CN102432040A - Method for treating fly ash of chromic salt rotary kiln - Google Patents
Method for treating fly ash of chromic salt rotary kiln Download PDFInfo
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- CN102432040A CN102432040A CN2011102674382A CN201110267438A CN102432040A CN 102432040 A CN102432040 A CN 102432040A CN 2011102674382 A CN2011102674382 A CN 2011102674382A CN 201110267438 A CN201110267438 A CN 201110267438A CN 102432040 A CN102432040 A CN 102432040A
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- flying dust
- rotary kiln
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- filtrating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention relates to a method for treating fly ash of a chromic salt rotary kiln. The method comprises the steps of: 1) subjecting fly ash to slurrying, filtering and washing so as to obtain soda ash and a sodium chromate solution; 2) conducting pressurized carbonization to the soda ash and the sodium chromate solution, then carrying out filtering so as to obtain a sodium bicarbonate sediment and a sodium chromate filtering solution; 3) filtering the obtained sodium bicarbonate sediment and drying it, then returning the sediment to the chromic salt rotary kiln for batching, and leaving the obtained sodium chromate filtering solution to flow into a sodium dichromate production line. The method of the invention can fully recover useful components (soda ash, chromite and sodium chromate) in the fly ash of a chromic salt rotary kiln, and realize comprehensive utilization of fly ash.
Description
Technical field
The invention belongs to the chromic salts field, relate in particular to a kind of comprehensive processing method of chromic salts rotary kiln flue gas regenerant flying dust.
Background technology
Chromic salts rotary kiln batching is made up of chromite, soda ash, return slag; In rotary kiln coal dust firing heat-processed; Produce volume of smoke, filter, produce and account for the prepare burden flying dust of 7w%～8w% of total charging capacity of rotary kiln through sack cleaner; Through the flue that bag-type dusting is discharged, its gas concentration lwevel is between 8%v/v～12%v/v.The main composition of flying dust has reacted sodium chromate chamotte and coal-fired ash composition by unreacted soda ash, return slag, chromite, part.Sodium chromate-51Cr in the flying dust is between 1.6w%～4.3w%, and soda ash is between 17.5w%～21.5w%, and chromium sesquioxide is at 17.5w%～18.5w%.
Summary of the invention
The purpose of this invention is to provide a kind of chromic salts rotary kiln flying dust improvement method.
The present invention includes following extraction soda ash step:
Flying dust that A, chromic salts rotary kiln are collected and water are pressed mass ratio 1:1～2 batching pulping and washing flying dusts, are heated to 70～85 ℃, stir 1～2 hour, and Plate Filtration washs to such an extent that lower concentration is filtrated, and the gained filter cake is used to smelt chromium cast iron contained; Lower concentration filtrating and flying dust are heated to 70～85 ℃ by mass ratio 1～2:1 pulping and washing flying dust once more of preparing burden, and stir 1～2 hour, and Plate Filtration washs to such an extent that high density is filtrated, and the gained filter cake is used to smelt chromium cast iron contained.
The chemical ingredients of untreated flying dust is following:
| Project | Na 2CrO 4 | Na 2CO 3 | Cr 2O 3 | Fe 2O 3 | Al 2O 3 | SiO 2 | CaO | MgO |
| Flying dust w/% | 1.6～4 | 12～14 | 14～16 | 20～22 | 8～10 | 6～8 | 2～3 | 12～14 |
Flying dust slag ingredient after the washing is following:
| Project | Na 2CrO 4 | Na 2CO 3 | Cr 2O 3 | Fe 2O 3 | Al 2O 3 | SiO 2 | CaO | MgO | Moisture content |
| Flying dust slag w/% | 0～0.2 | 2～3 | 17 ～19 | 25～27 | 12～15 | 7～9 | 2.5～3.5 | 13～15 | 21～24 |
Flying dust wash heat is smelted in electric arc furnace with silica, coke after washing airing, can get chromium cast iron contained.
B: pressurization carbonization
A step gained high density filtrating is squeezed into the sieve-board type carbonating tower, the carbonic acid gas flue gas of chromic salts rotary kiln after sack cleaner purifies is forced into 0.01～0.5MPa, feed the sieve-board type carbonating tower, carbonization 5～12 hours;
C: centrifuging
With B step carbonization gained slurries, separate through whizzer, obtain the sodium bicarbonate solid particle, after 140～300 ℃ of oven dry, process soda ash through hotblast stove, return chromic salts rotary kiln soda ash batching storehouse.
As further improvement of the present invention; It also comprises reclaims Sodium chromate-51Cr filtrating step: said C step whizzer is filtered gained Sodium chromate-51Cr filtrating (the main Sodium chromate-51Cr that contains); Being neutralized to PH through sulfuric acid is 5.5～6.8, and the production line that gets into industrial sodium dichromate 99 reclaims Sodium chromate-51Cr.
Beneficial effect of the present invention is the flying dust that the chromic salts rotary kiln is discharged is made full use of, soda ash and Sodium chromate-51Cr in the not only recyclable chromic salts rotary kiln flying dust, and also gained flying dust slag can be used for the smelting of chromium cast iron contained.The present invention cleans chromic salts and produces significantly, is beneficial to environmental protection.
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
Embodiment
Following embodiment can further specify the present invention, but does not limit the present invention in any way.
Embodiment 1 extracts soda ash
1, pulping and washing
18 tons of flying dusts slowly are added in 18 tons of flying dust wash heat water, are heated to 70 ℃, stirred 1 hour, the Plate Filtration washing, gained flying dust slag (1) is used to smelt chromium cast iron contained; Gained lower concentration filtrating 11.5m3 continues 12 tons of flying dusts of pulp, is heated to 70 ℃, stirred 1 hour, and the Plate Filtration washing, gained high density filtrating pressurization carbonization, filtrate main carbonated sodium and Sodium chromate-51Cr, flying dust slag (2) is used to smelt chromium cast iron contained;
Flying dust and flying dust slag ingredient see the following form
| Project | Na 2CrO 4 | Na 2CO 3 | Cr 2O 3 | Fe 2O 3 | Al 2O 3 | SiO 2 | CaO | MgO | Moisture content |
| Flying dust (%) | 1.6 | 13.01 | 14.23 | 22.87 | 8.742 | 6.753 | 2.06 | 12.15 | 0 |
| Flying dust slag (1) (%) | 0 | 2.03 | 17.22 | 25.63 | 12.03 | 8.855 | 2.53 | 13.11 | 21 |
| Flying dust slag (2) (%) | 0.02 | 2.92 | 17.53 | 25.24 | 12.05 | 8.423 | 2.56 | 13.20 | 21.5 |
2, pressurization carbonization
Gained high density filtrating (main soda ash and the Sodium chromate-51Cr of containing) is squeezed into 10m3 sieve-board type carbonating tower, and the 8%v/v carbonic acid gas flue gas of chromic salts rotary kiln after the bag udst separation is forced into 0.01MPa with the Roots blower fan, feeds carbonating tower, carbonization 12 hours;
3, centrifuging
Gained sodium hydrogencarbonate and Sodium chromate-51Cr slurries filter through S-1000 whizzer (liner 750 polyvinyl filter clothes), and gained sodium bicarbonate solid particle after 300 ℃ of oven dry, makes soda ash through hotblast stove, directly returns the chromic salts rotary kiln and joins the alkali storehouse.
Embodiment 2 reclaims Sodium chromate-51Cr filtrating
With the Sodium chromate-51Cr of embodiment 1 gained 7m3 filtrating, be neutralized to PH through the vitriol oil and 5.5 boil and obtained chromium acid sodium solution in 1 hour and get into the sodium dichromate 99 production line.
Embodiment 3
1, pulping and washing
8 tons of flying dusts slowly are added in 16 tons of flying dust wash heat water, are heated to 85 ℃, stirred 2 hours, the Plate Filtration washing, gained flying dust slag (1) is used to smelt chromium cast iron contained; Gained 10m3 lower concentration filtrating is squeezed into flying dust pulp pond; Under whipped state, evenly add 5 tons of flying dusts, be heated to 85 ℃, stirred 2 hours; Plate Filtration washing, gained high density filtrating pressurization carbonization, high density filtrate main carbonated sodium and Sodium chromate-51Cr, flying dust slag (2) is used for the smelting of chromium cast iron contained;
Flying dust and flying dust slag ingredient see the following form
| Project | Na 2CrO 4 | Na 2CO 3 | Cr 2O 3 | Fe 2O 3 | Al 2O 3 | SiO 2 | CaO | MgO | Moisture content |
| Flying dust (%) | 4 | 13.98 | 15.96 | 21.96 | 9.92 | 7.93 | 2.92 | 12.05 | 0 |
| Flying dust slag (1) (%) | 0.018 | 2.98 | 18.87 | 26.63 | 12.93 | 8.95 | 3.5 | 14.92 | 23 |
| Flying dust slag (2) (%) | 0.019 | 2.79 | 18.97 | 26.96 | 12.98 | 9.0 | 3.43 | 14.89 | 24 |
2, pressurization carbonization
Gained 6.4m3 high density soda ash and Sodium chromate-51Cr filtrating change 10m3 sieve-board type carbonating tower over to, and the 10%v/v carbonic acid gas flue gas of chromic salts rotary kiln after the bag udst separation is forced into 0.1MPa with the Roots blower fan, feed carbonating tower, carbonization 10 hours;
3, centrifuging
Gained sodium hydrogencarbonate and Sodium chromate-51Cr slurries filter through s-1000 whizzer (liner 750 polyvinyl filter clothes), and after 270 ℃ of oven dry, gained soda ash directly returns the chromic salts rotary kiln and joins the alkali storehouse gained sodium bicarbonate solid particle through hotblast stove;
4, reclaim Sodium chromate-51Cr filtrating
Gained Sodium chromate-51Cr filtrating is neutralized to PH through sodium pyrosulfate and 6.8 boiled 1 hour, and the gained chromium acid sodium solution gets into the production of industrial sodium dichromate 99.
Embodiment 4
1, pulping and washing
18 tons of flying dusts slowly are added in 12 tons of flying dust wash heat water, are heated to 80 ℃, stirred 1.5 hours, the Plate Filtration washing, gained flying dust slag (1) is used to smelt chromium cast iron contained; Gained 8.4m3 lower concentration filtrating is squeezed into flying dust pulp pond; Under whipped state, evenly add 5.6 tons of flying dusts, be heated to 80 ℃, stirred 1.5 hours; Plate Filtration washing, gained high density filtrating pressurization carbonization, high density filtrate main carbonated sodium and Sodium chromate-51Cr, gained flying dust slag (2) is used for the smelting of chromium cast iron contained;
Flying dust and flying dust slag ingredient see the following form
| Project | Na 2CrO 4 | Na 2CO 3 | Cr 2O 3 | Fe 2O 3 | Al 2O 3 | SiO 2 | CaO | MgO | Moisture content |
| Flying dust (%) | 3.95 | 13.56 | 14.16 | 21.58 | 9.34 | 6.82 | 2.98 | 13.05 | 0 |
| Flying dust slag (1) (%) | 0.012 | 2.18 | 17.63 | 26.73 | 12.33 | 7.95 | 3.24 | 14.43 | 23.6 |
| Flying dust slag (2) (%) | 0.014 | 2.34 | 17.85 | 26.96 | 12.38 | 8.05 | 3.19 | 14.56 | 23.8 |
2, pressurization carbonization
Gained 5.8m3 soda ash and Sodium chromate-51Cr filtrating change 10m3 sieve-board type carbonating tower over to, and the 12%v/v carbonic acid gas flue gas of chromic salts rotary kiln after the bag udst separation is forced into 0.5MPa with the Roots blower fan, feed carbonating tower, carbonization 5 hours;
3, centrifuging
Gained sodium hydrogencarbonate and Sodium chromate-51Cr slurries filter through s-1000 whizzer (liner 750 polyvinyl filter clothes), and after 140 ℃ of oven dry, gained soda ash directly returns the chromic salts rotary kiln and joins the alkali storehouse gained sodium hydrogencarbonate through hotblast stove;
4, reclaim Sodium chromate-51Cr filtrating
Gained Sodium chromate-51Cr filtrating is neutralized to PH through the vitriol oil and 6.8 boiled 1 hour, and the gained chromium acid sodium solution gets into the production of industrial sodium dichromate 99.
Embodiment 5
1, pulping and washing
10 tons of flying dusts slowly are added in 10 tons of flying dust wash heat water, are heated to 75 ℃, stirred 1 hour, the Plate Filtration washing, gained flying dust slag (1) is used to smelt chromium cast iron contained; Gained 7m3 lower concentration soda ash and Sodium chromate-51Cr filtrating are squeezed into flying dust pulp pond; Under whipped state, evenly add 5 tons of flying dusts, be heated to 85 ℃, stirred 2 hours; The Plate Filtration washing, gained high density soda ash and Sodium chromate-51Cr filtrating pressurization carbonization, flying dust slag (2) is used for the smelting of chromium cast iron contained;
Flying dust and flying dust slag ingredient see the following form
| Project | Na 2CrO 4 | Na 2CO 3 | Cr 2O 3 | Fe 2O 3 | Al 2O 3 | SiO 2 | CaO | MgO | Moisture content |
| Flying dust (%) | 3.05 | 13.25 | 16.0 | 21.85 | 8.0 | 7.23 | 2.76 | 13.96 | 0 |
| Flying dust slag (1) (%) | 0.011 | 2.68 | 18.95 | 26.86 | 14.62 | 8.95 | 3.06 | 14.98 | 23.1 |
| Flying dust slag (2) (%) | 0.015 | 2.76 | 18.85 | 26.92 | 14.69 | 8.92 | 3.03 | 15.0 | 24 |
2, pressurization carbonization
Gained 5m3 soda ash and Sodium chromate-51Cr filtrating change 10m3 sieve-board type carbonating tower over to, and the 9%v/v carbonic acid gas flue gas of chromic salts rotary kiln after the bag udst separation is forced into 0.4MPa with the Roots blower fan, feed carbonating tower, carbonization 7 hours;
3, centrifuging
Gained sodium hydrogencarbonate and Sodium chromate-51Cr slurries filter through s-1000 whizzer (liner 750 polyvinyl filter clothes), and after 300 ℃ of oven dry, gained soda ash directly returns the chromic salts rotary kiln and joins the alkali storehouse gained sodium hydrogencarbonate through hotblast stove;
4, reclaim chromium acid sodium solution
Gained Sodium chromate-51Cr filtrating is neutralized to PH through sodium pyrosulfate and 6.8 boiled 1 hour, and the gained chromium acid sodium solution gets into the production of industrial sodium dichromate 99.
Claims (2)
1. chromic salts rotary kiln flying dust improvement method is characterized in that it comprises the step of following extraction soda ash:
A, pulping and washing
Flying dust that the chromic salts rotary kiln is collected and water are pressed mass ratio 1:1～2 batching pulping and washing flying dusts, are heated to 70～85 ℃, stir 1～2 hour; Plate Filtration washs to such an extent that lower concentration is filtrated; Lower concentration filtrating and flying dust are heated to 70～85 ℃ by mass ratio 1～2:1 pulping and washing flying dust once more of preparing burden, and stir 1～2 hour; Plate Filtration washs to such an extent that high density is filtrated
B, pressurization carbonization
A step gained high density filtrating is squeezed into the sieve-board type carbonating tower, the carbonic acid gas flue gas of chromic salts rotary kiln after sack cleaner purifies is forced into 0.01～0.5MPa, feed the sieve-board type carbonating tower, carbonization 5～12 hours;
C, centrifuging
With B step carbonization gained slurries, separate through whizzer, obtain the sodium bicarbonate solid particle, after 140～300 ℃ of oven dry, process soda ash through hotblast stove.
2. chromic salts rotary kiln flying dust improvement method according to claim 1; It is characterized in that it also comprises recovery Sodium chromate-51Cr filtrating step: it is 5.5～6.8 that said C step whizzer filtration gained Sodium chromate-51Cr filtrating is neutralized to PH through sulfuric acid, and the production line that can get into industrial sodium dichromate 99 reclaims Sodium chromate-51Cr.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011102674382A CN102432040B (en) | 2011-09-09 | 2011-09-09 | Method for treating fly ash of chromic salt rotary kiln |
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| CN2011102674382A CN102432040B (en) | 2011-09-09 | 2011-09-09 | Method for treating fly ash of chromic salt rotary kiln |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113953303A (en) * | 2021-08-31 | 2022-01-21 | 江西盖亚环保科技有限公司 | Method for reinforced washing of fly ash and resource utilization of high-salinity wastewater |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6228335B1 (en) * | 1997-12-10 | 2001-05-08 | Fmc Wyoming Corporation | Process for the production of sodium carbonate crystals |
| CN101347663A (en) * | 2007-07-19 | 2009-01-21 | 东北大学 | Comprehensive utilization method of three kinds of waste slags containing chromium |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6228335B1 (en) * | 1997-12-10 | 2001-05-08 | Fmc Wyoming Corporation | Process for the production of sodium carbonate crystals |
| CN101347663A (en) * | 2007-07-19 | 2009-01-21 | 东北大学 | Comprehensive utilization method of three kinds of waste slags containing chromium |
Non-Patent Citations (1)
| Title |
|---|
| 大连化工研究设计院编著: "《纯碱工学》", 30 April 2004, 化学工业出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113953303A (en) * | 2021-08-31 | 2022-01-21 | 江西盖亚环保科技有限公司 | Method for reinforced washing of fly ash and resource utilization of high-salinity wastewater |
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