CN101658746A - Method for removing crystallization scales on plastic film filter plate of electroplating wastewater - Google Patents
Method for removing crystallization scales on plastic film filter plate of electroplating wastewater Download PDFInfo
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- CN101658746A CN101658746A CN200910192390A CN200910192390A CN101658746A CN 101658746 A CN101658746 A CN 101658746A CN 200910192390 A CN200910192390 A CN 200910192390A CN 200910192390 A CN200910192390 A CN 200910192390A CN 101658746 A CN101658746 A CN 101658746A
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- crystallization
- plastic film
- filter plate
- scales
- film filter
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Abstract
The invention relates to a method for removing crystallization scales on a plastic film filter plate of electroplating wastewater, which belongs to the field of an inorganic chemical industry technique. The invention provides the method for removing the crystallization scales on the plastic film filter plate of the electroplating wastewater, which adopts a phase conversion method to remove calciumsulfate crystallization scales step by step. The method comprises the following steps: firstly, soaking the plastic film filter plate with the crystallization scales in a saturated water solution ofa detergent A and converting the crystallization scales into crystals which have lower solubility and are easy to dissolve in the acid; then, soaking the plastic film filter plate in a water solutionof a detergent B, and dissolving the crystal and achieving the aim of removing the crystallization scales. By adopting the removing technique provided by the invention, the descaling labor strength can be lightened, the service life of the plastic film filter plate is prolonged, and the processing cost of the electroplating wastewater is lowered. The method provided by the invention is also suitable for removing other calcium sulfate crystallization scales.
Description
Technical field
A kind of method of removing crystallization scales on plastic film filter plate of electroplating wastewater belongs to the inorganic chemical technology field.
Background technology
In the electroplating wastewater processing process, add usually quick lime with in and sulfuric acid in the electroplating effluent, in order to save cost, a lot of business electrical rock ballasts replace quick limes, but after having used carbide slag, plastic film filter plate is easy to generate the crystallization dirt especially, is difficult to remove.Some enterprises adopt usually strikes the method for taking off by artificial mechanism again after the salt acid soak crystallization dirt is removed, not only labour intensity is big, and make the roughening of plastic film filter plate surface, nucleus of crystal is provided on the contrary, easier formation crystallization dirt, often plastic film filter plate must be scrapped after reusing twice or thrice.Thereby the method for seeking the removing crystallization scales on plastic film filter plate of electroplating wastewater of economical and efficient, simple and feasible seems very meaningful.
We analyze the back to this crystallization dirt chemical composition and find that its main component is a calcium sulfate.The sweep-out method of solid calcium sulphate can adopt to add intercalating agent (such as EDTA) solubilising or add highly basic calcium sulfate is converted into sour more molten the removing of calcium hydroxide, and the shortcoming of these methods is that cost is than higher.Song Yongnian report adopt the sour more molten method of sodium carbonate-hydrochloride inversion of phases remove calcium sulfate type fouling in the evaporimeter heating tube in the salt industry (Song Yongnian. brief talk the processing method of calcium sulfate type fouling in the evaporimeter heating tube. " Chinese well mine salt ", 1998, the 2nd phase, the 25-26 page or leaf).Employing soluble carbon hydrochlorates such as Xiang Lan or the sour more molten method of oxalates-hydrochloride inversion of phases are used for removing the calcium sulfate impurity of industrial potassium chloride (to orchid, open an outstanding person, Chen Zhihang, Wang Qi, Chen Kui. the calcium removing and purification method of industrial potassium chloride. Chinese invention patent. ICL: C01D 3/16. applications/patents number: 200510086474. applyings date: 20050923. open days: 20060426).It is raw material that these methods all adopt carbonate, utilizes the sour more molten principle of identical thing inversion of phases, but the objective for implementation difference, thereby technology also is not quite similar.
The place that the present invention is different with said method is: 1. selecting more cheap bicarbonate (carbonic hydroammonium, sodium acid carbonate etc.) for use is thing inversion of phases raw material; 2. objective for implementation is a crystallization scales on plastic film filter plate of electroplating wastewater.
Summary of the invention
The objective of the invention is to adopt more cheap bicarbonate is raw material, and the sour more molten method of thing inversion of phases is used to remove plastic film filter plate of electroplating wastewater crystal of calcium sulfate dirt.
The technical solution that the present invention adopts in order to achieve the above object is as follows:
At first the plastic film filter plate that is covered with the crystallization dirt is immersed in the saturated aqueous solution of detergent A, make the crystal of calcium sulfate dirt be converted into solubility lower but be soluble in acid calcium carbonate crystal; Then plastic film filter plate is immersed in the aqueous solution of detergent B, makes the calcium carbonate crystal dissolving reach the purpose of removing the crystal of calcium sulfate dirt.
Wherein detergent A is bicarbonate (carbonic hydroammonium, sodium acid carbonate etc.) or other inorganic soluble carbon hydrochlorate (ammonium carbonate, sodium carbonate etc.).
Wherein detergent B is hydrochloric acid or nitric acid.
The beneficial effect that the present invention adopts above-mentioned technical solution to reach is:
The present invention is used to remove plastic film filter plate of electroplating wastewater crystal of calcium sulfate dirt with said method, and the result has alleviated the labour intensity of artificial mechanism de-sludging, has reduced cost of labor; Prolong the service life of plastic film filter plate, saved the electroplating wastewater processing cost.
The present invention will be further described below in conjunction with embodiment.
The specific embodiment
1. the thing inversion of phases is removed crystal of calcium sulfate dirt principle
Earlier by carbonic hydroammonium with calcium sulfate (K
Sp=1.96 * 10
-4) be converted into the littler calcium carbonate (K of solubility
Sp=8.7 * 10
-9), by dissolving with hydrochloric acid calcium carbonate, reach the scale removal purpose again.
NH
4HCO
3＝NH
4 ++HCO
3 - (1)
HCO
3 -＝H
++CO
3 2- (2)
CaSO
4(s)+CO
3 2-＝CaCO
3(s)+SO
4 2- (3)
CaCO
3(s)+2HCl＝CaCl
2+H
2O+CO
2(g) (4)
2. material
Detergent A: carbonic hydroammonium (a kind of chemical fertilizer, nitrogenous greater than 17%) is made into saturated aqueous solution.
Detergent B: technical hydrochloric acid (concentration is greater than 31%) is made into concentration greater than 18% the aqueous solution.
3. place
2 in cement pond (the volume size depth is decided on handling plastic film filter plate specification and quantity).
The saturated aqueous solution of pond 1 storage detergent A.18% aqueous solution of pond 2 storage detergent B.The solution face must can flood plastic film filter plate in two ponds.
4. de-sludging implementation method
The plastic film filter plate that at first will be covered with the crystallization dirt is placed vertically and is soaked in pond 1 that (plate was at interval greater than 5cm in 3 days, down together), take out the back and with clear water the detergent A that adheres to is cleaned up, place vertically then in pond 2 and react with detergent B, reaction finishes and can see obviously that outer crystallization dirt is eliminated.Because internal layer crystallization dirt is difficult to the haptoreaction with detergent A when soaking for the first time, thereby need rinse out the detergent B that plastic film filter plate adheres to clear water, again place vertically then in the pond 1 and soaked 3 days, take out with clear water again the detergent A that adheres to is cleaned up, and then place vertically in pond 2 and react with detergent B, reaction finishes and can see that internal layer crystallization dirt also is eliminated.
Result of implementation shows that the present invention has not only alleviated the labour intensity of artificial mechanism de-sludging, has saved labor cost, has particularly prolonged the service life of plastic film filter plate, has saved material cost, thereby has reduced the electroplating wastewater processing cost.The result shows that adopting cheap bicarbonate is raw material, and it is effectively that the sour again dissolution method of thing inversion of phases is used to remove crystallization scales on plastic film filter plate of electroplating wastewater, this new discovery of the present invention especially.
Claims (3)
1. method of removing crystallization scales on plastic film filter plate of electroplating wastewater is characterized in that: described method adopts the thing phase inversion to remove crystallization scales on plastic film filter plate of electroplating wastewater step by step.At first the plastic film filter plate that is covered with the crystallization dirt is immersed in the saturated aqueous solution of detergent A, make the crystallization dirt be converted into solubility lower but be soluble in acid crystal; Then plastic film filter plate is immersed in the aqueous solution of detergent B, makes the crystal dissolving reach the purpose of removing the crystallization dirt.
2. be bicarbonate (carbonic hydroammonium, sodium acid carbonate etc.) or other inorganic soluble carbon hydrochlorate (ammonium carbonate, sodium carbonate etc.) according to the described detergent A of claim 1, it is characterized in that soluble in water and can dissociate in a step or dissociate step by step generating carbanion.
3. be hydrochloric acid or nitric acid according to the described detergent B of claim 1, it is characterized in that to react with calcium carbonate and do not generate the acid of precipitation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910192390A CN101658746A (en) | 2009-09-16 | 2009-09-16 | Method for removing crystallization scales on plastic film filter plate of electroplating wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910192390A CN101658746A (en) | 2009-09-16 | 2009-09-16 | Method for removing crystallization scales on plastic film filter plate of electroplating wastewater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101658746A true CN101658746A (en) | 2010-03-03 |
Family
ID=41787130
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910192390A Pending CN101658746A (en) | 2009-09-16 | 2009-09-16 | Method for removing crystallization scales on plastic film filter plate of electroplating wastewater |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108097050A (en) * | 2017-12-16 | 2018-06-01 | 上海东硕环保科技股份有限公司 | A kind of method for cleaning ED film calcium sulfate scales |
| CN114058073A (en) * | 2020-08-07 | 2022-02-18 | Apk股份公司 | Solvent-based recycling of drum-to-drum processing steps using a drum |
| CN114733269A (en) * | 2022-04-28 | 2022-07-12 | 龙佰集团股份有限公司 | Method for cleaning titanium gypsum filter cloth |
-
2009
- 2009-09-16 CN CN200910192390A patent/CN101658746A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108097050A (en) * | 2017-12-16 | 2018-06-01 | 上海东硕环保科技股份有限公司 | A kind of method for cleaning ED film calcium sulfate scales |
| CN114058073A (en) * | 2020-08-07 | 2022-02-18 | Apk股份公司 | Solvent-based recycling of drum-to-drum processing steps using a drum |
| CN114733269A (en) * | 2022-04-28 | 2022-07-12 | 龙佰集团股份有限公司 | Method for cleaning titanium gypsum filter cloth |
| CN114733269B (en) * | 2022-04-28 | 2024-02-06 | 龙佰集团股份有限公司 | Method for cleaning titanium gypsum filter cloth |
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Application publication date: 20100303 |