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A kind of method that reclaims tin and palladium from spent acidic palladium-containing sensitization solution

A technology of sensitizing liquid and acidity is applied in the field of recycling palladium-containing sensitizing waste liquid, which can solve problems such as inapplicability and achieve the effect of ensuring the recovery rate.

Active Publication Date: 2018-01-26
盛隆资源再生(无锡)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method solves the problem of recovery very well, but it is obviously not suitable for wastewater with high acidity and high salinity

Method used

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  • A kind of method that reclaims tin and palladium from spent acidic palladium-containing sensitization solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Get 1000mL of the acidic waste palladium-containing sensitizing solution from the production line of a certain circuit board manufacturer, and add a caustic soda solution with a concentration of 20wt% to neutralize the acidic palladium-containing sensitizing solution to pH=7; continue to add 50 g of caustic soda, and heat to 95 ℃ Dissolving and transforming for 1.5 hours, the tin is completely converted to sodium stannate, and the tin content is less than 0.01% according to the precipitation; 950mL sodium stannate solution enters the flat electrolytic cell for electrolysis, and the current density is 5A / cm 2 The temperature was controlled at 80°C to obtain electrolytic tin sheets; the palladium-containing precipitate was dissolved with hydrochloric acid, adjusted to pH = 14 with ammonia water, and 5 mL of formaldehyde was added as a reducing agent for palladium purification. After purification, 0.1 g of palladium sponge was obtained by reduction, with a purity of 99.99%....

Embodiment 2

[0025] Get the acidic waste palladium-containing sensitizing solution 2000mL of the production line of a certain circuit board manufacturer, add the electrolytic tin extraction tail liquid acidic palladium-containing sensitizing solution in Example 1 and neutralize to pH=7; continue to add caustic soda 400g, be heated to Dissolving and transforming at 100°C for 2 hours, tin is completely converted to sodium stannate, and the tin content is less than 0.01% according to precipitation; 3000mL sodium stannate solution enters a flat electrolytic cell for electrolysis, and the current density is 15A / cm 2 The temperature was controlled at 80°C to obtain electrolytic tin sheets; the palladium-containing precipitate was dissolved with hydrochloric acid, adjusted to pH = 14 with ammonia water, and 10 mL of formaldehyde was added as a reducing agent for palladium purification. After purification, 0.3 g of palladium sponge was obtained by reduction, with a purity of 99.99%.

Embodiment 3

[0027] Get 1000mL of acidic waste palladium-containing sensitizing solution from the production line of a circuit board manufacturer, and add a caustic soda solution with a concentration of 20wt% to neutralize the acidic palladium-containing sensitizing solution to pH=8; ℃ Dissolving and transforming for 1.5 hours, the tin is completely converted to sodium stannate, and the tin content is less than 0.01% according to the precipitation; 950mL sodium stannate solution enters the flat electrolytic cell for electrolysis, and the current density is 20A / cm 2 The temperature was controlled at 70°C to obtain electrolytic tin sheets; the palladium-containing precipitate was dissolved with hydrochloric acid, adjusted to pH = 13 with ammonia water, and 10 mL of formaldehyde was added as a reducing agent for palladium purification. After purification, 0.13 g of palladium sponge was obtained by reduction, with a purity of 99.99%.

[0028] The electrolytic cell of Examples 1-3 adopts the ti...

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Abstract

The invention discloses a method for recovering tin and palladium from waste acidic palladium-containing sensitizing liquid. The acid waste palladium-containing sensitizing liquid is neutralized, converted, filtered, dissolved, electrolyzed and purified to obtain metal tin, and palladium respectively. There are two kinds of sponge palladium products, so that the valuable metals in the waste acidic palladium-containing sensitization solution can be efficiently utilized. The treatment process of the invention is simple in operation, clean in energy, low in cost and friendly in environment.

Description

technical field [0001] The invention relates to the technical field of recovery and utilization of palladium-containing sensitized waste liquid, in particular to a method for recovering tin and palladium from waste acidic palladium-containing sensitized liquid. Background technique [0002] Palladium-containing sensitizing solution is widely used in metallization of printed circuit board holes and ABS plastic plating. During use and placement, because the tin protochloride in the sensitizing solution is continuously consumed by the oxidation of oxygen in the air, the final activation solution will produce precipitation. At the initial stage of decomposition of the sensitizing solution, almost all palladium is concentrated in the sediment, and the content of palladium in the raffinate is very small, but as time goes on, palladium will redissolve in water, so the discarded palladium-containing sensitizing solution contains about 1-2% tin and 0.005-0.02% palladium. Although t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C1/14C22B11/00C22B7/00
CPCC22B7/008C22B11/042C25C1/14Y02P10/20
Inventor 郎超樊锐万园园周欢欢
Owner 盛隆资源再生(无锡)有限公司