Continuous dechlorination system and method for zinc hydrometallurgy replacement copper deposition

Abstract

The invention discloses a zinc hydrometallurgy replacement copper deposition continuous dechlorination system and method. The system comprises a dechlorination operation tank, a plate-and-frame filter press, a copper deposition operation tank and a thickener. The dechlorination operation tank, the plate-and-frame filter press, the copper deposition operation tank and the thickener are connected in sequence; and the thickener is also connected with the dechlorination operation tank. According to the method, the problems that Cl <-> in zinc hydrometallurgy is enriched for a long time and cannot be removed, and the corrosion of the Cl <-> to a zinc electrolysis anode plate and process equipment is aggravated can be solved, meanwhile, continuous dechlorination operation can be achieved, the self-produced copper slag is used as a dechlorination raw material, no new material is added, and new impurity elements are prevented from being brought into a system.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgy, and more particularly to a continuous dechlorination system and method for hydrometallurgical zinc smelting replacement copper precipitation. Background Art

[0002] In recent years, with the rapid development of my country's economy, the metal smelting industry has become increasingly competitive. The utilization of metal ore resources has increased year by year, the cost of raw materials has risen year by year, and the processing cost space has been further compressed. In order to survive, enterprises have adjusted the adaptability of production processes, processed high-rich raw ores, slag materials, etc., and diversified their products. High-rich raw materials are often accompanied by high impurities. Among them, Cl - The large amount of Cl- will aggravate the corrosion of pipelines, pumps and lead anode plates, shorten their service life and increase economic costs. Therefore, the removal of Cl- in the hydrometallurgical zinc smelting process is very important; especially in the fully hydrometallurgical zinc smelting process, chlorine mainly comes from the raw material zinc sulfide concentrate, and the most commonly used wet dechlorination methods are copper slag dechlorination, silver chloride dechlorination, ion exchange method, extraction method, etc.; and copper slag dechlorination is a commonly used process in the current zinc hydrometallurgical smelting process. Summary of the invention

[0003] In view of this, the present invention provides a continuous dechlorination system and method for hydrometallurgical zinc replacement copper precipitation. - , reduce Cl - It can reduce the corrosion of zinc electrolysis anode plates and process equipment, thereby reducing production costs.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] A continuous dechlorination system for hydrometallurgical zinc replacement copper precipitation, comprising: a dechlorination operation tank, a plate-frame filter press, a copper precipitation operation tank, and a thickener;

[0006] The dechlorination operation tank, the plate and frame filter press, the copper precipitation operation tank and the thickener are connected in sequence;

[0007] The thickener is also connected to the dechlorination operation tank.

[0008] Another object of the present invention is to provide a method for continuous dechlorination of copper precipitation by substitution during zinc hydrometallurgy, which adopts the above system and comprises the following steps:

[0009] 1) Add a section of supernatant to the dechlorination operation tank, and control the operation time to 30 to 60 minutes;

[0010] 2) The slurry produced in the dechlorination operation tank is transported to a plate and frame filter press for liquid-solid separation to obtain dechlorinated copper slag and dechlorinated liquid;

[0011] 3) The dechlorinated copper slag after liquid-solid separation is exported, and the dechlorinated liquid is transported to the copper precipitation operation tank for replacement copper precipitation operation;

[0012] 4) adding the dechlorinated liquid and reduced iron powder into the copper precipitation operation tank to replace the copper precipitation and produce the replacement copper precipitation slurry;

[0013] 5) The replaced copper precipitate slurry is sent to a thickener for thickening liquid-solid separation, the supernatant is sent to the outside for iron removal, and the thickener bottom liquid is sent to the dechlorination operation tank, and steps 1)-5) are repeated.

[0014] The copper slag + one-stage supernatant dechlorination process of the present invention utilizes the Cl-containing - and Cu 2+ The weak acid leaching solution of ions is added with copper slag containing elemental copper to make it Cu 2+ +Cu + 2Cl - =2CuCl reaction, forming CuCl precipitate, removing Cl- from the solution

[0015] Preferably, in step 1), the amount of reduced iron powder added to the dechlorinated liquid is 1.5 to 1.8 times the theoretical amount of copper in the dechlorinated liquid.

[0016] Preferably, the copper slag in the replacement copper precipitation slurry in step 1) contains ≥50% copper.

[0017] Preferably, the temperature of the supernatant in step 3) is ≥85°C, the acid content is ≥3g / L, the copper content is ≥900mg / L, and the chlorine content is ≥900mg / L.

[0018] In the present invention, the first supernatant is a leaching slurry produced by pressurized leaching of zinc sulfide concentrate using acid solution and oxygen, and then a leaching liquid is obtained by liquid-solid separation.

[0019] It can be seen from the above technical solution that compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention can solve the problem of Cl - Long-term enrichment cannot be removed, Cl - It aggravates the corrosion problem of zinc electrolysis anode plates and process equipment. At the same time, it can realize continuous dechlorination operation and use self-produced copper slag as dechlorination raw material. No new materials are added, which avoids introducing new impurity elements into the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0022] Figure 1 This is a connection diagram of the dechlorination process system of the present invention;

[0023] Figure 2 This is a process flow chart of dechlorination of the present invention;

[0024] Among them, in the figure:

[0025] 1- dechlorination operation tank; 2- plate and frame filter press; 3- copper precipitation operation tank; 4- thickener. DETAILED DESCRIPTION

[0026] 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.

[0027] Example 1

[0028] This embodiment provides a continuous dechlorination system for zinc hydrometallurgy replacement copper precipitation, comprising: a dechlorination operation tank 1, a plate-frame filter press 2, a copper precipitation operation tank 3, and a thickener 4;

[0029] The dechlorination operation tank 1, the plate and frame filter press 2, the copper precipitation operation tank 3 and the thickener 4 are connected in sequence;

[0030] The thickener 4 is also connected to the dechlorination operation tank 1 .

[0031] Example 2

[0032] This embodiment provides a method for continuous dechlorination of copper precipitation by substitution of zinc hydrometallurgy, comprising the following steps:

[0033] 1) Add a section of supernatant to the dechlorination operation tank (temperature 86°C, acid content 5.01g / L, copper content 965.4mg / L, chlorine content 999.69mg / L), and the operation time is controlled within 40min;

[0034] 2) The slurry produced in the dechlorination operation tank is transported to a plate-frame filter press for liquid-solid separation to obtain dechlorinated copper slag and dechlorinated liquid, containing 349.89 mg / L of chlorine and a chlorine removal rate of 65.00%;

[0035] 3) The dechlorinated copper slag after liquid-solid separation is exported, and the dechlorinated liquid is transported to the copper precipitation operation tank for replacement copper precipitation operation;

[0036] 4) adding the dechlorinated liquid and reduced iron powder into the copper precipitation operation tank to replace the copper precipitation and produce the replacement copper precipitation slurry;

[0037] 5) The replaced copper precipitate slurry is sent to a thickener for thickening liquid-solid separation, the supernatant is sent to the outside for iron removal, and the thickener bottom liquid (copper slag in the slurry contains 50% copper) is sent to the dechlorination operation tank, and steps 1)-5) are repeated.

[0038] Example 3

[0039] This embodiment provides a method for continuous dechlorination of copper precipitation by substitution of zinc hydrometallurgy, comprising the following steps:

[0040] 1) Add a section of supernatant to the dechlorination operation tank (temperature 85.5°C, acid content 4.21g / L, copper content 1396.7mg / L, chlorine content 1349.58mg / L), and the operation time is controlled within 35min;

[0041] 2) The slurry produced in the dechlorination operation tank is transported to a plate-and-frame filter press for liquid-solid separation to obtain dechlorinated copper slag and dechlorinated liquid, containing 799.75 mg / L chlorine and a chlorine removal rate of 40.74%;

[0042] 3) The dechlorinated copper slag after liquid-solid separation is exported, and the dechlorinated liquid is transported to the copper precipitation operation tank for replacement copper precipitation operation;

[0043] 4) adding the dechlorinated liquid and reduced iron powder into the copper precipitation operation tank to replace the copper precipitation and produce the replacement copper precipitation slurry;

[0044] 5) The replaced copper precipitate slurry is sent to a thickener for thickening liquid-solid separation, the supernatant is sent to the outside for iron removal, and the thickener bottom liquid (copper slag in the slurry contains 53% copper) is sent to the dechlorination operation tank, and steps 1)-5) are repeated.

[0045] Example 4

[0046] This embodiment provides a method for continuous dechlorination of copper precipitation by substitution of zinc hydrometallurgy, comprising the following steps:

[0047] 1) Add a section of supernatant to the dechlorination operation tank (temperature 87°C, acid content 3.81g / L, copper content 262mg / L, chlorine content 999.69mg / L), and the operation time is controlled within 50min;

[0048] 2) The slurry produced in the dechlorination operation tank is transported to a plate-frame filter press for liquid-solid separation to obtain dechlorinated copper slag and dechlorinated liquid, containing 549.83 mg / L of chlorine and a chlorine removal rate of 45.00%;

[0049] 3) The dechlorinated copper slag after liquid-solid separation is exported, and the dechlorinated liquid is transported to the copper precipitation operation tank for replacement copper precipitation operation;

[0050] 4) adding the dechlorinated liquid and reduced iron powder into the copper precipitation operation tank to replace the copper precipitation and produce the replacement copper precipitation slurry;

[0051] 5) The replaced copper precipitate slurry is sent to a thickener for thickening liquid-solid separation, the supernatant is sent to the outside for iron removal, and the thickener bottom liquid (copper slag in the slurry contains 52% copper) is sent to the dechlorination operation tank, and steps 1)-5) are repeated.

[0052] Example 5

[0053] This embodiment provides a method for continuous dechlorination of copper precipitation by substitution of zinc hydrometallurgy, comprising the following steps:

[0054] 1) Add a section of supernatant to the dechlorination operation tank (temperature 86.5°C, acid content 4.41g / L, copper content 1378.9mg / L, chlorine content 1049.67mg / L), and the operation time is controlled within 55min;

[0055] 2) The slurry produced in the dechlorination operation tank is transported to a plate-frame filter press for liquid-solid separation to obtain dechlorinated copper slag and dechlorinated liquid, containing 649.79 mg / L of chlorine and a chlorine removal rate of 38.10%;

[0056] 3) The dechlorinated copper slag after liquid-solid separation is exported, and the dechlorinated liquid is transported to the copper precipitation operation tank for replacement copper precipitation operation;

[0057] 4) adding the dechlorinated liquid and reduced iron powder into the copper precipitation operation tank to replace the copper precipitation and produce the replacement copper precipitation slurry;

[0058] 5) The replaced copper precipitate slurry is sent to a thickener for thickening liquid-solid separation, the supernatant is sent to the outside for iron removal, and the thickener bottom liquid (copper slag in the slurry contains 55% copper) is sent to the dechlorination operation tank, and steps 1)-5) are repeated.

[0059] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0060] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one 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 present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A continuous dechlorination system for hydrometallurgical zinc replacement copper precipitation, characterized in that: include: Dechlorination operation tank, plate and frame filter press, copper precipitation operation tank, thickener; The dechlorination operation tank, the plate and frame filter press, the copper precipitation operation tank and the thickener are connected in sequence; The thickener is also connected to the dechlorination operation tank.

2. A method for continuous dechlorination of hydrometallurgical zinc replacement copper precipitation, characterized in that: The system of claim 1 comprises the following steps: 1) Add a section of supernatant to the dechlorination operation tank, and control the operation time to 30 to 60 minutes; 2) The slurry produced in the dechlorination operation tank is transported to a plate and frame filter press for liquid-solid separation to obtain dechlorinated copper slag and dechlorinated liquid; 3) The dechlorinated copper slag after liquid-solid separation is exported, and the dechlorinated liquid is transported to the copper precipitation operation tank for replacement copper precipitation operation; 4) adding the dechlorinated liquid and reduced iron powder into the copper precipitation operation tank to replace the copper precipitation and produce the replacement copper precipitation slurry; 5) The replaced copper precipitate slurry is sent to a thickener for thickening liquid-solid separation, the supernatant is sent to the outside for iron removal, and the thickener bottom liquid is sent to the dechlorination operation tank, and steps 1)-5) are repeated.

3. The method for continuous dechlorination of zinc hydrometallurgy replacement copper precipitation according to claim 2, characterized in that: The supernatant liquid in step 1) is the supernatant liquid obtained by subjecting the zinc sulfide concentrate to a period of oxygen pressure leaching.

4. The method for continuous dechlorination of copper precipitation by substitution during zinc hydrometallurgy according to claim 3, characterized in that: In step 4), the amount of reduced iron powder added is 1.5 to 1.8 times the theoretical amount of copper in the dechlorinated liquid.

5. The method for continuous dechlorination of copper precipitation by substitution during zinc hydrometallurgy according to claim 2, characterized in that: The copper slag in the replacement copper precipitation slurry in step 4) contains ≥50% copper.

6. The method for continuous dechlorination of copper precipitation by substitution during zinc hydrometallurgy according to claim 3, characterized in that: The temperature of the supernatant in step 1) is ≥85°C, the acid content is ≥3g / L, the copper content is ≥900mg / L, and the chlorine content is ≥900mg / L.

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