CN1116125C - Fixing method for stainless steel dust-collector - Google Patents
Fixing method for stainless steel dust-collector Download PDFInfo
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- CN1116125C CN1116125C CN 00120338 CN00120338A CN1116125C CN 1116125 C CN1116125 C CN 1116125C CN 00120338 CN00120338 CN 00120338 CN 00120338 A CN00120338 A CN 00120338A CN 1116125 C CN1116125 C CN 1116125C
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- collector
- dust
- stainless steel
- stabilization
- steel dust
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Abstract
The present invention relates to a method for fixing dust collected by stainless steel, which mainly orderly comprises a reduction step, a stabilization step and a solidification step. The method comprises: thiosulfate anion ionized water solution is added to the dust collected by stainless steel, so that hexavalent chromium is reduced to trivalent chromium; then, ferrous ions are added to the mixture, so that the ferrous ions and the trivalent chromium are combined into a spinel structure, and the dust is stabilized; finally, cement is used for carrying out solidification treatment to the dust, so that heavy metal is limited in the solidification body, and therefore, the dissolution of harmful heavy metal can be prevented; after fixing treatment is carried out to the dust collected by stainless steel which originally belongs to hazardous waste, the dust is converted into waste which conforms to the general waste standard in environmental protection regulations.
Description
The present invention relates to a kind of process for fixation of stainless steel dust-collector, particularly relate to a kind of discarded object with the nuisance cause through solidify handle after, be transformed into the process for fixation of the stainless steel dust-collector of harmless discarded object.
Because of the raising of quality of the life in recent years, so, many article all adopt have anticorrosive, the stainless steel of high temperature resistant and attractive in appearance advantage such as not easy to change is a material, and stainless steel is to add chromium (Cr) content in the steel alloy to have corrosion resistance above 11.5%, so must add high-chromium alloy iron in its refining process, contain a large amount of chromium in the dust-collector that is produced when making the refining stainless steel, this dust-collector is to belong to harmful cause discarded object, and stainless steel dust-collector ranges the reason of bazardous waste, shown in following subordinate list 1, mainly be Cr VI (Cr in its toxicity dissolution test (being called for short TCLP)
6+) and total chromium concn exceed the standard of environmental regulation.Other dust-collectors as carbon steel also belong to bazardous waste, and concentration of heavy metal ion such as contained lead, zinc, cadmium records the standard that exceeds environmental regulation in its dust-collector in the toxicity dissolution test.
Subordinate list 1 is electric furnace and the toxicity stripping test result of converter dust-collector after cement solidification.
Unit: PPM
| Classification | Mercury | Arsenic | Plumbous | Cadmium | Copper | Zinc | Cr VI | Total chromium |
| The electric furnace dust-collector | 0.097 | 0.0012 | 0.68 | 0.044 | ＜0.05 | 0.18 | 24.5 | 25.3 |
| The converter dust-collector | ＜0.001 | 0.0027 | 0.42 | 0.1 | 0.09 | 0.76 | 5.29 | 5.72 |
| The standard dust-collector | 0.2 | 5.0 | 5.0 | 1.0 | 15 | 25 | 2.5 | 5.0 |
Present stainless steel control of dust treatment technology, except solidification method, electricity is starched stove fusion recovery in addition, direct granulation is melted down and ferromagnet stabilization method, and should starch the processing cost height that the stove fusion is reclaimed, direct granulation is melted down by electricity.Ferromagnet stabilization method, as the stabilization method of stainless steel converter dust, it reduces the stabilization method of wherein harmful metal ion stripping by multiple coating flue dust, the stabilization method of its stainless steel converter dust includes a. the stainless steel converter dust be impregnated in the water; B. in the maceration extract of step a., add divalent iron salt, and in aeration, pH value between 11 to 13 and temperature between the reaction 0.5 to 2 hour down of 40 to 80 degree, and form the sediment that is coated with Ferrite; C. filter to isolate the sediment of step b.; The stabilization of flue dust more comprises inserts the spherical reactor (two liters of capacity) of four-hole that the Ferrite makeup is put with flue dust, add an amount of clear water and NaOH again, again this reactor is inserted in the heat packs and heat, stir by squeezing into the 4L/min air in this air compressor simultaneously, to temperature rise to temperature required after, add an amount of ferrous salt solution, continue aeration and make it finish the Ferrite coating, the formation of this Ferrite is by the crystalline texture of Ferrite and natural spinelle (MgAl
2O
4) cubic system of type is identical, Mg wherein
2+Can be other metal ions (M
2+) replace, and Al
3+Can be Fe
3+Or other trivalent ion replacement, be M and form molecular formula
2+M
2 3+O
4 2-Ferrite spinel-type structure, generally enter the metallic element of spinel-type Ferrite, almost contained all metal species commonly used.If in the formed spinel ferrite magnet, if the M of divalence
2+Ion enters octahedral interstices in the crystal structure, and the M of trivalent
3+Half enters octahedral interstices ion, and half enters the tetrahedron space, then forms so-called contrary spinel structure Ferrite, and it has the soft matter of magnetic; The operation of the stabilization method of this kind stainless steel converter dust is not only complicated and be not inconsistent economic benefit.
Some manufacturer is for easy and simple to handle and reduction equipment investment cost, and it is main mostly adopting solidification method, and solidification method is handled at present, is the solidification method that carbon steel mixes with stainless steel dust-collector is handled, and there is no independent technology with the processing of stainless steel dust-collector solidification method.
The object of the invention is to provide a kind of dust-collector process for fixation, can handle stainless steel dust-collector separately, bazardous waste is transformed into the process for fixation of the stainless steel dust-collector of harmless discarded object.
The process for fixation of stainless steel dust-collector of the present invention, it is characterized in that: in stainless steel dust-collector, add the thiosulfate ion aqueous solution, make hexavalent chrome reduction become trivalent chromium, afterwards, add ferrous ion again and trivalent chromium is combined into spinel structure, make its stabilization, at last, and utilize cement to be solidified processing, and heavy metal is limited in the firming body, make the present invention can prevent the stripping of harmful heavy metal, and belong to the stainless steel dust-collector of bazardous waste originally, after solidifying processing, be transformed into the standard that meets the general discarded object of environmental regulation.
The curing of stainless steel dust-collector of the present invention, it comprises a reduction step in regular turn, stabilization step and curing schedule, in this reduction step, be evenly to stir with adding the thiosulfate ion aqueous solution in the stainless steel dust-collector, make the hexavalent chrome reduction in the stainless steel dust-collector become trivalent chromium, then, in this stabilization step, be with after this reduction step, add again and stir behind the ferrous ion aqueous solution and it is mixed, so that the trivalent chromium that is reduced into gives stabilization, at last, in this curing schedule, the trivalent chromium and even stirring of cement of stabilization are solidified, and made the stainless steel dust-collector of bazardous waste originally, the reduction through adding the thiosulfate ion aqueous solution and the stabilization of the ferrous ion aqueous solution, utilize the curing of cement again, meet general discarded object, and can effectively reach the effect that operation is convenient and reduce cost and be transformed into.
The present invention is described in detail below in conjunction with drawings and Examples:
Fig. 1 is the block flow diagram of preferred embodiment of the present invention.
As shown in Figure 1, the process for fixation of the stainless steel dust-collector of present embodiment mainly is to comprise a reduction step 1, a stabilization step 2 and a curing schedule 3 in regular turn.
This reduction step 1 is evenly to stir adding the thiosulfate ion aqueous solution in the stainless steel dust-collector, makes that the hexavalent chrome reduction in the stainless steel dust-collector becomes trivalent chromium.This stabilization step 2 is with after the reduction step, adds the ferrous ion aqueous solution again, so that the trivalent chromium that is reduced into gives stabilization.This curing schedule 3 is solidified the trivalent chromium of stabilization and even stirring of cement.
The present invention can make an experimental example earlier according to above steps, and the experimental result of its gained is as follows:
1 reduction experiment:
Because stainless steel dust-collector adds the thiosulfate ion aqueous solution under the environment of alkalescence, can be with Cr VI (Cr in the dust-collector
6+) be reduced into trivalent chromium (Cr
3+) its reaction equation as:
Therefore, 2000 g stainless steel dust-collector is got in this experiment, and with the dust-collector and the thiosulfate ion aqueous solution 100: 1 ratio, make an addition to 20 g the thiosulfate ion aqueous solution (this experimental example is to adopt sodium thiosulfate solution) in this dust-collector and mixed, like this contained most reducible one-tenth trivalent chromium of Cr VI in the dust-collector, and these hexavalent chromium concentration data are reduced to 1.2PPM, the 2.5PPM that has been lower than environmental regulation is below the mark, and total chromium mainly is with trivalent chromium (Cr
3+) the form existence, so total chromium concn still exceeds more than the dissolution test standard 5.0PPM, shown in the and for example following subordinate list 2, when gaining in weight when the ratio that more improves the thiosulfate ion aqueous solution, its toxicity dissolution test (TCLP) test result, it is lower that chromic concentration is reduced to, and hence one can see that, as long as the dust-collector and the thiosulfate ion aqueous solution are 100: 1 above ratios, all hexavalent chromium concentration can be reduced under the environmental regulation standard.
Subordinate list 2 is the toxicity stripping test results that add the Different Weight thiosulfate ion.
Unit: PPM
| Numbering | Thiosulfate ion (g) | Cr VI (PPM) | Total chromium (PPM) |
| A | 0 | 13.05 | 15 |
| B | 20 | 1.2 | 10.8 |
| C | 100 | 0.009 | 5.8 |
| D | 200 | 0.003 | 8 |
The experiment of 2 stabilizations:
Stainless steel dust-collector after reduction experiment, its chromium in the environment of alkalescence with chromium hydroxide Cr (OH)
3Form exists, and in order to quicken its settling rate and stability, so add the ferrous ion aqueous solution, utilizes ferrous ion (Fe
2+) aqueous solution and chromium hydroxide reaction, to form stable spinel structure, its reaction equation is as follows:
In order to reduce the total chromium concn after reduction is tested, this experiment dust-collector and the ferrous ion aqueous solution are 100: 1 above ratios, the ferrous ion aqueous solution (present embodiment is adopted ferrous sulfate) with 60 g (are to be 100: 3 ratio with the dust-collector and the ferrous ion aqueous solution with regard to this experiment), make an addition in the dust-collector after the reduction experiment and mixed, so, trivalent chromium contained in this dust-collector gives stabilization, make its total chromium concn be reduced to 1.36PPM and to meet environmental regulation 5.0PPM below the mark, shown in subordinate list 3, the ferrous ion aqueous solution has the effect of stabilization to trivalent chromium.
Subordinate list 3 is the toxicity stripping test results that add ferrous ion.
Unit: PPM
| Numbering | Thiosulfate ion (g) | Ferrous radical ion (g) | Cr VI (PPM) | Total chromium (PPM) |
| E | 20 | 60 | ＜1.36 | 1.36 |
| F | 50 | 60 | 0.009 | 1.38 |
| G | 75 | 60 | 0.012 | 1.18 |
3 cure test:
Via the stainless steel dust-collector after the stabilization experiment, and be 15: 100 ratio, add cement and can form space network that the heavy metal casket in the stainless steel dust-collector is limited in the firming body, and therefore, this heavy metal is difficult by acid stripping with cement and dust-collector.
All ripe by above-mentioned breadboard operation experiments; next just can do the scale test; 300 liters water and 7.5kg thiosulfate ion are mixed into the thiosulfate ion aqueous solution; it will mix with the thiosulfate ion aqueous solution in the 750kg stainless steel dust-collector; make the hexavalent chrome reduction in the stainless steel dust-collector become trivalent chromium; after then adding 75 liters water and 22.5kg ferrous ion again and being mixed into the aqueous solution of ferrous ion; through stirring and it being mixed; so that the trivalent chromium that is reduced into gives stabilization; at last; the even stirring of 225kg cement solidified; shown in subordinate list 4; Cr VI is 0.004PPM; and that total chromium is that 1.75PPM all meets environmental regulation is below the mark; the scale operation; heavy metal dissolution test in its all stainless steel dust-collectors all meets environmental protection standard; make that the present invention can be with the reduction of harmful stainless steel dust-collector via the thiosulfate ion aqueous solution; the stabilization of the ferrous ion aqueous solution and utilize cement solidification after, convert the general discarded object that meets toxicity dissolution test (TCLP) to.
Subordinate list 4 is toxicity stripping test results of scale test.
Unit: PPM
| Numbering | Total copper | Total cadmium | Total zinc | Total plumbous | Cr VI | Total chromium |
| L | 0.048 | 0.029 | 0.063 | 0.371 | 0.004 | 1.75 |
Learn from the above mentioned, the present invention can stir the stainless steel dust-collector via adding the thiosulfate ion aqueous solution, make its hexavalent chrome reduction become trivalent chromium, add the aqueous solution of ferrous ion again, and make trivalent chromium become stabilization, last, utilize cement that dust-collector is solidified, so as to the operation process of reduction, stabilization and cement solidification, just can convert harmful stainless steel dust-collector discarded object to harmless general discarded object, and really can reach the convenient and effect that reduces cost of operation.
Claims (6)
1. the process for fixation of a stainless steel dust-collector, it is characterized in that: it mainly includes reduction step, stabilization step and curing schedule in regular turn;
This reduction step is evenly to stir adding the thiosulfate ion aqueous solution in the stainless steel dust-collector, makes that the hexavalent chrome reduction in the stainless steel dust-collector becomes trivalent chromium;
This stabilization step is after this reduction step, adds the ferrous ion aqueous solution again and is also mixed, so that the trivalent chromium that is reduced into gives stabilization;
This curing schedule is solidified the trivalent chromium of stabilization and even stirring of cement.
2. the process for fixation of stainless steel dust-collector as claimed in claim 1, it is characterized in that: the ratio of thiosulfate ion and dust-collector was at least 1: 100 in this reduction step.
3. the process for fixation of stainless steel dust-collector as claimed in claim 1, it is characterized in that: the ratio of ferrous ion and dust-collector was at least 1: 100 in this stabilization step.
4. the process for fixation of stainless steel dust-collector as claimed in claim 1, it is characterized in that: the ratio of cement and dust-collector was at least 15: 100 in this curing schedule.
5. the process for fixation of stainless steel dust-collector as claimed in claim 1, it is characterized in that: this thiosulfate ion is a sodium thiosulfate.
6. the process for fixation of stainless steel dust-collector as claimed in claim 1, it is characterized in that: this ferrous ion is a ferrous sulfate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00120338 CN1116125C (en) | 2000-07-07 | 2000-07-07 | Fixing method for stainless steel dust-collector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00120338 CN1116125C (en) | 2000-07-07 | 2000-07-07 | Fixing method for stainless steel dust-collector |
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| CN1333091A CN1333091A (en) | 2002-01-30 |
| CN1116125C true CN1116125C (en) | 2003-07-30 |
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| CN 00120338 Expired - Fee Related CN1116125C (en) | 2000-07-07 | 2000-07-07 | Fixing method for stainless steel dust-collector |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20100057100A (en) * | 2005-10-28 | 2010-05-28 | 고마쓰 산기 가부시키가이샤 | Method of fume treatment and apparatus therefor |
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Application publication date: 20020130 Assignee: Angang Lianzhong (Guangzhou) Stainless Steel Co., Ltd. Assignor: Yelian Inst & Steel Co., Ltd. Contract record no.: 2015990000178 Denomination of invention: Fixing method for stainless steel dust-collector Granted publication date: 20030730 License type: Common License Record date: 20150409 |
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