CN101066826A - Phosphate stabilizing treatment process for electroplating sludge - Google Patents
Phosphate stabilizing treatment process for electroplating sludge Download PDFInfo
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- CN101066826A CN101066826A CN 200710041574 CN200710041574A CN101066826A CN 101066826 A CN101066826 A CN 101066826A CN 200710041574 CN200710041574 CN 200710041574 CN 200710041574 A CN200710041574 A CN 200710041574A CN 101066826 A CN101066826 A CN 101066826A
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- electroplating sludge
- phosphate
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Abstract
The present invention relates to phosphate stabilizing treatment process for electroplating sludge, and belongs to the field of environment engineering technology. The process includes the following steps: 1. stoving electroplating sludge at 102 deg.c and grinding into powder; 2. mixing analytic pure soluble phosphate and the sludge powder in the weight ratio of 1 to 70-90 at 30-70 deg.c, and stirring powerfully for 4 hr for reaction while controlling the pH value in 8-11; and 3. cooling naturally after reaction to obtain solid sludge with combined heavy metal and phosphate. Thus treated electroplating sludge, EPA toxicity leaching test shows, can reach dangerous waste landfill standard.
Description
Technical field
The present invention relates to a kind of phosphate stabilizing treatment process of electroplating sludge, belong to field of environment engineering technology.
Background technology
Electroplating industry is produced and is produced a large amount of electroplating wastewaters, electroplating wastewater generally adopts methods such as acid-base neutralisation, flocculation sediment to handle at present, thereby can produce a large amount of electroplating sludges, electroplating sludge must be disposed through the stable curing pre-treatment of safety just can finally enter the landfill yard landfill.The most effective at present stable curing pretreatment process is cement solidification, makes it to mix with mud by adding a certain proportion of cement, and reaction under certain conditions can be with the heavy metal stable curing among its lattice.The method of cement solidification can prevent the stripping of heavy metal effectively, though realized the harmless treatment of electroplating sludge, also can cause higher increase-volume ratio.Simultaneously, the electroplating sludge cured body after cement or the lime stabilizationization still has high heavy metal contaminants to leach under acidic conditions.Therefore, handle the space and be tending towards saturated, must seek a kind of innoxious pretreatment process of safety and stability of new electroplating sludge along with electroplating sludge produces the increase of total amount and landfill yard.
Phosphate mineral is just receiving the concern of more and more scholars as a kind of novel environment mineral material.Numerous studies have shown that at present, phosphatic rock family phosphate mineral has very high geochemistry stability, and heavy metal is had good stable curing effect.
Summary of the invention
The phosphate stabilizing treatment process that the purpose of this invention is to provide a kind of electroplating sludge.
Characteristics of the present invention are to add a certain amount of soluble phosphate in electroplating sludge, and reaction under certain conditions, realize that by the method that forms phosphatic rock family heavy metal phosphate mineral the safety and stability of electroplating sludge is solidified pre-treatment.
The present invention is a kind of phosphate stabilizing treatment process of electroplating sludge, it is characterized in that having following process and step:
A. with electroplating sludge through 102 ℃ of oven dry, pulverize then, standby;
B. under 30 ~ 70 ℃ of temperature ranges, analytically pure soluble phosphate is mixed with the part by weight of above-mentioned electroplating sludge by 1: 70 ~ 1: 90, and brute force stirred 4 hours in stirrer, and it is fully reacted; Carry out the control of pH value in the reaction process with the NaOH solution of 1mol/L, the scope of pH value is controlled to be 8-11;
C. after reaction finished, naturally cooling obtained containing the sewage sludge solid sample of heavy metal composite phosphate; Then this sample is made the EPA toxicity characteristic leaching procedure, the leaching toxicity of heavy metal in the working sample; Test shows that this mud can reach the Hazardous wastes standard of landfill of national regulation.
Dominant mechanism of the present invention is as described below:
The present invention utilizes the calcium ion that exists in the electroplating sludge and the characteristics of heavy metal ion, adds soluble phosphate in electroplating sludge, by physics chemical action, and by certain pH condition control, shifts the heavy metal Pb that contains in the electroplating sludge
2+, Cd
2+Plasma forms and mixes the calcium phosphate that heavy metal ion is arranged, and also promptly forms the composite structure compound of phosphatic rock family heavy metal phosphate mineral phase, thereby makes heavy metal ion reach the solidification and stabilization effect therein.
Heavy metal in the mud after the stabilization can keep satisfactory stability in the pH of broad scope; Electroplating sludge after stable simultaneously not only has good thermostability, also have lower increase-volume ratio, thereby it is effectively innoxious that electroplating sludge is obtained, the stabilization pre-treatment.
Embodiment
After now embodiments of the invention specifically being described in.
Embodiment 1
The treating processes and the step of present embodiment are as follows:
(1). will take from the electroplating sludge at the useless center of danger, Shanghai City, behind fine laundering, under 102 ℃ of temperature, dry earlier, pulverize then, standby;
(2). under 60 ℃ of temperature,, be mixed with the solution that concentration is 0.25mol/L with analytically pure soluble phosphoric acid sodium; Described sodium phosphate is mixed with the part by weight of described electroplating sludge powder by 1: 80, and brute force stirred 4 hours in stirrer, and it is fully reacted; Carry out the control of pH value in the reaction process with the NaOH solution of 1mol/L, the scope of pH value is controlled to be 9-10;
(3). after reaction finished, naturally cooling obtained containing heavy metal Pb
2+, Cd
2+Sewage sludge solid sample Deng composite phosphate; Then this sample is made the EPA toxicity characteristic leaching procedure, heavy metal Pb in the working sample
2+, Cd
2+Deng leaching toxicity; Test shows that described mud can reach the Hazardous wastes standard of landfill of national regulation.
EPA toxicity characteristic leaching procedure step is as follows:
(1). at first press U.S. EPA toxicity characteristic leaching procedure method preparation leaching medium; The leaching medium is made into by HAC solution, and its pH value is 2.88;
(2). with the above-mentioned heavy metal Pb that contains
2+, Cd
2+After the oven dry of the sewage sludge solid sample of composite phosphate, be that 2.88 leaching medium leaches with above-mentioned pH value; The sewage sludge solid sample is 1: 20 with the weightmeasurement ratio of leaching medium liquid in test, the sewage sludge solid sample ligand that is per 1 gram is with 20 milliliters leaching medium liquid, the drum turning rotating speed of this testing apparatus is 30 rev/mins, and be 18 hours flip-flop transition, and test temperature is 22 ℃;
(3). use the cellulose acetate filtering with microporous membrane of diameter 0.45 μ m then, filtrate is positioned in 4 ℃ the refrigerator to be measured;
(4). with the above-mentioned Pb that contains
2+, Cd
2+Filtrate etc. heavy metal ion is measured its concentration with the straight inductively coupled plasma emission spectrometer of the full spectrum of detecting instrument Prodigy; Measurement result, Pb
2+, Cd
2+Concentration be respectively 0.0311mg/L and 0.0430mg/L.
Pb in the electroplating sludge is described this moment
2+, Cd
2+Concentration reached the national regulation requirement of Hazardous wastes landfill admission control limit value 5mg/L and 0.5mg/L (GB18598-2001).
Claims (1)
1. the phosphate stabilizing treatment process of an electroplating sludge is characterized in that having following process and step:
A. with electroplating sludge through 102 ℃ of oven dry, pulverize then, standby;
B. under 30 ~ 70 ℃ of temperature ranges, analytically pure soluble phosphate is mixed with the part by weight of above-mentioned electroplating sludge by 1: 70 ~ 1: 90, and brute force stirred 4 hours in stirrer, and it is fully reacted; Carry out the control of pH value in the reaction process with the NaOH solution of 1mol/L, the scope of pH value is controlled to be 8-11;
C. after reaction finished, naturally cooling obtained containing the sewage sludge solid sample of heavy metal composite phosphate; Then this sample is made the EPA toxicity characteristic leaching procedure, the leaching toxicity of heavy metal in the working sample; Test shows that this mud can reach the Hazardous wastes standard of landfill of national regulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100415743A CN100491277C (en) | 2007-06-01 | 2007-06-01 | Phosphate stabilizing treatment process for electroplating sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100415743A CN100491277C (en) | 2007-06-01 | 2007-06-01 | Phosphate stabilizing treatment process for electroplating sludge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101066826A true CN101066826A (en) | 2007-11-07 |
| CN100491277C CN100491277C (en) | 2009-05-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100415743A Expired - Fee Related CN100491277C (en) | 2007-06-01 | 2007-06-01 | Phosphate stabilizing treatment process for electroplating sludge |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102514079A (en) * | 2011-11-25 | 2012-06-27 | 盐城工学院 | Treatment method capable of achieving stabilization and curing of electroplating sludge |
| CN104445469A (en) * | 2014-12-18 | 2015-03-25 | 石泰山 | Method for treating phosphorus/phosphine-containing electroplating wastewater by utilizing electroplating sludge |
| CN106636651A (en) * | 2016-12-16 | 2017-05-10 | 江苏理工学院 | Method for separating chromium from iron and aluminum in sulfuric acid system solution containing chromium, iron and aluminum |
| CN107673529A (en) * | 2017-09-27 | 2018-02-09 | 新中天环保股份有限公司 | A kind of phosphate glass solidification technique |
-
2007
- 2007-06-01 CN CNB2007100415743A patent/CN100491277C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102514079A (en) * | 2011-11-25 | 2012-06-27 | 盐城工学院 | Treatment method capable of achieving stabilization and curing of electroplating sludge |
| CN104445469A (en) * | 2014-12-18 | 2015-03-25 | 石泰山 | Method for treating phosphorus/phosphine-containing electroplating wastewater by utilizing electroplating sludge |
| CN106636651A (en) * | 2016-12-16 | 2017-05-10 | 江苏理工学院 | Method for separating chromium from iron and aluminum in sulfuric acid system solution containing chromium, iron and aluminum |
| CN106636651B (en) * | 2016-12-16 | 2018-05-08 | 江苏理工学院 | The separation method of chromium and iron aluminium in a kind of sulfuric acid system solution of aluminium containing ferrochrome |
| CN107673529A (en) * | 2017-09-27 | 2018-02-09 | 新中天环保股份有限公司 | A kind of phosphate glass solidification technique |
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| Publication number | Publication date |
|---|---|
| CN100491277C (en) | 2009-05-27 |
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Granted publication date: 20090527 Termination date: 20120601 |