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Method for recycling lead-tin in silver separating residue of copper anode slime of circuit board

A technology for copper anode slime and silver separation slag is applied in the direction of improving process efficiency, which can solve problems such as short treatment process flow, and achieve the effects of simple and easy process, reduction of waste water discharge and cost reduction.

Active Publication Date: 2009-10-14
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is mainly to solve the problem of recovery of lead and tin in anode slime silver slag, which can not only ensure the effective recovery of lead and tin valuable metals in silver slag, but also has short treatment process and simple equipment

Method used

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  • Method for recycling lead-tin in silver separating residue of copper anode slime of circuit board

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Add 250g of water, 20g of hydrochloric acid, 50g of calcium chloride, and 30g of sodium chloride to 50g of silver slag, and stir at 80°C for 0.5h; filter to obtain lead liquid and lead slag, replace lead liquid with excess iron powder, and filter to obtain Sponge lead and liquid after replacement, adjust the pH value of the liquid after replacement with sodium hydroxide until no precipitation occurs, and return the liquid after iron sinking to the lead separation process; add 5g of sodium hydroxide and 1g of sodium nitrate to the lead residue, and mix well; roast at 350°C 1.5h; place the calcined sand in the air for 24h, add 150g of water, stir for 0.5h, and filter to obtain sodium stannate. The lead recovery rate is 95.3%, and the tin recovery rate is 98.2%.

Embodiment 2

[0014] Add 100g of silver-separating slag to Example 1, 200g of iron-sinking liquid, 500g of water, 25g of hydrochloric acid, 70g of calcium chloride, 100g of sodium chloride, and stir for 1 hour at 75°C; Replace excess iron powder, filter to obtain sponge lead and replaced liquid, adjust the pH value of the replaced liquid with sodium hydroxide until no precipitation occurs, and return the liquid after iron sinking to the lead separation process; add 20g of sodium hydroxide and nitric acid to the lead slag Sodium 4g, mix evenly; roast at 420°C for 1h; place the roasted sand in air for 30h, add 400g of water, stir for 1h, filter to obtain sodium stannate. The lead recovery rate is 93.7%, and the tin recovery rate is 99.1%.

Embodiment 3

[0016] Add 50g of silver-separating slag to Example 2, 200g of the solution after iron precipitation, 50g of water, 5g of hydrochloric acid, 30g of calcium chloride and 20g of sodium chloride, and stir for 2h at 95°C; Replace excess iron powder, filter to obtain sponge lead and replaced liquid, adjust the pH value of the replaced liquid with sodium hydroxide until no precipitation occurs, and return the liquid after iron sinking to the lead separation process; add 7g of sodium hydroxide and nitric acid to the lead slag Sodium 2g, mixed evenly; roasted at 450°C for 2h; put the calcined sand in the air for 48h, add 250g of water, stir for 0.5h, filter to obtain sodium stannate. The lead recovery rate is 94.1%, and the tin recovery rate is 97.8%.

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Abstract

The invention discloses a method for recycling lead-tin in silver separating residue of copper anode slime of a circuit board and relates to a method for recycling silver separating residue of copper anode slime of the circuit board by a wetting method. The method comprises the following steps of: stirring silver separating residue, water, hydrochloric acid, calcium chloride and sodium chloride for 0.5 to 2.0h under proper temperature according to requirements, filtering and obtaining lead separating liquid and lead separating residue; carrying out displacement to the lead separating liquid by using excess iron powder, filtering and obtaining spongy lead and displaced liquid; using sodium hydroxide to adjust pH value of the displaced liquid till the precipitate is not generated; and returning lead separating procedure after the iron is precipitated. The lead separating residue, the sodium hydroxide and sodium nitrate are mixed evenly to carry out roasting with the temperature of 350 to 500 DEG C, and then are added with water and filtered, thus obtaining the sodium stannate. Compared with the prior art, due to the adoption of a full-wetting process, the method reduces a large amount of waste gas and dusts in the process of pyrometallurgical treatment; the liquid after the iron is precipitated contains the main compositions of hydrochloric acid and sodium chloride; and the method can return acid pickling procedure, reduce discharge of waste water and lower cost, and is characterized by simple technique, no pollution and the like.

Description

technical field [0001] The invention relates to a method for wet recovery of lead and tin from anode slime, in particular to a method for wet recovery of silver slag, lead and tin from copper anode slime of circuit boards. Background technique [0002] Silver separation slag is the residue after extracting precious metals such as gold, silver, platinum, palladium and copper, selenium, tellurium and other valuable elements from copper anode slime. Copper anode slime is composed of elements with higher potential than copper and various substances insoluble in electrolyte during the electrolytic refining process. Its composition mainly depends on the composition of copper anode, casting quality and electrolysis technical conditions, and its yield is generally 0.2 to 0.8%; it usually contains Au, Ag, Cu, Pb, Se, Te, As, Sb, Bi, Ni, Fe, S, Sn, SiO 2 、Al 2 o 3 , platinum group metals and moisture. Anode slime derived from copper sulfide concentrate contains more Cu, Se, Ag, Pb...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B25/06C22B13/00C22B3/10C22B3/46
CPCY02P10/20
Inventor 张深根潘德安田建军李彬
Owner UNIV OF SCI & TECH BEIJING
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