Method for strengthening zinc electrolyte purification reaction process based on impinging stream

Abstract

The invention discloses a method for strengthening a zinc electrolyte purification reaction process based on impinging stream, and belongs to the field of metallurgical engineering. Aiming at the problems of low reaction efficiency, high zinc powder consumption, high zinc content in slag and the like in the existing industrial zinc electrolysis purification process, the invention provides a method for circularly impacting a zinc powder-containing electrolyte to be purified by adopting an immersed coaxial impinging stream reaction mode, and a solution purification process can be carried out by adopting a coaxial double-nozzle distance of 4-8mm and an impacting speed of 10-70m / s; and the cyclic impact time is determined according to the impurity removal effect of the electrolyte. By adopting the method provided by the invention, the purification reaction time can be shortened, the dosage of zinc powder and the zinc content in slag are reduced, the production efficiency is improved, and the production cost is reduced; the provided process modularization is convenient for industrial amplification.

Description

Technical Field

[0001] The invention provides a novel and efficient impinging flow enhanced impurity removal method, belonging to the fields of hydrometallurgy and sewage purification. Background Art

[0002] The present invention provides a novel, highly efficient method for enhanced impurity removal from zinc sulfate solutions, specifically a method for enhancing the purification of zinc sulfate electrolyte solutions using a solid purifier, zinc powder. Approximately 90% of the world's raw zinc is produced through hydrometallurgical processes, which include roasting zinc sulfide concentrate, leaching zinc roasting sand, impurity removal and purification of the leachate, and finally zinc electrodeposition. Purifying the zinc sulfate leachate is crucial for ensuring high-quality zinc production. Traditional hydrometallurgical zinc smelting involves introducing zinc powder into the solution to be purified via waste zinc sulfate electrolyte, where propeller agitation is used to enhance mixing and the zinc powder displacement and impurity removal reaction. Propeller agitation has a limited effect on the reaction process, resulting in numerous "dead zones" within the reactor, which can easily lead to agglomeration of zinc powder particles. Furthermore, the displacement products and intermediate products of the zinc powder removal process tend to coat the surface of the zinc particles, causing passivation of the zinc powder. These factors not only result in low zinc powder impurity removal efficiency but also lead to higher zinc powder usage (compared to the theoretical amount) and higher zinc content in the slag, increasing zinc production costs. High slag volumes also increase the environmental burden. Introducing an ultrasonic field into a zinc sulfate solution to remove impurities from zinc powder is also a method to enhance the reaction process. However, due to the limited area of action of the ultrasonic field, it is difficult to act on the entire solution to be purified. Currently, only small-scale industrial trials have been conducted. Summary of the Invention

[0003] The purpose of the present invention is to provide a method for enhancing the zinc electrolyte purification reaction process based on impinging streams. The method is a more efficient zinc electrolyte impurity removal method that enhances solid / liquid reaction, and solves the problems of low zinc sulfate electrolyte purification reaction efficiency, zinc powder coating during the impurity removal process, zinc powder agglomeration, and excessive zinc powder consumption.

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

[0005] A method for enhancing the zinc electrolyte purification reaction process based on impinging streams, specifically comprising the following steps:

[0006] (1) First, the zinc sulfate solution to be purified is placed in a mixing tank, and the solution is heated to a set temperature value by a heating system; the solid purifier and the zinc sulfate solution to be purified are mixed, and then the mixed solution is accelerated and collides with each other by an impinging stream method;

[0007] (2) After the solid purifier and the zinc sulfate solution to be purified are pressurized by a pressure water pump, they are immersed in the solution to achieve collision;

[0008] (3) Adopt mixed solution circulation and multiple collision methods.

[0009] As a preferred embodiment, in step (1), the solid purifier is zinc powder, and the particle size of the zinc powder is ≤300 mesh.

[0010] As a preferred embodiment, in step (1), the zinc powder is quickly added to the solution to be purified and stirred to make it uniformly mixed.

[0011] As a preferred embodiment, in step (1), the zinc sulfate solution to be purified is placed in a mixing tank, and the solution is heated to a set temperature value (20° C. to 80° C.) by a heating system; zinc powder is quickly added to the solution and stirred to ensure uniform mixing.

[0012] As a preferred embodiment, in step (2), the uniformly mixed solution is diverted and accelerated by a dual-channel metering pump system, and the accelerated solution enters the dual inlet channels of the impinging stream reactor and undergoes relative coaxial collision after passing through the nozzle.

[0013] As a preferred embodiment, the nozzle spacing in step (2) is 4 mm to 8 mm, and the impact velocity range is 10 m / s to 70 m / s.

[0014] As a preferred embodiment, the solution after the collision in step (3) will be collected at the bottom of the impinging flow reactor and enter the collection chamber, which is provided with a sampling port. After sampling and analysis, the solution that meets the standards is released in an open circuit, and the solution that does not meet the standards is returned to the mixing tank for a new round of impact strengthening process.

[0015] The beneficial effects of this application are:

[0016] (a) Using the method of the present application, the liquid to be purified, mixed with zinc powder, undergoes relative coaxial collision. During the intense collision process, a highly turbulent region is formed between the two jets, providing excellent conditions for reaction mass transfer and heat transfer;

[0017] (b) The interaction between particles and fluid, and between particles, is enhanced, effectively removing the coating layer of solid products;

[0018] (c) The design of the circulation system of the solution to be purified can ensure that all the solution to be purified undergoes relative collision, which significantly improves the zinc powder impurity removal reaction efficiency and the utilization efficiency of the zinc powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of an impinging stream device in one embodiment of the present invention.

[0020] Figure 2 A schematic diagram of a process flow in one embodiment of the present invention.

[0021] Figure 3 A comparison of the impurity removal effects of different impurity removal processes in one embodiment of the present invention.

[0022] Figure 4 A comparison of the impurity removal effects under different zinc powder dosages in one embodiment of the present invention. DETAILED DESCRIPTION

[0023] The following is a detailed description of an embodiment of the present invention in conjunction with the accompanying drawings: This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiment.

[0024] The actual amount of zinc powder used in the examples and comparative examples is expressed as the multiple of the theoretical amount of zinc powder required to replace the impurities contained in the solution;

[0025] Theoretical zinc powder dosage: the stoichiometric zinc powder mass required to completely remove impurity ions in the solution.

[0026] Example 1:

[0027] Step 1: Prepare 1000ml of zinc sulfate solution containing copper ion impurities, with a pH of 4.2, where Zn 2+ The concentration is 150g / L, Cu 2+ The concentration is 500 mg / L;

[0028] Step 2: Place the prepared solution into the mixing tank (see attached Figure 1 ), and heating the solution to 30°C;

[0029] Step 3: After the purified solution reaches the set temperature, zinc powder (particle size distribution of zinc powder: 325-350 mesh, purity: 99.9 wt%) twice the theoretical amount of zinc powder is quickly added to the reaction system;

[0030] Step 4: The mixed solution is diverted and accelerated through a dual-channel metering pump system, and then relatively coaxially collides through a nozzle, with the impact speed controlled at 70 m / s.

[0031] Step 5: The solution after impact is collected from the bottom of the reactor, enters the collection chamber, and returns to the mixing tank to prepare for a new round of impact.

[0032] Step 6: Sample the purified solution every 2 minutes and analyze the copper ion content;

[0033] Results: After 8.5 min of impinging stream enhanced impurity removal reaction, the residual copper ion concentration in the solution was 0.05 mg / L and the copper ion removal rate was 99.99%.

[0034] Example 2:

[0035] Step 1: Prepare 1000ml of zinc sulfate solution containing copper ion impurities, with a pH of 4.2, where Zn 2+The concentration is 150g / L, Cu 2+ The concentration is 500 mg / L;

[0036] Step 2: Place the prepared solution into the impinging stream mixing tank and maintain the solution temperature at 30°C;

[0037] Step 3: After the purified solution reaches the set temperature, zinc powder (particle size distribution of zinc powder: 325-350 mesh, purity: 99.9 wt%) twice the theoretical amount of zinc powder is quickly added to the reaction system;

[0038] Step 4: The mixed solution is diverted and accelerated through a dual-channel metering pump system, and then relatively coaxially collides through a nozzle, with the impact speed controlled at 50 m / s.

[0039] Step 5: The solution after impact is collected from the bottom of the reactor, enters the collection chamber, and returns to the mixing tank to prepare for a new round of impact.

[0040] Step 6: Sample the purified solution every 2 minutes and analyze the copper ion content;

[0041] Results: After 8.5 min of impinging stream enhanced impurity removal reaction, the residual copper ion concentration in the solution was 0.4 mg / L, and the copper ion removal rate was 99.92%.

[0042] Example 3:

[0043] Step 1: Prepare 1000ml of zinc sulfate solution containing copper ion impurities, with a pH of 4.2, where Zn 2+ The concentration is 150g / L, Cu 2+ The concentration is 500 mg / L;

[0044] Step 2: Place the prepared solution into the impinging stream mixing tank and maintain the solution temperature at 30°C;

[0045] Step 3: After the purified solution reaches the set temperature, zinc powder (particle size distribution of zinc powder: 325-350 mesh, purity: 99.9 wt%) twice the theoretical amount of zinc powder is quickly added to the reaction system;

[0046] Step 4: The mixed solution is diverted and accelerated through a dual-channel metering pump system, and then relatively coaxially collides through a nozzle, with the impact speed controlled at 30 m / s.

[0047] Step 5: The solution after impact is collected from the bottom of the reactor, enters the collection chamber, and returns to the mixing tank to prepare for a new round of impact.

[0048] Step 6: Sample the purified solution every 2 minutes and analyze the copper ion content;

[0049] Results: After 8.5 min of impinging stream enhanced impurity removal reaction, the residual copper ion concentration in the solution was 13.1 mg / L and the copper ion removal rate was 93.78%.

[0050] Comparative Example 1:

[0051] Step 1: Prepare 1000ml of zinc sulfate solution containing copper ion impurities, with a pH of 4.2, where Zn 2+ The concentration is 150g / L, Cu 2+ The concentration is 500 mg / L;

[0052] Step 2: Heat the solution to 30°C, place the ultrasonic probe into the solution, and adjust the ultrasonic power to 1000W;

[0053] Step 3: After the purified solution reaches the set temperature, zinc powder (particle size distribution of zinc powder: 325-350 mesh, purity: 99.9 wt%) twice the theoretical amount of zinc powder is quickly added to the reaction system;

[0054] Step 4: Sample the purified solution every 2 minutes and analyze the copper ion content;

[0055] Results: After 8.5 min of ultrasonic enhanced impurity removal reaction, the residual copper ion concentration in the solution was 211.2 mg / L, and the copper ion removal rate was 57.76%.

[0056] Comparative Example 2:

[0057] Step 1: Prepare 1000ml of zinc sulfate solution containing copper ion impurities, with a pH of 4.2, where Zn 2+ The concentration is 150g / L, Cu 2+ The concentration is 500 mg / L;

[0058] Step 2: Heat the solution to 30°C, place the stirring probe into the solution, and adjust the speed to 500 rpm;

[0059] Step 3: After the purified solution reaches the set temperature, zinc powder (325-350 mesh, purity: 99.9 wt%) twice the theoretical amount of zinc powder is quickly added to the reaction system;

[0060] Step 4: Sample the purified solution every 2 minutes and analyze the copper ion content;

[0061] Results: After 8.5 min of stirring and intensified impurity removal reaction, the residual copper ion concentration in the solution was 251.5 mg / L, and the copper ion removal rate was 49.78%.

[0062] Table 1 is a comparative analysis of the copper removal effects of impingement flow, ultrasound, and stirring processes under the action of 2 times zinc powder at 30°C.

[0063]

[0064] Example 4:

[0065] Step 1: Prepare 1000ml of zinc sulfate solution containing copper ion impurities, with a pH of 4.2, where Zn 2+ The concentration is 150g / L, Cu 2+ The concentration is 500 mg / L;

[0066] Step 2: Place the prepared solution into the impinging stream mixing tank and maintain the solution temperature at 30°C;

[0067] Step 3: After the purified solution reaches the set temperature, zinc powder (particle size distribution of zinc powder: 325-350 mesh, purity: 99.9 wt%) twice the theoretical amount of zinc powder is quickly added to the reaction system;

[0068] Step 4: The mixed solution is diverted and accelerated through a dual-channel metering pump system, and then relatively coaxially collides through a nozzle, with the impact speed controlled at 50 m / s.

[0069] Step 5: The solution after impact is collected from the bottom of the reactor, enters the collection chamber, and returns to the mixing tank to prepare for a new round of impact.

[0070] Step 6: Sample the purified solution every 2 minutes and analyze the copper ion content;

[0071] Results: After 23 minutes of impinging stream enhanced impurity removal reaction, the residual copper ion concentration in the solution was 0.05 mg / L and the copper ion removal rate was 99.99%.

[0072] Example 5:

[0073] Step 1: Prepare 1000ml of zinc sulfate solution containing copper ion impurities, with a pH of 4.2, where Zn 2+ The concentration is 150g / L, Cu 2+ The concentration is 500 mg / L;

[0074] Step 2: Place the prepared solution into the impinging stream mixing tank and maintain the solution temperature at 30°C;

[0075] Step 3: After the purified solution reaches the set temperature, 1.5 times the theoretical amount of zinc powder is quickly added to the reaction system (zinc powder particle size distribution 325-350 mesh, purity: 99.9wt%);

[0076] Step 4: The mixed solution is diverted and accelerated through a dual-channel metering pump system, and then relatively coaxially collides through a nozzle, with the impact speed controlled at 50 m / s.

[0077] Step 5: The solution after impact is collected from the bottom of the reactor, enters the collection chamber, and returns to the mixing tank to prepare for a new round of impact.

[0078] Step 6: Sample the purified solution every 2 minutes and analyze the copper ion content;

[0079] Results: After 23 minutes of impinging stream enhanced impurity removal reaction, the residual copper ion concentration in the solution was 0.15 mg / L and the copper ion removal rate was 99.97%.

[0080] Example 6:

[0081] Step 1: Prepare 1000ml of zinc sulfate solution containing copper ion impurities, with a pH of 4.2, where Zn 2+ The concentration is 150g / L, Cu 2+ The concentration is 500 mg / L;

[0082] Step 2: Place the prepared solution into the impinging stream mixing tank and maintain the solution temperature at 30°C;

[0083] Step 3: After the purified solution reaches the set temperature, 1.2 times the theoretical amount of zinc powder is quickly added to the reaction system (zinc powder particle size distribution 325-350 mesh, purity: 99.9wt%);

[0084] Step 4: The mixed solution is diverted and accelerated through a dual-channel metering pump system, and then relatively coaxially collides through a nozzle, with the impact speed controlled at 50 m / s.

[0085] Step 5: The solution after impact is collected from the bottom of the reactor, enters the collection chamber, and returns to the mixing tank to prepare for a new round of impact.

[0086] Step 6: Sample the purified solution every 2 minutes and analyze the copper ion content;

[0087] Results: After 8.5 min of impinging stream enhanced impurity removal reaction, the residual copper ion concentration in the solution was 0.2 mg / L, and the copper ion removal rate was 99.96%.

[0088] Table 2 is the analysis of the removal effect of different zinc powder dosages at an impact speed of 50m / s and 30℃.

[0089]

[0090] The above description is merely a preferred embodiment of the present invention and the corresponding principles and experimental features. It should be noted that actual implementation examples include, but are not limited to, the above embodiments and are not to be construed as limiting the present invention. A person skilled in the art would be able to make various optimizations and improvements without departing from the principles and scope of the present invention, and such optimizations and improvements should also be considered within the scope of protection of the present invention.

Claims

1. A method for enhancing the zinc electrolyte purification reaction process based on impinging streams, characterized in that: The specific steps include: (1) First, the zinc sulfate solution to be purified is placed in a mixing tank, and the solution is heated to a set temperature value by a heating system; the solid purifier and the zinc sulfate solution to be purified are mixed, and then the mixed solution is accelerated and collides with each other by an impinging stream method; (2) After the solid purifier and the zinc sulfate solution to be purified are pressurized by a pressure water pump, they are immersed in the solution to achieve collision; (3) Adopt mixed solution circulation and multiple collision methods.

2. The method according to claim 1, wherein: In the step (1), the solid purifier is zinc powder, and the particle size of the zinc powder is ≤300 mesh.

3. The method according to claim 1, wherein: In the step (1), zinc powder is quickly added to the solution to be purified and stirred to make it uniformly mixed.

4. The method according to claim 1, wherein: In the step (1), the zinc sulfate solution to be purified is placed in a mixing tank, and the solution is heated to a set temperature value by a heating system; zinc powder is quickly added into the solution and stirred to be uniformly mixed.

5. The method according to claim 1, wherein: In the step (2), the uniformly mixed solution is divided and accelerated by a dual-channel metering pump system, and the accelerated solution enters the dual inlet channels of the impinging stream reactor and undergoes relative coaxial collision after passing through the nozzle.

6. The method of claim 1, wherein the method comprises: In the step (2), the nozzle spacing is 4 mm to 8 mm, and the impact velocity range is 10 m / s to 70 m / s.

7. The method of claim 1, wherein: The solution after the collision in step (3) will be collected at the bottom of the impinging flow reactor and enter the collection chamber, which is provided with a sampling port. After sampling and analysis, the solution that meets the standards is released in an open circuit, and the solution that does not meet the standards is returned to the mixing tank for a new round of impact strengthening process.

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