Pb-Ag-Pr anode plate for zinc hydrometallurgy electrodeposition and preparation method of Pb-Ag-Pr anode plate

Abstract

The invention discloses a Pb-Ag-Pr anode plate for zinc hydrometallurgy electrodeposition and a preparation method of the Pb-Ag-Pr anode plate. The Pb-Ag-Pr anode plate for zinc hydrometallurgy electrodeposition comprises the following components: 0.3 to 1 percent of Ag, 0.05 to 0.1 percent of Pr and the balance of Pb and inevitable impurities. The preparation method comprises the following steps: dissolving a 1 # lead ingot, heating to 640-660 DEG C, adding the Pb-Pr alloy and the Pb-Ag alloy into the lead liquid, casting when the temperature is reduced to 550-570 DEG C, and carrying out plate surface processing, beam casting and welding to obtain the target Pb-Ag-Pr anode plate for zinc hydrometallurgy electrodeposition. The lead-silver anode is applied to the zinc hydrometallurgy electrodeposition process, and compared with a traditional lead-silver anode, the effects of improving the corrosion resistance of an anode plate and reducing the lead content of a cathode zinc sheet are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of metallurgy, and in particular relates to a Pb-Ag-Pr anode plate for hydrometallurgical zinc electrowinning and a preparation method thereof. Background Art

[0002] Hydrometallurgy has technical advantages such as low energy consumption, low pollution, low investment and low production cost. It has a large application scale in the metallurgical field, especially in the hydrometallurgical zinc industry. More than 85% of the world's zinc production capacity adopts hydrometallurgical zinc. The mainstream process of hydrometallurgical zinc is high-temperature roasting of zinc concentrate, leaching, purification, electrolysis and other processes. The electrolysis process is one of the core processes of hydrometallurgy. The principle is to use inert materials as anodes and aluminum as cathodes. After direct current is passed, the zinc ions in the electrolyte accept electrons and deposit on the cathode plate to form metallic zinc, and the anode surface releases electrons to produce oxygen. The corrosion resistance and catalytic activity of the anode plate are the core properties that affect the energy consumption of the electrolytic process, the quality of the cathode zinc and the production cost. At present, the anode plate of the zinc electrolytic industry is mainly a lead-silver binary alloy anode, which has technical advantages such as stable production technology, low cost and high efficiency. However, the anode plate surface strength of this material is small, the corrosion resistance is poor, and the anode oxygen evolution potential is high, resulting in problems such as poor zinc quality, short anode service life, and high DC power consumption. With the gradual consumption of high-quality zinc concentrate, in order to continuously meet industrial needs, various zinc concentrates are gradually used to produce metallic zinc. Some zinc concentrates have high fluorine and chlorine content, which has a high corrosion rate on the anode plate, seriously affecting the service life of the anode plate and the quality of the cathode zinc. Therefore, it is very necessary to develop a product that can solve the above technical problems. Summary of the invention

[0003] The first object of the present invention is to provide a Pb-Ag-Pr anode plate for hydrometallurgical zinc electrowinning, and the second object is to provide a method for preparing the Pb-Ag-Pr anode plate for hydrometallurgical zinc electrowinning.

[0004] The first object of the present invention is achieved in that the composition of the Pb-Ag-Pr anode plate for hydrometallurgical zinc electrowinning is 0.3-1% Ag, 0.05-0.1% Pr, and the remainder is Pb and unavoidable impurities.

[0005] The second object of the present invention is achieved by first melting the No. 1 lead ingot, heating it to 640-660°C, adding Pb-Pr alloy and Pb-Ag alloy into the lead liquid, and casting it when the temperature drops to 550-570°C. After plate surface processing, beam casting and welding, the target Pb-Ag-Pr anode plate for wet zinc electrowinning is obtained.

[0006] The Pb-Pr alloy is prepared by adding a 1# lead ingot into a medium frequency furnace for melting, heating it to 820-840°C, wrapping the Pr ingot with aluminum foil, placing it in a bell jar, and pressing it into the molten lead liquid for 5 minutes; when the temperature continues to rise to 840-860°C, heating is stopped, and when the temperature drops to 580-600°C, casting is performed to prepare a Pb-Pr (10%) intermediate alloy.

[0007] The Pb-Ag alloy is prepared by adding a 1# lead ingot into a medium frequency furnace for melting, heating it to 550-570°C, adding an Ag ingot into the molten lead liquid, melting it for 10 minutes, stopping heating, and casting it when the temperature drops to 500-520°C to prepare a Pb-Ag (20%) intermediate alloy.

[0008] The blank plate casting is to first put the 1# lead ingot into the medium frequency furnace, wait for the lead to melt, and when the temperature rises to 640-660°C, add the Pb-Pr alloy and Pb-Ag alloy into the lead liquid, and when the temperature drops to 550-570°C, cast it, wherein the blank plate casting mold is preheated to 150-170°C. Its composition is Pb-Ag (0.3-1%)-Pr (0.05-0.1%), and the thickness is 48-50mm.

[0009] The plate surface processing is that after the rough plate is aged at room temperature for 60 hours, the rough plate is rolled from 4 directions, and the rolling pass is more than 7 times until it reaches 7-9 mm; after the rolled plate surface is aged at room temperature for 24 hours, it is sheared and drilled. The detailed distribution is as follows Figure 1 .

[0010] The polar plate crossbeam casting comprises: brushing a "7" or "1" shaped copper beam to remove surface oil stains, then tinning the surface, placing the tinned copper beam in a mold, pouring 350°C lead liquid into the mold, and wrapping the tinned copper beam to form a copper-lead crossbeam.

[0011] The welding is to weld the copper-lead beam and the plate surface by using combustion-supporting gas O2 and combustible gas C2H2.

[0012] The method of the present invention adds rare earth Pr when making the anode plate. Pr in the lead alloy anode can promote the growth of the β-type lead oxide film layer on the surface of the plate, reduce the resistance of the oxide film, and improve the current efficiency of the plate during use. The present invention is applied to the hydrometallurgical zinc electrowinning process, and compared with the traditional lead-silver anode, it plays a role in improving the corrosion resistance of the anode plate and reducing the lead content of the cathode zinc sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a detailed distribution diagram of shearing and drilling in the plate surface processing of the present invention. DETAILED DESCRIPTION

[0014] The present invention is further described below in conjunction with the embodiments, but the present invention is not limited in any way. The examples described in the present invention are only descriptions of the preferred test methods of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, any modifications and improvements made based on the teachings of the present invention should fall within the scope of the present invention.

[0015] The composition of the Pb-Ag-Pr anode plate for hydrometallurgical zinc electrowinning of the present invention is 0.3-1% Ag, 0.05-0.1% Pr, and the remainder is Pb and inevitable impurities.

[0016] The Pb-Ag-Pr anode plate for hydrometallurgical zinc electrowinning is cast using Pb-Pr alloy, Pb-Ag alloy and lead as raw materials.

[0017] The preparation method of the Pb-Pr alloy is as follows: after melting a No. 1 lead ingot, the Pr ingot is wrapped with aluminum foil and placed in a bell jar, and then pressed into molten lead liquid, and after melting, casted to prepare a Pb-Pr intermediate alloy.

[0018] The preparation method of the Pb-Pr alloy comprises the following steps: melting a No. 1 lead ingot, heating it to 820-840°C, wrapping the Pr ingot with aluminum foil, placing it in a bell jar, and pressing it into molten lead liquid for a melting time of 4-6 minutes. When the temperature continues to rise to 840-860°C, heating is stopped, and when the temperature drops to 580-600°C, casting is performed to prepare the Pb-Pr intermediate alloy.

[0019] The Pb-Ag alloy is prepared by melting a No. 1 lead ingot, adding an Ag ingot into the molten lead liquid, and casting the melted lead ingot to prepare the Pb-Ag intermediate alloy.

[0020] The Pb-Ag alloy is prepared by melting a No. 1 lead ingot, heating it to 550-570°C, adding an Ag ingot into the molten lead liquid, melting it for 8-12 minutes, stopping heating, and casting it when the temperature drops to 500-520°C to prepare the Pb-Ag intermediate alloy.

[0021] The preparation method of the Pb-Ag-Pr anode plate for wet zinc electrowinning of the present invention comprises the following steps: firstly, a No. 1 lead ingot is melted, and when the temperature is raised to 640-660° C., a Pb-Pr alloy and a Pb-Ag alloy are added to the lead liquid, and when the temperature drops to 550-570° C., casting is performed, and the target Pb-Ag-Pr anode plate for wet zinc electrowinning is obtained through rolling, beam casting and welding.

[0022] The plate surface processing is to roll the blank plate from four directions after aging at room temperature for 60 hours, with more than 7 rolling passes until it reaches 9mm. After the pressed plate surface is aged at room temperature for 24 hours, it is sheared and drilled.

[0023] The welding is to weld the copper-lead beam and the punching plate by using combustion-supporting gas O2 and combustible gas C2H2.

[0024] The present invention will be further described below with specific embodiments: Example 1 Preparation of Pb-Pr alloy: Add 1# lead ingot into the medium frequency furnace for melting, and when the temperature rises to 820℃, wrap the Pr ingot with aluminum foil and put it into the bell jar, and press it into the molten lead liquid for 5 minutes; when the temperature continues to rise to 840℃, stop heating, and when the temperature drops to 580℃, cast it to prepare a Pb-Pr (10%) intermediate alloy.

[0025] Preparation of Pb-Ag alloy: Add 1# lead ingot into the medium frequency furnace for melting, and when the temperature rises to 550℃, add Ag ingot into the molten lead liquid. The melting time is 10min, and then stop heating. When the temperature drops to 500℃, cast it to prepare Pb-Ag (20%) intermediate alloy.

[0026] 1.2m 2 Preparation of rough board: First put the 1# lead ingot into the medium frequency furnace, wait for the lead to melt, and when the temperature rises to 640℃, add Pb-Pr alloy and Pb-Ag alloy into the lead liquid, and when the temperature drops to 550℃, cast it, and preheat the rough board casting mold to 150℃. Its composition is Pb-Ag (0.5%)-Pr (0.07%), and the thickness is 48mm.

[0027] After the rough plate is aged at room temperature for 60 hours, the rough plate is rolled from 4 directions with more than 7 rolling passes until it reaches 7 mm; after the rolled plate surface is aged at room temperature for 24 hours, it is sheared and drilled.

[0028] Plate beam casting: brush the "7-shaped" copper beam used for the anode plate of the middle tank, remove the surface oil, tin it, place the tinned copper beam in the mold, pour 350℃ lead liquid into the mold, wrap the tinned copper beam to form a copper-lead beam. Use combustion-supporting gas O2 and combustible gas C2H2 to weld the copper-lead beam to the punching plate.

[0029] Example 2 Preparation of Pb-Pr alloy: After adding 1# lead ingot into the medium frequency furnace for melting, when the temperature rises to 840℃, wrap the Pr ingot with aluminum foil and put it into the bell jar, and press it into the molten lead liquid for 5 minutes; when the temperature continues to rise to 860℃, stop heating, and when the temperature drops to 600℃, cast it to prepare a Pb-Pr (10%) intermediate alloy.

[0030] Preparation of Pb-Ag alloy: Add 1# lead ingot into the medium frequency furnace for melting, and when the temperature rises to 570℃, add Ag ingot into the molten lead liquid. The melting time is 10min, and then stop heating. When the temperature drops to 520℃, cast it to prepare Pb-Ag (20%) intermediate alloy.

[0031] 1.6m 2 Preparation of rough board: First put the 1# lead ingot into the medium frequency furnace, wait for the lead to melt, and when the temperature rises to 660℃, add Pb-Pr alloy and Pb-Ag alloy into the lead liquid, and when the temperature drops to 570℃, cast it, and preheat the rough board casting mold to 170℃. Its composition is Pb-Ag (0.8%)-Pr (0.1%), and the thickness is 50mm.

[0032] After the rough plate is aged at room temperature for 60 hours, the rough plate is rolled from 4 directions with more than 7 rolling passes until it reaches 9mm; after the rolled plate surface is aged at room temperature for 24 hours, it is sheared and drilled.

[0033] Plate beam casting: brush the "1" copper beam used for the side tank anode plate, remove the surface oil, tin it, put the tinned copper beam in the mold, pour 350℃ lead liquid into the mold, wrap the tinned copper beam to form a copper-lead beam. Use combustion-supporting gas O2 and combustible gas C2H2 to weld the copper-lead beam to the punching plate.

Claims

1. A Pb-Ag-Pr anode plate for hydrometallurgical zinc electrowinning, characterized in that: The composition of the Pb-Ag-Pr anode plate for hydrometallurgical zinc electrowinning is 0.3-1% Ag, 0.05-0.1% Pr, and the remainder is Pb and inevitable impurities.

2. The Pb-Ag-Pr anode plate for zinc hydrometallurgy electrowinning according to claim 1, characterized in that: The Pb-Ag-Pr anode plate for hydrometallurgical zinc electrowinning is cast using Pb-Pr alloy, Pb-Ag alloy and lead as raw materials.

3. The Pb-Ag-Pr anode plate for zinc hydrometallurgy electrowinning according to claim 2, characterized in that: The preparation method of the Pb-Pr alloy is as follows: after melting a No. 1 lead ingot, the Pr ingot is wrapped with aluminum foil and placed in a bell jar, and then pressed into molten lead liquid, and after melting, casted to prepare a Pb-Pr intermediate alloy.

4. The Pb-Ag-Pr anode plate for zinc hydrometallurgy electrowinning according to claim 3, characterized in that: The preparation method of the Pb-Pr alloy comprises the following steps: melting a No. 1 lead ingot, heating it to 820-840°C, wrapping the Pr ingot with aluminum foil, placing it in a bell jar, and pressing it into molten lead liquid for a melting time of 4-6 minutes. When the temperature continues to rise to 840-860°C, heating is stopped, and when the temperature drops to 580-600°C, casting is performed to prepare the Pb-Pr intermediate alloy.

5. The Pb-Ag-Pr anode plate for zinc hydrometallurgy electrowinning according to claim 2, characterized in that: The Pb-Ag alloy is prepared by melting a No. 1 lead ingot, adding an Ag ingot into the molten lead liquid, and casting the melted lead ingot to prepare the Pb-Ag intermediate alloy.

6. The Pb-Ag-Pr anode plate for zinc hydrometallurgy electrowinning according to claim 5, characterized in that: The Pb-Ag alloy is prepared by melting a No. 1 lead ingot, heating it to 550-570°C, adding an Ag ingot into the molten lead liquid, melting it for 8-12 minutes, stopping heating, and casting it when the temperature drops to 500-520°C to prepare the Pb-Ag intermediate alloy.

7. A method for preparing a Pb-Ag-Pr anode plate for zinc hydrometallurgy electrowinning according to any one of claims 1 to 6, characterized in that: First, the 1# lead ingot is melted, and when the temperature is raised to 640-660°C, Pb-Pr alloy and Pb-Ag alloy are added into the lead liquid. When the temperature drops to 550-570°C, casting is carried out. After plate surface processing, beam casting and welding, the target Pb-Ag-Pr anode plate for wet zinc electrowinning is obtained.

8. The preparation method according to claim 7, characterized in that: The plate surface processing is to roll the blank plate from four directions after aging at room temperature for 60 hours, with more than 7 rolling passes until it reaches 9mm. After the pressed plate surface is aged at room temperature for 24 hours, it is sheared and drilled.

9. The preparation method according to claim 7, characterized in that: The welding is to weld the copper-lead beam and the punching plate by using combustion-supporting gas O2 and combustible gas C2H2.

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