Low molecular weight soluble chelating collectors, their preparation methods and applications

Abstract

This invention provides a low-molecular-weight soluble chelating collector, its preparation method, and its application, belonging to the field of mineral processing technology. The collector uses low-molecular-weight polyethylene terephthalate as a precursor, introduces isosorbide for copolymerization, and introduces glutamic acid as a branched unit, utilizing its multifunctional characteristics to significantly improve the branching degree of the molecular structure and the density of reactive sites. The rigid cyclic structure and ether bonds of isosorbide endow the agent with good water solubility and dispersibility, avoiding ineffective coiling of the polymer chain; the introduction of glutamic acid branches significantly increases the number of hydroxyl and amino groups that can react with carbon disulfide, allowing each molecule to carry more xanthate groups, enhancing the adsorption stability and coverage density of the molecule on the surface of arsenopyrite. This structure fully exposes the xanthate functional groups, facilitating multidentate chelation with iron and arsenic ions on the surface of arsenopyrite, forming a strongly hydrophobic surface layer, thereby significantly improving the collection selectivity.

Description

Technical Field

[0001] This invention relates to the field of mineral processing technology, specifically to a low-molecular-weight soluble chelating collector, its preparation method, and its application. Background Technology

[0002] The flotation separation of arsenic-bearing sulfide minerals (especially arsenopyrite) has always been one of the challenges in the mineral processing field. Arsenopyrite (FeAsS), as a common arsenic-bearing sulfide mineral, often occurs in association with valuable metal minerals (such as chalcopyrite, galena, sphalerite, etc.). Due to its similar surface floatability to some useful sulfide minerals, arsenic can easily enter the concentrate product during conventional flotation, seriously affecting the concentrate quality and subsequent smelting processes.

[0003] Traditional collectors (such as xanthates and black reagents) have poor selectivity for arsenopyrite, often requiring the use of large amounts of lime, cyanide, and other inhibitors. This not only reduces the recovery rate of valuable metals in highly alkaline environments but also causes serious environmental and safety problems. Existing methods for arsenopyrite removal include slurry heating, oxidant methods, combined modifier and organic inhibitor methods, and externally controlled electric field oxidation. The inhibitor method is the most widely used, relying mainly on the inhibitory effect, but its effectiveness is unstable and it easily leads to the loss of valuable metals.

[0004] In view of this, it is of great significance to develop a new agent that can efficiently and selectively capture arsenopyrite and realize the clean utilization of arsenic-containing mineral resources. Summary of the Invention

[0005] In view of the technical problems existing in the background art, the present invention provides a low molecular weight soluble chelating collector, its preparation method and application, aiming to solve the problem of poor selectivity of the collector for arsenopyrite and the decline in the recovery rate of valuable metals.

[0006] This invention provides a low-molecular-weight soluble chelating collector, the molecular structure of which is as follows: .

[0007] This invention also provides a method for preparing a low-molecular-weight soluble chelating collector, comprising the following steps: S1. Under inert gas protection, a low molecular weight polyethylene terephthalate oligomer, isosorbide, and a first catalyst are mixed and reacted at 160-220°C for 2-6 hours to obtain a hydroxyl-terminated PET-ISO copolymer; the number average molecular weight of the low molecular weight polyethylene terephthalate oligomer is 800-1000 g / mol. S2. Dissolve the hydroxyl-terminated PET-ISO copolymer obtained in step S1 in an aprotic solvent, add a condensing agent and a second catalyst, react with glutamic acid at 20-60°C for 6-24 hours, then separate and dry to obtain a glutamic acid-branched polymer. S3. Dissolve the glutamic acid-branched polymer obtained in step S2 in an organic solvent, first add an alkaline solution for alkalization, then add carbon disulfide, react at room temperature for 4-12 hours, and then separate and dry to obtain the low molecular weight soluble chelating collector.

[0008] As a further improvement of the present invention, in step S1, the molar ratio of the low molecular weight polyethylene terephthalate oligomer to isosorbide is 1:(0.8-1.5).

[0009] As a further improvement of the present invention, in step S1, the reaction adopts a programmed temperature increase, first reacting at 170-190℃ for 1-3 hours, and then reacting at 200-220℃ for 2-4 hours.

[0010] As a further improvement of the present invention, in step S1, the first catalyst is one of zinc acetate, manganese acetate or antimony trioxide; the amount of the first catalyst added is 0.1%-1.0% of the total mass of the reactants.

[0011] As a further improvement of the present invention, in step S2, the condensing agent is N,N'-dicyclohexylcarbodiimide or N,N'-diisopropylcarbodiimide; the aprotic solvent is N,N-dimethylformamide or dimethyl sulfoxide; and the second catalyst is 4-dimethylaminopyridine.

[0012] As a further improvement of the present invention, in step S2, the molar ratio of the carboxyl group in the glutamic acid to the terminal hydroxyl group in the hydroxyl-terminated PET-ISO copolymer is (1.0-2.0):1.

[0013] The present invention also provides a method for collecting toxic arsine, comprising the following steps: A1. Mixing minerals containing arsenopyrite with water to form a slurry; A2. Adjust the pH of the pulp to 10-12, add the low molecular weight soluble chelating collector, then add kerosene, followed by the frother MIBC; after 2-5 minutes, introduce air and begin flotation.

[0014] As a further improvement of the present invention, the total amount of low molecular weight soluble chelating collector is 0.05-0.1 kg / t. 矿 .

[0015] As a further improvement of the present invention, during the flotation process, bubbles are skimmed off every 5-10 seconds and water is added every 30-40 seconds.

[0016] The collector molecule obtained by this invention contains both strong complexing groups and moderately hydrophobic segments, which can enhance the recognition and binding ability of active sites on the surface of arsenopyrite, and provide sufficient hydrophobicity to make it firmly adsorbed on the surface of bubbles.

[0017] The collector obtained by this invention uses low molecular weight water-soluble organic matter as the parent material and is designed and synthesized by introducing specific chelating functional groups (such as mercapto, carboxyl, and hydroxyl groups). This allows it to form stable water-soluble chelates with iron, arsenic, and other metal ions on the surface of arsenopyrite under near-weakly alkaline slurry conditions, thereby achieving highly selective flotation collection of arsenopyrite.

[0018] Compared with the prior art, the beneficial effects of the present invention are: The low-molecular-weight soluble chelating collector of this invention uses low-molecular-weight polyethylene terephthalate as a precursor and introduces isosorbide for copolymerization; glutamic acid is introduced as a branched unit, utilizing its multifunctional characteristics to significantly improve the branching degree and reactive site density of the molecular structure. Based on this, the hydroxyl groups at the molecular backbone and branch ends react with carbon disulfide to construct a low-molecular-weight fragment containing multiple xanthate functional groups, achieving a synergistic molecular design of "rigid backbone-flexible branch-multi-site collection".

[0019] The rigid cyclic structure and ether bonds of isosorbide endow the agent with excellent water solubility and dispersibility, avoiding ineffective coiling of the polymer chain. The introduction of glutamic acid branches not only significantly increases the number of hydroxyl and amino groups that can react with carbon disulfide, allowing each molecule to carry more xanthate groups, but also enhances the adsorption stability and coverage density of the molecule on the arsenopyrite surface. This structure fully exposes the xanthate functional groups, facilitating multidentate chelation with iron and arsenic ions on the arsenopyrite surface to form a strongly hydrophobic surface layer, thereby significantly improving harvesting selectivity.

[0020] Compared with traditional arsenic collectors, the collector obtained in this invention has three main characteristics: First, the innovative molecular structure, for the first time, integrates and functionalizes terpolymers of ethylene terephthalate, isosorbide, and glutamic acid, achieving "integrated precision molecular engineering" with controllable main chain, tunable branches, and amplifiable sites. Second, enhanced synergistic adsorption, with multiple xanthate groups highly enriched on a rigid-flexible synergistic framework, can simultaneously anchor atoms on the surface of arsenopyrite, forming a stable hydrophobic film and significantly improving collection capacity and kinetic efficiency. Third, the raw materials possess both bio-based origin and high-value utilization characteristics of waste, the synthesis process is environmentally friendly, and the product is biodegradable, making it particularly suitable for the highly selective flotation and clean removal of arsenopyrite from complex polymetallic ores, providing a new technological approach for the comprehensive utilization of high-arsenic mineral resources.

[0021] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0022] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the present invention will be briefly described below. Obviously, the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0023] Figure 1 This is a molecular structure diagram of the low molecular weight soluble chelating collector prepared in Example 1 of the present invention; Figure 2 The images show actual samples of pre-flotation poison sand, slurry preparation, and chemical addition in Example 2 of this invention. Figure 3 This is a micrograph of the mineral phases of arsenopyrite before flotation in Example 2 of the present invention; Figure 4 This is a scanning electron microscope image of arsenopyrite after flotation in Embodiment 2 of the present invention; Figure 5 This is the X-ray photoelectron spectrum of arsenopyrite after flotation in Example 2 of the present invention. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] It should also be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and / or processing steps closely related to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0026] Additionally, it should be noted that the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0027] This invention provides a low-molecular-weight soluble chelating collector, the molecular structure of which is as follows: .

[0028] This invention also provides a method for preparing a low-molecular-weight soluble chelating collector, comprising the following steps: S1. Under inert gas protection, low molecular weight polyethylene terephthalate oligomer, isosorbide and the first catalyst are mixed and reacted at 160-220℃ for 2-6 h to obtain hydroxyl-terminated PET-ISO copolymer; wherein, the number average molecular weight of the low molecular weight polyethylene terephthalate oligomer is 800-1000 g / mol; The molar ratio of low molecular weight polyethylene terephthalate oligomer to isosorbide is 1:(0.8-1.5).

[0029] The reaction was carried out using a programmed temperature increase, first at 170-190℃ for 1-3 hours, and then at 200-220℃ for 2-4 hours.

[0030] The first catalyst is one of zinc acetate, manganese acetate, or antimony trioxide.

[0031] The amount of the first catalyst added is 0.1%-1.0% of the total mass of the reactants.

[0032] S2. Dissolve the hydroxyl-terminated PET-ISO copolymer obtained in step S1 in an aprotic solvent, add a condensing agent and a second catalyst, react with glutamic acid at 20-60℃ for 6-24h, and then separate and dry to obtain the glutamic acid-branched polymer. The condensing agent is N,N'-dicyclohexylcarbodiimide or N,N'-diisopropylcarbodiimide, the aprotic solvent is N,N-dimethylformamide or dimethyl sulfoxide, the catalyst is 4-dimethylaminopyridine, and the molar ratio of the carboxyl group in glutamic acid to the terminal hydroxyl group in the PET-ISO copolymer is (1.0-2.0):1.

[0033] S3. Dissolve the glutamic acid-branched polymer obtained in step S2 in an organic solvent, first add an alkaline solution for alkalization, then add carbon disulfide, react at room temperature for 4-12 hours, and then separate and dry to obtain a low molecular weight soluble chelating collector.

[0034] The organic solvent is acetone or tetrahydrofuran.

[0035] The alkaline solution is an aqueous solution of sodium hydroxide or potassium hydroxide with a concentration of 5%-15%.

[0036] This low-molecular-weight soluble chelating collector uses low-molecular-weight polyethylene terephthalate as a precursor. Through the introduction of isosorbide in a copolymerization reaction, precise control over the length and rigidity / flexibility of the molecular backbone is achieved. Furthermore, glutamic acid is innovatively introduced as a branching unit, leveraging its multifunctional properties to significantly enhance the branching degree and reactive site density of the molecular structure. Based on this, the hydroxyl groups at the molecular backbone and branch ends react efficiently with carbon disulfide, successfully constructing a low-molecular-weight fragment containing multiple xanthate functional groups, achieving a synergistic molecular design of "rigid backbone - flexible branch - multi-site collection".

[0037] The present invention also provides a method for collecting toxic arsine, comprising the following steps: A1. Mixing minerals containing arsenopyrite with water to form a slurry; A2. Adjust the pH of the slurry to 10-12, add a low-molecular-weight soluble chelating collector, and then add kerosene at a rate of 100g / t. 矿 Add foaming agent MIBC after 1 minute; the dosage of foaming agent MIBC is 25g / t. 矿 After 2-5 minutes, open the air valve to introduce air and begin flotation.

[0038] During the flotation process, bubbles were skimmed off every 5-10 seconds, and water was added every 30-40 seconds, repeating the process. The floated arsenopyrite concentrate was collected at cumulative flotation times of 1, 3, 6, and 10 minutes.

[0039] The total dosage of low-molecular-weight soluble chelating collector is 0.05-0.1 kg / t. 矿 .

[0040] The following are some specific embodiments. It should be noted that the embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in this field or according to the product instructions. Reagents or instruments used, unless otherwise specified, are all conventional products that can be obtained commercially.

[0041] Example 1 This embodiment provides a method for preparing a low-molecular-weight soluble chelating collector, comprising the following steps: S1. Preparation of main-chain prepolymer: Under inert gas protection, 100g of low molecular weight polyethylene terephthalate oligomer (number average molecular weight of 850g / mol), 18g of isosorbide, and 1.18g of zinc acetate were mixed; that is, the molar ratio of low molecular weight polyethylene terephthalate oligomer to isosorbide was 1:1; the amount of zinc acetate added was 1.0% of the total mass of the reactants. The mixture was reacted at 180℃ for 2h and then at 210℃ for 3h to obtain hydroxyl-terminated PET-ISO copolymer. S2. Branching reaction: The hydroxyl-terminated PET-ISO copolymer obtained in step S1 was dissolved in 200 ml of N,N-dimethylformamide, and 3.50 g of 4-dimethylaminopyridine, 1.2 g of N,N'-dicyclohexylcarbodiimide, and 36.28 g of glutamic acid were added. The molar ratio of the carboxyl group in glutamic acid to the terminal hydroxyl group in the hydroxyl-terminated PET-ISO copolymer was 2:1. The reaction was carried out at 40 °C for 12 h. After the reaction was completed, the copolymer was subjected to sedimentation, filtration, washing, and drying to obtain the glutamic acid-branched polymer. S3. Xanthate esterification reaction: The glutamic acid-branched polymer obtained in step S2 was dissolved in 500 ml of acetone. Sodium hydroxide solution (10% concentration) was added first for alkalization, and then 50 g of carbon disulfide was slowly added. The reaction was carried out at room temperature for 8 hours. After the reaction was completed, the polymer was settled, washed, and vacuum dried to obtain a low molecular weight soluble chelating collector (branched low molecular weight xanthate collector).

[0042] A schematic diagram of the molecular structure of this low-molecular-weight soluble chelating collector is shown below. Figure 1 As shown.

[0043] Example 2 A method for collecting arsenopyrite, using the aforementioned low-molecular-weight soluble chelating collector, includes the following steps: A1. Please combine Figure 2 , Figure 3 As shown, 1000 g of dry ore was mixed with water to obtain 3 L of mineral slurry containing arsenopyrite. The mineral slurry was then placed in an XFG-3 flotation machine for arsenopyrite collection and flotation. Water was added to bring the liquid level to a suitable position, the impeller speed of the flotation machine was set to 2000 r / min, and the slurry was adjusted for 2 minutes.

[0044] A2. Under conditions of pH 10, add 0.075 kg / t 矿 The low-molecular-weight soluble chelating collector prepared in Example 1 was then mixed with kerosene at a dosage of 100 g / t. 矿 Add foaming agent MIBC after 1 minute. The dosage of foaming agent MIBC is 25g / t. 矿 After 3 minutes, open the air valve to introduce air and begin flotation.

[0045] During the flotation process, bubbles are skimmed off every 5 seconds and water is added every 30 seconds, and this process is repeated.

[0046] The floated arsenopyrite concentrate was collected at cumulative flotation times of 1, 3, 6, and 10 minutes, respectively, resulting in four types of arsenopyrite concentrate. After filtration, the arsenopyrite concentrate was dried in an oven at 60°C, weighed, and the total recovery rate was calculated.

[0047] The total recovery rate of arsenopyrite concentrate is calculated by dividing the total mass of arsenopyrite concentrate by the total mass of the original minerals.

[0048] Comparative Examples 1-6 Compared with the method for collecting arsenopyrite in Example 2, the difference is that in step A2, the low molecular weight soluble chelating collector is replaced with a conventional collector, as shown in Table 1. The rest is roughly the same as in Example 2, and will not be repeated here.

[0049] Table 1. Flotation recoveries of Example 2 and Comparative Examples 1-6 As shown in Table 1, the low-molecular-weight soluble chelating collector provided by this invention exhibits extremely high selective collection ability for arsenopyrite, with a recovery rate of up to 93%, while the recovery rates for sphalerite, pyrite, and chalcopyrite are significantly lower (17-23%). In contrast, the traditional xanthate and black powder collectors used in Comparative Examples 1 to 6, although having a certain collection effect on arsenopyrite (recovery rate of 62-77%), are severely lacking in selectivity, resulting in the simultaneous collection of a large number of valuable minerals (especially sphalerite and chalcopyrite, with recovery rates as high as 69-83%), causing severe intermingling of the concentrate.

[0050] The arsenopyrite concentrate after flotation in Example 2 was observed using a scanning electron microscope, and the results are as follows: Figure 4 As shown, the collector achieves precise and stable chelation with iron and arsenic ions on the surface of arsenopyrite through its unique chelating functional groups, realizing molecular-level recognition and efficient adsorption. This not only efficiently recovers arsenopyrite but also greatly inhibits the flotation of other non-target minerals, fundamentally solving the technical bottleneck of separating arsenic from valuable metals in the flotation process of complex polymetallic ores.

[0051] Figure 5 The image shows the energy dispersive spectroscopy (EDS) analysis of the arsenopyrite concentrate obtained by flotation in Example 2.

[0052] Arsene (FeAsS) does not contain oxygen. The presence of oxygen indicates that a new substance is generated on the surface of the arsene. This reaction occurs only on the surface of the arsene and not on the surfaces of other minerals, demonstrating selectivity for specific minerals. This mechanism enables the recognition and efficient adsorption of reagents and mineral molecules. It not only efficiently recovers arsene but also greatly inhibits the flotation of other non-target minerals, fundamentally solving the technical bottleneck of separating arsenic from valuable metals in the flotation process of complex polymetallic ores.

[0053] Examples 3-4 and Comparative Examples 7-8 Compared with the method for collecting arsenopyrite in Example 2, the difference lies in the amount of low molecular weight soluble chelating collector added in step A2, as shown in Table 2. The rest is roughly the same as in Example 2 and will not be repeated here.

[0054] Table 2. Flotation recovery rates of Examples 2-4 and Comparative Examples 7-8 As shown in Table 2, the low molecular weight soluble chelating collector of the present invention can maintain high selective collection efficiency for arsenopyrite (arsenopyrite recovery rate ≥92%) in a wide dosage range of 0.05 to 0.10 kg / t, and can effectively inhibit the flotation of sphalerite, pyrite and chalcopyrite (recovery rate ≤29%).

[0055] In particular, the optimal balance between collection efficiency and selectivity was achieved at dosages of 0.075 kg / t (Example 2) and 0.10 kg / t (Example 4). However, in Comparative Example 7 (0.04 kg / t), the recovery rate of arsenopyrite decreased to 89% due to insufficient dosage, while in Comparative Example 8 (0.15 kg / t), the excessive dosage of the agent disrupted the selective adsorption mechanism, resulting in a significant increase in the recovery rate of non-target minerals (39% for sphalerite, 41% for pyrite, and 32% for chalcopyrite). This fully demonstrates the unique mechanism by which the chelating collector achieves saturated coordination adsorption with metal ions on the surface of arsenopyrite through its specific functional groups. At the optimal dosage, it can accurately cover the active sites of arsenopyrite, while excessive use will trigger non-selective physical adsorption, thereby leading to a decrease in selectivity. This characteristic is in stark contrast to the non-selective adsorption mechanism of traditional collectors.

[0056] Examples 5-6 and Comparative Examples 9-10 Compared with the method for collecting arsenopyrite in Example 2, the difference lies in the pH adjustment of the slurry in step A2, as shown in Table 3. The rest is roughly the same as in Example 2 and will not be repeated here.

[0057] Table 3. Flotation recoveries of Examples 2, 5-6 and Comparative Examples 9-10 As shown in Table 3, the collector of the present invention exhibits excellent selectivity and stability under weakly alkaline to alkaline conditions (pH value of 10-12), with the recovery rate of arsenopyrite remaining at a high level of over 90%. At the same time, the inhibitory effect on sphalerite, pyrite and chalcopyrite is significant and stable (recovery rate of all ≤23%).

[0058] In contrast, under acidic or neutral conditions (pH 9, Comparative Example 9), the recovery rate of arsenopyrite dropped sharply to 48%, and the recovery rates of all sulfide minerals increased significantly, indicating that the collector selectivity was completely lost under this environment and the minerals could not be separated. Under strongly alkaline conditions (pH 13, Comparative Example 10), the recovery rate of arsenopyrite dropped to 82%, proving that excessive alkalinity may have caused partial oxidation of the arsenopyrite surface or hindered the dissociation of the collector's active sites, thus affecting its optimal collection efficiency.

[0059] The above results highlight the unique mechanism of action of the collector of the present invention: its specific chelating functional group needs to be at a suitable OH⁻ concentration to achieve optimal reactivity and configuration, thereby accurately identifying and forming stable complexes with arsenic / iron ions on the surface of arsenopyrite. In contrast, traditional collectors are prone to selective failure when pH fluctuates. This proves that the reagent of the present invention has a wider adaptability window to pulp pH and more reliable industrial application potential.

[0060] It should be noted that the present invention is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments that have the same structure and perform the same effects as the technical concept within the scope of the present invention are included within the scope of the present invention. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of the present invention, are also included within the scope of the present invention.

Claims

1. A low-molecular-weight soluble chelating collector, characterized in that, The molecular structure of the low-molecular-weight soluble chelating collector is as follows: ； The preparation method of the low molecular weight soluble chelating collector includes the following steps: S1. Under inert gas protection, a low molecular weight polyethylene terephthalate oligomer, isosorbide, and a first catalyst are mixed and reacted at 160-220°C for 2-6 hours to obtain a hydroxyl-terminated PET-ISO copolymer; the number average molecular weight of the low molecular weight polyethylene terephthalate oligomer is 800-1000 g / mol; wherein the molar ratio of the low molecular weight polyethylene terephthalate oligomer to isosorbide is 1:(0.8-1.5); S2. Dissolve the hydroxyl-terminated PET-ISO copolymer obtained in step S1 in an aprotic solvent, add a condensing agent and a second catalyst, react with glutamic acid at 20-60℃ for 6-24 h, then separate and dry to obtain a glutamic acid-branched polymer; wherein, the molar ratio of the carboxyl group in the glutamic acid to the terminal hydroxyl group in the hydroxyl-terminated PET-ISO copolymer is (1.0-2.0):1; S3. Dissolve the glutamic acid-branched polymer obtained in step S2 in an organic solvent, first add an alkaline solution for alkalization, then add carbon disulfide, react at room temperature for 4-12 hours, and then separate and dry to obtain the low molecular weight soluble chelating collector.

2. The low molecular weight soluble chelating collector according to claim 1, characterized in that, In step S1, the reaction is carried out using a programmed temperature increase, first reacting at 170-190℃ for 1-3 hours, and then reacting at 200-220℃ for 2-4 hours.

3. The low molecular weight soluble chelating collector according to claim 1, in step S1, the first catalyst is one of zinc acetate, manganese acetate or antimony trioxide; the amount of the first catalyst added is 0.1%-1.0% of the total mass of the reactants.

4. The low molecular weight soluble chelating collector according to claim 1, characterized in that, In step S2, the condensing agent is N,N'-dicyclohexylcarbodiimide or N,N'-diisopropylcarbodiimide; the aprotic solvent is N,N-dimethylformamide or dimethyl sulfoxide; and the second catalyst is 4-dimethylaminopyridine.

5. A method for collecting arsenopyrite, using the low-molecular-weight soluble chelating collector as described in any one of claims 1-4, characterized in that, Includes the following steps: A1. Mixing minerals containing arsenopyrite with water to form a slurry; A2. Adjust the pH of the pulp to 10-12, add the low molecular weight soluble chelating collector, then add kerosene, followed by the frother MIBC; after 2-5 minutes, introduce air and begin flotation; wherein the total dosage of the low molecular weight soluble chelating collector is 0.05-0.1 kg / t. 矿 .

6. The method for collecting toxic arsenopyrite according to claim 5, characterized in that, During the flotation process, skim off the bubbles every 5-10 seconds and add water every 30-40 seconds.

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