A beneficiation method for a copper nickel sulfide ore by flotation at different pH stages

Abstract

The application discloses a beneficiation method for flotation of copper nickel sulfide ore at different pH values, and relates to the technical field of metal beneficiation, and comprises steps of section grinding and flotation, etc. Different pH values are adopted for stage flotation of the nickel copper sulfide ore, weak alkaline flotation is adopted for the first stage flotation, and easy-floating nickel copper minerals are recovered; the Isa mill is adopted for fine grinding in the second stage, so that fine-grained useful minerals are dissociated, high-concentration weak acid flotation is adopted for the flotation, and difficult-to-select nickel copper minerals are recovered, and the acid-resistant collecting agent and the foaming agent are added, so that the copper nickel recovery rate index is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal ore dressing, more particularly to an ore dressing method for flotation of a copper-nickel sulfide ore at different pH stages. BACKGROUND

[0002] In the conventional ore dressing process of a certain complex nickel-copper sulfide ore, weak alkaline flotation is usually adopted. When the content of fine-grained nickel-copper minerals is high and the degree of oxidation alteration is high, the recovery rate of nickel and copper in the concentrate is low, resulting in metal loss. Compared with a neutral ore slurry system, nickel sulfide minerals have good floatability under both acidic and alkaline conditions, and molybdenite minerals have good floatability under acidic conditions. At the same time, the addition of sulfuric acid has a cleaning effect on the surface of the minerals, removes the overburden of gangue minerals such as serpentine on the surface of useful minerals, and enables the useful metal minerals to fully interact with the collector. However, the acid medium flotation has problems such as fast decomposition of conventional flotation reagents such as xanthate and black medicine in the acid medium, defoaming during the flotation process, and low pH value of the tailings water which is difficult to discharge. SUMMARY

[0003] The present application aims to solve the above technical problems by providing an ore dressing method for flotation of a copper-nickel sulfide ore at different pH stages, which can reduce the copper-nickel separation index of copper-nickel concentrate in mixed flotation of a copper-nickel sulfide ore.

[0004] To achieve the above-mentioned purpose, the present application specifically adopts the following technical solution: an ore dressing method for flotation of a copper-nickel sulfide ore at different pH stages, comprising the following steps:

[0005] Step 1: grinding the raw ore in a ball mill, adding sodium carbonate to adjust the pH value, feeding the ground ore slurry into a stirring barrel, adding a collector and an auxiliary collector and frother, and stirring uniformly, wherein the dosage of the collector is 80-150 g / t, and the dosage of the auxiliary collector and frother is 60-120 g / t;

[0006] Step 2: one-stage roughing of the ore slurry after adding reagents in step 1, wherein the concentration of one-stage roughing is 20-30%, and the roughing produces roughing concentrate and roughing tailings, and the roughing concentrate is subjected to two-stage cleaning to produce one-stage concentrate, and the tailings of the second-stage cleaning are returned to the one-stage roughing concentrate;

[0007] Step 3: combining the tailings of one-stage roughing and the tailings of second-stage cleaning in step 2 and feeding them into a cyclone classifier to classify coarse and fine products, and using Isa mill to finely grind the coarse product after classification;

[0008] Step 4: feeding the fine product after classification in step 3 and the Isa mill discharge together into a dewatering device for dewatering, and the concentration of the dewatered ore slurry is 40-60%;

[0009] Step 5, the dehydrated slurry in step 4 is fed into a closed stirring barrel, 98% concentrated sulfuric acid is added in the stirring barrel, and stirring is fully carried out;

[0010] Step 6, the stirred slurry in step 5 is fed into a dosing stirring barrel, acid-resistant collector S and acid-resistant frother A are added, and stirring is uniformly carried out, the amount of acid-resistant collector S is 100-200 g / t, and the amount of acid-resistant frother A is 100-200 g / t;

[0011] Step 7, the slurry after dosing and stirring in step 6 is subjected to two-stage roughing, and roughing concentrate and roughing tailings are obtained, the roughing concentrate is subjected to two-stage cleaning, and the tailings of the second-stage cleaning are returned to the first-stage cleaning;

[0012] Step 8, the tailings after the second-stage roughing in step 7 are fed into a stirring barrel to add acid-resistant collector S, and after uniform stirring, two-stage scavenging is carried out, and final tailings are discharged, the amount of acid-resistant collector S is 40-80 g / t, and the concentrate of the second-stage scavenging is returned to the dosing stirring barrel of the first-stage scavenging;

[0013] Step 9, the removed backwater in step 4 is used to dilute the acid-base value of the final tailings water, so that the pH value of the tailings reaches the standard and is discharged;

[0014] Step 10, the tailings of the first-stage cleaning in step 7 and the concentrate of the first-stage scavenging in step 8 are combined and returned to the dosing stirring barrel in step 6.

[0015] Preferably, in step 1, the grinding concentration is 50-70%, the grinding fineness is 60%-80% of -200 mesh, and the amount of sodium carbonate is 1-3 kg / t.

[0016] Preferably, in step 1, the collector is a xanthate collector, and the auxiliary collector frother is a black drug frother.

[0017] Preferably, in step 3, the fineness of the classified fine particle product of the cyclone is 70-90% of -280 mesh, and the concentration of the coarse particle product is 40-60%.

[0018] Preferably, in step 3, the fineness of the fine grinding product of the Isa mill is 70-90% of -280 mesh.

[0019] Preferably, in step 5, the pH value of the slurry is adjusted to 4-6.

[0020] Preferably, in step 6, the acid-resistant collector S is a mixture of benzothiazole compounds, thiophosphates and thioaminoformates, and the acid-resistant frother A is a polypropylene glycol ether.

[0021] The beneficial effects of the present application are as follows:

[0022] 1. By using the process of section grinding and flotation, the different pH values are used for the flotation of the difficult and easy flotation minerals, so as to improve the recovery rate of nickel and copper metals;

[0023] 2. By using the Isa mill for fine grinding in the second stage grinding, the effective monomer dissociation of fine particle nickel and copper sulfide is realized, which is beneficial to improve the combination of copper and nickel minerals with the collector, so as to improve the floatability of fine particle nickel and copper sulfide minerals;

[0024] 3. By adding the acid-resistant collector S and the acid-resistant frother A, the acid-resistant collector S is a mixture of benzothiazole compounds, thiophosphate and thioaminoformate, the acid-resistant frother A is a polypropylene glycol ether, the amount of the acid-resistant collector S is 100-200 g / t, and the amount of the acid-resistant frother A is 100-200 g / t, so as to solve the problem of decomposition and no foaming under the acid condition of the conventional flotation reagent;

[0025] 4. By using high concentration flotation in the second stage roughing, the total acid addition amount and the reagent addition amount are reduced, the weak alkaline backwater is used for neutralizing the tailing slurry, the pH value of the slurry is improved, the tailings can be discharged up to the standard, so as to solve the problem of low pH value of the tailing water and difficult to discharge up to the standard. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is the process flow chart of the present application. DETAILED DESCRIPTION

[0027] The present application will be described in detail below in combination with the drawings and specific embodiments, and the schematic embodiments and the description of the present application are used to explain the present application, but not as the limitation of the present application.

[0028] Example 1

[0029] Please refer to Figure 1 The present application provides the following technical solutions: a beneficiation method for different pH value stages of copper and nickel sulfide minerals, comprising the following steps:

[0030] Step 1, the raw ore is subjected to one stage grinding, the grinding concentration is 50-70%, the grinding fineness is 60%-80% of -200 mesh, sodium carbonate is added in the ball mill to adjust the pH value, the amount of sodium carbonate is 1 kg / t-3 kg / t, the ground slurry is fed into the stirring barrel, the collector and the auxiliary collector frother are added and stirred uniformly, the amount of the collector is 80-150 g / t, the amount of the auxiliary collector frother is 60-120 g / t, the collector is a xanthate collector, and the auxiliary collector frother is a black drug frother;

[0031] Step 2, the ore slurry after adding the reagent in step 1 is subjected to one-stage roughing flotation, the one-stage roughing concentration is 20-30%, and the one-stage roughing flotation produces roughing concentrate and roughing tailings, the roughing concentrate is subjected to two-stage cleaning to produce one-stage concentrate, and the tailings of the second cleaning are returned to the one-stage roughing concentrate;

[0032] Step 3, the tailings of the one-stage roughing and the tailings of the second cleaning in step 2 are combined and fed into a cyclone classifier, the product fineness of the fine particle stage of the cyclone classifier is 70-90% of -280 mesh, and the coarse particle stage product and the fine particle stage product are classified, the concentration of the coarse particle stage product is 40-60%, and the coarse particle stage product after the classification is subjected to fine grinding by an Isa mill, and the product particle size of the Isa mill fine grinding is 70-90% of -280 mesh;

[0033] Step 4, the fine particle stage product after the classification in step 3 and the Isa mill discharge are fed into a dewatering device for dewatering, and the concentration of the dewatered ore slurry is 40-60%;

[0034] Step 5, the dewatered ore slurry in step 4 is fed into a closed stirring barrel, 98% concentrated sulfuric acid is added in the stirring barrel, the 98% concentrated sulfuric acid can also be diluted sulfuric acid, the pH value of the ore slurry is adjusted to 4-6, and the stirring is fully carried out;

[0035] Step 6, the stirred ore slurry in step 5 is fed into a reagent adding stirring barrel, acid-resistant collector S and acid-resistant frother A are added, and the stirring is uniformly carried out, the acid-resistant collector S is a mixture of benzothiazole compound, thiophosphate and thioaminoformate, the acid-resistant frother A is polypropylene glycol ether, the amount of the acid-resistant collector S is 100-200 g / t, and the amount of the acid-resistant frother A is 100-200 g / t;

[0036] Step 7, the ore slurry after the reagent adding stirring in step 6 is subjected to two-stage roughing flotation, and the two-stage roughing flotation produces roughing concentrate and roughing tailings, the roughing concentrate is subjected to two-stage cleaning to produce two-stage concentrate, and the tailings of the second cleaning are returned to the one-stage cleaning;

[0037] Step 8, the tailings of the second roughing in step 7 are fed into a stirring barrel to add acid-resistant collector S, and the stirring is uniformly carried out, then two-stage scavenging is carried out, and the final tailings are discharged, the amount of the acid-resistant collector S is 40-80 g / t, and the concentrate of the second scavenging is returned to the reagent adding stirring barrel of the one-stage scavenging;

[0038] Step 9, the backwater discharged in step 4 is used to dilute the acid-base degree of the final tailings water, so that the pH value of the tailings reaches the standard and is discharged;

[0039] Step 10, the tailings of the one-stage cleaning in step 7 and the concentrate of the one-stage scavenging in step 8 are combined and returned to the reagent adding stirring barrel in step 6.

[0040] In the embodiment, by using stage flotation, the easily floating nickel copper minerals are recovered in the first stage flotation, the useful minerals are fully dissociated by fine grinding in the second stage, the refractory nickel copper sulfide and molybdenite are floated by adding acid slurry, the persistent acid-resistant sulfide collector S and the foaming agent A are used, which do not decompose in the acid slurry, the foam is rich, persistent and stable, and the effect of improving the recovery rate of nickel and copper is achieved; dehydration is carried out before adding acid in the second stage flotation, the concentration of the second stage flotation is improved, the amount of acid added is reduced, the removed backwater is used to dilute the tailing slurry, and the pH value of the tailing is improved to achieve standard discharge.

[0041] The technical solutions provided by the embodiments of the present application are described in detail above, specific examples are applied in this paper to describe the principles and implementation manners of the embodiments of the present application, the above descriptions of the embodiments are only applicable to help understand the principles of the embodiments of the present application, and for the general technical personnel in the art, the embodiments of the present application will have changes in specific implementation manners and application ranges, and in conclusion, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A beneficiation method of copper nickel sulfide ore flotation at different pH stages, characterized in that, It comprises the following steps: Step 1, the raw ore is subjected to one-stage grinding, sodium carbonate is added in the ball mill to adjust the pH value, the ground ore slurry is fed into a stirring barrel, a collector and an auxiliary collecting and frothing agent are added and stirred uniformly, the collector is used in an amount of 80-150 g / t, and the auxiliary collecting and frothing agent is used in an amount of 60-120 g / t; Step 2, the ore slurry to which the reagents are added in step 1 is subjected to one-stage roughing, the one-stage roughing concentration is 20-30%, roughing concentrate and roughing tailings are produced after one-stage roughing, the roughing concentrate is subjected to two-stage cleaning to produce one-stage concentrate, and the tailings of the second cleaning are returned to the one-stage roughing concentrate; Step 3, the tailings of the one-stage roughing and the tailings of the second cleaning in step 2 are combined and fed into a cyclone for classification, coarse and fine products are classified, and the classified coarse product is subjected to fine grinding by an Isa mill; Step 4, the classified fine product in step 3 and the Isa mill discharge are fed into a dewatering device for dewatering, and the dewatered ore slurry has a concentration of 40-60%; Step 5, the dewatered ore slurry in step 4 is fed into a closed stirring barrel, 98% concentrated sulfuric acid is added, and stirring is performed; Step 6, the stirred ore slurry in step 5 is fed into a reagent-adding stirring barrel, acid-resistant collector S and acid-resistant frothing agent A are added, and stirring is performed, the acid-resistant collector S is used in an amount of 100-200 g / t, and the acid-resistant frothing agent A is used in an amount of 100-200 g / t; Step 7, the reagent-stirred ore slurry in step 6 is subjected to two-stage roughing, and roughing concentrate and roughing tailings are produced after two-stage roughing, the roughing concentrate is subjected to two-stage cleaning to produce two-stage concentrate, and the tailings of the second cleaning are returned to the one-stage cleaning; Step 8, the tailings of the second roughing in step 7 are fed into a stirring barrel to which acid-resistant collector S is added, and two-stage scavenging is performed after uniform stirring, and the final tailings are discharged, the acid-resistant collector S is added in an amount of 40-80 g / t, and the concentrate of the second scavenging is returned to the reagent-adding stirring barrel of the first scavenging; Step 9, the backwater discharged in step 4 is used to dilute the acid-base value of the final tailings water, so that the pH value of the tailings reaches the standard and is discharged; Step 10, the tailings of the first cleaning in step 7 and the concentrate of the first scavenging in step 8 are combined and returned to the reagent-adding stirring barrel in step 6.

2. The mineral processing method for different pH stages of copper nickel sulfide ore flotation according to claim 1, characterized in that: In step 1, the grinding concentration is 50-70%, the grinding fineness is 60-80% of -200 mesh, and the amount of sodium carbonate is 1-3 kg / t.

3. The mineral processing method for different pH stages of copper nickel sulfide flotation according to claim 1, characterized in that: In step 1, the collector is a xanthate collector, and the auxiliary collecting and frothing agent is a black medicine frothing agent.

4. The mineral processing method for different pH stages of copper nickel sulfide flotation according to claim 1, characterized in that: In step 3, the cyclone classified fine product has a fineness of 70-90% of -280 mesh, and the coarse product has a concentration of 40-60%.

5. The mineral processing method for different pH stages of copper nickel sulfide flotation according to claim 1, characterized in that: In step 3, the Isa mill fine grinding product has a particle size of 70-90% of -280 mesh.

6. The mineral processing method for flotation of copper nickel sulfide ores at different pH stages according to claim 1, characterized in that: In step 5, the pH value of the ore slurry is adjusted to 4-6.

7. The mineral processing method for flotation of copper nickel sulfide ores at different pH stages according to claim 1, characterized in that: In step 6, the acid-resistant collector S is a mixture of benzothiazole compounds, thiophosphates and thioaminoformates, and the acid-resistant frothing agent A is a polypropylene glycol ether.

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