CN1096994A - The treatment process of waste nitric acid from etching zinc plate - Google Patents
The treatment process of waste nitric acid from etching zinc plate Download PDFInfo
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- CN1096994A CN1096994A CN 93112036 CN93112036A CN1096994A CN 1096994 A CN1096994 A CN 1096994A CN 93112036 CN93112036 CN 93112036 CN 93112036 A CN93112036 A CN 93112036A CN 1096994 A CN1096994 A CN 1096994A
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- nitrate
- baryta
- nitric acid
- zinc
- zinc nitrate
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Abstract
The present invention is the nitric acid waste that the rotten photo zincography in printing house is produced, and isolates organic solvent by leaving standstill, and isolates aqueous phase solution simultaneously, adds barium carbonate or hydrated barta during neutralization precipitation, adjusts pH5-6 and promptly produces precipitation nitrate of baryta and zinc nitrate mixture.Through evaporation concentration, moisture is deviate from centrifugation.Deviate from moisture through infrared drying machine drying then, the nitrate of baryta mixture that zinc nitrate that produces when obtaining by the corrosion photo zincography and adding barium carbonate or hydrated barta form.This zinc nitrate and nitrate of baryta are a kind of oxygenants, emit oxygen when meeting thermolysis, thereby play the effect of ignition dope.
Description
The present invention relates to utilize in the environment protection waste nitric acid from etching zinc plate that a kind of method of wastewater treatment is provided.
The present a large amount of rotten photo zincography waste water that produces of printing house, a kind of rotten zinc waste liquid that produces when being rare nitric acid corrosion photo zincography, its main component contains zinc nitrate, and nitric acid and anticorrosion solvent oil are owing to contain hydrogen ion 1.6-2.3 mole, zine ion 2.14 * 10 in the waste liquid
5Mg/litre and a large amount of organic solvent have caused the pollution of water system, and present treatment process adopts chemical neutralisation, the precipitator method and ion exchange method.The chemistry neutralisation is exactly with alkali or burns alkali, the nitric acid in the waste liquid is neutralized, and zinc hydroxide that produces and calcium hydroxide precipitation are removed, and ion exchange method is a kind of method that reclaims metallic zinc, but and uneconomical.The clear 55-26581 of Japanese Patent is to the zinc nitric acid waste of making a plate, at first add a kind of additive, the oil slick that separates the waste liquid surface, adjust pH value 8-10 with burning alkali then, make the precipitation of hydroxide of the zine ion generation zinc in the waste liquid, reclaim the zinc in the waste liquid, this method has only reclaimed zine ion, does not recycle the nitrate radical in the waste liquid.
The object of the present invention is to provide a kind of treatment process of waste nitric acid from etching zinc plate.Reclaim the organic solvent oil in the waste liquid, nitrate radical and zine ion are adjusted the waste liquid pH value with barium carbonate or hydrated barta, through leaving standstill, the method for neutralization precipitation, evaporation concentration, oven dry makes the mixture of zinc nitrate and nitrate of baryta, obtains the finished product ignition dope.
Method of the present invention is the rotten zinc nitric acid waste of printing house and other plate-making industries to be packed into be with in the reactor of end opening, still wall liner enamel applied corrosion resistant lining, left standstill 30 minutes, after the waste liquid layering, emit the water zinc nitrate solution from end opening, what stay is organic solvent, organic solvent is turned back to preparation to be gone in the rotten photo zincography solution, the water salpeter solution is imported in the reactor, slowly add barium carbonate or hydrated barta, constantly stir, when regulating pH value 5-6, promptly be settled out the mixture of zinc nitrate and nitrate of baryta, reaction finishes.Left standstill 30 minutes, and opened the high-temperature steam of reacting kettle jacketing, evaporate the moisture in the reaction soln of barium carbonate.The water vapor that evaporates reclaims with condensate cooler, returns after the recovery in the rotten photo zincography acid solution of preparation.When containing the zinc nitrate when rotten zinc plate-making this moment in the reaction solution and adding barium carbonate with waste liquid in the nitrate of baryta of remaining nitric acid generation, its reaction formula is:
When evaporation concentration when the pulpous state, put into whizzer, the centrifugal redundant moisture of removing, the moisture after centrifugal is reused for the rotten photo zincography acid solution of preparation.And have the zinc nitrate and the nitrate of baryta mixture of moisture, and use the remaining moisture of infrared drying machine drying again, obtain product zinc nitrate and nitrate of baryta mixture.Zinc nitrate and nitrate of baryta are a kind of oxygenants, and thermal degradation is emitted oxygen, and its reaction is as follows:
Thereby play combustion-supporting effect, commonly used to firecrackers, signal flare, on put in the product such as honeycomb briquette.
Embodiment 1:
The rotten photo zincography acid solution of certain printing house preparation wherein contains 12 kilograms in 98% nitric acid, and 3000 milliliters of organic solvents add 6000 milliliters in water, 16840 milliliters of cumulative volumes.As follows through waste liquid composition behind the corrosion photo zincography: moisture 6000 milliliters, 2.0 moles of concentration of nitric acid, 3000 milliliters of organic solvents, 10.5 kilograms of zinc nitrates, 2.4 kilograms of nitric acid contents, getting this waste liquid packs in the protection against corrosion reactor of being with end opening, left standstill 30 minutes, and emitted 13840 milliliters of aqueous phase solutions, directly reclaim 3200 milliliters of water-containing organic solvents, then with the water zinc nitrate solution, put into reactor, slowly add barium carbonate, constantly stir, when recording PH5-6, promptly get the mixture of zinc nitrate and nitrate of baryta, reaction finishes, and opens the chuck high-temperature steam, the evaporation concentration aqueous phase solution, the water vapor that evaporates reclaims through condensate cooler, returns in the rotten photo zincography acid solution of preparation, when it is concentrated to pulpous state, put into whizzer, the moisture that centrifugation goes out returns in the rotten photo zincography acid solution of preparation.Separate to obtain being with water zinc nitrate and nitrate of baryta mixture, behind infrared drying machine drying moisture, obtain the mixture of 14.8 kilograms of exsiccant solid nitric acid zinc and nitrate of baryta, make firecrackers with preparation, signal flare, on use when putting honeycomb briquette.
Embodiment 2:
Same the above embodiments adopt hydrated barta to replace barium carbonate to obtain same effect.
Claims (2)
1, a kind of treatment process of rotten photo zincography waste liquid is characterized in that process leaves standstill, neutralization precipitation, and evaporation concentration, the method for oven dry make zinc nitrate and nitrate of baryta mixture.
2, the treatment process of the rotten photo zincography waste liquid of narrating according to claim 1 during neutralization precipitation, slowly adds barium carbonate or hydrated barta, constantly stir, when adjusting pH value 5-6 zinc nitrate and nitrate of baryta mixture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93112036 CN1096994A (en) | 1993-06-28 | 1993-06-28 | The treatment process of waste nitric acid from etching zinc plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93112036 CN1096994A (en) | 1993-06-28 | 1993-06-28 | The treatment process of waste nitric acid from etching zinc plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1096994A true CN1096994A (en) | 1995-01-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93112036 Pending CN1096994A (en) | 1993-06-28 | 1993-06-28 | The treatment process of waste nitric acid from etching zinc plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1096994A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105731519A (en) * | 2014-12-08 | 2016-07-06 | 中国石油天然气股份有限公司 | Preparation method and device of zinc nitrate solution |
| US11708203B2 (en) | 2017-10-26 | 2023-07-25 | Conopco, Inc. | Product packaging |
-
1993
- 1993-06-28 CN CN 93112036 patent/CN1096994A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105731519A (en) * | 2014-12-08 | 2016-07-06 | 中国石油天然气股份有限公司 | Preparation method and device of zinc nitrate solution |
| US11708203B2 (en) | 2017-10-26 | 2023-07-25 | Conopco, Inc. | Product packaging |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |