Sorting method for sulfur-oxygen mixed gold ore

Abstract

The invention relates to the technical field of mineral processing, and particularly discloses a sorting method for sulfur-oxygen mixed gold ore. The grading method provided by the invention is particularly suitable for grading gold ores with highly mixed sulfide and oxide minerals, the influence of refractory gold on high-quality gold concentrates can be effectively reduced by magnetic separation and diversion, the high-value gold concentrates are quickly and efficiently separated by Nelson separation and gold flotation, the loss of the refractory gold is greatly reduced by centrifugal reselection, and the quality of the gold concentrates is improved. The fine grinding-cyaniding process greatly improves the utilization rate of refractory gold. According to the method, the recovery rate of gold can be effectively increased, the technical problem that gold-loaded iron oxide and micro-fine particle gold are difficult to utilize is solved, and the method is suitable for treating sulfur-oxygen mixed gold ores with complex and dispersed mineral occurrence states of gold.

Description

Technical Field

[0001] The present invention relates to the technical field of mineral processing, and particularly to a separation method for sulfur-oxygen mixed type gold ore. Background Art

[0002] Gold is the precious metal resource closest to people's livelihood and has the dual attributes of finance and commodity. As the general equivalent of currency, gold is the yardstick for measuring the daily currency value of people, providing an important support for the national finance and economic security. In daily life, gold is a common raw material for jewelry, which is also the main current consumption direction of gold; in addition, gold can be used to make metal coatings, special catalysts, etc., and its consumption in industrial production is also increasing day by day.

[0003] To ensure the stability of China's gold consumption market and make further full use of domestic gold ore resources, it is of great significance to improve the recovery rate of gold ore resources.

[0004] The main problem in the separation of sulfur-oxygen mixed type gold ore is that there are many types of gold-bearing minerals, and the properties of different types of gold-bearing minerals vary greatly. It is difficult to obtain ideal separation indexes by using a single separation process or a simple composite separation process.

[0005] Therefore, aiming at the problem of gold recovery from sulfur-oxygen mixed type gold ore, it is necessary to develop an efficient recovery method according to the mineral characteristics to achieve the full utilization of resources. Summary of the Invention

[0006] The main technical problem to be solved by the present invention is to provide a separation method for sulfur-oxygen mixed type gold ore. The method of the present invention can effectively improve the recovery rate of gold and is suitable for treating sulfur-oxygen mixed type gold ore with complex and dispersed occurrence states of gold minerals.

[0007] To solve the above technical problem, the technical solution adopted by the present invention is: a separation method for sulfur-oxygen mixed type gold ore, wherein the sulfur-oxygen mixed type gold ore contains gold-bearing iron oxides, and the separation method includes the steps of:

[0008] Coarsely grinding the sulfur-oxygen mixed type gold ore, and then performing magnetic separation for shunting to obtain non-magnetic products and magnetic products containing gold-bearing iron oxides respectively;

[0009] The non-magnetic products are separated by a Nelson concentrator to obtain gold concentrate 1 and Nelson separation tailings;

[0010] The Nelson separation tailings are reground and then subjected to gold flotation to obtain gold concentrate 2 and flotation tailings;

[0011] The flotation tailings are subjected to centrifuge gravity separation to obtain gold concentrate 3 and gravity separation tailings;

[0012] The gold concentrate 3 and the magnetic product containing gold-loaded iron oxide are combined, then finely ground, and then subjected to cyanidation leaching to obtain a gold-containing leaching solution.

[0013] As an embodiment of the present invention, the coarse grinding includes the steps of: preparing a pulp with a mass percentage concentration of 60-70% from the sulfide-oxide mixed gold ore, performing grinding, and controlling the fineness of the grinding product so that the minerals with a particle size of -0.074 mm account for 55-60% by mass. Among them, the minerals with a particle size of -0.074 mm accounting for 55-60% by mass means that the mass percentage content of the minerals with a particle size lower than 0.074 mm in the obtained grinding product is 55-60%.

[0014] As an embodiment of the present invention, the re-grinding includes the steps of: preparing a pulp with a mass percentage concentration of 60-65% from the tailings of the Knelson separator, performing grinding, and controlling the fineness of the grinding product so that the minerals with a particle size of -0.074 mm account for 80-90% by mass, that is, the mass percentage content of the minerals with a particle size lower than 0.074 mm in the grinding product is 80-90%.

[0015] As an embodiment of the present invention, the fine grinding includes the steps of: combining the gold concentrate 3 and the magnetic product containing gold-loaded iron oxide and then preparing a pulp with a mass percentage concentration of 50-55%, performing grinding, and controlling the fineness of the grinding product so that the minerals with a particle size of -0.038 mm account for 80-85% by mass, that is, the mass percentage content of the minerals with a particle size lower than 0.038 mm in the grinding product is 80-85%.

[0016] As an embodiment of the present invention, the high-intensity magnetic separation includes high-intensity magnetic rougher separation and high-intensity magnetic scavenging. The high-intensity magnetic rougher separation includes one-stage high-intensity magnetic rougher separation, and the high-intensity magnetic scavenging includes 1-2 stages of high-intensity magnetic scavenging. The concentrates obtained from the high-intensity magnetic rougher separation and the high-intensity magnetic scavenging are combined to be the magnetic product containing gold-loaded iron oxide, and the tailings obtained from the high-intensity magnetic scavenging are the non-magnetic product.

[0017] As an embodiment of the present invention, the high-intensity magnetic rougher separation and the high-intensity magnetic scavenging use a pulsating high-gradient high-intensity magnetic separator. The background magnetic field strength of the high-intensity magnetic rougher separation is 0.4-0.6 T, the medium size is 2.5-3 mm, and the medium filling rate is 12-15%; the background magnetic field strength of the high-intensity magnetic scavenging is 0.6-0.8 T, the medium size is 2-2.5 mm, and the medium filling rate is 15-20%.

[0018] As an embodiment of the present invention, the separation by the Knelson concentrator includes one-stage Knelson rougher separation and 1-2 stages of Knelson scavenging. The gravitational field of the Knelson rougher separation is 55-60 G, and the gravitational field of the Knelson scavenging is 60-70 G; the concentrates obtained from the rougher separation and the scavenging are combined to be the gold concentrate 1, and the tailings obtained from the scavenging are the tailings of the Knelson separation.

[0019] As an embodiment of the present invention, the gold flotation includes one-stage roughing of gold flotation, one-stage cleaning of gold flotation, and 1-2 stages of scavenging of gold flotation. During the gold flotation process, the concentrated tailings obtained and the scavenging concentrates of each stage are sequentially returned to the previous flotation operation; the concentrate product of the gold flotation cleaning is the gold concentrate 2, and the tailings product of the gold flotation scavenging is the flotation tailings.

[0020] As an embodiment of the present invention, the activator used in the gold flotation is copper sulfate, the collector is butyl xanthate, and the frother is No. 2 oil.

[0021] As an embodiment of the present invention, the centrifuge gravity separation includes one-stage centrifugal roughing and one-stage centrifugal scavenging. The concentrates obtained from the centrifugal roughing and centrifugal scavenging are combined, which is the gold concentrate 3; the tailings of the centrifugal scavenging are the gravity separation tailings; the gravity field of the centrifugal roughing is 12-15G, and the gravity field of the centrifugal scavenging is 15-20G.

[0022] As an embodiment of the present invention, the leaching agent used in the cyanidation leaching is sodium cyanide, and the pH value of the leaching operation is controlled to be 10-11.

[0023] For the separation method of sulfide-oxide mixed gold ore provided by the present invention, the gold-bearing minerals in the sulfide-oxide mixed gold ore to be processed include gold carried by iron oxides, native gold, and gold carried by sulfides, etc. The characteristics of gold-bearing iron oxides are easy to dissociate, but the gold they carry is usually deeply wrapped, so the selectivity is poor and it is difficult to improve the quality deeply. The separation method provided by the present invention first performs magnetic separation and diversion of minerals. Under the condition that the sulfide-oxide minerals in the original ore of the sulfide-oxide mixed gold ore are coarsely ground to achieve sufficient mutual dissociation, strong magnetic separation is used to divert the minerals, separating the gold-bearing iron oxides from the main process to obtain a magnetic product containing gold-bearing iron oxides and a non-magnetic product. Then the non-magnetic product is directly recovered for high-grade gold concentrate using a Nelson concentrator, separating the coarse-grained high-grade gold minerals from the main process to obtain gold concentrate 1 with a high gold grade; the Nelson separation tailings are reground and then floated to recover the medium and fine-grained gold and the gold mainly carried by sulfide minerals in the main process to obtain gold concentrate 2 with a relatively high gold grade; the flotation tailings are subjected to centrifuge gravity separation to reduce the tailings to recover the fine-grained and micro-fine gold in the main process to obtain gold concentrate 3; the magnetic product is combined with gold concentrate 3 and after fine grinding, they are subjected to cyanidation leaching together. For the gold-bearing iron oxides (magnetic product) and centrifugal concentrate (gold concentrate 3) that are difficult to improve the quality deeply, fine grinding-cyanidation leaching is carried out, which can recover the gold deeply wrapped by the minerals, thus realizing the effective recovery of the difficult-to-upgrade gold.

[0024] The gold separation method for sulfide-oxide mixed gold ore provided by the present invention adopts a way of shunting and staging to recover gold according to the property characteristics of different types of gold-bearing minerals in the sulfide-oxide mixed gold ore. The present invention shunts the gold-bearing iron oxides that are easy to dissociate but difficult to upgrade from the raw ore through high-intensity magnetic separation, stripping most of the refractory gold from the main process preferentially, reducing the influence of this part of refractory gold on the subsequent separation process, and being beneficial to the centralized treatment of refractory gold; the grinding fineness of the feed for high-intensity magnetic separation needs to be controlled well in this process. If the ore is under-ground, the recovery of gold-bearing iron oxides will be insufficient. If the ore is over-ground, the pulp will be slime, affecting the subsequent gravity separation and flotation operations. After magnetic separation shunting, the non-magnetic product obtained contains a certain amount of coarse-grained, easy-to-separate, high-value native gold grains and a large proportion of gold associated bodies. The characteristics of this part of gold are high value and large monomer weight of ore particles. Therefore, it is not suitable for flotation but for gravity separation. In line with the principle of early recovery, the Nelson concentrator is first used to directly recover high-value gold concentrate. After Nelson separation, there are still some easy-to-float medium and fine-grained gold grains and gold-bearing sulfide minerals in its tailings. Through re-grinding - sulfide flotation process, this part of easy-to-float gold ore can be effectively recovered, and a gold concentrate with relatively high gold grade can be obtained. After flotation, the main residues in the flotation tailings are fine-grained gold and lean gold associated bodies. The centrifuge can recover this part of gold-containing components to the greatest extent. The gold distribution in gold-bearing iron oxides and lean gold associated bodies is relatively large, but the gold in them is difficult to be further enriched. This part of the product generally contains low sulfur. Through fine grinding - cyanide leaching, the maximum recovery of gold can be achieved.

[0025] The gold separation method for sulfide-oxide mixed gold ore provided by the present invention is particularly suitable for the separation of gold ore with highly mixed sulfide and oxide minerals. Magnetic separation shunting can effectively reduce the influence of refractory gold on high-quality gold concentrate. Nelson separation and gold flotation quickly and efficiently separate high-value gold concentrate. Centrifugal gravity separation greatly reduces the loss of refractory gold. Fine grinding - cyanide process greatly improves the utilization rate of refractory gold. The method of the present invention can effectively improve the gold recovery rate, solve the technical problems of the difficult utilization of gold-bearing iron oxides and fine-grained gold, and is suitable for treating sulfide-oxide mixed gold ore with complex and dispersed occurrence states of gold minerals. Brief Description of the Drawings

[0026] Figure 1 is the process flow chart of the gold separation method for sulfide-oxide mixed gold ore provided by the present invention. Detailed Embodiments

[0027] The technical solutions of the present invention will be described in detail below through specific embodiments. The following embodiments are intended to further illustrate the content of the present invention in detail, rather than limiting the scope of protection of the claims of the present invention.

[0028] In the following embodiments, when not specifically stated, the reagents used are all commercially available products.

[0029] In the present invention, the dosage of the reagent is not limited, and those skilled in the art can adjust it according to the actual situation of treating minerals.

[0030] It should be noted that the dosage of the reagent in the following examples is calculated based on the mass of the raw ore. For example, the total dosage of copper sulfate is 50 g / t, indicating that the total dosage of copper sulfate in the gold flotation operation for each ton of raw ore is 50 g.

[0031] Example 1

[0032] This embodiment provides a separation method for a sulfur-oxygen mixed type gold ore. The process flow diagram adopted is referred to Figure 1 as shown. The raw ore of the sulfur-oxygen mixed type gold ore comes from the gold ore in Heqing County, Dali, Yunnan Province. The gold grade of the raw ore is 3.02 g / t, and 13.21 wt% (wt% means mass percentage) of the gold is hosted in the gold-bearing iron oxides. The steps of the separation method are as follows:

[0033] (1) Coarse grinding of raw ore - high-intensity magnetic separation for diversion: The raw ore is formulated into a raw ore pulp with a mass percentage concentration of 65%, and coarse grinding is carried out. The fineness of the grinding product is controlled such that the particle size of -0.074 mm accounts for 56%;

[0034] Using a pulsating high-gradient high-intensity magnetic separator, the coarse grinding product is subjected to high-intensity magnetic separation for diversion. The operation includes one-stage high-intensity magnetic roughing and one-stage high-intensity magnetic scavenging. The background magnetic field strength for high-intensity magnetic roughing is 0.42 T, the medium size is 2.8 mm, and the medium filling rate is 12.5%; the background magnetic field strength for high-intensity magnetic scavenging is 0.6 T, the medium size is 2 mm, and the medium filling rate is 18%; the concentrate products of high-intensity magnetic roughing and high-intensity magnetic scavenging are combined, which is the magnetic product, mainly containing gold-bearing iron oxides. The final product after high-intensity magnetic scavenging is the non-magnetic product;

[0035] (2) Separation by a Knelson concentrator: Using a Knelson concentrator, the non-magnetic product is subjected to one-stage Knelson roughing and two-stage Knelson scavenging; the gravity field for Knelson roughing is 55 G, and the gravity fields for both Knelson scavenging stages are 60 G; the concentrate products of Knelson roughing and Knelson scavenging are combined to be the first gold concentrate, and the final product after Knelson scavenging is the Knelson separation tailings;

[0036] (3) Thickening and regrinding - gold flotation: The Knelson separation tailings are thickened to a pulp with a mass percentage concentration of 62% and then regrinded. The fineness of the regrinding product is such that the particle size of -0.074 mm accounts for 87%; one-stage flotation roughing, one-stage flotation cleaning, and one-stage flotation scavenging are carried out on the regrinding product; the cleaning tailings and the scavenging concentrate are sequentially returned to the previous flotation operation; the activator used for gold flotation is copper sulfate, with a total dosage of 50 g / t; the collector is butyl xanthate, with a total dosage of 150 g / t; the frother is No. 2 oil, with a total dosage of 30 g / t;

[0037] The concentrated product obtained from the flotation concentration is the gold concentrate 2, and the tailings product obtained from the scavenging is the flotation tailings;

[0038] (4) Centrifugal gravity separation: Use a horizontal centrifugal separator to perform one-stage centrifugal rough separation and one-stage centrifugal scavenging on the flotation tailings. The gravitational field for the centrifugal rough separation is 13G, and the gravitational field for the centrifugal scavenging is 16G; The combined concentrated products from the centrifugal rough separation and the centrifugal scavenging are the gold concentrate 3, and the tailings from the centrifugal scavenging are the gravity separation tailings, which are also the final tailings obtained from the beneficiation;

[0039] (5) Fine grinding - cyanidation leaching: Combine the magnetic product containing gold-bearing iron oxides and the gold concentrate 3, concentrate to a mass percentage concentration of 50%, and perform fine grinding. The fineness of the grinding product is controlled such that the particle size of -0.038mm accounts for 82%;

[0040] Perform cyanidation leaching on the fine grinding product. The dosage of sodium cyanide is 4500g / t. The pH value of the leaching operation is controlled at about 10.5, the liquid-solid ratio is controlled at 2.5:1, and the leaching time is 28h to obtain a gold-bearing leachate.

[0041] The separation results of this embodiment are specifically shown in Table 1. Through this beneficiation operation, for the gold ore raw ore with a gold grade of 3.02g / t, a beneficiation index with a comprehensive gold recovery rate of 92.73% can be obtained.

[0042] Table 1

[0043]

[0044]

[0045] Example 2

[0046] This embodiment provides a separation method for a sulfur-oxygen mixed type gold ore. The process flow diagram adopted is referred to Figure 1 as shown. The sulfur-oxygen mixed type gold ore raw ore comes from the gold mine in Kangding County, Ganzi Tibetan Autonomous Prefecture, Sichuan Province. The gold grade of the raw ore is 3.94g / t, and 11.37wt% of the gold is hosted in the gold-bearing iron oxides. The steps of the separation method are as follows:

[0047] (1) Coarse grinding of raw ore - strong magnetic separation and diversion: Prepare the raw ore into a raw ore pulp with a mass percentage concentration of 70%, perform coarse grinding, and control the fineness of the grinding product such that the particle size of -0.074mm accounts for 55%;

[0048] Using a pulsating high-gradient high-intensity magnetic separator, the coarse grinding product is subjected to high-intensity magnetic separation for shunting. The operations include a first-stage high-intensity magnetic roughing and a first-stage high-intensity magnetic scavenging. The background magnetic field intensity for the high-intensity magnetic roughing is 0.4 T, the medium size is 2.5 mm, and the medium filling rate is 12%; the background magnetic field intensity for the high-intensity magnetic scavenging is 0.65 T, the medium size is 2.4 mm, and the medium filling rate is 15%; the concentrate products of the high-intensity magnetic roughing and the high-intensity magnetic scavenging are combined, which is the magnetic product, mainly containing gold-bearing iron oxides. The final product after the high-intensity magnetic scavenging is the non-magnetic product;

[0049] (2) Knelson concentrator separation: Using a Knelson concentrator, the non-magnetic product is subjected to a first-stage Knelson roughing and a first-stage Knelson scavenging; the gravity field for the Knelson roughing is 58 G, and the gravity field for the Knelson scavenging is 62 G; the concentrate products of the Knelson roughing and the Knelson scavenging are combined to be the first gold concentrate, and the final product after the Knelson scavenging is the Knelson separation tailings;

[0050] (3) Thickening-regrinding - gold flotation: The Knelson separation tailings are thickened to a pulp with a mass percentage concentration of 64% and then re-ground. The fineness of the re-ground product is that the -0.074 mm particle size fraction accounts for 80%; the re-ground product is subjected to a first-stage flotation roughing, a first-stage flotation cleaning, and a first-stage flotation scavenging; the cleaning tailings and the scavenging concentrate are returned to the previous flotation operation in sequence; the activator used for gold flotation is copper sulfate, with a total dosage of 30 g / t; the collector is butyl xanthate, with a total dosage of 90 g / t; the frother is No. 2 oil, with a total dosage of 21 g / t;

[0051] The concentrate product of the flotation cleaning is the second gold concentrate, and the tailings product of the scavenging is the flotation tailings;

[0052] (4) Centrifugal concentrator separation: Using a horizontal centrifugal concentrator, the flotation tailings are subjected to a first-stage centrifugal roughing and a first-stage centrifugal scavenging. The gravity field for the centrifugal roughing is 12.5 G, and the gravity field for the centrifugal scavenging is 15 G; the concentrate products of the centrifugal roughing and the centrifugal scavenging are combined to be the third gold concentrate, and the centrifugal scavenging tailings are the gravity separation tailings, which are the final tailings obtained from the beneficiation;

[0053] (5) Fine grinding - cyanidation leaching: The magnetic product containing gold-bearing iron oxides and the third gold concentrate are combined, thickened to a 52% mass percentage concentration, and then finely ground. The fineness of the grinding product is controlled such that the -0.038 mm particle size fraction accounts for 85%;

[0054] The finely ground product is subjected to cyanidation leaching. The dosage of sodium cyanide is 4800 g / t. The pH value of the leaching operation is controlled at about 10.0, the liquid-solid ratio is controlled at 2.75:1, and the leaching time is 30 h to obtain the gold-containing leachate.

[0055] The separation results of this embodiment are shown in Table 2. Through this separation operation, for the raw gold ore with a gold grade of 3.94 g / t, a beneficiation index with a comprehensive gold recovery rate of 90.60% can be obtained.

[0056] Table 2

[0057] Product Name Yield % Gold Grade g / t Gold Recovery Rate % Leaching Solution / / 15.09 Leaching Residue 20.00 0.51 2.57 Gold Concentrate 1 0.75 225.49 42.95 Gold Concentrate 2 2.49 51.49 32.56 Gravity Separation Tailings 76.76 0.35 6.83 Feed 100.00 3.94 100.00

[0058] Example 3

[0059] This embodiment provides a separation method for sulfide-oxide mixed gold ore. The process flow diagram adopted is referred to Figure 1 as shown. The raw sulfide-oxide mixed gold ore comes from the gold mine in Songpan County, Aba Tibetan and Qiang Autonomous Prefecture, Sichuan Province. The raw ore has a gold grade of 3.70 g / t, and 25.95 wt% of the gold is hosted in the gold-bearing iron oxides. The steps of the separation method are as follows:

[0060] (1) Coarse grinding of raw ore - high-intensity magnetic separation for diversion: The raw ore is formulated into a raw ore pulp with a mass percentage concentration of 68%, and coarse grinding is carried out. The fineness of the grinding product is controlled such that the particle size of -0.074 mm accounts for 58%;

[0061] Using a pulsating high-gradient high-intensity magnetic separator, high-intensity magnetic separation is used to divert the coarsely ground product. The operation includes one-stage high-intensity magnetic roughing and two-stage high-intensity magnetic scavenging. The background magnetic field strength for high-intensity magnetic roughing is 0.5 T, the medium size is 2.8 mm, and the medium filling rate is 15%; the background magnetic field strength for the first-stage high-intensity magnetic scavenging is 0.7 T, the medium size is 2.5 mm, and the medium filling rate is 20%. The background magnetic field strength for the second-stage high-intensity magnetic scavenging is 0.8 T, the medium size is 2.0 mm, and the medium filling rate is 15%; the concentrate products from high-intensity magnetic roughing and high-intensity magnetic scavenging are combined, which is the magnetic product, mainly containing gold-bearing iron oxides. The final product after high-intensity magnetic scavenging is the non-magnetic product;

[0062] (2) Separation by Knelson concentrator: Using a Knelson concentrator, one-stage Knelson roughing and two-stage Knelson scavenging are carried out on the non-magnetic product; the gravity field for Knelson roughing is 60 G, and the gravity fields for both Knelson scavenging stages are 65 G; the concentrate products from Knelson roughing and Knelson scavenging are combined to be the first gold concentrate, and the final product after Knelson scavenging is the Knelson separation tailings;

[0063] (3) Thickening and regrinding - gold flotation: The Knelson separation tailings are thickened to a pulp with a mass percentage concentration of 63% and then regrinded. The fineness of the regrinded product is such that the particle size of -0.074 mm accounts for 82%; one-stage flotation roughing, one-stage flotation cleaning, and one-stage flotation scavenging are carried out on the regrinded product; the tailings from cleaning and the concentrate from scavenging are sequentially returned to the previous flotation operation; the activator used for gold flotation is copper sulfate, with a total dosage of 60 g / t; the collector is butyl xanthate, with a total dosage of 150 g / t; the frother is No. 2 oil, with a total dosage of 24 g / t;

[0064] The concentrated product of the flotation concentration is the gold concentrate 2, and the tailing product of the scavenging is the flotation tailing;

[0065] (4) Centrifugal gravity separation: Use a horizontal centrifugal concentrator to conduct one-stage centrifugal roughing and one-stage centrifugal scavenging on the flotation tailing. The gravity field of the centrifugal roughing is 12G, and the gravity field of the centrifugal scavenging is 17.5G; The combined concentrated products of the centrifugal roughing and the centrifugal scavenging are the gold concentrate 3, and the tailing of the centrifugal scavenging is the gravity separation tailing, which is also the final tailing obtained from the beneficiation;

[0066] (5) Fine grinding - cyanidation leaching: Combine the magnetic product containing gold-bearing iron oxide and the gold concentrate 3, concentrate to a mass percentage concentration of 55%, conduct fine grinding, and control the fineness of the grinding product to 83.5% for the -0.038mm particle size fraction;

[0067] Conduct cyanidation leaching on the fine grinding product. The dosage of sodium cyanide is 5000g / t, the pH value of the leaching operation is controlled at about 11.0, the liquid-solid ratio is controlled at 2.8:1, and the leaching time is 24h to obtain the gold-bearing leaching solution.

[0068] The separation results of this embodiment are specifically shown in Table 3. Through this beneficiation operation, for the gold ore raw ore with a gold grade of 3.70g / t, a beneficiation index with a comprehensive gold recovery rate of 89.87% can be obtained.

[0069] Table 3

[0070] Product Yield % Gold Grade g / t Gold Recovery Rate % Leaching Solution / / 34.31 Leaching Residue 31.18 0.52 4.35 Gold Concentrate 1 0.43 141.5 16.46 Gold Concentrate 2 3.72 38.85 39.10 Gravity Separation Tailings 64.67 0.33 5.78 Feed 100.00 3.70 100.00

[0071] Example 4

[0072] This embodiment provides a separation method for a sulfur-oxygen mixed type gold ore. The process flow chart adopted is referred to Figure 1 as shown. The sulfur-oxygen mixed type gold ore raw ore comes from the gold ore in Sagaing Region, Myanmar. The raw ore gold grade is 5.57g / t, and 12.47wt% of the gold is hosted in the gold-bearing iron oxide. The separation method steps are as follows:

[0073] (1) Raw ore coarse grinding - high-intensity magnetic separation diversion: Prepare the raw ore into a raw ore pulp with a mass percentage concentration of 60%, conduct coarse grinding, and control the fineness of the grinding product to 60% for the -0.074mm particle size fraction;

[0074] Using a pulsating high-gradient high-intensity magnetic separator, the coarsely ground product is subjected to high-intensity magnetic separation for shunt. The operations include first-stage high-intensity magnetic roughing and first-stage high-intensity magnetic scavenging. The background magnetic field intensity for the first-stage high-intensity magnetic roughing is 0.55 T, the medium size is 3.0 mm, and the medium filling rate is 12%; the background magnetic field intensity for the first-stage high-intensity magnetic scavenging is 0.78 T, the medium size is 2.2 mm, and the medium filling rate is 18%; the concentrate products from the first-stage high-intensity magnetic roughing and the first-stage high-intensity magnetic scavenging are combined, which is the magnetic product, mainly containing gold-bearing iron oxides. The final product after the first-stage high-intensity magnetic scavenging is the non-magnetic product;

[0075] (2) Knelson concentrator separation: Using a Knelson concentrator, the non-magnetic product is subjected to one-stage Knelson roughing and two-stage Knelson scavenging; the gravitational field for the Knelson roughing is 55 G, the gravitational field for the first-stage Knelson scavenging is 65 G, and the gravitational field for the second-stage Knelson scavenging is 70 G; the concentrate products from the Knelson roughing and the Knelson scavenging are combined to be gold concentrate 1, and the final product after the Knelson scavenging is the Knelson separation tailings;

[0076] (3) Thickening regrinding - gold flotation: The Knelson separation tailings are thickened to a pulp with a mass percentage concentration of 65% and then regrinded. The fineness of the regrinded product is that the particle size of -0.074 mm accounts for 85%; the regrinded product is subjected to one-stage flotation roughing, one-stage flotation cleaning, and one-stage flotation scavenging; the cleaning tailings and the scavenging concentrate are returned to the previous flotation operation in sequence; the activator used for gold flotation is copper sulfate, with a total dosage of 100 g / t; the collector is butyl xanthate, with a total dosage of 300 g / t; the frother is No. 2 oil, with a total dosage of 45 g / t;

[0077] The concentrate product from the flotation cleaning is gold concentrate 2, and the tailings product from the scavenging is the flotation tailings;

[0078] (4) Centrifugal concentrator separation: Using a horizontal centrifugal concentrator, the flotation tailings are subjected to one-stage centrifugal roughing and one-stage centrifugal scavenging. The gravitational field for the centrifugal roughing is 14 G, and the gravitational field for the centrifugal scavenging is 18 G; the concentrate products from the centrifugal roughing and the centrifugal scavenging are combined to be gold concentrate 3, and the centrifugal scavenging tailings are the gravity separation tailings, which are also the final tailings obtained from the beneficiation;

[0079] (5) Fine grinding - cyanide leaching: The magnetic product containing gold-bearing iron oxides and gold concentrate 3 are combined, thickened to a mass percentage concentration of 53%, and then finely ground. The fineness of the ground product is controlled such that the particle size of -0.038 mm accounts for 80%;

[0080] The finely ground product is subjected to cyanide leaching. The dosage of sodium cyanide is 4750 g / t. The pH value of the leaching operation is controlled at about 10.8, the liquid-solid ratio is controlled at 3:1, and the leaching time is 36 h to obtain a gold-bearing leachate.

[0081] The separation results of this embodiment are specifically shown in Table 4. Through this separation operation, for the gold ore raw material with a gold grade of 5.57 g / t, a beneficiation index with a comprehensive gold recovery rate of 95.79% can be obtained.

[0082] Table 4

[0083] Product Yield % Gold Grade g / t Gold Recovery Rate % Leaching Solution / / 18.93 Leaching Residue 13.31 0.38 0.90 Gold Concentrate 1 0.88 352.76 55.69 Gold Concentrate 2 5.49 21.49 21.17 Gravity Separation Tailings 80.32 0.23 3.31 Feed 100.00 5.57 100.00

[0084] Example 5

[0085] This embodiment provides a separation method for sulfur-oxygen mixed type gold ore. The process flow chart adopted refers to Figure 1 as shown. The sulfur-oxygen mixed type gold ore raw material comes from the gold ore in Heqing County, Dali City, Yunnan Province. The gold grade of the raw material is 3.73 g / t, and 11.17 wt% of the gold is hosted in the gold-bearing iron oxide. The steps of the separation method are as follows:

[0086] (1) Coarse grinding of raw ore - high-intensity magnetic separation for diversion: The raw ore is formulated into a raw ore pulp with a mass percentage concentration of 63%, and coarse grinding is carried out. The fineness of the grinding product is controlled such that the particle size of -0.074 mm accounts for 56.5%;

[0087] Using a pulsating high-gradient high-intensity magnetic separator, high-intensity magnetic separation is used to divert the coarsely ground product. The operation includes one-stage high-intensity magnetic roughing and one-stage high-intensity magnetic scavenging. The background magnetic field strength of the high-intensity magnetic roughing is 0.6 T, the medium size is 2.5 mm, and the medium filling rate is 12.8%; the background magnetic field strength of the high-intensity magnetic scavenging is 0.7 T, the medium size is 2.5 mm, and the medium filling rate is 17.5%; the concentrate products of the high-intensity magnetic roughing and high-intensity magnetic scavenging are combined, which is the magnetic product, mainly containing gold-bearing iron oxide. The final product after high-intensity magnetic scavenging is the non-magnetic product;

[0088] (2) Separation by Knelson concentrator: Using a Knelson concentrator, one-stage Knelson roughing and one-stage Knelson scavenging are carried out on the non-magnetic product; the gravity field of the Knelson roughing is 57 G, and the gravity field of the Knelson scavenging is 68 G; the concentrate products of the Knelson roughing and Knelson scavenging are combined to be gold concentrate 1, and the final product after Knelson scavenging is the Knelson separation tailings;

[0089] (3) Thickening and regrinding - gold flotation: The Knelson separation tailings are thickened to a pulp with a mass percentage concentration of 60% and then regrinded. The fineness of the regrinded product is such that the particle size of -0.074 mm accounts for 90%; one-stage flotation roughing, one-stage flotation cleaning, and two-stage flotation scavenging are carried out on the regrinded product; the cleaning tailings and scavenging concentrates are sequentially returned to the previous flotation operation; the activator used in gold flotation is copper sulfate, with a total dosage of 35 g / t; the collector is butyl xanthate, with a total dosage of 120 g / t; the foaming agent is No. 2 oil, with a total dosage of 24 g / t;

[0090] The concentrate product of the flotation cleaning is the gold concentrate 2, and the tailings product of the second-stage scavenging is the flotation tailings;

[0091] (4) Centrifugal gravity separation: Use a horizontal centrifugal concentrator to perform one-stage centrifugal roughing and one-stage centrifugal scavenging on the flotation tailings. The gravity field for centrifugal roughing is 15G, and the gravity field for centrifugal scavenging is 20G; The combined concentrate products of centrifugal roughing and centrifugal scavenging are the gold concentrate 3, and the tailings of centrifugal scavenging are the gravity separation tailings, which are also the final tailings obtained from the beneficiation;

[0092] (5) Fine grinding - cyanidation leaching: Combine the magnetic product containing gold-bearing iron oxides and the gold concentrate 3, concentrate to a mass percentage concentration of 54%, and perform fine grinding. The fineness of the grinding product is controlled such that the particle size of -0.038mm accounts for 84%;

[0093] Perform cyanidation leaching on the fine grinding product. The dosage of sodium cyanide is 4680g / t. The pH value of the leaching operation is controlled at about 10.2, the liquid-solid ratio is controlled at 2.6:1, and the leaching time is 32h to obtain the gold-containing leaching solution.

[0094] The separation results of this embodiment are specifically shown in Table 5. Through this beneficiation operation, for the gold ore raw ore with a gold grade of 3.73g / t, a beneficiation index of a comprehensive gold recovery rate of 87.59% can be obtained.

[0095] Table 5

[0096] Product Yield % Gold Grade g / t Gold Recovery Rate % Leaching Solution / / 19.96 Leaching Residue 25.89 0.49 3.42 Gold Concentrate 1 1.82 90.38 44.11 Gold Concentrate 2 2.49 35.22 23.52 Gravity Separation Tailings 69.80 0.48 8.99 Feed 100.00 3.73 100.00

[0097] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent transformation made using the content of the specification of the present invention, directly or indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A separation method for sulfur-oxygen mixed type gold ore, characterized in that, The sulfur-oxygen mixed gold ore contains gold-bearing iron oxides, and the beneficiation method includes the steps of: Coarsely grinding the sulfur-oxygen mixed gold ore, and then performing magnetic separation for diversion to obtain non-magnetic products and magnetic products containing gold-bearing iron oxides respectively; Separating the non-magnetic products by a Nelson concentrator to obtain gold concentrate 1 and Nelson separation tailings; Regrinding the Nelson separation tailings and then performing gold flotation to obtain gold concentrate 2 and flotation tailings; Performing gravity separation on the flotation tailings by a centrifuge to obtain gold concentrate 3 and gravity separation tailings; Combining gold concentrate 3 and the magnetic products containing gold-bearing iron oxides, then finely grinding, and then performing cyanide leaching to obtain a gold-containing leaching solution.

2. The sorting method according to claim 1, characterized in that, The coarse grinding includes the steps of: preparing the sulfur-oxygen mixed gold ore into a pulp with a mass percentage concentration of 60-70%, performing grinding, and controlling the fineness of the grinding product so that the minerals in the -0.074mm particle size fraction account for 55-60% by mass.

3. The separation method according to claim 1, characterized in that, The regrinding includes the steps of: preparing the Nelson separation tailings into a pulp with a mass percentage concentration of 60-65%, performing grinding, and controlling the fineness of the grinding product so that the minerals in the -0.074mm particle size fraction account for 80-90% by mass.

4. The separation method according to claim 1, characterized in that, The fine grinding includes the steps of: combining gold concentrate 3 and the magnetic products containing gold-bearing iron oxides and then preparing them into a pulp with a mass percentage concentration of 50-55%, performing grinding, and controlling the fineness of the grinding product so that the minerals in the -0.038mm particle size fraction account for 80-85% by mass.

5. The separation method according to claim 1, characterized in that The high-intensity magnetic separation includes high-intensity magnetic roughing and high-intensity magnetic scavenging. The high-intensity magnetic roughing includes one-stage high-intensity magnetic roughing, and the high-intensity magnetic scavenging includes 1-2 stages of high-intensity magnetic scavenging. The concentrates obtained from the high-intensity magnetic roughing and the high-intensity magnetic scavenging are combined, which is the magnetic product containing gold-bearing iron oxides, and the tailings obtained from the high-intensity magnetic scavenging are the non-magnetic products; The high-intensity magnetic roughing and the high-intensity magnetic scavenging use a pulsating high-gradient high-intensity magnetic separator. The background magnetic field strength of the high-intensity magnetic roughing is 0.4-0.6T, the medium size is 2.5-3mm, and the medium filling rate is 12-15%; the background magnetic field strength of the high-intensity magnetic scavenging is 0.6-0.8T, the medium size is 2-2.5mm, and the medium filling rate is 15-20%.

6. The sorting method according to claim 1, characterized in that, The separation by the Nelson concentrator includes one-stage Nelson roughing and 1-2 stages of Nelson scavenging. The gravity field of the Nelson roughing is 55-60G, and the gravity field of the Nelson scavenging is 60-70G; the concentrates obtained from the roughing and the scavenging are combined, which is gold concentrate 1, and the tailings obtained from the scavenging are the Nelson separation tailings.

7. The separation method according to claim 1, characterized in that, The gold flotation includes one-stage gold flotation roughing, one-stage gold flotation cleaning, and 1-2 stages of gold flotation scavenging. During the gold flotation process, the cleaning tailings and the scavenging concentrates obtained are sequentially returned to the previous flotation operation; the concentrate product of the gold flotation cleaning is gold concentrate 2, and the tailings product of the gold flotation scavenging is the flotation tailings; Among them, the activator used in the gold flotation is copper sulfate, the collector is butyl xanthate, and the frother is No. 2 oil.

8. The separation method according to claim 1, wherein The gravity separation of the centrifuge includes one-stage centrifugal roughing and one-stage centrifugal scavenging. The concentrates obtained from the centrifugal roughing and centrifugal scavenging are combined to obtain gold concentrate 3; the tailings of the centrifugal scavenging are the tailings of gravity separation; the gravity field of the centrifugal roughing is 12-15G, and the gravity field of the centrifugal scavenging is 15-20G.

9. The separation method according to claim 1, characterized in that, The leaching agent used in the cyanidation leaching is sodium cyanide, and the pH value of the leaching operation is controlled at 10-11.

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