CN101775489A - Method for preparing cold-bonded pellets from iron containing sludge by compound adhesive - Google Patents
Method for preparing cold-bonded pellets from iron containing sludge by compound adhesive Download PDFInfo
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- CN101775489A CN101775489A CN201010023054A CN201010023054A CN101775489A CN 101775489 A CN101775489 A CN 101775489A CN 201010023054 A CN201010023054 A CN 201010023054A CN 201010023054 A CN201010023054 A CN 201010023054A CN 101775489 A CN101775489 A CN 101775489A
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Abstract
The invention relates to a method for preparing cold-bonded pellets from sludge containing iron by an compound adhesive, belonging to the technical field of adhesives for metallurgical ironmaking. The method of the invention comprises the following concrete steps: adopting the compound adhesive of an inorganic adhesive and an organic adhesive, wherein the organic adhesive in the compound adhesive comprises the following raw materials: vinyl acetate, acroleic acid, sodium cellulose glycolate, polyvinyl alcohol, polyisobutylene, molasses and coal tar; and the inorganic adhesive comprises the following raw materials: bentonite, calcium oxide, basic sodium silicate, sodium chloride, talcum powder and light calcium carbonate. When the organic adhesive and the inorganic adhesive in the adhesive are prepared, the components are proportioned and controlled strictly in a proper order, so that the defects of one adhesive singly used can be avoided, and the compound adhesive has good caking property on the iron containing sludge. The method of the invention recycles iron from iron containing sludge and changes waste into resources, thereby reducing pollution of storage and transport on the environment, and saving the energy consumption in the sintering and high furnace production.
Description
Technical field
The invention belongs to metallurgical ironmaking and stick with glue the agent technical field, be specifically related to a kind of iron containing sludge that is applicable to and adopt composite adhesive to prepare the method for cooled agglomerated pellet.
Background technology
During iron and steel enterprise's iron-smelting blast furnace and steel-making converter were produced, producing had volume of smoke, reclaimed through processings such as environmental protection dedustings and obtained iron containing sludge (mainly containing materials such as Fe, C, CaO).This iron containing sludge mainly comprises converter mud and blast furnace mud, its sludge moisture content is very big, directly allocating raw material into can not uniform mixing, and easily causes the obstruction of the bonding of belt and material mouthful, the mud after the seasoning to harden into piece in the belt course of conveying and can not directly allocate in the raw material and use.Therefore, need make it again as raw materials for metallurgy by taking certain technical measures.Iron containing sludge after handling is used for the production of agglomerate and pellet, has remarkable economic efficiency and social benefit.
In the production process of cooled agglomerated pellet, with iron containing sludge and the additive after handling, tackiness agent, the water uniform mixing, carry out pressure ball with ball press, producing diameter is that 15～20mm thickness is the cylindrical green pellets of 15～25mm, green pellets is placed under the room temperature is integrated into the finished product cooled agglomerated pellet after the cooling then.
The making key of cooled agglomerated pellet is the selection of tackiness agent.At present, China metallurgy industry pellet is produced, and adopts wilkinite as tackiness agent mostly, but this tackiness agent is in the balling-up process, and the rate of return mine is 25～30%, and when drying, its rate of drying is slow, has influenced output, has increased energy consumption.And bentonitic main component is silicon-dioxide and aluminum oxide, and by universal experience, the wilkinite with addition of 1%, the taste of the iron content of pellet descends 0.6%, increases the quantity of slag 8%～10%.China's pellet is on average with addition of 4% wilkinite, many persons reach 7～8%, few person also is not less than 2.5%, thereby the iron content taste of pellet is descended, the energy consumption and the output of smelting have been influenced, blast furnace ironmaking is caused enormous economic loss, and the SiO2 in the wilkinite also has restraining effect to the reduction of iron, therefore press for the development of new binding agent.
In producing the cooled agglomerated pellet process, if only add inorganic adhesive, not only increased and made the ball cost, but also reduced the iron grade of cooled agglomerated pellet, make the use of cold fixed technology be subjected to very big restriction; If only add organic adhesion agent, not only can reduce the cohesive strength under the high temperature, and can cause that the hot strength of pelletizing descends, even the pelletizing explosion when causing high temperature.The present invention develops and adopts composite adhesive inorganic and that organic adhesion agent uses simultaneously, and this kind tackiness agent can not only avoid using separately the shortcoming of a certain class tackiness agent, and iron containing sludge is had advantages of good caking property.
Summary of the invention
The object of the present invention is to provide a kind of iron containing sludge that is applicable to adopt composite adhesive to prepare the method for cooled agglomerated pellet.
The iron containing sludge that is applicable to that the present invention proposes adopts composite adhesive to prepare the method for cooled agglomerated pellet, and concrete steps are as follows:
(1), organic adhesion agent synthesis phase: get the vinyl acetate that occupies machine tackiness agent total mass 45%-75%, vinylformic acid, Xylo-Mucine, in polyvinyl alcohol and the polyisobutene any three kinds, join in the four-necked bottle, add again and occupy the water of machine tackiness agent total mass 20～40%, under 80～200 ℃ of temperature and 400～1500 rev/mins of speed conditions, stir up to the glue mixing, then glue is poured out and be cooled to room temperature, glue that cooling is good and coal tar or molasses mix, coal tar or molasses occupy 5～15% of machine tackiness agent total mass, promptly get organic adhesion agent A;
(2), inorganic adhesive mix stages: wilkinite, calcium oxide, alkalescence bubble are spent any four kinds in alkali, sodium-chlor, talcum powder and the light calcium carbonate, mix, and promptly get inorganic adhesive B;
(3), mix operational phase: with step (1) gained organic adhesion agent A and step (2) gained inorganic adhesive B ratio, stir, obtain composite adhesive in 1: 2～2: 1; Mix in the mixture with gained composite adhesive adding fine iron breeze and iron containing sludge, carry out pressure ball, obtain green pellets, green pellets is placed under the room temperature promptly obtains the finished product cooled agglomerated pellet after the cooling then with ball press; Wherein: the mass ratio of composite adhesive, fine iron breeze and iron containing sludge is 1: 5: 5.
Among the present invention, any three kinds mass ratio described in the step (1) in vinyl acetate, vinylformic acid, Xylo-Mucine, polyvinyl alcohol and the polyisobutene is 1: 1: 1.
Among the present invention, any four kinds mass ratio in the step (2) in wilkinite, calcium oxide, alkalescence bubble flower alkali, sodium-chlor, talcum powder and the light calcium carbonate is 1: 1: 1.: 1.
Among the present invention, the diameter of step (3) gained green pellets is 15～20mm, and thickness is 15～25mm.
Among the present invention, add composite adhesive in the cooled agglomerated pellet production, compare with independent organic or inorganic tackiness agent, not only can reduce non-iron charge dosage in the pellet feed, improve the iron content taste of pellet, but also can improve iron containing sludge make the ball performance, reduce the pellet production cost, improve the pellet cold strength, the pellet epigranular is distributed; The more important thing is that the present invention reclaims iron from dirt mud, the change refuse is resource, has reduced the pollution to environment like this, reduced deposit, transit link, reduced secondary pollution, save the energy consumption in sintering and the blast furnace production link again.
The present invention compares with the tackiness agent of existing method, and cohesive strength is big, balling-up is fast, cold strength is big, water-absorbent is strong, can improve the ball of making of powdered iron ore, and it possesses following advantage simultaneously:
1, can effectively utilize iron containing sludge, iron containing sludge that mixes and fine iron breeze are suppressed balling-up at normal temperatures, no longer need this link of roasting, can not cause secondary pollution to environment;
2, this tackiness agent increases pellet liquid, and it is more perfect to impel ferric oxide to grow, and the pellet micropore is increased, and improves the intensity and the reductibility of pellet.
3, composite adhesive is a tackiness agent, is again reductive agent and catalyzer.
4, reclaim iron from iron containing sludge, the change refuse is resource, has reduced the pollution to environment like this, reduced deposit, transit link, saved the energy consumption in sintering, the blast furnace production link again.
5, use that tackiness agent pellet forming process of the present invention is simple, equipment requirements is low, cost cutting, with short production cycle, balling ratio can farthest be enhanced productivity, save production cost up to about 98%.
Embodiment
Further specify the present invention below by embodiment.
Embodiment 1
The composite adhesive prescription is as follows: (mark calculating by weight)
Getting vinyl acetate, vinylformic acid, Xylo-Mucine by proportioning joins in the four-necked bottle, add entry by proportioning again, under 90 ℃ of temperature and 1500 rev/mins of speed conditions, stir up to the glue mixing, then glue is poured out and be cooled to room temperature, to cool off good glue and molasses by proportioning at last and mix, promptly get organic adhesion agent A.Get wilkinite by proportioning, calcium oxide, high-temperature cement, alkalescence bubble flower alkali mixes and promptly gets inorganic adhesive B.
According to proportioning with organic adhesion agent A with inorganic adhesive B is compound stir (compositely proportional is 1: 1), (blending ratio is: composite adhesive: fine iron breeze: iron containing sludge=1: 5: 5) in the mixture by proportioning adding fine iron breeze and iron containing sludge again, after mixing, carry out pressure ball with ball press, producing diameter is that 15～20mm thickness is the cylindrical green pellets of 15～25mm, green pellets is placed under the room temperature promptly obtains the finished product cooled agglomerated pellet after the cooling then.
Embodiment 2
The composite adhesive prescription is as follows: (mark calculating by weight)
Getting vinyl acetate, vinylformic acid, Xylo-Mucine by proportioning joins in the four-necked bottle, add entry by proportioning again, under 90 ℃ of temperature and 1500 rev/mins of speed conditions, stir up to the glue mixing, then glue is poured out and be cooled to room temperature, to cool off good glue and molasses by proportioning at last and mix, promptly get organic adhesion agent A.Get wilkinite by proportioning, calcium oxide, high-temperature cement, alkalescence bubble flower alkali mixes and promptly gets inorganic adhesive B.
According to proportioning with organic adhesion agent A with inorganic adhesive B is compound stir (compositely proportional is 1: 1), (blending ratio is: composite adhesive: fine iron breeze: iron containing sludge=1: 5: 5) in the mixture by proportioning adding fine iron breeze and iron containing sludge again, after mixing, carry out pressure ball with ball press, producing diameter is that 15～20mm thickness is the cylindrical green pellets of 15～25mm, green pellets is placed under the room temperature promptly obtains the finished product cooled agglomerated pellet after the cooling then.
Embodiment 3
The composite adhesive prescription is as follows: (mark calculating by weight)
Getting vinyl acetate, vinylformic acid, Xylo-Mucine by proportioning joins in the four-necked bottle, add entry by proportioning again, under 90 ℃ of temperature and 1500 rev/mins of speed conditions, stir up to the glue mixing, then glue is poured out and be cooled to room temperature, to cool off good glue and molasses by proportioning at last and mix, promptly get organic adhesion agent A.Get wilkinite by proportioning, calcium oxide, high-temperature cement, alkalescence bubble flower alkali mixes and promptly gets inorganic adhesive B.
According to proportioning with organic adhesion agent A with inorganic adhesive B is compound stir (compositely proportional is 1: 1), (blending ratio is: composite adhesive: fine iron breeze: iron containing sludge=1: 5: 5) in the mixture by proportioning adding fine iron breeze and iron containing sludge again, after mixing, carry out pressure ball with ball press, producing diameter is that 15～20mm thickness is the cylindrical green pellets of 15～25mm, green pellets is placed under the room temperature promptly obtains the finished product cooled agglomerated pellet after the cooling then.
The test result of embodiment:
Cooled agglomerated pellet by composite adhesive preparation of the present invention, adopt following testing method to test:
Cooled agglomerated pellet after the compression moulding is measured green-ball and is fallen index.Pelletizing is measured cold ultimate compression strength, hot compressive strength (900 ℃), tumbler index after the maintenance seasoning.Each index is parallel does three tests, gets its mean value, and above performance index are all measured by national respective standard.
Concrete data see the following form:
| Test event | Embodiment 1 | Embodiment 2 | Embodiment 3 |
| Cold ultimate compression strength/(N/ ball) | ??1794 | ??1725 | ??2166 |
| Hot compressive strength (900 ℃)/(N/ ball) | ??862 | ??1176 | ??1441 |
| Tumbler index (＞6.3mm)/% | ??74.1 | ??76.4 | ??82.3 |
In the table:
Cold ultimate compression strength is meant that it can bear the intensity of bed of material load effect on reduction apparatus, pairing pressure size expression when beginning the be full of cracks distortion with green-ball under the pressurized condition.Usually represent with N/ ball.
Hot compressive strength (900 ℃) is meant that it can bear the intensity of bed of material load effect on reduction apparatus, pairing pressure size expression when beginning the be full of cracks distortion after being heated to 900 ℃ with green-ball under the pressurized condition.Usually represent with N/ ball.
Tumbler index is the physical performance index of reflection agglomerate physical strength.The unitary determination value is that the gained granularity accounts for the per-cent of sample gross weight after testing in the rotary drum of special use with sample greater than the sample weight of required standard.Tumbler index is big more, and the physical strength in the ore deposit of surveying is high more.
Claims (4)
1. one kind is applicable to that iron containing sludge adopts composite adhesive to prepare the method for cooled agglomerated pellet, is characterized in that concrete steps are as follows:
(1), organic adhesion agent synthesis phase: get the vinyl acetate that occupies machine tackiness agent total mass 45%-75%, vinylformic acid, Xylo-Mucine, in polyvinyl alcohol and the polyisobutene any three kinds, join in the four-necked bottle, add again and occupy the water of machine tackiness agent total mass 20～40%, under 80～200 ℃ of temperature and 400～1500 rev/mins of speed conditions, stir up to the glue mixing, then glue is poured out and be cooled to room temperature, glue that cooling is good and coal tar or molasses mix, coal tar or molasses occupy 5～15% of machine tackiness agent total mass, promptly get organic adhesion agent A;
(2), inorganic adhesive mix stages: wilkinite, calcium oxide, alkalescence bubble are spent any four kinds in alkali, sodium-chlor, talcum powder and the light calcium carbonate, mix, and promptly get inorganic adhesive B;
(3), mix operational phase: with step (1) gained organic adhesion agent A and step (2) gained inorganic adhesive B ratio, stir, obtain composite adhesive in 1: 2～2: 1; Mix in the mixture with gained composite adhesive adding fine iron breeze and iron containing sludge, carry out pressure ball, obtain green pellets, green pellets is placed under the room temperature promptly obtains the finished product cooled agglomerated pellet after the cooling then with ball press; Wherein: the mass ratio of composite adhesive, fine iron breeze and iron containing sludge is 1: 5: 5.
2. the iron containing sludge that is applicable to according to claim 1 adopts composite adhesive to prepare the method for cooled agglomerated pellet, it is characterized in that any three kinds mass ratio in vinyl acetate, vinylformic acid, Xylo-Mucine, polyvinyl alcohol and the polyisobutene is 1: 1: 1 described in the step (1).
3. the iron containing sludge that is applicable to according to claim 1 adopts composite adhesive to prepare the method for cooled agglomerated pellet, it is characterized in that any four kinds mass ratio in wilkinite in the step (2), calcium oxide, alkalescence bubble flower alkali, sodium-chlor, talcum powder and the light calcium carbonate is 1: 1: 1: 1.
4. the iron containing sludge that is applicable to according to claim 1 adopts composite adhesive to prepare the method for cooled agglomerated pellet, it is characterized in that the diameter of step (3) gained green pellets is 15～20mm, and thickness is 15～25mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010100230541A CN101775489B (en) | 2010-01-21 | 2010-01-21 | Method for preparing cold-bonded pellets from iron containing sludge by compound adhesive |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010100230541A CN101775489B (en) | 2010-01-21 | 2010-01-21 | Method for preparing cold-bonded pellets from iron containing sludge by compound adhesive |
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| Publication Number | Publication Date |
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| CN101775489A true CN101775489A (en) | 2010-07-14 |
| CN101775489B CN101775489B (en) | 2011-12-07 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102936652A (en) * | 2012-10-29 | 2013-02-20 | 中南大学 | Preparation technique of iron ore pellets |
| CN105217918A (en) * | 2015-09-18 | 2016-01-06 | 高明逊 | Sewage sludge biomass pelletizing, turning sludge into fuel treatment process |
| CN106702151A (en) * | 2017-03-11 | 2017-05-24 | 重庆臻焱节能环保科技有限公司 | Compound adhesive for cold-pressed pellets and preparation method of compound adhesive |
| CN112941311A (en) * | 2021-01-29 | 2021-06-11 | 武汉科技大学 | Preparation method of composite cold-pressed pellets for converter steelmaking |
| CN113122711A (en) * | 2021-04-07 | 2021-07-16 | 中南大学 | Method for preparing solid organic/inorganic composite binder by using steel oily sludge, binder and application |
-
2010
- 2010-01-21 CN CN2010100230541A patent/CN101775489B/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102936652A (en) * | 2012-10-29 | 2013-02-20 | 中南大学 | Preparation technique of iron ore pellets |
| CN102936652B (en) * | 2012-10-29 | 2013-11-06 | 中南大学 | Preparation technique of iron ore pellets |
| CN105217918A (en) * | 2015-09-18 | 2016-01-06 | 高明逊 | Sewage sludge biomass pelletizing, turning sludge into fuel treatment process |
| CN106702151A (en) * | 2017-03-11 | 2017-05-24 | 重庆臻焱节能环保科技有限公司 | Compound adhesive for cold-pressed pellets and preparation method of compound adhesive |
| CN112941311A (en) * | 2021-01-29 | 2021-06-11 | 武汉科技大学 | Preparation method of composite cold-pressed pellets for converter steelmaking |
| CN113122711A (en) * | 2021-04-07 | 2021-07-16 | 中南大学 | Method for preparing solid organic/inorganic composite binder by using steel oily sludge, binder and application |
| CN113122711B (en) * | 2021-04-07 | 2022-04-01 | 中南大学 | Method for preparing solid organic/inorganic composite binder by using steel oily sludge, binder and application |
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| CN101775489B (en) | 2011-12-07 |
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