Flux pellet with low expansion rate as well as preparation method and application thereof
By adding ultrafine magnesium hydroxide and calcium oxide to the pellet ore to form mafic ore, the problem of high expansion rate of the pellet ore is solved, and the smelting effect is achieved with low expansion rate and low cost.
CN120555731APending Publication Date: 2025-08-29ZHANGJIAKOU XUANHUA JINSHICHENG DOLOMITE DEV CO LTD
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Patent Information
- Application Number
- CN202510835645.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-20
- Publication Date
- 2025-08-29
AI Technical Summary
Technical Problem
In the prior art, the expansion rate of the pellet ore is high, which affects the antetraversion of blast furnace iron smelting, and it is difficult to effectively reduce the expansion rate by artificially added MgO.
Method used
Ultrafine magnesium hydroxide and calcium oxide separated from blast furnace slag are used to control the mass ratio of CaO/SiO2 to be greater than 1.0, and mafite (MgO·Fe2O3) is formed by roasting at 1250-1260°C, which plays a 'skeleton' role in the pellet and inhibits expansion.
Benefits of technology
Significantly reducing the expansion rate of pellet ore to less than 10%, which can greatly increase the amount of flux pellet ore added, reduce smelting costs and ensure the normal operation of the smelting furnace.
✦ Generated by Eureka AI based on patent content.
Abstract
The invention provides a fluxed pellet with a low expansion rate as well as a preparation method and application thereof, and relates to the field of fluxed pellet preparation. The material comprises the following raw materials: fine iron powder, superfine magnesium hydroxide separated from blast furnace slag and-200-mesh calcium oxide; wherein the mass ratio of Ca0 to SiO2 is greater than 1.0, and MgOgt is used as a raw material; and 2.5%. The preparation method comprises the following steps: uniformly mixing fine iron powder, magnesium hydroxide and calcium oxide, and feeding the mixture into a pelletizing system to form 10-16mm pellets; and drying and preheating the made pellets, then roasting the pellets at the temperature of 1250-1260 DEG C, and then soaking and cooling the pellets to obtain the fluxed pellets. The expansion rate of the pellet is smaller than 10%, a large amount of pellet can be put into an iron smelting furnace, and the smelting cost is reduced.
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