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Method for preparing dilute nitric acid, sponge tin and polymeric aluminum through spent tin-fading liquid

A technology of polyaluminum chloride and dilute nitric acid, applied in aluminum chloride, nitric acid, aluminum halide and other directions, can solve the problems of not realizing resource utilization, poor separation efficiency, difficult operation, etc., and achieve easy processing, mild process reaction, simple steps

Active Publication Date: 2016-02-03
盛隆资源再生(无锡)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

3. The products for producing tin are typically described in their patents such as Liao Weifeng to prepare barium stannate products using tin in the waste tin stripping liquid, but its disadvantage is that the method also contains a large amount of acid and other substances in the waste tin stripping liquid. The resource utilization of metals has not been realized, and a large amount of waste liquid and sludge are produced in the process of preparing trihydrate and barium stannate. How to deal with these waste liquids and sludge is also a problem that needs to be solved
However, the invention process also has certain limitations, mainly in two aspects, one is the quality of the main valuable metal tin resource products, such as the product metastannic acid has a strong adsorption to iron, and iron cannot be removed by simple washing , so it is inevitable that only tin dioxide with a yellow color and low taste can be obtained. Generally, tin dioxide is used in the ceramic industry, and its yellow color will limit its use. The final destination of the tin dioxide obtained by this process is likely to be The smelter uses the conventional smelting process to obtain metal tin; on the other hand, when the melting point is used to separate ferric nitrate and copper nitrate, since both contain nitrate and generally contain crystal water, when the temperature is high, the crystal water will be free, and the copper nitrate will dissolve. In this part of the water, the separation efficiency is poor, and it is difficult to operate under high temperature and high acidity

Method used

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  • Method for preparing dilute nitric acid, sponge tin and polymeric aluminum through spent tin-fading liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Take 1000mL of waste tin stripping solution from the production line of a PCB manufacturer, heat the waste tin stripping solution to 75°C through a steam spacer, and circulate the feed under a vacuum of -0.05MPa for vacuum distillation to obtain 800mL of dilute nitric acid and 200mL of tin sludge; After separating the obtained 200mL tin sludge, add 200mL water to it and stir for 15 minutes, heat up to 50°C, add water to adjust the acidity to 35%, add 16mL of 0.05wt% flocculant solution, and stir for 1 hour. Set aside for 15 minutes to recover the supernatant and the lower layer of tin sludge; collect the recovered tin sludge and wash it twice to obtain the lower layer of tin sludge A; then mix all the supernatants to obtain supernatant B; Solution B is placed in a self-made electrolytic cell, and copper is recovered by electrolysis. After the copper is extracted, the electrolytic tail liquid can be used as dilute nitric acid product through concentration and enrichment; ...

Embodiment 2

[0036]Take 1000mL of waste tin stripping solution from the production line of a PCB manufacturer, heat the waste tin stripping solution to 80°C through a steam spacer, and circulate the feed under a vacuum of -0.04MPa for vacuum distillation to obtain 800mL of dilute nitric acid and 200mL of tin sludge; After separating the obtained 200mL tin sludge, add 300mL water therein and stir for 30 minutes, raise the temperature to 65°C, add water to adjust the acidity to 40%, add 0.1wt% flocculant solution 20mL, and stir for 1.5 hours, after the stirring is finished, stand still Set aside for 20 minutes to recover the supernatant and the lower layer of tin sludge; collect the recovered tin sludge and repeat the cleaning 3 times to obtain the lower layer of tin sludge A; then mix all the supernatants to obtain supernatant B; Solution B is placed in a self-made electrolytic cell, and copper is recovered by electrolysis. After the copper is extracted, the electrolytic tail liquid can be u...

Embodiment 3

[0038] Take 1000mL of waste tin stripping solution from the production line of a PCB manufacturer, heat the waste tin stripping solution to 85 degrees through a steam spacer, and circulate the feed under a vacuum of -0.03MPa for vacuum distillation to obtain 800mL of dilute nitric acid and 200mL of tin sludge; After separating the obtained 200mL tin sludge, add 400mL water therein and stir for 60 minutes, raise the temperature to 80°C, add water to adjust the acidity to 50%, add 22mL of 0.15wt% flocculant solution, and stir for 2 hours, after the stirring ends, stand still Set aside for 30 minutes to reclaim the supernatant and the lower layer of tin sludge; collect the recovered tin sludge and repeat the cleaning 4 times to obtain the lower layer of tin sludge A; then mix all the supernatants to obtain supernatant B; Solution B is placed in a self-made electrolytic cell, and copper is recovered by electrolysis. After the copper is extracted, the electrolytic tail liquid can be...

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Abstract

The invention discloses a method for preparing dilute nitric acid, sponge tin and polymeric aluminum through spent tin-fading liquid. The method comprises the steps that 1, the spent tin-fading liquid is heated through a steam spacer bush, and cycled feeding and reduced pressure distillation are carried out to obtain dilute nitric acid and tin slime; 2, water is added into the tin slime, a flocculant solution is added, stirring is carried out, and supernate and lower-layer tin slime are recycled; 3, the tin slime is collected, the step 2 is repeatedly executed to obtain lower-layer tin slime A; the supernate in the step 2 and supernate in the step 3 are mixed to obtain supernate B; 4, the supernate B is placed in an electrolytic bath for electrolysis and recycling of copper, and electrolysis tail liquid can be used as a dilute nitric acid product through concentration and enrichment; 5, concentrated hydrochloric acid is added into the low-layer tin slime A, and stirring and dissolving are carried out to obtain a solution C; 6, water is added into the solution C, an aluminum sheet is placed in, the prepared flocculant solution is added, filtering is carried out, and the sponge tin and the polymeric aluminum are obtained. The processing technology is easy to implement, no secondary solid waste is produced, the dilute nitric acid, the sponge tin and the polymeric aluminum can be obtained at the same time, and economic benefits are good.

Description

technical field [0001] The present application relates to the technical field of waste water recovery and treatment, in particular to a method for recovering dilute nitric acid, sponge tin and polyaluminum chloride in waste tin stripping liquid. Background technique [0002] The nitric acid type tin stripper has the advantages of fast tin stripping speed and high selectivity, and is widely used in the production of printed circuit boards. With the continuous progress of tin stripping, the concentration of tin in the system will inevitably continue to rise. When the concentration of tin reaches a certain concentration, if no treatment is performed, the effect of tin stripping will be affected. The tin content in the tin stripping waste liquid reaches more than 100g / L, 20%-30% of nitric acid remains, and a small amount of polymer surfactants, polycyclic, heterocyclic and other organic substances, so it is a kind of high pollution and rich in Waste liquid with characteristics ...

Claims

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Application Information

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IPC IPC(8): C01B21/46C01F7/56C22B25/06
CPCY02P10/20
Inventor 万园园
Owner 盛隆资源再生(无锡)有限公司
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