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Method of removing silver by adding magnesium to silver-containing tin alloy

A silver-tin alloy and magnesium alloy technology, applied in the field of non-ferrous metal pyrometallurgy, can solve the problems of inability to handle high-lead solder, high capital construction investment cost, inability to obtain purity, etc., and achieves improved resource utilization, convenient operation, lively effect

Active Publication Date: 2018-07-13
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method cannot obtain silver with higher purity, and the silver extraction effect is poor
In the patent with the publication number CN101033557, the zinc-silver alloy is melted and poured into an alloy block, and placed in an electrolytic cell equipped with an ion-exchange membrane for electrolysis. Hydrometallurgy inevitably has the disadvantages of serious pollution and high power consumption.
This method can only handle lead-free solder, and cannot handle high-lead solder
In the patent with the publication number CN102828042A, the treatment method for the silver-zinc shell in the crude tin is to use a centrifuge to separate it. The capital investment cost is high, and the temperature control is difficult. The silver-zinc shell is inevitably dissolved in the crude tin again, and the silver is extracted High silver content in post-crude tin
In the patent with the publication number CN 104928491A, zinc is added to silver-tin alloy to form slag and charcoal is floated up, and the purpose of tin-silver separation is achieved after being removed. Not high, and the density of zinc is not much different from that of tin. A large amount of zinc will remain in tin, which is not easy to remove by slag removal

Method used

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  • Method of removing silver by adding magnesium to silver-containing tin alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Such as figure 1 Shown, this adds magnesium to the method for removing silver in silver-containing tin alloy, and its concrete steps are as follows:

[0021] Step 1. First, heat 5t of silver-containing tin alloy (the content of silver in the silver-containing tin alloy is 1.0g / t, and the rest is tin) to 500°C to fully melt, and according to the molar ratio of tin and magnesium in the silver-containing tin alloy: 1: 3 Add magnesium, and pass argon into the crucible (argon flow rate is 1Nm 3 / h) local gas protection;

[0022] Step 2. Continue to heat up to 750°C, stir with eccentric mechanical stirring (the stirring speed of eccentric mechanical stirring is 600r / min) for 20 minutes, let it stand for 40 minutes, and after cooling down to room temperature, the lower layer of tin-magnesium alloy with obvious layering phenomenon (silver content 0.1g / t) and the upper layer of high-silver tin-magnesium alloy.

[0023] The tin-magnesium alloy in the lower layer of the above s...

Embodiment 2

[0025] Such as figure 1 Shown, this adds magnesium to the method for removing silver in silver-containing tin alloy, and its concrete steps are as follows:

[0026] Step 1. First, heat 5t of silver-containing tin alloy (the content of silver in the silver-containing tin alloy is 500g / t, and the rest is tin) to 600°C to fully melt, and follow the molar ratio of tin to magnesium in the silver-containing tin alloy of 1:2 Add magnesium, and pass argon in the crucible (argon flow rate is 0.5Nm 3 / h) local gas protection;

[0027] Step 2. Continue to heat up to 800°C, eccentric mechanical stirring (stirring speed of eccentric mechanical stirring is 600r / min) for 30 minutes, let stand for 50 minutes, and after cooling down to room temperature, the lower layer of tin-magnesium alloy with obvious layering phenomenon (silver content 0.2g / t) and the upper layer of high-silver tin-magnesium alloy.

[0028] The tin-magnesium alloy in the lower layer of the above step 2 is vacuum distill...

Embodiment 3

[0030] Such as figure 1 Shown, this adds magnesium to the method for removing silver in silver-containing tin alloy, and its concrete steps are as follows:

[0031] Step 1. First, heat 5t of silver-containing tin alloy (the content of silver in the silver-containing tin alloy is 50,000g / t, and the rest is tin) to 650°C to fully melt, and follow the molar ratio of tin to magnesium in the silver-containing tin alloy of 1:1 Add magnesium, and pass argon in the crucible (argon flow rate is 0.8Nm 3 / h) local gas protection;

[0032] Step 2. Continue to heat up to 850°C, eccentric mechanical stirring (stirring speed of eccentric mechanical stirring is 100r / min) for 25 minutes, let stand for 60 minutes, and after cooling down to room temperature, the lower layer of tin-magnesium alloy with obvious layering phenomenon (silver content 0.8g / t) and the upper layer of high-silver tin-magnesium alloy.

[0033] The tin-magnesium alloy in the lower layer of the above step 2 is vacuum dist...

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Abstract

The invention relates to a method of removing silver by adding magnesium to a silver-containing tin alloy, and belongs to the technical field of nonferrous metal pyrogenic process smelting. The methodcomprises the steps that the silver-containing tin alloy is molten fully, then magnesium powder is added to the molten silver-containing tin alloy, argon is supplied for partial gas protection, heating and eccentric mechanical stirring are carried out, standing and cooling to a room temperature are carried out, and thus a tin-magnesium alloy at the lower layer and a high-silver tin-magnesium alloy at the upper layer which are layered obviously are obtained. The method is simple in technology, convenient to operate and low in cost, required equipment is simple, the universality of raw materials is high, the method can treat tin alloys having a wide silver content range, and processes are safe and controllable.

Description

technical field [0001] The invention relates to a method for adding magnesium to a silver-containing tin alloy to remove silver, and belongs to the technical field of nonferrous metal pyrometallurgy. Background technique [0002] In daily life, there are a lot of silver-containing tin alloys in widely used high-silver solder, waste circuit boards and tin anode slime, and the silver recovered from these raw materials every year creates huge economic value. [0003] During the pyro-refining process of crude tin, most tin smelters use continuous spiral crystallizers to remove lead and bismuth to obtain crude solder. After the crude solder is vacuum distilled, most of the lead and bismuth with low vapor pressure and boiling point volatilize and enter condensation Lead-bismuth alloy is formed in the material, and the high-boiling silver remains in the residue to form crude tin, which will return to the spiral crystallizer again to remove silver, lead, bismuth and other high-boili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/02C22B11/02C22B25/08
CPCC22B9/006C22B9/02C22B11/02C22B25/08Y02P10/20
Inventor 李一夫张环杨斌刘大春龙萍徐宝强蒋文龙徐俊杰蒲正浩王双平
Owner KUNMING UNIV OF SCI & TECH
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