CN106480309A - Dust and mud pellet for alkali metal removal treatment and preparation method thereof - Google Patents
Dust and mud pellet for alkali metal removal treatment and preparation method thereof Download PDFInfo
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- CN106480309A CN106480309A CN201510548237.8A CN201510548237A CN106480309A CN 106480309 A CN106480309 A CN 106480309A CN 201510548237 A CN201510548237 A CN 201510548237A CN 106480309 A CN106480309 A CN 106480309A
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- dust
- alkali metal
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- solid waste
- dirt mud
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- 150000001340 alkali metals Chemical class 0.000 title claims abstract description 32
- 229910052783 alkali metal Inorganic materials 0.000 title claims abstract description 31
- 239000008188 pellet Substances 0.000 title claims abstract description 25
- 239000000428 dust Substances 0.000 title claims abstract description 18
- 238000002360 preparation method Methods 0.000 title claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 47
- 239000002910 solid waste Substances 0.000 claims abstract description 40
- 239000000203 mixture Substances 0.000 claims abstract description 30
- 229910052742 iron Inorganic materials 0.000 claims abstract description 22
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 20
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims abstract description 19
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 14
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 14
- 235000011116 calcium hydroxide Nutrition 0.000 claims abstract description 14
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000000654 additive Substances 0.000 claims abstract description 13
- 230000000996 additive effect Effects 0.000 claims abstract description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 11
- 239000011230 binding agent Substances 0.000 claims abstract description 10
- 239000011787 zinc oxide Substances 0.000 claims abstract description 10
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 8
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 8
- 229910052700 potassium Inorganic materials 0.000 claims abstract description 8
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 8
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 8
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 8
- 239000001301 oxygen Substances 0.000 claims abstract description 7
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 7
- 238000005245 sintering Methods 0.000 claims abstract description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000007789 gas Substances 0.000 claims abstract description 5
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 5
- 238000004939 coking Methods 0.000 claims abstract description 4
- 239000010802 sludge Substances 0.000 claims description 21
- 239000001110 calcium chloride Substances 0.000 claims description 18
- 238000005453 pelletization Methods 0.000 claims description 18
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 16
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 15
- 235000013980 iron oxide Nutrition 0.000 claims description 10
- 239000011343 solid material Substances 0.000 claims description 10
- 239000007864 aqueous solution Substances 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 8
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 6
- 229920002472 Starch Polymers 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 235000019698 starch Nutrition 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000008107 starch Substances 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 239000004615 ingredient Substances 0.000 abstract 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 20
- 238000000034 method Methods 0.000 description 20
- 239000011701 zinc Substances 0.000 description 19
- 229910052725 zinc Inorganic materials 0.000 description 17
- 238000006722 reduction reaction Methods 0.000 description 13
- 229910000831 Steel Inorganic materials 0.000 description 9
- 238000001465 metallisation Methods 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 239000000460 chlorine Substances 0.000 description 8
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 6
- 238000004064 recycling Methods 0.000 description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 5
- 239000003546 flue gas Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 150000001339 alkali metal compounds Chemical class 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L magnesium chloride Substances [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 3
- 229910020451 K2SiO3 Inorganic materials 0.000 description 3
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 3
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 3
- 229910001514 alkali metal chloride Inorganic materials 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 229910001629 magnesium chloride Inorganic materials 0.000 description 3
- 229920002401 polyacrylamide Polymers 0.000 description 3
- 239000011591 potassium Substances 0.000 description 3
- 229910000027 potassium carbonate Inorganic materials 0.000 description 3
- 238000003672 processing method Methods 0.000 description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 229910052910 alkali metal silicate Inorganic materials 0.000 description 2
- 238000005660 chlorination reaction Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 230000001698 pyrogenic effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 150000003752 zinc compounds Chemical class 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 241001408630 Chloroclystis Species 0.000 description 1
- 241000254158 Lampyridae Species 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 229910001308 Zinc ferrite Inorganic materials 0.000 description 1
- 239000004110 Zinc silicate Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- KFZAUHNPPZCSCR-UHFFFAOYSA-N iron zinc Chemical compound [Fe].[Zn] KFZAUHNPPZCSCR-UHFFFAOYSA-N 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 150000002927 oxygen compounds Chemical class 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000010801 sewage sludge Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000009491 slugging Methods 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- JBQYATWDVHIOAR-UHFFFAOYSA-N tellanylidenegermanium Chemical compound [Te]=[Ge] JBQYATWDVHIOAR-UHFFFAOYSA-N 0.000 description 1
- 229910052882 wollastonite Inorganic materials 0.000 description 1
- WGEATSXPYVGFCC-UHFFFAOYSA-N zinc ferrite Chemical compound O=[Zn].O=[Fe]O[Fe]=O WGEATSXPYVGFCC-UHFFFAOYSA-N 0.000 description 1
- XSMMCTCMFDWXIX-UHFFFAOYSA-N zinc silicate Chemical compound [Zn+2].[O-][Si]([O-])=O XSMMCTCMFDWXIX-UHFFFAOYSA-N 0.000 description 1
- 235000019352 zinc silicate Nutrition 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a dust and mud pellet for alkali metal removal treatment, which comprises the following ingredients, by mass, 85% -95% of a dust and mud solid waste batch mixture, 0% -5% of a binder, 0% -10% of slaked lime and the balance of an additive; controlling the TFe of the dust-mud pellets to be more than or equal to 40 percent, controlling the molar ratio of the carbon content to the total oxygen content of iron oxide and zinc oxide to meet (C/O) 1.1-1.5, and controlling the CaO and SiO2Mass percent of component [ CaO%]/[SiO2]1.0 to 2.0, wherein the molar ratio of the alkali metal element (K, Na) to the Cl element is 0.5 to 1.0; the dust mud solid waste batch comprises two or more of blast furnace dust, gas mud, sintering dust, converter mud, iron scale, iron oxide red and coking dust.
Description
Technical field
The invention belongs to technical field of ferrous metallurgy, relate generally to a kind of sludge pellet and preparation method thereof, particularly to a kind of suitable
Removing alkali metal treated sludge pellet for horizontal moving bed reducing process and preparation method thereof.
Background technology
Traditional iron and steel enterprise all can produce substantial amounts of dirt mud solid waste in operations such as ironmaking, steel-making and steel rolling, accounts for total output of steel
More than 10%.Often contain a large amount of ferrum in these dirt mud and there is very high recovery value, returning sintering as dispensing is still mesh
Front topmost way of recycling, such as " method that a kind of ion dust mud contaning of CN102492833A is applied to sinter " etc., also have and join
Enter the mode that pelletizing is reclaimed, for example " CN200410040020.8 steel-smelting sewage sludge starches the method for pelletizing production pelletizing "
Deng, but there are a lot of problems in such method, because the physical parameter of dirt pug is larger with breeze materials variance, to sintering or pelletizing
Production and technical indication and product quality impact are larger；Often contain more alkali metal (K, Na), zinc (Zn) in dirt pug simultaneously
Deng harmful element, directly return raw material and a large amount of enrichments in blast furnace for the harmful element, impact blast furnace stable smooth operation and safety will be led to long
Longevity, therefore be extremely limited using the dirt mud amount that such method recycles, enterprise can only be stored up using a large amount of places, if dealing with improperly,
Not only caused the wasting of resources but also easily environment had been impacted.Therefore, how dirt mud solid wastes recycling more effectively to be reclaimed profit
With becoming an important topic of iron and steel enterprise.
As long as it is true that the harmful elements such as the alkali metal in dedusting pug, zinc can effectively be removed, it recycles approach will very
Extensively.Presently, there are some treatment technologies for iron and steel enterprise's dirt mud dezincification, for example " CN101386913 rotary hearth furnace processes and contains
The method that zinc powder dirt reclaims zinc oxide ", " CN104073649A iron content zinc powder dirt recycle technique ", " CN101092664 contains zinc
The processing method of electric furnace dust ", is substantially and allocates the reducing agents such as coal into and make carbonaceous pelletizing, and then passes through rotary hearth furnace, shaft furnace etc.
Be reduced into metallized pellet, after zinc reduction, enter flue gas, above-mentioned process dirt mud patent have in common that universal just for removing zinc,
And actually all containing alkali metal and zinc in iron and steel enterprise's number of types of dirt mud solid waste simultaneously, the alkali metal in some dirt pugs contains
Amount is even above zinc, but because the reduction temperature ratio of zinc compound is relatively low, usual dezincification is relatively easy, and alkali metal compound is (such as
Alkali silicate) reduction temperature is generally higher, and relative difficulty is wanted in removing, ultimately results in alkali metal and still resides in metal in a large number
Change in raw material.In addition the patent such as " a kind of zinc-iron-containing dust of CN101818264A, processing method of mud " discloses and utilizes high temperature
Sludge pellet is reduced fusing by molten iron, makes reduced iron enter molten iron, and zinc enters flue gas, and other impurity enter the processing method of slag,
But the dirt mud treating capacity of the method is limited, otherwise may impact hot metal composition and temperature, simultaneously this method generally add firefly for slugging
Stone composition, the commonly used tank lining that easily causes corrodes.
To sum up, due to containing the harmful elements such as more alkali metal, zinc in dirt mud solid waste material, its recycling is extremely restricted,
The also many removings just for zinc of some treatment technologies that presently, there are or method, and how to realize alkali-metal efficient removal to entering one
It is great that step improves its recycling horizontal terms.
Technical scheme
The technical problem to be solved is to provide a kind of removing alkali metal treated sludge pellet and preparation method thereof, with reality
Alkali metal in efficient removal iron and steel enterprise dirt mud solid waste material under present 1100 DEG C～1300 DEG C temperature conditionss, thus be greatly improved smelting
Golden dirt mud resource utilizes level.
For solving the above problems, the technical scheme is that：
A kind of removing alkali metal treated sludge pellet it is characterised in that：Its composition includes dirt mud solid waste Glass Batch Quality hundred
Ratio is divided to be 85%～95%, binding agent mass percent 0%～5%, slaked lime mass percent 0%～10%, remaining is additive.
By reasonably combined, control TFe >=40% of sludge pellet, carbon content and iron oxides, the oxygen element total content of zinc oxide
Mol ratio meets (C/O)=1.1～1.5, CaO and SiO2Mass percent [CaO]/[SiO of composition2]=1.0～2.0, alkali metal unit
Plain (K, Na) meets (K+Na)/Cl=0.5～1.0 with Cl elemental mole ratios；Described dirt mud solid waste batch include blast furnace dedusting ash,
In gas mud, sintering dust separation ash, converter dust-removing ash, revolving furnace mud, iron scale, iron oxide red, coking, dust removing ash two kinds or two kinds
More than；Described binding agent is one of starch or other organic binder bonds；Described additive includes industrial calcium chloride, industrial chlorine
Change one of magnesium.
The consumption of described slaked lime is according to CaO and SiO in described dirt mud solid waste batch2The mass percent of composition determines, if
Described CaO and SiO2Mass percent [CaO]/[SiO of composition2] be less than 1.0, then adding appropriate slaked lime makes [CaO]/[SiO2]
=1.0～2.0, otherwise need not add.
The CaCl of described industrial calcium chloride2Content >=90%, the MgCl of described industrial hex-ammoniate2Content >=45%.
A kind of removing alkali metal treated is with the preparation method of sludge pellet it is characterised in that being closed according to each material chemical analysis
Reason dispensing, first rolls fully broken for the solid materials such as dirt mud solid waste batch, slaked lime, then puts it in batch mixer
Row premix；Desired amount of additive and binding agent are added in suitable quantity of water simultaneously and be made into aqueous solution, treat solid material mix homogeneously
Inject aqueous solution afterwards and be stirred again mixing, after mix homogeneously send into final mixed material in ball press, be pressed into
10mm～30mm pelletizing, after pelletizing drying to moisture≤3%, becomes sludge pellet of the present invention.
The dirt mud solid waste material by reasonably combined iron and steel enterprise for the present invention, makes high ferro dirt mud complementary with high carbon dust mud element, fully profit
The carbon itself being rich in dirt mud is it is not necessary to more additionally with addition of reducing agent, be pressed into pelletizing, further under the auxiliary of a small amount of binding agent
Carry out subsequent treatment in conjunction with pyrogenic process direct-reduction technique, can the harmful element such as efficient removal alkali metal, and obtain metallization iron charge,
Thus its recycling level is greatly improved.
In order that the metallization iron charge obtaining after processing reaches certain taste, dirt mud batch TFe content to be properly increased, simultaneously
Take into account rationally a large amount of adapteds of dirt pug, substantially control the balance that can meet in TFe >=40% from the aspect of two.
Pass through to control carbon-to-oxygen ratio (C/O) simultaneously, make to join that carbon is suitably excessive in pelletizing, the reducing atmosphere of such pelletizing bed of material and temperature
Degree is readily obtained guarantee, and test shows under the range of condition of (C/O)=1.1～1.5, and iron oxides and zinc impregnation in sludge pellet of the present invention is closed
Thing can sufficiently be reduced.
In dirt mud solid waste material, removing zinc is reduced directly relatively easily by pyrogenic process, because reduction started temperature all phases of zinc compound
To relatively low, be will also realize that by calculation of thermodynamics, ferrite (the ZnO Fe of zinc2O3), silicate (2ZnO SiO2), oxygen
Compound (ZnO) etc. and C direct reduction reactor can occur below at 1000 DEG C substantially, much studied and also indicated that and will realize
The more thoroughly removing of zinc is relatively easy, and the reduction relative difficulty of alkali metal K, Na compound is many, such as silicate (K2SiO3、
Na2SiO3), carbonate (K2CO3、Na2CO3) etc., its direct-reduction is temperature required higher, and the especially reduction of silicate needs
The high temperature wanting 1600 DEG C about just starts to react, and therefore removes alkali metal relative difficulty by high temperature reduction.And the present invention is due to adopting
With chloride additive so as to remove the easy, in CaCl of change2Or MgCl2In the presence of, alkali metal compound can be with
Its generation displacement reaction generates corresponding alkali metal chloride, and reaction is as follows (with K compound, CaCl2As a example)：
K2SiO3+ C=2K+CO+SiO2→K2SiO3+CaCl2=2KCl+CaSiO3
K2CO3+ 2C=2K+3CO → K2CO3+CaCl2=2KCl+3CaCO3
Thermodynamically the reaction Gibbs free energy of the latter is negative value always, and is easy to wave under alkali metal chloride hot conditionss
Send out, add quick flow of flue gas purification, make the thermodynamics and kineticses condition of reaction all ideal, so that alkali is golden
Belonging to also being capable of efficient removal.In order to ensure the abundant of reaction, the consumption of agent is accordingly suitably excessively added, research shows in alkali metal
Under conditions of meeting (K+Na)/Cl=0.5～1.0 with Cl elemental mole ratios, optimal dealkalize effect can be obtained.
Test finds further, can play facilitation to the removing of alkali metal and zinc under a certain amount of CaO existence condition,
Think that the compounds such as zinc ferrite, zinc silicate, alkali silicate can occur correlated response further with CaO, make
The reduction reaction of these compounds or displacement reaction temperature have the trend reducing further, therefore properly increase basicity to removing alkali
Metal and zinc are all favourable, control basicity in [CaO]/[SiO2Removal efficiency highest during]=1.0～2.0 scope.And in major part dirt mud
Natural alkalinity all higher, essentially without additionally condition can be met with addition of material containing CaO, when need on a small quantity with addition of when,
Consider that slaked lime fully digests, have certain colloidal nature simultaneously concurrently, therefore select not using limestone with addition of slaked lime.
Sludge pellet of the present invention is used in horizontal moving bed class reducing process processing, can achieve alkali-metal efficient removal,
The final metallization iron charge obtaining degree of metalization more than 70%, potassium, soda metal removal rate reach more than 90%.
Beneficial effects of the present invention：
The present invention removes alkali metal treated sludge pellet, by the dirt mud solid waste material of reasonably combined iron and steel enterprise, can be fully sharp
With the carbon that is wherein rich in it is not necessary to more additionally with addition of reducing agent, obtain metallization iron charge product, pass through to add appropriate in addition
Additive simultaneously adjusts suitable alkalinity, makes the alkali metal compound of difficult reduction be replaced into volatile chloride removing, thus realizing
Efficient dealkalize to dirt mud solid waste material is processed, and its recycling level is greatly improved.
By in horizontal moving bed class reducing process using sludge pellet of the present invention, in 1100 DEG C～1300 DEG C sintering temperatures
Under the conditions of process, the metallization iron charge that degree of metalization is more than 70% can be obtained, potassium, soda metal removal rate reach more than 90%,
Zinc removal efficiency also reaches more than 96% simultaneously.
Specific embodiment
Illustrate with reference to specific embodiment：
Embodiment 1
Dirt mud solid waste batch uses revolving furnace mud, blast furnace gas mud, blast furnace dedusting ash, blast furnace dust, iron scale, according to
Its chemical composition carries out reasonably combined, controls TFe >=40% of dirt mud solid waste batch, control simultaneously carbon content and iron oxides,
The oxygen element total content mol ratio of zinc oxide meets (C/O)=1.1, obtains dirt mud batch composition as shown in table 1.According to dirt
It is [CaO]/[SiO that mud solid waste batch detection composition calculates basicity2]=1.55, can not be with addition of slaked lime in the present embodiment.
The present embodiment uses industrial chlorinations calcium additive (CaCl2Content 92%), according to the alkali metal of dirt mud solid waste batch
Learn component molar ratio [(K+Na)/Cl]=0.5～1.0, can be calculated 100g dirt mud solid waste batch needs with addition of 2.7g～5.4g
CaCl2, converting as industrial calcium chloride is 2.9～5.9g.
By above-mentioned dirt mud solid waste Glass Batch Quality percentage ratio 90%, industrial calcium chloride mass percent 5%, starch quality percentage ratio
5% gets the raw materials ready.First roll fully broken for the solid materials such as dirt mud solid waste batch, then put it in batch mixer and premixed；
Desired amount of industrial calcium chloride and starch are added in suitable quantity of water simultaneously and be made into aqueous solution, inject after solid material mix homogeneously
Aqueous solution simultaneously is stirred mixing again, sends into final mixed material in ball press, be pressed into after mix homogeneously
10mm～30mm pelletizing, after pelletizing drying to moisture≤3%, becomes sludge pellet of the present invention.
Table 1 dirt mud solid waste batch chemical composition %
| TFe | FeO | C | SiO2 | CaO | K2O | Na2O | Zn |
| 45.13 | 31.78 | 16.16 | 4.37 | 6.76 | 1.35 | 0.62 | 2.31 |
Embodiment 2
According to embodiment 1 same steps, dirt mud solid waste batch uses blast furnace dedusting ash, gas mud, sintering dust separation ash, converter
Dedusting ash, revolving furnace mud, iron scale, iron oxide red, coking, dust removing ash, carry out according to its chemical composition reasonably combined, control dirt mud
TFe >=40% of solid waste batch, controls carbon content full with the oxygen element total content mol ratio of iron oxides, zinc oxide simultaneously
Foot (C/O)=1.5.Detect that composition calculates basicity [CaO]/[SiO according to dirt mud solid waste batch2]=0.92, passes through in the present embodiment to join
Plus 0.5g～7.2g slaked lime can adjust basicity and reach 1.0～2.0 scopes.
The present embodiment uses industrial chlorinations magnesium additive (MgCl2Content 45%), according to the alkali metal of dirt mud solid waste batch
Learn component molar ratio [(K+Na)/Cl]=0.5～1.0, can be calculated 100g dirt mud solid waste batch needs with addition of 3.1g～6.2g
MgCl2, convert and need with addition of 6.9g～13.8g for industrial hex-ammoniate.
By above-mentioned dirt mud solid waste Glass Batch Quality percentage ratio 86%, slaked lime mass percent 4%, industrial hex-ammoniate percent mass
Get the raw materials ready than 10%.First the solid materials such as dirt mud solid waste batch, slaked lime are carried out crushing and roll, then put it into batch mixing
Premixed in machine；Desired amount of industrial hex-ammoniate is added in suitable quantity of water simultaneously and be made into additive solution, treat that solid material mixes
Close and uniformly inject additive aqueous solution afterwards and be stirred again mixing, after mix homogeneously, final mixed material is sent into ball press
In, it is pressed into 10mm～30mm pelletizing, after pelletizing drying to moisture≤3%, become sludge pellet of the present invention.
Embodiment 3
According to embodiment 1 same steps, dirt mud solid waste batch uses blast furnace dedusting ash, revolving furnace mud, is entered according to its chemical composition
Row is reasonably combined, controls TFe >=40% of dirt mud solid waste batch, controls carbon content and iron oxides, zinc oxide simultaneously
Oxygen element total content mol ratio meets (C/O)=1.3.Detect that composition calculates basicity according to dirt mud solid waste batch
[CaO]/[SiO2]=1.38, can not be with addition of slaked lime in the present embodiment.
Using industrial calcium chloride (CaCl in the present embodiment2Content 90%) additive, according to the alkali metal of dirt mud solid waste batch
Chemical composition mol ratio [(K+Na)/Cl]=0.5～1.0, can be calculated 100g dirt mud solid waste batch needs with addition of 3.4g～6.8g's
CaCl2, converting as industrial calcium chloride is 3.8g～7.6g.
By above-mentioned dirt mud solid waste Glass Batch Quality percentage ratio 94%, industrial calcium chloride mass percent 4.5%, polyacrylamide
(PAM) mass percent 1.5% is got the raw materials ready.First the solid materials such as dirt mud solid waste batch are carried out crushing and roll, then by it
Put in batch mixer and premixed；Desired amount of industrial calcium chloride and PAM are added in suitable quantity of water simultaneously and are made into aqueous solution,
Inject aqueous solution and be stirred again mixing after solid material mix homogeneously, after mix homogeneously, final mixed material is sent into
In ball press, it is pressed into 10mm～30mm pelletizing, after pelletizing drying to moisture≤3%, become dirt mud ball of the present invention
Group.
Sludge pellet of the present invention is used in the horizontal moving bed class reducing process such as rotary hearth furnace, in 1100 DEG C～1300 DEG C roastings
Process 20min～40min under temperature conditionss, join in excess under carbon effect, iron oxides are reduced into metallic iron, easily reduce
Zinc oxide is reduced into low boiling simple substance, and the alkali metal compound of difficult reduction is also replaced into volatile chloride, fast
Under fast flow of flue gas purification, the zinc of volatilization and alkali metal chloride are constantly taken away by flue gas, thus realizing efficient removal,
Obtain the metallization iron charge of degree of metalization more than 70% eventually, potassium, soda metal removal rate reach more than 90%, simultaneously zinc removing
Rate also reaches more than 96%.
Claims (3)
1. a kind of removing alkali metal treated sludge pellet it is characterised in that：Its composition includes dirt mud solid waste batch matter
Amount percentage ratio is 85%～95%, binding agent mass percent 0%～5%, slaked lime mass percent 0%～10%, and remaining is to add
Plus agent；Control TFe >=40% of sludge pellet, carbon content is full with the oxygen element total content mol ratio of iron oxides, zinc oxide
Foot (C/O)=1.1～1.5, CaO and SiO2Mass percent [CaO]/[SiO of composition2]=1.0～2.0, alkali metal (K, Na)
Meet (K+Na)/Cl=0.5～1.0 with Cl elemental mole ratios；Described dirt mud solid waste batch include blast furnace dedusting ash, gas mud,
Sintering dust separation ash, converter dust-removing ash, revolving furnace mud, iron scale, iron oxide red, coking, dust removing ash in two or more；Institute
Stating binding agent is one of starch or other organic binder bonds；Described additive includes industrial calcium chloride, in industrial hex-ammoniate
A kind of.
2. according to claim 1 removing alkali metal treated sludge pellet it is characterised in that：Described industrial calcium chloride
CaCl2Weight/mass percentage composition >=90%, the MgCl of described industrial hex-ammoniate2Weight/mass percentage composition >=45%.
3. a kind of according to claim 1 removing alkali metal treated sludge pellet preparation method it is characterised in that
Carry out dispensing according to each material chemical analysis, first roll fully broken to dirt mud solid waste batch, slaked lime solid material, then
Put it in batch mixer and premixed；Desired amount of additive and binding agent are added in suitable quantity of water simultaneously and are made into aqueous solution,
Inject aqueous solution and be stirred again mixing after solid material mix homogeneously, after mix homogeneously, final mixed material is sent into
In ball press, it is pressed into 10mm～30mm pelletizing, after pelletizing drying to biodiversity percentage composition≤3%, become this
Bright described sludge pellet.
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| CN201510548237.8A CN106480309A (en) | 2015-08-31 | 2015-08-31 | Dust and mud pellet for alkali metal removal treatment and preparation method thereof |
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| CN201510548237.8A CN106480309A (en) | 2015-08-31 | 2015-08-31 | Dust and mud pellet for alkali metal removal treatment and preparation method thereof |
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