Leaching method of antimony-containing refractory gold ore

Abstract

The invention relates to the technical field of mineral processing, and provides an antimony-containing refractory gold ore leaching method which comprises the steps that antimony-containing refractory gold ore is ground, and dissociated minerals are obtained; the dissociated minerals are subjected to oxidizing roasting, and pretreated roasted sand is obtained; antimony leaching is conducted on the pretreated calcine through an antimony leaching agent, and antimony-containing leachate and gold-containing leaching residues are obtained; and carbon slurry leaching is conducted on the gold-containing leaching residues through a gold leaching agent and activated carbon, and gold leaching mother liquor, gold-loaded carbon particles and final leaching residues are obtained. According to the leaching method provided by the invention, at least high-efficiency leaching of gold and antimony in the antimony-containing refractory gold ore can be achieved, so that the effect of cooperative utilization of gold and antimony is achieved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of mineral processing, for example, to a leaching method for antimony-containing refractory gold ore. Background Art

[0002] China's gold resource dependence on foreign countries has reached about 60%, and its reserves and scale cannot be compared with those of foreign gold mines. In China, gold mines are mainly small and medium-sized, with poor endowments, and there are deficiencies such as a small number of gold resources, a high proportion of difficult-to-process gold mines, and low resource utilization, which has caused serious waste of gold resources. Therefore, improving the comprehensive utilization and recovery level of gold resources and reducing the external dependence on gold resources are urgent issues that need to be solved for the development of China's gold mining industry.

[0003] Common difficult-to-process gold ores generally have the characteristics of high carbon, high sulfur and high arsenic, so the leaching rate of direct gold leaching is very low; at the same time, some gold mines are also accompanied by certain antimony resources, so the synergistic utilization of gold and antimony in complex and difficult-to-process antimony-containing gold ore resources is of great significance.

[0004] In this regard, Chinese patent document CN201610902405.3 discloses a pretreatment method for antimony- and arsenic-containing refractory gold ore, which comprises: (1) crushing and ball-milling the antimony- and arsenic-containing refractory gold ore to prepare a powder; (2) adding the powder obtained in step (1) into a closed vertical tube heating furnace, introducing a neutral protective gas, roasting, cooling, and obtaining roasted sand, the generated tail gas enters a tail gas collection device, and the collected smoke is leached with a mixed solution of Na2S with a concentration of 50 to 200 g / L and NaOH with a concentration of 20 to 100 g / L, and then solid-liquid separation is performed to obtain arsenic-containing filter residue and antimony-containing leachate, and the leachate is electrolytically produced to produce metallic antimony. The method provided in the patent document adopts neutral protective gas roasting, so that the antimony in the antimony- and arsenic-containing refractory gold ore is volatilized as antimony sulfide and separated from the gold ore, and arsenic and antimony are removed simultaneously, and the removal rate of antimony can reach more than 99%, and the removal rate of arsenic can reach more than 98%. However, although the method provided in the patent document can efficiently remove antimony and arsenic, it has not yet involved a technical solution that can efficiently leach gold and antimony from antimony-containing difficult-to-treat gold ores to achieve synergistic utilization of gold and antimony.

[0005] In summary, there is an urgent need for a leaching method for antimony-containing refractory gold ore, so that it can at least efficiently leach gold and antimony in the antimony-containing refractory gold ore, thereby achieving the synergistic utilization of gold and antimony. Summary of the invention

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a leaching method for antimony-containing refractory gold ore, so as to at least achieve efficient leaching of gold and antimony in the antimony-containing refractory gold ore, thereby realizing the effect of synergistic utilization of gold and antimony.

[0007] The purpose of this disclosure is achieved through the following technical solutions:

[0008] On the one hand, a leaching method for antimony-containing refractory gold ore is provided. The leaching method comprises: grinding the antimony-containing refractory gold ore to obtain dissociated ore; oxidative roasting the dissociated ore to obtain pre-treated roasted sand; using an antimony leaching agent to leach antimony from the pre-treated roasted sand to obtain an antimony-containing leaching solution and gold-containing leaching residue; and using a gold leaching agent and activated carbon to perform carbon slurry leaching on the gold-containing leaching residue to obtain a gold leaching mother solution, gold-loaded carbon particles, and final leaching residue.

[0009] It should be understood that the treatment methods of the antimony-containing leaching solution, the gold leaching mother solution, the gold-loaded carbon particles and the final leaching residue obtained in the leaching method provided in the present disclosure can be selected according to actual needs, and the present disclosure does not limit this.

[0010] In some examples, the antimony-containing leachate can be used to prepare an antimony product.

[0011] In some examples, the gold leaching solution can be returned to the carbon slurry leaching.

[0012] In some examples, the gold-loaded carbon particles can be used to recover gold.

[0013] In some examples, the final leaching residue can be stored, landfilled, or used as auxiliary building materials.

[0014] In some of the above embodiments, the leaching method provided by the present disclosure is aimed at antimony-containing difficult-to-treat gold ore. By adopting the method of "oxidation roasting-antimony leaching-carbon slurry leaching", gold and antimony can be leached step by step and efficiently from the antimony-containing difficult-to-treat gold ore, and the leaching rates of gold and antimony are not less than 96.5% and 98.5%, respectively, thereby achieving efficient utilization of gold and antimony in antimony-containing difficult-to-treat gold ore, and also solving the problem of separation and extraction of antimony-containing difficult-to-treat gold ore.

[0015] In some embodiments, the oxidative roasting includes suspension roasting.

[0016] In some of the above embodiments, suspension roasting can not only improve the mineral activation efficiency but also reduce energy consumption, and it is also easy to collect and process the generated tail gas.

[0017] In some embodiments, the oxidative calcination includes a first stage calcination and a second stage calcination.

[0018] In some embodiments, the calcination atmosphere of the first calcination is a low oxygen atmosphere, the calcination temperature of the first calcination is 450-500° C., and the calcination time of the first calcination is 5-30 min.

[0019] In some examples, the oxygen content in the low-oxygen atmosphere is 5% to 21%.

[0020] It should be noted that the first stage calcination in a low oxygen atmosphere can achieve the effect of arsenic removal.

[0021] In some embodiments, the calcination atmosphere of the second calcination is an oxygen-rich atmosphere, the calcination temperature of the second calcination is 600-700° C., and the calcination time of the second calcination is 15-60 min.

[0022] In some examples, the oxygen content in the oxygen-rich atmosphere is 30% to 60%.

[0023] It should be noted that the second stage roasting in an oxygen-rich atmosphere can achieve the effects of desulfurization and decarbonization.

[0024] In some of the above embodiments, by performing two-stage oxidative roasting (for example, two-stage suspended roasting), not only can the pretreatment efficiency of antimony-containing difficult-to-treat gold ore be improved, thereby shortening the pretreatment time of antimony-containing difficult-to-treat gold ore, but also the gold and antimony minerals can be activated, thereby facilitating the subsequent extraction of gold and antimony resources.

[0025] In some embodiments, the antimony leaching is performed under the assistance of a first microwave; wherein the power of the first microwave assistance is 0.5-3 kW.

[0026] In some of the above embodiments, by performing antimony leaching under the assistance of the first microwave, not only the leaching rate of antimony can be effectively improved, but also the gold minerals can be further activated; in addition, the alkaline substances remaining in the gold-containing leaching residue obtained by antimony leaching can also provide an alkaline environment for carbon slurry leaching (i.e., gold leaching).

[0027] In some embodiments, the leaching temperature of the antimony leaching is 80-100° C., and the leaching time of the antimony leaching is 30-120 min.

[0028] In some examples, the antimony leaching has a leachate-to-solid ratio of 4:1.

[0029] In some examples, the antimony leaching agent includes sodium sulfide and sodium hydroxide.

[0030] Exemplarily, the concentration of sodium sulfide is 30 to 200 g / L.

[0031] Exemplarily, the concentration of sodium hydroxide is 30-200 g / L.

[0032] In some embodiments, the carbon slurry leaching is performed under the assistance of a second microwave; wherein the power of the second microwave assistance is 0.5 to 3 kW.

[0033] In some of the above embodiments, by performing carbon slurry leaching (ie, gold leaching) under the assistance of the second microwave, not only the gold leaching rate can be further improved, but also the gold leaching time can be shortened.

[0034] In some embodiments, the leaching pH of the carbon slurry leaching is 10-11, the leaching temperature of the carbon slurry leaching is 30-60° C., and the leaching time of the carbon slurry leaching is 60-180 min.

[0035] In some examples, the bottom carbon concentration of the carbon slurry leached is 5 to 30 g / L.

[0036] In some examples, the activated carbon includes at least one of coconut shell charcoal and apricot shell charcoal.

[0037] In some examples, the gold leaching agent includes sodium cyanide.

[0038] In some examples, the dosage of the gold leaching agent is 2-5 kg / t·feed ore.

[0039] In some embodiments, the mass percentage of minerals with a particle size of -0.074 mm in the dissociated minerals is greater than or equal to 95%.

[0040] In some embodiments, in the antimony-containing refractory gold ore, the grade of Au is 2-10 g / t, the grade of Sb is 0.3%-2.0%, the grade of As is 0.5%-3.0%, and the grade of S is 2.5%-10.5%.

[0041] It should be noted that the leaching method provided in the present disclosure is targeted at the antimony-containing difficult-to-process gold ore, which not only has the characteristics of high sulfur (S) and high arsenic (As), but also has low content of gold (Au) and antimony (Sb).

[0042] The beneficial effects of the present disclosure are:

[0043] The present invention provides a leaching method for antimony-containing difficult-to-treat gold ore. For antimony-containing difficult-to-treat gold ore, by adopting the method of "oxidation roasting-antimony leaching-carbon slurry leaching", gold and antimony can be leached from the antimony-containing difficult-to-treat gold ore step by step and efficiently, and the leaching rates of gold and antimony are not less than 95.5% and 97.5%, respectively, thereby achieving efficient utilization of gold and antimony in the antimony-containing difficult-to-treat gold ore, and also solving the problem of separation and extraction of antimony-containing difficult-to-treat gold ore. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the present disclosure, the following briefly introduces the drawings required to be used in some embodiments of the present disclosure. Obviously, the drawings described below are only drawings of some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can also be obtained based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams, and are not limitations on the actual process of the method involved in the embodiments of the present disclosure.

[0045] Figure 1 The present invention provides a process flow chart of a leaching method for antimony-containing refractory gold ore. DETAILED DESCRIPTION

[0046] The technical solutions in some embodiments of the present disclosure are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments provided by the present disclosure, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present disclosure.

[0047] Unless the context requires otherwise, throughout the specification and claims, the term "comprising" is to be construed in an open, inclusive sense, ie, meaning "including, but not limited to."

[0048] In the following, the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features.

[0049] When describing some embodiments, the expression "A and / or B" may be used. It is easy to understand that "A and / or B" includes the following three combinations: only A, only B, and a combination of A and B.

[0050] When describing some embodiments, the expressions "at least one of A, B and C" and "at least one of A, B or C" may be used, both of which have the same meaning and include the following combinations of A, B and C: A only, B only, C only, the combination of A and B, the combination of A and C, the combination of B and C, and the combination of A, B and C.

[0051] Example 1

[0052] This embodiment provides a leaching method for antimony-containing refractory gold ore. The ore dressing concentrate of a high-arsenic antimony-containing refractory gold ore in Xinjiang was selected as the feed ore for the experiment. The main chemical components of the ore dressing concentrate were shown in Table 1 after testing.

[0053] Table 1 Analysis results of main chemical components of feed ore

[0054] Components <![CDATA[Na2O]]> MgO <![CDATA[Al2O3]]> <![CDATA[SiO2]]> <![CDATA[P2O5]]> S <![CDATA[K2O]]> content 0.294％ 1.201％ 14.328％ 46.033％ 0.150％ 10.470％ 3.216％ Components CaO <![CDATA[TiO2]]> Fe As Sb Au* content 2.212％ 0.886％ 11.618％ 2.91％ 0.47％ 8.42g / t

[0055] The main process of the leaching method is as follows Figure 1 As shown, the leaching method includes S1 to S4.

[0056] S1. Grinding the feed ore to obtain dissociated ore, wherein the mass percentage of ore with a particle size of -0.074 mm is greater than or equal to 95%.

[0057] S2. The dissociated mineral is sent to a suspension roasting furnace for two-stage oxidation roasting (ie, the two-stage oxidation roasting is two-stage suspension roasting) to obtain pretreated roasted sand.

[0058] Among them, the oxidative roasting includes a first stage roasting and a second stage roasting; the roasting atmosphere of the first stage roasting is a low-oxygen atmosphere (the oxygen content is 10%), the roasting temperature is 500°C, and the roasting time is 30 minutes; the roasting atmosphere of the second stage roasting is an oxygen-rich atmosphere (the oxygen content is 50%), the roasting temperature is 700°C, and the roasting time is 60 minutes.

[0059] S3. Antimony is leached from the pretreated roasted sand using an antimony leaching agent under microwave assistance to obtain an antimony-containing leaching solution and a gold-containing leaching residue, the antimony leaching rate is 98.87%, the antimony-containing leaching solution is used to prepare an antimony product, and the gold-containing leaching residue is used in subsequent steps.

[0060] Among them, the power of microwave assistance is 3kW; the leaching temperature of antimony leaching is 95°C, the leaching time is 120min, and the liquid-solid ratio is 4:1; the antimony leaching agent is a compound of sodium sulfide and sodium hydroxide, the concentration of sodium sulfide is 30g / L, and the concentration of sodium hydroxide is 120g / L.

[0061] S4. The gold-containing leaching residue is subjected to carbon slurry leaching with the assistance of a gold leaching agent and activated carbon under microwave assistance to obtain a gold leaching mother liquor, gold-loaded carbon particles and final leaching residue, with a gold leaching rate of 96.57%. The gold leaching mother liquor is returned to the carbon slurry leaching step, the gold-loaded carbon particles are used to recover the gold element, and the final leaching residue is stored, landfilled or used as an auxiliary building material.

[0062] Among them, the power of microwave assistance is 3kW; the leaching pH of carbon slurry leaching is 11, the leaching temperature is 30°C, the leaching time is 180min, and the bottom carbon concentration is 30g / L; the activated carbon is coconut shell carbon; the gold leaching agent is sodium cyanide, and the dosage is 3kg / t·feed ore.

[0063] Example 2

[0064] This embodiment provides a leaching method for antimony-containing refractory gold ore. A high-arsenic antimony-containing refractory gold ore in Xinjiang was selected as the feed ore for the experiment. The main chemical components of the gold ore were tested as shown in Table 2.

[0065] Table 2 Analysis results of main chemical components of the ore

[0066] Components <![CDATA[Na2O]]> MgO <![CDATA[Al2O3]]> <![CDATA[SiO2]]> <![CDATA[P2O5]]> S <![CDATA[K2O]]> content 0.387％ 1.463％ 13.993％ 60.557％ 0.158％ 2.594％ 3.096％ Components CaO <![CDATA[TiO2]]> Fe As Sb Au* content 3.070％ 0.638％ 4.261％ 0.783％ 0.32％ 2.34g / t

[0067] The main process of the leaching method is as follows Figure 1 As shown, the leaching method includes S1 to S4.

[0068] S1. Grinding the feed ore to obtain dissociated ore, wherein the mass percentage of ore with a particle size of -0.074 mm is greater than or equal to 95%.

[0069] S2. The dissociated mineral is sent to a suspension roasting furnace for two-stage oxidation roasting (ie, the two-stage oxidation roasting is two-stage suspension roasting) to obtain pretreated roasted sand.

[0070] Among them, the oxidative roasting includes a first stage roasting and a second stage roasting; the roasting atmosphere of the first stage roasting is a low-oxygen atmosphere (the oxygen content is 5%), the roasting temperature is 450°C, and the roasting time is 5 minutes; the roasting atmosphere of the second stage roasting is an oxygen-rich atmosphere (the oxygen content is 60%), the roasting temperature is 600°C, and the roasting time is 30 minutes.

[0071] S3. Antimony is leached from the pretreated roasted sand using an antimony leaching agent under microwave assistance to obtain an antimony-containing leaching solution and a gold-containing leaching residue, the antimony leaching rate is 97.86%, the antimony-containing leaching solution is used to prepare an antimony product, and the gold-containing leaching residue is used in subsequent steps.

[0072] Among them, the power of microwave assistance is 0.5kW; the leaching temperature of antimony leaching is 100°C, the leaching time is 30min, and the liquid-solid ratio is 4:1; the antimony leaching agent is a compound of sodium sulfide and sodium hydroxide, the concentration of sodium sulfide is 200g / L, and the concentration of sodium hydroxide is 30g / L.

[0073] S4. The gold-containing leaching residue is subjected to carbon slurry leaching with the assistance of a gold leaching agent and activated carbon under microwave assistance to obtain a gold leaching mother liquor, gold-loaded carbon particles and final leaching residue, with a gold leaching rate of 95.70%. The gold leaching mother liquor is returned to the carbon slurry leaching step, the gold-loaded carbon particles are used to recover the gold element, and the final leaching residue is stored, landfilled or used as an auxiliary building material.

[0074] Among them, the power of microwave assistance is 3.0kW; the leaching pH of carbon slurry leaching is 10, the leaching temperature is 60°C, the leaching time is 60min, and the bottom carbon concentration is 5g / L; the activated carbon is apricot shell carbon; the gold leaching agent is sodium cyanide, and the dosage is 5kg / t·feed ore.

[0075] Example 3

[0076] This embodiment provides a leaching method for antimony-containing refractory gold ore. A high-arsenic antimony-containing refractory gold ore in the northwest region is selected as the feed ore for the experiment. The main chemical components of the gold ore are shown in Table 3 after analysis.

[0077] Table 3 Analysis results of main chemical components of the ore

[0078] Components <![CDATA[Na2O]]> MgO <![CDATA[Al2O3]]> <![CDATA[SiO2]]> <![CDATA[P2O5]]> S <![CDATA[K2O]]> content 0.34％ 1.53％ 13.90％ 62.66％ 0.16％ 2.79％ 3.42％ Components CaO <![CDATA[TiO2]]> Fe As Sb Au* content 3.12％ 0.56％ 4.29％ 0.52％ 1.97％ 2.38g / t

[0079] The main process of the leaching method is as follows Figure 1 As shown, the leaching method includes S1 to S4.

[0080] S1. Grinding the feed ore to obtain dissociated ore, wherein the mass percentage of ore with a particle size of -0.074 mm is greater than or equal to 95%.

[0081] S2. The dissociated mineral is sent to a suspension roasting furnace for two-stage oxidation roasting (ie, the two-stage oxidation roasting is two-stage suspension roasting) to obtain pretreated roasted sand.

[0082] Among them, the oxidative roasting includes a first stage roasting and a second stage roasting; the roasting atmosphere of the first stage roasting is a low-oxygen atmosphere (the oxygen content is 21%), the roasting temperature is 500°C, and the roasting time is 30 minutes; the roasting atmosphere of the second stage roasting is an oxygen-rich atmosphere (the oxygen content is 30%), the roasting temperature is 650°C, and the roasting time is 15 minutes.

[0083] S3. Antimony is leached from the pretreated roasted sand using an antimony leaching agent under microwave assistance to obtain an antimony-containing leaching solution and a gold-containing leaching residue, the antimony leaching rate is 98.88%, the antimony-containing leaching solution is used to prepare an antimony product, and the gold-containing leaching residue is used in subsequent steps.

[0084] Among them, the power of microwave assistance is 0.5kW; the leaching temperature of antimony leaching is 80°C, the leaching time is 90min, and the liquid-solid ratio is 4:1; the antimony leaching agent is a compound of sodium sulfide and sodium hydroxide, the concentration of sodium sulfide is 100g / L, and the concentration of sodium hydroxide is 100g / L.

[0085] S4. The gold-containing leaching residue is subjected to carbon slurry leaching with the assistance of a gold leaching agent and activated carbon under microwave assistance to obtain a gold leaching mother liquor, gold-loaded carbon particles and final leaching residue, with a gold leaching rate of 96.74%. The gold leaching mother liquor is returned to the carbon slurry leaching step, the gold-loaded carbon particles are used to recover the gold element, and the final leaching residue is stored, landfilled or used as an auxiliary building material.

[0086] Among them, the power of microwave assistance is 2.0kW; the leaching pH of carbon slurry leaching is 10.5, the leaching temperature is 50°C, the leaching time is 120min, and the bottom carbon concentration is 15g / L; the activated carbon is coconut shell carbon; the gold leaching agent is sodium cyanide, and the dosage is 2kg / t·feed ore.

[0087] Comparative Example 1

[0088] Comparison is made between Control Example 1 and Example 1; the difference between Control Example 1 and Example 1 is that: in S2, the dissociated ore is fed into a tubular furnace for oxidative roasting (i.e., the oxidative roasting is static roasting) to obtain pretreated roasted sand; other conditions such as the selection of feed ore, the selection and dosage of reagents, and the remaining process flow and condition parameters are the same as those in Example 1 (compared with Example 1, this Control Example uses static roasting instead of suspended roasting to prove that the leaching method disclosed herein is more effective).

[0089] The results showed that in S3, the leaching rate of antimony was 90.87%; in S4, the leaching rate of gold was 60.58%.

[0090] It can be seen that compared with the leaching method of Example 1, the leaching rate of antimony and the leaching rate of gold in the leaching method of Control Example 1 are significantly reduced.

[0091] Therefore, the leaching method of the embodiment of the present disclosure can improve the mineral activation efficiency by performing suspension roasting, thereby improving the leaching rate of antimony and the leaching rate of gold.

[0092] Comparative Example 2

[0093] Comparative Example 2 is compared with Example 1; the difference between Comparative Example 2 and Example 1 is that: in S3, antimony leaching is not carried out under microwave assistance; in S4, carbon slurry leaching is not carried out under microwave assistance; other conditions such as the selection of feed ore, the selection and dosage of reagents, and the remaining process flow and condition parameters are the same as those in Example 1 (compared with Example 1, antimony leaching and carbon slurry leaching in this comparative example are not carried out under microwave assistance, which is used to prove that the leaching method disclosed in the present invention is more effective).

[0094] The results showed that in S3, the leaching rate of antimony was 85.14%; in S4, the leaching rate of gold was 82.63%.

[0095] It can be seen that compared with the leaching method of Example 1, the leaching rate of antimony and the leaching rate of gold in the leaching method of Comparative Example 2 are significantly reduced.

[0096] Therefore, the leaching method of the embodiment of the present disclosure can effectively improve the leaching rate of antimony and gold by performing antimony leaching and carbon slurry leaching under the assistance of microwaves.

[0097] Comparative Example 3

[0098] Comparative Example 3 is compared with Example 1; the difference between Comparative Example 3 and Example 1 is that: in S3, antimony leaching is not carried out under microwave assistance; other conditions such as the selection of feed ore, the selection and dosage of reagents, and the remaining process flow and condition parameters are the same as those in Example 1 (compared with Example 1, antimony leaching is not carried out under microwave assistance in this comparative example, which is used to prove that the leaching method disclosed in the present invention is more effective).

[0099] The results showed that in S3, the leaching rate of antimony was 84.89%; in S4, the leaching rate of gold was 90.78%.

[0100] It can be seen that compared with the leaching method of Example 1, the leaching rate of antimony and the leaching rate of gold in the leaching method of Control Example 3 are significantly reduced; compared with the leaching method of Control Example 2, there is no significant difference in the leaching rate of antimony in the leaching method of Control Example 3, while the leaching rate of gold is significantly improved.

[0101] Therefore, the leaching method of the embodiment of the present disclosure can effectively improve the leaching rate of gold by performing carbon slurry leaching under the assistance of microwaves.

[0102] Comparative Example 4

[0103] Comparison was made between Control Example 4 and Example 1; the difference between Control Example 4 and Example 1 was that in S4, carbon slurry leaching was not carried out under microwave assistance; other conditions such as the selection of feed ore, the selection and dosage of reagents, and the remaining process flow and condition parameters were the same as those in Example 1 (compared with Example 1, carbon slurry leaching was not carried out under microwave assistance in this Control Example, which was used to prove that the leaching method disclosed herein is more effective).

[0104] The results showed that in S3, the leaching rate of antimony was 98.45%; in S4, the leaching rate of gold was 85.44%.

[0105] It can be seen that compared with the leaching method of Example 1, the leaching rate of antimony in the leaching method of Control Example 4 has no significant difference, while the leaching rate of gold is significantly reduced; compared with the leaching method of Control Example 2, the leaching rate of antimony and the leaching rate of gold in the leaching method of Control Example 4 are significantly improved.

[0106] Therefore, the leaching method of the embodiment of the present disclosure can not only effectively improve the leaching rate of antimony by performing antimony leaching under the assistance of microwaves, but also can further activate gold minerals, thereby effectively improving the leaching rate of antimony and gold.

[0107] In summary, the present disclosure provides a method for leaching antimony-containing refractory gold ore, which can at least achieve efficient leaching of gold and antimony in the antimony-containing refractory gold ore, thereby realizing the effect of synergistic utilization of gold and antimony.

Claims

1. A leaching method for antimony-containing refractory gold ore, characterized in that: include: Grinding the antimony-containing refractory gold ore to obtain dissociated minerals; oxidatively roasting the dissociated mineral to obtain pretreated roasted sand; Using an antimony leaching agent to leach antimony from the pretreated roasted sand to obtain an antimony-containing leaching solution and gold-containing leaching residue; as well as The gold-containing leaching residue is subjected to carbon slurry leaching using a gold leaching agent and activated carbon to obtain a gold leaching mother liquor, gold-loaded carbon particles and final leaching residue.

2. The leaching method according to claim 1, characterized in that The oxidative roasting includes suspension roasting.

3. The leaching method according to claim 1 or 2, characterized in that: The oxidative roasting includes a first stage roasting and a second stage roasting.

4. The leaching method according to claim 3, characterized in that: The first stage of calcination has a calcination atmosphere of low oxygen, a calcination temperature of 450 to 500° C., and a calcination time of 5 to 30 minutes. And / or, the calcination atmosphere of the second stage calcination is an oxygen-rich atmosphere, the calcination temperature of the second stage calcination is 600-700° C., and the calcination time of the second stage calcination is 15-60 min.

5. The leaching method according to claim 1, characterized in that The antimony leaching is performed under the assistance of a first microwave; Wherein, the power of the first microwave assistance is 0.5-3 kW.

6. The leaching method according to claim 1 or 5, characterized in that: The leaching temperature of the antimony leaching is 80-100° C., and the leaching time of the antimony leaching is 30-120 minutes.

7. The leaching method according to claim 1, characterized in that: The carbon slurry leaching is performed under the assistance of a second microwave; Wherein, the power of the second microwave assistance is 0.5-3 kW.

8. The leaching method according to claim 1 or 7, characterized in that: The leaching pH of the carbon slurry leaching is 10-11, the leaching temperature of the carbon slurry leaching is 30-60° C., and the leaching time of the carbon slurry leaching is 60-180 min.

9. The leaching method according to claim 1, characterized in that: The mass percentage of minerals with a particle size of -0.074 mm in the dissociated minerals is greater than or equal to 95%.

10. The leaching method according to claim 1, characterized in that: In the antimony-containing refractory gold ore, the grade of Au is 2-10 g / t, the grade of Sb is 0.3%-2.0%, the grade of As is 0.5%-3.0%, and the grade of S is 2.5%-10.5%.

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