Fire assay method for determining gold content in gold-containing resins

Abstract

This application provides a fire assay method for determining the gold content in gold-containing resin, belonging to the field of precious metal analysis and detection technology. Before fire assay analysis, the gold-containing resin is immersed in anhydrous ethanol. The anhydrous ethanol disrupts the cohesive force of the gold-containing resin, preventing splattering during the roasting stage. After immersion, the resin is transferred to a ceramic boat for staged roasting to ashing, eliminating the influence of particulate carbon on the subsequent fire assay analysis. Finally, the roasted resin is transferred to a clay crucible, where sodium carbonate, borax, lead oxide, silicon dioxide, and flour are added and stirred thoroughly. A covering agent is then applied, followed by melting, ash blowing, and gold separation to determine the gold content in the resin. This method achieves rapid and accurate determination of the gold content in gold-containing resin, improving the accuracy and stability of the detection results.

Description

Technical Field

[0001] This application relates to the field of precious metal analysis and testing technology, and in particular to a fire assay method for determining the gold content in gold-containing resin. Background Technology

[0002] In gold smelting and precious metal recovery, resin adsorption is commonly used to enrich and recover gold. Accurate determination of the gold content in the resin is crucial for evaluating its adsorption performance, calculating gold recovery rates, and controlling production quality. Currently, the fire assay method is the primary method for determining the gold content in gold-containing resins due to its advantages such as good enrichment effect, high detection accuracy, and wide applicability.

[0003] In existing technologies, there are two main methods for determining the gold content in gold-containing resins using fire assays: one method involves direct batching, melting, ash blowing, and gold separation to calculate the gold content. However, this method does not specifically treat the gold-containing resin. During the melting stage, the resin decomposes upon heating, producing a large number of carbon particles. These carbon particles adhere to the surface of the lead particles, hindering their movement within the melt. Consequently, some lead particles fail to aggregate into lead buckles and remain in the slag, making buckle forming difficult and resulting in lower test results. The other method involves pre-treating the sample with high-temperature calcination. However, gold-containing resins are high-carbon organic polymers. Direct high-temperature calcination causes the resin particles to aggregate tightly, preventing the timely release of trapped moisture, low-molecular-weight organic matter, and gases such as hydrocarbons and CO generated during pyrolysis. This leads to a sudden increase in internal pressure, resulting in violent splashing and deflagration, causing significant sample loss and cross-contamination.

[0004] Therefore, developing a fire assay method for determining the gold content in gold-containing resins that is simple to operate, efficient, minimizes gold loss, and has high detection accuracy has become an urgent technical need to be addressed in this field. Summary of the Invention

[0005] In view of the technical problems existing in the background art, this application provides a fire assay method for determining the gold content in gold-containing resin, aiming to solve the technical problems of easy splashing during the roasting of gold-containing resin, large gold loss, poor lead buckle molding, low measurement accuracy, cumbersome operation, and the inability of existing technologies to balance detection efficiency and accuracy.

[0006] To achieve the above objectives, this application provides a fire assay method for determining the gold content in gold-containing resin, comprising the following steps: S1, Soak m0g of gold-containing resin in anhydrous ethanol, remove the gold-containing resin and air dry it naturally; S2, the air-dried gold-containing resin is spread evenly in a ceramic boat with silica at the bottom, and subjected to segmented step-calcination to obtain gold-containing resin ash; the segmented step-calcination includes a pre-drying stage, a carbonization stage, and an ashing stage; the pre-drying stage is: heating to 200℃~250℃ and holding for 20min~25min; the carbonization stage is: heating from 200℃~250℃ to 350℃~400℃ and holding for 25min~30min; the ashing stage is: heating from 350℃~400℃ to 550℃~600℃ and holding for 35min~40min; S3, after the gold-containing resin ash residue is mixed evenly with the fire-testing flux, a layer of covering agent is applied, followed by melting, ash blowing and gold separation operations to obtain gold particles; S4, Calculate the gold content w in the gold-containing resin. Au : ; Among them, w Au m0 represents the gold content in the gold-containing resin (g / t), m0 represents the mass of the gold-containing resin (g), and m1 represents the mass of the gold particles (mg).

[0007] Furthermore, in step S2, the thickness of the gold-containing resin layer is ≤3mm.

[0008] Furthermore, in step S1, the gold-containing resin is soaked in anhydrous ethanol for 1-3 hours.

[0009] Furthermore, in step S3, the fire assay flux includes: 80g~100g lead oxide, 30g~40g sodium carbonate, 10g~15g borax, and 3g~4g flour.

[0010] Furthermore, in step S1, m0g is 5g-10g.

[0011] Furthermore, in step S3, the thickness of the covering agent is 5mm to 10mm; the covering agent is a mixture of sodium carbonate and borax in a mass ratio of 2:1 or 3:2.

[0012] Furthermore, the melting process includes the following steps: heating to 1100℃~1200℃ and holding at that temperature for 10min~15min.

[0013] Furthermore, the temperature for ash blowing is 880℃~900℃.

[0014] Furthermore, the gold separation operation includes the following process: the gold and silver granules obtained by ash blowing are hammered into thin sheets, and then subjected to gold separation treatment with nitric acid solution A and nitric acid solution B in sequence. After washing and drying, gold granules are obtained.

[0015] Furthermore, the nitric acid solution A is a mixed solution of nitric acid and water in a volume ratio of 1:7 or 1:8, and the nitric acid solution B is a mixed solution of nitric acid and water in a volume ratio of 1:1 or 1:2.

[0016] The beneficial effects of this application are: This application provides a fire assay method for determining the gold content in gold-containing resin. By immersing the gold-containing resin in anhydrous ethanol, the cohesive force of the gold-containing resin is destroyed. Combined with segmented step-calcination, the gold-containing resin is slowly pyrolyzed and degassed, avoiding particle aggregation and pressure buildup, eliminating splashing and deflagration during calcination, ensuring no gold loss, solving the problem of splashing during the calcination of gold-containing resin, and avoiding cross-contamination of samples.

[0017] In the existing technology, direct roasting is prone to splashing, low-temperature ashing has low efficiency, and strong oxidant pretreatment has hidden dangers, none of which can achieve the anti-splattering effect of this application.

[0018] This application employs a segmented, stepped calcination process to thoroughly oxidize and decompose the organic matter in the gold-containing resin, leaving no residual carbon. No carbon particles are generated during the melting stage, allowing the lead beads to smoothly aggregate into a complete and dense lead buckle, thus improving the gold collection efficiency. In the prior art, even when using the fire assay method to determine the gold in the gold-containing resin, residual carbon interference results in poor lead buckle formation and low gold collection efficiency.

[0019] In this application, gold loss is minimal, impurity interference is small, and the relative standard deviation of multiple parallel tests is ≤1%, meeting the accuracy requirements for gold content detection in gold-containing resins. This method surpasses the accuracy of existing fire assay methods for gold-containing resins and is simpler to operate.

[0020] In this application, the process of breaking cohesion with anhydrous ethanol, natural air drying, and segmented step calcination is simple and suitable for batch testing. Compared with the existing low-temperature ashing (4~6h) method, the efficiency is significantly improved. Compared with the wet decomposition + adsorption enrichment method, it is more suitable for the characteristics of gold-containing resin samples and is more convenient to operate.

[0021] Furthermore, anhydrous ethanol reagent is common and inexpensive, does not involve the use of highly toxic reagents, does not cause violent reactions during operation, is highly safe, and is suitable for routine laboratory operations. Compared with strong oxidant pretreatment, it reduces reagent costs and safety hazards. Compared with existing fire assay equipment improvement technology, it does not require additional equipment costs and is more practical. Attached Figure Description

[0022] Figure 1 This is a photograph of the gold-containing resin soaked in anhydrous ethanol in Example 1.

[0023] Figure 2 This is a photograph of the gold-containing resin before the segmented step calcination in Example 1.

[0024] Figure 3This is a photograph of the gold-containing resin ash obtained after segmented step calcination in Example 1. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] It should also be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and / or processing steps closely related to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0027] Additionally, it should be noted that the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0028] To address the technical problems of easy splashing, significant gold loss, poor lead buckle forming, and low measurement accuracy during the calcination of gold-containing resin, this application provides a fire assay method for determining the gold content in gold-containing resin. By immersing the gold-containing resin in anhydrous ethanol to disrupt its cohesion, combined with staged calcination to slowly pyrolyze and degas the resin, the technical effects of eliminating splashing, thorough ashing, and ensuring the forming of lead buckles can be achieved. Consequently, the accuracy and stability of the detection of gold content in the gold-containing resin are also improved.

[0029] This application provides a fire assay method for determining the gold content in gold-containing resin, comprising the following steps: S1, Soak m0g of gold-containing resin in anhydrous ethanol, remove the gold-containing resin and air dry it naturally; Among them, m0g is 5g-10g.

[0030] The gold-containing resin was soaked in anhydrous ethanol for 1-3 hours.

[0031] In this application, gold-containing resin is mixed with anhydrous ethanol. Anhydrous ethanol, as a dispersant, has extremely strong penetrability and can quickly wet the surface of gold-containing resin particles, breaking the agglomeration force inside the gold-containing resin particles and avoiding particle aggregation, suffocation, and splashing during subsequent calcination. At the same time, anhydrous ethanol is volatile and can be removed by natural air drying, without introducing impurities or interfering with subsequent calcination and fire assay analysis.

[0032] Furthermore, natural air drying removes anhydrous ethanol, avoiding premature softening and agglomeration of gold-containing resins caused by heating and drying, while also saving energy and simplifying operation.

[0033] S2, the air-dried gold-containing resin is spread evenly in a ceramic boat with silica at the bottom, and subjected to segmented step-calcination to obtain gold-containing resin ash; the segmented step-calcination includes a pre-drying stage, a carbonization stage, and an ashing stage; the pre-drying stage is: heating to 200℃~250℃ and holding for 20min~25min; the carbonization stage is: heating from 200℃~250℃ to 350℃~400℃ and holding for 25min~30min; the ashing stage is: heating from 350℃~400℃ to 550℃~600℃ and holding for 35min~40min; The thickness of the gold-containing resin layer is ≤3mm, which ensures that the gold-containing resin particles are heated evenly during subsequent firing, and that internal gases can be discharged in time, further preventing splashing.

[0034] In this application, the furnace door is kept slightly open during the pre-drying and carbonization stages to maintain ventilation and facilitate the timely discharge of gases generated by the pyrolysis of gold-containing resin, further preventing splashing; the furnace door is closed during the ashing stage to ensure sufficient oxidizing atmosphere and ensure that the carbon residue is completely ashed without any residual carbon.

[0035] S3, after uniformly mixing the gold-containing resin ash and fire-testing flux, a layer of covering agent is applied, followed by melting, ash blowing, and gold separation operations to obtain gold particles; The flux for fire assay includes: 80g~100g lead oxide, 30g~40g sodium carbonate, 10g~15g borax, and 3g~4g flour.

[0036] The melting process includes the following steps: heating to 1100℃~1200℃ and holding for 10min~15min.

[0037] During the ash blowing process, the preheating temperature of the ash pan is 950℃~1000℃, and the ash blowing temperature is 880℃~900℃.

[0038] The thickness of the covering agent is 5mm~10mm; the covering agent is a mixture of sodium carbonate and borax in a mass ratio of 2:1 or 3:2.

[0039] The gold separation process includes the following steps: the gold and silver granules obtained by ash blowing are hammered into thin sheets, and then subjected to gold separation treatment with nitric acid solution A and nitric acid solution B in sequence. After washing and drying, gold granules are obtained.

[0040] Nitric acid solution A is a mixed solution of nitric acid and water in a volume ratio of 1:7 or 1:8, and nitric acid solution B is a mixed solution of nitric acid and water in a volume ratio of 1:1 or 1:2.

[0041] In this application, the pretreated gold-containing resin ash residue has no residual carbon, and no particulate carbon is generated during the melting stage. The particulate carbon does not adhere to the surface of the lead particles, thus ensuring the free movement of the lead particles. At the same time, sodium carbonate and borax reduce the viscosity of the slag and promote the aggregation of lead beads into complete lead buckles. The control of melting temperature and holding time further ensures good slag fluidity and sufficient gold capture.

[0042] S4, Calculate the gold content w in the gold-containing resin. Au : ; Among them, w Au m0 represents the gold content in the gold-containing resin (g / t), m0 represents the mass of the gold-containing resin (g), and m1 represents the mass of the gold particles (mg).

[0043] The fire assay method for determining the gold content in gold-containing resin provided in this application involves immersing the gold-containing resin in anhydrous ethanol. The strong penetrability of anhydrous ethanol allows for rapid wetting of the surface of the gold-containing resin particles, breaking down the internal agglomeration of the gold-containing resin particles and preventing particle aggregation, suffocation, and splashing during subsequent roasting. At the same time, anhydrous ethanol is volatile and can be removed by natural air drying, without introducing impurities or interfering with subsequent roasting and fire assay analysis.

[0044] In this application, the air-dried gold-containing resin is spread evenly in a container and subjected to staged calcination. The pre-drying stage allows the gold-containing resin to slowly dehydrate; the carbonization stage completely carbonizes the resin into charcoal residue; and the ashing stage completely ashing the charcoal residue, leaving no residual carbon. During the pre-drying and carbonization stages, the furnace door is kept slightly open to facilitate timely gas exhaust and further prevent splashing. During the ashing stage, the furnace door is closed to ensure a sufficient oxidizing atmosphere and complete ashing of the charcoal residue.

[0045] The method for determining the gold content in gold-containing resins provided by the present invention will be described below with reference to specific embodiments.

[0046] Example 1 This embodiment provides a fire assay method for determining the gold content in gold-containing resin, comprising the following steps: S1, gold-containing resin dispersion treatment: Weigh 10.00 g of the gold-containing resin sample, accurate to 0.01 g, add 100 mL of anhydrous ethanol to fully disperse the gold-containing resin particles, and soak for 1 hour. Figure 1 As shown; then, the ethanol was poured off, and the sample was allowed to air dry naturally to remove residual ethanol, thus obtaining the treated gold-containing resin sample; S2, Sample pretreatment: The gold-containing resin sample processed in step S1 was transferred to a ceramic boat with 5g of silica at the bottom, spread evenly to a thickness of about 3mm, resulting in a flat, dispersed gold-containing resin sample, as shown in the image below. Figure 2As shown; Segmented stepped roasting: The porcelain ark containing the gold-containing resin sample was transferred to a melting furnace with the furnace door slightly ajar for staged firing. ① Pre-drying stage: Raise the temperature from room temperature to 200℃ and keep it at that temperature for 20 minutes; ② Carbonization stage: The temperature is increased from 200℃ to 350℃ and held for 25 minutes until the gold-containing resin is completely carbonized into carbon slag; ③ Ashing stage: The temperature is increased from 350℃ to 550℃ and held for 35 minutes until the carbon slag is completely ashed, yielding gold-containing resin ash slag. A physical image of the ash slag is shown below. Figure 3 As shown.

[0047] S3. Transfer the obtained gold-containing resin ash to a clay crucible, add a fire test flux (80g lead oxide, 30g sodium carbonate, 10g borax, and 4g flour) to the clay crucible, mix well, and then cover with a 10mm thick covering agent (a mixture of sodium carbonate and borax in a mass ratio of 2:1).

[0048] Melt treatment: Transfer the clay crucible to the melting furnace, slowly heat it to 1100℃, maintain the temperature for 10 minutes, rotate the clay crucible steadily several times, and gently tap the bottom of the crucible on an iron plate 2 to 3 times to ensure that the molten material gathers at the bottom of the crucible. Then pour all the molten material into a preheated cast iron mold. After cooling, separate the lead buckle from the slag, hammer the lead buckle into a cube, and weigh it.

[0049] Ash blowing treatment: The obtained lead buckle is placed in a magnesia ash pan that has been preheated in a 950℃ ash blowing furnace for 20 minutes. After the lead melts and the film is removed, the furnace door is partially opened and ash blowing is carried out at 880℃. After the lead is completely blown away, the gold and silver granules are taken out.

[0050] Gold splitting operation: Use a hammer to break the gold-silver granules into thin sheets with a thickness of 0.2 mm to 0.3 mm. Place the sheet in a colorimetric tube, add 10 mL of nitric acid solution A (a mixture of nitric acid and water in a volume ratio of 1:7), and heat the colorimetric tube in a water bath. After the reaction between the gold-silver granules and the acid has stopped, remove the colorimetric tube, pour off the acid, add 10 mL of gently boiling nitric acid solution B (a mixture of nitric acid and water in a volume ratio of 1:1), and continue heating in a boiling water bath for 40 min.

[0051] Remove the colorimetric tube, pour out the acid solution, wash the gold particles with distilled water, transfer them to a porcelain crucible, dry them on a hot plate and anneal them, cool them to room temperature, weigh the gold particles on a microbalance, and record the mass m1.

[0052] S4, Calculate the gold content w in the gold-containing resin. Au : The gold content in gold-containing resins can be calculated using the following formula: ; Among them, w Au m0 represents the gold content in the gold-containing resin (g / t), m0 represents the mass of the gold-containing resin (g), and m1 represents the mass of the gold particles (mg).

[0053] A gold-containing resin sample was selected, and a precision test was conducted according to the experimental steps of Example 1 to verify the stability of the test. Meanwhile, since there is currently a lack of standard samples of gold-containing resin, the spiked recovery method was used to verify the accuracy of the method provided in this example. The specific test results are shown in Tables 1 and 2.

[0054] Table 1 Table 2 As can be seen from the data in Tables 1 and 2, the precision of Example 1 is 0.07%, and the spiked recovery rate is 98.72%~100.1%, which proves that the fire assay method for determining the gold content in gold-containing resin provided in this example has high stability and accuracy.

[0055] Comparative Example 1 The difference from Example 1 is that, instead of anhydrous ethanol soaking and staged step calcination, the gold-containing resin was directly mixed with flux and then melted. Specifically: Step 1, Ingredients: Place the gold-containing resin in a clay crucible, add 80g of lead oxide, 30g of sodium carbonate, 10g of borax, 4g of flour, and 5g of silicon dioxide to the crucible, mix well, and then cover with a 10mm thick covering agent.

[0056] The processes of melting, blowing, and separating the gold are the same as in Example 1, and will not be repeated here.

[0057] The formula for calculating the gold content in the sample is the same as that in Example 1, and will not be repeated here.

[0058] The same gold-containing resin sample as in Example 1 was selected, and the gold content in the gold-containing resin was determined according to the determination method of Comparative Example 1. The results are shown in Table 3.

[0059] Table 3 The experimental phenomena show that during the roasting process of Comparative Example 1, the gold-containing resin splashed and exploded violently, and some gold-containing resin particles jumped out of the ceramic ark, resulting in serious gold loss. There was a lot of residual carbon in the melting stage, and some lead particles remained in the slag, which caused the lead buckle to not form properly, resulting in a lower result.

[0060] As can be seen from the data in Table 3, the detected gold content was 82.80 g / t, which deviates significantly from the true value in Example 1. The relative standard deviation of parallel detection was 1.64%, indicating poor precision. Comparative Example 1 simulates existing direct roasting technology, further demonstrating the necessity and superiority of the "anhydrous ethanol immersion + segmented step roasting" combination of this application.

[0061] Comparative Example 2 The difference from Example 1 is that no anhydrous ethanol soaking was performed, and constant temperature calcination (550°C for 1 hour) was used. Details are as follows: Step 1, Weigh the sample: Weigh 10.00g of gold-containing resin sample, accurate to 0.01g, and place the gold-containing resin sample in a ceramic boat with 5g of silica at the bottom. Spread it evenly to a thickness of about 3mm to obtain a flat and dispersed gold-containing resin sample.

[0062] Step 2, roasting: The ceramic ark from step 1 was transferred to a melting furnace and calcined at 550°C for 1 hour to obtain gold-containing resin ash.

[0063] Step 3, Ingredients: Transfer the gold-containing resin ash obtained in step 2 to a clay crucible. Add 80g of lead oxide, 30g of sodium carbonate, 10g of borax, and 4g of flour to the clay crucible. Mix well and then cover with a 10mm thick covering agent.

[0064] The processes of melting, blowing, and separating the gold are the same as in Example 1, and will not be repeated here.

[0065] The formula for calculating the gold content in the sample is the same as that in Example 1, and will not be repeated here.

[0066] The same gold-containing resin sample as in Example 1 was selected, and the gold content in the gold-containing resin was determined according to the determination method of Comparative Example 2. The results are shown in Table 4.

[0067] Table 4 As can be seen from the data in Table 4, the average value of the eight results is 79.55 g / t, which is lower than the result measured in Example 1 and has poor precision. The reason for this phenomenon is that the gold-containing resin was violently splashed during direct calcination at 550°C, resulting in the loss of gold-containing resin particles, which in turn led to the lower result and poor precision.

[0068] Comparative Example 3 The difference from Example 1 is that segmented step calcination was not used; instead, constant temperature calcination (550°C constant temperature calcination for 1 hour) was used. Everything else is the same as in Example 1, and will not be repeated here.

[0069] The specific process of constant temperature roasting is as follows: Roasting: The porcelain ark containing the gold-containing resin sample was transferred to the melting furnace, the furnace door was slightly opened, and it was calcined at 550℃ for 1 hour to obtain gold-containing resin ash.

[0070] The same gold-containing resin sample as in Example 1 was selected, and the gold content in the gold-containing resin was determined according to the determination method of Comparative Example 3. The results are shown in Table 5.

[0071] Table 5 Observations of the experimental phenomena in Comparative Example 3 revealed that there was still slight splashing during the roasting process, the pyrolysis of the gold-containing resin produced intense gas production, and some gold was lost due to being carried away by the splashed gold-containing resin particles. As can be seen from the data in Table 5, the detection result is 86.30 g / t, and the relative standard deviation is 1.06%. The detection result and precision are still not as accurate and precise as the results of Example 1, which proves that the synergistic effect of "segmented step calcination" and anhydrous ethanol immersion is the key to achieving the technical effect of this application.

[0072] Example 2 The difference from Example 1 is that the grade of the gold-containing resin used is different; the grade of the gold-containing resin in Example 2 is 7.39 g / t, while the grade of the gold-containing resin in Example 1 is 87.67 g / t. Everything else is the same as in Example 1 and will not be repeated here.

[0073] Example 3 The difference from Example 1 is that the type of gold-containing resin used is different; the gold-containing resin of Example 1 is suitable for adsorbing gold under strongly acidic conditions, while the gold-containing resin of Example 3 is suitable for adsorbing gold under strongly alkaline conditions. Everything else is the same as in Example 1 and will not be repeated here.

[0074] Precision tests were conducted on Examples 2 and 3 to verify the stability of the experiments. At the same time, the accuracy of the method was verified by spike recovery. The specific test results are shown in Tables 6 and 7.

[0075] Table 6 Table 7 Results of spiked recovery tests As can be seen from the data in Tables 6 and 7, the precision of Examples 2 and 3 is 0.86% and 0.28%, respectively, and the spike recovery rates are 100.1% and 99.96%, respectively, further proving that the determination method provided in this application has accuracy and stability.

[0076] In summary, this application provides a method for determining the gold content in gold-containing resin. Before fire assay analysis, the gold-containing resin is immersed in anhydrous ethanol to break down its cohesive forces. After immersion, it is transferred to a ceramic boat for staged calcination to ashed the resin and eliminate the influence of particulate carbon on the subsequent fire assay analysis. Finally, the calcined resin is transferred to a clay crucible, where sodium carbonate, borax, lead oxide, silicon dioxide, and flour are added and stirred until homogeneous. A covering agent is then applied, followed by melting, ash blowing, and gold separation to determine the gold content in the resin. This method achieves rapid and accurate determination of the gold content in gold-containing resin, improving the accuracy and stability of the test results.

[0077] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A fire assay method for determining the gold content in gold-containing resin, characterized in that, Includes the following steps: S1, Soak m0g of gold-containing resin in anhydrous ethanol, remove the gold-containing resin and air dry it naturally; S2, the air-dried gold-containing resin is spread evenly in a ceramic boat with silica at the bottom, and subjected to segmented step-calcination to obtain gold-containing resin ash; the segmented step-calcination includes a pre-drying stage, a carbonization stage, and an ashing stage; the pre-drying stage is: heating to 200℃~250℃ and holding for 20min~25min; the carbonization stage is: heating from 200℃~250℃ to 350℃~400℃ and holding for 25min~30min; the ashing stage is: heating from 350℃~400℃ to 550℃~600℃ and holding for 35min~40min; S3, after the gold-containing resin ash residue is mixed evenly with the fire-testing flux, a layer of covering agent is applied, followed by melting, ash blowing and gold separation operations to obtain gold particles; S4, Calculate the gold content w in the gold-containing resin. Au : ； Among them, w Au m0 represents the gold content in the gold-containing resin (g / t), m0 represents the mass of the gold-containing resin (g), and m1 represents the mass of the gold particles (mg).

2. The fire assay method for determining the gold content in gold-containing resin according to claim 1, characterized in that: In step S2, the thickness of the gold-containing resin layer is ≤3mm.

3. The fire assay method for determining the gold content in gold-containing resin according to claim 1, characterized in that: In step S1, the gold-containing resin is soaked in anhydrous ethanol for 1-3 hours.

4. The fire assay method for determining the gold content in gold-containing resin according to claim 1, characterized in that, In step S3, the flux for fire assay includes: 80g~100g lead oxide, 30g~40g sodium carbonate, 10g~15g borax, and 3g~4g flour.

5. The fire assay method for determining the gold content in gold-containing resin according to claim 1, characterized in that: In step S1, m0g is 5g-10g.

6. The fire assay method for determining the gold content in gold-containing resin according to claim 1, characterized in that: In step S3, the thickness of the covering agent is 5mm to 10mm; the covering agent is a mixture of sodium carbonate and borax in a mass ratio of 2:1 or 3:

2.

7. The fire assay method for determining the gold content in gold-containing resin according to claim 1, characterized in that, The melting process includes the following steps: heating to 1100℃~1200℃ and holding for 10min~15min.

8. The fire assay method for determining the gold content in gold-containing resin according to claim 1, characterized in that: The temperature for ash blowing is 880℃~900℃.

9. The fire assay method for determining the gold content in gold-containing resin according to claim 1, characterized in that, The gold separation process includes the following steps: the gold and silver granules obtained by ash blowing are hammered into thin sheets, and then subjected to gold separation treatment with nitric acid solution A and nitric acid solution B in sequence. After washing and drying, gold granules are obtained.

10. The fire assay method for determining the gold content in gold-containing resin according to claim 9, characterized in that: The nitric acid solution A is a mixed solution of nitric acid and water in a volume ratio of 1:7 or 1:8, and the nitric acid solution B is a mixed solution of nitric acid and water in a volume ratio of 1:1 or 1:2.

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