CN101693950B - Double-polymer iron ore pellet organic binder and method for using same - Google Patents
Double-polymer iron ore pellet organic binder and method for using same Download PDFInfo
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- CN101693950B CN101693950B CN200910309383XA CN200910309383A CN101693950B CN 101693950 B CN101693950 B CN 101693950B CN 200910309383X A CN200910309383X A CN 200910309383XA CN 200910309383 A CN200910309383 A CN 200910309383A CN 101693950 B CN101693950 B CN 101693950B
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Abstract
The invention discloses double-polymer iron ore pellet organic binder and a method for using the double-polymer iron ore pellet organic binder. The binder is made from natrium humate, fulvic acid-Na and borax, and comprises, by weight percent, 60 to 80 percent of natrium humate, 10 to 35 percent of fulvic acid-Na and 5 to 10 percent of borax. The method for using the double-polymer iron ore pellet organic binder comprises adding the binder prepared according to the mass fraction into iron ore concentrate in which the size fraction of -0.074mm is not less than 70 percent by weight percent, blending and fabricating pellets, and the consumption quantity of the organic binder is equal to 0.5 to 1.2 percent of the iron ore concentrate by weight percent. The invention develops the polymer organic binder for preparing oxide pellets on basis of the molecular structure theory of the pellet binder. The organic binder has the advantages of small consumption quantity, low price and less residual quantity. Compared with inorganic binder bentonite, the invention can obviously increase the TFe grade of finished pellets, and solves the problems that green pellets prepared by organic binder has poor heat stability, pre-heated pellets have low strength and the like.
Description
Technical field
The present invention relates to a kind of double-polymer iron ore pellet organic binder and using method thereof.These binding agent raw material sources are wide, low production cost; Usage quantity is few, and residual quantity is low; The green-ball thermostability be can improve, preheating, finished ball nodulizing intensity improved.
Background technology
The iron ore acid pellet has the excellent metallurgical performance and improves advantages such as blast furnace permeability of stock column, is considered to realize the necessary high-quality furnace charge of blast furnace burden composition optimizes.In recent years, domestic each big steel enterprise is all in the acid pellet production technique of greatly developing based on chain grate machine-rotary kiln.
Binding agent is the indispensable raw material of preparation iron ore pellets.Select the fundamental principle of pellet binder: (1) will have good cohesiveness and balling-up; (2) Zhi Bei green-ball should have good heat resistanceheat resistant explosion performance, has higher compression and dropping strength simultaneously; (3) binding agent does not influence the iron grade of finished ball nodulizing as far as possible.At present, domestic and international most pelletizing plants all adopt wilkinite to make binding agent, and its consumption is generally 2%～3%, and high person reaches 5%.Production practice prove that the wilkinite of the overwhelming majority still remained in the finished ball nodulizing after roasting was finished, and have reduced finished ball nodulizing TFe grade (wilkinite of every interpolation 1%, pellet iron grade reduces by 0.6%～0.7%).In recent years, enterprises such as domestic Laigang, Ji steel, Anshan iron and steel plant bring into use by wilkinite and organic component mixes the composite bentonite that constitutes, and its consumption can be reduced to 1%～2%.Existing simultaneously multidigit investigator has applied for the related invention patent at the research of pelletizing composite bentonite, as " a kind of bonding agent for iron ore pellet and preparation method thereof " (ZL 200710304318.9), " composite globular mineral binder and processing method thereof " (CN 1229144), " a kind of powdered iron ore prepares the binding agent of iron powder ball and the iron powder of preparation thereof " (ZL 200510134759.X) etc.Yet still based on inorganic bentonite or calcium magnesium silicate, its residual quantity in the product pellet is still higher for such compound binding agent main ingredient.
It is more that organic binder bond is used to prepare oxide pellet application abroad, such as: the pendant benefit (Peridur) that A Ketai (Alcotac) FE series that Switzerland's vapour crust (Ciba) of mentioning in document " ALCOTACFE series pellet binder is made ball test(ing) ", " application of organic binder bond in iron ore pellets and steel-making " is produced and Dutch Akzo Nobel (Akzo Nobel) company produce has been used for pellet formation.Yet, the belt sinter process is mainly taked in external acid pellet production, its abrasive wear resistance to pellet in the warm does not have particular requirement, China's acid pellet production technique is then based on chain grate machine-rotary kiln technology, the preheating pellet strength is had relatively high expectations, and general requirement ultimate compression strength is greater than 400N/, and the AC rotary drum is less than 5%, otherwise in rotary kiln, easily produce powder, cause " ring formation ".A large amount of laboratories and industrial experiment result show, the preheating pelletizing and the roasting pellet strength of A Ketai (Alcotac) FE, pendant benefit pure organic binder bonds such as (Peridur) are difficult to satisfy chain grate machine-rotary kiln manufacturing technique requirent, thereby fail all the time to obtain to use in China.
The organic binder bond that domestic acid pellet prepares usefulness also has much, such as: the sodium starch glycolate that document " sodium starch glycolate improves the mechanism of pellet strength " is mentioned, modified-cellulose in the document " organic binder bond substitutes wilkinite and prepares acid pellet ", polyacrylamide in the document " research of synthetic organic polymer binding agent in the magnet fine mineral powder agglomeration ", the humic acids that " research of extraction process parameter in the HA series pellet binder preparation process " and patent " Cheap highly effective binder of a kind of pellet ore and preparation method thereof " (CN 101230416A) relate to, sodium alginate etc.But because the production cost of the complicacy of iron ore concentrate character and binding agent is higher, and these organic binder bonds are adopting the green-ball poor heat stability that chain grate machine-rotary kiln technology exists when producing pelletizing, problems such as preheating pelletizing and roasting pellet strength difference, these pure organic binder bonds do not obtain practical application yet in pellet formation.
Along with the proposition of China's blast furnace " fine fodder " policy with based on the greatly developing of the pellet formation of chain grate machine-rotary kiln production technique, development of new high-quality, cheapness, organic binder bond efficient, Heat stability is good are trends of the times.Natrium humate, SODLUM FULVATE can be extracted from low grade coal (comprising the peat composed of rotten mosses, weathered coal, brown coal) and agricultural waste material raw materials such as (wheat straw, straw, maize straw, beanstalks).Domestic investigator extracts with utilization it and studies, as " a kind of method of comprehensive utilization of brown coal " (ZL 00132064.5), " black corrosion inhibiting scale retarding agent " (ZL02109352.0), " method of preparing humic acid by aerating stalks " (ZL 99119641.4), " a kind of preparation method of high-purity medical xanthonumic acid " (CN 101033231A), " preparation method of peatyfulvic acid somatotropic harmone of plant " (ZL 98117372.1), " regenerated xanthohumic acid and production method thereof " (ZL 95101570.2), " a kind of preparation method of agricultural xanthohumic acid " (CN1456539), " biochemistry fulvic acid water-loss reducer and preparation method thereof " (CN 101215207), " the efficient preparation method of biochemical fulvic acid " (CN 1706880) and document " constitutional features of humic acid and absorption behavior thereof " etc.
Summary of the invention
It is low, cheap that first technical problem to be solved by this invention provides a kind of consumption, the double-polymer iron ore pellet organic binder that residual quantity is little.
Second technical problem to be solved by this invention provides a kind of using method of this double-polymer iron ore pellet organic binder.
In order to solve first technical problem, the double-polymer iron ore pellet organic binder that provides of the present invention, form by natrium humate, SODLUM FULVATE and borax, wherein the mass percent of natrium humate is 60%～80%, the mass percent of SODLUM FULVATE is 10%～35%, and the mass percent of borax is 5%～10%.
The pH of described natrium humate is 9～10, and its granularity is for being not more than 0.074mm.
The pH of described SODLUM FULVATE is 9～10, and its granularity is for being not more than 0.074mm.
In order to solve second technical problem, the method of use double-polymer iron ore pellet organic binder provided by the invention, binding agent is by natrium humate, SODLUM FULVATE and borax are formed, wherein the mass percent of natrium humate is 60%～80%, the mass percent of SODLUM FULVATE is 35%-10%, 5%～10% of the mass percent of borax, during use, to be not less than in the iron ore concentrate of 70% (mass percent) by the formulated organic binder bond adding-0.074mm grade of above-mentioned mass percent, mixing, make ball, the consumption of organic binder bond accounts for iron ore concentrate 0.5%～1.2% mass percent.
Adopt the double-polymer iron ore pellet organic binder and the using method thereof of technique scheme, based on pellet binder molecular structure theory, it is that 0.5%～1.2% product of the present invention is the adhesive preparation pelletizing that employing accounts for the iron ore concentrate mass percent, with compare with addition of the pelletizing of 3% natural montmorillonite, 2% composite bentonite respectively, three's green-ball thermal spalling temperature and pre-hot-bulb resistance to compression, abrasive wear resistance are suitable substantially; With compare with addition of 0.3% pendant benefit pelletizing, the thermal spalling temperature of green-ball improves, pre-hot-bulb resistance to compression and abrasive wear resistance are obviously improved.The green pellets of employing the present invention preparation, pre-hot-bulb and roasting ball quality all satisfy the extensively requirement of the chain grate machine-rotary kiln of employing, shaft furnace, belt type roasting machine production technique in the acid pellet production, and finished ball nodulizing iron grade improves more than 1% than the pellet that adopts wilkinite to prepare.This organic binder bond consumption is low, cheap, and residual quantity is little.Compare with the mineral binder bond wilkinite, can obviously improve the TFe grade of finished ball nodulizing, and solve to use problems such as the green-ball poor heat stability of organic binder bond preparation, pre-hot-bulb intensity are low.
Embodiment
The invention will be further described below in conjunction with specific embodiment.
[reference examples]
Reference examples 1: general-0.074mm grade is not less than the iron ore concentrate of 70% (mass percent) and prepares burden with the natural montmorillonite that accounts for iron ore concentrate mass percent 3.0%, mixes, and makes ball.The shatter strength of green pellet of preparation is 7.0 times/0.5m, and ultimate compression strength is 10.1N/, and cracking temperature of green pellet is 580.Under preheating temperature 950, warm up time 10min, maturing temperature 1280, roasting time 10min condition, the pre-hot-bulb ultimate compression strength of acquisition is 577N/, and the AC rotary drum is 3.43%; Roasting pelletizing ultimate compression strength is 3577N/, and barrate strength is 97.1%, and abrasion resistance index is 2.1%, and the TFe of roasting pelletizing is 57.61%.
Reference examples 2: general-0.074mm grade is not less than the iron ore concentrate of 70% (mass percent) and prepares burden with the composite bentonite that accounts for iron ore concentrate mass percent 2.0%, mixes, and makes ball.The shatter strength of green pellet of preparation is 6.7 times/0.5m, and ultimate compression strength is 9.8N/, and cracking temperature of green pellet is 530.Under preheating temperature 950, warm up time 10min, maturing temperature 1280, roasting time 10min condition, the pre-hot-bulb ultimate compression strength of acquisition is 544N/, and the AC rotary drum is 4.28%; Roasting pelletizing ultimate compression strength is 3541N/, and barrate strength is 96.8%, and abrasion resistance index is 2.3%, and the TFe of roasting pelletizing is 58.23%.
Reference examples 3: the pendant benefit that general-0.074mm grade is not less than 70% iron ore concentrate (mass percent) and accounts for iron ore concentrate mass percent 0.3% is prepared burden, and mixes, and makes ball.The shatter strength of green pellet of preparation is 13.2 times/0.5m, and ultimate compression strength is 8.1N/, and cracking temperature of green pellet is 390.Under preheating temperature 950, warm up time 10min, maturing temperature 1280, roasting time 10min condition, the pre-hot-bulb ultimate compression strength of acquisition is 348N/, and the AC rotary drum is 7.71%; Roasting pelletizing ultimate compression strength is 3223N/, and barrate strength is 95.6%, and abrasion resistance index is 3.9%, and the TFe of roasting pelletizing is 59.32%.
[specific embodiment]
Embodiment 1:
The mass percent of natrium humate is 60%, and the mass percent of SODLUM FULVATE is 35%, and the mass percent of borax is 5%, and the pH of natrium humate is 9, and its granularity is for being not more than 0.074mm, and the pH of SODLUM FULVATE is 9, and its granularity is for being not more than 0.074mm.
General-0.074mm grade is not less than the iron ore concentrate of 70% (mass percent) and prepares burden with the product of the present invention that accounts for iron ore concentrate mass percent 0.5%, mixes, and makes ball.The shatter strength of green pellet of preparation is 9.0 times/0.5m, and ultimate compression strength is 11.0N/, and cracking temperature of green pellet is 570.Under preheating temperature 950, warm up time 10min, maturing temperature 1280, roasting time 10min condition, the pre-hot-bulb ultimate compression strength of acquisition is 538N/, and the AC rotary drum is 4.31%; Roasting pelletizing ultimate compression strength is 3483N/, and barrate strength is 96.3%, and abrasion resistance index is 2.4%, and the TFe of roasting pelletizing is 59.31%.
Embodiment 2:
The mass percent of natrium humate is 80%, and the mass percent of SODLUM FULVATE is 10%, and the mass percent of borax is 10%, and the pH of natrium humate is 9, and its granularity is for being not more than 0.074mm, and the pH of SODLUM FULVATE is 9, and its granularity is for being not more than 0.074mm.
General-0.074mm grade is not less than the iron ore concentrate of 70% (mass percent) and accounts for iron ore concentrate mass percent 1.0% product of the present invention and prepares burden, and mixes, and makes ball.The shatter strength of green pellet of preparation is 14.2 times/0.5m, and ultimate compression strength is 11.5N/, and cracking temperature of green pellet is 561 ℃.Under preheating temperature 950, warm up time 10min, maturing temperature 1280, roasting time 10min condition, the pre-hot-bulb ultimate compression strength of acquisition is 525N/, and the AC rotary drum is 4.37%; Roasting pelletizing ultimate compression strength is 3353N/, and barrate strength is 96.2%, and abrasion resistance index is 2.6%, and the TFe of roasting pelletizing is 59.27%.
Embodiment 3:
The mass percent of natrium humate is 70%, and the mass percent of SODLUM FULVATE is 20%, and the mass percent of borax is 10%, and the pH of natrium humate is 10, and its granularity is for being not more than 0.074mm, and the pH of SODLUM FULVATE is 10, and its granularity is for being not more than 0.074mm.
General-0.074mm grade is not less than the iron ore concentrate of 70% (mass percent) and accounts for iron ore concentrate mass percent 1.2% product of the present invention and prepares burden, and mixes, and makes ball.The shatter strength of green pellet of preparation is 16.2 times/0.5m, and ultimate compression strength is 11.9N/, and cracking temperature of green pellet is 545 ℃.Under 950 ℃ of preheating temperatures, warm up time 10min, 1280 ℃ of maturing temperatures, roasting time 10min condition, the pre-hot-bulb ultimate compression strength of acquisition is 520N/, and the AC rotary drum is 4.41%; Roasting pelletizing ultimate compression strength is 3305N/, and barrate strength is 96.2%, and abrasion resistance index is 2.7%, and the TFe of roasting pelletizing is 59.24%.
Embodiment 4:
The mass percent of natrium humate is 75%, and the mass percent of SODLUM FULVATE is 17%, and the mass percent of borax is 8%, and the pH of natrium humate is 10, and its granularity is for being not more than 0.074mm, and the pH of SODLUM FULVATE is 10, and its granularity is for being not more than 0.074mm.
General-0.074mm grade is not less than the iron ore concentrate of 70% (mass percent) and accounts for iron ore concentrate mass percent 0.75% product of the present invention and 0.25% natural montmorillonite is prepared burden, and mixes, and makes ball.The shatter strength of green pellet of preparation is 15 times/0.5m, and ultimate compression strength is 10.8N/, and cracking temperature of green pellet is 581 ℃.Under 950 ℃ of preheating temperatures, warm up time 10min, 1280 ℃ of maturing temperatures, roasting time 10min condition, the pre-hot-bulb ultimate compression strength of acquisition is 535N/, and the AC rotary drum is 4.05%; Roasting pelletizing ultimate compression strength is 3461N/, and barrate strength is 96.5%, and abrasion resistance index is 2.6%, and the TFe of roasting pelletizing is 59.20%.
Claims (4)
1. double-polymer iron ore pellet organic binder, it is characterized in that: form by natrium humate, SODLUM FULVATE and borax, wherein the mass percent of natrium humate is 60%～80%, and the mass percent of SODLUM FULVATE is 10%～35%, and the mass percent of borax is 5%～10%.
2. double-polymer iron ore pellet organic binder according to claim 1 is characterized in that: the pH of described natrium humate is 9～10, and its granularity is for being not more than 0.074mm.
3. double-polymer iron ore pellet organic binder according to claim 1 is characterized in that: the pH of described SODLUM FULVATE is 9～10, and its granularity is for being not more than 0.074mm.
4. use the method for the described double-polymer iron ore pellet organic binder of claim 1, it is characterized in that: binding agent is made up of natrium humate, SODLUM FULVATE and borax, wherein the mass percent of natrium humate is 60%～80%, the mass percent of SODLUM FULVATE is 35%～10%, 5%～10% of the mass percent of borax; During use, will be not less than in the iron ore concentrate of mass percent 70% by the formulated organic binder bond adding-0.074mm grade of above-mentioned mass percent, and mixing, make ball, the consumption of organic binder bond accounts for iron ore concentrate 0.5%～1.2% mass percent.
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Application publication date: 20100414 Assignee: Panzhihua Gangcheng Group Co.,Ltd. Assignor: CENTRAL SOUTH University Contract record no.: X2022980025911 Denomination of invention: A complex polymer type organic binder for iron ore pellets and its application method Granted publication date: 20110427 License type: Exclusive License Record date: 20221212 |