A method of shielding organic carbon in a gold ore

Abstract

The application discloses a shielding method of organic carbon in gold ore, and relates to the technical field of mineral processing and precious metal metallurgy. The method comprises the following steps: maintaining the temperature of gold ore slurry containing organic carbon in a first predetermined temperature range; adding a hydrophobic organic matter in solid state at normal temperature into the slurry as an organic carbon shielding agent, and the temperature of the slurry is not lower than the melting point of the organic matter; stirring to melt the hydrophobic organic matter into liquid state and adsorb on the surface of the organic carbon; reducing the temperature of the slurry to below the melting point of the hydrophobic organic matter at a predetermined cooling rate, so that the hydrophobic organic matter is re-solidified to form a solid film layer covering the surface of the organic carbon. The application effectively prevents the gold-robbing effect of the organic carbon on gold cyanide complex ions, avoids the migration of the shielding agent to activated carbon, significantly improves the gold leaching recovery rate and the adsorption efficiency of activated carbon, reduces the reagent consumption, and simplifies the process.

Description

Technical Field

[0001] This invention relates to the fields of mineral processing and precious metal metallurgy, and in particular to a method for shielding organic carbon in gold ore. Background Technology

[0002] Ores containing organic carbon, such as sedimentary gold deposits, high-organic-carbon refractory gold deposits, black shale gold deposits, and Carlin-type gold deposits, contain a certain amount of organic carbon. Organic carbon has chemical properties similar to activated carbon, possessing a large specific surface area and strong adsorption capacity. During cyanide leaching or carbon-in-pulp (CIP) gold extraction, it strongly adsorbs dissolved gold-cyanide complex ions, leading to gold robbery and significantly reducing gold leaching recovery rates. In severe cases, it can even cause the cyanide leaching process to fail. Currently, the most common treatment technology for gold ores containing organic carbon involves adding oily or colloidal hydrocarbons such as diesel or kerosene to the slurry after bio-oxidation or high-pressure oxidation as an organic carbon shielding agent. Some existing technologies also use MBT (2-mercaptobenzothiazole) suspensions or alkaline solutions as organic carbon shielding agents.

[0003] However, existing organic carbon shielding machines have the following drawbacks: (1) Diesel and kerosene are liquid at room temperature, while MBT (2-mercaptobenzothiazole) exists in the slurry as a suspension or colloidal form. They are easily dispersed in the slurry, resulting in a large amount of reagent not being adsorbed by the organic carbon in the slurry, thus causing poor shielding effect against organic carbon. (2) In the subsequent carbon leaching process for gold, these liquid or suspension organic carbon shielding agents are easily desorbed from the surface of organic carbon and irreversibly transferred to the surface of activated carbon, which leads to a sharp decrease in the activity of activated carbon, seriously affecting the adsorption efficiency of activated carbon for gold cyanide complexes in solution, and ultimately causing a decrease in the gold leaching recovery rate.

[0004] (3) Existing organic carbon shielding agents in liquid or suspension form require a large amount of material. For example, when kerosene is used as an organic carbon shielding agent, the general dosage is 5-10 kg / ton of ore, and in special cases it can even be as high as 15 kg / ton of ore, which is very expensive.

[0005] Therefore, there is an urgent need to develop a new organic carbon shielding method that uses low dosage, has a good shielding effect, and does not affect the subsequent activated carbon adsorption effect. Summary of the Invention

[0006] In view of the above-mentioned defects or deficiencies in the prior art, the present invention provides a method for shielding organic carbon in gold ore. This method utilizes the residual heat of the ore slurry after oxidation to melt and adsorb room-temperature solid hydrophobic organic matter onto the surface of organic carbon. After cooling, the organic carbon surface solidifies to form a stable solid film layer, thereby permanently shielding the gold-stealing ability of organic carbon. Simultaneously, it prevents the organic carbon shielding agent from transferring to activated carbon, saving the amount of shielding agent used and significantly improving the gold leaching recovery rate.

[0007] This invention provides a method for shielding organic carbon in gold ore, comprising the following steps: maintaining the temperature of the gold ore slurry containing organic carbon within a first predetermined temperature range using the residual heat from the oxidation treatment of the slurry; adding a hydrophobic organic compound that is solid at room temperature to the slurry as an organic carbon shielding agent; wherein the temperature of the slurry is not lower than the melting point of the hydrophobic organic compound; stirring the slurry to which the hydrophobic organic compound is added for a predetermined time, so that the hydrophobic organic compound melts into a liquid state at the temperature of the slurry and adsorbs onto the surface of the organic carbon particles; reducing the temperature of the stirred slurry to below the melting point of the hydrophobic organic compound at a predetermined cooling rate, so that the liquid hydrophobic organic compound adsorbed on the surface of the organic carbon particles re-solidifies to form a solid film layer covering the surface of the organic carbon.

[0008] Furthermore, the amount of the hydrophobic organic compound added is determined according to the following formula: in, This indicates the amount of hydrophobic organic matter added, expressed in kg / ton of ore; This represents an empirical coefficient, with a value range of 0.005 to 0.02. This indicates the mass percentage of organic carbon in the ore; The specific surface area of ​​organic carbon is expressed in m². 2 / g.

[0009] Furthermore, the stirring time of the slurry with the added organic carbon shielding agent is determined according to the following formula: in, Indicates mixing time, in minutes; This indicates the particle size corresponding to a cumulative percentage of solid particles passing through the sieve when the total percentage reaches 80%, expressed in micrometers. This indicates the amount of organic carbon shielding agent added, expressed in kg / ton of ore. This is a proportionality coefficient, with a value ranging from 2000 to 3000; The particle size influence index ranges from 0.8 to 1.2. The value ranges from 0.2 to 0.5, representing the influence of the amount added.

[0010] Furthermore, the hydrophobic organic compound is selected from one or more of fatty acids, fatty acid esters, fatty alcohols, alkylphenols, polyolefins, and alkanes; or, the hydrophobic organic compound is selected from one or more of mineral waxes, animal and plant waxes, and synthetic waxes.

[0011] Furthermore, at least one functional group selected from carboxyl, hydroxyl, and epoxy groups is introduced into the molecular structure of the hydrophobic organic compound.

[0012] Furthermore, the predetermined cooling rate is 0.5~5°C / min.

[0013] Furthermore, the predetermined cooling rate is 1-3°C / minute.

[0014] Furthermore, the slurry can be cooled by natural cooling, stirring, or heat exchange.

[0015] Furthermore, the first predetermined temperature range is 42℃-95℃.

[0016] Furthermore, the melting point of the hydrophobic organic compound is 40℃-85℃.

[0017] The present invention provides a method for shielding organic carbon in gold ore by adding a hydrophobic organic compound, which is solid at room temperature, to the ore slurry and then melting the solid hydrophobic organic compound at a higher temperature. This allows the compound to fully wet and adsorb onto the surface of the organic carbon particles in the ore. When the temperature of the ore slurry drops below the melting point of the hydrophobic organic compound, the molten organic compound re-solidifies, forming a stable solid film layer on the surface of the organic carbon particles, thereby effectively preventing the adsorption of gold cyanide complex ions by the organic carbon.

[0018] The present invention has the following beneficial effects: (1) Significantly reduced the metal robbery effect of organic carbon This invention utilizes the cooling of molten hydrophobic organic matter to form a continuous and dense solid film on the surface of organic carbon, which effectively prevents gold cyanide complex ions from contacting organic carbon and significantly improves the gold leaching rate.

[0019] (2) It does not affect the subsequent adsorption of activated carbon. Because the solid film layer on the surface of organic carbon particles has extremely low migration ability in the slurry, it will not gradually transfer to the surface of activated carbon like liquid shielding agents (such as kerosene and diesel) or suspension shielding agents (such as 2-mercaptobenzothiazole), thus avoiding the problems of activated carbon poisoning and decreased adsorption capacity, allowing activated carbon to maintain high-efficiency adsorption performance for a long time.

[0020] (3) Low dosage of medicine This invention requires only a small amount of organic carbon shielding agent to form a dense solid film on the surface of organic carbon particles, which will not easily detach from the surface of the organic carbon particles. The amount used is far lower than that of existing liquid or suspended organic carbon shielding agents. In practice, the amount of shielding agent used is only 0.5-2 kg / ton of ore to significantly improve the gold recovery rate, while the amount of traditional kerosene can reach 5-15 kg / ton of ore.

[0021] (4) The process is simple, energy-saving and environmentally friendly. This invention can directly utilize the residual heat of the oxidized slurry or the heat generated during grinding to melt the solid hydrophobic shielding agent, requiring little or no additional heating. The cooling process can utilize natural cooling, stirring, or gentle heat exchange, eliminating the need for refrigeration equipment. The entire process does not produce harmful gases and poses no risk of environmental pollution. Attached Figure Description

[0022] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic flowchart of a method for shielding organic carbon in gold ore according to an embodiment of this application. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] In this invention, unless otherwise stated, the following terms have the following meanings: Organic carbon: refers to carbon elements existing in the form of organic matter in gold ore. It has a porous structure similar to activated carbon and a huge specific surface area. It has a strong adsorption capacity for gold cyanide complex ions and is the main cause of gold robbery.

[0025] Gold leaching refers to the phenomenon in cyanide leaching where organic carbon in the ore preferentially adsorbs dissolved gold cyanide complex ions, preventing gold from being recovered by subsequent activated carbon or resin, thus reducing the gold leaching rate.

[0026] Hydrophobic organic compounds: These refer to organic compounds whose molecular structure mainly contains hydrocarbon chains, have low polarity, and are water-repellent. In this invention, they specifically refer to organic compounds that are solid at room temperature (usually referring to production environment temperatures of 5℃-40℃), have a melting point below the temperature of the slurry after oxidation or grinding, and can preferentially adsorb onto the surface of hydrophobic organic carbon particles.

[0027] Melting point: refers to the phase transition temperature of a substance from a solid to a liquid state, measured in degrees Celsius (°C). In this invention, the melting point of the organic carbon shielding agent is a key parameter for selection, and it must meet the following requirements: higher than the upper limit of ambient temperature (approximately 40°C) to ensure that it remains solid at room temperature, and lower than or equal to the slurry temperature after oxidation or grinding to ensure that it can melt into a liquid state in the slurry.

[0028] Slurry: refers to a mixture of solid mineral particles and water. In this invention, slurry specifically refers to a suspension of organic carbon gold mineral material and water after oxidation or grinding treatment.

[0029] Organic carbon shielding agent: refers to a chemical agent added to mineral slurry to cover the surface of organic carbon particles and prevent them from adsorbing gold cyanide complex ions. The organic carbon shielding agent of this invention is a hydrophobic organic compound, and its mechanism of action is physical covering rather than chemical reaction.

[0030] Melt adsorption: This refers to the process by which a solid organic carbon shielding agent, after melting into a liquid state in a high-temperature slurry, migrates to the surface of organic carbon particles and adheres therethrough through stirring. This process relies on the low viscosity and good flowability of the molten organic matter.

[0031] Solid film layer: This refers to the process by which the liquid shielding agent adsorbed on the surface of organic carbon particles re-solidifies to form a solid coating when the slurry temperature drops below the melting point of the shielding agent. The solid film layer has high mechanical strength and is not easy to fall off, thus providing a long-lasting shield against organic carbon.

[0032] d 80 This indicates the particle size at which the cumulative percentage of solid particles passing through the sieve in the slurry reaches 80%. In other words, 80% of the solid particles have a particle size less than or equal to this value, and the remaining 20% ​​have a particle size greater than this value. d 80 It is a commonly used indicator to characterize the fineness of material grinding.

[0033] Specific surface area: refers to the total surface area of ​​a unit mass of substance. The specific surface area of ​​organic carbon is directly related to its metal-boring ability; the larger the specific surface area, the stronger the adsorption capacity.

[0034] The present invention provides a method for shielding organic carbon in gold ore by adding a hydrophobic organic compound, which is solid at room temperature, to the ore slurry and then melting the solid hydrophobic organic compound at a higher temperature. This allows the compound to fully wet and adsorb onto the surface of the organic carbon particles in the ore. When the temperature of the ore slurry drops below the melting point of the hydrophobic organic compound, the molten organic compound re-solidifies, forming a stable solid film layer on the surface of the organic carbon particles, thereby effectively preventing the adsorption of gold cyanide complex ions by the organic carbon.

[0035] Specifically, the method includes the following steps: Step S101: Maintain the temperature of the gold ore slurry containing organic carbon within a first predetermined temperature range.

[0036] Gold ore slurries containing organic carbon typically originate from Carlin-type gold ore or their flotation concentrates after oxidation treatment. Oxidation treatment can be high-temperature, high-pressure oxidation (temperatures between 190-280°C) or biological oxidation (temperatures around 45°C). The oxidized slurry has a high temperature when discharged from the reactor, which can then be controlled between 42°C and 95°C through natural cooling, stirring, and other methods.

[0037] The reason why the temperature of the oxidized slurry is controlled within the preferred range of 42-95℃ in this embodiment is that it has been rigorously screened through a large number of experiments, taking into account both process convenience and the shielding effect of organic carbon.

[0038] Specifically: The lower limit temperature of 42℃ is higher than the general upper limit of mining production environment temperature (i.e., 40℃), and also higher than the melting point of most hydrophobic organic compounds. If the slurry temperature is below 42℃, some hydrophobic organic compounds with melting points between 40-42℃ may not melt sufficiently, resulting in excessively high viscosity, poor fluidity, and difficulty in uniformly adsorbing onto the surface of organic carbon. In addition, 42℃ is very close to the typical discharge temperature limit of bio-oxidation processes (approximately 45℃), which has a practical technological basis. If the lower limit temperature is further increased, additional fuel is often required to raise the slurry temperature, which increases production costs.

[0039] The lower limit temperature of 95°C is below the boiling point of water (i.e., 100°C), avoiding boiling of the slurry which could cause operational difficulties and reagent volatilization. At the same time, approximately 95°C is also a common temperature after flash evaporation cooling of the discharged ore following high-pressure oxidation. While it is still possible to melt hydrophobic organic compounds with higher melting points if the temperature exceeds 95°C, it increases energy consumption and operational risks. Furthermore, as will be known from subsequent steps, the upper limit of the melting point of the hydrophobic organic compounds in this invention is preferably set at approximately 85°C, and 95°C is sufficient to melt all selected hydrophobic organic compounds while maintaining low viscosity.

[0040] In summary, this embodiment effectively utilizes the residual heat of the slurry after oxidation treatment, and basically no additional heating is required to meet the temperature requirements for the subsequent melting of the organic carbon shielding agent, greatly simplifying the process conditions.

[0041] Step S102: Add a hydrophobic organic compound that is solid at room temperature to the slurry as an organic carbon shielding agent; wherein the temperature of the slurry is not lower than the melting point of the hydrophobic organic compound.

[0042] Specifically, this step involves adding a hydrophobic organic compound that is solid at room temperature (generally 5-40°C in the art) to the slurry within a first predetermined temperature range as an organic carbon shielding agent.

[0043] First, hydrophobic organic materials are chosen because the natural organic carbon in the ore has a significantly hydrophobic surface with low surface energy, making it difficult for hydrophilic substances to adsorb onto its surface. Hydrophobic organic materials and organic carbon surfaces share similar chemical properties; based on the principle of "like dissolves like," they interact, allowing the hydrophobic organic materials to preferentially and firmly adsorb onto the organic carbon surface. This selective adsorption characteristic is one of the key factors in achieving efficient shielding while reducing reagent waste in this invention.

[0044] Secondly, hydrophobic organic compounds that are solid at room temperature are chosen because when these compounds are added to the slurry, they melt into a liquid state after the slurry is heated to a high temperature. This liquid liquid then adsorbs onto the surface of the organic carbon particles. After cooling, the liquid hydrophobic organic compounds on the organic carbon surface transform back into a dense solid film, tightly encapsulating the organic carbon particles. This not only enhances the shielding effect of the organic carbon but also makes it difficult for the shielding agent in the dense solid film state to detach from the surface of the organic carbon particles and transfer to the activated carbon during the subsequent carbon leaching process. This ensures the activated carbon's adsorption capacity for gold cyanide complex ions, indirectly increasing the gold leaching rate.

[0045] The hydrophobic organic compound that is solid at room temperature in this embodiment can be selected from one or more of fatty acids, fatty acid esters, fatty alcohols, alkylphenols, polyolefins and alkanes; or, the hydrophobic organic compound can be selected from one or more of mineral waxes, animal and plant waxes and synthetic waxes.

[0046] The fatty acids are selected from, but not limited to, stearic acid (melting point 69-71℃), palmitic acid (melting point 63-64℃), etc. More preferably, the molecular structure contains a polar carboxyl group head and a nonpolar long carbon chain tail, so that in the molten state, the carboxyl group can interact with the oxygen-containing functional groups on the surface of the organic carbon through hydrogen bonds, while the carbon chain forms a hydrophobic bond with the aromatic structure or aliphatic chain of the organic carbon to form a stable adsorption layer.

[0047] Fatty acid esters are selected from, but are not limited to, cetyl esters (melting point about 70°C), which are the main components of natural waxes, are completely hydrophobic and have excellent compatibility with organic carbon.

[0048] Fatty alcohols are selected from, but are not limited to, hexadecyl alcohol (melting point about 49°C) and octadecyl alcohol (melting point about 58°C), which have a strong adsorption capacity for organic carbon particles.

[0049] Alkylphenols are selected from, but are not limited to, nonylphenol (melting point about 46°C), which has an aromatic ring structure. It undergoes π-π stacking with the aromatic structure in organic carbon, resulting in stronger adsorption.

[0050] Polyolefins and alkanes are selected from, but not limited to, polyethylene wax (low molecular weight, melting point about 60-80℃) and paraffin wax (melting point 52-70℃). They are composed entirely of hydrocarbon chains, highly compatible with the hydrophobic regions on the surface of organic carbon, and chemically inert, and do not react with cyanide leaching agents.

[0051] Mineral waxes, animal and plant waxes, and synthetic waxes are natural or synthetic mixtures of the above-mentioned pure compounds, with low cost and good industrial availability. For example, No. 52 paraffin wax (melting point approximately 52-54°C) showed excellent results in the following examples.

[0052] Furthermore, in this embodiment, the melting point of the hydrophobic organic compound is controlled between 40-85°C because: The lower melting point limit was set at 40°C because this temperature is slightly higher than the upper limit of ambient temperature in most mining areas worldwide (i.e., extreme high temperatures of approximately 40°C). Choosing 40°C as the lower melting point limit ensures that the shielding agent can completely solidify under natural cooling conditions (e.g., cooling to below 40°C). If the melting point were below 40°C, in tropical summers or high-temperature environments deep in mines, the shielding agent might remain in a semi-molten state, unable to form a stable solid film. Furthermore, there would still be a significant risk of the shielding agent on the surface of the organic carbon particles migrating to the activated carbon during the carbon impregnation process.

[0053] The upper limit of the melting point was set at 85℃ because numerous experiments have shown that hydrophobic organic compounds with higher melting points typically have larger molecular weights and higher viscosity, resulting in slower adsorption kinetics and a decreased effectiveness of organic carbon shielding. Furthermore, the common temperature after flash cooling of the ore discharged from high-pressure oxidation is approximately 90-95℃. The upper limit of the melting point at 85℃ is lower than the upper limit of the slurry temperature after oxidation cooling (95℃), ensuring that the hydrophobic organic compounds can completely melt within the slurry temperature range. If the melting point is higher than 85℃, such as 90℃, even if the slurry temperature reaches 95℃, it is only 5℃ higher than the melting point, and the melt viscosity remains high, which is not conducive to the uniform spreading of liquid organic compounds.

[0054] Furthermore, the specific amount of hydrophobic organic matter added needs to be controlled relatively precisely because: On the one hand, if the amount of hydrophobic organic matter added is insufficient, a continuous and dense solid coating layer cannot be formed on the surface of organic carbon, which will affect the shielding effect of organic carbon and the gold leaching rate. On the other hand, if the amount of hydrophobic organic matter added is excessive, the shielding agent exceeding the surface coating of organic carbon cannot be adsorbed and exists in the slurry in a free state. These free shielding agents may adhere to the surface of activated carbon during the subsequent leaching process, occupy the adsorption sites of activated carbon and encapsulate activated carbon, reducing its adsorption rate for gold cyanide complex ions.

[0055] On the other hand, excessive organic carbon shielding agents may increase the viscosity of the slurry, affecting the efficiency of subsequent processes such as stirring, pumping, and leaching, and increasing production energy consumption.

[0056] On the other hand, organic carbon shielding agents are consumables, and excessive addition will directly increase the cost of the agent. Taking a mine that processes 1 million tons of ore per year as an example, adding 0.5 kg of shielding agent per ton of ore can increase the annual cost by hundreds of thousands to millions of yuan.

[0057] This embodiment designs a calculation method that can relatively accurately calculate the range of organic carbon shielding agent addition amounts. Combined with extensive experiments, the optimal addition amount can be determined. This method assumes that various hydrophobic organic compounds have the same or similar affinity for organic carbon.

[0058] Specifically, the amount of hydrophobic organic matter added increases with the increase of organic carbon content in the ore. This is because the role of the shielding agent is to cover the surface of the organic carbon, and the amount of shielding agent used... The total surface area S of organic carbon is directly proportional to the total surface area of ​​organic carbon, and the total surface area S is positively correlated with the content of organic carbon. Therefore, the total surface area S of organic carbon that the shielding agent needs to cover is equal to the mass M of organic carbon multiplied by the specific surface area of ​​organic carbon. The mass M of organic carbon can be expressed as the percentage of organic carbon in the ore by mass. To represent the specific surface area of ​​organic carbon Using the surface area per gram of organic carbon, we can obtain the following formula: Total surface area of ​​organic carbon S (m 2 / ton of ore) = [10 × [(kg)] × [1000 (g / kg)] × (m 2 / g) = 10 4 × × .

[0059] Since the shielding agent needs to form an effective covering layer on the organic carbon surface, assuming the mass of shielding agent required to cover a unit area is... (Unit: g / m) 2 (In practice, this can be obtained by measuring and inferring from experimental data), so we can get the following formula: Dosage of shielding agent (g / ton of ore) = × (10 4 × × ) = 10 4 × ρ × × = k'× × ,in .

[0060] If the amount of shielding agent is used Converting the unit to kg / ton of ore, we can deduce that: = in, .

[0061] The final amount of shielding agent can be calculated using the following formula: ; ; ; in, This indicates the amount of hydrophobic organic matter added, expressed in kg / ton of ore; Represents the empirical coefficient. The required shielding agent mass per unit area (Unit: g / m) 2 ) was calculated; This indicates the mass percentage of organic carbon in the ore; for example, a value of 1.32 represents 1.32%. The specific surface area of ​​organic carbon is expressed in m². 2 / g.

[0062] Furthermore, the mass of shielding agent required per unit area mentioned above The measurement process is exemplified as follows: First, a typical Carlin-type gold ore sample was selected, and its mass percentage of organic carbon was determined. and specific surface area Calculate the total surface area S (m²) of organic carbon. 2 / ton of ore) = 10 4 × × .

[0063] Then, set 3-5 different amounts of shielding agent added. (g / ton of ore), under the same conditions, melt adsorption, cooling solidification and cyanide leaching tests were conducted.

[0064] Then, using the gold leaching recovery rate reaching the platform value as the criterion, the minimum addition amount required to achieve the shielding effect was determined. .

[0065] Finally, the required mass of shielding agent per unit area can be calculated by reverse calculation using the following formula. : = = / (10 4 × × ).

[0066] because This represents the ratio of the minimum mass of shielding agent required to form an effective shielding layer on the surface of organic carbon to the total surface area of ​​the organic carbon. Here, "effective shielding layer" refers to the amount of shielding agent coverage required to improve gold leaching recovery to an acceptable level. Because the minimum coverage required to achieve this function varies depending on the ore, the hydrophobic organic material, and the process conditions,... It is a range of values, not a single fixed value.

[0067] For example, for conventional Carlin-type gold deposits ( It is 0.5%-3%. 50-200 m 2 / g) The empirical range for reverse calculation is 0.0005-0.002 g / m 2 ,according to Calculated empirical coefficients With a value ranging from 0.005 to 0.02, the amount of hydrophobic organic matter added can be 0.2-3 kg / ton of ore. Preferably, the amount added is 0.5-1.5 kg / ton of ore.

[0068] The dosage of shielding agent calculated according to the above formula can achieve the optimal balance between shielding effect and economic benefits. It avoids insufficient inhibition of gold robbery by organic carbon due to insufficient addition, and also avoids waste of reagents and activated carbon poisoning due to excessive addition. It provides a precise, reliable and economical process control method for the industrial processing of gold mines with high organic carbon content.

[0069] Step S103: Stir the slurry containing the hydrophobic organic material for a predetermined time so that the hydrophobic organic material melts into a liquid state at the temperature of the slurry and is adsorbed onto the surface of the organic carbon particles.

[0070] Specifically, stirring can provide mechanical shear force to the slurry, dispersing the molten hydrophobic organic matter into tiny droplets, increasing the probability of collision with organic carbon particles, and promoting the spread, wetting and adsorption of droplets on the surface of organic carbon.

[0071] The adsorption of hydrophobic organic compounds in the molten state onto the surface of organic carbon is a physical process, and the main driving factors include: (1) Hydrophobic interaction. The surface of organic carbon is rich in aromatic ring structures, which will generate strong van der Waals forces and hydrophobic bonds with the carbon chains of molten hydrocarbons or fatty acid esters.

[0072] (2) Wetting and spreading. Low-viscosity, molten hydrophobic organic matter has a contact angle of less than 90° on the surface of organic carbon and can automatically spread to form a thin film.

[0073] (3) Capillary action. The porous structure of organic carbon generates capillary force, which draws molten liquid into the pores to achieve deep coverage.

[0074] Furthermore, the stirring time of the slurry is closely related to the particle size of the solid particles in the slurry. This is because the smaller the particle size, the larger the specific surface area, and the more organic carbon surface sites need to be covered; at the same time, fine particles are prone to agglomeration, requiring a longer time to disperse the agglomerated material; in addition, the molten liquid requires a longer kinetic time to fully spread in the micropores.

[0075] The preferred slurry mixing time in this embodiment is determined by the following empirical formula: in, Indicates mixing time, in minutes; This indicates the particle size corresponding to a cumulative percentage of solid particles passing through the sieve when the total percentage reaches 80%, expressed in micrometers. This indicates the amount of organic carbon shielding agent added, expressed in kg / ton of ore. This is a proportionality coefficient, with a value ranging from 2000 to 3000; The particle size influence index ranges from 0.8 to 1.2. The value ranges from 0.2 to 0.5, representing the influence of the amount added.

[0076] The empirical formula proposed in this invention reflects the importance of stirring time. The particle size corresponding to the cumulative percentage of solid particles under sieve in the slurry reaching 80%. and the amount of organic carbon shielding agent added. Closely related. It should be noted that this formula is an empirical formula derived from fitting a large amount of experimental data. Its purpose is to quantitatively describe the engineering relationships between process parameters, rather than to construct a strict dimensional equation. Therefore, when applying the above empirical formula, simply use the units (d) specified in the instruction manual for each parameter. 80 Substituting Q (measured in micrometers, and Q in kg / ton of ore) into the equation, the stirring time T (in minutes) can be calculated, providing practical guidance for the process. Those skilled in the art will understand the rules of this empirical formula and will not find it ambiguous due to its dimensional form.

[0077] Specifically: The smaller the particle size of the slurry, the larger the total surface area of ​​organic carbon per unit mass of slurry. However, fine particles are prone to agglomeration, requiring longer stirring times to fully disperse the hydrophobic organic matter in the molten state and cover the surface of all organic carbon particles. Therefore, stirring time has a negative power-law relationship with particle size (i.e., T ∝ d). 80 -n ).

[0078] The higher the amount of shielding agent added, the longer it takes to disperse into tiny droplets and collide with and adsorb organic carbon particles. However, due to the saturation effect of adsorption, the increase in stirring time is less than the increase in the amount added. Therefore, the stirring time and the amount added have a sublinear positive power law relationship (T ∝ Q). m 0 <m<1)。

[0079] α is a proportionality coefficient, which comprehensively reflects the influence of process conditions such as stirring intensity, slurry viscosity, and temperature on the adsorption rate. The higher the stirring intensity, the higher the adsorption rate. The smaller the value, the greater the viscosity of the slurry. The larger the value, the lower the pulp temperature. The value of can be larger. The specific value can be determined through experiments or experience.

[0080] For example, when the pulp temperature is 70-90℃, d 80 75μm, stirring linear velocity 1-2 m / s, amount of hydrophobic organic matter When the volume is in the range of 0.5-1.5 kg / t, we can take α=2500, n=1, and m=0.3. At this time, the stirring time T≈33 minutes.

[0081] It is important to note that while the stirring time does not need to strictly adhere to the formula calculated above, excessively short stirring times will prevent the liquid hydrophobic organic matter from fully adsorbing onto the surface of the organic carbon particles. This will result in the subsequent curing film not completely coating the organic carbon particles, leading to poor shielding effectiveness and impacting the gold leaching rate. Conversely, excessively long stirring times will cause mechanical desorption of the adsorbed hydrophobic organic matter, reducing the shielding effect and similarly affecting the gold leaching rate, while also increasing energy consumption. Therefore, the actual stirring time should be as close as possible to the time calculated by the formula to achieve the best adsorption effect.

[0082] The stirring time calculated according to this step results in extremely low levels of free hydrophobic organic matter in the slurry. Most of the hydrophobic organic matter will be firmly adsorbed onto the surface of the organic carbon particles, laying the foundation for subsequent solidification and locking.

[0083] Step S104: The temperature of the stirred slurry is reduced to below the melting point of the hydrophobic organic matter at a predetermined cooling rate, so that the liquid hydrophobic organic matter adsorbed on the surface of the organic carbon particles is re-solidified to form a solid film covering the surface of the organic carbon particles.

[0084] Specifically, the temperature of the slurry can be reduced through natural cooling, stirring cooling, or heat exchange cooling. Factors such as the concentration of the slurry, the area of ​​the container, the stirring rate, and the heat exchange method all affect the cooling rate, which plays a crucial role in the density of the solid film layer on the surface of the organic carbon particles.

[0085] Specifically, when the temperature drops below the melting point, the thermal motion of molecules in liquid hydrophobic organic materials weakens, and intermolecular forces (such as van der Waals forces and hydrogen bonds) become dominant, leading to the orderly arrangement of molecules to form crystalline or semi-crystalline solids. If the cooling rate is low (e.g., below 0.5℃ / min), the molecules have sufficient time for orderly arrangement and crystal growth. The number of crystal nuclei is small, but the crystal growth is sufficient, resulting in larger, more regularly arranged grains. The film is dense, with fewer defects and lower internal stress, effectively sealing the pores and active sites on the surface of organic carbon, providing excellent shielding. However, an excessively low cooling rate will lead to excessively long cooling times, reduced production efficiency, and lower equipment turnover. If the cooling rate is high (e.g., above 5°C / min), the molecules do not have enough time to arrange themselves in an orderly manner during the cooling process, the number of crystal nuclei increases sharply, and crystal growth is limited, resulting in a large number of fine grains. The film structure is loose, with many inter-grain interfaces and high porosity. Furthermore, the thermal stress generated by rapid cooling may cause microcracks in the film, allowing gold cyanide complex ions in the subsequent carbon impregnation process to still contact the organic carbon through these micro-channels, reducing the shielding effect of the organic carbon. In addition, rapid cooling may require additional heat exchange equipment, which will increase production costs.

[0086] Therefore, considering both shielding effectiveness and production efficiency, and after extensive experimental comparisons, an acceptable cooling rate is 0.5~5℃ / min, with a preferred cooling rate of 1-3℃ / min. Within this cooling rate range, hydrophobic organic materials can form a continuous, dense crystalline film with few defects, while the cooling time is reasonable and suitable for industrial production. More preferably, a cooling rate of 2℃ / min achieves the optimal balance between film density and production efficiency.

[0087] Furthermore, after shielding the organic carbon in the slurry, the process also includes step S105: subsequent cyanide leaching and adsorption recovery.

[0088] This step involves leaching and adsorption of precious metals into the treated slurry, including adsorption using activated carbon or ion exchange resins. Because the organic carbon surface is shielded by a dense solid film, the gold cyanide complex ions are almost not hijacked by the organic carbon, thus allowing for efficient recovery by activated carbon or resins. Since this step is a standard process in the art, it will not be described in detail in this embodiment.

[0089] Example 1 The sample was obtained from the flotation concentrate of the Kalin-type gold ore deposit in Saipan, Laos, with a gold grade of 6.8 g / t and an organic carbon content of 1.25%.80 =100μm, SSA=80 m 2 / g. The temperature of the bio-oxidized slurry was maintained at approximately 42℃; solid C8-C10 mixed fatty acids with a melting point of 40℃ were added at an addition rate of 0.008×1.25×80=0.8 kg / t; then, the mixture was stirred at 300 rpm (impeller linear velocity approximately 1.5 m / s) for 25 minutes (T=2500 / 100×Q^0.3≈25×0.93≈23.25 minutes, taking 25 minutes); then, it was cooled to 30℃ at a cooling rate of 1℃ / min; finally, cyanide leaching was carried out for 48 hours under the conditions of pH 10.5, NaCN 1.2 kg / t, and activated carbon 40 g / L. The experimental results showed that the gold leaching recovery rate was 80.3%, the adsorption efficiency of activated carbon after 2 weeks of use was still 94% of that of fresh carbon, and the liquid phase gold loss (i.e., gold that was not adsorbed by activated carbon and remained in the solution in the form of gold cyanide complex ions) was 0.09 mg / L.

[0090] Under the same process conditions, without the addition of a shielding agent, the experimental results were as follows: the gold leaching recovery rate was 75.2%, the adsorption efficiency of activated carbon after 2 weeks of use was about 96% of that of fresh carbon, and the liquid phase gold loss was 0.06 mg / L.

[0091] Compared with the method without a shielding agent, the shielding method in this embodiment increases the gold leaching recovery rate by 5.1 percentage points, while maintaining similar activated carbon adsorption efficiency and liquid phase gold loss. This indicates that the shielding method in this embodiment effectively improves the gold recovery rate while having virtually no adverse effect on the performance of activated carbon.

[0092] Table 1. Comparison of experimental results in Example 1 with and without shielding agent. Example 2 The sample was obtained from the flotation concentrate of the Kalin-type gold ore deposit in Saipan, Laos, with a gold grade of 9.2 g / t and an organic carbon content of 1.68%. 80 =45μm, SSA=120 m 2 / g. The slurry after high-pressure oxidation was maintained at approximately 95°C; behenic acid with a melting point of 82°C was added at a rate of Q = 0.01 × 1.68 × 120 ≈ 2.02 kg / t; then it was stirred at 300 rpm (impeller linear velocity approximately 1.5 m / s) for 60 minutes (T = 2600 × 45). -1 · 1 ×2 0 · 4(Approximately 55 minutes, 60 minutes were taken); then cooled to 50°C at a cooling rate of 3°C / min. Subsequently, cyanide leaching was carried out for 48 hours under the conditions of pH 10.5, NaCN 1.2 kg / t, and activated carbon 40 g / L. Experimental results showed: gold leaching recovery rate of 87.2%, activated carbon adsorption efficiency still 93% of fresh carbon after 2 weeks of use, and liquid phase gold loss of 0.1 mg / L.

[0093] Under the same process conditions, without the addition of a shielding agent, the experimental results showed that the gold leaching recovery rate was 73.5%, the adsorption efficiency of activated carbon after 2 weeks of use was about 97% of that of fresh carbon, and the liquid phase gold loss was 0.07 mg / L.

[0094] Compared with the method without a shielding agent, the shielding method in this embodiment increases the gold leaching recovery rate by 13.7 percentage points, while maintaining similar activated carbon adsorption efficiency and liquid phase gold loss. This indicates that the shielding method in this embodiment significantly improves the gold leaching recovery rate while having virtually no adverse effect on the performance of activated carbon.

[0095] Table 2 Comparison of experimental results in Example 2 with and without shielding agent Example 3 The sample was obtained from the flotation concentrate of the Kalin-type gold ore deposit in Saipan, Laos, with a gold grade of 7.5 g / t and an organic carbon content of 1.45%. 80 =80μm, SSA=90m 2 / g. The slurry after high-temperature oxidation was maintained at approximately 65°C. Cetyl alcohol with a melting point of 49°C was added at a rate of Q = 0.008 × 1.45 × 90 ≈ 1.04 kg / t. The stirring time was then calculated to be approximately 31.6 minutes, and in practice, stirring was performed at 300 rpm (impeller linear velocity approximately 1.5 m / s) for 35 minutes. The mixture was then cooled to approximately 30°C at a cooling rate of 2°C / min. Cyanide leaching was then carried out for 48 hours under the conditions of pH 10.5, NaCN 1.2 kg / t, and activated carbon 40 g / L. The experimental results showed that the gold leaching recovery rate was 79.8%, the adsorption efficiency of activated carbon after 2 weeks of use was still 92% of that of fresh carbon, and the liquid phase gold loss was 0.08 mg / L.

[0096] Under the same process conditions, without the addition of a shielding agent, the experimental results were as follows: the gold leaching recovery rate was 74.5%, the adsorption efficiency of activated carbon after 2 weeks of use was about 95% of that of fresh carbon, and the liquid phase gold loss was 0.07 mg / L.

[0097] Compared with the method without a shielding agent, the shielding method in this embodiment increases the gold leaching recovery rate by 5.3 percentage points, while maintaining similar activated carbon adsorption efficiency and liquid phase gold loss. This indicates that the shielding method in this embodiment effectively improves the gold recovery rate while having virtually no adverse effect on the performance of activated carbon.

[0098] Table 3 Comparison of experimental results in Example 3 with and without shielding agent Example 4 The sample was taken from the Kalin-type gold ore flotation concentrate from the Saipan mine in Laos, with a gold grade of 7.4 g / t and an organic carbon content of 1.32%. 80 =75μm, SSA=105 m 2 / g. The slurry after high-temperature oxidation was maintained at approximately 80°C. Paraffin wax No. 52, with a melting point of 52°C, was added at a rate of 1.0 kg / t. The stirring time was then calculated to be approximately 33 minutes, but in practice, it was stirred at 300 rpm (impeller linear velocity approximately 1.5 m / s) for 35 minutes, and cooled to approximately 35°C at a cooling rate of 2°C / min. Cyanide leaching was then carried out for 48 hours under the conditions of pH 10.5, NaCN 1.2 kg / t, and activated carbon 40 g / L. The experimental results showed that the gold leaching recovery rate was 82.3%, the adsorption efficiency of activated carbon after 2 weeks of use was still 94% of that of fresh carbon, and the liquid phase gold loss was 0.1 mg / L.

[0099] Under the same process conditions, without the addition of a shielding agent, the experimental results were as follows: the gold leaching recovery rate was 76.4%, the adsorption efficiency of activated carbon after 2 weeks of use was about 96% of that of fresh carbon, and the liquid phase gold loss was 0.06 mg / L.

[0100] Compared with the method without a shielding agent, the shielding method in this embodiment increases the gold leaching recovery rate by 5.9 percentage points, while maintaining similar activated carbon adsorption efficiency and liquid phase gold loss. This indicates that the shielding method in this embodiment effectively improves the gold leaching recovery rate without significantly affecting the performance of activated carbon.

[0101] Table 4 Comparison of experimental results in Example 4 with and without shielding agent Example 5 The sample was taken from the Kalin-type gold ore flotation concentrate from the Saipan mine in Laos, with a gold grade of 8.1 g / t, organic carbon of 1.60%, and d... 80 =60μm, SSA=110 m 2 / g. The ore slurry after high-temperature oxidation was maintained at approximately 75°C, and No. 68 paraffin wax with a melting point of 69°C was added at a rate of 1.5 kg / t. The stirring time was calculated to be approximately 47 minutes according to the formula, but in practice, it was stirred at 300 rpm (impeller linear velocity approximately 1.5 m / s) for 50 minutes. The mixture was then cooled to 30°C at a cooling rate of 2°C / min. Subsequently, cyanide leaching was carried out for 48 hours under the conditions of pH 10.5, NaCN 1.2 kg / t, and activated carbon 40 g / L. Experimental results showed that the gold leaching recovery rate was 85.1%, the adsorption efficiency of activated carbon after 2 weeks of use was still 93% of that of fresh carbon, and the liquid phase gold loss was 0.09 mg / L.

[0102] Under the same process conditions, without the addition of a shielding agent, the experimental results were as follows: the gold leaching recovery rate was 74.0%, the adsorption efficiency of activated carbon after 2 weeks of use was about 97% of that of fresh carbon, and the liquid phase gold loss was 0.06 mg / L.

[0103] Compared with the method without a shielding agent, the shielding method in this embodiment increases the gold leaching recovery rate by 11.1 percentage points, while maintaining similar activated carbon adsorption efficiency and liquid phase gold loss. This indicates that the shielding method in this embodiment significantly improves the gold leaching recovery rate while having virtually no adverse effect on the performance of activated carbon.

[0104] Table 5 Comparison of experimental results in Example 5 with and without shielding agent Example 6 The sample was taken from the Kalin-type gold ore flotation concentrate from the Saipan mine in Laos, with a gold grade of 6.5 g / t, organic carbon of 1.10%, and d... 80 =90μm, SSA=70m 2 / g. The bio-oxidized slurry was heated to approximately 50°C, and lauric acid with a melting point of 44°C was added at a rate of 1.2 kg / t. The calculated stirring time was approximately 29.5 minutes, but in practice, stirring was performed at 300 rpm (impeller linear velocity approximately 1.5 m / s) for 30 minutes, followed by cooling to 30°C at a cooling rate of 1.5°C / min. Cyanide leaching was then carried out for 48 hours under conditions of pH 10.5, NaCN 1.2 kg / t, and activated carbon 40 g / L. Experimental results showed that the gold leaching recovery rate was 81.5%, the adsorption efficiency of activated carbon after 2 weeks of use was still 92% of that of fresh carbon, and the liquid phase gold loss was 0.1 mg / L.

[0105] Under the same process conditions, without the addition of a shielding agent, the experimental results were as follows: the gold leaching recovery rate was 73.8%, the adsorption efficiency of activated carbon after 2 weeks of use was about 95% of that of fresh carbon, and the liquid phase gold loss was about 0.07 mg / L.

[0106] Compared with the method without a shielding agent, the shielding method in this embodiment increases the gold leaching recovery rate by 7.7 percentage points, while maintaining similar activated carbon adsorption efficiency and liquid phase gold loss. This indicates that the shielding method in this embodiment effectively improves the gold leaching recovery rate without significantly affecting the performance of activated carbon.

[0107] Table 6 Comparison of experimental results in Example 6 with and without shielding agent Comparative Example 1 Using the same sample as in Example 4, the temperature of the oxidized slurry was lowered to approximately 25°C (the process temperature for conventional liquid shielding agents). Kerosene (with a melting point typically above -40°C) was added at a rate of 5.5 kg / t. After stirring at 300 rpm (impeller linear velocity approximately 1.5 m / s) for 30 minutes, cyanide leaching was carried out directly under the conditions of pH 10.5, NaCN 1.2 kg / t, and activated carbon 40 g / L for 48 hours. The adsorption efficiency of the activated carbon was monitored after two weeks of continuous use. The experimental results showed that the gold leaching recovery rate was 79.0%. After two weeks of use, the adsorption efficiency of the activated carbon decreased to 62% of that of fresh carbon, with a liquid-phase gold loss of 0.42 mg / L.

[0108] Using the same sample and process conditions, without adding any shielding agent, the experimental results were as follows: the gold leaching recovery rate was 76.4%, the adsorption efficiency of activated carbon after 2 weeks of use was about 96% of that of fresh carbon, and the liquid phase gold loss was 0.06 mg / L.

[0109] Compared to the method without a shielding agent, the shielding method in this comparative example improved the gold leaching recovery rate by 2.6 percentage points. However, the adsorption efficiency of activated carbon dropped sharply after two weeks of use (from 96% to 62%), and the liquid phase gold loss increased significantly (from 0.06 mg / L to 0.42 mg / L). This indicates that although kerosene has a certain organic carbon shielding effect in the existing technology, it can lead to severe poisoning of activated carbon, resulting in poor long-term economic efficiency. In addition, the amount of kerosene added (5.5 kg / t) is much higher than the amount of No. 52 paraffin added in Example 4 (1.0 kg / t).

[0110] Table 7 Comparison of experimental results between Comparative Example 1 with and without shielding agent Comparative Example 2 Using the same sample as Comparative Example 1, the temperature of the oxidized slurry was lowered to approximately 25°C (the process temperature for conventional liquid shielding agents). Diesel fuel (with a melting point typically of -18°C) was added at a rate of 7.0 kg / t. After stirring at 300 rpm (impeller linear velocity approximately 1.5 m / s) for 30 minutes, cyanide leaching was carried out directly under the conditions of pH 10.5, NaCN 1.2 kg / t, and activated carbon 40 g / L for 48 hours. The adsorption efficiency of the activated carbon was monitored after two weeks of continuous use. The experimental results showed that the initial gold leaching recovery rate was 78.5%. After two weeks of use, the adsorption efficiency of the activated carbon decreased to 58% of that of fresh carbon, with a liquid phase gold loss of 0.48 mg / L.

[0111] Using the same sample and process conditions, without adding any shielding agent, the experimental results were as follows: the gold leaching recovery rate was 76.4%, the adsorption efficiency of activated carbon after 2 weeks of use was about 96% of that of fresh carbon, and the liquid phase gold loss was 0.06 mg / L.

[0112] Compared to the method without a shielding agent, the shielding method in this comparative example improved the gold leaching recovery rate by 2.1 percentage points. However, the adsorption efficiency of activated carbon dropped sharply after two weeks of use (from 96% to 58%), and the liquid phase gold loss increased significantly (from 0.06 mg / L to 0.48 mg / L). This indicates that although diesel fuel has a certain organic carbon shielding effect in the existing technology, it can lead to severe poisoning of activated carbon, resulting in poor long-term economic efficiency. In addition, the amount of diesel fuel added (7.0 kg / t) is much higher than the amount of No. 52 paraffin wax added in Example 4 (1.0 kg / t).

[0113] Table 8 Comparison of experimental results between Comparative Example 2 with and without shielding agent The above description is merely a preferred embodiment of the present invention. Those skilled in the art should understand that the scope of disclosure in this invention is not limited to the specific combination of the above-described technical features, but should also cover other technical solutions formed by any combination of the above-described technical features or their equivalents without departing from the above-described concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this invention.

Claims

1. A method for shielding organic carbon in gold ore, characterized in that, Includes the following steps: By utilizing the residual heat from the oxidation treatment of the slurry, the temperature of the gold ore slurry containing organic carbon is maintained within a first predetermined temperature range. A hydrophobic organic compound that is solid at room temperature is added to the slurry as an organic carbon shielding agent; wherein the temperature of the slurry is not lower than the melting point of the hydrophobic organic compound. The slurry containing the hydrophobic organic material is stirred for a predetermined time so that the hydrophobic organic material melts into a liquid state at the temperature of the slurry and is adsorbed onto the surface of the organic carbon particles. The temperature of the stirred slurry is reduced to below the melting point of the hydrophobic organic matter at a predetermined cooling rate, causing the liquid hydrophobic organic matter adsorbed on the surface of the organic carbon particles to re-solidify and form a solid film covering the surface of the organic carbon particles.

2. The method for shielding organic carbon in gold ore according to claim 1, characterized in that, Also includes: The amount of the hydrophobic organic compound added is determined according to the following formula: ； ； ； in, This indicates the amount of hydrophobic organic matter added, expressed in kg / ton of ore; Represents the empirical coefficient. This indicates the mass of shielding agent required per unit area, in g / m². 2 ; This indicates the mass percentage of organic carbon in the ore; The specific surface area of ​​organic carbon is expressed in m². 2 / g.

3. The method for shielding organic carbon in gold ore according to claim 1, characterized in that, Also includes: The stirring time for the slurry with the added organic carbon shielding agent is determined according to the following formula: in, Indicates mixing time, in minutes; This indicates the particle size corresponding to a cumulative percentage of solid particles passing through the sieve when the total percentage reaches 80%, expressed in micrometers. This indicates the amount of organic carbon shielding agent added, expressed in kg / ton of ore. This is a proportionality coefficient, with a value ranging from 2000 to 3000; The particle size influence index ranges from 0.8 to 1.

2. The value ranges from 0.2 to 0.5, representing the influence of the amount added.

4. The method for shielding organic carbon in gold ore according to claim 1, characterized in that, The hydrophobic organic compound is selected from one or more of fatty acids, fatty acid esters, fatty alcohols, alkylphenols, polyolefins and alkanes; or, the hydrophobic organic compound is selected from one or more of mineral waxes, animal and plant waxes and synthetic waxes.

5. A method for shielding organic carbon in gold ore according to claim 4, characterized in that, The hydrophobic organic compound incorporates at least one functional group selected from carboxyl, hydroxyl, and epoxy groups into its molecular structure.

6. A method for shielding organic carbon in gold ore according to claim 1, characterized in that, The predetermined cooling rate is 0.5~5℃ / minute.

7. A method for shielding organic carbon in gold ore according to claim 6, characterized in that, The predetermined cooling rate is 1-3°C / minute.

8. A method for shielding organic carbon in gold ore according to claim 6, characterized in that, The slurry is cooled by natural cooling, stirring, or heat exchange.

9. A method for shielding organic carbon in gold ore according to claim 1, characterized in that, The first predetermined temperature range is 42℃-95℃.

10. A method for shielding organic carbon in gold ore according to claim 8, characterized in that, The melting point of the hydrophobic organic compound is 40℃-85℃.

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