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High-efficiency and high-recovery-rate method for recovering industrial tin powder

A high recovery rate, industrial technology, applied in the chemical industry, can solve the problems of difficult remelting and recycling, fine particle size of tin powder, large amount of returned materials, etc., to achieve the effect of reducing energy consumption, rapid smelting, and improving recovery rate

Inactive Publication Date: 2017-08-04
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the centrifugal atomization method is a widely used tin powder production method in industrial production. This technology is characterized by high output, relatively easy atmosphere control, good product sphericity, and high yield. High-quality tin powder with narrow diameter distribution requires a large amount of returned material (about 75-80%), fine particle size of tin powder (main particle size is 38-75 μm), high surface energy, easy oxidation, and difficult to use Traditional resistance furnace heating method for remelting and recycling

Method used

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  • High-efficiency and high-recovery-rate method for recovering industrial tin powder

Examples

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Effect test

Embodiment 1

[0029] Use microwave melting to recover 18Kg of lead-free solder alloy powder, first weigh 18Kg of lead-free tin alloy powder to be recovered, the particle size of the tin powder is mainly 38~150µm, the mass percentage of tin is 96%, and the mass percentages of silver and copper are respectively 3% and 1%, pour metal tin powder into a silicon carbide crucible, place the crucible in a microwave-tight reaction chamber, evacuate until the vacuum degree is less than 1000Pa, and then fill it with nitrogen protection, the air pressure is 1.35×10 5 Pa, and then fed into the microwave, the microwave frequency is 2450±50MHz, and the total microwave power is 16 kW. After smelting for 8 minutes, the tin powder reaches above 500°C (as attached figure 2 shown), after 2 minutes of heat preservation, turn off the microwave source, stop feeding the protective gas, take out the crucible and cast an ingot (as shown in the attached image 3 shown). The average heating rate is 62.12℃ / min, the...

Embodiment 2

[0031] Use microwave melting to recover 20Kg of lead-free solder alloy powder. The particle size of tin powder is mainly 38~100µm, the mass percentage of tin is 96%, and the mass percentage of silver and copper is 3% and 1% respectively. Pour the metal tin powder into silicon carbide crucible, and place the crucible in a microwave-tight reaction chamber, vacuumize until the vacuum degree is less than 1000Pa, then fill it with nitrogen protection, the air pressure is 1.28×10 5 Pa, and then fed into 20kW microwave, the microwave frequency is 2450±50MHz. After smelting for 10 minutes, the tin powder reached 550°C. After 3 minutes of heat preservation, the microwave source was turned off, and the crucible was taken out for ingot casting. The average heating rate is 55℃ / min, the unit energy consumption of microwave melting tin powder is 0.17 (kW h / Kg), the tin recovery rate is 98.14%, and the slag rate is 1.55%.

Embodiment 3

[0033] Using microwave melting to recover 1.5Kg of lead-containing solder alloy powder, first weigh 1.5Kg of lead-containing tin alloy powder to be recovered. The particle size of the tin powder is mainly 38~75µm, the mass percentage of tin is 63%, and the lead content is 37%. Pour metal tin powder into a silicon carbide crucible, place the crucible in a microwave-tight reaction chamber, evacuate until the vacuum degree is less than 1000Pa, and then fill it with nitrogen protection, the air pressure is 1.33×10 5 Pa, and then fed into the microwave, the microwave frequency is 2450±50MHz, and the microwave power is 2.2 kW. The temperature rose to 234°C in 6 minutes of smelting, and 524°C in 11 minutes (see attached Figure 4 shown), turn off the microwave source after 4 minutes of heat preservation, take out the crucible and carry out ingot casting. The average heating rate is 47.63°C / min, the unit energy consumption is 0.26 (kW·h / Kg), the tin recovery rate is 97.79%, and the ...

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Abstract

The invention discloses a high-efficiency and high-recovery-rate method for recovering industrial tin powder. The high-efficiency and high-recovery-rate method for recovering the industrial tin powder comprises the steps of pretreatment, smelting and aftertreatment and specifically comprises the steps that the tin powder to be recovered is screened till the grain diameters are smaller than 200 micrometers; the tin powder to be recovered is loaded to a crucible, the crucible is put into an airtight microwave heating cavity, and then, under the protective gas, microwave smelting is carried out to obtain a material a; and the material a is cast into a final product, namely metallic tin or a tin alloy ingot. According to the high-efficiency and high-recovery-rate method for recovering the industrial tin powder, rapid smelting of the metallic tin powder and tin alloy powder can be achieved through microwave heating, and the method has the characteristics of high heating speed and high heat efficiency; by adjusting the microwave power, the metallic tin powder can be melted within 8-15 minutes; compared with a traditional method, the method has the beneficial effects that the smelting time is shortened by 10 times or above, the heating efficiency can be improved by 5 times, and the energy consumption can be reduced by about 80 %; smelting is carried out under the condition of nitrogen, argon or mixed gas protection, the technological process is simple, operation is easy, the production cost is low, safety is achieved, no pollution is caused, and the performance of the cast ingot is relatively excellent.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for recovering industrial tin powder with high efficiency and high recovery rate. Background technique [0002] Tin is an indispensable key rare metal in modern industry, widely used in electronics, information, electrical appliances, chemical industry, metallurgy, building materials, machinery, food packaging and other industries. The world's tin resources are mainly distributed widely, and my country is also rich in tin resources. However, the average content of tin in the earth's crust is only 0.004%, and the reserves are limited. Therefore, tin is a relatively scarce metal, especially in the past 20 years. There is almost no new tin. The mining of tin ore has caused a worldwide shortage of tin ore, and the contradiction has become increasingly prominent. At present, tin products are mainly solder and fusible alloy products for the electronic inf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B25/06
CPCC22B25/06Y02P10/20
Inventor 许磊彭金辉白海龙张利波郭胜惠韩朝辉彭巨擘巨少华周俊文刘秉国夏洪应吴庆田
Owner KUNMING UNIV OF SCI & TECH
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