CN102816926A - Bentonite used for pellets, and preparation method thereof - Google Patents
Bentonite used for pellets, and preparation method thereof Download PDFInfo
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- CN102816926A CN102816926A CN 201110149924 CN201110149924A CN102816926A CN 102816926 A CN102816926 A CN 102816926A CN 201110149924 CN201110149924 CN 201110149924 CN 201110149924 A CN201110149924 A CN 201110149924A CN 102816926 A CN102816926 A CN 102816926A
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Abstract
The invention discloses bentonite used for pellets, and a preparation method thereof. The bentonite is composed of the components of, by weight: 90-100 parts of bentonite, 3-5 parts of industrial alkali, and 1-3 parts of cellulose ethers or cellulose sodium. When the pellet-use bentonite provided by the invention is used for coating obtained iron ore pellets, pellet bursting is reduced. The iron ore pellets can be prevented from bursting under more than 3000 Newton and 10 times of drops. Silicon content of the pellets is greatly reduced. As a result of furnace casting experiments, when the pellets are added at a temperature of 1200 DEG C, the pellets do not burst. Also, an iron tapping speed is substantially improved. Compared with a traditional method that only bentonite is used as an additive, the pellet-use bentonite provided by the invention is advantaged in high adhesive force, high pellet degree, reduced roasting time, good roasting performance, improved pellet ore grade, and reduced energy consumption.
Description
Technical field
The present invention relates to a kind of wilkinite, particularly relate to a kind of pelletizing with wilkinite and preparation method thereof.
Background technology
The agglomerates of sintered pellets sticker is a key auxiliary material of producing steel industry processing pellet, and the good and bad direct relation of its performance the quality quality of pelletizing.The sintering plant pellet formation all is that sticker is made ball with the wilkinite both at home and abroad for a long time; Wilkinite is the sticker a kind of commonly used in traditional pellet additive; Wilkinite can improve the dropping strength and the ultimate compression strength of green-ball, in addition, and the burst temperature in the time of can also improving the green-ball drying.Bentonitic staple is sio2 and AL203; Whenever with addition of 1% wilkinite, the ferrous grade of pellet can descend 0.6%; China's pellet with addition of bentonitic percentage composition on average about 3-5%; Exist mostly that the green-ball Pulverization ratio is high, rate of drying is slow, intensity is low, the rate of return mine is high, reduce phenomenon such as grade, thereby has a strong impact on the energy consumption and the output of blast furnace ironmaking.
And, produce steel industry and generally all use wilkinite as the pelletizing caking agent, the natural calcium base bentonite, its unit consumption is more than 35kg/ ton ball, and unit consumption is higher; And sodium bentonite though unit consumption decreases, the explosion problem occurs easily.In order to select the more excellent pelletizing caking agent of use properties, reduce caking agent in the pellet formation process with addition of amount, guarantee the full iron grade of finished ball nodulizing, improve the pellet metallurgical performance, be starved of the wilkinite that a kind of novel metallurgical pellet formation of research and development is used.
Summary of the invention
To the weak point of above-mentioned prior art, the object of the invention is to overcome the shortcoming of above-mentioned prior art, provides a kind of pelletizing with wilkinite and preparation method thereof.
The technical scheme that the present invention adopts is: a kind of pelletizing is used wilkinite, mainly is made up of each component of following weight part: wilkinite 90-100 part, industrial soda 3-5 part, ether of cellulose or sodium cellulosate 1-3 part.
As preferably, the weight part of each component is: 3 parts of 100 parts of wilkinites, 5 parts of industrial soda, ether of cellulose or sodium cellulosates.
Perhaps, 90 parts of wilkinites, 3 parts of industrial soda, ether of cellulose or sodium cellulosate are 1 part.
As preferably, described industrial soda is industrial monohydrate or industrial sodium hydroxide.
As preferably, described wilkinite is a sodium bentonite.
Further, described sodium bentonite is a smectite content greater than 55% sodium bentonite.
Prepare described pelletizing and use bentonitic method, may further comprise the steps:
(1) wilkinite is pulverized;
(2) toward the industrial soda that in the wilkinite of pulverizing, adds 3-5 part weight part of 90-100 part weight part;
(3) two kinds of material are mixed;
(4) compound is squeezed into piece;
The piece stockpile that (5) will be squeezed into is put and was accomplished sodium in 15-20 days;
(6) the piece material that will accomplish sodium carried out natural airing 5-15 days;
(7) the piece material that will accomplish natural airing carries out warm air drying, makes moisture reach weight percent below 12%;
(8) with addition of the ether of cellulose or the sodium cellulosate of 1-3 part weight part, stir;
(9) through grinding to form 1200-1500 purpose particle, promptly get.
Pelletizing of the present invention is used bentonitic application method: be used for the rotary kiln pelletizing, adopt 2-3kg pelletizing of the present invention can wrap up 1 ton of iron charge with wilkinite; Be used for the shaft furnace pelletizing, adopt 4kg pelletizing of the present invention can wrap up 1 ton of iron charge with wilkinite; Said pelletizing is mixed with the part by weight of the smart powder of wilkinite and iron according to 2-4:1000, and the back that stirs adds moisture, adopts disk or drum pelletizer to cause green-ball; The green-ball of making is adopted conventional rotary kiln pelletizing method or the preheating of shaft furnace pelletizing method, calcining and cooling, get the finished ball nodulizing.
Wilkinite belongs in inorganic materials and coheres the very strong material of function, and meeting water has high viscosity, and iron powder per ton need add the wilkinite of 35-45 kilogram just can process pelletizing; But the silicon content of wilkinite self is too high; Directly having influenced the quality of steel, to the later stage trouble of having smelted iron silicon ribbon, is to reduce silicon content; Must reduce bentonitic consumption, be converted into sodium bentonite by calcium-base bentonite.For this reason, the present invention has at first improved bentonitic gluing performance: wilkinite is handled through sodium, with the volume of water diffusion ether of cellulose or sodium cellulosate; Scleroma is ground into 1200-1500 purpose super-fine powder through supper micron mill (high pressure draft Ultra-micro-grinding machine) after dry, does not need homogenizing just can go into operation with original equipment, resulting like this micro mist agent particle size reduction, fluffy, the surface-area increase of ultra micro; Volumetric expansion, the parcel ability strengthens greatly, and glutinous and degree, water-absorbent and perforate property improve greatly; Has the outstanding effect of cohering; The product of the present invention of 3-4 kilogram just can wrap up one ton iron powder, has so also reduced the molten amount of silicon greatly, has improved the quality of iron; For the production of high-quality steel is laid a good foundation, also significantly reduced production cost simultaneously.
The invention has the advantages that: experiment confirm, wrap up the iron ore pellets that obtains with pelletizing of the present invention with wilkinite, the explosion of ball reduces; Iron ore pellets can reach 3000 above newton; Drop does not produce slight crack 10 times, and silicon content descends greatly, throws the stove test and confirms; In the time of 1200 ℃, going into stove can not blow; And can significantly improve the speed of tapping a blast furnace, compare as additive with traditional simple wilkinite and have characteristics such as cohesive force is strong, the pelletizing degree is high, shorten roasting time, and the roasting performance is good, pellet grade improves, cut down the consumption of energy.
In the pellet production process, reduce with wilkinite unit consumption of the present invention, and can effectively improve the balling-up property of green-ball, improve the burst temperature of green-ball, improve the metallurgical performance of pellet, production has the effect of raising the output consumption reduction to pellet.
Embodiment
Below in conjunction with specific embodiment the present invention is done further detailed description.
Embodiment one pelletizing is used bentonitic preparation
(1) wilkinite is pulverized;
(2) toward the industrial soda that in the wilkinite of pulverizing, adds 3 parts of weight parts of 90 parts of weight parts;
(3) two kinds of material are mixed;
(4) compound is squeezed into piece;
The piece stockpile that (5) will be squeezed into is put and was accomplished sodium in 15-20 days;
(6) the piece material that will accomplish sodium carried out natural airing 5-15 days;
(7) the piece material that will accomplish natural airing carries out warm air drying, makes moisture reach weight percent below 12%;
(8) with addition of the ether of cellulose or the sodium cellulosate of 1 part of weight part, stir;
(9) through grinding to form 1200-1500 purpose particle, promptly get.
Embodiment two pelletizings are used bentonitic preparation
Prepare described pelletizing and use bentonitic method, may further comprise the steps:
(1) wilkinite is pulverized;
(2) toward the industrial soda that in the wilkinite of pulverizing, adds 4 parts of weight parts of 95 parts of weight parts;
(3) two kinds of material are mixed;
(4) compound is squeezed into piece;
The piece stockpile that (5) will be squeezed into is put and was accomplished sodium in 15-20 days;
(6) the piece material that will accomplish sodium carried out natural airing 5-15 days;
(7) the piece material that will accomplish natural airing carries out warm air drying, makes moisture reach weight percent below 12%;
(8) with addition of the ether of cellulose or the sodium cellulosate of 2 parts of weight parts, stir;
(9) through grinding to form 1200-1500 purpose particle, promptly get.
Embodiment three pelletizings are used bentonitic preparation
Prepare described pelletizing and use bentonitic method, may further comprise the steps:
(1) wilkinite is pulverized;
(2) toward the industrial soda that in the wilkinite of pulverizing, adds 5 parts of weight parts of 100 parts of weight parts;
(3) two kinds of material are mixed;
(4) compound is squeezed into piece;
The piece stockpile that (5) will be squeezed into is put and was accomplished sodium in 15-20 days;
(6) the piece material that will accomplish sodium carried out natural airing 5-15 days;
(7) the piece material that will accomplish natural airing carries out warm air drying, makes moisture reach weight percent below 12%;
(8) with addition of the ether of cellulose or the sodium cellulosate of 3 parts of weight parts, stir;
(9) through grinding to form 1200-1500 purpose particle, promptly get.
Test Example: pelletizing of the present invention is tested given the test agent with bentonitic application performance: the embodiment of the invention one
Use wilkinite to three prepared pelletizings, be numbered given the test agent 1, given the test agent 2 and given the test agent 3 respectively.
TP: the part by weight of the smart powder of given the test agent 1, given the test agent 2 and given the test agent 3 and iron according to 4:1000 mixed, and the back that stirs adds a certain amount of moisture, adopts disk or drum pelletizer to cause green-ball; Adopt conventional rotary kiln pelletizing method or shaft furnace pelletizing method to carry out drying, preheating, calcining and cooling the green-ball of making, get the finished ball nodulizing.
Measure ultimate compression strength, dropping strength and the burst temperature of green-ball respectively according to ordinary method; Measure indexs such as the ultimate compression strength of finished ball nodulizing, wear-resistant index, concrete outcome is seen table 1.
Table 1 with pelletizing of the present invention with the prepared green-ball of wilkinite and the performance index of finished ball nodulizing
Can find out that from test-results can wrap up the smart powder of iron of lOOOkg with the pelletizing of the present invention of 4kg fully with wilkinite, each item performance of prepared green-ball that obtains and finished ball nodulizing all meets the requirements.
Claims (8)
1. a pelletizing is used wilkinite, it is characterized in that mainly being made up of each component of following weight part: wilkinite 90-100 part, industrial soda 3-5 part, ether of cellulose or sodium cellulosate 1-3 part.
2. use wilkinite according to the described pelletizing of claim 1, it is characterized in that, the weight part of each component is: 3 parts of 100 parts of wilkinites, 5 parts of industrial soda, ether of cellulose or sodium cellulosates.
3. use wilkinite according to the described pelletizing of claim 1, it is characterized in that, the weight part of each component is: 1 part of 90 parts of wilkinites, 3 parts of industrial soda, ether of cellulose or sodium cellulosate.
4. use wilkinite according to claim 1 or 2 or 3 described pelletizings, it is characterized in that: described industrial soda is industrial monohydrate or industrial sodium hydroxide.
5. use wilkinite according to claim 1 or 2 or 3 described pelletizings, it is characterized in that: described wilkinite is a sodium bentonite.
6. use wilkinite according to the described pelletizing of claim 5, it is characterized in that: described sodium bentonite is a smectite content greater than 55% sodium bentonite.
7. one kind prepares any one said pelletizing of claim 1-6 and uses bentonitic method, comprising:
(1) wilkinite is pulverized;
(2) toward the industrial soda that in the wilkinite of pulverizing, adds 3-5 part weight part of 90-100 part weight part;
(3) two kinds of material are mixed;
(4) compound is squeezed into piece;
The piece stockpile that (5) will be squeezed into is put and was accomplished sodium in 15-20 days;
(6) the piece material that will accomplish sodium carried out natural airing 5-15 days;
(7) the piece material that will accomplish natural airing carries out warm air drying, makes moisture reach weight percent below 12%;
(8) with addition of the ether of cellulose or the sodium cellulosate of 1-3 part weight part, stir;
(9) through grinding to form 1200-1500 purpose particle, promptly get.
8. any one said pelletizing of claim 1-6 is with the application of wilkinite in blast furnace ironmaking; Comprise: said pelletizing is mixed with the part by weight of the smart powder of wilkinite and iron according to 2-4:1000; Add moisture after stirring, adopt disk or drum pelletizer to cause green-ball; The green-ball of making is adopted conventional rotary kiln pelletizing method or the preheating of shaft furnace pelletizing method, calcining and cooling, get the finished ball nodulizing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110149924 CN102816926A (en) | 2011-06-07 | 2011-06-07 | Bentonite used for pellets, and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110149924 CN102816926A (en) | 2011-06-07 | 2011-06-07 | Bentonite used for pellets, and preparation method thereof |
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| CN102816926A true CN102816926A (en) | 2012-12-12 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102353760A (en) * | 2011-03-22 | 2012-02-15 | 马鞍山钢铁股份有限公司 | On-site rapid detection method and apparatus for bentonite quality |
| CN103922356A (en) * | 2014-03-26 | 2014-07-16 | 芜湖恒杰膨润土科技有限公司 | Preparation technology of composite bentonite |
| CN108588409A (en) * | 2018-01-09 | 2018-09-28 | 辽宁工程技术大学 | A kind of floating tail-coal base metallurgical briquetting binder and preparation method thereof |
| CN114635036A (en) * | 2022-02-24 | 2022-06-17 | 包头钢铁（集团）有限责任公司 | Method for establishing bentonite index and particle size composition of mixed iron material for iron ore pellet preparation |
-
2011
- 2011-06-07 CN CN 201110149924 patent/CN102816926A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102353760A (en) * | 2011-03-22 | 2012-02-15 | 马鞍山钢铁股份有限公司 | On-site rapid detection method and apparatus for bentonite quality |
| CN102353760B (en) * | 2011-03-22 | 2014-06-11 | 马鞍山钢铁股份有限公司 | On-site rapid detection method and apparatus for bentonite quality |
| CN103922356A (en) * | 2014-03-26 | 2014-07-16 | 芜湖恒杰膨润土科技有限公司 | Preparation technology of composite bentonite |
| CN108588409A (en) * | 2018-01-09 | 2018-09-28 | 辽宁工程技术大学 | A kind of floating tail-coal base metallurgical briquetting binder and preparation method thereof |
| CN108588409B (en) * | 2018-01-09 | 2019-07-09 | 辽宁工程技术大学 | A kind of floating tail-coal base metallurgical briquetting binder and preparation method thereof |
| CN114635036A (en) * | 2022-02-24 | 2022-06-17 | 包头钢铁（集团）有限责任公司 | Method for establishing bentonite index and particle size composition of mixed iron material for iron ore pellet preparation |
| CN114635036B (en) * | 2022-02-24 | 2024-01-30 | 包头钢铁（集团）有限责任公司 | Method for establishing bentonite index and mixed iron material granularity composition for preparing iron ore pellets |
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Application publication date: 20121212 |