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Method for preparing fertilizer-grade ammonium nitrate concentrated solution by use of mother liquid after immersion tin of tin-stripping waste liquid of circuit board

A technology for preparing fertilizer and ammonium nitrate solution, applied in ammonium nitrate fertilizer, nitrogen fertilizer, application and other directions, can solve the problem of incapable of resource utilization of ammonium nitrate waste liquid, and achieve the effects of low cost, large processing capacity and simple process

Active Publication Date: 2012-11-14
SHENZHEN SHENTOU ENVIRONMENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the prior art cannot effectively utilize the above-mentioned ammonium nitrate waste liquid as a resource

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] First, fill the sodium type chelating resin D403 Polyethylene plastic column, take 2000 ml of tin stripping waste liquid and filter mother liquor (pH=5.6) after sinking tin, and flow through the ion column to obtain 1952 ml of slightly yellow copper and tin removal mother liquor. Next, put the copper-tin removal mother liquor into a 5-liter glass beaker, add 200 grams of granular activated carbon, stir for 10 minutes, and then filter to dryness with a Buchner funnel to obtain 1940 milliliters of clear and transparent ammonium nitrate solution. Finally, the beaker containing the ammonium nitrate solution was heated on an electric stove, evaporated and concentrated to obtain 1270 milliliters of ammonium nitrate concentrate. The contents of the main components of the filtered mother liquor and ammonium nitrate concentrate are shown in Table 1.

[0042] The main components of the concentrated solution of nitric acid treated by the ion exchange method in table 1

[0043] ...

Embodiment 2

[0045] First, take 20 liters of the filtered mother liquor (pH=5.6) after the tin-sinking waste liquid is immersed in a 50-liter plastic bucket, start stirring, add 50 grams of aluminum chips with an Al content of 95%; add 25% ammonia water after 10 minutes to adjust Solution pH to 6.5, then add 40 milliliters of 0.1% polyacrylamide solution to improve the effect of flocculation and precipitation; then, the reactant is sucked and filtered to dryness in batches with a Buchner funnel to remove copper powder, tin powder, unreacted aluminum It is a muddy substance mixed with shavings and aluminum hydroxide. Then, the slightly yellow filtrate was transferred to the plastic bucket again, and the stirring was started, and 40 grams of powdery activated carbon was added, and after stirring for 5 minutes, suction filtration was performed in batches with a Buchner funnel to dryness to obtain 19.3 liters of clear and transparent ammonium nitrate solution. Finally, the multiple glass beake...

Embodiment 3

[0049] First, take 500 liters of the filtered mother liquor (pH=5.6) after tin-sinking waste liquid is put into an enamel reaction kettle with a volume of 1 cubic meter, start stirring, and add 3 kg of iron powder with a Fe content of 99%; after 10 minutes Add 20% ammonia water to adjust the pH of the solution to 7.0, and then add 1000 ml of 0.1% polyacrylamide solution to improve the flocculation and precipitation effect; then, filter the reactant with a filter press to remove copper powder, tin powder, and unreacted iron Powder mixed with ferrous hydroxide. Then, the slightly yellow press filtrate was transferred to the enamel reaction kettle again, and the stirring was started, and 1.2 kg of powdery activated carbon was added, and after 10 minutes, it was filtered again with a filter press to obtain 480 liters of clear and transparent ammonium nitrate solution. Finally, the ammonium nitrate solution was sent to the MVR evaporator (Mechanical Vapor Recompression) for evapora...

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PUM

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Abstract

The invention discloses a method for preparing a fertilizer-grade ammonium nitrate concentrated solution by use of the mother liquid after immersion tin of a tin-stripping waste liquid of a circuit board. The method is characterized by comprising the following successive steps of: neutralizing and precipitating the tin compound of the nitric acid type tin-stripping waste liquid by ammonia water, and removing the trace amount of copper-ammonia complex ions and organic acid stannum complex ions of the weak-acid filtering stock by a chelate ion exchange resin column in an ion exchange adsorption mode; adding powdery or granular active carbon into the processed filtering stock while stirring, wherein the added active carbon is 0.1-1% of the filtering stock by weight; and performing evaporation concentration of the ammonium nitrate solution after impurity removal according to the conventional technology, and controlling the sum of ammonium nitrogen and nitrate nitrogen to 100-200g nitrogen per liter to obtain the fertilizer-grade ammonium nitrate concentrated solution. Based on the existing ammonia water neutralizing method for processing the tin-stripping waste liquid, the invention provides a method for preparing the fertilizer-grade ammonium nitrate concentrated solution with a simple technology, large processing amount and low cost for the remaining ammonium nitrate waste liquid; and the prepared fertilizer-grade ammonium nitrate concentrated solution can be used for producing a compound fertilizer, an organic-inorganic compound fertilizer or a liquid humic acid-containing water-soluble fertilizer in a large scale.

Description

Technical field: [0001] The invention belongs to the technical field intersecting environmental protection and fertilizer production, and relates to a method for preparing ammonium nitrate concentrated liquid that meets fertilizer standard requirements by using filtered mother liquor after tin-sinking waste liquid from circuit board stripping. Background technique: [0002] Printed circuit board (PCB) is the basic component of modern electronics and information industry. my country has become the world's largest producer of printed circuit boards. Tin stripping is one of the processes in the PCB manufacturing process, and the tin stripping waste liquid is the waste produced by the tin stripping agent selectively dissolving the tin or tin-copper alloy on the copper clad layer while ensuring that the copper substrate is not corroded. liquid. Commonly used tin stripping agents are basically nitric acid type, and the nitric acid type tin stripping waste liquid is a dark green l...

Claims

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Application Information

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IPC IPC(8): C05C1/00
Inventor 王卫红米永红武建刚陈志传毛谙章
Owner SHENZHEN SHENTOU ENVIRONMENT TECH CO LTD
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