Method for producing high-zinc high-iron acid solution through zinc hydrometallurgy and removing iron in oxygen pressure kettle at medium temperature

Abstract

The invention belongs to the technical field of zinc smelting, and discloses a method for producing a high-zinc high-iron acid solution through zinc hydrometallurgy and removing iron in an oxygen pressure kettle at medium temperature. According to the oxygen-enriched pressurized direct leaching process based on zinc hydrometallurgy, in order to improve various economic and technical indexes, a high-zinc and high-iron acid solution is produced after process technology optimization is carried out. Then, the first-stage high-zinc high-iron acid solution is treated, an oxygen pressure kettle medium-temperature iron removal method is adopted, the iron content of the obtained iron-removed solution is 0.5-1.5 g / L, the iron-removed solution is fed to neutralization iron removal operation, the dosage of a neutralizer and the dosage of an oxidizing agent are reduced, and a qualified iron-removed supernatant solution is obtained; and hematite with iron content of more than or equal to 55% in the slag sample is obtained, and byproducts have value of sale. According to the method, efficient separation of zinc and iron is achieved, the slag rate of the system is reduced, and safe, continuous and stable operation of the full-wet-process pressure leaching zinc smelting system is guaranteed.

Description

Technical Field

[0001] This invention belongs to the field of zinc smelting technology, and more specifically relates to a method for producing a high-zinc, high-iron acidic solution and a medium-temperature iron removal method in an oxygen pressure vessel during zinc hydrometallurgy. Background Technology

[0002] Currently, the two-stage oxygen-enriched pressure direct leaching process in zinc hydrometallurgy involves leaching valuable metals such as zinc and copper from zinc sulfide concentrate and low-zinc materials to a first-stage supernatant. Under typical production conditions, the first-stage supernatant contains ≤3g / L of iron, which affects the leaching of some valuable metals such as zinc and copper; the first-stage supernatant contains ≤5g / L of acid, which affects the copper displacement precipitation operation and the recovery of copper metal.

[0003] For cases where the supernatant of the first stage is a high-zinc and high-iron acidic solution, a large amount of zinc oxide material needs to be added as a neutralizing agent for the neutralization and iron removal operation. The main impacts are as follows: (1) Production capacity: The low-zinc oxide material produced increases the load on the second-stage pressure leaching kettle, resulting in an imbalance between the leaching residue and liquid in the two stages, which is not conducive to the safe, continuous and stable operation of the all-wet zinc system. (2) Indicators: The low-zinc oxide material produced affects the leaching of the second-stage pressure leaching kettle, resulting in a high zinc content in the second-stage leaching residue, causing zinc metal loss. (3) Cost: The increased cost of oxidant procurement and steam consumption in the second-stage pressure leaching kettle leads to energy waste.

[0004] Therefore, how to provide a method for producing a high-zinc, high-iron acidic solution through zinc hydrometallurgy and a medium-temperature iron removal method using an oxygen pressure vessel is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In order to overcome the shortcomings and deficiencies of the prior art, the present invention provides a method for producing a high-zinc and high-iron acidic solution by zinc hydrometallurgy and a medium-temperature iron removal method in an oxygen pressure vessel.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A zinc hydrometallurgical process for producing a high-zinc, high-iron acidic solution and a medium-temperature iron removal method in an oxygen autoclave includes the following steps: (1) After grinding the zinc sulfide concentrate, it is added together with the low zinc material into a first-stage pressure leaching kettle. At the same time, oxygen, steam, lignin and pre-leaching liquid are added for first-stage pressure leaching. After leaching, it is sent to a thickener and flocculant is added to obtain a first-stage supernatant and a first-stage leaching underflow. (2) Add iron powder to the supernatant of a section to displace copper precipitation, filter under pressure to obtain copper slag and solution; send the solution into an oxygen pressure vessel for medium-temperature iron removal to obtain iron removal solution and hematite; (3) Add neutralizing agent and oxidizing agent to the iron removal solution to neutralize and remove iron, and obtain iron removal supernatant and neutralized iron removal oxidized low zinc material; send the iron removal supernatant to the zinc system purification electrolysis section to obtain zinc metal products.

[0007] Preferably, the process parameters for the pressure leaching in step (1) are: pressure 0.5~1.0 MPa, temperature 100~150℃, liquid-to-solid ratio 6.0~8.5:1, and oxygen consumption 45~60 Nm³. 3 / t·ore, oxygen is stopped being added to the seventh and eighth chambers of the oxygen autoclave.

[0008] Preferably, the supernatant in step (1) contains 130~160g / L of zinc, 8~15g / L of acid, and 4~12g / L of iron.

[0009] Preferably, the process parameters of the oxygen pressure vessel in step (2) are: vessel pressure 0.6~0.9MPa, temperature 135~155℃, and oxygen quantity 500~700Nm³. 3 / h.

[0010] Preferably, the oxygen content in each chamber of the oxygen autoclave in step (2) is: 300~350 Nm³ in the first chamber. 3 / h, third chamber 150~175Nm 3 / h, Fifth Chamber 150~175Nm 3 / h.

[0011] Preferably, the iron removal solution in step (2) contains 130~150 g / L of zinc, 10~20 g / L of acid, and 0.5~1.5 g / L of iron.

[0012] Preferably, the neutralizing agent in step (3) is zinc oxide.

[0013] As can be seen from the above technical solution, compared with the prior art, the present invention provides a method for producing a high-zinc, high-iron acidic solution through zinc hydrometallurgy and a medium-temperature iron removal method using an oxygen pressure vessel, which has the following beneficial effects: The beneficial effects of the above technical solution are as follows: the first-stage supernatant is a high-zinc, high-iron acidic solution. After copper precipitation, the first-stage supernatant is sent to an oxygen pressure vessel for medium-temperature iron removal, resulting in an iron removal solution with an iron content of 0.5–1.5 g / L. This solution is then sent to a neutralization iron removal process, reducing the amount of zinc oxide used as a neutralizing agent and yielding a qualified iron removal supernatant. The resulting slag sample contains hematite with an iron content of ≥55%, providing a valuable byproduct for sale. This achieves efficient zinc-iron separation, reduces the system slag rate, and ensures the safe, continuous, and stable operation of the all-wet pressure leaching zinc smelting system. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0015] Figure 1 This is a process flow diagram of the present invention. Detailed Implementation

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0018] A zinc hydrometallurgical process for producing a high-zinc, high-iron acidic solution and a medium-temperature iron removal method in an oxygen autoclave includes the following steps: (1) After grinding the zinc sulfide concentrate, it is added together with the low zinc material into a first-stage pressure leaching kettle. At the same time, oxygen, steam, lignin and pre-leaching liquid are added for first-stage pressure leaching. After leaching, it is sent to a thickener and flocculant is added to obtain a first-stage supernatant and a first-stage leaching underflow. (2) Add iron powder to the supernatant of a section to displace copper precipitation, filter under pressure to obtain copper slag and solution; send the solution into an oxygen pressure vessel for medium-temperature iron removal to obtain iron removal solution and hematite, the iron content of which is 55.3%; (3) Add neutralizing agent and oxidizing agent to the iron removal solution to neutralize and remove iron, and obtain iron removal supernatant and neutralized iron removal oxidized low zinc material; send the iron removal supernatant to the zinc system purification electrolysis section to obtain zinc metal product, which is 0# zinc ingot; send the neutralized iron removal oxidized low zinc material to the oxygen pressure leaching stage.

[0019] The process parameters for the pressure leaching step (1) are: pressure 0.8 MPa, temperature 145℃, liquid-to-solid ratio 7.0:1, and oxygen consumption 60 Nm³. 3 / t·ore, oxygen is stopped being added to the seventh and eighth chambers of the oxygen autoclave; The supernatant in step (1) contains 144 g / L of zinc, 14 g / L of acid, and 6.4 g / L of iron. The process parameters of the oxygen pressure vessel mentioned in step (2) are as follows: vessel pressure 0.8 MPa, temperature 150℃, oxygen quantity 600 Nm³. 3 / h (including the first chamber 300Nm) 3 / h, Third Chamber 150Nm 3 / h, Fifth Chamber 150Nm 3 / h); The iron removal solution in step (2) contains 142 g / L of zinc, 18 g / L of acid, and 1.5 g / L of iron. The neutralizing agent mentioned in step (3) is zinc oxide material, with a monthly dosage of 4,000 tons of dry weight. Example

[0020] A zinc hydrometallurgical process for producing a high-zinc, high-iron acidic solution and a medium-temperature iron removal method in an oxygen autoclave includes the following steps: (1) After grinding the zinc sulfide concentrate, it is added together with the low zinc material into a first-stage pressure leaching kettle. At the same time, oxygen, steam, lignin and pre-leaching liquid are added for first-stage pressure leaching. After leaching, it is sent to a thickener and flocculant is added to obtain a first-stage supernatant and a first-stage leaching underflow. (2) Add iron powder to the supernatant of a section to displace copper precipitation, filter under pressure to obtain copper slag and solution; send the solution into an oxygen autoclave for medium-temperature iron removal to obtain iron removal solution and hematite, the iron content of which is 53.2%; (3) Add neutralizing agent and oxidizing agent to the iron removal solution to neutralize and remove iron, and obtain iron removal supernatant and neutralized iron removal oxidized low zinc material; send the iron removal supernatant to the zinc system purification electrolysis section to obtain zinc metal product, which is 0# zinc ingot; send the neutralized iron removal oxidized low zinc material to the oxygen pressure leaching stage.

[0021] The process parameters for the pressure leaching step (1) are: pressure 0.6 MPa, temperature 110℃, liquid-to-solid ratio 7.0:1, and oxygen consumption 50 Nm³. 3 / t·ore, oxygen is stopped being added to the seventh and eighth chambers of the oxygen autoclave; The supernatant in step (1) contains 133 g / L of zinc, 12 g / L of acid, and 9.2 g / L of iron. The process parameters of the oxygen pressure vessel in step (2) are: vessel pressure 0.8 MPa, temperature 140℃, and oxygen quantity 600 Nm³. 3 / h (including the first chamber 300Nm) 3 / h, Third Chamber 150Nm 3 / h, Fifth Chamber 150Nm 3 / h); The iron removal solution in step (2) contains 132 g / L of zinc, 13 g / L of acid, and 1.0 g / L of iron. The neutralizing agent mentioned in step (3) is zinc oxide material, with a monthly dosage of 4,000 tons of dry weight.

[0022] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The solutions disclosed in the embodiments are described simply because they correspond to the methods disclosed in the embodiments; relevant parts can be found in the method section.

[0023] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for producing a high-zinc, high-iron acidic solution and removing iron in an oxygen autoclave during zinc hydrometallurgy, characterized in that, Includes the following steps: (1) After grinding the zinc sulfide concentrate, it is added together with the low zinc material into a first-stage pressure leaching kettle, and oxygen, steam, lignin and pre-leaching liquid are added at the same time to carry out first-stage pressure leaching; After leaching, the solution is sent to a thickener and flocculant is added to obtain a supernatant and a leaching underflow. (2) Add iron powder to the supernatant of a section to displace copper precipitation, filter under pressure to obtain copper slag and solution; send the solution into an oxygen pressure vessel for medium-temperature iron removal to obtain iron removal solution and hematite; (3) Add neutralizing agent and oxidizing agent to the iron removal solution to neutralize and remove iron, and obtain iron removal supernatant and neutralized iron removal oxidized low zinc material; send the iron removal supernatant to the zinc system purification electrolysis section to obtain zinc metal products.

2. The method for producing a high-zinc, high-iron acidic solution and removing iron in an oxygen pressure vessel using a zinc hydrometallurgical process according to claim 1, characterized in that, The process parameters for the pressure leaching step (1) are: pressure 0.5~1.0 MPa, temperature 100~150℃, liquid-to-solid ratio 6.0~8.5:1, and oxygen consumption 45~60 Nm³. 3 / t·ore, oxygen is stopped being added to the seventh and eighth chambers of the oxygen autoclave.

3. The zinc hydrometallurgical process for producing a high-zinc, high-iron acidic solution and an oxygen pressure vessel for medium-temperature iron removal, as described in claim 1, is characterized in that... The supernatant in step (1) contains 130-160 g / L of zinc, 8-15 g / L of acid, and 4-12 g / L of iron.

4. The method for producing a high-zinc, high-iron acidic solution and removing iron in an oxygen pressure vessel using a zinc hydrometallurgical process according to claim 1, characterized in that... The process parameters of the oxygen pressure vessel in step (2) are: pressure 0.6~0.9MPa, temperature 135~155℃, and oxygen quantity 500~700Nm³. 3 / h.

5. The method for producing a high-zinc, high-iron acidic solution and removing iron in an oxygen pressure vessel using a zinc hydrometallurgical process according to claim 4, characterized in that... The oxygen quantity in each chamber of the oxygen autoclave mentioned in step (2) is: 300~350 Nm³ in the first chamber. 3 / h, third chamber 150~175Nm 3 / h, Fifth Chamber 150~175Nm 3 / h.

6. The method for producing a high-zinc, high-iron acidic solution and removing iron in an oxygen pressure vessel using a zinc hydrometallurgical process according to claim 1, characterized in that, The iron removal solution in step (2) contains 130~150 g / L of zinc, 10~20 g / L of acid, and 0.5~1.5 g / L of iron.

7. The method for producing a high-zinc, high-iron acidic solution and removing iron in an oxygen pressure vessel using a zinc hydrometallurgical process according to claim 1, characterized in that, The neutralizing agent mentioned in step (3) is zinc oxide.

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