CN101161830A - Deacidizing sintering process for powdered ore pulletizing - Google Patents
Deacidizing sintering process for powdered ore pulletizing Download PDFInfo
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- CN101161830A CN101161830A CNA2007100930585A CN200710093058A CN101161830A CN 101161830 A CN101161830 A CN 101161830A CN A2007100930585 A CNA2007100930585 A CN A2007100930585A CN 200710093058 A CN200710093058 A CN 200710093058A CN 101161830 A CN101161830 A CN 101161830A
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- deacidizing
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Abstract
The invention discloses a mineral powder granulating reduction roasting technics, which comprises granulating technics and roasting technics. The invention comprises the following steps: a. mineral powder with grain size being smaller than 15 mm is added with bentonite which is ranged from 5 percent to 7 percent according to weight percentage in the granulating technics; the mixture is mixed and stirred for 2 minutes to 5 minutes and then added with right amount of water and liquid polyethylene alcohol which is ranged from 0.8 percent to 1.3 percent; and granulation is performed after stirred for 3 to 7 minutes. b. mineral balls in step a is mixed with mineral lump with grain size being from 15 mm to 75 mm; the mineral ball is ranged from 20 percent to 40 percent according to weight percentage in the proportion of lump and ball; material is distributed and put into the stove for roasting with the roasting temperature ranged from 997 DEG C to 1026 DEG C. The negative pressure on the top of the roasting stove is from 300 Pa to 500 Pa. The invention adopts unique adhesive formulation and granulating roasting art. The phenomena of squeezing of mineral balls inside stove and dispersion due to heat expansion are less. The heat operating parameters of the roasting stove are stable and reach requirements of roasting technics. The invention makes full use of natural resource, reduces slag discharging cost, effectively controls pollution of mineral power to environment and saves production cost for enterprises.
Description
Technical field
The present invention relates to a kind of ore-dressing technique, particularly a kind of deacidizing sintering process for powdered ore pulletizing.
Background technology
In iron ore exploitation and ore dressing process, can produce the breeze of a large amount of granularities below 15mm.Along with the fast development of iron and steel enterprise, the generation of breeze also strengthens gradually.Lot of manpower and material resources is not only wasted in the accumulation of powdered iron ore, also environment is caused severe contamination.Simultaneously, the natural resources relative shortage now, a large amount of utilizations that contains powdered iron ore also is a problem demanding prompt solution.For solving this difficult problem, slope stove and rotary kiln reducing roasting commerical test were once done since the sixties by a lot of domestic Iron And Steel Companies.The slope stove since equipment typing still need and further work, imperfect and do not apply to industrial production as the data of design considerations; Rotary kiln falls brick and falls material delivering plate because of the leakage that exists gas line on the kiln body, kiln hood, the sealing of kiln tail, and problem such as ring formation applies to industrial production with also failing.
Particularly in some area of China, such as the Qijiang iron ore of Chongqing Iron ﹠ Steel Corp., iron ore is rhombohedral iron ore and spathic iron ore mixing ore deposit, and iron ore beneficiation difficulty itself is just high, utilizes difficulty higher for the powdered iron ore that produces.But, if a large amount of breezes does not utilize, not only produce processing costs, influence environment, waste natural resources, and for iron and steel enterprise, because the shortage of natural resources, enterprise's production cost also must not be irrespective problem.
Therefore, need a kind of breeze dressing technology that produces in exploitation and the ore dressing process of utilizing, make breeze can be used in smelting iron and steel, make full use of and save natural resources, effectively protect environment and save enterprise's production cost.
Summary of the invention
In view of this; the purpose of this invention is to provide a kind of deacidizing sintering process for powdered ore pulletizing; adopt unique prescription and technology; under the prerequisite of producing qualified roasting ore deposit ball product; make breeze can be used in smelting iron and steel; make full use of and save natural resources, effectively protect environment and save enterprise's production cost.
Deacidizing sintering process for powdered ore pulletizing of the present invention comprises pellet forming process and sinter process,
A. at first add the wilkinite of 5%-7% in the pellet forming process in less than the breeze of 15mm by weight percentage, stirred 2-5 minute, add the water of 3-5% and the liquid polyvinyl alcohol of 0.8-1.3%, stir and make ball after 3-7 minute in granularity;
B. the nugget that with ore deposit ball in a step and granularity is 15-75mm mixes, and piece ball ratio ore deposit ball by weight percentage accounts for 20-40%, and cloth is gone into the stove roasting, and maturing temperature is 997-1026 ℃, and stoving oven furnace roof negative pressure is 300-500Pa, roasting 8-12 hour.
Further, described wilkinite is a calcium-base bentonite;
Further, calcium-base bentonite 6% by weight percentage, liquid polyvinyl alcohol 1%, water 4%;
Further, in a step, the churning time behind the adding calcium-base bentonite 3 minutes, the churning time behind the adding liquid polyvinyl alcohol is 3-4 minute;
Further, the piece ball accounts for 20% than ore deposit ball by weight percentage;
Further, described maturing temperature is 1010 ℃, and stoving oven furnace roof negative pressure is 400Pa, roasting 11 hours;
Further, described stoving oven is a shaft furnace.
Beneficial effect of the present invention: deacidizing sintering process for powdered ore pulletizing of the present invention, adopt unique adhesive formula and make the ball sinter process, the ore deposit ball is squeezed in stove and thermal expansion and the phenomenon of diffusingization is little, stoving oven thermal technology operating parameters is stable, operation is normal, go into the average iron grade 40.17% of stove rawore ball, average scaling loss 13.12%, the average iron grade 45.63% of roasting ore deposit ball, remaining scaling loss 0.55% reaches the requirement of sinter process, do not have and drop down the generation of material phenomenon, the roasting ore deposit remaining scaling loss of ball reaches the quality product requirement, under the prerequisite of producing qualified roasting ore deposit ball product, makes breeze can be used in smelting iron and steel, make full use of and save natural resources, reduced the deslagging cost, and can effectively control the pollution of breeze, saved enterprise's production cost environment.
Embodiment
Embodiment one
The deacidizing sintering process for powdered ore pulletizing of present embodiment comprises pellet forming process and sinter process, it is characterized in that:
A. at first add 5% calcium-base bentonite in the pellet forming process in less than the breeze of 15mm by weight percentage, stirred 2 minutes, add 3% water and 0.8% liquid polyvinyl alcohol, stir and make ball after 3 minutes in granularity;
B. the nugget that with ore deposit ball in a step and granularity is 15-75mm mixes, and piece ball ratio ore deposit ball by weight percentage accounts for 20%, and cloth is gone into the stove roasting, and maturing temperature is 997 ℃, and stoving oven furnace roof negative pressure is 300Pa, roasting 8 hours.
Embodiment two
The deacidizing sintering process for powdered ore pulletizing of present embodiment comprises pellet forming process and sinter process, it is characterized in that:
A. at first add 5% calcium-base bentonite in the pellet forming process in less than the breeze of 15mm by weight percentage, stirred 3 minutes, add 4% water and 1% liquid polyvinyl alcohol, stir and make ball after 4 minutes in granularity;
B. the nugget that with ore deposit ball in a step and granularity is 15-75mm mixes, and piece ball ratio ore deposit ball by weight percentage accounts for 30%, and cloth is gone into the stove roasting, and maturing temperature is 1010 ℃, and stoving oven furnace roof negative pressure is 400Pa, roasting 11 hours.
Embodiment three
The deacidizing sintering process for powdered ore pulletizing of present embodiment comprises pellet forming process and sinter process, it is characterized in that:
A. at first add 7% calcium-base bentonite in the pellet forming process in less than the breeze of 15mm by weight percentage, stirred 4 minutes, add 5% water and 1.3% liquid polyvinyl alcohol, stir and make ball after 7 minutes in granularity;
B. the nugget that with ore deposit ball in a step and granularity is 15-75mm mixes, and piece ball ratio ore deposit ball by weight percentage accounts for 40%, and cloth is gone into the stove roasting, and maturing temperature is 1020 ℃, and stoving oven furnace roof negative pressure is 500Pa, roasting 12 hours.
Embodiment four
The deacidizing sintering process for powdered ore pulletizing of present embodiment comprises pellet forming process and sinter process, it is characterized in that:
A. at first add 6% calcium-base bentonite in the pellet forming process in less than the breeze of 15mm by weight percentage, stirred 2 minutes, add 3% water and 1% liquid polyvinyl alcohol, stir and make ball after 3.5 minutes in granularity;
B. the nugget that with ore deposit ball in a step and granularity is 15-75mm mixes, and piece ball ratio ore deposit ball by weight percentage accounts for 20%, and cloth is gone into the stove roasting, and maturing temperature is 1010 ℃, and stoving oven furnace roof negative pressure is 400Pa, roasting 11 hours.
Embodiment five
The deacidizing sintering process for powdered ore pulletizing of present embodiment comprises pellet forming process and sinter process, it is characterized in that:
A. at first add 5% sodium bentonite in the pellet forming process in less than the breeze of 15mm by weight percentage, stirred 2 minutes, add 3% water and 1% liquid polyvinyl alcohol, stir and make ball after 3 minutes in granularity;
B. the nugget that with ore deposit ball in a step and granularity is 15-75mm mixes, and piece ball ratio ore deposit ball by weight percentage accounts for 20%, and cloth is gone into the stove roasting, and maturing temperature is 1010 ℃, and stoving oven furnace roof negative pressure is 500Pa, roasting 8 hours.
Embodiment six
The deacidizing sintering process for powdered ore pulletizing of present embodiment comprises pellet forming process and sinter process, it is characterized in that:
A. at first add 6% sodium bentonite in the pellet forming process in less than the breeze of 15mm by weight percentage, stirred 3 minutes, add 4% water and 1% liquid polyvinyl alcohol, stir and make ball after 4 minutes in granularity;
B. the nugget that with ore deposit ball in a step and granularity is 15-75mm mixes, and piece ball ratio ore deposit ball by weight percentage accounts for 30%, and cloth is gone into the stove roasting, and maturing temperature is 1020 ℃, and stoving oven furnace roof negative pressure is 480Pa, roasting 11 hours.
Embodiment seven
The deacidizing sintering process for powdered ore pulletizing of present embodiment comprises pellet forming process and sinter process, it is characterized in that:
A. at first add 7% sodium bentonite in the pellet forming process in less than the breeze of 15mm by weight percentage, stirred 3 minutes, add 5% water and 1.3% liquid polyvinyl alcohol, stir and make ball after 5 minutes in granularity;
B. the nugget that with ore deposit ball in a step and granularity is 15-75mm mixes, and piece ball ratio ore deposit ball by weight percentage accounts for 40%, and cloth is gone into the stove roasting, and maturing temperature is 1020 ℃, and stoving oven furnace roof negative pressure is 500Pa, roasting 12 hours.
Embodiment eight
The deacidizing sintering process for powdered ore pulletizing of present embodiment comprises pellet forming process and sinter process, it is characterized in that:
A. at first add 5% sodium bentonite in the pellet forming process in less than the breeze of 15mm by weight percentage, stirred 2 minutes, add 4% water and 1% liquid polyvinyl alcohol, stir and make ball after 4 minutes in granularity;
B. the nugget that with ore deposit ball in a step and granularity is 15-75mm mixes, and piece ball ratio ore deposit ball by weight percentage accounts for 20%, and cloth is gone into the stove roasting, and maturing temperature is 1020 ℃, and stoving oven furnace roof negative pressure is 500Pa, roasting 10 hours.
Above embodiment or in production operation, preferred calcium-base bentonite is a raw material, and preferred proportion is a calcium-base bentonite 6%, and liquid polyvinyl alcohol 1% is economically with technical the most reasonable.
Explanation is at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can carry out the modification in the parameter area or be equal to replacement technical scheme of the present invention, and not breaking away from the aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (7)
1. a deacidizing sintering process for powdered ore pulletizing comprises pellet forming process and sinter process, it is characterized in that:
A. at first add the wilkinite of 5%-7% in the pellet forming process in less than the breeze of 15mm by weight percentage, stirred 2-5 minute, add the water of 3-5% and the liquid polyvinyl alcohol of 0.8-1.3%, stir and make ball after 3-7 minute in granularity;
B. the nugget that with ore deposit ball in a step and granularity is 15-75mm mixes, and piece ball ratio ore deposit ball by weight percentage accounts for 20-40%, and cloth is gone into the stove roasting, and maturing temperature is 997-1026 ℃, and stoving oven furnace roof negative pressure is 300-500Pa, roasting 8-12 hour.
2. deacidizing sintering process for powdered ore pulletizing according to claim 1 is characterized in that: described wilkinite is a calcium-base bentonite.
3. deacidizing sintering process for powdered ore pulletizing according to claim 2 is characterized in that: calcium-base bentonite 6% by weight percentage, liquid polyvinyl alcohol 1%, the water of adding 4%.
4. deacidizing sintering process for powdered ore pulletizing according to claim 3 is characterized in that: in a step, and the churning time behind the adding calcium-base bentonite 3 minutes, the churning time behind the adding liquid polyvinyl alcohol is 3-4 minute.
5. deacidizing sintering process for powdered ore pulletizing according to claim 4 is characterized in that: piece ball ratio ore deposit ball by weight percentage accounts for 20%.
6. deacidizing sintering process for powdered ore pulletizing according to claim 5 is characterized in that: described maturing temperature is 1010 ℃, and stoving oven furnace roof negative pressure is 400Pa, roasting 11 hours.
7. deacidizing sintering process for powdered ore pulletizing according to claim 6 is characterized in that: described stoving oven is a shaft furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100930585A CN100535138C (en) | 2007-11-27 | 2007-11-27 | Deacidizing sintering process for powdered ore pulletizing |
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| CNB2007100930585A CN100535138C (en) | 2007-11-27 | 2007-11-27 | Deacidizing sintering process for powdered ore pulletizing |
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| CN101161830A true CN101161830A (en) | 2008-04-16 |
| CN100535138C CN100535138C (en) | 2009-09-02 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102776363A (en) * | 2012-08-21 | 2012-11-14 | 中国科学院青海盐湖研究所 | Process for balling by mixing 200 meshes of celestite mineral powders and reduction coals |
| CN110155970A (en) * | 2019-06-12 | 2019-08-23 | 攀枝花学院 | Phosphorus ore micro mist pelletizing and preparation method thereof |
-
2007
- 2007-11-27 CN CNB2007100930585A patent/CN100535138C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102776363A (en) * | 2012-08-21 | 2012-11-14 | 中国科学院青海盐湖研究所 | Process for balling by mixing 200 meshes of celestite mineral powders and reduction coals |
| CN102776363B (en) * | 2012-08-21 | 2014-06-18 | 中国科学院青海盐湖研究所 | Process for balling by mixing 200 meshes of celestite mineral powders and reduction coals |
| CN110155970A (en) * | 2019-06-12 | 2019-08-23 | 攀枝花学院 | Phosphorus ore micro mist pelletizing and preparation method thereof |
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| Publication number | Publication date |
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| CN100535138C (en) | 2009-09-02 |
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