Non-aluminium low-calcium lead-silver-calcium rare earth alloy and preparation method thereof

A rare earth alloy and rare earth metal technology, applied in the field of materials, can solve problems such as easy to exceed 0.005%, high product grade 1 yield, product grade decline, etc., achieve good corrosion resistance, low anodic oxide film resistance, and reduce smelting costs. Effect

Active Publication Date: 2010-02-24
苏向东
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, after more than ten years of industrial application of the lead-silver-calcium multi-element alloy rolling anode, it has been found that it mainly has the following two shortcomings: one is that the anode has a good effect in the first 3-5 months of use, but the later performance declines, Corrosion intensifies, causing the lead content in the obtained cathode zinc to easily ex

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Weigh 99.70 kg of No. 1 electrolytic lead and heat it to 450°C in the smelting furnace, and keep it warm after the lead is melted; weigh 0.09 kg of calcium, 0.15 kg of silver and 0.06 kg of No. 45 mixed rare earth metal, and then put them all into a feeding device During the process, the feeding device is quickly submerged in the lead liquid and stirred, and at the same time, a 36-volt DC potential difference is applied between the melt and the furnace, and the stirring is stopped after 40 minutes. Casting, after the alloy is solidified, the mold is opened to take out the anode blank, and then rolled and cut into an anode plate of 960×620×6 mm. After testing, the composition of the anode plate is: silver 0.149%, calcium 0.089%, rare earth metal 0.058%.

[0017] Tests on the obtained anode plate show that the tensile strength of the anode plate δ b =4.9kgf / mm 2 , can fully support its own weight, and will not warp or deform in the electrolytic cell to cause short circu...

Embodiment 2

[0019] Weigh 99.69 kg of No. 1 electrolytic lead and heat it to 460°C in the melting furnace, and keep it warm after the lead is melted; weigh 0.05 kg of calcium, 0.19 kg of silver and 0.07 kg of No. 45 mixed rare earth metal, and then put them all into a feeding device During the process, the feeding device is quickly submerged in the lead liquid and stirred, and at the same time, a 15V DC potential difference is applied between the alloy melt and the furnace, and the stirring is stopped after 30 minutes. Pouring into the mold, after the alloy is solidified, the mold is opened to take out the anode blank, and then rolled and cut into an anode plate of 960×620×6 mm. After testing, the composition of the anode plate is: silver 0.189%, calcium 0.048%, rare earth metal 0.067%.

[0020] Tests on the obtained anode plate show that the tensile strength of the anode plate δ b =4.5kgf / mm 2 , can fully support its own weight, and will not warp or deform in the electrolytic cell to ca...

Embodiment 3

[0022] Weigh 99.25 kg of No. 1 electrolytic lead and heat it to 480°C in the melting furnace, and keep it warm after the lead is melted; weigh 0.03 kg of calcium, 0.7 kg of silver and 0.02 kg of No. 40 mixed rare earth metal, and then put them all into a feeding device During the process, the feeding device was quickly submerged in the lead liquid and stirred, and at the same time, a 3-volt DC potential difference was applied between the alloy melt and the furnace, and the stirring was stopped after 40 minutes, and the oxide slag on the surface of the melt was removed after standing still for 50 minutes. Pouring into the mold, after the alloy is solidified, the mold is opened to take out the anode blank, and then cold rolled and cut into an anode plate of 960×620×6 mm. After testing, the composition of the anode plate is: silver 0.69%; calcium 0.028%; rare earth metal 0.017%.

[0023] Tests on the obtained anode plate show that the tensile strength of the anode plate δ b =3.8...

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PUM

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Abstract

The invention discloses a non-aluminium low-calcium lead-silver-calcium rare earth alloy and a preparation method thereof; the non-aluminium low-calcium lead-silver-calcium rare earth alloy comprisesthe following components by weight percent: 0.15 to 0.7 percent of silver, 0.03 to 0.09 percent of calcium, 0.02 to 0.08 percent of rare earth metal, and the balance lead. The preparation method comprises the following steps: raising the temperature to 400 to 500 DEG C, to melt the lead in a lead-melting furnace and then holding the temperature; adding the silver, calcium and rare earth metal withweight ratio in lead solution, stirring, and applying a direct-current potential difference of 3 to 36V between a melt and the furnace in the stirring process; standing 30 to 50 minutes after the melt is evenly alloyed, removing oxidizing slag on the surface of the melt and obtaining the non-aluminium low-calcium lead-silver-calcium rare earth alloy. The invention is characterized by low impedance of an anodic oxide film, good corrosion resistance and long service life.

Description

technical field [0001] The invention relates to the field of material technology, in particular to an aluminum-free and low-calcium lead-silver-calcium rare earth alloy, and also relates to a preparation method thereof. Background technique [0002] In the 1980s, Canadian Cominco Corporation successfully developed a lead-silver-calcium multi-element alloy (containing silver: 0.25%; containing 0.1% calcium; containing 0.05% aluminum; the balance of lead) rolling anodes for electrolytic extraction of metal zinc. This alloy is widely used in the field of electrolytic extraction of metal zinc in sulfate aqueous solution as the replacement product of the traditional lead-silver alloy (containing 1% silver; the balance of lead), which is different from the traditional lead-silver alloy containing 1% silver Alloy casting anodes have the following three outstanding advantages: one is to save 80% of silver and reduce the cost of the alloy; the other is the high strength of the alloy ...

Claims

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Application Information

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IPC IPC(8): C22C11/00C22C1/02
Inventor 苏向东
Owner 苏向东
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