Special grinding aid for gold ore and preparation method thereof

Abstract

The invention discloses a special grinding aid for gold ore and a preparation method thereof, and belongs to the technical field of mineral processing, the special grinding aid for gold ore comprises the following raw materials: a monomer, an initiator, a chain transfer agent and a solvent; the monomers are an unsaturated polyether monomer A and an unsaturated carboxylic acid monomer B; or a monomer C containing an ethylenically unsaturated sulfonic acid group. The preparation method comprises the following steps: putting the raw materials into a water bath kettle, and polymerizing in a separate dropwise adding manner to prepare the special grinding aid for the gold ore. The prepared grinding aid can improve the problems of particle agglomeration, low fine grinding efficiency, low gold dissociation efficiency and the like in the gold ore grinding process, the concentrated utilization of the grinding aid limited in the fields of cement, ceramics and the like is improved, the grinding energy consumption can be reduced, and the material quality can be improved.

Description

Technical Field

[0001] This invention belongs to the field of mineral processing technology, and in particular relates to a grinding aid for gold ore and its preparation method. Background Technology

[0002] With the gradual depletion of easily processed gold ore resources, difficult-to-process gold ores have become the main source of gold production. Grinding is a crucial step in the gold beneficiation process, especially playing a vital pretreatment role in cyanide leaching and flotation. Its operational efficiency not only affects the degree of ore particle liberation but also significantly impacts subsequent leaching effects, gold recovery rates, and overall production costs. In actual production, limited by equipment capacity and ore properties, grinding fineness often falls short of ideal levels, leading to insufficient gold mineral liberation, high gold grade in tailings, and decreased recovery rates. Therefore, developing composite grinding aids that combine grinding and leaching functions has become a current research hotspot. These grinding aids not only improve the rheological properties of the slurry and increase grinding efficiency but also promote gold dissolution during the leaching stage, enhancing overall recovery rates while reducing energy consumption and reagent usage, demonstrating promising industrial application prospects. Therefore, improving grinding efficiency and processing capacity without altering existing processes is an urgent problem to be solved, which also creates a real demand for developing efficient and environmentally friendly grinding aids.

[0003] Grinding gold ore presents numerous challenges, with the high energy consumption and low efficiency of grinding operations due to the ore's unique physicochemical properties being a key factor hindering the optimization of gold extraction processes. Despite extensive research focusing on improving grinding efficiency, a highly efficient grinding aid suitable for gold ore has yet to be discovered or developed. For example, water-reducing agents widely used in the cement industry currently include various types such as lignin sulfonates, naphthalene sulfonate formaldehyde condensates, and polycarboxylate-based water-reducing agents. However, research on the molecular structure design, mechanism of action, and industrial application cases of grinding aids in gold ore grinding remains extremely limited. Therefore, there is an urgent need to develop specialized grinding aids for gold ore through targeted molecular structure design, formulation optimization, and process parameter improvements to enhance its grinding performance and meet the production needs of different application scenarios.

[0004] To date, research on grinding aids used in gold ore grinding has primarily focused on inorganic grinding aids and the application of high-hardness materials such as quartz sand. However, this traditional grinding process generally suffers from high energy consumption and low efficiency, and is prone to over-grinding or insufficient liberation of the ore, thereby affecting the gold exposure and subsequent leaching effects. Looking at existing patents, most mature technologies are still concentrated on the development of water-reducing agents in cement systems, and have not yet been effectively extended to the gold mining field. Furthermore, the application of existing grinding aids largely relies on accumulated experience, lacking systematic theoretical support and research on their mechanisms of action, and often borrows formulation ideas from cement water-reducing agents, failing to form a groundbreaking theoretical framework and technological path. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention proposes a grinding aid specifically for gold ore and its preparation method.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A grinding aid specifically for gold ore, comprising the following raw materials:

[0008] Monomer, initiator, chain transfer agent, and solvent water;

[0009] The monomers are unsaturated polyether monomer A and unsaturated carboxylic acid monomer B;

[0010] or,

[0011] Monomer C containing an olefinic unsaturated sulfonic acid group.

[0012] Optionally, the unsaturated polyether monomer A is selected from at least one of methyl allyl polyoxyethylene ether (TPEG), allyl polyoxyethylene ether (HPEG) or isopentenyl polyoxyethylene ether (IPEG).

[0013] The unsaturated carboxylic acid monomer B is selected from at least one of acrylic acid (AA), methacrylic acid (MAA), or maleic acid (MA);

[0014] The monomer C containing an olefinic unsaturated sulfonic acid group is selected from at least one of 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS), vinyl sulfonic acid (VSA), or methacrylic sulfonic acid (MAS).

[0015] Furthermore, the molecular weight of the allyl polyoxyethylene ether is 3000-5000; preferably 3000.

[0016] Furthermore, the molar ratio of the unsaturated polyether monomer A to the unsaturated carboxylic acid monomer B is A∶B = 1∶10.

[0017] Optionally, the initiator is hydrogen peroxide (H2O2) and ascorbic acid (V).c A mixture of , or ammonium persulfate (APS) alone as an initiator.

[0018] Furthermore, the amount of the initiator added is 0.35~1.00 wt.% of the amount of the monomer added.

[0019] Optionally, the chain transfer agent includes trimercaptopropionic acid (3-MPA).

[0020] Furthermore, the amount of chain transfer agent added is 0.079% to 0.4 wt.% of the amount of monomer added.

[0021] A method for preparing a grinding aid specifically for gold ore includes the following steps:

[0022] The raw materials are mixed and then a water bath synthesis method is used to prepare the gold ore-specific grinding aid.

[0023] Optionally, the preparation method includes the following steps:

[0024] (1) Mix 10 wt.% monomer with deionized water, heat in a water bath while stirring, and add initiator after complete dissolution, stir evenly to obtain mixture 1;

[0025] (2) Mix the remaining monomers and deionized water to prepare material A; mix the chain transfer agent and deionized water to prepare material B;

[0026] (3) Heat the mixture 1, and at the same time, add material A and material B dropwise at a uniform rate. After the addition is completed, keep it warm and cool it. Then add a pH adjuster to control the pH of the product to 6~8, and finally prepare the gold ore special grinding aid (PAA).

[0027] Furthermore, the water bath heating temperature in step (1) is 50~80℃.

[0028] Furthermore, the heating temperature in step (3) is 50-80℃.

[0029] Furthermore, the heat preservation time mentioned in step (3) is 0.5-1 h.

[0030] Furthermore, the dripping time of material A in step (3) is 3 hours;

[0031] The dripping time for material B is 3.5 h.

[0032] Furthermore, the pH adjuster is a 30 wt.% NaOH solution.

[0033] Compared with the prior art, the present invention has the following advantages and technical effects:

[0034] 1. The raw materials used in this invention to prepare a grinding aid specifically for gold ore are readily available and require few types, with adjustable molecular structures and strong adaptability. Specifically, the raw materials synthesized in this invention contain only three systems: monomers (macromonomers TPEG / HPEG / IPEG + small monomers AA / MAA / MA, or AMPS / VSA / MAS), initiator, and chain transfer agent. By adjusting the polyether segment length, functional group types, and proportions, grinding aids with specific molecular structures can be designed. This allows for targeted optimization based on different ore properties and process requirements, effectively alleviating the problems of high energy consumption and excessive costs in the current grinding processes of gold ore and other materials.

[0035] 2. The grinding aid prepared by this invention has similar raw material sources to cement admixtures, resulting in good cost control. Its synthesis and application processes are simple and efficient, requiring no additional specialized equipment, thus effectively reducing labor input and energy consumption, demonstrating good economic efficiency and practicality. By selecting a large monomer with a certain molecular weight and adjusting the appropriate ratio, the grinding aid can be synthesized using cement ether polycarboxylate superplasticizer synthesis technology and equipment. The prepared grinding aid only needs to be directly added during the gold ore grinding process, which is convenient, efficient, requires a small dosage, and has a significant effect; it greatly improves grinding efficiency, achieving high efficiency, environmental protection, and energy conservation and emission reduction.

[0036] 3. This invention enriches the theoretical support for the system, demonstrating the grinding aid mechanism in the gold ore grinding process. It fills the gap in grinding aids in mineral processing, providing reliable theoretical and technical support for the preparation of other mineral grinding aids. It can be used alone or in combination with other organic / inorganic multifunctional additives, and has broad application prospects.

[0037] 4. When the monomers used are unsaturated polyether monomer A and unsaturated carboxylic acid monomer B, the present invention improves the grinding efficiency of gold ore through a dual action; specifically: the -COO- of acrylic acid is adsorbed on the negatively charged surface of gold ore, enhancing the repulsion between particles; the long-chain PEO of unsaturated polyether monomer A, such as HPEG, extends into the solution, forming a physical barrier to prevent particle agglomeration.

[0038] 5. When using monomer C containing an olefinically unsaturated sulfonic acid group, this invention utilizes the strongly ionic sulfonic acid group and the sterically hindered amide group. Specifically, -SO3H exhibits strong adsorption capacity, and the introduction of -CONH2 increases hydrolytic stability and provides additional adsorption sites. Attached Figure Description

[0039] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0040] Figure 1 The curve showing the change of particle size distribution in gold ore grinding with grinding time when PAA1 is used as a grinding aid;

[0041] Figure 2 The curve showing the change of particle size distribution with grinding time in gold ore grinding when PAA2 is used as a grinding aid;

[0042] Figure 3 The curve showing the change of particle size distribution with grinding time in gold ore grinding when PAA3 is used as a grinding aid;

[0043] Figure 4 Particle size distribution of gold ore as a grinding aid varies with grinding time.

[0044] Figure 5 The curve showing the change in particle size distribution of gold ore during grinding when sodium phosphate is used as a grinding aid;

[0045] Figure 6 The graph shows the particle size distribution of gold ore as a grinding aid, with varying dosage. The left graph shows the particle size distribution curve, and the right graph shows the cumulative particle size distribution curve.

[0046] Figure 7 This is a polarized light micrograph of the gold ore used in this invention. Detailed Implementation

[0047] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as a limitation of the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0048] It should be understood that the terminology used in this invention is merely for describing particular embodiments and is not intended to limit the invention. Furthermore, with respect to numerical ranges in this invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Every smaller range between any stated value or intermediate value within a stated range, and any other stated value or intermediate value within said range, is also included in this invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0049] Unless otherwise stated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. While only preferred methods and materials have been described herein, any methods and materials similar or equivalent to those described herein may be used in the implementation or testing of this invention. All references to this specification are incorporated by way of citation to disclose and describe methods and / or materials associated with those references. In the event of any conflict with any incorporated reference, the content of this specification shall prevail.

[0050] Various modifications and variations can be made to the specific embodiments described in this specification without departing from the scope or spirit of the invention, as will be apparent to those skilled in the art. Other embodiments derived from this specification will also be apparent to those skilled in the art. This specification and embodiments are merely exemplary.

[0051] The terms “include,” “including,” “have,” “contain,” etc., used in this article are all open-ended terms, meaning that they include but are not limited to.

[0052] This invention is based on polycarboxylic acid polymers and uses unsaturated polyether A and unsaturated acrylic acid monomer B, or sulfonic acid functional monomer C as the main raw materials. By regulating the molecular structure and introducing functional groups, a highly efficient functional polycarboxylic acid grinding aid suitable for gold ore systems is developed, aiming to improve grinding efficiency and enhance the dissociation and recovery performance of gold.

[0053] This invention discloses a grinding aid specifically for gold ore, comprising the following raw materials:

[0054] Unsaturated polyether monomer A, unsaturated carboxylic acid monomer B, initiator, chain transfer agent and solvent;

[0055] or,

[0056] Monomer C containing olefinically unsaturated sulfonic acid groups, initiator, chain transfer agent, and solvent;

[0057] Wherein, the unsaturated polyether monomer A is selected from at least one of methyl allyl polyoxyethylene ether (TPEG), allyl polyoxyethylene ether (HPEG), or isopentenyl polyoxyethylene ether (IPEG).

[0058] The unsaturated carboxylic acid monomer B is selected from at least one of acrylic acid (AA), methacrylic acid (MAA), or maleic acid (MA).

[0059] The monomer C containing an olefinic unsaturated sulfonic acid group is selected from at least one of 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS), vinyl sulfonic acid (VSA), or methacrylic sulfonic acid (MAS).

[0060] The initiators are hydrogen peroxide (H2O2) and ascorbic acid (V). c A mixture of ), or ammonium persulfate (APS);

[0061] The chain transfer agent is trimercaptopropionic acid (3-MPA);

[0062] The solvent is deionized water.

[0063] A method for preparing a grinding aid specifically for gold ore includes the following steps:

[0064] Unsaturated polyether monomer A + unsaturated carboxylic acid monomer B, or monomer C containing an olefinic unsaturated sulfonic acid group, are used as the main reactants, with H2O2 and V as the reactants. c The polymerization process involves either a redox system or the direct use of APS as an initiator and 3-MPA as a chain transfer agent. Polymerization is carried out in a water bath at a predetermined temperature using a dropwise addition method. The heating temperature is 50–80 °C, and the reaction time is 3.5 h. After the reaction is complete, the mixture is kept at this temperature for 0.5–1 h. Once the reaction product cools to below 40 °C, 30 wt.% NaOH standard solution is added until the pH of the reaction product reaches 6–8. Finally, deionized water is added to bring the total mass to the required level.

[0065] Specifically, the following steps are included:

[0066] (1) Mix a certain mass of monomer (polyether TPEG / HPEG / IPEG+AA / MAA / MA, or AMPS / VSA / MAS) with deionized water and place it in a three-necked flask as the base material. Place the mixture in a water bath at a certain temperature (50~80℃) and stir to pre-dissolve it for later use.

[0067] (2) Add a certain amount of 30% hydrogen peroxide and a certain amount of vitamin C to the base material in sequence;

[0068] (3) Mix the remaining monomer with deionized water to prepare material A; mix a certain amount of 3-MPA deionized water to prepare material B for later use;

[0069] (4) After the polyether mixture in the three-necked flask in step (2) is completely dissolved, heat it to 50-80℃. At the same time, use a peristaltic pump to add A and B materials at a uniform rate. Add A material for 3 hours and B material for 3.5 hours. After both A and B materials are added, keep it warm for 0.5-1 hours.

[0070] (5) After keeping warm, cool to below 40°C, neutralize the reaction product with a 30% NaOH solution and control the pH to 6~8 to obtain the grinding aid PAA.

[0071] In some alternative embodiments, the present invention is formed by random copolymerization of unsaturated polyether monomer A and unsaturated carboxylic acid monomer B; wherein the molar ratio of unsaturated polyether monomer A to unsaturated carboxylic acid monomer B is A∶B = 1∶10;

[0072] The amount of chain transfer agent used is 0.079~0.40% of the mass of the monomer (the monomer is (A+B) or C).

[0073] Initiator (H2O2+ V) c The dosage of (A+B) or APS is 0.35 to 1.00% of the mass of the monomer (the monomer is (A+B) or C).

[0074] In some optional embodiments, the unsaturated polyether monomer A used in this invention is HPEG, and the resulting grinding aid PAA is an alkali-resistant polymer with a comb-like molecular structure. The structure of the synthesized polymer (code-named HPEG-PCE) is shown below:

[0075]

[0076] In the above formula, the values ​​of the degree of polymerization are as follows:

[0077] k=10, l=1, m=1-100

[0078] The present invention also discloses the use of the above-synthesized high-efficiency comb-shaped polymer as a grinding aid in the gold ore grinding process, and the grinding aid contains only the polymer synthesized in this invention and does not contain any other reagents.

[0079] In summary, this invention aims to synthesize a highly efficient grinding aid for gold ore, addressing the issues of high energy consumption and low efficiency in mineral grinding and promoting its low-cost engineering applications. During the preparation process, multi-scale characterization (e.g., macroscopic particle size, microscopic functional groups) was employed, and rigorous variables were designed to synthesize a highly efficient polycarboxylic acid grinding aid. The optimized acid-ether ratio in the grinding aid increases the main chain charge density, enhancing the surface adsorption of mineral particles. Furthermore, altering the length of the polyoxyethylene side chains strengthens the steric hindrance effect, resulting in a grinding aid with strong dispersibility and flowability retention.

[0080] Unless otherwise specified, "room temperature" in this invention refers to 20-30℃.

[0081] Unless otherwise specified, the term "parts" in this invention refers to parts by weight.

[0082] All raw materials used in this invention were purchased commercially. The raw materials used in the preparation of the grinding aid in the embodiments of this invention include nine types: methyl allyl polyoxyethylene ether (HPEG-3000, HPEG-4000, HPEG-5000), acrylic acid (AA), 2-acrylamido-2-methylpropanesulfonic acid (AMPS), hydrogen peroxide (H2O2), trimercaptopropionic acid (3-MPA), and ascorbic acid (V... c Ammonium persulfate (APS), water as a solvent, and 30% NaOH are used to adjust the pH value of the final synthesized grinding aid.

[0083] The technical solution of the present invention will be further illustrated by the following embodiments.

[0084] Example 1 (Preparation of PAA1 (HPEG-3000 ∶AA=1:10) by water bath synthesis)

[0085] A method for preparing a grinding aid specifically for gold ore includes the following steps:

[0086] (1) Mix 3.6g of polyether HPEG, 0.864g of AA and 13g of deionized water in a three-necked flask as the base material, and place it in a water bath at 50°C. Stir and pre-dissolve the mixture for later use.

[0087] (2) Add 0.172g of 30% hydrogen peroxide and 0.0444g of vitamin C to the base material in sequence;

[0088] (3) Mix 32.4g of polyether (dissolved), 7.776g of AA and 15g of deionized water to prepare material A; mix 0.04g of 3-MPA and 15g of deionized water to prepare material B, and set aside.

[0089] (4) After the polyether mixture in the three-necked flask is completely dissolved, keep its temperature at 50°C; at the same time, use a peristaltic pump to add A and B materials at a uniform rate. Add A materials for 3 hours and B materials for 3.5 hours. After both A and B materials are added, keep the temperature for 1 hour.

[0090] (5) After keeping warm, cool to below 40°C, neutralize the reaction product with a 30% NaOH solution, control the pH to 6-8, add deionized water to make the product concentration 40%, and finally prepare the grinding aid PAA1.

[0091] Example 2 (HPEG-4000 ∶AA = 1 ∶ 10)

[0092] A method for preparing a grinding aid specifically for gold ore includes the following steps:

[0093] (1) Mix 6.00g of polyether HPEG, 1.08g of AA and 13g of deionized water in a three-necked flask as the base material, and place it in a water bath at 50°C. Stir and pre-dissolve the mixture for later use.

[0094] (2) Add 0.215g of 30% hydrogen peroxide and 0.0555g of vitamin C to the base material in sequence;

[0095] (3) Mix 54.00g of polyether (dissolved), 9.72g of AA and 15g of deionized water to prepare material A; mix 0.05g of 3-MPA and 15g of deionized water to prepare material B, for later use;

[0096] (4) After the polyether mixture in the three-necked flask is completely dissolved, keep its temperature at 50°C. At the same time, use a peristaltic pump to add A and B materials at a uniform rate. Add A materials for 3 hours and B materials for 3.5 hours. After both A and B materials have been added, keep the temperature for 1 hour.

[0097] (5) After keeping warm, cool to below 40°C, neutralize the reaction product with a 30% NaOH solution, control the pH to 6-8, add deionized water to make the product concentration 40%, and obtain the additive PAA2.

[0098] Example 3 (HPEG-5000∶AA =1∶10)

[0099] A method for preparing a grinding aid specifically for gold ore includes the following steps:

[0100] (1) Mix 5.023g of polyether HPEG, 0.723g of AA and 13g of deionized water in a three-necked flask as the base material, and place it in a water bath at 50°C. Stir and pre-dissolve the mixture for later use.

[0101] (2) Add 0.144g of 30% hydrogen peroxide and 0.0372g of vitamin C to the base material in sequence;

[0102] (3) Mix 45.207g of polyether (dissolved), 6.507g of AA and 15g of deionized water to prepare material A; mix 0.033g of 3-MPA and 15g of deionized water to prepare material B, for later use;

[0103] (4) After the polyether mixture in the three-necked flask is completely dissolved, keep its temperature at 50°C; at the same time, use a peristaltic pump to add A and B materials at a uniform rate. Add A materials for 3 hours and B materials for 3.5 hours. After both A and B materials are added, keep the temperature for 1 hour.

[0104] (5) After keeping warm, cool to below 40°C, neutralize the reaction product with a 30% NaOH solution, control the pH to 6-8, add deionized water to make the product concentration 40%, and finally prepare the grinding aid PAA3.

[0105] Example 4 (monomer is AMPS)

[0106] A method for preparing a grinding aid specifically for gold ore includes the following steps:

[0107] (1) Mix 2.00g of sulfonic acid functional monomer AMPS with 20.00g of deionized water in a three-necked flask as the base material, and place it in a water bath at 80°C. Stir the mixture evenly to pre-dissolve it.

[0108] (2) Mix 18.00g of sulfonic acid monomer AMPS with 20g of deionized water to prepare material A; mix 0.06g of 3-MPA, 0.20g of APS and 39g of deionized water to prepare material B, and set aside.

[0109] (3) After the monomer in the three-necked flask is completely dissolved, heat it to 80°C. At the same time, use a peristaltic pump to add A and B materials dropwise at a uniform rate. Add A materials for 3 hours and B materials for 3.5 hours. After both A and B materials have been added, keep it at the temperature for 0.5 hours.

[0110] (4) After keeping warm, cool to below 40°C, neutralize the reactants with a 30% NaOH solution, control the pH to 6-8, add deionized water to make the product concentration 20%, and obtain the grinding aid PAMPS.

[0111] Test sample: Sulfonic acid-containing polycarboxylic acid grinding aid obtained in Example 4

[0112] Test method: Weigh 38g of gold ore, add 0.076g (0.2% dosage) of PAMPS grinding aid, add water to make a slurry, place it in a planetary ball mill, set the material-to-ball ratio (mass ratio) to 5:1, the filling rate to 35%, the rotation speed to 500 r / min, and grind for 10 min. Measure the content of -200 mesh. Furthermore, by changing the dosage of grinding aid in Experimental Example 4 (0.3%, 0.4%, and 0.5%, all dosages being mass percentages), the effect of this dosage on the grinding aid effect was investigated.

[0113] Comparative Example 1

[0114] The difference from Example 1 is that commercially available inorganic grinding aid sodium phosphate is used.

[0115] Particle size analysis was performed on the products obtained by grinding gold ore with different amounts of sodium phosphate (3%, 5%).

[0116] The test conditions are the same as in Example 4.

[0117] Effect verification:

[0118] The synthesized high-efficiency comb-shaped organic polymers PAA1, PAA2, PAA3, and PAMPS were used as grinding aids. By adding the grinding aids to gold ore (where the amount of grinding aids added is 0.5 wt% of the mass of gold ore) and grinding for different times, the particle size distribution under different grinding times was compared.

[0119] Figure 1-4 The graphs show the particle size distribution of gold ore as a function of grinding time when PAA1, PAA2, PAA3, and PAMPS were used as grinding aids. The graphs show that PAA1 exhibited the best grinding aid effect at all test times (5, 10, and 20 minutes), with the smallest cumulative particle size distribution (D10, D50, D90). Especially at 20 minutes, PAA1 showed significantly better refining effect on large particles than other grinding aids. PAA1's molecular structure contains more efficient active groups, which can more effectively reduce particle strength and agglomeration. PAMPS, containing sulfonic acid groups, showed stability during grinding for a moderate time (10-15 minutes). Figure 6 It can also be observed that as the amount of grinding aid containing sulfonic acid functional groups increases, the grinding aid effect of sulfonic acid group grinding aid becomes better and better. This indicates that under certain conditions, sulfonic acid group can also produce a better grinding aid effect. Using only one monomer in the homopolymerization method can also produce a certain grinding aid effect, and it shows a significant effect compared with the inorganic grinding aid in Comparative Example 1.

[0120] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A special purpose grinding aid for gold ores, characterized in that, The raw materials include: monomers, an initiator, a chain transfer agent and water; the monomers are unsaturated polyether monomers A and unsaturated carboxylic acid monomers B; or, monomers C containing ethylenically unsaturated sulfonic acid groups.

2. A special grinding aid for gold ore as claimed in claim 1, wherein, The unsaturated polyether monomers A are selected from at least one of methyl allyl polyoxyethylene ether, allyl polyoxyethylene ether or iso-pentenyl polyoxyethylene ether; The unsaturated carboxylic acid monomers B are selected from at least one of acrylic acid, methacrylic acid or maleic acid; The monomers C containing ethylenically unsaturated sulfonic acid groups are selected from at least one of 2-acrylamido-2-methyl-1-propane sulfonic acid, vinyl sulfonic acid or methacryl sulfonic acid.

3. A special grinding aid for gold ore as claimed in claim 2, wherein, The molecular weight of the allyl polyoxyethylene ether is 3000-5000.

4. The special grinding aid for gold ore according to claim 1, characterized in that, The molar ratio of the unsaturated polyether monomers A to the unsaturated carboxylic acid monomers B is 1:

10.

5. The special grinding aid for gold ore according to claim 1, characterized in that, The initiator is ammonium persulfate, or a mixture of hydrogen peroxide and ascorbic acid; The addition amount of the initiator is 0.35-1.00 wt.% of the addition amount of the monomers.

6. A special grinding aid for gold ore as claimed in claim 1, wherein, The chain transfer agent includes trimercapto propionic acid; The addition amount of the chain transfer agent is 0.079%-0.4 wt.% of the addition amount of the monomers.

7. A method of preparing a special purpose grinding aid for gold ores, characterized by, The method includes the following steps: The raw materials are mixed, and then a water bath synthesis method is used to prepare the gold ore special grinding aid of any one of claims 1-6.

8. A method of preparing a special purpose grinding aid for gold ores as claimed in claim 7, characterised in that, The specific steps of the water bath synthesis method are: (1) 10 wt.% monomers are mixed with water, heated in a water bath, and after complete dissolution, an initiator is added, stirred uniformly, and a mixture 1 is obtained; (2) the remaining monomers are mixed with water to prepare A material; and a chain transfer agent is mixed with water to prepare B material; (3) the mixture 1 is heated, at the same time, the A material and the B material are added at a constant speed, after the addition is completed, the temperature is kept, cooled, then a pH regulator is added to control the pH of the product to be 6-8, and finally the gold ore special grinding aid of any one of claims 1-7 is prepared.

9. A method of preparing a special purpose grinding aid for gold ores as claimed in claim 8, characterised in that, The temperature of the water bath heating in step (1) is 50-80℃.

10. A method of preparing a special purpose grinding aid for gold ores as claimed in claim 8, characterised in that, The temperature of the heating in step (3) is 50-80℃; The dropping time of the A material is 3 h; The dropping time of the B material is 3.5 h.

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