Agent for flotation separation of scheelite

Abstract

The invention provides a reagent for flotation separation of scheelite, and belongs to the technical field of mineral separation. The scheelite flotation separation reagent comprises a scheelite collecting agent and a gangue mineral inhibitor. The scheelite collecting agent comprises the following components in parts by mass: 60 to 85 parts of alkyl substituted sodium succinate, 10 to 30 parts of alkyl substituted butanediamine and 5 to 10 parts of alpha-benzoin oxime. The gangue mineral inhibitor is prepared from the following components in parts by mass: 40 to 60 parts of [NH4] 2SiF6, 30 to 50 parts of azo medicament and 10 to 30 parts of disodium 1-nitroso-2-naphthol-3, 6-disulfonate. According to the method, efficient recovery of tungsten resources in scheelite is achieved through the synergistic effect between the scheelite collecting agent and the gangue mineral inhibitor, the grade of WO3 exceeds 65%, and the recovery rate reaches 85% or above.

Description

Technical Field

[0001] The invention relates to the technical field of ore dressing, in particular to a reagent for flotation separation of scheelite. Background Art

[0002] Tungsten and its alloys are one of the most important functional materials in modern industry, national defense and high-tech applications. They are widely used in aerospace, atomic energy, shipbuilding, automobile industry, electrical industry, electronics industry, chemical industry and many other fields. The main tungsten ores with industrial application value in nature are wolframite and scheelite. Wolframite has a high specific gravity and is magnetic. Conventional gravity separation and magnetic separation processes can obtain satisfactory indicators. Therefore, wolframite has been developed and utilized on a large scale for many years. However, with long-term and high-intensity development, wolframite resources are almost exhausted. Therefore, the technology and process of efficiently recovering tungsten resources from scheelite has received increasing attention from mineral processing workers.

[0003] Scheelite (CaWO4) has a fine particle size and is often associated with calcium-containing resources such as fluorite, dolomite, and calcite. Similar surface active sites make it difficult to separate scheelite from gangue minerals, which makes it difficult to reduce the impurity content in scheelite concentrate and make it impossible to obtain qualified products, or it requires very high costs or very complicated operating procedures to obtain qualified products. For example, the "Petrov method" commonly used to separate scheelite from fluorite and calcite is to concentrate the scheelite crude concentrate containing calcite and fluorite to a concentration of 60% to 70%, then add water glass, heat the slurry to 80°C, stir for 30 to 60 minutes, and then dilute with water. The scheelite is floated at room temperature, and the products in the tank are fluorite and calcite. This method is complex and energy-intensive. In recent years, people have also found that metal-organic ligands can play an unexpected role in tungsten ore flotation. For example, Pb-benzohydroxamic acid complexes can significantly increase the grade of tungsten concentrate, but the tungsten recovery rate is not high and the method is costly, which is difficult for most concentrators to afford. Summary of the invention

[0004] Based on the above content, the purpose of the present invention is to provide a reagent for flotation separation of scheelite.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] One of the technical solutions of the present invention is a reagent for flotation separation of scheelite, comprising a scheelite collector and a gangue mineral inhibitor;

[0007] The scheelite collector comprises the following components in parts by weight: 60-85 parts of alkyl-substituted sodium succinate, 10-30 parts of alkyl-substituted butanediamine and 5-10 parts of α-benzoin oxime;

[0008] The gangue mineral inhibitor comprises the following components in parts by mass: 40-60 parts of [NH4]2SiF6, 30-50 parts of azo reagents and 10-30 parts of disodium 1-nitroso-2-naphthol-3,6-disulfonate.

[0009] The second technical solution of the present invention is a flotation separation method of scheelite, wherein the scheelite is mixed with the azo reagent described in the above technical solution and then ground to obtain a grinding product, and then the grinding product is prepared into a pulp I and then flotated;

[0010] The flotation is carried out using the [NH4]2SiF6, 1-nitroso-2-naphthol-3,6-disulfonic acid disodium and scheelite collector described in the above technical solution.

[0011] The present invention discloses the following technical effects:

[0012] The gangue mineral inhibitor in the present invention has a good inhibitory effect on calcium magnesium carbonate minerals such as dolomite and calcite, fluorite minerals, etc.; the scheelite collector can greatly improve the selectivity and collection capacity of scheelite; in addition, the gangue mineral inhibitor NH4 + The created ammonia atmosphere is conducive to the adsorption of α-benzoin oxime in the scheelite collector on the surface of scheelite. The present invention realizes the efficient recovery of tungsten resources in scheelite through the synergistic effect between the gangue mineral inhibitor and the scheelite collector, the grade of WO3 exceeds 65%, and the recovery rate reaches more than 85%.

[0013] The scheelite flotation separation method provided by the invention is simple, the reagent system has high selectivity, and can realize efficient separation of scheelite and gangue minerals under normal temperature conditions, has low energy consumption, high tungsten concentrate grade and recovery rate, and is suitable for industrial production. DETAILED DESCRIPTION

[0014] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as limiting the present invention, but should be understood as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0015] It should be understood that the terms described in the present invention are only for describing a particular embodiment and are not intended to limit the present invention. In addition, for the numerical range in the present invention, it should be understood that each intermediate value between the upper and lower limits of the scope is also specifically disclosed. The intermediate value in any stated value or stated range, and each smaller range between any other stated value or intermediate value in the described range is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded in the scope.

[0016] Unless otherwise indicated, all technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art. Although the present invention describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials associated with the documents. In the event of a conflict with any incorporated document, the content of this specification shall prevail.

[0017] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments of the present invention description without departing from the scope or spirit of the present invention. Other embodiments derived from the present invention description will be apparent to those skilled in the art. The present invention description and examples are exemplary only.

[0018] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0019] One of the technical solutions of the present invention is a reagent for flotation separation of scheelite, comprising a scheelite collector and a gangue mineral inhibitor;

[0020] The scheelite collector comprises the following components in parts by weight: 60-85 parts of alkyl-substituted sodium succinate, 10-30 parts of alkyl-substituted butanediamine and 5-10 parts of α-benzoin oxime;

[0021] The gangue mineral inhibitor comprises the following components in parts by mass: 40-60 parts of [NH4]2SiF6, 30-50 parts of azo reagents and 10-30 parts of disodium 1-nitroso-2-naphthol-3,6-disulfonate.

[0022] In some embodiments of the present invention, the reagent for flotation separation of scheelite is composed of a scheelite collector and a gangue mineral inhibitor;

[0023] The scheelite collector is composed of the following components in parts by mass: 60-85 parts of alkyl-substituted sodium succinate, 10-30 parts of alkyl-substituted butanediamine and 5-10 parts of α-benzoin oxime;

[0024] The gangue mineral inhibitor is composed of the following components in parts by mass: 40-60 parts of [NH4]2SiF6, 30-50 parts of azo reagents and 10-30 parts of 1-nitroso-2-naphthol-3,6-disulfonic acid disodium.

[0025] In some embodiments of the present invention, the structural formula of the alkyl-substituted sodium succinate is Where R1 is C 12 -C 20A saturated or unsaturated alkyl group, R2 is -SO3H, -OH, -Cl or -Br; preferably, the alkyl-substituted sodium succinate is sodium lauryl sulfosuccinate, with the structural formula

[0026] In some embodiments of the present invention, the structural formula of the α-benzoin oxime is

[0027] In some embodiments of the present invention, the structural formula of the alkyl-substituted butanediamine is Where R3 is C 10 -C 14 A saturated or unsaturated alkyl group; preferably, the alkyl-substituted butanediamine is N-dodecyl-1,4-butanediamine.

[0028] In some embodiments of the present invention, the azo agent is one or more of azoarsine I, azoarsine III, chlorophosphonazo I, chlorophosphonazo III, 4-(2-pyridyl azo)-resorcinol and p-nitrophenylazo-1-naphthol; preferably, the azo agent is p-nitrophenylazo-1-naphthol, with the structural formula

[0029] The second technical solution of the present invention is a flotation separation method of scheelite, wherein the scheelite is mixed with the azo reagent described in the above technical solution and then ground to obtain a grinding product, and then the grinding product is prepared into a pulp I and then flotated;

[0030] The flotation is carried out using the [NH4]2SiF6, 1-nitroso-2-naphthol-3,6-disulfonic acid disodium and scheelite collector described in the above technical solution.

[0031] In some embodiments of the present invention, the flotation is specifically:

[0032] Step 1. Adding [NH4]2SiF6, 1-nitroso-2-naphthol-3,6-disulfonic acid disodium and scheelite collector described in the above technical solution to the slurry I for the first flotation to obtain the first concentrate and the first tailings;

[0033] Step 2. After the first concentrate is prepared into pulp II, the flotation process in step 1 is repeated; after a total of n flotations, scheelite concentrate and nth tailings are obtained;

[0034] Said 5≤n≤7.

[0035] In some embodiments of the present invention, the slurry I is obtained by uniformly mixing the grinding product and water in a mass ratio of (30-40): (60-70).

[0036] In some embodiments of the present invention, before adding the scheelite collector to the ore slurry I, the step of dissolving the scheelite collector in a [NH4]2CO3 solution with a mass concentration of 2% is also included.

[0037] In some embodiments of the present invention, in the grinding and the first flotation, the total amount of the azo reagent, [NH4]2SiF6 and 1-nitroso-2-naphthol-3,6-disulfonic acid disodium is 800g / t of scheelite ore; the mass ratio of the [NH4]2SiF6, the azo reagent and 1-nitroso-2-naphthol-3,6-disulfonic acid disodium is (40-60): (30-50): (10-30);

[0038] In the second flotation to the nth flotation, the total amount of [NH4]2SiF6 and 1-nitroso-2-naphthol-3,6-disulfonic acid disodium used in each flotation is 100-600g / t of scheelite ore, and the mass ratio of [NH4]2SiF6 and 1-nitroso-2-naphthol-3,6-disulfonic acid disodium is (40-60):(10-30);

[0039] In the first flotation to the nth flotation, the amount of scheelite collector used in each flotation is 600-1200 g / t scheelite ore.

[0040] In the present invention, as the number of flotation times increases, the dosage of gangue mineral inhibitors (azo agents, [NH4]2SiF6 and 1-nitroso-2 naphthol-3,6-disulfonic acid disodium) and scheelite collectors gradually decreases. For example, when the number of flotation times is 6 times, the dosage of gangue mineral inhibitors (azo agents, [NH4]2SiF6 and 1-nitroso-2 naphthol-3,6-disulfonic acid disodium) used in ball milling + the first flotation is 800g / t of scheelite ore; the total dosage of [NH4]2SiF6 and 1-nitroso-2 naphthol-3,6-disulfonic acid disodium in the second, third, fourth, fifth and sixth flotations is 600g / t of scheelite ore, 400g / t of scheelite ore, 200g / t of scheelite ore, 100g / t of scheelite ore, and 100g / t of scheelite ore, respectively.

[0041] In some embodiments of the present invention, after the first flotation is completed, the first tailings are further subjected to scavenging; the scavenging is carried out using [NH4]2SiF6 and 1-nitroso-2-naphthol-3,6-disulfonic acid disodium as described in the above technical solution. The present invention reuses the tailings through the scavenging step, thereby reducing the waste of WO3 resources in scheelite.

[0042] In some embodiments of the present invention, the scanning is specifically:

[0043] S1. After the first tailings are prepared into slurry A, [NH4]2SiF6 and 1-nitroso-2-naphthol-3,6-disulfonic acid disodium are added and the first scavenging is performed to obtain a first scavenging concentrate and a first scavenging tailings;

[0044] S2. After the first scavenging tailings are prepared into slurry B, the scavenging process of step S1 is repeated for a total of m scavenging times to obtain the mth scavenging concentrate and the final tailings;

[0045] The mth scavenged concentrate is returned to the m-1th scavenging, the first scavenged concentrate is returned to the first flotation; the nth tailings are returned to the n-1th flotation;

[0046] Said 5≤n≤7, 2≤m≤4.

[0047] In some embodiments of the present invention, the slurry A is obtained by uniformly mixing the first tailings and water in a mass ratio of (40-50): (50-60); the slurry B is obtained by uniformly mixing the first scavenged tailings and water in a mass ratio of (40-50): (50-60).

[0048] In some embodiments of the present invention, in the first to mth sweeps, the total amount of [NH4]2SiF6 and 1-nitroso-2 naphthol-3,6-disulfonic acid disodium used in each sweep is 800-1000g / t of scheelite ore, and the mass ratio of [NH4]2SiF6 and 1-nitroso-2 naphthol-3,6-disulfonic acid disodium is (40-60): (10-30). In the present invention, as the number of sweeps increases, the total amount of [NH4]2SiF6 and 1-nitroso-2 naphthol-3,6-disulfonic acid disodium used gradually decreases. For example, when the number of sweeps is 2 times, the total amount of [NH4]2SiF6 and 1-nitroso-2 naphthol-3,6-disulfonic acid disodium used in the first and second sweeps is 1000g / t of scheelite ore and 800g / t of scheelite ore, respectively.

[0049] The working principle of the reagent for flotation separation of scheelite in the present invention is as follows:

[0050] The -N=N-, -OH, and -NO2 in the azo reagent of the present invention are easy to react with the Ca on the surface of the carbonate. 2+ Mg 2+ The ions react chemically, which results in this type of agent having a good inhibitory effect on calcium magnesium carbonate minerals such as dolomite and calcite. Because azo agents are difficult to dissolve in water, they are added to the ball mill to grind together with the minerals to increase the duration and intensity of the action between the agent and the mineral. After [NH4]2SiF6 is added to the slurry, SiF6 2+ Can dissociate into F in aqueous solution - and SiO3 2-, where F - It can be used as an inhibitor of fluorite minerals, and SiO3 2- It can be used as a dispersant and inhibitor for fine-grained sludge. More importantly, NH4 + The ammonia atmosphere created is conducive to the adsorption of the collector α-benzoin oxime on the surface of scheelite. Disodium 1-nitroso-2-naphthol-3,6-disulfonate can react with Ca on the surface of fluorite. 2+ and Ba on the surface of barite minerals 2+ It combines and adsorbs on the surface of fluorite and barite minerals, enhancing the hydrophilicity of the gangue minerals.

[0051] The scheelite collector composition provided by the present invention comprises alkyl-substituted sodium succinate, alkyl-substituted butanediamine and α-benzoin oxime. Alkyl-substituted sodium succinate can be -SO3 - and -COO - The chelate ring is formed and adsorbed on the surface of scheelite, which greatly improves the selectivity and collection capacity of the collector for scheelite. The two amine groups in the alkyl-substituted diamine can be selectively adsorbed on the surface of scheelite, and have good selectivity for the separation of scheelite from calcium and magnesium carbonate gangue minerals. In addition, in the development process of the traditional collector system for scheelite, the mineral processing workers often pay attention to the effect of the reagent and the calcium ions on the surface of scheelite, but the interaction between the collector and the tungsten ions is often not taken seriously enough. The α-benzoin oxime in the collector combination provided by the present invention can react chemically with the tungsten element on the surface of scheelite in an ammonia atmosphere, thereby greatly increasing the selectivity and collection capacity of the collector combination for scheelite. However, the non-polar group of α-benzoin oxime is relatively short, so the scheelite can only be effectively floated with the help of stable bubbles formed in the pulp by alkyl-substituted sodium succinate and alkyl-substituted diamine. The synergistic effect of the three reagents can play a good synergistic collection role on scheelite.

[0052] In order to better understand the present invention, the content of the present invention is further explained below in conjunction with the embodiments, but the content of the present invention is not limited to the following embodiments.

[0053] Example 1

[0054] In terms of weight, the scheelite collector is: sodium lauryl sulfosuccinate (80 parts), N-dodecyl-1,4-butanediamine (15 parts) and α-benzoin oxime (5 parts); the gangue mineral inhibitor is: [NH4]2SiF6 (60 parts), p-nitrophenylazo-1-naphthol (10 parts) and disodium 1-nitroso-2-naphthol-3,6-disulfonate (30 parts).

[0055] Example 2

[0056] In terms of weight, the scheelite collector is: sodium lauryl sulfosuccinate (75 parts), N-dodecyl-1,4-butanediamine (22 parts) and α-benzoin oxime (3 parts); the gangue mineral inhibitor is: [NH4]2SiF6 (55 parts), p-nitrophenylazo-1-naphthol (25 parts) and disodium 1-nitroso-2-naphthol-3,6-disulfonate (20 parts).

[0057] Example 3

[0058] In terms of weight, the scheelite collector is: sodium lauryl sulfosuccinate (70 parts), N-dodecyl-1,4-butanediamine (25 parts) and α-benzoin oxime (5 parts); the gangue mineral inhibitor is: [NH4]2SiF6 (50 parts), p-nitrophenylazo-1-naphthol (35 parts) and disodium 1-nitroso-2-naphthol-3,6-disulfonate (15 parts).

[0059] Example 4

[0060] In terms of weight, the scheelite collector is: sodium lauryl sulfosuccinate (80 parts), N-dodecyl-1,4-butanediamine (18 parts) and α-benzoin oxime (2 parts); the gangue mineral inhibitor is: [NH4]2SiF6 (60 parts), p-nitrophenylazo-1-naphthol (20 parts) and disodium 1-nitroso-2-naphthol-3,6-disulfonate (20 parts).

[0061] Example 5

[0062] In terms of weight, the scheelite collector is: sodium lauryl sulfosuccinate (65 parts), N-dodecyl-1,4-butanediamine (30 parts) and α-benzoin oxime (5 parts); the gangue mineral inhibitor is: [NH4]2SiF6 (60 parts), p-nitrophenylazo-1-naphthol (30 parts) and disodium 1-nitroso-2-naphthol-3,6-disulfonate (10 parts).

[0063] The samples processed in Examples 1 to 5 of the present invention are fine-grained scheelite gravity separation fine mud in Shangluo, Shaanxi. The flotation temperature is 23±2°C. The gangue minerals are mainly fluorite, calcite, dolomite, barite, quartz, etc., and a positive flotation closed-circuit process is adopted. The specific operation process is:

[0064] The fine-grained scheelite gravity separation fine mud is ground to a content of -0.045 of more than 75%, and p-nitrophenylazo-1-naphthol is added during the grinding process. The obtained grinding product is prepared into a pulp with a mass concentration of 35%, and then [NH4]2SiF6, 1-nitroso-2-naphthol-3,6-disulfonic acid disodium, and scheelite collector are added in sequence (the three components of the scheelite collector are mixed according to the proportions of the embodiment and dissolved in a [NH4]2CO3 solution with a mass concentration of 2%, and then added. The addition method of the scheelite collector in the following process is the same) to perform the first flotation to obtain the first concentrate and the first tailings; the first concentrate is prepared into a pulp with a mass concentration of 35%, and then [NH4]2SiF6, 1-nitroso-2-naphthol-3,6-disulfonic acid disodium, and a scheelite collector are added in sequence. After preparing a slurry with a mass concentration of 25%, [NH4]2SiF6, 1-nitroso-2-naphthol-3,6-disulfonic acid disodium, and scheelite collector are sequentially added to carry out a second flotation to obtain a second concentrate and a second tailing; after preparing the second concentrate into a slurry with a mass concentration of 20%, [NH4]2SiF6, 1-nitroso-2-naphthol-3,6-disulfonic acid disodium, and scheelite collector are sequentially added to carry out a third flotation to obtain a third concentrate and a third tailing; after preparing the third concentrate into a slurry with a mass concentration of 20%, [NH4]2SiF6, 1-nitroso-2-naphthol-3,6-disulfonic acid disodium, and scheelite collector are sequentially added to carry out a third flotation to obtain a third concentrate and a third tailing; The fourth concentrate and the fourth tailings are flotated for the fourth time with the addition of [NH4]2SiF6, 1-nitroso-2-naphthol-3,6-disulfonic acid disodium, and scheelite collector; the fourth concentrate is prepared into a slurry with a mass concentration of 20%, and then [NH4]2SiF6, 1-nitroso-2-naphthol-3,6-disulfonic acid disodium, and scheelite collector are added in sequence for the fifth flotation to obtain the fifth concentrate and the fifth tailings; the fifth concentrate is prepared into a slurry with a mass concentration of 20%, and then [NH4]2SiF6, 1-nitroso-2-naphthol-3,6-disulfonic acid disodium, and scheelite collector are added in sequence for the sixth flotation to obtain the scheelite concentrate and the sixth tailings; the first tailings are prepared into a slurry with a mass concentration of 40%, and then [NH4]2SiF6 is added in sequence , 1-nitroso-2-naphthol-3,6-disulfonic acid disodium, and then perform the first scavenging to obtain the first scavenging concentrate and the first scavenging tailings; the first scavenging tailings are prepared into a slurry with a mass concentration of 45%, and then [NH4]2SiF6 and 1-nitroso-2-naphthol-3,6-disulfonic acid disodium are added in sequence, and then a second scavenging is performed to obtain the second scavenging concentrate and the final tailings; the second scavenging concentrate is returned to the first scavenging, and the first scavenging concentrate is returned to the first flotation; the second tailings are returned to the first flotation, the third tailings are returned to the second flotation, the fourth tailings are returned to the third flotation, the fifth tailings are returned to the fourth flotation, and the sixth tailings are returned to the fifth flotation.

[0065] In the grinding process + the first flotation, the amount of gangue mineral inhibitor (the mass ratio of [NH4]2SiF6, p-nitrophenylazo-1-naphthol and 1-nitroso-2-naphthol-3,6-disulfonic acid disodium is consistent with that in the embodiment) is 800 g / t of raw ore; in the second, third, fourth, fifth and sixth flotations, the total amount of [NH4]2SiF6 and 1-nitroso-2-naphthol-3,6-disulfonic acid disodium (the dosage ratio of the two agents is consistent with that in the embodiment) is 600 g / t of raw ore, 400 g / t of raw ore, 200 g / t of raw ore, 100 g / t of raw ore and 100 g / t of raw ore respectively.

[0066] The dosages of the first, second, third, fourth, fifth and sixth flotation scheelite collectors (the mass ratios of the components in the scheelite collectors are consistent with those in the embodiment) are 1200 g / t of raw ore, 1000 g / t of raw ore, 800 g / t of raw ore, 600 g / t of raw ore and 600 g / t of raw ore, respectively.

[0067] The total amount of [NH4]2SiF6 and disodium 1-nitroso-2-naphthol-3,6-disulfonate (the dosage ratio of the two agents is consistent with that in the embodiment) used in the first and second sweeps is 1000g / t of raw ore and 800g / t of raw ore, respectively.

[0068] Table 1 shows the grade and recovery rate of WO3 in scheelite concentrate obtained after closed-circuit flotation tests using the reagents of Examples 1 to 5 of the present invention. The data in Table 1 show that after one roughing, five cleanings and two scavengings of fine-grained scheelite gravity separation fine mud using the method of the present invention, a scheelite concentrate with a WO3 grade of 67.68% to 68.62% and a recovery rate of 87.68% to 88.52% can be obtained, wherein the grade of CaF2 is 1.02% to 1.11%, the grade of CaCO3 is 0.87% to 0.91%, the grade of Fe2O3 is 1.05% to 1.21%, the grade of BaSO4 is 0.79% to 0.88%, and the grade of SiO2 is 1.15% to 1.25%.

[0069] Table 1 Grade and recovery of CaWO4 in scheelite concentrate

[0070]

[0071] When the alkyl-substituted sodium succinate is octadec-9-enyl sodium sulfosuccinate, the alkyl-substituted butanediamine is N-hexadecyl-1,4-butanediamine, and the azo reagent is azoarsine I, azoarsine III, azochlorophosphine I, azochlorophosphine III or 4-(2-pyridyl azo)-resorcinol, the present invention also conducts experiments on the flotation separation of scheelite. The experimental results show that when other alkyl-substituted sodium succinates, alkyl-substituted butanediamines and azo reagents are selected, the flotation separation effect of scheelite is equivalent to that of Examples 1-5, which will not be repeated here due to space reasons.

[0072] In the absence of conflict, the above embodiments and features in the embodiments may be combined with each other.

[0073] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A reagent for flotation separation of scheelite, characterized in that: Includes scheelite collectors and gangue mineral inhibitors; The scheelite collector comprises the following components in parts by weight: 60-85 parts of alkyl-substituted sodium succinate, 10-30 parts of alkyl-substituted butanediamine and 5-10 parts of α-benzoin oxime; The gangue mineral inhibitor comprises the following components in parts by mass: 40-60 parts of [NH4]2SiF6, 30-50 parts of azo reagents and 10-30 parts of disodium 1-nitroso-2-naphthol-3,6-disulfonate.

2. The reagent for flotation separation of scheelite according to claim 1, characterized in that: The structural formula of the alkyl-substituted sodium succinate is Where R1 is C 12 -C 20 A saturated or unsaturated alkyl group, R2 is -SO3H, -OH, -Cl or -Br; The structural formula of the alkyl-substituted butanediamine is Where R3 is C 10 -C 14 A saturated or unsaturated alkyl group; The azo agent is one or more of azoarsine I, azoarsine III, chlorophosphanazo I, chlorophosphanazo III, 4-(2-pyridyl azo)-resorcinol and p-nitrophenyl azo-1-naphthol.

3. A flotation separation method for scheelite, characterized in that: The scheelite is mixed with the azo agent described in claim 1 and then ground to obtain a grinding product, and the grinding product is then prepared into a pulp I and then flotated; The flotation is carried out using the [NH4]2SiF6, 1-nitroso-2-naphthol-3,6-disulfonic acid disodium and scheelite collector described in claim 1.

4. The flotation separation method of scheelite according to claim 3, characterized in that: The flotation is specifically: Step 1. Adding [NH4]2SiF6, 1-nitroso-2-naphthol-3,6-disulfonic acid disodium and scheelite collector as described in claim 1 to the slurry I for the first flotation to obtain a first concentrate and a first tailings; Step 2. After the first concentrate is prepared into pulp II, the flotation process in step 1 is repeated; after a total of n flotations, scheelite concentrate and nth tailings are obtained; Said 5≤n≤7.

5. The flotation separation method of scheelite according to claim 4, characterized in that: In the grinding and the first flotation, the total amount of the azo reagent, [NH4]2SiF6 and 1-nitroso-2-naphthol-3,6-disulfonic acid disodium is 800g / t of scheelite ore, and the mass ratio of the [NH4]2SiF6, the azo reagent and 1-nitroso-2-naphthol-3,6-disulfonic acid disodium is (40-60):(30-50):(10-30); In the second flotation to the nth flotation, the total amount of [NH4]2SiF6 and 1-nitroso-2-naphthol-3,6-disulfonic acid disodium used in each flotation is 100-600g / t of scheelite ore, and the mass ratio of [NH4]2SiF6 and 1-nitroso-2-naphthol-3,6-disulfonic acid disodium is (40-60):(10-30); In the first flotation to the nth flotation, the amount of scheelite collector used in each flotation is 600-1200 g / t scheelite ore.

6. The flotation separation method of scheelite according to claim 4, characterized in that: After the first flotation is completed, the step of scavenging the first tailings is also included; the scavenging is performed using the [NH4]2SiF6 and 1-nitroso-2-naphthol-3,6-disulfonic acid disodium as described in claim 1.

7. The flotation separation method of scheelite according to claim 6, characterized in that: The scanning is specifically as follows: S1. After the first tailings are prepared into slurry A, [NH4]2SiF6 and 1-nitroso-2-naphthol-3,6-disulfonic acid disodium are added and the first scavenging is performed to obtain a first scavenging concentrate and a first scavenging tailings; S2. After the first scavenging tailings are prepared into slurry B, the scavenging process of step S1 is repeated for a total of m scavenging times to obtain the mth scavenging concentrate and the final tailings; The mth scavenged concentrate is returned to the m-1th scavenging, the first scavenged concentrate is returned to the first flotation; the nth tailings are returned to the n-1th flotation; Said 5≤n≤7, 2≤m≤4.

8. The flotation separation method of scheelite according to claim 7, characterized in that: In the first scanning to the mth scanning, the total amount of [NH4]2SiF6 and 1-nitroso-2-naphthol-3,6-disulfonic acid disodium used in each scanning is 800-1000g / t of scheelite ore, and the mass ratio of [NH4]2SiF6 and 1-nitroso-2-naphthol-3,6-disulfonic acid disodium is (40-60):(10-30).

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