Method for recovering refractory micro-fine particle pyrite from desliming product

Abstract

The invention discloses a method for recovering refractory micro-fine particle pyrite from a desliming product, and the thought forms a process method of combining and concentrating coarse and fine materials, strongly stirring, adding chemicals, scrubbing and dispersing, carrying out differential flotation, and carrying out quality-grading and quality-upgrading. According to the process method, the problems of separation, recovery and enrichment of the high-argillization refractory micro-fine particle grade pyrite are well solved. High-sulfur concentrate can be obtained after treatment through the method, and the sulfur grade of the high-sulfur concentrate can reach 45% or above; meanwhile, standard sulfur concentrate products can be obtained, the sulfur grade reaches 35% or above, and the technical index that the sulfur separation recovery rate of the mineral separation process reaches 70% or above is achieved. The method solves the problems that the recovery rate of the refractory micro-fine-particle-grade pyrite is low, and the grade of the sulfur concentrate does not reach the standard. The method has the characteristics of simple process, good index, easiness in industrial implementation and the like.

Description

Technical Field

[0001] The invention relates to a process for recovering fine-grained pyrite in desludging overflow of high-mud-content and high-alkalinity copper tailings, and belongs to the field of mineral flotation technology in mineral processing engineering. Background Art

[0002] Pyrite resources are the most important type of sulfur resources in my country. They are the most important resource for preparing sulfuric acid and sulfur, and associated pyrite is the most important ore type of pyrite resources in my country. Typical representatives are porphyry copper mines and complex polymetallic composite mines that contain a large amount of associated pyrite resources. Chengmenshan Copper Mine is a large polymetallic composite mine with copper and sulfur as the main elements, and coexisting molybdenum, iron, zinc, gold, silver and a variety of scattered elements. It has a wide variety of mineral resources and rich reserves, but the ore properties are complex.

[0003] After years of process optimization, the beneficiation process of Chengmenshan Copper Mine prioritizes copper selection. After the copper tailings are desludged in the desludging cyclone, the sand is settled and enters the main system for sulfur selection. The sulfur tailings are combined with the overflow of the desludging cyclone after being concentrated by the thickener and discharged.

[0004] Since the pyrite overflowed from desludging is mainly concentrated in the fine-grained grade, this type of material has high ore slime content and high alkalinity, and is a difficult-to-select material. When combined with the beneficiation tailings, the sulfur content in the tailings will exceed the standard, affecting the recycling of tailings resources for building materials. Therefore, it is necessary to recover the sulfur in the tailings and strengthen the recovery of fine-grained and difficult-to-select pyrite. At the same time, for the economic benefits of the mine, qualified sulfur concentrate products should be produced.

[0005] However, due to the low concentration, high sludge content and high alkalinity of the desludging overflow samples of copper tailings, if they are treated separately, they will inevitably be affected by the sludge and low concentration. Due to the fine particle size of the material, it is difficult to settle and concentrate, resulting in a large loss of sulfur recovery rate in the selected tailings. If the sulfur in the tailings is treated separately, it is difficult to reduce it to the building material utilization standard (S≤0.5%), and because of the influence of the sludge, the final sulfur concentrate grade is also affected and cannot meet the product requirements.

[0006] Therefore, developing an efficient separation and enrichment process for difficult-to-select fine-grained pyrite is the key to achieving this type of resource recovery, which is of great significance for improving the economic benefits of mines and increasing the comprehensive recovery rate of pyrite resources in my country. Summary of the invention

[0007] The present invention provides a method for recovering refractory fine-grained pyrite from a desludging product, the method comprising the following steps:

[0008] S1) allowing the desludging overflow of the copper tailings with a concentration of 5% to 15% to be naturally settled and concentrated, stirring evenly and then stopping the stirring, settling for 5min to 20min, and combining the bottom sand after settling with the ore dressing tailings, and the merging ratio is 1:2 to 5 for the concentrated overflow sample: coarse tailings, to achieve a slurry with a concentration of 15% to 30%;

[0009] S2) adding a sludge dispersant to the concentrated combined slurry, the sludge dispersant mainly inhibits and disperses silicate gangue minerals, mainly water glass: sodium carbonate, configured in a ratio of 1 to 3:1, and the dosage of the agent is 50 g / t to 200 g / t, followed by strong stirring and scrubbing, the strong stirring speed is 1000 r / min to 2000 r / min, the stirring time is 5 min to 10 min, so that the sludge is fully dispersed, and the sludge covering the surface of the target mineral is scrubbed and separated;

[0010] S3) The slurry after dispersion is subjected to flotation to recover pyrite in the slurry using a newly developed combined collector D. The collector is a combined collector based on butyl xanthate, with a dosage of 60 g / t to 120 g / t, and the frother is pine oil, with a dosage of 5 g / t to 10 g / t. A speed-differential roughing process is adopted, i.e., fast roughing is performed to obtain fast rough concentrate I, slow roughing is performed to obtain slow rough concentrate II, and the rough concentrate II is subjected to two rounds of selection to obtain concentrate III. The roughing tailings are subjected to two sweeping operations to obtain tailings products;

[0011] S4) The coarse concentrate I and coarse concentrate II obtained by flotation process are combined and classified. The laboratory uses a high-frequency vibrating screen with a screen specification of 0.023mm~0.037mm. The industry can use a cyclone group to control the amount of material under the screen: the proportion of the material on the screen reaches 1:1~3. Then, the fine material after classification is the standard sulfur concentrate with a sulfur content of ≥35%. The classified coarse sand can be selected once to obtain a high-grade sulfur concentrate with a sulfur content of ≥45%.

[0012] Furthermore, in the desludging overflow sample of the high-slime copper tailings in S1), the proportion of -0.037 mm exceeds 60%, and the sulfur grade in the desludging overflow sample is 5% to 12%. After concentration, the desludging overflow is combined with the tailings to reach a slurry concentration of 15% to 30%.

[0013] Furthermore, the method for dispersing the ore slime in S2) is to add a combined dispersant in a ratio of water glass: sodium carbonate = 1 to 3:1, and add 50 g / t to 200 g / t, followed by strong stirring and scrubbing, the strong stirring speed is 1000 r / min to 2000 r / min, and the stirring time is 5 min to 10 min, so that the ore slime is fully dispersed, and the ore slime covering the surface of the target mineral is scrubbed and separated.

[0014] Furthermore, in said S3), a combined collector D is added to flotation-recover pyrite in the pulp, wherein the collector is a combined collector mainly composed of butyl xanthate, with a dosage of 60 g / t to 120 g / t, and the foaming agent is pine oil, with a dosage of 5 g / t to 10 g / t.

[0015] Furthermore, the coarse concentrate obtained in S4) is subjected to a grading and quality classification process, so that the refractory fine-grained pyrite separation concentrate reaches the standard of standard sulfur concentrate (sulfur content ≥ 35%), and the above-screen material is controlled by the grading process: the amount of below-screen material: the amount of above-screen material ratio reaches 1:1 to 3.

[0016] Furthermore, the process for recovering difficult-to-select fine-grained pyrite from the desludging product is disclosed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The present invention is a flowchart of a method for recovering difficult-to-select fine-grained pyrite from a desludging product. DETAILED DESCRIPTION

[0018] The present invention provides a method for recovering refractory fine-grained pyrite from a desludging product, the method comprising the following steps:

[0019] S1) allowing the desludging overflow of the copper tailings with a concentration of 5% to 15% to be naturally settled and concentrated, stirring evenly and then stopping the stirring, settling for 5min to 20min, and combining the bottom sand after settling with the ore dressing tailings, and the merging ratio is 1:2 to 5 for the concentrated overflow sample: coarse tailings, to achieve a slurry with a concentration of 15% to 30%;

[0020] S2) adding a sludge dispersant to the concentrated combined slurry, the sludge dispersant mainly inhibits and disperses silicate gangue minerals, mainly water glass: sodium carbonate, configured in a ratio of 1 to 3:1, and the dosage of the agent is 50 g / t to 200 g / t, followed by strong stirring and scrubbing, the strong stirring speed is 1000 r / min to 2000 r / min, the stirring time is 5 min to 10 min, so that the sludge is fully dispersed, and the sludge covering the surface of the target mineral is scrubbed and separated;

[0021] S3) The slurry after dispersion is subjected to flotation to recover pyrite in the slurry using a newly developed combined collector D. The collector is a combined collector based on butyl xanthate, with a dosage of 60 g / t to 120 g / t, and the frother is pine oil, with a dosage of 5 g / t to 10 g / t. A speed-differential roughing process is adopted, i.e., fast roughing is performed to obtain fast rough concentrate I, slow roughing is performed to obtain slow rough concentrate II, and the rough concentrate II is subjected to two rounds of selection to obtain concentrate III. The roughing tailings are subjected to two sweeping operations to obtain tailings products;

[0022] S4) The coarse concentrate I and coarse concentrate II obtained by flotation process are combined and classified. The laboratory uses a high-frequency vibrating screen with a screen specification of 0.023mm~0.037mm. The industry can use a cyclone group to control the amount of material under the screen: the proportion of the material on the screen reaches 1:1~3. Then, the fine material after classification is the standard sulfur concentrate with a sulfur content of ≥35%. The classified coarse sand can be selected once to obtain a high-grade sulfur concentrate with a sulfur content of ≥45%.

[0023] Furthermore, in the desludging overflow sample of the high-slime copper tailings in S1), the proportion of -0.037 mm exceeds 60%, and the sulfur grade in the desludging overflow sample is 5% to 12%. After concentration, the desludging overflow is combined with the tailings to reach a slurry concentration of 15% to 30%.

[0024] Furthermore, the method for dispersing the ore slime in S2) is to add a combined dispersant in a ratio of water glass: sodium carbonate = 1 to 3:1, and add 50 g / t to 200 g / t, followed by strong stirring and scrubbing, the strong stirring speed is 1000 r / min to 2000 r / min, and the stirring time is 5 min to 10 min, so that the ore slime is fully dispersed, and the ore slime covering the surface of the target mineral is scrubbed and separated.

[0025] Furthermore, in said S3), a combined collector D is added to flotation-recover pyrite in the pulp, wherein the collector is a combined collector mainly composed of butyl xanthate, with a dosage of 60 g / t to 120 g / t, and the foaming agent is pine oil, with a dosage of 5 g / t to 10 g / t.

[0026] Furthermore, the coarse concentrate obtained in S4) is subjected to a grading and quality classification process, so that the refractory fine-grained pyrite separation concentrate reaches the standard of standard sulfur concentrate (sulfur content ≥ 35%), and the above-screen material is controlled by the grading process: the amount of below-screen material: the amount of above-screen material ratio reaches 1:1 to 3.

[0027] Furthermore, the process for recovering difficult-to-select fine-grained pyrite from the desludging product is disclosed.

Claims

1. A method for recovering refractory fine-grained pyrite from a desliming product, characterized in that: The method comprises the following steps: S1) allowing the desludging overflow of the copper tailings with a concentration of 5% to 15% to be naturally settled and concentrated, stirring evenly and then stopping the stirring, settling for 5min to 20min, and combining the bottom sand after settling with the ore dressing tailings, and the merging ratio is 1:2 to 5 for the concentrated overflow sample: coarse tailings, to achieve a slurry with a concentration of 15% to 30%; S2) adding a sludge dispersant to the concentrated combined slurry, the sludge dispersant mainly inhibits and disperses silicate gangue minerals, mainly water glass: sodium carbonate, configured in a ratio of 1 to 3:1, and the dosage of the agent is 50 g / t to 200 g / t, followed by strong stirring and scrubbing, the strong stirring speed is 1000 r / min to 2000 r / min, the stirring time is 5 min to 10 min, so that the sludge is fully dispersed, and the sludge covering the surface of the target mineral is scrubbed and separated; S3) The slurry after dispersion is subjected to flotation to recover pyrite in the slurry using a newly developed combined collector D. The collector is a combined collector based on butyl xanthate, with a dosage of 60 g / t to 120 g / t, and the frother is pine oil, with a dosage of 5 g / t to 10 g / t. A speed-differential roughing process is adopted, i.e., fast roughing is performed to obtain fast rough concentrate I, slow roughing is performed to obtain slow rough concentrate II, and the rough concentrate II is subjected to two rounds of selection to obtain concentrate III. The roughing tailings are subjected to two sweeping operations to obtain tailings products; S4) The coarse concentrate I and coarse concentrate II obtained by flotation process are combined and classified. The laboratory uses a high-frequency vibrating screen with a screen specification of 0.023mm~0.037mm. The industry can use a cyclone group to control the amount of material under the screen: the proportion of the material on the screen reaches 1:1~3. Then, the fine material after classification is the standard sulfur concentrate with a sulfur content of ≥35%. The classified coarse sand can be selected once to obtain a high-grade sulfur concentrate with a sulfur content of ≥45%.

2. The method according to claim 1, characterized in that: In the S1), the desludging overflow sample of the high-slime copper tailings accounts for more than 60% of -0.037 mm, and the sulfur grade in the desludging overflow sample is 5% to 12%. After concentration, the desludging overflow is combined with the tailings to reach a slurry concentration of 15% to 30%.

3. The method according to claim 1, characterized in that The method for dispersing the ore slime in S2) is to add a combined dispersant in a ratio of water glass to sodium carbonate of 1 to 3:1, and add 50 g / t to 200 g / t, followed by strong stirring and scrubbing, with a strong stirring speed of 1000 r / min to 2000 r / min and a stirring time of 5 min to 10 min, so that the ore slime is fully dispersed, and the ore slime covering the surface of the target mineral is scrubbed and separated.

4. The method according to claim 1, characterized in that In the S3), a combined collector D is added to flotation and recover pyrite in the ore pulp, wherein the collector is a combined collector mainly composed of butyl xanthate, with a dosage of 60 g / t to 120 g / t, and the foaming agent is pine oil, with a dosage of 5 g / t to 10 g / t.

5. The method according to claim 1, characterized in that The coarse concentrate obtained in S4) adopts a grading and quality classification process to achieve the separation of the difficult-to-select fine-grained pyrite concentrate to the standard of standard sulfur concentrate (sulfur content ≥ 35%), and the oversize material is controlled by the grading process: the ratio of the undersize material to the oversize material is 1:1 to 3.

6. A process for recovering refractory fine-grained pyrite from a deslimed product as claimed in any one of claims 1 to 5.

Images