CN102432040B - 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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- CN102432040B CN102432040B CN2011102674382A CN201110267438A CN102432040B CN 102432040 B CN102432040 B CN 102432040B CN 2011102674382 A CN2011102674382 A CN 2011102674382A CN 201110267438 A CN201110267438 A CN 201110267438A CN 102432040 B CN102432040 B CN 102432040B
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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 sedimentand 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 through sack cleaner, generation accounts for the prepare burden flying dust of 7w%～8w% of total charging capacity of rotary kiln, 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 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:
The flying dust that A, chromic salts rotary kiln collect press mass ratio 1:1～2 batching pulping and washing flying dusts with water, is heated to 70～85 ℃, stirred 1～2 hour, Plate Filtration wash lower concentration filtrate, the gained filter cake is for the smelting chromium cast iron contained; Lower concentration filtrate and flying dust are heated to 70～85 ℃ by mass ratio 1～2:1 pulping and washing flying dust again of preparing burden, stirred 1～2 hour, Plate Filtration wash high density filtrate, the gained filter cake is used for smelting chromium cast iron contained.
The chemical ingredients of untreated flying dust is as follows:
| 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 as follows:
| 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 filtrate 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 by whizzer, obtain the sodium bicarbonate solid particle, after 140～300 ℃ of oven dry, make soda ash through hotblast stove, return chromic salts rotary kiln soda ash batching storehouse.
As a further improvement on the present invention, it also comprises reclaims Sodium chromate filtrate step: described C step whizzer is filtered gained Sodium chromate filtrate (the main Sodium chromate that contains), being neutralized to pH through sulfuric acid is 5.5～6.8, and the production line that enters industrial sodium dichromate 99 reclaims Sodium chromate.
Beneficial effect of the present invention is the flying dust that the chromic salts rotary kiln is discharged is taken full advantage of, not only soda ash and Sodium chromate in the 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 process flow sheet of the present invention.
Embodiment
The following examples can further specify the present invention, but do 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 for smelting chromium cast iron contained; Gained lower concentration filtrate 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 filtrate pressurization carbonization, the filtrate master contains yellow soda ash and Sodium chromate, and flying dust slag (2) is used for smelting 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 filtrate (main soda ash and the Sodium chromate 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 type blower fan, feeds carbonating tower, carbonization 12 hours;
3, centrifuging
Gained sodium bicarbonate and Sodium chromate 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 filtrate
With the Sodium chromate filtrate of embodiment 1 gained 7m3, be neutralized to pH through the vitriol oil and 5.5 boil and obtained chromium acid sodium solution in 1 hour and enter 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 for smelting chromium cast iron contained; Gained 10m3 lower concentration filtrate is 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 filtrate pressurization carbonization, high density filtrate master contains yellow soda ash and Sodium chromate, and 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 filtrate 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 type blower fan, feed carbonating tower, carbonization 10 hours;
3, centrifuging
Gained sodium bicarbonate and Sodium chromate 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 filtrate
Gained Sodium chromate filtrate is neutralized to pH through sodium pyrosulfate and 6.8 boiled 1 hour, and the gained chromium acid sodium solution enters 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 for smelting chromium cast iron contained; Gained 8.4m3 lower concentration filtrate 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; The Plate Filtration washing, gained high density filtrate pressurization carbonization, high density filtrate master contains yellow soda ash and Sodium chromate, and 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 filtrate 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 type blower fan, feed carbonating tower, carbonization 5 hours;
3, centrifuging
Gained sodium bicarbonate and Sodium chromate 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 bicarbonate through hotblast stove;
4, reclaim Sodium chromate filtrate
Gained Sodium chromate filtrate is neutralized to pH through the vitriol oil and 6.8 boiled 1 hour, and the gained chromium acid sodium solution enters 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 for smelting chromium cast iron contained; Gained 7m3 lower concentration soda ash and Sodium chromate filtrate 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 filtrate 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 filtrate 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 type blower fan, feed carbonating tower, carbonization 7 hours;
3, centrifuging
Gained sodium bicarbonate and Sodium chromate 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 bicarbonate through hotblast stove;
4, reclaim chromium acid sodium solution
Gained Sodium chromate filtrate is neutralized to pH through sodium pyrosulfate and 6.8 boiled 1 hour, and the gained chromium acid sodium solution enters 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
The 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, be heated to 70～85 ℃, stirred 1～2 hour, Plate Filtration wash lower concentration filtrate, lower concentration filtrate and flying dust are heated to 70～85 ℃ by mass ratio 1～2:1 pulping and washing flying dust again of preparing burden, and stir 1～2 hour, Plate Filtration wash high density filtrate
B, pressurization carbonization
A step gained high density filtrate 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 by whizzer, obtain the sodium bicarbonate solid particle, after 140～300 ℃ of oven dry, make 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 filtrate step: it is 5.5～6.8 that described C step whizzer filtration gained Sodium chromate filtrate is neutralized to pH through sulfuric acid, and the production line that can enter industrial sodium dichromate 99 reclaims Sodium chromate.
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