CN101805827B - Sludge oxidized pellet and its preparation method - Google Patents
Sludge oxidized pellet and its preparation method Download PDFInfo
- Publication number
- CN101805827B CN101805827B CN2009100461331A CN200910046133A CN101805827B CN 101805827 B CN101805827 B CN 101805827B CN 2009100461331 A CN2009100461331 A CN 2009100461331A CN 200910046133 A CN200910046133 A CN 200910046133A CN 101805827 B CN101805827 B CN 101805827B
- Authority
- CN
- China
- Prior art keywords
- heavy metal
- stainless
- sewage sludge
- steel cold
- acid pellet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Manufacture And Refinement Of Metals (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a purpose of sludge and a preparation method thereof. The acid pellet of the sludge is mainly prepared by the following raw materials by weight percent: 5-50 percent of stainless steel cold-rolling heavy metal sludge, 30-70 percent of iron ore concentrate, 2-8 percent of composite binding agent, 4-15 percent of carbon powder and 10-30 percent of water. The preparation method of the acid pellet of the sludge comprises the main steps of pretreatment of raw materials, mixing of raw materials, pelletizing and roasting. The acid pellet of the sludge is used as a raw material of a blast furnace. The invention solves the problems that the prior art can not effectively treat and comprehensively utilize the stainless steel cold-rolling heavy metal sludge.
Description
Technical field
The invention belongs to the comprehensive utilization field of stainless-steel cold-rolling heavy metal sewage sludge, relate to the purposes of stainless-steel cold-rolling heavy metal sewage sludge; The invention still further relates to a kind of mud acid pellet, being specifically related to the stainless-steel cold-rolling heavy metal sewage sludge is the mud acid pellet that main raw material is made; The invention still further relates to manufacture method of this mud acid pellet and uses thereof.
Background technology
In stainless steel coiled sheet pickling process, can produce a large amount of pickling waste waterss, the principal pollutant composition has: T.Fe, Cr
6+, T.Cr, Ni
2+, F
-, SO
4 2-, S.S, Zn
2+, Pb
2+Deng.Comparatively ripe to this pickling waste waters at present, most widely used treatment process is the chemical reduction precipitator method, and the chemical reduction precipitator method can be divided into " chemical reduction+milk of lime " step precipitator method and " chemical reduction+liquid caustic soda+milk of lime " two-step precipitation method.
" chemical reduction+milk of lime " step precipitator method are as follows: cold rolling wastewater adds excessive milk of lime (Ca (OH) after chemical reduction
2) precipitate, excess coefficient surpasses more than 1 times usually; What " chemical reduction+milk of lime " step precipitator method obtained is mixing sludge." chemical reduction+liquid caustic soda+milk of lime " two-step precipitation method is as follows: cold rolling wastewater adds liquid caustic soda (NaOH) earlier and carries out the leading portion precipitation after chemical reduction, most of heavy metal hydroxide is precipitated with sludge form, such as Fe (OH)
3, Cr (OH)
3, Ni (OH)
2, Cu (OH)
2Deng, and then adding milk of lime carries out back segment precipitation, CaSO
4, CaF
2Just precipitated Deng sludge components.The mud that the leading portion precipitation obtains is called the heavy metal sewage sludge after the enrichment, and the mud that the back segment precipitation obtains is called general heavy metal sewage sludge.Mud is reclaimed in heavy metal sewage sludge after the enrichment, the classification of general heavy metal sewage sludge general designation.(referring to publication number is CN101269889A, open day to be the Chinese invention patent application of 2008.09.24, publication number is CN1418831A, open day to be the Chinese invention patent application of 2003.05.21, publication number is to be CN1197040A, open day that the Chinese invention patent application of 1998.10.28, publication number are CN1048692A, open day to be the Chinese invention patent application of 1991.01.23.)
Up to standard for guaranteeing water outlet, generally need the excessive medicament that adds, so the cold rolling wastewater treatment station will produce a large amount of stainless-steel cold-rolling heavy metal sewage sludges.According to relevant regulations, this class mud belongs to Hazardous wastes (national Hazardous wastes register HW17 and HW21), and must entrust has the department of qualification to deal carefully with or dispose.
China began from the sixties in last century, priority is product, has carried out test and applied research as technologies such as building material made such as glass colorant, production fused(calcium magnesium)phosphate, production glass-ceramic diabases with regard to the brickmaking of stainless-steel cold-rolling heavy metal sewage sludge, production cement, preparation chromium, has obtained progress in various degree.
In the prior art, one of stainless-steel cold-rolling heavy metal sewage sludge metallurgical industry reuse route is the raw material that it is mixed for raw materials for sintering or is used as cooled agglomerated pellet.Cooled agglomerated pellet belongs to the pelletizing of Iron And Steel Industry.The pelletizing of Iron And Steel Industry is divided three classes: oxide pellet, cold-consolidated ball nodulizing, metallic pellet abbreviate acid pellet, cooled agglomerated pellet and metallized pellet respectively as.The pelletizing manufacturing processed of Iron And Steel Industry is as follows: with ready raw material (fine grinding concentrate or other fine grinding pulverulent materials, additive or stick), according to a certain percentage through batching, mixing, on pelletizer, make the green-ball of certain size, adopt drying and roasting or additive method to make it series of physical chemical transformation take place and the unity of hardening then through rolling.In this process, different with parameters such as drying mode, maturing temperature, calcination atmosphere, cooling conditionss in view of processing, the kind that obtains pelletizing is also different.Acid pellet is emphasized high-temperature roasting, surpasses 1100 degree usually, and cooled agglomerated pellet obtains down at normal temperature or low temperature (100～200 ℃), and metallized pellet obtains under reducing atmosphere, lays particular emphasis on to emphasize recovery rate of iron.
When the stainless-steel cold-rolling heavy metal sewage sludge is used as the raw material of cooled agglomerated pellet, the mud chemical component fluctuation greatly and impurity element S wherein, F does not remove in pre-treatment, pelletizing is not high without roasting ultimate compression strength, and the softening temperature interval is wide, and soft heat drippage performance is bad, reduction swellability rate height at high temperature, be applied to blast furnace and not only can cause ventilation property decline and pressure drag to increase sharply, the impurity element in the pelletizing also will enter molten iron, for follow-up desulfurizing iron increases burden.
The stainless-steel cold-rolling heavy metal sewage sludge is mixed for raw materials for sintering when the sintering reuse, because moisture content and chemical component fluctuation are big in the mud, is difficult to the smart powder of iron evenly during blending with wet mud state, and continues the fluorine steam (HF, the SiF that overflow during roasting
4Deng) can cause heavy corrosion to sinter machine and auxiliary facility thereof, simultaneously, the incorporation of mud surpasses 5%, promptly can cause the decline of agglomerate yield rate and tumbler index, thereby influence the direct motion of sinter machine.
Up to now, for have a large capacity and a wide range, the stainless-steel cold-rolling heavy metal sewage sludge of hazardness and resource coexistence, still there are not cost-effective processing and comprehensive utilization technique both at home and abroad, the weak point of existing technology is as follows: different operations and a plurality of industries such as (1) treating processes involves collection, transport, deposit, both increase handling, had the hidden danger of pollution transportation again; The mud amount of dissolving was little when (2) blending was handled, not have industry exemplary, and the metallurgical performance of mud lacked analysed in depth; (3) there are Cr in comprehensive utilization process more complicated, operation less stable
3+Be converted into Cr once more
6+Danger; (4) market of byproduct is limited, and environmental safety is worth deeply assessment; (5) because of mud valuable resource grade is lower, the comprehensive utilization cost is higher, causes most of resource to be underused, and counter have an environmentally hazardous risk.
On the other hand, development along with Iron And Steel Industry, the ironmaking desired raw material is more and more, and can be fewer and feweri directly into the rich ore of stove, though China's iron ore reserves occupy the 5th in the world, wherein the rich ore of iron content more than 50% only accounts for 4%, and be most for containing the lean ore of detrimental impurity, and this class ore is must fine grinding selected after agglomeration just can be gone into the stove smelting.And pellet has caused domestic and international steel attention with its excellent metallurgical performance and superior blast-furnace smelting effect.Some large-scale iron and steel enterprise pellet output increase day by day in the world wide, surpass 20% in charge composition.
The stainless-steel cold-rolling heavy metal sewage sludge belong to chemical constitution fluctuation big, utilize the Hazardous wastes that easily produces secondary pollution in the big and process of difficulty, but as " available secondary resource ", this mud also has following characteristics: Fe, Ca, valuable element content such as Cr, Ni are about 20～50% in (1) stainless-steel cold-rolling heavy metal sewage sludge; (2) contain a spot of CaF in the stainless-steel cold-rolling heavy metal sewage sludge
2, can improve the flowability of slag, also help the dephosphorization under reducing atmosphere in the follow-up steel-making; (3) mud fine size, 90% less than 7.5 μ m, and contain low melting point, can play the effect of binding agent in the roasting; (4) S in the stainless-steel cold-rolling heavy metal sewage sludge exists with calcium sulfate, calcium carbonate form, and under the high-temperature roasting condition, clearance can reach more than 80%.
Therefore, if after stainless-steel cold-rolling heavy metal sewage sludge and unclassified stores mixing made ball, return blast furnace as pellet and use, be possible in theory as raw material.As long as rationally control pelletizing composition (Fe, P, S, F, Ni, Cr etc.) and metallurgical performance thereof (pellet strength, reductibility, reduction and pulverization ratio, ventilation property, softening and melt-dropping property etc.) can reach the materials requirement of blast furnace.So, not only helped reclaiming valuable elements such as Cr in the chromium-bearing sludge, Fe, Ni, Zn, Pb, CaO, thoroughly solve the secondary pollution problem that heavy metal causes, also can save high outer committee processing costs.
Summary of the invention
First aspect technical problem to be solved by this invention is to propose a kind of mud acid pellet, this mud acid pellet is one of main raw material with the stainless-steel cold-rolling heavy metal sewage sludge, provide the approach that utilizes of a harmless resource utilization to be reached for the stainless-steel cold-rolling heavy metal sewage sludge, and reclaim wherein valuable element, avoid the purpose of secondary pollution.
The present invention solves the problems of the technologies described above by the following technical programs, reaches purpose of the present invention.
The mud acid pellet is mainly formed by following raw materials by weight percent manufacturing:
Stainless-steel cold-rolling heavy metal sewage sludge 5～50%;
The smart powder 30～70% of iron;
Compound binding agent 2～8%;
Carbon dust 4～15%;
Moisture 10～30%.
Moisture content in the technical scheme of the present invention in the preferred stainless-steel cold-rolling heavy metal sewage sludge is less than 1%, and the main chemical compositions of the butt of described stainless-steel cold-rolling heavy metal sewage sludge and weight percent are: T.Fe:10～40%; Cr
2O
3: 0～10%; NiO:0～3%; CaO:15～45%; Al
2O
3: 1～5%; SiO
2: 0～10%; CaF
2: 5～20%; MgO:0～2%; Na
2O+K
2O:0～5%; S:0～5%; P≤0.1%.
Stainless-steel cold-rolling heavy metal sewage sludge in the technical scheme of the present invention is that mud is reclaimed in mixing sludge or classification.
The main component and the weight percent of the smart powder of preferred iron are in the technical scheme of the present invention: T.Fe 〉=65%; S≤0.05%.
Preferred compound binding agent is made up of in wilkinite, slaked lime, yellow soda ash, Xylo-Mucine, polyacrylamide, the modified starch one or more in the technical scheme of the present invention, and weight percent is as follows: wilkinite: 20～70%; Slaked lime (calcium hydroxide): 0～30%; Yellow soda ash: 0～20%; Xylo-Mucine: 0～20%; Polyacrylamide: 0～10%; Modified starch 0～10%.
The technical problem of second aspect to be solved by this invention is to propose the manufacture method of above-mentioned mud acid pellet.
The manufacture method of above-mentioned mud acid pellet may further comprise the steps:
(1) pre-treatment of raw material: with the stainless-steel cold-rolling heavy metal sewage sludge, the mummification grinding and sieving; The smart powder of iron is sieved;
(2) mixing of raw material: the smart powder of stainless-steel cold-rolling heavy metal sewage sludge, iron, carbon dust, compound binding agent and moisture are mixed, the addition manner of compound binding agent be water-soluble after, evenly allocate raw material in the mixing into spray pattern;
(3) system ball: green-ball (pellet) is made in the raw material extrusion molding that mixes;
(4) roasting: green-ball behind preliminarily dried, preheating, high-temperature roasting and naturally cooling, is obtained the mud acid pellet.
Preferably, in described step (1), described stainless-steel cold-rolling heavy metal sewage sludge sieves, will be more than 90wt% by the stainless-steel cold-rolling heavy metal sewage sludge particle of 60 μ m sieve apertures; The smart powder of described iron sieves, will be more than 90wt% by the smart powder particles of the iron of 60 μ m sieve apertures.
Preferably, in described step (3), described green-ball is spherical, and granularity is 10～15mm, and the pressure of extrusion molding is 3000～4000N.Certainly, in step (3), also the raw material extrusion molding that mixes can be made the green-ball of bar shaped or piece type.
Preferably, in described step (4), the temperature of described preliminarily dried is 100～120 ℃, and the time is 0.5～2h; The temperature of described preheating is 450～550 ℃, and the time is 10～30min; The temperature of described high-temperature roasting is 1100～1300 ℃, and the time is 0.5～2h; Described naturally cooling is to naturally cool to room temperature in stove.
The present invention is when utilizing the stainless-steel cold-rolling heavy metal sewage sludge, carry out mummification, pulverizing earlier, even with batch mixes such as the smart powder of iron, carbon dust, compound binding agent and moisture then, guaranteed the stability of mud acid pellet chemical ingredients, in processes such as system ball, drying, preheating, high temperature reduction roasting and naturally cooling, both guaranteed that mud acid pellet intensity can surpass removal of impurity such as 2000N/ is individual, S and can surpass 80%, that has guaranteed the mud acid pellet again goes into stove grade and excellent metallurgical performance, makes it can satisfy the batching requirement of blast furnace fully.Record by the experiment of many metallurgy performance test simulator, after the mud acid pellet enters blast furnace, valuable metal elements such as the Fe more than 80%, Cr, Ni will enter in the molten iron, inorganic elementss such as 90% Ca, Si will enter slag mutually in, ZnO, PbO, F, Na
2O, K
2Low melting points such as O advance volatilization in the blast furnace dust.
The mud acid pellet of the present invention's preparation, its chemical ingredients, physical and chemical performance and metallurgical performance all reach blast furnace and utilize requirement, performance index parameter and pellet are similar, after using with by suitable proportion with agglomerate, lump ore etc., can improve the blast furnace burden structure, help the technology direct motion, reduce raw materials cost.
Technology of the present invention is simple, in concrete enforcement, can utilize existing pellet production line, need not increase special equipment.
Therefore, the present invention provides a comparatively reasonably route of smelter internal recycling utilization for the stainless-steel cold-rolling heavy metal sewage sludge, can realize the innoxious and recycling of Hazardous wastes, reach the valuable element that both reclaims wherein, avoid the purpose of secondary pollution again.
Description of drawings
Fig. 1 is the schema of the manufacture method of mud acid pellet of the present invention.
Embodiment
Further specify technical scheme of the present invention with embodiment below.
This embodiment is with the stainless-steel cold-rolling heavy metal sewage sludge, as the raw material of making the mud acid pellet.The mud acid pellet is as blast furnace raw material.Specifically, as pellet, mud acid pellet and agglomerate, lump ore are used for blast-furnace smelting as blast furnace raw material jointly with the mud acid pellet, wherein the content of mud acid pellet is 10～40wt%.
The mud acid pellet is mainly formed by following raw materials by weight percent manufacturing:
Stainless-steel cold-rolling heavy metal sewage sludge 5～50%;
The smart powder 30～70% of iron;
Compound binding agent 2～8%;
Carbon dust 4～15%;
Moisture 10～30%.
The stainless-steel cold-rolling heavy metal sewage sludge is that mud is reclaimed in mixing sludge or classification.Moisture content is less than 1% in the stainless-steel cold-rolling heavy metal sewage sludge, and the main chemical compositions of the butt of stainless-steel cold-rolling heavy metal sewage sludge and weight percent are: T.Fe:10～40%; Cr
2O
3: 0～10%; NiO:0～3%; CaO:15～45%; Al
2O
3: 1～5%; SiO
2: 0～10%; CaF
2: 5～20%; MgO:0～2%; Na
2O+K
2O:0～5%; S:0～5%; P≤0.1%.
The main component and the weight percent of the smart powder of iron are: T.Fe 〉=65%; S≤0.05%.
Compound binding agent is made up of in wilkinite, slaked lime, yellow soda ash, Xylo-Mucine, polyacrylamide, the modified starch one or more, and weight percent is as follows: wilkinite: 20～70%; Slaked lime: 0～30%; Yellow soda ash: 0～20%; Xylo-Mucine (CMC-Na): 0～20%; Polyacrylamide (PAM): 0～10%; Modified starch 0～10%.Wilkinite is the calcium-base bentonite of Xinyang, Henan Province level bridge wilkinite factory; Modified starch is the hawk board rapid-curing cutback rubber powder available from Changzhou plum port starch company limited; Slaked lime, yellow soda ash, Xylo-Mucine, polyacrylamide etc. are industrial raw material, available from market.
Referring to Fig. 1.The manufacture method of mud acid pellet may further comprise the steps:
(1) pre-treatment of raw material: with the stainless-steel cold-rolling heavy metal sewage sludge, the mummification grinding and sieving will be more than 90wt% by the stainless-steel cold-rolling heavy metal sewage sludge particle of 60 μ m sieve apertures; The smart powder of iron is sieved, will be by the smart powder particles of the iron of 60 μ m sieve apertures more than 90wt%;
(2) mixing of raw material: the smart powder of stainless-steel cold-rolling heavy metal sewage sludge, iron, carbon dust, compound binding agent and moisture are mixed, the addition manner of compound binding agent be water-soluble after, evenly allocate raw material in the mixing into spray pattern; Be blended in the mixer and carry out, mixing time is 10～40min;
(3) system ball: the raw material that mixes is sent in roll squeezer or other pressing machinees extrusion molding make green-ball; Green-ball is spherical, and granularity is 10～15mm, and the pressure of extrusion molding is 3000～4000N; The combination of requirement each several part is firm, intensity is even;
(4) roasting: green-ball behind preliminarily dried, preheating, high-temperature roasting and naturally cooling, is obtained the mud acid pellet; The temperature of preliminarily dried is 100～120 ℃, and the time is 0.5～2h; The temperature of preheating is 450～550 ℃, and the time is 10～30min; The temperature of high-temperature roasting is 1100～1300 ℃, and the time is 0.5～2h; Naturally cooling is to naturally cool to room temperature in stove; Green-ball presents reductive atmosphere during high-temperature roasting under carbonaceous situation, under suitable maturing temperature and roasting time, the S impurity major part in the mud acid pellet can remove that (reaction equation is: 2CaSO
4+ C=2CaO+2SO
2+ CO
2).
Under above-mentioned embodiment, illustrate the present invention below.
Embodiment 1:
With the stainless-steel cold-rolling heavy metal sewage sludge after mummification, pulverizing, (account for the weight percent of the raw material gross weight of making the mud acid pellet according to heavy metal sewage sludge 25%, the proportioning of the smart powder 50% of iron, carbon dust 4%, compound binding agent 6%, moisture 15% down together),, mix the back and make green-ball, the one-tenth ball pressure is 3500N, and the pelletizing granularity is 15mm.
Wherein, the stainless-steel cold-rolling heavy metal sewage sludge is the heavy metal sewage sludge after the enrichment that produces in " chemical reduction+liquid caustic soda+milk of lime " two-step precipitation method, and the chemical ingredients of the butt of stainless-steel cold-rolling heavy metal sewage sludge and weight percent are: T.Fe:38.5%; Cr
2O
3: 3.5%; NiO:0.5%; CaO:35.5%; Al
2O
3: 3.8%; SiO
2: 5.4%; CaF
2: 5.9%; MgO:0.2%; Na
2O+K
2O:3.6%; S:2.5%; P＜0.1%; Surplus is an impurity.The detection foundation of aforementioned data: fluorine content adopts Fluoride ion selective electrode method (GB/T 6730.28-2006), sulphur content to adopt infrared absorption method (GB/T6730.61-2005), T.Fe content to take outside the potassium bichromate titrimetric method (GB 6730.5-1986), and all the other each compositions all adopt x ray fluorescence spectrometry (GB/T 6730.62-2005).
The prescription of compound binding agent: wilkinite 70% (accounting for the weight percent of compound binding agent gross weight, down together), slaked lime 10%, yellow soda ash 10%, PAM5%, CMC-Na0%, modified starch 5%.
Green-ball is naturally cooling behind 105 ℃ of preliminarily dried 2h, 550 ℃ of preheating 10min, 1300 ℃ of high-temperature roasting 0.5h, promptly obtains can be used as the mud acid pellet of one of blast furnace raw material.
By analysis, mud acid pellet T.Fe 〉=58% (detection foundation: GB/T 6730.5-1986), FeO≤1% (detection foundation: GB/T 6730.8-1986), S≤0.08% (detection foundation: GB/T6730.61-2005), ultimate compression strength 〉=2200N/ (detection foundation: GB/T 14201-1993), tumbler index (+6.3mm) 〉=90% (detect foundation: GB/T 8209-1987), wear-resistant index (0.5mm)＜8% (detects foundation: GB/T 8209-1987), screening index (5mm)＜5% (detects foundation: GB/T 10322.7-2004), reduction degree index RI 〉=90% (the detection foundation: GB/T 13241-1991), reduction swellability rate RSI＜20% (detection foundation: GB/T13240-1991).
(account for the weight percent of blast furnace raw material gross weight with 10%, mud acid pellet down together), 80% agglomerate and 10% lump ore, after the analog blast furnace raw material mix mixes, recording pelletizing drippage temperature is 1508 ℃, between melting zone be 111 ℃, maximum differential pressure is 3103Pa, and (detect foundation: GB/T 5989-1986) softening and molten drop satisfies the requirement of blast-furnace smelting fully, explanation with addition of in raw material, can guarantee the blast furnace normal running with chromium-bearing sludge.
Embodiment 2:
With the stainless-steel cold-rolling heavy metal sewage sludge after mummification, pulverizing, (account for the weight percent of the gross weight of the raw material of making the mud acid pellet according to heavy metal sewage sludge 50%, the proportioning of the smart powder 30% of iron, carbon dust 5%, compound binding agent 2%, moisture 13% down together),, mix the back and make green-ball, the one-tenth ball pressure is 3000N, and the pelletizing granularity is 12.5mm.
Wherein, the stainless-steel cold-rolling heavy metal sewage sludge is the heavy metal sewage sludge after the enrichment that produces of " chemical reduction+liquid caustic soda+milk of lime " two-step precipitation method, and the chemical ingredients of the butt of stainless-steel cold-rolling heavy metal sewage sludge and weight percent thereof are: T.Fe:39.8%; Cr
2O
3: 4.9%; NiO:1.0%; CaO:29.5%; Al
2O
3: 2.4%; SiO
2: 3.5%; CaF
2: 11.9%; MgO:0.1%; Na
2O+K
2O:4.6%; S:1.5%; P＜0.1%; Surplus is an impurity.
The prescription of compound binding agent: wilkinite 20% (accounting for the weight percent of the gross weight of compound binding agent, down together), slaked lime 30%, yellow soda ash 20%, PAM15%, CMC-Na5%, modified starch 10%.
Green-ball is naturally cooling behind 120 ℃ of preliminarily dried 0.5h, 450 ℃ of preheating 30min, 1180 ℃ of high-temperature roasting 1h, promptly obtains can be used as one of blast furnace raw material mud acid pellet.
By analysis, mud acid pellet T.Fe 〉=52%, FeO≤1%, S≤0.08%, ultimate compression strength 〉=2200N/, tumbler index (+6.3mm) 〉=90%, wear-resistant index is (0.5mm)＜8%, screening index (5mm)＜5%, reduction degree index RI 〉=90%, reduction swellability rate RSI＜20%.
(account for the weight percent of blast furnace raw material gross weight with 40%, mud acid pellet down together), 50% agglomerate and 10% lump ore, after the analog blast furnace raw material mix mixes, recording pelletizing drippage temperature is 1408 ℃, between melting zone be 120 ℃, maximum differential pressure is 2810Pa, and softening and molten drop satisfies the requirement of blast-furnace smelting fully, explanation will contain the stainless-steel cold-rolling heavy metal sewage sludge of chromium with addition of in raw material, can guarantee the blast furnace normal running.
The detection foundation of the data in the present embodiment is with embodiment 1.
Embodiment 3:
With the stainless-steel cold-rolling heavy metal sewage sludge after mummification, pulverizing, proportioning according to heavy metal sewage sludge 5% (weight percent, down together), the smart powder 60% of iron, carbon dust 15%, compound binding agent 8%, moisture 12% mixes the back and makes green-ball, the one-tenth ball pressure is 4000N, and the pelletizing granularity is 15mm.
Wherein, the stainless-steel cold-rolling heavy metal sewage sludge is the mixing sludge that one step of the milk of lime precipitator method produce, and the chemical ingredients of the butt of stainless-steel cold-rolling heavy metal sewage sludge and weight percent thereof are: T.Fe:12.5%; Cr
2O
3: 2.9%; NiO:0.4%; CaO:44.5%; Al
2O
3: 4.4%; SiO
2: 5.2%; CaF
2: 17.9%; MgO:0.4%; Na
2O+K
2O:4.5%; S:4.8%; P:0.1%; Surplus is an impurity.
The prescription of compound binding agent: wilkinite 50% (weight percent, down together), slaked lime 15%, yellow soda ash 5%, PAM10%, CMC-Na10%, modified starch 10%.
Green-ball is naturally cooling behind 100 ℃ of preliminarily dried 2h, 500 ℃ of preheating 30min, 1100 ℃ of high-temperature roasting 2h, promptly obtains can be used as the mud acid pellet of one of blast furnace raw material.
By analysis, mud acid pellet T.Fe 〉=60%, FeO≤1%, S≤0.08%, ultimate compression strength 〉=2200N/, tumbler index (+6.3mm) 〉=90%, wear-resistant index is (0.5mm)＜8%, screening index (5mm)＜5%, reduction degree index RI 〉=90%, reduction swellability rate RSI＜20%.
(account for the weight percent of blast furnace raw material gross weight with 20%, mud acid pellet down together), 60% agglomerate and 20% lump ore, after the analog blast furnace raw material mix mixes, recording pelletizing drippage temperature is 1455 ℃, between melting zone be 115 ℃, maximum differential pressure is 2610Pa, and softening and molten drop satisfies the requirement of blast-furnace smelting fully, explanation with addition of in raw material, can guarantee the blast furnace normal running with chromium-bearing sludge.
The detection foundation of the data in the present embodiment is with embodiment 1.
Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in claims scope of the present invention variation, the modification of the above embodiment.
Claims (8)
1. a mud acid pellet is characterized in that, is mainly formed by following raw materials by weight percent manufacturing:
Stainless-steel cold-rolling heavy metal sewage sludge 5～50%;
The smart powder 30～70% of iron;
Compound binding agent 2～8%;
Carbon dust 4～15%;
Moisture 10～30%.
2. mud acid pellet according to claim 1, it is characterized in that, moisture content is less than 1% in the described stainless-steel cold-rolling heavy metal sewage sludge, and the main chemical compositions of the butt of described stainless-steel cold-rolling heavy metal sewage sludge and weight percent are: T.Fe:10～40%; Cr
2O
3: 0～10%; NiO:0～3%; CaO:15～45%; Al
2O
3: 1～5%; SiO
2: 0～10%; CaF
2: 5～20%; MgO:0～2%; Na
2O+K
2O:0～5%; S:0～5%; P≤0.1%.
3. mud acid pellet according to claim 1 is characterized in that, described stainless-steel cold-rolling heavy metal sewage sludge is that mud is reclaimed in mixing sludge or classification.
4. mud acid pellet according to claim 1 is characterized in that, the main component and the weight percent of the smart powder of described iron are: T.Fe 〉=65%; S≤0.05%.
5. mud acid pellet according to claim 1, it is characterized in that, described compound binding agent is by several composition the in wilkinite, slaked lime, yellow soda ash, Xylo-Mucine, polyacrylamide, the modified starch, and weight percent is as follows: wilkinite: 20～70%; Slaked lime: 0～30%; Yellow soda ash: 0～20%; Xylo-Mucine: 0～20%; Polyacrylamide: 0～10%; Modified starch 0～10%.
6. the manufacture method of a mud acid pellet is characterized in that, described mud acid pellet is mainly formed by following raw materials by weight percent manufacturing: stainless-steel cold-rolling heavy metal sewage sludge 5～50%; The smart powder 30～70% of iron; Compound binding agent 2～8%; Carbon dust 4～15%; Moisture 10～30%; Described manufacture method may further comprise the steps:
(1) pre-treatment of raw material: with the stainless-steel cold-rolling heavy metal sewage sludge, the mummification grinding and sieving; The smart powder of iron is sieved;
(2) mixing of raw material: the smart powder of stainless-steel cold-rolling heavy metal sewage sludge, iron, carbon dust, compound binding agent and moisture are mixed, the addition manner of compound binding agent be water-soluble after, evenly allocate raw material in the mixing into spray pattern;
(3) system ball: green-ball is made in the raw material extrusion molding that mixes;
(4) roasting: green-ball behind preliminarily dried, preheating, high-temperature roasting and naturally cooling, is obtained the mud acid pellet, and the temperature of described preliminarily dried is 100～120 ℃, and the time is 0.5～2h; The temperature of described preheating is 450～550 ℃, and the time is 10～30min; The temperature of described high-temperature roasting is 1100～1300 ℃, and the time is 0.5～2h; Described naturally cooling is to naturally cool to room temperature in stove.
7. the manufacture method of mud acid pellet according to claim 6 is characterized in that: in described step (1), described stainless-steel cold-rolling heavy metal sewage sludge sieves, will be more than 90wt% by the stainless-steel cold-rolling heavy metal sewage sludge particle of 60 μ m sieve apertures; The smart powder of described iron sieves, will be more than 90wt% by the smart powder particles of the iron of 60 μ m sieve apertures.
8. the manufacture method of mud acid pellet according to claim 6 is characterized in that: in described step (3), described green-ball is spherical, and granularity is 10～15mm, and the pressure of extrusion molding is 3000～4000N.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100461331A CN101805827B (en) | 2009-02-12 | 2009-02-12 | Sludge oxidized pellet and its preparation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100461331A CN101805827B (en) | 2009-02-12 | 2009-02-12 | Sludge oxidized pellet and its preparation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101805827A CN101805827A (en) | 2010-08-18 |
| CN101805827B true CN101805827B (en) | 2011-12-21 |
Family
ID=42607782
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100461331A Active CN101805827B (en) | 2009-02-12 | 2009-02-12 | Sludge oxidized pellet and its preparation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101805827B (en) |
Families Citing this family (36)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102121065B (en) * | 2010-12-14 | 2012-11-14 | 张瑞瑜 | Mineral powder moulding binder |
| CN102690956A (en) * | 2012-06-18 | 2012-09-26 | 北京科技大学 | Method for green extraction of chromium and nickel from stainless steel pickled sludge |
| CN103074485B (en) * | 2013-02-06 | 2015-03-04 | 武汉科技大学 | Preparation method of oxidized pellets with coarse-grain hematite as main raw material |
| CN104073632B (en) * | 2013-03-27 | 2017-08-11 | 鞍钢股份有限公司 | A kind of steel rolling greasy filth makees blast furnace acid pellet of binding agent and preparation method thereof |
| CN103194595A (en) * | 2013-04-06 | 2013-07-10 | 江西理工大学 | Composite type fluorite pelletizing adhesive |
| CN103305703A (en) * | 2013-06-30 | 2013-09-18 | 金川集团股份有限公司 | Using method of granulation binder for chloride-leaching incineration residue |
| CN103409619B (en) * | 2013-07-29 | 2015-10-28 | 鄂州飞亚利废有限责任公司 | Cooled agglomerated pellet and preparation method thereof |
| CN103408235A (en) * | 2013-08-19 | 2013-11-27 | 闵敏 | Powder forming adhesive |
| CN104060092A (en) * | 2013-09-24 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Biochemical sludge processing method |
| CN104512988A (en) * | 2013-09-29 | 2015-04-15 | 宝山钢铁股份有限公司 | Method for treating heavy metal sludge by using stainless steel molten slag |
| CN103710537A (en) * | 2013-12-18 | 2014-04-09 | 闵敏 | High-strength adhesive for powder cold press molding |
| CN103725878A (en) * | 2014-01-10 | 2014-04-16 | 王洪 | Method for comprehensively utilizing residual tailings after extracting precious metals from acid pickling sludge |
| CN103820638A (en) * | 2014-02-26 | 2014-05-28 | 廊坊紫光化工建材有限公司 | Pellet binder |
| CN104004906A (en) * | 2014-03-12 | 2014-08-27 | 北京宇航同辉能源科技有限公司 | Pellet additive and preparation method thereof |
| CN105271624B (en) * | 2014-05-29 | 2018-03-09 | 宝山钢铁股份有限公司 | A kind of method of cooperative disposal heavy metal sewage sludge |
| CN107208174A (en) * | 2014-11-10 | 2017-09-26 | 凯米罗总公司 | Adhesive composition and the method for preparing iron ore spherolite |
| CN104923545B (en) * | 2015-06-10 | 2017-10-17 | 山东迈尔医疗科技有限公司 | The handling process of discarded metal powder produced by a kind of 3D metallic prints machine |
| CN105018826B (en) * | 2015-07-24 | 2017-02-01 | 金川集团股份有限公司 | Method for increasing direct recovery rate of nickel protoxide added in stainless steel smelting |
| CN106929625A (en) * | 2015-12-29 | 2017-07-07 | 林士凯 | The sludge that steel mill is produced is reclaimed and is made as the method that steel mill produces auxiliary material again |
| CN105541065A (en) * | 2016-01-21 | 2016-05-04 | 昆明理工大学 | High-temperature melting and solidifying method for heavy metal sludge |
| CN106086399A (en) * | 2016-07-21 | 2016-11-09 | 北京神雾环境能源科技集团股份有限公司 | A kind of copper ashes carbonaceous pelletizing molding compound binding agent |
| CN106148685A (en) * | 2016-07-28 | 2016-11-23 | 重庆大学 | A kind of municipal sludge and iron-containing waste prepare the method for acid pellet |
| CN106755981B (en) * | 2016-11-25 | 2019-07-19 | 江苏省沙钢钢铁研究院有限公司 | A method of metallized pellet is produced using iron ore mine |
| CN106435164A (en) * | 2016-12-01 | 2017-02-22 | 湘潭瑞通球团有限公司 | Iron-contained waste treatment method and equipment adopting same |
| CN106906357A (en) * | 2017-03-21 | 2017-06-30 | 江苏省冶金设计院有限公司 | The method for preparing bloodstone acid pellet |
| CN107721291A (en) * | 2017-11-27 | 2018-02-23 | 保定市胜辉聚合物科技有限公司 | Processing Industrial Solid Waste with exempt from drying binding agent |
| CN108218025A (en) * | 2017-12-06 | 2018-06-29 | 宜兴市馨德环保科技有限公司 | The method that the nitration mixture Sewage treatment that a kind of pickling of metal generates utilizes |
| CN110016376B (en) * | 2018-01-09 | 2020-12-22 | 宝山钢铁股份有限公司 | Utilization method of cold rolling magnetic filtration waste |
| CN108672714A (en) * | 2018-04-24 | 2018-10-19 | 上海大学 | The method that alloy powder is directly prepared by cold rolling sludge |
| CN109112297B (en) * | 2018-10-19 | 2020-08-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Binder for forming converter enriched sludge and converter enriched sludge forming method |
| CN109371234B (en) * | 2018-12-18 | 2020-09-01 | 安徽工业大学 | Pellet binder with desulfurization function and preparation method and application thereof |
| CN109929995B (en) * | 2019-03-29 | 2020-08-07 | 信阳市上天梯怡和矿产资源开发有限公司 | Aluminum ash pellet binder and preparation method thereof |
| CN109881000B (en) * | 2019-04-10 | 2021-06-01 | 华北理工大学 | Double-layer composite pellet for treating copper slag and preparation method thereof |
| CN110055412A (en) * | 2019-04-28 | 2019-07-26 | 广东飞南资源利用股份有限公司 | A kind of method of cupric tin electroplating sludge and desulfurized gesso of flue gas slag cooperative disposal and synthetical recovery copper and tin |
| CN110592373A (en) * | 2019-10-21 | 2019-12-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Binder for forming enriched sludge of converter with high CaO content and preparation method of pellets of binder |
| CN114763582B (en) * | 2021-01-15 | 2023-09-12 | 宝山钢铁股份有限公司 | Method for producing magnesium pellets by using oriented silicon steel magnesia waste |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1313407A (en) * | 2001-01-10 | 2001-09-19 | 上海大学 | Process for preparing Cr-contained sintered ore of blast furnace from powdered chromium ore and Fe-contained raw material |
| CN1696064A (en) * | 2004-05-14 | 2005-11-16 | 高志远 | Method for producing chromic oxide by using sludge of containing chrome |
| CN101255493A (en) * | 2008-03-12 | 2008-09-03 | 中南大学 | Direct reclaiming method for metals in smelting dust |
-
2009
- 2009-02-12 CN CN2009100461331A patent/CN101805827B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1313407A (en) * | 2001-01-10 | 2001-09-19 | 上海大学 | Process for preparing Cr-contained sintered ore of blast furnace from powdered chromium ore and Fe-contained raw material |
| CN1696064A (en) * | 2004-05-14 | 2005-11-16 | 高志远 | Method for producing chromic oxide by using sludge of containing chrome |
| CN101255493A (en) * | 2008-03-12 | 2008-09-03 | 中南大学 | Direct reclaiming method for metals in smelting dust |
Non-Patent Citations (2)
| Title |
|---|
| JP特开昭52-52176A 1977.04.26 |
| 石磊等.含铬污泥球团在钢铁工业中的应用前景.《再生资源研究》.2007,(第1期),第33-36页. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101805827A (en) | 2010-08-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101805827B (en) | Sludge oxidized pellet and its preparation method | |
| CN104046773B (en) | A kind of dedusting steel-smelting converter ash produces cooled agglomerated pellet processing method | |
| KR101903438B1 (en) | Non-roasting Pellet Composition Prepared By Using Melted Iron slags and Melted Iron Process By-products, and Pellet Preparation Method | |
| CN101353708B (en) | Nickel iron smelting process with nickel oxide ore and stainless steel production wastes as raw materials | |
| CN105271624B (en) | A kind of method of cooperative disposal heavy metal sewage sludge | |
| CN110317951A (en) | A method of nichrome is produced using dedusting ash of stainless steel and pickling sludge | |
| CN102925675B (en) | Method for recovering sludge from smelting ironmaking | |
| CN110016551A (en) | Cold rolling sludge converter resource utilization method | |
| CN105219907A (en) | The iron-smelting process of high-phosphor oolitic hematite gas base directly reducing-mill ore magnetic selection | |
| CN112063834B (en) | Method for returning stainless steel pickling sludge to rotary kiln-submerged arc furnace process for utilization | |
| CN106480310A (en) | A kind of alkali-metal method in removing metallurgical dust sludge | |
| CN101560583A (en) | Rotary furnace cooling agent made of metallurgical waste material product and using method thereof | |
| CN110669935A (en) | Process for multi-component separation and tailing quenching and tempering utilization of red mud | |
| CN1718554A (en) | Treatment method of vanadium containing converter steel slag | |
| CN105861845A (en) | Method for combined treatment of copper slags and steel slags | |
| CN110093471A (en) | A kind of efficient low-consume red mud method of comprehensive utilization | |
| CN113604660A (en) | Dedusting ash micronized recycling process method | |
| CN114164346A (en) | Method for synergistically recovering valuable metals in chromium-containing waste residues and carbon-containing waste materials | |
| CN103215437A (en) | Method for producing beaded iron by using nickel slag, blast furnace gas ash and steel OG mud | |
| CN102851512B (en) | Method for producing iron alloy through vanadium extraction tailing reduction smelting | |
| CN115716738B (en) | Production process of high-strength steel slag brick | |
| CN101560581A (en) | Rotary furnace cooling agent and manufacturing method thereof | |
| CN106480309A (en) | A kind of removing alkali metal treated sludge pellet and preparation method thereof | |
| CN105274329A (en) | Pellet manufactured through multiple metal smelting waste and preparing method of pellet | |
| CN104962685A (en) | Vanadium extraction cooling agent and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |