CN102851491A - Red mud composite binder for oxidized pellets - Google Patents
Red mud composite binder for oxidized pellets Download PDFInfo
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- CN102851491A CN102851491A CN2012102776802A CN201210277680A CN102851491A CN 102851491 A CN102851491 A CN 102851491A CN 2012102776802 A CN2012102776802 A CN 2012102776802A CN 201210277680 A CN201210277680 A CN 201210277680A CN 102851491 A CN102851491 A CN 102851491A
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- red mud
- binding agent
- powder
- compound binding
- magnesium ore
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Abstract
The invention discloses red mud composite binder for oxidized pellets. The red mud composite binder is prepared by waste red mud of aluminum plants, magnesite stone and humus binder. The red mud composite binder has characteristics of good hydrophily, excellent binding effect, low price, high iron content and the like. The granularity of the red mud composite binder is smaller than 200 meshes, partial weight ratio is larger than or equal to 90%, and water content is smaller than or equal to 1%. Therefore, the red mud composite binder can partially or totally replace bentonite to be used for producing the oxidized pellets. Compared with the technology completely utilizing the bentonite to produce the oxidized pellets, production rates of pellet TFe, sinter TFe and an ironmaking system are all improved, and slag quantity of a blast furnace is reduced. Besides, the content of MgO in the pellets is increased, so that the thermodynamic property of the pellets is good, and operation of the blast furnace is facilitated.
Description
Technical field
The invention belongs to chemical industry, metallurgy industry technical field, be specifically related to a kind of acid pellet red mud compound binding agent.
Background technology
Along with the development of Iron And Steel Industry, the required material quantity of smelting iron is increasing.When smelting, in order to improve the efficient of smelting and the quality of iron, can enter stove just make pellet ore after need to the ore fine grinding is selected.Binding agent is that fine iron breeze is made the indispensable important component of pelletizing, it should have preferably balling-up, group's ball of making has preferably resistance to compression and falls impact resistance intensity, also to have preferably low temperature intensity and hot strength, preferably the performances such as the coefficient of expansion, reduction degree, reflowing temperature.At present, the binding agent that oneself uses mainly contains mineral binder bond, such as swelling scholar, water glass, slaked lime, cement, sticking scholar etc.; Organic binder bond is such as humic acids, carboxymethyl cellulose etc.; These technology respectively have advantage, but deficiency is arranged.
Mineral binder bond is mainly take the swelling scholar as main, because wilkinite has the advantage that price is low, cohesiveness is good, Steel Plant produce acid pellet and generally adopt wilkinite as binding agent, and wilkinite is generally 1.5% ~ 5% with addition of amount, and bentonitic composition is mainly SiO
2And Al
2O
3Produce pelletizing with wilkinite as binding agent, mainly can produce following detrimentally affect to ironmaking system:
1, reduce the total iron TFe of finished pellet content, every increase by the 1% calcium-base bentonite consumption of ton pellet, finished pellet TFe content approximately reduces by 0.6%;
2, according to the blast furnace slag making requirement, the SiO that is brought into by wilkinite
2The unslaked lime that need to be in agglomerate be complementary with addition of quantity or Wingdale etc. contain the CaO material, and every increase 1kg calcium-base bentonite consumption approximately needs additionally with addition of 1.44kg unslaked lime, and this can reduce agglomerate TFe content;
3, pellet, agglomerate TFe content, and then reduce BF Productivity;
4, wilkinite and contain the adding of CaO material can increase the blast furnace quantity of slag, every increase 1kg calcium-base bentonite consumption, and the blast furnace slag appointment increases 2.89kg.
Therefore, need to propose a kind of more perfect binding agent and preparation method thereof.
Summary of the invention
The invention provides a kind of acid pellet red mud compound binding agent and preparation method thereof.
In order to solve this technical problem, the present invention mixes to prepare acid pellet red mud compound binding agent by red mud, magnesium ore and corruption being planted the class binding agent, and the preparation method of this binding agent comprises:
1, red mud is dried, broken, screening processes, and obtains red mud powder.
2, magnesium ore is carried out fragmentation, screening processing, obtain the magnesium ore powder.
3, red mud powder, the magnesium ore powder handled well are planted the class binding agent with corruption and mix by 60 ~ 90:5 ~ 30:5 ~ 15, obtain the red mud compound binding agent.
Wherein red mud described in the step 1 is the waste that aluminium manufacturer discharges when extracting aluminum oxide from bauxite, and 1 ton of aluminum oxide of every production approximately produces 1.0 tons ~ 1.4 tons of red muds.Contain the elements such as abundant iron, aluminium, silicon and a small amount of calcium, magnesium, manganese, titanium, sodium in the red mud, granularity is thinner, and property is sticking, and good water absorption possesses fully as the characteristic of acid pellet with binding agent, also confirms really so through laboratory test.The present invention selects the higher Bayer process red mud of iron-holder as one of component, its Fe
2O
3, SiO
2And Al
2O
3Content is respectively 30% ~ 60%, 2～20% and 10～20%.But, according to the blast furnace slag making requirement, be the Al in the balance red mud
2O
3, need to be with addition of the material that contains in right amount MgO.The ore such as light dolomite, light burned brucite all contains higher MgO composition, and light dolomite, light burned brucite all have good viscosity after being broken into powdery, is fit to produce the red mud compound binding agent with the red mud adapted.The red mud compound binding agent because containing the iron of higher composition in the red mud, compared to wilkinite, is conducive to improve the quality of pelletizing for the production of acid pellet; Because red mud compound binding agent price is lower, be conducive to reduce the production cost of pelletizing; Use the red mud compound binding agent, the extra unslaked lime of agglomerate reduces with addition of amount, is conducive to reduce the agglomerate production cost, improves agglomerate TFe content; And then the raising BF Productivity, reduce the quantity of slag.Adopt thinner red mud powder to help to improve Binder Properties.
In the wherein said step 1, the low-temperature heat source that red mud oven dry thermal source can be passed into disuse for Steel Plant, 200 ℃ ~ 400 ℃ of heat source temperatures.
In the wherein said step 1, general drying machine drying is adopted in the red mud oven dry, also can adopt the additive method oven dry, and those skilled in the art can select flexibly according to practical situation.
In the wherein said step 1, moisture≤2% after the red mud oven dry.
In the wherein said step 1, red mud adopts ball mill or Raymond mill to carry out fragmentation, and perhaps other modes are carried out fragmentation to red mud, and those skilled in the art can select flexibly according to practical situation.
In the wherein said step 1, after the red mud screening, the red mud powder granularity less than 200 orders part 〉=90%.
Preferred, in the described step 1, the moisture of red mud powder≤1%.
In the wherein said step 2, magnesium ore is selected the magnesium ore (MgO content is 15% ~ 90%) through light-burned processing.When MgO content is higher in adopting magnesium ore, then can reduce the consumption of magnesium ore powder, but highly purified MgO ore can bring the straight line of cost to rise the economic benefit variation; When the content of MgO in the magnesium ore hangs down, then can suitably increase the consumption of magnesium ore powder.Preferably, the proportioning of red mud and magnesium ore should satisfy following relation: the two Al altogether
2O
3Content is 1.5 times ~ 1.7 times of MgO content.Adopt thinner magnesium ore powder to help to improve Binder Properties.
In the wherein said step 2, magnesium ore adopts ball mill or Raymond mill to carry out fragmentation, and perhaps other modes are carried out fragmentation to red mud, and those skilled in the art can select flexibly according to practical situation.
In the wherein said step 2, after the magnesium ore screening, the magnesium ore Powder Particle Size less than 200 orders part 〉=90%.
In the wherein said step 2, the moisture of magnesium ore powder≤1%.
In the wherein said step 3, corruption plant class binding agent granularity less than 200 orders parts 〉=90%.
In the wherein said step 3, it is a class organic binder bond well known in the art that the class binding agent is planted in corruption, comprises the materials such as humic acids, Sodium salts humic acids, and its main component is hydrocarbon polymer, all burns more than 90% in the pellet roasting process.Preferably thinner Sodium salts humic acids powder of class binding agent is planted in corruption, helps to improve Binder Properties.
In the wherein said step 3, red mud powder, magnesium ore powder and corruption are planted the class binding agent and can be adopted the dry type mixer to mix.
The present invention selects waste red mud, magnesium ore and the corruption of aluminium manufacturer to plant the class binding agent and produces the red mud compound binding agent, have the characteristics such as good hydrophilic property, bond effect are good, low price, iron-holder height, can partly or entirely replace wilkinite to be used for acid pellet production.With respect to all producing acid pellet with wilkinite, pellet TFe, agglomerate TFe, ironmaking system productivity all increase, the blast furnace quantity of slag then reduces to some extent.Simultaneously, because the raising of MgO content in the pelletizing, the pelletizing thermomechanical property becomes better, more is conducive to blast furnace operating.
Description of drawings
Fig. 1: process flow sheet of the present invention.
Embodiment
Embodiment 1:
Composition is: TFe 37.6%, Al
2O
311.56%, SiO
24.27%, the red mud of CaO 0.46%, MgO 0.44% is with drying grate oven dry (200 ℃), and ball mill is broken, revolve the riddler screening after, obtain granularity less than the red mud powder of 200 order parts 95%; Composition is TFe 0.7%, SiO
26.2%, the light burned brucite of CaO 1.4%, MgO 70.2% is broken with ball mill, revolve the riddler screening after, obtain granularity less than the light burned brucite powder of 200 order parts 95%; Red mud powder, light burned brucite powder, corruption are planted class binding agent (Sodium salts humic acids) according to the mass percent 82:8:10 mixing of preparing burden, and gained red mud compound binding agent composition is TFe 31.02%, Al
2O
39.54%, SiO
23.99%, CaO 0.49%, MgO 5.63%.After this red mud compound binding agent is used for acid pellet production, compared to calcium-base bentonite, calculate by daily proportioning 3%, pelletizing TFe improves 0.87%, and the ton agglomerate can be used unslaked lime 9.99kg less, and agglomerate TFe improves 0.93%, ton scum amount reduces 5.47kg, remarkable in economical benefits.
Embodiment 2:
Composition is: TFe 37.6%, Al
2O
311.56%, SiO
24.27%, the red mud of CaO 0.46%, MgO 0.44% is with drying grate oven dry (400 ℃), and ball mill is broken, revolve the riddler screening after, obtain granularity less than the red mud powder of 200 order parts 95%; Composition is SiO
23.9%, the light dolomite of CaO 29.43%, MgO 19.32% is broken with Raymond mill, revolve the riddler screening after, obtain granularity less than the light dolomite powder of 200 order parts 95%; Red mud powder, light dolomite powder and corruption are planted class binding agent (Sodium salts humic acids) and are prepared burden according to mass percent 68:22:10 and mix, and gained red mud compound binding agent composition is TFe 25.38%, Al
2O
37.80%, SiO
23.76%, CaO6.93%, MgO 4.64%.After this red mud compound binding agent is used for acid pellet production, compared to calcium-base bentonite, calculate by daily proportioning 3%, pelletizing TFe improves 0.71%, can join less unslaked lime 10.43kg in the sintering, and agglomerate TFe improves 0.94%, ton scum amount reduces 4.48kg, remarkable in economical benefits.
Example 3:
Composition is: TFe 37.6%, Al
2O
311.56%, SiO
24.27%, the red mud of CaO 0.46%, MgO 0.44% is with drying grate oven dry (350 ℃), and ball mill is broken, revolve the riddler screening after, obtain granularity less than the red mud powder of 200 order parts 95%; Composition is TFe 0.7%, SiO
26.2%, the light burned brucite of CaO 1.4%, MgO 70.2% is broken with ball mill, revolve the riddler screening after, obtain granularity less than the light burned brucite powder of 200 order parts 95%; Red mud powder, light burned brucite powder, corruption are planted class binding agent (potassium humate) according to the mass percent 82:8:10 mixing of preparing burden, and gained red mud compound binding agent composition is TFe 31.02%, Al
2O
39.54%, SiO
23.99%, CaO 0.49%, MgO 5.63%.When acid pellet was produced, calcium-base bentonite and red mud compound binding agent respectively joined 1.5%, and then pelletizing TFe improves 0.44%, and the ton agglomerate can be used unslaked lime 5.0kg less, and agglomerate TFe improves 0.47%, and ton scum amount reduces 2.74kg, and economic benefit is also fine.
Example 4:
Composition is: TFe 30.0%, Al
2O
313%, SiO
220.0%, the red mud of CaO 0.46%, MgO 0.45% is with drying grate oven dry (350 ℃), and ball mill is broken, revolve the riddler screening after, obtain granularity less than the red mud powder of 200 order parts 95%; Composition is TFe 0.7%, SiO
26.2%, the light dolomite of CaO 31.8%, MgO 15% is broken with ball mill, revolve the riddler screening after, obtain granularity less than the light dolomite powder of 200 order parts 95%; Red mud powder, light burned brucite powder, corruption are planted class binding agent (Sodium salts humic acids) according to the mass percent 60:30:10 mixing of preparing burden, and gained red mud compound binding agent composition is TFe 18.21%, Al
2O
37.81%, SiO
213.86%, CaO 9.82%, MgO 4.77%.When acid pellet was produced, calcium-base bentonite and red mud compound binding agent respectively joined 1.5%, and then pelletizing TFe improves 0.26%, and the ton agglomerate can be used unslaked lime 2.74kg less, and agglomerate TFe improves 0.28%, and ton scum amount reduces 1.42kg, and economic benefit is also fine.
Embodiment 5:
Composition is: TFe 43.6%, Al
2O
310.50%, SiO
22.01%, the red mud of CaO 0.52%, MgO 0.53% is with drying grate oven dry (400 ℃), and ball mill is broken, revolve the riddler screening after, obtain granularity less than the red mud powder of 200 order parts 95%; Composition is SiO
26.2%, the light dolomite of CaO 23.80%, MgO 28.0% is broken with Raymond mill, revolve the riddler screening after, obtain granularity less than the light dolomite powder of 200 order parts 95%; Red mud powder, light dolomite powder and corruption are planted class binding agent (Sodium salts humic acids) and are prepared burden according to mass percent 70:15:15 and mix, and gained red mud compound binding agent composition is TFe30.52%, Al
2O
37.35%, SiO
22.34%, CaO 3.93%, MgO 4.57%.After this red mud compound binding agent is used for acid pellet production, compared to calcium-base bentonite, calculate by daily proportioning 3%, pelletizing TFe improves 0.86%, can join less unslaked lime 9.93kg in the sintering, and agglomerate TFe improves 0.93%, ton scum amount reduces 5.62kg, remarkable in economical benefits.
Example 6:
Composition is: TFe 21.8%, Al
2O
319.05%, SiO
28.00%, the red mud of CaO 0.50%, MgO 0.49% is with drying grate oven dry (350 ℃), and ball mill is broken, revolve the riddler screening after, obtain granularity less than 200 orders part greater than 95% red mud powder; Composition is SiO
23.2%, the light burned brucite of CaO 0.49%, MgO 90.2% is broken with ball mill, revolve the riddler screening after, obtain granularity less than the light burned brucite powder of 200 order parts 95%; Red mud powder, light burned brucite powder, corruption are planted class binding agent (Sodium salts humic acids) according to the mass percent 84:11:5 mixing of preparing burden, and gained red mud compound binding agent composition is TFe 18.31%, Al
2O
316.00%, SiO
27.07%, CaO 0.47%, MgO 10.33%.When acid pellet was produced, calcium-base bentonite and red mud compound binding agent respectively joined 1.5%, and then pelletizing TFe improves 0.26%, and the ton agglomerate can be used unslaked lime 4.73kg less, and agglomerate TFe improves 0.44%, and ton scum amount reduces 2.23kg, and economic benefit is also fine.
Claims (9)
1. the compound binding agent that acid pellet is used is characterized in that, described binding agent comprises by weight percentage:
Red mud powder, 60 ~ 90%, described red mud powder is made by Bayer process red mud, and its main chemical constitution comprises Fe by weight
2O
3: 30～60%, SiO
2: 2～20% and Al
2O
3: 10～20%;
The magnesium ore powder, 5～30%, the content of MgO is not more than 90% in the described magnesium ore powder, is not less than 15%;
Class binding agent, 5 ~ 15% are planted in corruption.
2. compound binding agent according to claim 1 is characterized in that, greater than 95%, and water content is not more than 2% to described red mud powder granularity less than 200 order part weight accountings.
3. compound binding agent according to claim 1 is characterized in that, described magnesium ore powder comprises one or more in the following material: light dolomite, light burned brucite.
4. according to claim 1 or 3 described compound binding agents, it is characterized in that, greater than 95%, and water content is not more than 1% to described magnesium ore Powder Particle Size less than 200 order particulate fraction weight accountings.
5. compound binding agent according to claim 1 is characterized in that, described corruption plant class binding agent granularity less than 200 order part weight accountings greater than 95%, and water content is not more than 2%.
6. compound binding agent according to claim 1 or 5 is characterized in that, it is Sodium salts humic acids that the class binding agent is planted in described corruption.
7. compound binding agent according to claim 1 is characterized in that, greater than 95%, and water content is not more than 1% to described compound binding agent granularity less than 200 order part weight accountings.
8. compound binding agent according to claim 1 is characterized in that, Al in the described compound binding agent
2O
3With the weight ratio of MgO be 1.5～1.7:1.
9. a method for preparing arbitrary described compound binding agent in the claim 1～8 is characterized in that, described method comprises:
1) red mud is dried, broken, screening processes, and obtains red mud powder;
2) magnesium ore is carried out fragmentation, screening processing, obtain the magnesium ore powder;
3) red mud powder, the magnesium ore powder handled well being planted the class binding agent with corruption mixes.
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| CN2012102776802A CN102851491A (en) | 2012-08-06 | 2012-08-06 | Red mud composite binder for oxidized pellets |
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|---|---|---|---|
| CN2012102776802A CN102851491A (en) | 2012-08-06 | 2012-08-06 | Red mud composite binder for oxidized pellets |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103146915A (en) * | 2013-03-01 | 2013-06-12 | 莱芜钢铁集团有限公司 | Titaniferous red mud compound binder and preparation method thereof |
| CN103468942A (en) * | 2013-09-07 | 2013-12-25 | 鞍钢股份有限公司 | Composite binder for hot-pressed ferrous coke and preparation method of composite binder |
| CN103924068A (en) * | 2013-01-14 | 2014-07-16 | 中国地质大学（北京） | Pellet binder based on red mud and iron-bearing minerals, and preparation method thereof |
| RU2542186C1 (en) * | 2013-08-06 | 2015-02-20 | Федеральное государственное бюджетное учреждение науки Институт металлургии Уральского отделения Российской академии наук (ИМЕТ УрО РАН) | Iron-ore pellet obtaining method |
| CN113652545A (en) * | 2021-07-15 | 2021-11-16 | 鞍钢股份有限公司 | Production method of large-stacking-angle fluxed pellets |
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| CN113652545B (en) * | 2021-07-15 | 2022-10-18 | 鞍钢股份有限公司 | Production method of large-stacking-angle fluxed pellets |
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Application publication date: 20130102 |