high-mud, high-oxidation-rate, low-grade zinc oxide ore, 300~500g / t of gangue inhibitor is added to the zinc rough concentrate slurry based on the dry weight of the zinc oxide ore.

[0017] The application of the flotation agent for high-mud, high-oxidation-rate, low-grade zinc oxide ore as described above is characterized in that: when the zinc oxide collector in the flotation agent is used for a single scavenging operation of high-mud, high-oxidation-rate, low-grade zinc oxide ore, 20~30g / t of zinc oxide collector is added to the roughing tailings slurry based on the dry weight of the zinc oxide ore.

[0018] The zinc content in the raw ore of the high-mud, high-oxidation-rate, low-grade zinc oxide ore is 3.0~6.0%, the zinc oxidation rate is ≥85%, and the content of mud particles with a size of less than 20μm in the primary mud is not less than 25%.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1. The gangue inhibitor in this invention is made of carboxymethyl cellulose, tetrasodium pyrophosphate, larch tannin, and calcium lignin sulfonate. This inhibitor removes the surface activity of calcium-magnesium gangue minerals and forms a hydrophilic film on their surface, enhancing the difference in floatability between calcium-magnesium gangue minerals and zinc oxide minerals. Simultaneously, the inhibitor strongly adsorbs onto the surface of calcium-magnesium gangue minerals, reducing the interfacial tension between the solid and liquid phases, keeping the gangue minerals in a highly dispersed and stable state, effectively preventing the adhesion and encapsulation of gangue minerals on the zinc oxide surface.

[0021] (1) Carboxymethyl cellulose is an inhibitor of calcium and magnesium gangue. The carboxyl anion in carboxymethyl cellulose can electrostatically adsorb with the cations on the surface of mineral lattice. The hydroxyl groups in carboxymethyl cellulose molecules form a water film with water through hydrogen bonds, thereby enhancing the hydrophilicity of calcium and magnesium gangue minerals such as talc, pyroxene, serpentine, and chlorite.

[0022] (2) Sodium pyrophosphate undergoes a complexation reaction with metal ions in gangue minerals to form insoluble complexes that are deposited on the mineral surface. This results in strong hydrophilicity of the gangue minerals, reduces the number of active sites on the gangue mineral surface, and increases the strength and thickness of the hydration film, significantly reducing its interaction with the collector. At the same time, sodium pyrophosphate can achieve a good dispersion state in the mineral particle system, effectively avoiding the mutual aggregation of mixed particles or the covering of sludge, alleviating heterogeneous aggregation, and making it easier for sodium sulfide to form a sulfide film on the surface of zinc oxide minerals.

[0023] (3) The polar groups -OH and -COOH of larch tannin are fixed on the surface of calcium-magnesium gangue such as calcite. The carboxyl or hydroxyl groups at its ends combine with water molecules and become hydrophilic, thus inhibiting the calcium-magnesium gangue of calcite. The inhibitory effect is also achieved by the phenolic ions being fixed on the surface of calcium-magnesium gangue through physical adsorption or chemical adsorption.

[0024] (4) Calcium lignin sulfonate contains multiple groups such as aliphatic, aryl, sulfonic acid, hydroxyl, and carboxyl groups. Lignin is adsorbed onto the surface of talc and dolomite by complexing with calcium particles on the surface of talc through hydrogen bonds and chemical bonds. The calcium ions in calcium lignin sulfonate promote the ionization of the weakly acidic groups in lignin sulfonate, thereby reducing the electrostatic repulsion between lignin sulfonate and the mineral surface, increasing the adsorption amount of lignin sulfonate on the surface of talc and dolomite, and strengthening the inhibitory effect of calcium lignin sulfonate on talc and dolomite.

[0025] 2. The zinc oxide mineral collector in this invention is made from dodecylamine acetate, n-octanol, 2-hydroxybenzaldehyde oxime, and octyl hydroxamic acid. In use, the zinc oxide mineral collector (prepared as a 1-2% aqueous solution with warm or hot water) and butyl xanthate are first prepared separately into aqueous solutions. Then, they are thoroughly mixed at a solute mass ratio of 3:1 to 4:1 using a funnel-shaped device capable of rotating and mixing before being added to the slurry. This zinc oxide collector is formulated based on differences in collector structure and performance, and the complementary functions between reagents. Other collectors are interspersed and adsorbed between adjacent dodecylamine acetate molecules, shielding the electrostatic repulsion between their head groups, increasing the hydrophobic association between nonpolar groups, thereby increasing the adsorption amount of dodecylamine acetate on the zinc oxide surface. This fully utilizes the synergistic effect between collectors and enhances the collecting effect of dodecylamine acetate on zinc oxide minerals. Simultaneously, the mixed use of this zinc oxide collector and butyl xanthate can reduce the harmful effects of slime on flotation.

[0026] (1) Strong van der Waals forces exist between the hydrocarbon chain of n-octanol and the nonpolar group of dodecylamine. Under the influence of these van der Waals forces, n-octanol and dodecylamine molecules associate, resulting in "co-adsorption" on the mineral surface. In addition, since the nitrogen and oxygen atoms in amine and alcohol molecules have high electronegativity, hydrogen bonds can be formed between them, increasing the adsorption density on the surface of the zinc oxide mineral and thus enhancing its hydrophobicity.

[0027] (2) 2-Hydroxybenzaldehyde oxime, through chelation with zinc ions, forms a chelate that binds to amine molecules or amine ions via hydrogen bonds, promoting the formation of multilayer adsorption on the surface of smithsonite. Simultaneously, it can increase the HS-... - The adsorption thickness on the zinc oxide surface significantly increases the buoyancy activity of zinc oxide minerals.

[0028] (3) The N and O of octyl hydroxamic acid react with the Zn on the surface of smithsonite. 2+ Direct bonding generates stable chelates, which greatly improves the hydrophobicity of smithsonite. At the same time, the selective collection performance of this collector is significantly enhanced when gangue inhibitors are added.

[0029] (4) When the zinc oxide collector is mixed with butyl xanthate and added, the amine xanthate complex (white or pale yellow emulsion) is co-adsorbed on the surface of smithsonite. The presence of xanthate in the mixed collector reduces the electrostatic repulsion between the smithsonite mineral surface and amine ions, while also enhancing the degree of hydrophobic association of the lateral nonpolar groups of the two collectors, thereby strengthening the collection of zinc oxide minerals and reducing the amount of collector required. Detailed Implementation

[0030] A flotation agent for high-mud, high-oxidation-rate, low-grade zinc oxide ore is provided, comprising a gangue inhibitor and a zinc oxide collector. The gangue inhibitor is a mixture of carboxymethyl cellulose, tetrasodium pyrophosphate, larch tannin, and calcium lignin sulfonate in a weight ratio of 0.5-0.8:4:2:1 (g / g). The zinc oxide collector is made from dodecylamine acetate, n-octanol, 2-hydroxybenzaldehyde oxime, and octylhydroxamic acid.

[0031] The zinc oxide collector is prepared by the following method:

[0032] (1) Weigh 50-60 parts of dodecylamine acetate, 10-15 parts of n-octanol, 10-15 parts of octylhydroxamic acid, and 10-20 parts of 2-hydroxybenzaldehyde oxime by weight (g);

[0033] (2) In a stirred tank, dodecylamine acetate is first added under normal pressure and heated to 60-70°C. After dodecylamine acetate changes from solid to liquid, n-octanol, octyl hydroxamic acid, and 2-hydroxybenzaldehyde oxime are added in sequence and stirred for 1-1.5 hours to form a homogeneous oily solution.

[0034] (3) The homogeneous oily solution is cooled to room temperature to form a viscous solid, which is then obtained.

[0035] Application of a flotation agent for high-mud, high-oxidation, low-grade zinc oxide ore: This flotation agent is used in the roughing process of high-mud, high-oxidation, low-grade zinc oxide ore as follows:

[0036] ① Prepare an aqueous solution A with a concentration of 1~2% using warm or hot water; the amount of zinc oxide collector used is 80~120g / t based on the dry weight of the ore;

[0037] ② Prepare an aqueous solution B using butyl xanthate with warm or hot water; the dosage of butyl xanthate is 30~50 g / t based on the dry weight of the ore.

[0038] ③ Mix aqueous solution A and aqueous solution B evenly through a rotating mixing funnel-shaped device (the device is the same as the one in patent 201110215878.3 "Preparation and Addition Method of Sulphite in Copper and Lead-Zinc Separation Process"). Add the mixture to the slurry, with the solute mass ratio of zinc oxide collector to butyl xanthate aqueous solution being 3:1 to 4:1. At the same time, add a gangue inhibitor aqueous solution with a weight percentage concentration of 5% to 10%, and the gangue inhibitor dosage is 1200 to 1800 g / t based on the dry weight of the ore.

[0039] Application of a flotation agent for high-mud, high-oxidation-rate, low-grade zinc oxide ore: When performing a primary cleaning operation on high-mud, high-oxidation-rate, low-grade zinc oxide ore, the gangue inhibitor in this flotation agent is added at a rate of 300-500 g / t based on the dry weight of the zinc oxide ore to the zinc rough concentrate slurry.

[0040] Application of a flotation agent for high-mud, high-oxidation-rate, low-grade zinc oxide ore: When performing a single scavenging operation on high-mud, high-oxidation-rate, low-grade zinc oxide ore, the zinc oxide collector in this flotation agent is added at a rate of 20-30 g / t based on the dry weight of the zinc oxide ore in the roughing tailings slurry.

[0041] The zinc content in the raw ore of the above-mentioned high-mud, high-oxidation-rate, low-grade zinc oxide ore is 3.0~6.0%, the zinc oxidation rate is ≥85%, and the mud content of the primary mud is not less than 25% of the mud with a particle size of less than 20μm.

[0042] Example 1:

[0043] A high-oxidation-rate, low-grade zinc oxide ore from Huili County, Sichuan Province, contains approximately 5.0% zinc. The zinc minerals are primarily smithsonite, followed by sphalerite and hemimorphite, with a zinc oxidation rate exceeding 85%. The primary slime contains 25% slime particles smaller than 20 μm. The main gangue minerals are quartz, calcite, dolomite, and talc. The ore sample has high CaO and MgO content, with CaO at 22.13% and MgO at 16.28%, classifying it as a high-calcium, high-magnesium, high-oxidation-rate zinc oxide ore. The closed-circuit test results of Example 1 are shown in Table 3.

[0044] The specific process is as follows:

[0045] (1) Grinding:

[0046] The crushed ore and water are added to a ball mill in a 6:5 ratio for grinding until the fineness of the ground product is -74μm, accounting for 85%.

[0047] (2) Desliming:

[0048] The grinding slurry was deslimed by washing and separating the 0-10μm fine mud to obtain mud-containing slurry and deslimed tailings slurry for subsequent zinc oxide flotation.

[0049] (3) Mixing the paste:

[0050] Add clean water (a) to the desliming tailings to adjust the slurry concentration to 35%.

[0051] (4) Coarse selection of zinc oxide:

[0052] In the tailings slurry after desliming, based on the dry weight of the original ore, 1200 g / t of sodium carbonate (b), 5000 g / t of sodium sulfide (c), 1500 g / t of gangue inhibitor (d), 110 g / t of zinc oxide collector (e), and 35 g / t of butyl xanthate (f) were added for zinc roughing to obtain zinc rough concentrate slurry and roughing tailings slurry, respectively.

[0053] (5) Selected Zinc Oxide:

[0054] Zinc rough concentrate slurry undergoes three cleaning processes to obtain zinc oxide concentrate. The specific process is as follows:

[0055] Based on the dry weight of zinc oxide ore, sodium sulfide (c) 900 g / t and gangue inhibitor (d) 500 g / t are added to the zinc rough concentrate slurry for a first flotation operation, yielding a first concentrate slurry and a first middlings ore. The first middlings ore is returned to step (4) zinc roughing. The first concentrate slurry is then subjected to a second flotation operation without any reagents, yielding zinc concentrate and a second middlings ore. The second middlings ore is returned to step (5) first cleaning operation. The second concentrate slurry is then subjected to a third flotation operation without any reagents, yielding zinc concentrate and a third middlings ore. The third middlings ore is returned to step (5) second cleaning operation.

[0056] (6) Zinc oxide scavenging:

[0057] The roughing tailings slurry undergoes two zinc oxide scavenging operations to obtain zinc oxide scavenged tailings. The specific process is as follows:

[0058] Based on the dry weight of zinc oxide ore, 1000 g / t of sodium sulfide (c), 20 g / t of zinc oxide collector (e), and 10 g / t of butyl xanthate (f) are added to the roughing tailings slurry for a first zinc scavenging operation, yielding a first zinc scavenging tailings slurry and a first scavenging ore concentrate. This first scavenging ore concentrate enters step (4) zinc roughing. 800 g / t of sodium sulfide (c) is added to the first zinc scavenging tailings slurry for a second zinc scavenging operation, yielding zinc scavenging tailings and a second zinc scavenging ore concentrate. The second zinc scavenging ore concentrate is returned to the first zinc scavenging operation.

[0059] Among them, the gangue inhibitor is made of carboxymethyl cellulose, tetrasodium pyrophosphate, larch tannin, and calcium lignin sulfonate in a weight ratio (g / g) of 0.6:4:2:1.

[0060] The zinc oxide collector is composed of dodecylamine acetate (58 parts), n-octanol (15 parts), octyl hydroxamic acid (11 parts), and 2-hydroxybenzaldehyde oxime (16 parts). For laboratory use, the collector can be prepared as a 1-2% aqueous solution first, then mixed thoroughly with the butyl xanthate aqueous solution in a beaker according to the specified addition amount before addition. For on-site production use, the zinc oxide collector (prepared with warm or hot water to a 1-2% aqueous solution) and butyl xanthate can be prepared separately as aqueous solutions, mixed thoroughly using a funnel-shaped device with a solute mass ratio (g / g) of 3:1-4:1, before being added to the slurry.

[0061] Example 2:

[0062] A zinc oxide ore from Yunnan Province contains 4.26% zinc, with an oxidation rate of 87.6%. The primary slime contains 28% slime particles smaller than 20 μm. The main metallic minerals in this sample are smithsonite, sphalerite, hemimorphite, zeolite, cerussite, and vanadium, while the gangue minerals are primarily calcite, dolomite, and talc, followed by quartz. The closed-circuit test results of Example 2 are shown in Table 3.

[0063] The specific process is as follows:

[0064] (1) Grinding:

[0065] The crushed ore and water were added to a ball mill in a 6:5 ratio for grinding until the fineness of the ground product was -74μm, accounting for 88%.

[0066] (2) Desliming:

[0067] The grinding slurry was deslimed by washing and separating the 0-15μm fine mud to obtain mud-containing slurry and deslimed tailings slurry for subsequent zinc oxide flotation.

[0068] (3) Mixing the paste:

[0069] Add clean water (a) to the desliming tailings to adjust the slurry concentration to about 33%.

[0070] (4) Coarse selection of zinc oxide:

[0071] In the tailings slurry after desliming, based on the dry weight of the original ore, 1500 g / t of sodium carbonate (b), 5000 g / t of sodium sulfide (c), 1800 g / t of gangue inhibitor (d), 100 g / t of zinc oxide collector (e), and 40 g / t of butyl xanthate (f) were added for zinc roughing to obtain zinc rough concentrate slurry and roughing tailings slurry, respectively.

[0072] (5) Selected Zinc Oxide:

[0073] Zinc rough concentrate slurry undergoes three cleaning processes to obtain zinc oxide concentrate. The specific process is as follows:

[0074] Based on the dry weight of zinc oxide ore, sodium sulfide (c) 1000 g / t and gangue inhibitor (d) 600 g / t are added to the zinc rough concentrate slurry for a first flotation operation, yielding a first concentrate slurry and a first middlings ore. The first middlings ore is returned to step (4) zinc roughing. The first concentrate slurry is then subjected to a second flotation operation without any reagents, yielding zinc concentrate and a second middlings ore. The second middlings ore is returned to step (5) first cleaning operation. The second concentrate slurry is then subjected to a third flotation operation without any reagents, yielding zinc concentrate and a third middlings ore. The third middlings ore is returned to step (5) second cleaning operation.

[0075] (6) Zinc oxide scavenging:

[0076] The roughing tailings slurry undergoes two zinc oxide scavenging operations to obtain zinc oxide scavenged tailings. The specific process is as follows:

[0077] Based on the dry weight of zinc oxide ore, 1200 g / t of sodium sulfide (c), 30 g / t of zinc oxide collector (e), and 15 g / t of butyl xanthate (f) are added to the roughing tailings slurry for a first zinc scavenging operation, yielding a first zinc scavenging tailings slurry and a first scavenging ore concentrate. This first scavenging ore concentrate enters step (4) zinc roughing. 900 g / t of sodium sulfide (c) is added to the first zinc scavenging tailings slurry for a second zinc scavenging operation, yielding zinc scavenging tailings and a second zinc scavenging ore concentrate. The second zinc scavenging ore concentrate is returned to the first zinc scavenging operation.

[0078] Among them, the gangue inhibitor is made of carboxymethyl cellulose, tetrasodium pyrophosphate, larch tannin, and calcium lignosulfonate in a weight ratio (g / g) of 0.8:4:2:1.

[0079] The zinc oxide collector is composed of dodecylamine acetate (55 parts), n-octanol (15 parts), octyl hydroxamic acid (13 parts), and 2-hydroxybenzaldehyde oxime (17 parts). For laboratory use, the collector can be prepared as a 1-2% aqueous solution first, then mixed thoroughly with the butyl xanthate aqueous solution in a beaker according to the specified addition amount before addition. For on-site production use, the zinc oxide collector (prepared with warm or hot water to a 1-2% aqueous solution) and butyl xanthate can be prepared separately as aqueous solutions, mixed thoroughly using a funnel-shaped device with a solute mass ratio (g / g) of 3:1-4:1, before being added to the slurry.

[0080] Comparative Example 1:

[0081] After desliming and panning of the zinc oxide ore of the same grade as in Example 1, zinc roughing was performed on the tailings slurry. Conventional depressants were used in the zinc roughing operation, and the test results were compared with those of the depressant of this invention. In Comparative Example 1, the deslimed tailings slurry was used as feed for zinc flotation; other reagent conditions are as described in Example 1. The test results comparing conventional depressants and the depressant of this invention in the zinc roughing operation of this zinc oxide ore are shown in Table 1.

[0082] Table 1. Comparison of test results between conventional inhibitors and the inhibitor of the present invention in zinc roughing operations.

[0083]

[0084] Table 1 shows that the inhibitor of this invention has a significant inhibitory effect on gangue minerals. At the same time, it effectively solves the problems of poor zinc oxide sulfidation effect caused by ore slime covering and difficulty in adsorbing collectors on the zinc oxide surface. The zinc grade and zinc recovery rate of zinc rough concentrate are significantly higher than those of conventional inhibitors.

[0085] Comparative Example 2:

[0086] Desliming was performed on lead-zinc sulfide flotation tailings of the same grade as in Example 1, producing deslimed slurry and deslimed tailings slurry. Conventional collectors were used for desliming, and the results were compared with those of the desliming collector of this invention. In the comparative example, lead-zinc sulfide flotation tailings were used as the raw ore for desliming flotation; other reagent conditions were the same as in Example 1. The comparative results of tests on the desliming flotation of this lead-zinc sulfide flotation tailings using conventional collectors and the collector of this invention are shown in Table 2.

[0087] Table 2 Comparison of test results of conventional collectors and the collector of the present invention in desliming flotation operations.

[0088]

[0089] Table 2 shows that the selective collection performance of zinc oxide by mixing the zinc oxide collector of the present invention with butyl xanthate is significantly higher than that of adding amine collectors alone, and the zinc recovery rate of zinc concentrate can reach 61.40%. The collection effect of dodecylamine and xanthate is improved, but the flotation index is still lower than that of the zinc oxide collector of the present invention mixed with butyl xanthate.

[0090] Example 1 uses a multi-stage hydrocyclone for desliming, with a slime yield of approximately 10% and a zinc metal loss of approximately 20% in the slime. Example 2 uses a spiral classifier combined with a high-frequency vibrating screen for desliming, with a desliming yield of approximately 15% and a zinc metal loss of approximately 25% in the slime.

[0091] Table 3. Technical Indicators of Closed-Circuit Mineral Processing in This Invention

[0092]

[0093] Table 3 shows that, using the present invention, both Examples 1 and 2 achieved good industrial application technical indicators. To compare with the closed-circuit results of Example 1 of the present invention, the beneficiation technical indicators of the field scheme of Example 1 (using sodium hexametaphosphate + CMC inhibitor combination as slime inhibitor, and dodecylamine + xanthate as collector) are listed.

Claims

1. A high clay high oxidation rate low grade zinc oxide ore flotation agent, characterized by: The flotation agent is used for the flotation of high-mud high-oxidation rate low-grade zinc oxide ore, which is composed of gangue inhibitor and zinc oxide collector; the gangue inhibitor is uniformly mixed by carboxymethyl cellulose, tetrasodium pyrophosphate, larch tannin, calcium lignosulfonate according to the weight ratio of 0.5-0.8:4:2:1; the zinc content of the raw ore of the high-mud high-oxidation rate low-grade zinc oxide ore is 3.0-6.0%, the zinc oxidation rate is ≥85%, and the content of the ore slime with particle size less than 20μm in the primary slime is not less than 25%; the zinc oxide collector is made of dodecylamine acetate, n-octanol, 2-hydroxybenzaldehyde oxime and octylhydroxamic acid; the zinc oxide collector is prepared by the following method: (1) according to the weight parts, dodecylamine acetate 50-60 parts, n-octanol 10-15 parts, octylhydroxamic acid 10-15 parts, 2-hydroxybenzaldehyde oxime 10-20 parts; (2) in the stirred tank, first add the dodecylamine acetate under normal pressure and heat to 60-70℃, then add the n-octanol, the octylhydroxamic acid and the 2-hydroxybenzaldehyde oxime in sequence after the dodecylamine acetate changes from solid to liquid, and stir and mix for 1-1.5 hours to form a homogeneous oily solution; (3) after the homogeneous oily solution is cooled to room temperature, a viscous solid is formed, and it is obtained.

2. The use of a high clay high oxidation rate low grade zinc oxide ore flotation agent according to claim 1, characterized in that: The flotation agent is used for the flotation of high-mud high-oxidation rate low-grade zinc oxide ore, which is composed of gangue inhibitor and zinc oxide collector; the gangue inhibitor is uniformly mixed by carboxymethyl cellulose, tetrasodium pyrophosphate, larch tannin, calcium lignosulfonate according to the weight ratio of 0.5-0.8:4:2:1; the zinc content of the raw ore of the high-mud high-oxidation rate low-grade zinc oxide ore is 3.0-6.0%, the zinc oxidation rate is ≥85%, and the content of the ore slime with particle size less than 20μm in the primary slime is not less than 25%; the zinc oxide collector is made of dodecylamine acetate, n-octanol, 2-hydroxybenzaldehyde oxime and octylhydroxamic acid; the zinc oxide collector is prepared by the following method: ① The zinc oxide collector is prepared into an aqueous solution A with a concentration of 1-2% by using warm water or hot water; the dosage of the zinc oxide collector is 80-120g / t based on the dry ore weight of the ore; ② Butyl xanthate is prepared into an aqueous solution B by using warm water or hot water; the dosage of the butyl xanthate is 30-50g / t based on the dry ore weight of the ore; ③ The aqueous solution A and the aqueous solution B are mixed uniformly and then added to the ore slurry, and the solute mass ratio of the zinc oxide collector to the butyl xanthate aqueous solution is 3:1-4:1; at the same time, an aqueous solution of the gangue inhibitor with a concentration of 5%-10% by weight is added, and the dosage of the gangue inhibitor is 1200-1800g / t based on the dry ore weight of the ore.

3. The use of a high clay high oxidation rate low grade zinc oxide ore flotation agent according to claim 2, characterized in that: The gangue inhibitor in the flotation agent is added to the zinc rough concentrate slurry at a dosage of 300-500g / t based on the dry ore weight of the zinc oxide ore when the one-time cleaning operation of the high-mud high-oxidation rate low-grade zinc oxide ore is carried out.

4. The use of a high clay high oxidation rate low grade zinc oxide ore flotation agent according to claim 2, characterized in that: The zinc oxide collector in the flotation agent is added to the roughing tailings slurry at a dosage of 20-30g / t based on the dry ore weight of the zinc oxide ore when the one-time scavenging operation of the high-mud high-oxidation rate low-grade zinc oxide ore is carried out.

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