Sintering method of ferromanganese ore pellets

A sintering method and iron-manganese ore technology, which is applied in the field of metallurgy, can solve the problems that the sintering process of manganese ore is not significantly changed, and achieve the effects of improving thermal gas permeability, reducing moisture, and improving surface activity and reactivity

Active Publication Date: 2022-06-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the substantive changes in the manganese ore sintering process are not obvious

Method used

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  • Sintering method of ferromanganese ore pellets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The coarse-grained iron-manganese ore, limestone and returned ore are pretreated by roller crushing, ball milling and high-pressure roller milling until the particle size is less than 0.074mm, accounting for about 70%, and the specific surface area is 1575cm. 2 / g; then add bentonite, the amount of bentonite is 0.8% for mixing, and the alkalinity is controlled to 1.6%; the mixed material is pelletized, the pelletizing moisture is controlled to 8%, and the pelletizing time is 12min, and the compressive strength of the obtained green pellets is obtained. 11N / piece, drop strength 4.7 times / (0.5m), burst temperature 280℃, raw meal particle size 10-16mm, the green ball index meets or even exceeds industrial requirements; ; The mixed material is subjected to distribution, drying, ignition sintering, heat preservation, cooling, crushing and granulation to obtain the finished pellet sinter. The height of the material layer is 500mm; the drying temperature is 250°C, the drying t...

Embodiment 2

[0054] The coarse-grained iron-manganese ore, limestone and returned ore are pretreated by roller crushing - ball milling - high pressure roller milling, until the particle size is less than 0.074mm, accounting for about 70%, and the specific surface area is 1575cm 2 / g; then add bentonite, the amount of bentonite is 1.2% for mixing, and the alkalinity is controlled to 1.6; the mixed material is pelletized, the pelletizing moisture is controlled to 8%, the pelletizing time is 12min, and the compressive strength of the obtained green pellet is 12.3 N / piece, drop strength 5.1 times / (0.5m), burst temperature 320°C, raw meal particle size 10-16mm, the green ball index meets or even exceeds industrial requirements; ; The mixed material is subjected to distribution, drying, ignition sintering, heat preservation, cooling, crushing and granulation to obtain the finished pellet sinter. The height of the material layer is 750mm; the drying temperature is 300°C, the drying time is 3min; ...

Embodiment 3

[0057] The coarse-grained iron-manganese ore, limestone and returned ore are pretreated by roller crushing, ball milling and high-pressure roller milling until the particle size is less than 0.074mm, accounting for about 70%, and the specific surface area is 1575cm. 2 / g; then add bentonite, the amount of bentonite is 1.2% for mixing, and the alkalinity is controlled to 1.6; the mixed material is pelletized, the pelletizing moisture is controlled to 8%, the pelletizing time is 12min, and the compressive strength of the obtained green pellet is 12.3 N / piece, drop strength 5.1 times / (0.5m), burst temperature 320°C, raw meal particle size 10-16mm, the green ball index meets or even exceeds industrial requirements; ; The mixed material is subjected to distribution, drying, ignition sintering, heat preservation, cooling, crushing and granulation to obtain the finished pellet sinter. The height of the material layer is 1000mm; the drying temperature is 300°C, the drying time is 3min...

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Abstract

The sintering method comprises the following steps: S1, carrying out crushing and ball-milling treatment on coarse-grained ferromanganese ore, limestone and return mine, and then carrying out high-pressure roller milling to obtain a pretreated raw material; s2, after the pretreated raw materials are subjected to optimized ore blending, a binder is added and mixed uniformly, and a mixture is obtained; s3, pelletizing the mixture obtained in the step S2; s4, carrying out external rolling on the green pellets to obtain a solid fuel, so as to obtain a uniformly mixed material; and S5, distributing the uniformly mixed material, and then sequentially performing drying, ignition sintering, heat preservation, cooling, crushing and size stabilization to obtain finished pellets. In order to solve the problem that a liquid phase is difficult to form in the ferromanganese ore sintering process, a ball milling and high-pressure roller milling combined treatment process is utilized, the specific surface area of the ferromanganese ore is increased, the surface activity and reaction activity of the ferromanganese ore are improved, migration and activation of atoms in the high-temperature sintering process are promoted, the forming ability of a sintering liquid phase is improved, and the liquid phase amount is increased, so that the liquid phase consolidation effect of the ferromanganese ore is promoted; the sintering strength is improved.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for sintering iron-manganese ore pellets. Background technique [0002] Ferromanganese ore is a common low-grade complex iron ore resource. Due to the similar properties of iron and manganese, iron and manganese in the ore often coexist closely. Conventional beneficiation processes (such as gravity separation, electrical separation, flotation, magnetic separation or Combined process) is difficult to achieve separation of iron and manganese. At present, the more effective means is to smelt it in a blast furnace by agglomeration to produce manganese-rich slag, or through agglomeration, conduct electric furnace smelting to prepare ferromanganese alloy. Among them, sintering process is the main agglomeration method of iron-manganese ore. [0003] Although the sintering mechanism of manganese ore powder is basically the same as that of iron ore powder, compared with conve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/242C22B1/16C22B47/00B02C21/00
CPCC22B1/242C22B1/2406C22B1/16C22B47/00B02C21/00Y02P10/20
Inventor 潘建郭正启朱德庆杨聪聪李启厚刘伟
Owner CENT SOUTH UNIV
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