Efficient flotation separation and water quality purification method for copper-molybdenum ore in high-cold and organic-matter-rich region

Abstract

The invention discloses an efficient flotation separation and water quality purification method for copper-molybdenum ore in a high-cold and organic-matter-rich region. The method comprises the steps of crushing and ore grinding operation; carrying out copper-molybdenum bulk flotation operation; bulk concentrate pretreatment operation; copper-molybdenum separation operation; return water shunting operation; concentrating tailings and treating water. The characteristic that the flotation return water is high in sodium sulfide content is utilized, the water treatment agent is matched, the flotation return water is subjected to circulating self-purification, and the negative influence of organic matter water on copper-molybdenum separation is relieved from the source. According to the method, ferrous sulfate, ferric chloride and sodium hexametaphosphate are adopted as mixed copper inhibitors, the inhibition effect of copper sulfide minerals is enhanced, and the copper-molybdenum separation efficiency is improved. The method is easy to operate and low in cost, and reference can be provided for comprehensive recovery of ore resources.

Description

Technical Field

[0001] The invention relates to the technical field of mineral processing, and in particular to a method for efficient flotation separation and water purification of copper-molybdenum ores in high-cold organic-rich areas. Background Art

[0002] Porphyry copper-molybdenum ore resources are the main source of copper concentrate and molybdenum concentrate. The copper obtained from porphyry copper mines accounts for more than 60% of the global copper production, and the molybdenum obtained accounts for more than 50% of the global molybdenum production. Obtaining copper and molybdenum concentrates from porphyry copper-molybdenum resources usually requires crushing and grinding, copper-molybdenum mixed flotation, copper-molybdenum separation and other processes to finally obtain copper sulfide concentrate and molybdenite concentrate. Since the floatability of copper sulfide minerals and molybdenite is similar, and in the copper-molybdenum mixed flotation stage, high-collection collectors such as multi-carbon xanthate, butyl ammonium black medicine, etc. are often used, and even copper sulfate is used for activation, which makes it difficult or difficult to separate copper and molybdenum, which seriously restricts the efficient development and utilization of copper-molybdenum resources.

[0003] In order to improve the separation efficiency of copper and molybdenum, the current research directions at home and abroad are mainly the removal of copper and molybdenum mixed concentrates, such as concentration, grinding, heating, etc.; the development of efficient copper mineral inhibitors, such as sodium sulfide, sodium hydrosulfide, sodium thioglycolate, sodium cyanide, Knox, etc.; the use of new processes or equipment, such as flotation columns, potential control technology, etc. In addition, water quality also has a great impact on copper and molybdenum separation. For example, due to the soil characteristics in Northeast my country, the organic matter content in the water is high, and the copper and molybdenum mixed concentrate produced there is difficult to effectively separate by conventional flotation methods, especially in the summer snowmelt period, the organic matter content increases, resulting in the inability to suppress copper sulfide minerals. The efficient separation of copper and molybdenum in this region has not been solved, resulting in a waste of copper and molybdenum resources. At present, most of the production still uses the copper and molybdenum separation process of sodium sulfide + kerosene. The flotation return water usually enters the tailings pond together with the mixed flotation tailings, and then directly returns for use, which easily causes the accumulation of refractory organic matter in the return water system, affecting the separation of copper and molybdenum and even the flotation index of copper and molybdenum mixed.

[0004] Therefore, developing an efficient copper-molybdenum separation technology for high-altitude, organic-rich areas to solve the negative impact of organic water on copper-molybdenum flotation will help improve the copper and molybdenum recovery rate of porphyry copper-molybdenum ore resources, improve the quality of copper and molybdenum concentrates, reduce inter-inclusion, and improve the utilization level of this type of ore resources. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention aims to provide a method for efficient flotation separation and water purification of copper-molybdenum ores in high-altitude, organic-rich areas.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] The method for efficient flotation separation and water purification of copper-molybdenum ore in high-altitude organic-rich areas includes the following steps:

[0008] S1. Crushing and grinding: crush the copper-molybdenum ore, mix the crushed product with one or both of organic-rich new water or purified water, and feed it into the mill for grinding to obtain the floating product with qualified particle size;

[0009] S2, copper-molybdenum mixed flotation operation: feeding the flotation product obtained in step S1 into a flotation machine, adding a collector butyl xanthate and a frother pine oil in sequence to carry out copper-molybdenum mixed flotation to obtain a copper-molybdenum mixed concentrate and a copper-molybdenum mixed flotation tailings;

[0010] S3, mixed concentrate pretreatment operation: the copper-molybdenum mixed concentrate obtained in step S2 is fed into a thickener for concentration and drug removal, and a water treatment agent is added for water purification. The bottom flow obtained is a concentrated mixed concentrate, and the overflow is purified water. The concentrated mixed concentrate enters the copper-molybdenum separation operation, and the purified water enters the tailings pond; the water treatment agent is ferric chloride;

[0011] S4, copper-molybdenum separation operation: the concentrated mixed concentrate obtained in step S3 is mixed with purified water and then fed into a flotation machine for copper-molybdenum separation and flotation, and copper inhibitor ZJDB-1, sodium sulfide and kerosene are added in sequence to finally obtain copper concentrate and molybdenum concentrate, which are respectively fed into a concentration filter press system for dehydration to recover flotation return water; the copper inhibitor ZJDB-1 is a mixture of ferrous sulfate, ferric chloride and sodium hexametaphosphate in a mass ratio of 5:5:1;

[0012] S5, backwater diversion operation: the flotation backwater obtained in step S4 is sent to the sedimentation tank to further recover fine metal particles, and the overflow water is diverted, part of which enters step S6 and part of which enters the tailings pond;

[0013] S6, tailings concentration and water treatment operation: the copper-molybdenum mixed flotation tailings obtained in step S2 and the overflow water diverted in step S5 are fed into a tailings thickener, and flocculants and water treatment agents are added for concentration and water purification. The purified water obtained is directly returned to step S1 for use, and the concentrated tailings enter the tailings pond and are mixed and stored with the purified water and overflow water returned to the tailings pond; the flocculant is polyphenylene amide and the water treatment agent is ferric chloride.

[0014] Furthermore, in step S2, the copper-molybdenum mixed flotation includes one roughing selection, multiple scavenging selections and multiple concentrating selections. Based on the dry ore weight of each ton of copper-molybdenum ore, 50-100 g / t of collector butyl xanthate and 20-50 g / t of frother pine oil are added in the roughing selection, 10 g / t of collector butyl xanthate is added in the scavenging selection, and no agent is added in the concentrating selection.

[0015] Furthermore, in step S3, the amount of water treatment agent used is 500-2000 g / t based on the weight of dry ore per ton of copper-molybdenum mixed concentrate.

[0016] Further, in step S4, the copper-molybdenum separation flotation includes one roughing selection, multiple scavenging selections and multiple concentrating selections; based on the weight of dry ore per ton of copper-molybdenum mixed concentrate, 3000-6000g / t of copper inhibitor ZJDB-1, 6000-12000g / t of sodium sulfide and 500-1500g / t of kerosene are added in the roughing selection, 1000g / t of sodium sulfide and 100-200g / t of kerosene are added in the scavenging selection, and no reagent is added in the concentrating selection; the copper inhibitor ZJDB-1 is a mixture of ferrous sulfate, ferric chloride and sodium hexametaphosphate in a mass ratio of 5:5:1.

[0017] Furthermore, in step S6, based on the weight of dry ore per ton of copper-molybdenum ore, the amount of flocculant used is 10-30 g / t, and the amount of water treatment agent used is 500-1000 g / t.

[0018] Further, in step S5, the mass of the overflow water entering step S6 is 1 / 30 of the total mass of the overflow water.

[0019] The beneficial effects of the present invention are:

[0020] (1) The present invention utilizes the characteristic of high sodium sulfide in flotation return water, combines with water treatment agent, circulates and self-purifies the flotation return water, and then reuses it as grinding feed water, thereby reducing the negative impact of organic-rich water on copper-molybdenum separation from the source.

[0021] (2) The present invention uses ferrous sulfate, ferric chloride and sodium hexametaphosphate as a mixed copper inhibitor to form a hydrophilic film on the surface of the copper mineral, thereby strengthening the inhibitory effect of the copper sulfide mineral and improving the copper-molybdenum separation efficiency.

[0022] (3) The present invention is simple to operate and low in cost, and can provide a reference for the comprehensive recovery of the ore resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a flow chart of the method of Example 1 of the present invention. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings. It should be noted that this embodiment is based on the technical solution and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to this embodiment.

[0025] A porphyry copper-molybdenum mine in Heilongjiang Province contains 0.40% copper and 0.017% molybdenum in its original ore. The copper minerals are mainly chalcopyrite and bornite, the molybdenum minerals are mainly molybdenite, and the gangue is mainly quartz, feldspar, etc. Since the soil in this area is black soil and the external water is rich in organic matter, it is difficult to separate copper and molybdenum. The molybdenum recovery rate of conventional copper-molybdenum flotation separation process is less than 30%. This embodiment provides a method for the efficient flotation separation and water purification of copper-molybdenum ores in high-altitude and organic-rich areas to treat the above-mentioned porphyry copper-molybdenum mine in Heilongjiang Province. The specific process is as follows: Figure 1 As shown:

[0026] The raw ore is crushed to -12mm, accounting for 95%, and then ground and graded with purified water or organic-rich new water from nearby rivers (only organic-rich new water is used initially, and then mixed with purified water after stable operation). The grinding concentration is 75%, and the graded product with a fineness of -0.074mm, accounting for 65%, enters the copper-molybdenum mixed flotation operation, and undergoes one roughing selection, two scavenging selections, and three concentrating selections (the dosage of reagents in each stage is as follows: 80g / t of butyl xanthate and 20g / t of pine oil are added in the roughing selection, 10g / t of butyl xanthate is added in the scavenging selection one, 10g / t of butyl xanthate is added in the scavenging selection two, and no reagents are added in the concentrating selection), to obtain copper-molybdenum mixed concentrate and copper-molybdenum mixed flotation tailings.

[0027] The copper-molybdenum mixed concentrate is concentrated by a 60m thickener, and 500g / t of ferric chloride is added. The overflow (purified water) of the 60m thickener enters the tailings pond, and the bottom flow (concentrated mixed concentrate) is subjected to a copper-molybdenum separation operation of one roughing, two scavenging and six concentrating (the dosage of reagents in each section is as follows: ZJDB-1 5000g / t, sodium sulfide 10000g / t, kerosene 500g / t are added in the roughing, sodium sulfide 1000g / t, kerosene 200g / t are added in the scavenging 1, sodium sulfide 1000g / t, kerosene 100g / t are added in the scavenging 2, and no reagents are added in the concentrating) to obtain copper concentrate (ore pulp) and molybdenum concentrate (foam). The molybdenum concentrate and copper concentrate are further concentrated and filtered to dehydrate, and the flotation return water is recovered. The copper inhibitor ZJDB-1 is a mixture of ferrous sulfate, ferric chloride and sodium hexametaphosphate in a mass ratio of 5:5:1.

[0028] Flotation return water adopts 3000m 3 The sedimentation tank further recovers useful metals. 3 1 / 30 of the overflow water in the sedimentation tank is diverted to the 62-meter thickener, and the copper-molybdenum mixed flotation tailings are added to the 62-meter thickener. According to the weight of dry ore per ton of copper-molybdenum ore, 10g / t of flocculant polybenzene amide and 500g / t of ferric chloride are added for concentration. The flotation return water and ferric chloride work together to purify the water quality. The overflow (purified water, pH ≈ 10) of the 62-meter thickener is returned to the grinding operation, and the underflow enters the tailings pond.

[0029] 3000m3 The remaining overflow water from the sedimentation tank enters the tailings pond.

[0030] The return water from the tailings pond can also be returned for use in grinding operations and copper-molybdenum separation operations.

[0031] The specific process experimental indicators of this embodiment are shown in Table 1.

[0032] Table 1

[0033]

[0034] It can be seen from Table 1 that after the implementation of the method in this embodiment, the comprehensive recovery rate of molybdenum in the ore dressing plant increased by more than 40 percentage points, with significant economic benefits, and the efficient comprehensive recovery of the copper-molybdenum resources was achieved.

[0035] For those skilled in the art, various corresponding changes and modifications can be made according to the above technical solutions and concepts, and all of these changes and modifications should be included in the protection scope of the claims of the present invention.

Claims

1. A method for efficient flotation separation and water purification of copper-molybdenum ores in high-altitude organic-rich areas, characterized in that: The following steps are involved: S1. Crushing and grinding: crush the copper-molybdenum ore, feed the crushed product and one or both of organic-rich new water or purified water into the mill for grinding, and obtain the floating product with qualified particle size; S2, copper-molybdenum mixed flotation operation: feeding the flotation product obtained in step S1 into a flotation machine for copper-molybdenum mixed flotation to obtain copper-molybdenum mixed concentrate and copper-molybdenum mixed flotation tailings; S3, mixed concentrate pretreatment operation: the copper-molybdenum mixed concentrate obtained in step S2 is fed into a thickener for concentration and drug removal, and a water treatment agent is added for water purification. The bottom flow obtained is a concentrated mixed concentrate, and the overflow is purified water. The concentrated mixed concentrate enters the copper-molybdenum separation operation, and the purified water enters the tailings pond; the water treatment agent is ferric chloride; S4, copper-molybdenum separation operation: the concentrated mixed concentrate obtained in step S3 is mixed with purified water and fed into a flotation machine for copper-molybdenum separation flotation to obtain copper concentrate and molybdenum concentrate, and the copper concentrate and molybdenum concentrate are respectively fed into a concentration filter press system for dehydration to recover flotation return water; S5, backwater diversion operation: the flotation backwater obtained in step S4 is sent to the sedimentation tank to further recover fine metal particles, and the overflow water is diverted, part of which enters step S6 and part of which enters the tailings pond; S6, tailings concentration and water treatment operation: the copper-molybdenum mixed flotation tailings obtained in step S2 and the overflow water diverted in step S5 are fed into a tailings thickener, and flocculants and water treatment agents are added for concentration and water purification. The purified water obtained is directly returned to step S1 for use, and the concentrated tailings enter the tailings pond and are mixed and stored with the purified water and overflow water returned to the tailings pond; the flocculant is polyphenylene amide and the water treatment agent is ferric chloride.

2. The method according to claim 1, characterized in that: In step S2, the copper-molybdenum mixed flotation includes one roughing selection, multiple scavenging selections and multiple concentrating selections. Based on the dry ore weight of each ton of copper-molybdenum ore, 50-100 g / t of butyl xanthate as a collector and 20-50 g / t of pine oil as a frother are added in the roughing selection, 10 g / t of butyl xanthate as a collector is added in the scavenging selection, and no reagent is added in the concentrating selection.

3. The method according to claim 1, characterized in that In step S3, the amount of water treatment agent used is 500-2000 g / t based on the weight of dry ore per ton of copper-molybdenum mixed concentrate.

4. The method according to claim 1, characterized in that: In step S4, the copper-molybdenum separation flotation includes one roughing selection, multiple scavenging selections and multiple concentrating selections; based on the dry ore weight of each ton of copper-molybdenum mixed concentrate, 3000-6000g / t of copper inhibitor ZJDB-1, 6000-12000g / t of sodium sulfide and 500-1500g / t of kerosene are added in the roughing selection, 1000g / t of sodium sulfide and 100-200g / t of kerosene are added in the scavenging selection, and no reagent is added in the concentrating selection; the copper inhibitor ZJDB-1 is a mixture of ferrous sulfate, ferric chloride and sodium hexametaphosphate in a mass ratio of 5:5:

1.

5. The method according to claim 1, characterized in that In step S6, based on the weight of dry ore per ton of copper-molybdenum ore, the amount of flocculant used is 10-30 g / t, and the amount of water treatment agent used is 500-1000 g / t.

6. The method according to claim 1, characterized in that In step S5, the mass of the overflow water entering step S6 is 1 / 30 of the total mass of the overflow water.

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