Process for beneficiation and dilution of silver furnace copper smelting slag

Abstract

The invention relates to the technical field of smelting engineering byproduct recycling, in particular to a silver furnace copper smelting slag beneficiation dilution process which comprises the following steps: step 1, slag slow cooling: high-temperature copper smelting slag discharged by a silver furnace is poured into a slag pit for natural slow cooling; 2, first-stage ore grinding: conveying the slowly cooled slag to a first-stage ball mill for ore grinding, and separating by a cyclone; according to the method, the monomer dissociation degree of useful minerals in the slag is increased, the floatability of the useful minerals is improved, meanwhile, the researched and developed novel efficient collecting foaming agent ester-22 effectively strengthens the selective collecting performance of copper minerals, the situation that grinding and flotation operations are separately carried out in the past is changed, a grinding and flotation major cycle is formed between the grinding operation and the flotation operation, and the flotation efficiency is improved. The floatability of useful minerals is improved, the adaptability is better, the device is more compact and reasonable, the copper metal recovery rate is greatly improved, the technological process is simple, all technological parameters are easy to control, and field operation is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of recycling and utilizing byproducts of smelting engineering, and in particular to a process for mineral processing and depletion of copper smelting slag from a silver furnace. Background Art

[0002] The copper smelting slag from Baiyinlu is a valuable man-made copper ore resource. With the expansion of production capacity, new slag is continuously produced, and the accumulated stockpile of slag is also increasing. The slag contains rich copper metal. If it is not recycled and utilized comprehensively, the stockpile of these slags will not only seriously damage the local ecological environment, but also affect the economic benefits of the enterprise and hinder the further development of the enterprise's circular economy. Therefore, it is imperative to carry out resource recycling and comprehensive utilization of the copper smelting slag from Baiyinlu.

[0003] Baiyinlu copper smelting slag is the slag produced by smelting copper concentrate in a silver furnace. It has a brown, dense block appearance, high specific gravity, high hardness, and high requirements for grinding fineness. The grinding fineness has a great influence on the product recovery rate. At present, the Baiyinlu copper smelter adopts electric furnace depletion and mineral processing depletion technology. The comprehensive resource utilization of copper smelting slag not only has significant economic benefits, but more importantly, it solves the problems of smelting slag discharge, storage and consumption of scarce water resources. Therefore, the optimization research on the depletion process of Baiyinlu copper smelting slag has great economic significance for the economic, rational and efficient utilization of energy and resources, turning waste into treasure and harm into benefit. Summary of the invention

[0004] The present invention provides a process for beneficiation and depletion of copper smelting slag from a silver furnace, which overcomes the deficiencies of the above-mentioned prior art and can effectively solve the problems of complex process flow of copper smelting slag from a silver furnace, being unfavorable for on-site operation, and low copper metal recovery rate.

[0005] In order to solve the above problems, the present invention provides a process for beneficiation and depletion of silver furnace copper smelting slag, comprising the following steps: The first step is to slowly cool the slag: pour the high-temperature copper smelting slag discharged from the silver furnace into the slag pit for natural slow cooling; The second step is primary grinding: the slowly cooled slag is transported to the primary ball mill for grinding. After separation in the cyclone, the overflow slurry enters the secondary grinding operation, and the settled sand returns to the primary ball mill for further grinding. The third step is the second stage grinding: after the middlings are classified, the coarse-grained lean intergrowths with poor monomer dissociation degree and even the undissociated inclusions are returned to the ball mill for further grinding. The overflow slurry from the second stage is separated by the hydrocyclone and then subjected to three concentration operations after meeting specific requirements. The sand settling is returned to the second stage ball mill for further grinding. The fourth step is roughing: the overflow pulp of the secondary grinding operation enters the stirring tank, and the collecting foaming agent ester-22 and the collector dosage are added to obtain the first pulp. The first pulp enters the flotation machine for roughing, and a section of scavenging foam and a section of roughing underflow are obtained; The fifth step is two scavenging operations: the first roughing underflow is added with the collecting foaming agent ester-22 and then enters the first scavenging operation to obtain the first scavenging foam and the first scavenging underflow. The first scavenging foam returns to the second grinding stage. The first scavenging underflow is added with the collecting foaming agent ester-22 and then enters the second scavenging operation to obtain the second scavenging foam and the second scavenging underflow. The second scavenging foam enters the first scavenging operation. The second scavenging underflow is the tailings. Step 6, three-stage concentration: the roughing foam enters the flotation column for primary concentration to obtain primary concentration foam and primary concentration underflow, and the primary concentration underflow is returned to the second-stage grinding; the primary concentration foam enters the flotation column for secondary concentration to obtain secondary concentration foam and secondary concentration underflow, and the secondary concentration underflow is returned to the primary concentration operation; the secondary concentration foam enters the flotation column for tertiary concentration, and the tertiary concentration underflow is returned to the secondary concentration operation, and the tertiary concentration foam is concentrated and filtered to obtain copper concentrate; In the seventh step, the tailings and the copper concentrate are dehydrated to obtain tailings products and copper concentrate products respectively.

[0006] The high-temperature copper smelting slag discharged from the silver furnace is poured into the slag pit for natural slow cooling, and the slow cooling time is 3-7 days.

[0007] The above-mentioned overflow fineness is -200 mesh, 80%±3%, the discharge concentration is 72-78%, and the overflow concentration is 45-52%.

[0008] The above-mentioned second-stage overflow fineness is -325 mesh, 80%±3%, the second-stage discharge concentration is 65%±3%, and the second-stage overflow concentration is 37~41%.

[0009] The above-mentioned middlings are formed by combining the bottom flow of the first concentration and the foam of the first scavenging.

[0010] In the fourth step of rough selection, the amount of the collecting foaming agent ester-22 is 140-170g / t.

[0011] In the fifth step of scanning, the amount of the capture foaming agent ester-22 is 0-30g / t.

[0012] Compared with the prior art, the present invention has the following advantages: 1. The present invention slowly cools the silver furnace copper smelting slag, grinds the cooled silver furnace slag to 80%±3%-325 mesh, adds ester-22 in the roughing operation to perform copper roughing, and the obtained rough concentrate is subjected to three times of concentrating to produce copper concentrate, and the roughing tailings are subjected to two times of scavenging to produce tailings, and the tailings of the first concentrating and the foam of the first scavenging are combined as the middling ore and are graded and then driven into the grinding system for the mineral processing process; the tailings of the first concentrating and the foam of the first scavenging are combined as the middling ore, and after classification, the coarse-grained poor intergrowths with poor monomer dissociation degree and even the undissociated inclusions are returned to the ball mill for re-grinding, thereby greatly increasing the monomer dissociation degree of useful minerals and improving the floatability of useful minerals in the grinding product; and the new high-efficiency and environmentally friendly collecting foaming agent ester-22 with good selective collecting performance for artificial secondary copper minerals is used to effectively strengthen the collecting effect of artificial secondary copper minerals and effectively improve the recovery rate of copper metal.

[0013] 2. The present invention improves the monomer dissociation degree of useful minerals in the slag and improves the floatability of useful minerals. At the same time, the new high-efficiency capture frother ester-22 developed effectively enhances the selective capture performance of copper minerals, changing the previous situation where grinding and flotation operations were carried out separately, forming a large grinding and flotation cycle between grinding and flotation operations, improving the floatability of useful minerals, having better adaptability, being more compact and reasonable, greatly improving the copper metal recovery rate, having a simple process flow, and being easy to control various process parameters, which is conducive to on-site operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0015] Figure 1 This is a process flow chart of Example 1 of the present invention. DETAILED DESCRIPTION

[0016] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0017] Example 1: Figure 1 As shown, the embodiment of the present invention discloses a process for beneficiation and depletion of silver furnace copper smelting slag, comprising the following steps: The first step is to slow cool the slag: pour the high-temperature copper smelting slag discharged from the silver furnace into the slag pit for natural slow cooling; the natural slow cooling time is 3-7 days, so that the copper minerals in the copper smelting slag can be fully crystallized and grown.

[0018] The second step is one-stage grinding: the slowly cooled slag is transported to the first-stage ball mill for grinding. After separation in the cyclone, the overflow slurry enters the second-stage grinding operation, and the sand is returned to the first-stage ball mill for further grinding. Among them, the first-stage overflow fineness is -200 mesh, 80%±3%, the first-stage discharge concentration is 72~78%, and the first-stage overflow concentration is 45~52%. After separation in the cyclone, the overflow slurry with the required particle size enters the second-stage grinding operation.

[0019] The third step is the second stage grinding: after the middling ore is classified, the coarse-grained lean intergrowths with poor monomer dissociation degree and even the undissociated inclusions are returned to the ball mill for re-grinding. The overflow slurry of the second stage is separated by the cyclone and then meets the specific requirements and then undergoes three concentration operations. The sand is returned to the second stage ball mill for further grinding. Among them, the second stage overflow fineness is -325 mesh, 80%±3%, the second stage discharge concentration is 65%±3%, and the second stage overflow concentration is 37-41%. The middling ore is formed by the merging of the bottom flow of the first concentration and the foam of the first scavenging. After the middling ore is classified, the coarse-grained lean intergrowths with poor monomer dissociation degree and even the undissociated inclusions are returned to the ball mill for re-grinding, which greatly increases the monomer dissociation degree of useful minerals and improves the floatability of useful minerals in the grinding products.

[0020] The fourth step is roughing: the overflow pulp of the secondary grinding operation enters the stirring tank, and the collector frother ester-22 and the collector dosage are added to obtain the first pulp. The first pulp enters the flotation machine for roughing to obtain a section of scavenging foam and a section of roughing underflow; wherein, the amount of collector frother ester-22 added in the roughing process is 140-170g / t.

[0021] The fifth step is two scavenging operations: the first roughing underflow is added with the collecting frother ester-22 and enters the first scavenging operation to obtain the first scavenging foam and the first scavenging underflow, the first scavenging foam returns to the second grinding, the first scavenging underflow is added with the collecting frother ester-22 and enters the second scavenging operation to obtain the second scavenging foam and the second scavenging underflow, the second scavenging foam enters the first scavenging operation, and the second scavenging underflow is the tailings; wherein, in the scavenging process, the amount of collecting frother ester-22 is 0-30g / t, and the new high-efficiency and environmentally friendly collecting frother ester-22 is selected, which effectively strengthens the collection effect of artificial secondary copper minerals and improves the recovery rate of copper metal; this process changes the previous situation where grinding and flotation operations are carried out separately, and forms a large grinding and flotation cycle between grinding and flotation operations, so that the process is more adaptable to silver slag and more compact and reasonable.

[0022] Step 6, three-stage concentration: the roughing foam enters the flotation column for primary concentration to obtain primary concentration foam and primary concentration underflow, and the primary concentration underflow is returned to the second-stage grinding; the primary concentration foam enters the flotation column for secondary concentration to obtain secondary concentration foam and secondary concentration underflow, and the secondary concentration underflow is returned to the primary concentration operation; the secondary concentration foam enters the flotation column for tertiary concentration, and the tertiary concentration underflow is returned to the secondary concentration operation, and the tertiary concentration foam is concentrated and filtered to obtain copper concentrate; Among them, the third-level selected foam is concentrated by a thickener (the solid content of overflow water is ≤0.09kg / m 3 , discharge concentration 55-65%), filtration, copper filter cake moisture 8-10%, after dehydration to obtain copper concentrate.

[0023] In the seventh step, the tailings and the copper concentrate are dehydrated to obtain tailings products and copper concentrate products respectively.

[0024] Example 2: The embodiment of the present invention discloses a process for mineral processing and depletion of Baiyin furnace copper smelting slag. The main components in the Baiyin furnace copper smelting slag are as follows by weight percentage: Cu: 0.926%.

[0025] (1) The high-temperature copper smelting slag discharged from the silver furnace is poured into the slag pit for natural slow cooling. The slow cooling time is 3 days to allow the copper minerals in the slag to fully crystallize and grow.

[0026] (2) Take 1000g of the slag in step (1) and send it to the first-stage ball mill for grinding. After separation by the cyclone, the overflow slurry with a first-stage overflow fineness (-200 mesh) of 82% enters the second-stage grinding operation, and the sand is returned to the first-stage ball mill for further grinding. The first-stage discharge concentration is 76.3%, and the first-stage overflow concentration is 48.3%.

[0027] (3) The underflow from the first concentration and the foam from the first scavenging are combined as the middlings and returned to the ball mill for the second stage grinding with the sand settling in step (2). The overflow slurry has a fineness of 81% (-325 mesh) after separation in the cyclone and enters the third concentration operation. The second stage discharge concentration is 64.8% and the second stage overflow concentration is 40.5%.

[0028] (4) The overflow slurry in step (3) is stirred and 150 mg of the collecting foaming agent ester-22 is added, and the slurry is subjected to a scavenging flotation machine for roughing to obtain a scavenging froth and a roughing underflow.

[0029] (5) After adding 15 mg of collecting frother ester-22 to the roughing underflow in step (4), the roughing underflow enters the primary scavenging operation to obtain primary scavenging foam and primary scavenging underflow. The primary scavenging foam returns to the secondary grinding. After adding 5 mg of collecting frother ester-22 to the primary scavenging underflow, the roughing underflow enters the secondary scavenging operation to obtain secondary scavenging foam and secondary scavenging underflow. The secondary scavenging foam enters the primary scavenging operation. The secondary scavenging underflow is the product tailings.

[0030] (6) The scavenged foam in step (5) is used for three-stage concentration, and the underflow of the first-stage concentration is returned to the second-stage grinding; the foam of the first-stage concentration is used for the second-stage concentration, and the underflow of the second-stage concentration is returned to the first-stage concentration operation; the foam of the second-stage concentration is used for the third-stage concentration, and the underflow of the third-stage concentration is returned to the second-stage concentration operation, and the foam of the third-stage concentration is concentrated (the solid content of the overflow water is 0.08 kg / m 3 , discharge concentration 62%), filtration, copper filter cake moisture 8.6%, after dehydration to obtain copper concentrate product.

[0031] (7) The copper concentrate product in step (6) and the tailings product in step (5) are dehydrated to obtain a copper concentrate product and a tailings product.

[0032] The main components of the product are: copper concentrate grade 23.99%, copper content in tailings 0.17%, and copper ore dressing recovery rate 82.23%.

[0033] Example 3: The embodiment of the present invention discloses a process for mineral processing and depletion of Baiyin furnace copper smelting slag, wherein the main components in the Baiyin furnace copper smelting slag are, by weight percentage, Cu: 1.12%.

[0034] (1) The high-temperature copper smelting slag discharged from the silver furnace is poured into the slag pit for natural slow cooling. The slow cooling time is 4 days to allow the copper minerals in the slag to fully crystallize and grow.

[0035] (2) Take 1500g of the slag in step (1) and send it to the first-stage ball mill for grinding. After separation by the cyclone, the overflow slurry with a first-stage overflow fineness (-200 mesh) of 80% enters the second-stage grinding operation, and the sand is returned to the first-stage ball mill for further grinding. The first-stage discharge concentration is 75%, and the first-stage overflow concentration is 50.6%.

[0036] (3) The underflow from the first concentration and the foam from the first scavenging are combined as the middlings and returned to the ball mill for the second stage grinding with the sand settling in step (2). The overflow slurry has a fineness of 83% (-325 mesh) after separation in the cyclone and enters the third concentration operation. The second stage discharge concentration is 66% and the second stage overflow concentration is 39.6%.

[0037] (4) The overflow slurry in step (3) was stirred and 225 mg of the collecting foaming agent ester-22 was added, and the slurry was subjected to a scavenging flotation machine for roughing to obtain a scavenging froth and a roughing underflow.

[0038] (5) After adding 22 mg of collecting frother ester-22 to the roughing underflow in step (4), the roughing underflow enters the primary scavenging operation to obtain primary scavenging foam and primary scavenging underflow. The primary scavenging foam returns to the secondary grinding. After adding 8 mg of collecting frother ester-22 to the primary scavenging underflow, the roughing underflow enters the secondary scavenging operation to obtain secondary scavenging foam and secondary scavenging underflow. The secondary scavenging foam enters the primary scavenging operation. The secondary scavenging underflow is the product tailings.

[0039] (6) The scavenged foam in step (5) is used for three-stage concentration, and the underflow of the first-stage concentration is returned to the second-stage grinding; the foam of the first-stage concentration is used for the second-stage concentration, and the underflow of the second-stage concentration is returned to the first-stage concentration operation; the foam of the second-stage concentration is used for the third-stage concentration, and the underflow of the third-stage concentration is returned to the second-stage concentration operation, and the foam of the third-stage concentration is concentrated (the solid content of the overflow water is 0.05kg / m 3 , discharge concentration 58%), filtration, copper filter cake moisture 9%, after dehydration to obtain copper concentrate product.

[0040] (7) The copper concentrate product in step (6) and the tailings product in step (5) are dehydrated to obtain a copper concentrate product and a tailings product.

[0041] The main components of the product are: copper concentrate grade 21.26%, copper content in tailings 0.15%, and copper ore dressing recovery rate 83.46%.

[0042] The invention provides a mineral processing process in which the silver furnace copper smelting slag is slowly cooled, the cooled silver furnace slag is ground to 80%±3%-325 mesh, ester-22 is added in the roughing operation to perform copper roughing, the obtained rough concentrate is subjected to three-times of cleaning to produce copper concentrate, the roughing tailings are subjected to two-times of scavenging to produce tailings, the tailings of the first cleaning and the foam of the first scavenging are combined as the middlings and are graded and then driven into the grinding system; the tailings of the first cleaning and the foam of the first scavenging are combined as the middlings, and after classification, the coarse-grained poor intergrowths with poor monomer dissociation degree and even the undissociated inclusions are returned to the ball mill for re-grinding, thereby greatly increasing the monomer dissociation degree of useful minerals and improving the floatability of useful minerals in the grinding products; and the new high-efficiency and environmentally friendly collecting foaming agent ester-22 with good selective collecting performance for artificial secondary copper minerals is used to effectively strengthen the collecting effect of artificial secondary copper minerals and effectively improve the recovery rate of copper metal.

[0043] Therefore, the present invention improves the monomer dissociation degree of useful minerals in the slag and improves the floatability of useful minerals. At the same time, the new high-efficiency capture frother ester-22 developed effectively enhances the selective capture performance of copper minerals, changes the previous situation in which grinding and flotation operations are carried out separately, forms a large grinding and flotation cycle between grinding and flotation operations, improves the floatability of useful minerals, has better adaptability, is more compact and reasonable, greatly improves the copper metal recovery rate, has a simple process flow, and is easy to control various process parameters, which is conducive to on-site operation.

Claims

1. A process for beneficiation and depletion of copper smelting slag from a silver furnace, characterized in that: The following steps are involved: The first step is to slowly cool the slag: pour the high-temperature copper smelting slag discharged from the silver furnace into the slag pit for natural slow cooling; The second step is primary grinding: the slowly cooled slag is transported to the primary ball mill for grinding. After separation in the cyclone, the overflow slurry enters the secondary grinding operation, and the settled sand returns to the primary ball mill for further grinding. The third step is the second stage grinding: after the middlings are classified, the coarse-grained lean intergrowths with poor monomer dissociation degree and even the undissociated inclusions are returned to the ball mill for further grinding. The overflow slurry from the second stage is separated by the hydrocyclone and then subjected to three concentration operations after meeting specific requirements. The sand settling is returned to the second stage ball mill for further grinding. The fourth step is roughing: the overflow pulp of the secondary grinding operation enters the stirring tank, and the collecting foaming agent ester-22 and the collector dosage are added to obtain the first pulp. The first pulp enters the flotation machine for roughing, and a section of scavenging foam and a section of roughing underflow are obtained; The fifth step is two scavenging operations: the first roughing underflow is added with the collecting foaming agent ester-22 and then enters the first scavenging operation to obtain the first scavenging foam and the first scavenging underflow. The first scavenging foam returns to the second grinding stage. The first scavenging underflow is added with the collecting foaming agent ester-22 and then enters the second scavenging operation to obtain the second scavenging foam and the second scavenging underflow. The second scavenging foam enters the first scavenging operation. The second scavenging underflow is the tailings. Step 6, three-stage concentration: the roughing foam enters the flotation column for primary concentration to obtain primary concentration foam and primary concentration underflow, and the primary concentration underflow is returned to the second-stage grinding; the primary concentration foam enters the flotation column for secondary concentration to obtain secondary concentration foam and secondary concentration underflow, and the secondary concentration underflow is returned to the primary concentration operation; the secondary concentration foam enters the flotation column for tertiary concentration, and the tertiary concentration underflow is returned to the secondary concentration operation, and the tertiary concentration foam is concentrated and filtered to obtain copper concentrate; In the seventh step, the tailings and the copper concentrate are dehydrated to obtain tailings products and copper concentrate products respectively.

2. The process for beneficiation and depletion of silver furnace copper smelting slag according to claim 1, characterized in that: The high-temperature copper smelting slag discharged from the silver furnace is poured into a slag pit for natural slow cooling, and the slow cooling time is 3-7 days.

3. The process for beneficiation and depletion of silver furnace copper smelting slag according to claim 1, characterized in that: The first-stage overflow fineness is -200 mesh, 80%±3%, the first-stage discharge concentration is 72-78%, and the first-stage overflow concentration is 45-52%.

4. The process for beneficiation and depletion of silver furnace copper smelting slag according to claim 1, characterized in that: The second-stage overflow fineness is -325 mesh, 80%±3%, the second-stage discharge concentration is 65%±3%, and the second-stage overflow concentration is 37-41%.

5. The process for beneficiation and depletion of silver furnace copper smelting slag according to claim 1, characterized in that: The middlings are formed by combining the underflow from the first concentration and the froth from the first scavenging.

6. The process for beneficiation and depletion of silver furnace copper smelting slag according to claim 1, characterized in that: In the fourth step of rough selection, the amount of the collecting foaming agent ester-22 is 140-170 g / t.

7. The process for beneficiation and depletion of silver furnace copper smelting slag according to claim 1, characterized in that: In the fifth step of scanning, the amount of the collecting foaming agent ester-22 is 0-30g / t.

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