阅读说明：本技术 一种改善厚料层烧结透气性的生产方法 (Production method for improving sintering permeability of thick material layer ) 是由 刘杰 周明顺 朱建伟 宫作岩 翟立委 张辉 徐礼兵 李建军 韩晓东 董刚 于 2019-09-30 设计创作，主要内容包括：本发明公开一种改善厚料层烧结透气性的生产方法,在进行厚料层烧结生产时,在烧结机布料前将至少1组支撑装置与台车运动方向垂直布置,支撑装置的高度为台车档板高度的1/3到4/5；所述支撑装置为2个以上支架,支架由若干个连接杆连接；所述支架成分按质量百分比为10％-25％烧结或高炉返矿,15％-25％炼钢转炉渣,5％-10％烧结除尘灰,5％-10％的细氧化铁粉和30％-55％水泥；随着烧结的进行,支架保持原有形状不变,在烧结机尾,支架同烧结矿一起破碎后经过冷却和筛分。(The invention discloses a production method for improving the sintering permeability of a thick material layer, wherein when the thick material layer sintering production is carried out, at least 1 group of supporting devices are vertically arranged with the moving direction of a trolley before the material distribution of a sintering machine, and the height of each supporting device is 1/3-4/5 of the height of a trolley baffle; the supporting device is more than 2 brackets which are connected by a plurality of connecting rods; the bracket comprises, by mass, 10-25% of sintered or blast furnace return ores, 15-25% of steelmaking converter slag, 5-10% of sintered dedusting ash, 5-10% of fine iron oxide powder and 30-55% of cement; the support keeps the original shape along with the sintering, and the support and the sintering ore are crushed together at the tail of the sintering machine and then are cooled and screened.)

1. A production method for improving the sintering permeability of a thick material layer is characterized by comprising the following steps: when thick material layer sintering production is carried out, at least 1 group of supporting devices are vertically arranged with the moving direction of the trolley before material distribution of a sintering machine, and the height of each supporting device is 1/3-4/5 of the height of a trolley baffle; the supporting device is more than 2 brackets which are connected by a plurality of connecting rods; the bracket comprises, by mass, 10-25% of sintered or blast furnace return ores, 15-25% of steelmaking converter slag, 5-10% of sintered dedusting ash, 5-10% of fine iron oxide powder and 30-55% of cement; the support keeps the original shape along with the sintering, and the support and the sintering ore are crushed together at the tail of the sintering machine and then are cooled and screened.

2. The production method for improving the sintering air permeability of the thick material layer according to claim 1, characterized in that: the support is of a trapezoidal table structure.

3. The production method for improving the sintering air permeability of the thick material layer according to claim 1, characterized in that: the connecting rod can be made of the same material as the bracket or made of a biomass material.

4. The production method for improving the sintering air permeability of the thick material layer according to claim 1, characterized in that: after the supporting device is sintered at high temperature, the components of the supporting device are 20-30 percent of iron content by mass percent, 1.9-3.0 times of binary alkalinity and 2.0-2.6 times of quaternary alkalinity, and the supporting device is made of calcium ferrite and calcium silicate minerals which can be directly connected into a blast furnace.

5. The production method for improving the sintering air permeability of the thick material layer according to claim 1, characterized in that: the thick material layer is more than 700mm in thickness.

6. The production method for improving the sintering air permeability of the thick material layer according to claim 1, characterized in that: the fine iron oxide powder has a particle size of less than 50 meshes and accounts for more than 80% of the mass percent.

Technical Field

The invention belongs to the field of ferrous metallurgy, relates to a sintering production method, and particularly relates to a production method for improving the sintering permeability of a thick material layer.

Background

With the progress of domestic iron-making technology, the thick-layer sintering is gradually accepted by the steel industry as a production mode which can improve the production efficiency, reduce the fuel consumption and improve the quality of sintered ores. However, with the increase of the thickness of the material layer, the sintering combustion zone and the over-wet zone are thickened, the weight of the upper sintering mixture is increased, the lower sintering mixture is gradually compacted, the air permeability of the lower part of the whole material layer is sharply reduced, the yield and the quality of sintering ores are seriously influenced, and the further increase of the thickness of the sintering material layer is limited.

Therefore, the key to realize the sintering of thick material layers and even ultra-high material layers is to solve the problem that the permeability of the material layer under the sintering is poor, and CN200910078993.3 introduces a sinter layer load reducing device, a sintering machine using the device and a sintering method, which are mainly characterized in that the sinter layer load reducing device comprises: a strip-shaped base configured to be installed at the bottom of the sintering pallet in parallel to the traveling direction of the sintering pallet; and a plurality of right trapezoid off-loading plates detachably mounted to the base in a longitudinal direction (length direction) of the base, wherein adjacent right trapezoid off-loading plates are not adjacent with a right-angled edge, respectively. Through actual production inspection, by using the method, the sintering support beams and the single-tooth roller height of the head and the tail of the sintering machine, a bed charge leveling device of the head and the like must be greatly improved, and the improvement cost is high; in addition, the load reducing device in the method is easy to lose, the replacement of the device needs to be stopped, the labor amount for maintenance and updating is large, and the cost is high; and the load reducing device per se occupies the space of the sintering mixture on the sintering trolley, and the output of the sintering ore is greatly reduced per se. In addition, methods such as JP2-293586, JP4-168234, JP5-43950, JP6-129775, JP6-323745 and the like which use a trapezoidal or rectangular sintered material layer load reducing plate to reduce the load of a material layer and thus improve the air permeability of the material layer have the defects of poor load reducing effect, easy damage, inconvenient replacement, high cost and the like, and cannot completely solve the negative effects of the supporting device.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a production method for improving the sintering air permeability of a thick material layer, which utilizes available materials of a blast furnace, a supporting device for supporting an upper material layer is arranged at the lower part of the material layer, so that the influence of the gravity of the upper part of the material layer on the lower part of the material layer is reduced to the minimum, the bulk density of the lower material layer is reduced, the air permeability of the lower material layer is improved, meanwhile, the supporting device is carried out along with sintering and finally directly enters the blast furnace for production as sintered ores, and a series of problems that when the traditional supporting device is utilized in sintering, the sintering machine needs to be greatly produced and modified, the supporting device is abraded, the installation cost is increased, and the like are thoroughly solved. Not only greatly improves the production quality of the sintering ore, but also effectively reduces the sintering production cost.

In order to achieve the purpose, the invention adopts the following technical scheme:

a production method for improving the sintering permeability of a thick material layer is characterized by comprising the following steps: when thick material layer sintering production is carried out, at least 1 group of supporting devices are vertically arranged with the moving direction of the trolley before material distribution of a sintering machine, and the height of each supporting device is 1/3-4/5 of the height of a trolley baffle; the supporting device is more than 2 brackets which are connected by a plurality of connecting rods; the bracket comprises, by mass, 10-25% of sintered or blast furnace return ores, 15-25% of steelmaking converter slag, 5-10% of sintered dedusting ash, 5-10% of fine iron oxide powder and 30-55% of cement; the support keeps the original shape along with the sintering, and the support and the sintering ore are crushed together at the tail of the sintering machine and then are cooled and screened.

The support is of a trapezoidal table structure.

The connecting rod can be made of the same material as the bracket or made of a biomass material.

After the supporting device is sintered at high temperature, the components of the supporting device are 20-30 percent of iron content by mass percent, 1.9-3.0 times of binary alkalinity and 2.0-2.6 times of quaternary alkalinity, and the supporting device is made of calcium ferrite and calcium silicate minerals which can be directly connected into a blast furnace.

The thick material layer is more than 700mm in thickness.

The fine iron oxide powder has a particle size of less than 50 meshes and accounts for more than 80% of the mass percent.

The invention has the beneficial effects that: the invention can thoroughly solve the problems that the speed of a sintering machine is slowed down and the quality of sintered mineral products is obviously reduced after the thickness of a sintered material layer reaches a certain degree. The supporting device is arranged at the lower part of the thick material layer, so that the gravity extrusion problem of the mixture at the lower part by the upper part can be effectively reduced, and the problem that the air permeability of the lower part of the material layer is poor and the thickness of the material layer is restricted to be improved is thoroughly solved. The supporting device is composed of a plurality of independent supports and is connected by biomass fuel, so that the supporting device can be stably placed on the trolley without being fixed on the trolley, the reconstruction cost of sintering is greatly saved, and no influence is caused on continuous sintering production. The unique material composition of the supporting device not only can not cause the phenomena of collapse, fracture and the like, but also can become a high-alkalinity blast furnace available material containing calcium ferrite and calcium silicate through the further high-temperature action of sintering. And the supporting device is completely bonded with the sintering ore at the tail of the sintering machine and enters a crushing, cooling and screening device to become a part of finished ore, thereby thoroughly solving the defect of a fixed support. Therefore, the production quality of the sintered ore is greatly improved, the production cost of sintering transformation, maintenance and the like is effectively reduced, and the method has extremely high popularization and application values and can be an effective measure for improving the thickness of the sintered material layer in the future.

Drawings

FIG. 1 is a schematic view of a supporting apparatus according to embodiment 1 of the present invention;

FIG. 2 is a side view of FIG. 1;

FIG. 3 is a schematic view of a supporting device according to embodiment 2 of the present invention;

wherein, 1 is a bracket, and 2 is a connecting rod.

Detailed Description

The following description is given with reference to specific examples: