Beneficiation method for high-matte-grade copper smelting slag

Abstract

The invention discloses a beneficiation method for high-matte-grade copper smelting slag, and relates to the technical field of metallurgy and mineral processing, and the beneficiation method specifically comprises the following steps: step 1, firstly, crushing to-be-treated copper smelting slag through three crushing stages of coarse crushing, intermediate crushing and fine crushing to obtain a primarily-processed copper smelting slag ore sample; and 2, transporting the ore sample obtained in the last step of crushing in the step 1 to a ball mill through a belt, carrying out first-stage ore grinding, and feeding ore pulp obtained after treatment of the ball mill into a first-stage cyclone through a slurry pump for grading to obtain an overflow product and settled sand. Wherein the ore pulp meeting the fineness requirement is called an overflow product, and the ore pulp not meeting the fineness requirement is called settled sand. Through multiple times of ore grinding and flotation, the treatment capacity is improved, the ore grinding fineness of an ore sample is increased, the service time of a lining plate of the ball mill is prolonged, multiple times of scavenging are conducted in the flotation process, the flotation time is prolonged, the flotation index is improved, and the technological process is optimized and improved.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgy and mineral processing, and in particular to a method for beneficiating high-matte grade copper smelting slag. Background Art

[0002] Copper is one of the basic industrial raw materials for the development of modern economy. Due to its good electrical and thermal conductivity, wear resistance, ductility and plasticity, it is widely used in electronics, transportation equipment, machinery manufacturing, energy transportation and construction industries as well as high-tech fields.

[0003] As the demand and output of copper increase rapidly, the amount of slag stockpiled during copper smelting has also increased year by year, which not only puts pressure on environmental governance, but also causes a waste of copper resources, directly affecting the economic benefits of enterprises. At present, through the detection of important elements and their contents in high-matte copper smelting slag, and the detection and analysis of the physical phase of the smelting slag, it is found that the main components of copper smelting slag are: the vast majority of copper minerals are matte, with trace amounts of arsenic-copper alloys, metallic copper, etc., the vast majority of metal oxides are magnetite, with trace amounts of sphalerite, galena, metallic iron, arsenic-iron alloys, etc., non-metallic minerals are mainly fayalite, followed by calcium iron silicate and iron aluminum silicate, trace amounts of diopside, muscovite, potassium feldspar, quartz, etc. As for the treatment of copper smelting slag, in the past, copper smelting slag was mainly selected through processes such as ore crushing + two-stage grinding + flotation;

[0004] However, the ore ground by this process is coarse and the monomer dissociation degree of the ore sample is low, resulting in poor flotation effect and less than ideal beneficiation indicators. Therefore, a better beneficiation method is crucial for copper smelting slag with high matte grade. For this purpose, we proposed a beneficiation method for copper smelting slag with high matte grade. Summary of the invention

[0005] The present invention provides a method for beneficiating high-matte grade copper smelting slag, which solves the problems raised by the above-mentioned background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: A method for beneficiating high matte grade copper smelting slag, comprising the following steps:

[0007] Step 1: First, the copper smelting slag to be processed is crushed through three crushing stages: coarse crushing, medium crushing, and fine crushing to obtain a primary processed copper smelting slag ore sample;

[0008] Step 2: The ore sample obtained in the last step of crushing in step 1 is transported to a ball mill via a belt for a first-stage grinding. The slurry obtained from the ball mill enters a first-stage cyclone for classification to obtain overflow products and sedimentation sand;

[0009] Step 3: the overflow product obtained in step 2 is fed into the second-stage grinding, the slurry obtained from the ball mill is fed into the second-stage cyclone for classification, and the overflow product and the sediment are obtained, and the sediment in step 2 is returned to the ball mill in the first-stage grinding for further grinding;

[0010] Step 4: the overflow product of step 3 enters the first stage flotation to obtain a copper concentrate product 1 and an underflow product of the first stage flotation, and the sediment produced in step 3 is returned to the ball mill in the second stage grinding to continue grinding;

[0011] Step 5: The underflow product of step 4 enters the third stage of grinding, and the slurry obtained from the ball mill enters the third stage of cyclone for classification to obtain overflow product and sedimentation sand;

[0012] Step 6: The overflow product of step 5 enters the second stage flotation to obtain the copper concentrate product 2 and the underflow product of the second stage flotation, and the sedimentation product of step 5 is returned to the ball mill in the third stage grinding to continue grinding;

[0013] Step 7: Performing a first scavenging on the underflow product of the second stage flotation in step 6 to obtain foam and underflow product, and the foam is returned to the second stage flotation in step 6;

[0014] Step 8: The underflow product in step 7 is subjected to a second scavenging to obtain foam and underflow product, and the foam is returned to the first scavenging in step 7;

[0015] Step 9: The bottom flow of step 8 is scavenged for the third time to obtain foam and tailings, and the foam is returned to the second scavenging of step 8;

[0016] The foam obtained after flotation in step 4 and step 6 is used as copper concentrate and enters the concentrate pool;

[0017] The tailings from step nine are used as the final tailings of the flotation process and enter the tailings pond.

[0018] As a preferred beneficiation method for high matte grade copper smelting slag of the present application, the fineness requirement of the first stage grinding is: -200 mesh 30%-45%, and the pulp concentration in the first stage grinding process is controlled at 30%-65%.

[0019] As a preferred beneficiation method for high matte grade copper smelting slag in the present application, the fineness requirement of the second stage grinding is: -200 mesh 60-80%, and the pulp concentration during the second stage grinding process is controlled at 15%-45%.

[0020] As a preferred beneficiation method for high matte grade copper smelting slag in the present application, the pH value in the first flotation process is 7-8, the dosage is controlled as follows: butyl sodium xanthate 100-180g / t, pine oil 100g / t, and the temperature in the first flotation process is: 40-60°C.

[0021] As a preferred beneficiation method for high matte grade copper smelting slag in the present application, the fineness requirement of the three-stage grinding is: -325 mesh 80%-90%, and the pulp concentration during the three-stage grinding process is 60%-80%.

[0022] As a preferred beneficiation method for high matte grade copper smelting slag in the present application, the pH value in the second-stage flotation process is 7-8, the dosage is controlled as follows: butyl sodium xanthate 100-180 g / t, pine oil 100 g / t, and the temperature in the second-stage flotation process is: 40-60°C.

[0023] As a preferred method for beneficiating high matte grade copper smelting slag of the present application, the control of the dosage is achieved by setting quantitative dosage points.

[0024] As a preferred beneficiation method for high matte grade copper smelting slag in the present application, the principle of controlling the amount of medicine at the quantitative dosing point is: a quantitative dosing device is installed on each branch pipeline to control the amount of medicine, that is, the amount of medicine is controlled by adjusting the flow rate of the quantitative dosing device.

[0025] The present invention has the following beneficial effects:

[0026] The beneficiation method of high-matte copper smelting slag increases the processing capacity and the grinding fineness of the ore sample by performing multiple grinding and flotation, prolongs the service life of the ball mill liner, performs multiple sweeping during the flotation process, prolongs the flotation time and improves the flotation index, and optimizes and improves the process flow;

[0027] Promoting it in copper smelting enterprises and non-ferrous metal beneficiation and other production industries will help improve the comprehensive resource utilization rate of copper smelting enterprises and have significant social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The process flow chart of the mineral processing method for this application;

[0029] Figure 2 This is a diagram showing the results of important element analysis of the samples of the present invention;

[0030] Figure 3 The chemical phase analysis diagram of copper in the sample of the present invention;

[0031] Figure 4 It is a particle size composition chart of the copper mineral aggregate of the present invention. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] The present invention provides a technical solution: a beneficiation method for high-matte grade copper smelting slag, comprising the following steps:

[0034] Step 1: First, the copper smelting slag to be processed is crushed through three crushing stages: coarse crushing, medium crushing, and fine crushing, and the final fineness reaches 8mm to obtain a primary processed copper smelting slag ore sample;

[0035] Step 2: The ore sample obtained in the last step of crushing in step 1 is transported to a ball mill via a belt for a first-stage grinding. The slurry obtained from the ball mill enters a first-stage cyclone for classification to obtain overflow products and sedimentation sand;

[0036] Step 3: the overflow product obtained in step 2 is fed into the second-stage grinding, the slurry obtained from the ball mill is fed into the second-stage cyclone for classification, and the overflow product and the sediment are obtained, and the sediment in step 2 is returned to the ball mill in the first-stage grinding for further grinding;

[0037] Step 4: the overflow product of step 3 enters the first stage flotation to obtain a copper concentrate product 1 and an underflow product of the first stage flotation, and the sediment produced in step 3 is returned to the ball mill in the second stage grinding to continue grinding;

[0038] Step 5: The underflow product of step 4 enters the third stage of grinding, and the slurry obtained from the ball mill enters the third stage of cyclone for classification to obtain overflow product and sedimentation sand;

[0039] Step 6: The overflow product of step 5 enters the second stage flotation to obtain the copper concentrate product 2 and the underflow product of the second stage flotation, and the sedimentation product of step 5 is returned to the ball mill in the third stage grinding to continue grinding;

[0040] Step 7: Performing a first scavenging on the underflow product of the second stage flotation in step 6 to obtain foam and underflow product, and the foam is returned to the second stage flotation in step 6;

[0041] Step 8: The underflow product in step 7 is subjected to a second scavenging to obtain foam and underflow product, and the foam is returned to the first scavenging in step 7;

[0042] Step 9: The bottom flow of step 8 is scavenged for the third time to obtain foam and tailings, and the foam is returned to the second scavenging of step 8;

[0043] The foam obtained after flotation in step 4 and step 6 is used as copper concentrate and enters the concentrate pool;

[0044] The tailings from step nine are used as the final tailings of the flotation process and enter the tailings pond.

[0045] Through the above steps one to nine, the grinding fineness of the ore sample is increased, the processing capacity can be increased, the service life of the ball mill liner is extended, the flotation time is extended, the flotation index is improved, and the process flow is optimized and improved; according to actual production, the service life of the second-stage grinding ball mill liner is increased from 12 months to 23 months, the processing capacity is increased by 1400t / d, the flotation time is extended, and the tailings index is reduced;

[0046] Promoting it in copper smelting enterprises and non-ferrous metal beneficiation and other production industries will help improve the comprehensive resource utilization rate of copper smelting enterprises and have significant social benefits.

[0047] The fineness requirement of the first-stage grinding is: -200 mesh 30%-45%, and the pulp concentration during the first-stage grinding process is controlled at 30%-65%.

[0048] The fineness requirement of the second-stage grinding is: -200 mesh 60-80%, and the pulp concentration during the second-stage grinding process is controlled at 15%-45%.

[0049] The pH value in the first stage of flotation is 7-8, the dosage is controlled as follows: 100-180 g / t of butyl sodium xanthate and 100 g / t of pine oil, and the temperature in the first stage of flotation is 40-60°C.

[0050] The fineness requirement of the three-stage grinding is: -325 mesh 80%-90%, and the pulp concentration during the three-stage grinding process is 60%-80%.

[0051] The pH value during the second stage flotation process is 7-8, the dosage is controlled as follows: 100-180 g / t of butyl sodium xanthate, 100 g / t of pine oil, and the temperature during the second stage flotation process is 40-60°C.

[0052] The control of the dosage is achieved by setting quantitative dosage points.

[0053] The principle of controlling the amount of medicine at the quantitative dosing point is: installing a quantitative dosing device on each branch pipeline to control the amount of medicine, that is, controlling the amount of medicine by adjusting the flow rate of the quantitative dosing device.

[0054] The process flow of the present application increases the processing capacity, prolongs the service life of the liner of the second-stage grinding ball mill, prolongs the flotation time and improves the flotation index.

[0055] In actual production, the ore grade, concentrate grade and tailings grade are usually used to calculate the mineral processing recovery rate. The calculation formula is:

[0056] Copper recovery rate (%) = (β(α-θ)) / (α(β-θ))*100%;

[0057] Where: α-ore grade (%), β-concentrate grade (%), θ-tailings grade (%);

[0058] In this embodiment, it is calculated that the copper recovery rate reaches 95.2%, which is a good effect and is 1.2% higher than before the transformation.

[0059] The instruction manual is attached Figure 2 The important element composition and content analysis results of high-matte grade copper smelting slag ore;

[0060] Instructions attached Figure 3 The content and occupancy of metallic copper and copper sulfide in the slag sample with a diameter of -0.038 mm accounting for 90%, that is, the chemical phase analysis of copper in the sample;

[0061] Instructions attached Figure 4 The distribution relationship between matte, arsenic copper alloy and metallic copper in the smelting slag is relatively close, and the particle size composition of copper mineral aggregates is Figure 4 It can be seen that the distribution particle size of copper mineral aggregates is concentrated in 0.01mm-0.074mm. In the -0.01mm particle size, the occupancy rate of copper mineral aggregates is 4.45%, that is: the particle size composition table of copper mineral aggregates.

[0062] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. Machinery, parts and equipment all adopt conventional models in the prior art and will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field. Although the embodiments of the present invention have been shown and described, it can be understood by ordinary technicians in this field that various changes, modifications, substitutions and modifications can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for beneficiating high matte grade copper smelting slag, characterized by: The following steps are involved: Step 1: First, the copper smelting slag to be processed is crushed through three crushing stages: coarse crushing, medium crushing, and fine crushing to obtain a primary processed copper smelting slag ore sample; Step 2: The ore sample obtained in the last step of crushing in step 1 is transported to a ball mill via a belt for a first-stage grinding. The slurry obtained from the ball mill enters a first-stage cyclone for classification to obtain overflow products and sedimentation sand; Step 3: the overflow product obtained in step 2 is fed into the second-stage grinding, the slurry obtained from the ball mill is fed into the second-stage cyclone for classification, and the overflow product and the sediment are obtained, and the sediment in step 2 is returned to the ball mill in the first-stage grinding for further grinding; Step 4: the overflow product of step 3 enters the first stage flotation to obtain a copper concentrate product 1 and an underflow product of the first stage flotation, and the sediment produced in step 3 is returned to the ball mill in the second stage grinding to continue grinding; Step 5: The underflow product of step 4 enters the third stage of grinding, and the slurry obtained from the ball mill enters the third stage of cyclone for classification to obtain overflow product and sedimentation sand; Step 6: The overflow product of step 5 enters the second stage flotation to obtain the copper concentrate product 2 and the underflow product of the second stage flotation, and the sedimentation product of step 5 is returned to the ball mill in the third stage grinding to continue grinding; Step 7: Performing a first scavenging on the underflow product of the second stage flotation in step 6 to obtain foam and underflow product, and the foam is returned to the second stage flotation in step 6; Step 8: The underflow product in step 7 is subjected to a second scavenging to obtain foam and underflow product, and the foam is returned to the first scavenging in step 7; Step 9: The bottom flow of step 8 is scavenged for the third time to obtain foam and tailings, and the foam is returned to the second scavenging of step 8; The foam obtained after flotation in step 4 and step 6 is used as copper concentrate and enters the concentrate pool; The tailings from step nine are used as the final tailings of the flotation process and enter the tailings pond.

2. The method for beneficiating high matte grade copper smelting slag according to claim 1, characterized in that: The fineness requirement of the first-stage grinding is: -200 mesh 30%-45%, and the pulp concentration during the first-stage grinding process is controlled at 30%-65%.

3. The method for beneficiating high matte grade copper smelting slag according to claim 1, characterized in that: The fineness requirement of the second-stage grinding is: -200 mesh 60-80%, and the pulp concentration during the second-stage grinding process is controlled at 15%-45%.

4. The method for beneficiating high matte grade copper smelting slag according to claim 1, characterized in that: The pH value in the first stage of flotation is 7-8, the dosage is controlled as follows: 100-180 g / t of butyl sodium xanthate and 100 g / t of pine oil, and the temperature in the first stage of flotation is 40-60°C.

5. The method for beneficiating high matte grade copper smelting slag according to claim 1, characterized in that: The fineness requirement of the three-stage grinding is: -325 mesh 80%-90%, and the pulp concentration during the three-stage grinding process is 60%-80%.

6. The method for beneficiating high matte grade copper smelting slag according to claim 1, characterized in that: The pH value during the second stage flotation process is 7-8, the dosage is controlled as follows: 100-180 g / t of butyl sodium xanthate, 100 g / t of pine oil, and the temperature during the second stage flotation process is 40-60°C.

7. The beneficiation method of high matte grade copper smelting slag according to claim 4 or 6, characterized in that: The control of the dosage is achieved by setting quantitative dosage points.

8. The method for beneficiating high matte grade copper smelting slag according to claim 7, characterized in that: The principle of controlling the amount of medicine at the quantitative dosing point is: installing a quantitative dosing device on each branch pipeline to control the amount of medicine, that is, controlling the amount of medicine by adjusting the flow rate of the quantitative dosing device.

Images