Method for improving strength and size composition of sinter

A technology of particle size composition and sintering, which is applied in the field of metallurgy, can solve the problems of sintering energy waste, increased powder return rate, and increased shipping costs, and achieve the effects of reduced solid fuel consumption, improved particle size composition, and increased drum strength

Inactive Publication Date: 2014-12-10
JIGANG GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The sinter produced in the sintering area is transported to the blast furnace through repeated transportation, not only the proportion of the particle size less than 5mm has increased, but also the proportion of the 5-10mm particle size has increased significantly; coupled with the current sinter screening equipment under the blast furnace tank They are all rod sieves. After being screened by the rod sieve, the powder return rate under the blast furnace tank will increase, which will not only increase the shipping cost, but also cause a waste of sintering energy.

Method used

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  • Method for improving strength and size composition of sinter

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Experimental program
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Embodiment 1

[0012] Embodiment 1 (the basicity value of sintered ore is CaO / SiO 2 for 1.8-2.0)

[0013] (1) Various iron ore powders: 6% rocket super powder, 10% Mauritania powder, 20% Canadian fine powder, 10% Brazilian high silicon powder, 30% Sierra Leone coarse powder, 2% recycled iron fine powder and sintered Mineral powder 22% is prepared in the pre-batching room of the raw material yard to make neutralizing material, and it is laid flat in the secondary material yard to build a pile. After the pile is closed, it is intercepted in the neutralizing material pile by a stacker-reclaimer, and transported to the sintering batching room through a belt;

[0014] (2) In the batching room, mix the neutralization material, coke powder, brucite fiber, calcium flux, and magnesium flux (see the test period in Table 1 for the specific ratio); add brucite fiber (SiO 2 34wt%, MgO23wt%, CaO22%), use electric vibration feeder to feed to ensure the accuracy of feeding;

[0015] Table 1 Sintering raw ...

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Abstract

The invention discloses a method for improving the strength and the size composition of a sinter. The method is characterized in that when fluxes are added in a dosing chamber, a brucite fiber accounting for 0.90-0.95 % of the total mass of a sintered material is also added besides a calcium flux and a magnesium flux; after dosing, the brucite fiber, the calcium flux, the magnesium flux, an iron material and fuel are thoroughly mixed, and then water is added to wet the material to be subjected to a sintering process. Under the situation that the neutralized material structure, the fuel ratio and the sinter basicity remain unchanged, the brucite fiber is added, the sintering time is shortened from the original 24.2min to 21.9min, the productivity is increased by 26.6%, the sinter tumbler strength is improved by 9.15%, the average sinter size composition is improved by 2.25mm, the sinter solid fuel is decreased by 8.91kg / t, and the economic benefits are obvious, and the popularization and application values are great.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a new method for increasing production and energy saving by increasing the strength of sintered ore, improving the particle size composition of sintered ore and increasing the average particle size of sintered ore. Background technique [0002] Sintered ore refers to a lumpy charge made by mixing iron ore powder with a certain amount of solid fuel (coke powder or anthracite) and flux and sintering. The production process of sintering ore is: after the iron ore powder, flux and solid fuel are mixed and granulated by the sintering batching machine and the cylinder mixer, they are distributed on the sintering trolley through the round roller distributor, and the sintering mixture is ignited by the igniter. , Negative pressure ventilation sintering to the end of sintering, and then the sintered ore is cooled to below 100°C by the single-roller crushing at the end of the machine, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/16
Inventor 李丙来刘振林曾凡辉谷民李真明刘继彬杨金福孔凡朔陈霞杨传举申爱民薛燕
Owner JIGANG GRP
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