CN102605177A - Wet open-circuit mix grinding process of pellet raw materials - Google Patents
Wet open-circuit mix grinding process of pellet raw materials Download PDFInfo
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- CN102605177A CN102605177A CN201210097619XA CN201210097619A CN102605177A CN 102605177 A CN102605177 A CN 102605177A CN 201210097619X A CN201210097619X A CN 201210097619XA CN 201210097619 A CN201210097619 A CN 201210097619A CN 102605177 A CN102605177 A CN 102605177A
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Abstract
The invention relates to a wet open-circuit mix grinding process of pellet raw materials, belonging to the technical field of processing of blast furnace pellet and DRI (direct reduced iron) pellet raw materials. The process comprises the following steps: compounding the pellet raw materials including iron ore powders, a flux, a fuel-burdened material, and wastes from steel works according to a certain weight; feeding the mixture into an overflow ball mill; then flowing milled ore pulp into a pump box, and pumping into a agitating tank through a variable frequency pump; and transferring the ore pulp from the agitating tank into an ore pulp distributer of a filter by a slurry pump and feeding into the filter for filtering by control of the ore pulp distributer. The water added to a production process can be recycled and the process is automatically controlled. The open-circuit mix grinding process of the pellet raw materials, provided by the invention, has the advantages of simplifying the procedures and saving space and investment, and moreover, the pellet raw materials are pre-mixed, so that the use amount of adhesive is reduced, and the pelletizing effect is improved.
Description
Technical field
The invention belongs to blast furnace pelletizing and DRI pellet feed processing technology field, a kind of pellet feed open circuit wet type mix grinding technology particularly is provided, can reduce the pellet feed granularity.
Background technology
Along with the increase of pelletizing ratio in the blast furnace burden, the basicity of pelletizing also must improve, and must add a part of flux in the raw material of pelletizing.The now new iron material of going up pellet production line is main with rhombohedral iron ore, for porosity and the reductibility that increases finished pellet, reduces the operating temperature of total fuel consumption, grate plate and the power consumption of blower fan, generally in pellet feed with addition of small amount of fuel.The waste material of comprehensive steel mill generally also adds in the pellet formation as raw material.Domestic general employing ball mill is opened a way to powdered iron ore separately or closed circuit grinding at present, adopts vertical mill separately to produce ground flux, fuel powder respectively, and technical process is complicated, floor space is big, investment is big, device category is many, the management amount is big.Flux, the fuel that adopts vertical mill to produce is water ratio less than 1% dry powder, and moisture enters atmosphere in the drying process, and corresponding production water consumption increases, and airborne dust is big in the blending process, and the humidification effect is bad during mixing, can exert an influence to making ball.
Summary of the invention
The object of the present invention is to provide a kind of pellet feed open circuit wet type mix grinding technology, saved floor space, reduced plant investment, reduced operative employee's quantity, avoided flux in the blending process, in join the airborne dust of fuel.
The present invention includes following steps:
Powdered iron ore, flux, in join pellet feeds such as fuel and steel mill's waste material and at first prepare burden; The compound for preparing feeds in the overflow ball mill; The ore pulp that mill is good flows in the pump box to be delivered in the steel basin through variable frequency pump again; Ore pulp is transported in the filter pulp distributor through the slag stock pump in the steel basin, feeds in the filter through pulp distributor control and filters.The water cycle that production process adds is used, and technological process adopts control automatically, and the technical parameter of control is:
The powdered iron ore granularity accounts for 40-80 weight % for-0.074mm sieve, flux, in join fuel and steel mill's waste material granularity all less than 3mm.Flux is generally one or both in Wingdale and the rhombspar, in join fuel and be generally in hard coal, refinery coke, the coke powder one or more, steel mill's waste material is generally one or more in high furnace dust mud, steel making dust slime, the roll scale.
Prepare back powdered iron ore, flux, in join fuel and steel mill's waste material etc. compound adopt overflow ball mill to carry out mix grinding, ore grinding ore pulp weight concentration is 65-80% in the ball mill, the finished product granularity accounts for 80-98 weight % for-0.043mm sieve.
The present invention through with powdered iron ore, flux, in join fuel and steel mill's waste material is put into ball mill mix grinding together because only adopt ball mill as grinding attachment, saved separately for flux, in join the equipment of fuel powder process; Save floor space, reduced plant investment, reduced operative employee's quantity; Avoided flux in the blending process, in join the airborne dust of fuel; And in grinding process, played the blended effect, can reduce the sticker consumption, improved the agglomeration effect.
Description of drawings
Fig. 1 is a process flow sheet of the present invention
Fig. 2 is the processing unit schema of instance of the present invention.Wherein, 1# endless belt conveyor 1, automatic marble-feeder 2, constant feeder 3, ball mill 4, Weighing feeder 5, disk feeder 6, pump box 7, steel basin feeding pump 8,1# steel basin 9, filter feeding pump 10,1# pulp distributor 11,2# steel basin 12, filtrate pump 13, filtrate box 14, ceramic filter 15,2# pulp distributor 16,2# endless belt conveyor 17,3# endless belt conveyor 18.
Embodiment
Below will combine accompanying drawing and specific embodiment that the present invention is further specified.
The raw material open circuit wet type mix grinding technology that Fig. 2 adopts for certain pelletizing; Concrete technology is following: according to the material amount of setting; Powdered iron ore is through φ 2.5m disk feeder under the ore deposit 6 and B915mm Weighing feeder 5; Rhombspar, Wingdale, hard coal and steel mill's waste material are given to material on the B1000mm1# endless belt conveyor 3 through B762mm constant feeder 3 under the storehouse, feed φ 5.5m * 11m ball mill 4 then.Compound and water are worn into ore pulp after trommel screen enters pump box 7 after screening out broken steel ball in ball mill.Pump box 7 places establish two steel basin feeding pumps 8 ore pulp are pumped into 1# pulp distributor 11, feed φ 10m * 10m1# steel basin 9 or φ 10m * 10m2# steel basin 12 by 11 controls of 1# pulp distributor again.Steel basin feeding pump 8 adopts speed control by frequency variation, according to liquid level adjustment rotating speed in the pump box 7.Ore pulp is mixing, storage in 1# steel basin 9 and 2# steel basin 12, pumps into 2# pulp distributor 16 through two filter feeding pumps 10 that are located at the bottom then.2# pulp distributor 16 adjustment pneumavalve aperture is automatically delivered to 80m with ore pulp
2In the ceramic filter 15, to keep ceramic filter 15 liquid level stabilizings.Filter cake after the filtration is given on B800mm2# endless belt conveyor 17, the B800mm3# endless belt conveyor 18, is sent to next process then.Filtrate filtered flows in the filtrate box 14 through discrepancy in elevation discharge opeing, sends ball mill 4 back to through two filtrate pumps 13 again and uses with ceramic filter 15.
Claims (1)
1. pellet feed open circuit wet type mix grinding technology; It is characterized in that; Technical process may further comprise the steps: powdered iron ore, flux, in join pellet feeds such as fuel and steel mill's waste material and at first prepare burden, the compound for preparing feeds in the overflow ball mill, the ore pulp that mill is good flows in the pump box to be delivered in the steel basin through variable frequency pump again; Ore pulp is transported in the filter pulp distributor through the slag stock pump in the steel basin, feeds in the filter through pulp distributor control and filters; The technical parameter of control is:
The powdered iron ore granularity accounts for 40-80 weight % for-0.074mm sieve; Flux, in join fuel and steel mill's waste material granularity all less than 3mm; Flux is one or both in Wingdale and the rhombspar, in join in fuel hard coal, refinery coke, the coke powder one or more, steel mill's waste material is one or more in high furnace dust mud, steel making dust slime, the roll scale;
Prepare back powdered iron ore, flux, in join fuel and steel mill's waste material etc. compound adopt overflow ball mill to carry out mix grinding together, ore grinding ore pulp weight concentration is 65-80% in the ball mill, the finished product granularity accounts for 80-98 weight % for-0.043mm sieve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210097619XA CN102605177A (en) | 2012-04-01 | 2012-04-01 | Wet open-circuit mix grinding process of pellet raw materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210097619XA CN102605177A (en) | 2012-04-01 | 2012-04-01 | Wet open-circuit mix grinding process of pellet raw materials |
Publications (1)
| Publication Number | Publication Date |
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| CN102605177A true CN102605177A (en) | 2012-07-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210097619XA Pending CN102605177A (en) | 2012-04-01 | 2012-04-01 | Wet open-circuit mix grinding process of pellet raw materials |
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| CN (1) | CN102605177A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103468938A (en) * | 2013-09-04 | 2013-12-25 | 鞍钢集团矿业公司 | Method for improving uniformity of iron material in pellets |
| CN114480837A (en) * | 2021-12-30 | 2022-05-13 | 海宁市现代汽车座套有限公司 | Sintering recovery device and process for industrial metal waste |
-
2012
- 2012-04-01 CN CN201210097619XA patent/CN102605177A/en active Pending
Non-Patent Citations (2)
| Title |
|---|
| 中南矿冶学院编辑编: "《国外链篦机——回转窑氧化球团译文集第4集[下]》", 30 June 1980, 四川省渡口市科学技术情报研究所 * |
| 傅菊英等编: "《烧结球团学》", 29 February 1996, 中南工业大学出版社 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103468938A (en) * | 2013-09-04 | 2013-12-25 | 鞍钢集团矿业公司 | Method for improving uniformity of iron material in pellets |
| CN103468938B (en) * | 2013-09-04 | 2015-01-07 | 鞍钢集团矿业公司 | Method for improving uniformity of iron material in pellets |
| CN114480837A (en) * | 2021-12-30 | 2022-05-13 | 海宁市现代汽车座套有限公司 | Sintering recovery device and process for industrial metal waste |
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Application publication date: 20120725 |