CN114669400B - Bridge traction induced beneficiation method for copper-nickel sulfide ore - Google Patents
Bridge traction induced beneficiation method for copper-nickel sulfide ore Download PDFInfo
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- CN114669400B CN114669400B CN202210238930.5A CN202210238930A CN114669400B CN 114669400 B CN114669400 B CN 114669400B CN 202210238930 A CN202210238930 A CN 202210238930A CN 114669400 B CN114669400 B CN 114669400B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/14—Flotation machines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/001—Flotation agents
- B03D1/004—Organic compounds
- B03D1/016—Macromolecular compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2201/00—Specified effects produced by the flotation agents
- B03D2201/02—Collectors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2201/00—Specified effects produced by the flotation agents
- B03D2201/04—Frothers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
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- B03D2203/02—Ores
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Abstract
The invention discloses a bridge traction induction beneficiation method for copper-nickel sulfide ores, which mainly comprises the steps of preparing strong floatable concentrate serving as a bridge traction medium in the existing beneficiation process, and respectively adding the strong floatable concentrate into the beneficiation process to optimize the beneficiation index after treating the strong floatable concentrate. Aiming at the problems of poor separation selectivity of the existing conventional flotation on the nonferrous metal micro-fine minerals and the like in the field of nonferrous metal mineral separation, the invention remarkably improves the copper or nickel ore flotation recovery rate of each operation section by adding the strong floatable concentrate in the two-section roughing, the two-section primary refining and the two-section fine scavenging; the adoption of the strong floatability concentrate bridge to pull the fine-fraction minerals with more content in the two-stage flotation process can reduce the medicament consumption of the two-stage flotation process, improve the separation efficiency of the two stages and create conditions for improving the recovery rate of nickel and copper metals.
Description
Technical Field
The invention relates to the technical field of nonferrous metal mineral beneficiation, in particular to a bridge traction induced beneficiation method for copper-nickel sulfide ores.
Background
The total amount of nonferrous metal resources in China is rich, but the ore grade is low, and the composition of the ore has the characteristics of more lean ores, less rich ores, less single ores and more associated ores, so that the efficient recovery is difficult. The continuous reduction of easily-selected coarse-grained mineral resources leads to the high-efficiency separation of low-grade fine-embedded minerals. When flotation is carried out on some mineral seeds, the content of micro-fine mineral particles is more, and the micro-fine mineral particles are characterized by small mass and large specific surface area, so that the probability of collision mineralization of particles and bubbles is low, the entrainment of gangue particle water flow is serious, the conventional flotation separation selectivity is poor, and ideal indexes are difficult to obtain.
The research work in the prior art on fine-grained ores has mainly focused on flotation technology and fine-grained flotation equipment. On one hand, the larger length-diameter ratio of the flotation machine in the flotation equipment makes the production operation very inconvenient, and the longer moving distance and residence time of the micro-fine particles in the column body can increase the oxidation degree. The strong turbulence of the pulp of a centrifugal field flotation machine can lead to difficult control of the flotation behaviour etc., and therefore the micro-particle flotation equipment is not suitable for use in already put into production in a factory. On the other hand, the micro-particle flotation technology comprises a series of methods such as vacuum micro-bubble flotation, nano collector flotation, microorganism leaching and the like, but the method has low adaptability to micro-particle ore pulp, and has the problems of high medicament consumption, low concentrate grade and the like. Therefore, these techniques are difficult to be widely popularized and applied in practical production. To solve the practical problem of recycling of fine-grained minerals, new breakthroughs are urgently required in terms of technology, cost, product quality and the like.
The characteristics of the micro-fine ore such as large specific surface area, high surface energy and the like lead to poor particle selectivity in the flotation process. The activated coarse particles and the fine particles approach each other, collide and adhere to each other under the strong turbulence condition by adding the activated coarse particles, and finally the activated coarse particles float up along with the bubbles. Therefore, the added activated coarse particles form a bridge traction effect between the two sections of the difficultly-floated particles and the bubbles, so that the mineral with the difficultly-floated fine particles floats upwards along with the bubbles.
Disclosure of Invention
The invention aims to provide a bridge traction induced beneficiation method for copper-nickel sulfide ores, so as to optimize the flotation effect of difficult-to-float fine-grain minerals in the two-stage flotation process and improve the recovery rate of nickel and copper metals.
A bridge traction induction beneficiation method for copper-nickel sulfide ores comprises the following steps:
bridge traction medium preparation
(1) Adding a collector ethyl xanthate into the ore pulp: 130-150 g/t and 40-60 g/t of a foaming agent, stirring for 10-20 min, and then performing preferential flotation operation for 5-6 min to obtain flotation rough concentrate and flotation tailings, wherein the yield of the flotation rough concentrate is 10% -15%; the ore pulp is copper nickel sulfide ore pulp with the concentration of 20% -24% and the particle size fraction of-0.074 mm content of 65% -70%.
(2) And (3) carrying out one-stage classification operation on the flotation rough concentrate obtained in the step (1) through a cyclone to obtain +0.046mm size-fraction concentrate, 0.030mm-0.046mm size-fraction concentrate and-0.030 mm size-fraction concentrate.
(3) And (3) carrying out primary roughing operation on the flotation tailings obtained in the step (1) through a flotation machine, wherein the flotation concentration is 22% -24%, the flotation time is 15-20 min, and primary roughing concentrate and primary roughing tailings are obtained.
(4) Combining the +0.046mm size-grade concentrate and the-0.030 mm size-grade concentrate obtained in the step (2) and the first-stage roughing concentrate obtained in the step (3), and then carrying out first-stage primary concentration operation by a flotation machine, wherein the flotation concentration is 18% -20%, and the flotation time is 15-20 min, so as to obtain first-stage primary concentration concentrate and first-stage primary concentration tailings.
(5) And (3) carrying out primary secondary concentration operation on the primary concentrated concentrate obtained in the step (4) through a flotation machine, wherein the flotation concentration is 18% -20%, the flotation time is 15-20 min, and the high-grade concentrate and primary secondary concentration tailings are obtained, and the primary secondary concentration tailings return to the primary concentration operation.
(6) Adding a collector Z200 into the 0.030mm-0.046 mm size-fraction concentrate obtained in the step (2): and (3) stirring for 3-5 minutes to obtain the concentrate with strong floatability at 20-30 g/t.
Bridge traction induction ore dressing
(7) And combining the first-stage roughing tailings and the first-stage primary concentrating tailings to perform two-stage classification operation, so that the sediment with the concentration of 80-85% in the size fraction of 0.074mm and the concentration of 18-20% in the overflow and the concentration of 15-20% in the size fraction of 0.074mm and the concentration of 60-65% in the sediment are obtained.
(8) Adding the strongly floatable concentrate obtained in the step (6) into the overflow obtained in the step (7), stirring for 3-5 min, and then performing secondary roughing operation through a flotation machine, wherein the flotation concentration is 18% -20%, and the flotation time is 20-25 min, so as to obtain secondary roughing concentrate and secondary roughing tailings; the addition amount of the strong floatability concentrate is 10% -15% of the dry ore amount in the two-stage roughing operation.
(9) Adding the strongly floatable concentrate obtained in the step (6) into the two-stage roughing concentrate obtained in the step (8), stirring for 3-5 min, and then carrying out two-stage primary concentration operation by a flotation machine, wherein the flotation concentration is 15-18%, and the flotation time is 25-30 min, so as to obtain two-stage primary concentration concentrate and two-stage primary concentration tailings; the addition amount of the strong floatability concentrate is 10% -15% of the dry ore amount in the two-stage primary concentration operation.
(10) And (3) carrying out secondary primary scavenging operation on the secondary roughing tailings obtained in the step (8) through a flotation machine, wherein the flotation concentration is 16% -18%, and the flotation time is 10-15 min, so as to obtain secondary primary scavenging concentrate and secondary primary scavenging tailings.
(11) And (3) sequentially carrying out secondary concentration operation and secondary and tertiary concentration operation on the secondary concentrated concentrate in the step (9) to finally obtain low-grade concentrate, wherein the secondary concentrated tailings return to the secondary primary concentration operation, and the tertiary concentrated tailings return to the secondary concentration operation.
And the second-stage secondary concentration operation adopts a flotation machine for operation, the flotation concentration is 15-20%, and the flotation time is 10-15 min. And carrying out two-stage and three-time selection operation by adopting a flotation machine, wherein the flotation concentration is 15-20%, and the flotation time is 10-15 min.
(12) Stirring and mixing the second-stage primary concentration tailings obtained in the step (9) with the strong floatability concentrate obtained in the step (6) for 3-5 min, and then adopting a flotation machine to perform second-stage fine scavenging operation, wherein the flotation concentration is 15% -18%, and the flotation time is 10-15 min, so as to obtain second-stage fine scavenging concentrate and second-stage fine scavenging tailings, wherein the second-stage fine scavenging concentrate returns to the second-stage primary concentration operation, and the second-stage fine scavenging tailings and the second-stage primary scavenging concentrate are combined and return to the second-stage classification operation; the addition amount of the strong floatability concentrate is 10% -15% of the dry ore amount in the two-stage fine scavenging operation.
(13) And (3) carrying out secondary scavenging operation on the secondary primary scavenging tailings obtained in the step (10) by adopting a flotation machine, wherein the flotation concentration is 16% -18%, the flotation time is 10-15 min, and the secondary scavenging concentrate and the final tailings are obtained.
(14) Grinding the sand obtained in the step (7) and returning to the second stage classification operation, wherein the ground sand has a granularity of-0.074 mm and a granularity of 65% -70%.
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention adopts the concentrate with specific size fraction in the existing flow as a bridge traction medium, has simple process, small site implementation change and low production and operation cost;
(2) The two-stage flotation with larger content of micro-particles has higher consumption of chemicals and unit, and the two-stage bridge traction flotation is performed by using the concentrate with strong floatability, so that the consumption of chemicals is obviously reduced;
(3) All bridge traction media are generated in the self flow, the flotation process does not generate secondary pollution, and other media do not need to be added additionally.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The invention is further illustrated by the following description in conjunction with the accompanying drawings and specific embodiments.
Example 1
The copper-nickel sulfide ore is ground and graded to the size fraction of-0.074 mm with the size fraction content of 65 percent by a ball mill, the ore pulp concentration is 20 percent, and the ore pulp is subjected to the preferential flotation operation.
(1) Adding a collector ethyl xanthate into the ore pulp: 130g/t and 40g/t of a foaming agent, stirring for 10min, and then performing preferential flotation operation for 5min to obtain flotation rough concentrate and flotation tailings, wherein the yield of the flotation rough concentrate is 10%;
(2) And (3) carrying out one-stage classification operation on the flotation rough concentrate obtained in the step (1) through a cyclone to obtain +0.046mm size-fraction concentrate, 0.030mm-0.046mm size-fraction concentrate and-0.030 mm size-fraction concentrate.
(3) And (3) carrying out primary roughing operation on the flotation tailings obtained in the step (1) through a flotation machine, wherein the flotation concentration is 20%, the flotation time is 15min, and primary roughing concentrate and primary roughing tailings are obtained.
(4) Combining the +0.046mm size-grade concentrate obtained in the step (2) and the-0.030 mm size-grade concentrate and the first-stage roughing concentrate obtained in the step (3), and then carrying out first-stage primary concentration operation by a flotation machine, wherein the flotation concentration is 18%, and the flotation time is 22min, so as to obtain first-stage primary concentration concentrate and first-stage primary concentration tailings.
(5) And (3) carrying out primary secondary concentration operation on the primary concentrated concentrate obtained in the step (4) through a flotation machine, wherein the flotation concentration is 18%, the flotation time is 16min, and high-grade concentrate and primary secondary concentration tailings are obtained, and the primary secondary concentration tailings return to the primary concentration operation.
(6) Adding a collector Z200 into the 0.030mm-0.046 mm size-fraction concentrate obtained in the step (2): 20g/t, and stirring for 3 minutes to obtain the concentrate with strong floatability.
(7) And combining the first-stage roughing tailings and the first-stage primary concentrating tailings to perform a second-stage classification operation, thereby obtaining the sand setting with-0.074 mm particle size accounting for 80%, 18% overflow and-0.074 mm particle size accounting for 20% and 60%.
(8) Adding the strong floatability concentrate obtained in the step (6) into the overflow obtained in the step (7) and stirring for 3min, and then performing secondary roughing operation through a flotation machine, wherein the flotation concentration is 18%, and the flotation time is 20min, so as to obtain secondary roughing concentrate and secondary roughing tailings; the addition amount of the strong floatability concentrate is 10% of the dry ore amount in the two-stage roughing operation.
(9) Adding the strong floatability concentrate obtained in the step (6) into the second-stage roughing concentrate obtained in the step (8), stirring for 3-5 min, and then carrying out second-stage primary concentration operation through a flotation machine, wherein the flotation concentration is 15%, and the flotation time is 26min, so as to obtain second-stage primary concentration concentrate and second-stage primary concentration tailings; the addition amount of the strong floatability concentrate is 10% of the dry ore amount in the two-stage primary concentration operation.
(10) And (3) carrying out secondary primary scavenging operation on the secondary roughing tailings obtained in the step (8) through a flotation machine, wherein the flotation concentration is 16%, and the flotation time is 12min, so as to obtain secondary primary scavenging concentrate and secondary primary scavenging tailings.
(11) And (3) sequentially carrying out secondary concentration operation (flotation concentration is 16%) and tertiary concentration operation (flotation concentration is 17%) on the secondary primary concentrate in the step (9), and finally obtaining low-grade concentrate, wherein the secondary concentration tailings return to the secondary primary concentration operation, and the tertiary concentration tailings return to the secondary concentration operation.
(12) Stirring and mixing the second-stage primary concentration tailings obtained in the step (9) and the strong floatable concentrate obtained in the step (6) for 3min, and then adopting a flotation machine to perform second-stage fine scavenging operation, wherein the flotation concentration is 15%, and the flotation time is 13min, so as to obtain second-stage fine scavenging concentrate and second-stage fine scavenging tailings, wherein the second-stage fine scavenging concentrate returns to the second-stage primary concentration operation, and the second-stage fine scavenging tailings and the second-stage primary scavenging concentrate are combined and return to the second-stage classification operation; the addition amount of the strong floatability concentrate is 10% of the dry ore amount in the two-stage fine scavenging operation.
(13) And (3) carrying out secondary scavenging operation on the secondary primary scavenging tailings obtained in the step (10) by adopting a flotation machine, wherein the flotation concentration is 16%, the flotation time is 12min, and the secondary scavenging concentrate and the final tailings are obtained, and the secondary scavenging concentrate returns to the secondary primary scavenging operation.
(14) Grinding the sand obtained in the step (7) and returning to the second-stage classification operation.
The results of the beneficiation test are shown in table 1 below:
table 1 comparison of the results of the two-stage beneficiation in example 1
From the test results, it can be seen that: in the second-stage ore dressing process, because the strong floatable concentrate is added as a bridging medium, the recovery rate of nickel and copper in the low-grade concentrate is improved compared with the ore dressing result without the bridging medium.
Example 2
The copper-nickel sulfide ore is ground and graded to the size fraction content of-0.074 mm by a ball mill, the ore pulp concentration is 22%, and the ore pulp is subjected to the preferential flotation operation.
(1) Adding a collector ethyl xanthate into the ore pulp: 140g/t and 50g/t of a foaming agent, stirring for 15min, and then performing preferential flotation operation for 5min to obtain flotation rough concentrate and flotation tailings, wherein the yield of the flotation rough concentrate is 13%;
(2) And (3) carrying out one-stage classification operation on the flotation rough concentrate obtained in the step (1) through a cyclone to obtain +0.046mm size-fraction concentrate, 0.030mm-0.046mm size-fraction concentrate and-0.030 mm size-fraction concentrate.
(3) And (3) carrying out primary roughing operation on the flotation tailings obtained in the step (1) through a flotation machine, wherein the flotation concentration is 22%, and the flotation time is 18min, so as to obtain primary roughing concentrate and primary roughing tailings.
(4) Combining the +0.046mm size-grade concentrate obtained in the step (2) and the-0.030 mm size-grade concentrate and the first-stage roughing concentrate obtained in the step (3), and then carrying out first-stage primary concentration operation by a flotation machine, wherein the flotation concentration is 20%, and the flotation time is 22min, so as to obtain first-stage primary concentration concentrate and first-stage primary concentration tailings.
(5) And (3) carrying out primary secondary concentration operation on the primary concentrated concentrate obtained in the step (4) through a flotation machine, wherein the flotation concentration is 18%, the flotation time is 16min, and high-grade concentrate and primary secondary concentration tailings are obtained, and the primary secondary concentration tailings return to the primary concentration operation.
(6) Adding a collector Z200 into the 0.030mm-0.046 mm size-fraction concentrate obtained in the step (2): 25g/t, and stirring for 4 minutes to obtain the concentrate with strong floatability.
(7) And combining the first-stage roughing tailings and the first-stage primary concentrating tailings to perform a second-stage classification operation, thereby obtaining the sand setting with the concentration of-0.074 mm accounting for 85%, the overflow with the concentration of 20% accounting for 15% and the concentration of-0.074 mm accounting for 62%.
(8) Adding the strong floatability concentrate obtained in the step (6) into the overflow obtained in the step (7), stirring for 3-5 min, and then performing secondary roughing operation through a flotation machine, wherein the flotation concentration is 20%, and the flotation time is 20min, so as to obtain secondary roughing concentrate and secondary roughing tailings; the addition amount of the strong floatability concentrate is 10% of the dry ore amount in the two-stage roughing operation.
(9) Adding the strong floatability concentrate obtained in the step (6) into the second-stage roughing concentrate obtained in the step (8), stirring for 4min, and then carrying out second-stage primary concentration operation by a flotation machine, wherein the flotation concentration is 18%, and the flotation time is 26min, so as to obtain second-stage primary concentration concentrate and second-stage primary concentration tailings; the addition amount of the strong floatability concentrate is 10% of the dry ore amount in the two-stage primary concentration operation.
(10) And (3) carrying out secondary primary scavenging operation on the secondary roughing tailings obtained in the step (8) through a flotation machine, wherein the flotation concentration is 18%, and the flotation time is 23min, so as to obtain secondary primary scavenging concentrate and secondary primary scavenging tailings.
(11) And (3) sequentially carrying out secondary concentration operation (flotation concentration is 15%) and tertiary concentration operation (flotation concentration is 18%) on the secondary primary concentrate in the step (9), and finally obtaining low-grade concentrate, wherein the secondary concentration tailings return to the secondary primary concentration operation, and the tertiary concentration tailings return to the secondary concentration operation.
(12) Stirring and mixing the second-stage primary concentration tailings obtained in the step (9) with the strong floatable concentrate obtained in the step (6) for 4min, and then adopting a flotation machine to perform second-stage fine scavenging operation, wherein the flotation concentration is 18%, and the flotation time is 13min, so as to obtain second-stage fine scavenging concentrate and second-stage fine scavenging tailings, wherein the second-stage fine scavenging concentrate returns to the second-stage primary concentration operation, and the second-stage fine scavenging tailings and the second-stage primary scavenging concentrate are combined and return to the second-stage classification operation; the addition amount of the strong floatability concentrate is 10% of the dry ore amount in the two-stage fine scavenging operation.
(13) And (3) carrying out secondary scavenging operation on the secondary primary scavenging tailings obtained in the step (10) by adopting a flotation machine, wherein the flotation concentration is 18%, the flotation time is 12min, and the secondary scavenging concentrate and the final tailings are obtained, and the secondary scavenging concentrate returns to the secondary primary scavenging operation.
(14) Grinding the sand obtained in the step (7) and returning to the second-stage classification operation.
The beneficiation results are shown in the following Table 2
Table 2 comparison of the results of the two-stage beneficiation in example 2
From the test results, it can be seen that: in the second-stage ore dressing process, because the strong floatable concentrate is added as a bridging medium, the recovery rate of nickel and copper in the low-grade concentrate is improved compared with the ore dressing result without the bridging medium.
Example 3
The copper nickel sulfide ore is ground and graded to 70 percent of-0.074 mm grain grade content by a ball mill, the ore pulp concentration is 24 percent, and the ore pulp is subjected to preferential flotation.
(1) Adding a collector ethyl xanthate into the ore pulp: 150g/t and 60g/t of a foaming agent, stirring for 20min, and then performing preferential flotation operation for 6min to obtain flotation rough concentrate and flotation tailings, wherein the yield of the flotation rough concentrate is 15%;
(2) And (3) carrying out one-stage classification operation on the flotation rough concentrate obtained in the step (1) through a cyclone to obtain +0.046mm size-fraction concentrate, 0.030mm-0.046mm size-fraction concentrate and-0.030 mm size-fraction concentrate.
(3) And (3) carrying out primary roughing operation on the flotation tailings obtained in the step (1) through a flotation machine, wherein the flotation concentration is 24%, and the flotation time is 20min, so as to obtain primary roughing concentrate and primary roughing tailings.
(4) Combining the +0.046mm size-grade concentrate obtained in the step (2) and the-0.030 mm size-grade concentrate and the first-stage roughing concentrate obtained in the step (3), and then carrying out first-stage primary concentration operation by a flotation machine, wherein the flotation concentration is 20%, and the flotation time is 18min, so as to obtain first-stage primary concentration concentrate and first-stage primary concentration tailings.
(5) And (3) carrying out primary secondary concentration operation on the primary concentrated concentrate obtained in the step (4) through a flotation machine, wherein the flotation concentration is 20%, the flotation time is 18min, and high-grade concentrate and primary secondary concentration tailings are obtained, and the primary secondary concentration tailings return to the primary concentration operation.
(6) Adding a collector Z200 into the 0.030mm-0.046 mm size-fraction concentrate obtained in the step (2): 30g/t, and stirring for 5 minutes to obtain the concentrate with strong floatability.
(7) And combining the first-stage roughing tailings and the first-stage primary concentrating tailings to perform a second-stage classification operation, thereby obtaining the sand setting with the concentration of-0.074 mm accounting for 85%, the overflow with the concentration of 20% accounting for 15% and the concentration of-0.074 mm accounting for 65%.
(8) Adding the strongly floatable concentrate obtained in the step (6) into the overflow obtained in the step (7) and stirring for 5min, and then performing secondary roughing operation through a flotation machine, wherein the flotation concentration is 20%, and the flotation time is 25min, so as to obtain secondary roughing concentrate and secondary roughing tailings; the addition amount of the strong floatability concentrate is 15% of the dry ore amount in the two-stage roughing operation.
(9) Adding the strong floatability concentrate obtained in the step (6) into the second-stage roughing concentrate obtained in the step (8) and stirring for 5min, and then carrying out second-stage primary concentration operation by a flotation machine, wherein the flotation concentration is 18%, and the flotation time is 27min, so as to obtain second-stage primary concentration concentrate and second-stage primary concentration tailings; the addition amount of the strong floatability concentrate is 15% of the dry ore amount in the two-stage primary concentration operation.
(10) And (3) carrying out secondary primary scavenging operation on the secondary roughing tailings obtained in the step (8) through a flotation machine, wherein the flotation concentration is 18%, and the flotation time is 23min, so as to obtain secondary primary scavenging concentrate and secondary primary scavenging tailings.
(11) And (3) sequentially carrying out secondary concentration operation (flotation concentration of 20%) and tertiary concentration operation (flotation concentration of 20%) on the secondary primary concentrate in the step (9), and finally obtaining low-grade concentrate, wherein the secondary concentration tailings return to the secondary primary concentration operation, and the tertiary concentration tailings return to the secondary concentration operation.
(12) Stirring and mixing the second-stage primary concentration tailings obtained in the step (9) and the strong floatable concentrate obtained in the step (6) for 5min, and then adopting a flotation machine to perform second-stage fine scavenging operation, wherein the flotation concentration is 18%, and the flotation time is 12min, so as to obtain second-stage fine scavenging concentrate and second-stage fine scavenging tailings, wherein the second-stage fine scavenging concentrate returns to the second-stage primary concentration operation, and the second-stage fine scavenging tailings and the second-stage primary scavenging concentrate are combined and return to the second-stage classification operation; the addition amount of the strong floatability concentrate is 15% of the dry ore amount in the two-stage fine scavenging operation.
(13) And (3) carrying out secondary scavenging operation on the secondary primary scavenging tailings obtained in the step (10) by adopting a flotation machine, wherein the flotation concentration is 18%, the flotation time is 13min, and the secondary scavenging concentrate and the final tailings are obtained, and the secondary scavenging concentrate returns to the secondary primary scavenging operation.
(14) Grinding the sand obtained in the step (7) and returning to the second-stage classification operation.
The beneficiation results are shown in table 3 below:
table 3 comparison of the results of the two-stage beneficiation in example 3
From the test results, it can be seen that: in the second-stage ore dressing process, because the strong floatable concentrate is added as a bridging medium, the recovery rate of nickel and copper in the low-grade concentrate is improved compared with the ore dressing result without the bridging medium.
Claims (7)
1. The bridge traction induced beneficiation method for the copper-nickel sulfide ore is characterized by comprising the following steps of:
bridge traction medium preparation
(1) Adding a collector ethyl xanthate into the ore pulp: 130-150 g/t and 40-60 g/t of a foaming agent, stirring for 10-20 min, and then performing preferential flotation operation for 5-6 min to obtain flotation rough concentrate and flotation tailings, wherein the yield of the flotation rough concentrate is 10% -15%;
(2) Carrying out one-stage classification operation on the flotation rough concentrate obtained in the step (1) through a cyclone to obtain +0.046mm size-fraction concentrate, 0.030mm-0.046mm size-fraction concentrate and-0.030 mm size-fraction concentrate;
(3) Carrying out primary roughing operation on the flotation tailings obtained in the step (1) through a flotation machine, wherein the flotation concentration is 22% -24%, and the flotation time is 15-20 min, so as to obtain primary roughing concentrate and primary roughing tailings;
(4) Combining the +0.046mm size-grade concentrate and the-0.030 mm size-grade concentrate obtained in the step (2) and the first-stage roughing concentrate obtained in the step (3), and then carrying out first-stage primary concentration operation by a flotation machine, wherein the flotation concentration is 18% -20%, and the flotation time is 20% -25 min, so as to obtain first-stage primary concentration concentrate and first-stage primary concentration tailings;
(5) Carrying out primary secondary concentration operation on the primary concentrated concentrate obtained in the step (4) through a flotation machine, wherein the flotation concentration is 18% -20%, the flotation time is 15-20 min, and obtaining high-grade concentrate and primary secondary concentration tailings, wherein the primary secondary concentration tailings return to the primary concentration operation;
(6) Adding a collector Z200 into the 0.030mm-0.046 mm size-fraction concentrate obtained in the step (2): 20-30 g/t, and stirring for 3-5 minutes to obtain strong floatability concentrate;
bridge traction induction ore dressing
(7) Combining the first-stage roughing tailings and the first-stage primary concentrating tailings for two-stage classification operation to obtain overflow with the particle size of-0.074 mm accounting for 80-85% and the concentration of 18-20% and sand setting with the concentration of 60-65%;
(8) Adding the strongly floatable concentrate obtained in the step (6) into the overflow obtained in the step (7), stirring for 3-5 min, and then performing secondary roughing operation through a flotation machine, wherein the flotation concentration is 18% -20%, and the flotation time is 20-25 min, so as to obtain secondary roughing concentrate and secondary roughing tailings;
(9) Adding the strongly floatable concentrate obtained in the step (6) into the two-stage roughing concentrate obtained in the step (8), stirring for 3-5 min, and then carrying out two-stage primary concentration operation by a flotation machine, wherein the flotation concentration is 15-18%, and the flotation time is 25-30 min, so as to obtain two-stage primary concentration concentrate and two-stage primary concentration tailings;
(10) Carrying out secondary primary scavenging operation on the secondary roughing tailings obtained in the step (8) through a flotation machine, wherein the flotation concentration is 16% -18%, and the flotation time is 10-15 min, so as to obtain secondary primary scavenging concentrate and secondary primary scavenging tailings;
(11) Sequentially carrying out secondary concentration operation and secondary and tertiary concentration operation on the secondary concentrated concentrate in the step (9) to finally obtain low-grade concentrate, wherein the secondary concentrated tailings return to the secondary primary concentration operation, and the tertiary concentrated tailings return to the secondary concentration operation;
(12) Stirring and mixing the second-stage primary concentration tailings obtained in the step (9) with the strong floatability concentrate obtained in the step (6) for 3-5 min, and then adopting a flotation machine to perform second-stage fine scavenging operation, wherein the flotation concentration is 15% -18%, and the flotation time is 10-15 min, so as to obtain second-stage fine scavenging concentrate and second-stage fine scavenging tailings, wherein the second-stage fine scavenging concentrate returns to the second-stage primary concentration operation, and the second-stage fine scavenging tailings and the second-stage primary scavenging concentrate are combined and return to the second-stage classification operation;
(13) Carrying out secondary scavenging operation on the secondary scavenging tailings obtained in the step (10) by adopting a flotation machine, wherein the flotation concentration is 16% -18%, the flotation time is 10-15 min, and obtaining secondary scavenging concentrate and final tailings, wherein the secondary scavenging concentrate returns to the secondary scavenging operation;
(14) Grinding the sand obtained in the step (7) and returning to the second stage classification operation, wherein the particle size of-0.074 mm accounts for 65-70% of the particle size after grinding.
2. The bridge traction induction beneficiation method for copper-nickel sulfide ores, according to claim 1, is characterized in that: the ore pulp in the step (1) is copper nickel sulfide ore pulp with the concentration of 20% -24% and the fraction content of-0.074 mm of 65% -70%.
3. The bridge traction induction beneficiation method for copper-nickel sulfide ores, according to claim 1, is characterized in that: in the step (8), the addition amount of the strong floatability concentrate is 10% -15% of the dry ore amount in the two-stage roughing operation.
4. The bridge traction induction beneficiation method for copper-nickel sulfide ores, according to claim 1, is characterized in that: in the step (9), the addition amount of the strong floatability concentrate is 10% -15% of the dry ore amount in the two-stage primary concentration operation.
5. The bridge traction induction beneficiation method for copper-nickel sulfide ores, according to claim 1, is characterized in that: in the step (11), the second-stage secondary fine selection operation adopts a flotation machine operation, the flotation concentration is 15% -20%, and the flotation time is 10-15 min.
6. The bridge traction induction beneficiation method for copper-nickel sulfide ores, according to claim 1, is characterized in that: in the step (11), the two-stage and three-time fine selection operation is performed by adopting a flotation machine, the flotation concentration is 15% -20%, and the flotation time is 10-15 min.
7. The bridge traction induction beneficiation method for copper-nickel sulfide ores, according to claim 1, is characterized in that: in the step (12), the addition amount of the strong floatability concentrate is 10% -15% of the dry ore amount in the two-stage fine scavenging operation.
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| US4283017A (en) * | 1979-09-07 | 1981-08-11 | Amax Inc. | Selective flotation of cubanite and chalcopyrite from copper/nickel mineralized rock |
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