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Ferric oxide pellets and preparation method and application thereof

A technology of iron oxide and pellets, which is applied in the field of iron oxide pellets and its preparation, can solve the problems of reducing the gas permeability index in the sintering process, reducing the quality of sintered ore, and poor gas permeability, so as to reduce the amount of dust generated and reduce the cost , good drop strength effect

Inactive Publication Date: 2019-04-26
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0007] An object of the present invention is to provide a method for preparing iron oxide pellets, aiming at reducing the gas permeability of the sintering process due to poor agglomeration and poor air permeability in the sintering process currently used as sintering raw materials for cold-rolled iron oxide powder and hot-rolled iron oxide scale slag Index, and reduced the quality of sintered ore resulting in poor economical problems, the present invention uses cold-rolled iron oxide powder, hot-rolled iron oxide scale slag and water-soluble organic binder as the main raw materials, the ball press machine as the main equipment, through drying, batching Premixing, adding binder, wet mixing, extrusion molding, and drying process to make iron oxide pellets with fixed size and certain drop strength

Method used

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  • Ferric oxide pellets and preparation method and application thereof
  • Ferric oxide pellets and preparation method and application thereof
  • Ferric oxide pellets and preparation method and application thereof

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preparation example Construction

[0033] A preparation method of iron oxide pellets, comprising the following steps:

[0034] (a) drying iron oxide scale slag, and then mixing with iron oxide powder;

[0035] Preferably, the iron oxide scale slag is dried to a moisture content of less than 13%, more preferably less than 10%;

[0036] The iron oxide scales are dried to a typical but non-limiting moisture content of 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11% or 12%.

[0037] Due to the relatively high moisture content of the initial iron oxide scale slag (9-25%), in order to ensure the normal development of dry mixing of ingredients in the subsequent process, it is necessary to reduce the moisture by airing or other drying methods until the binder can be evenly distributed after dry mixing of ingredients. In the present invention, the iron oxide scale dross is dried until the water content is less than 13%, which is beneficial to uniform mixing with the binder, and more preferably the iron oxide scale dregs a...

Embodiment 1

[0072] A preparation method of iron oxide pellets, comprising the following steps:

[0073] (a) Dry the iron oxide scale slag until the moisture is 10%, and then mix it with iron oxide powder for 4 minutes, and the mass ratio of iron oxide scale slag to iron oxide powder is 1:1;

[0074] (b) mix the mixed material in the step (a) with sodium carboxymethyl cellulose in a mixer in a mass ratio of 100:1.5, and the mixing time is 5min to obtain a dry mixed material;

[0075] (c) adding water to the dry-mixed mixture obtained in step (b) for wet mixing, the mass ratio of the dry-mixed mixture to water is 100:10, and the wet-mixed time is 5 minutes to obtain the wet-mixed mixture;

[0076] (d) the wet mixing mixture obtained in the step (c) is pressed by a universal testing machine into cylindrical pellets The pressure is 30MPa, and then through the pellet screening system, the pellets are transported to the drying process through a heat-resistant belt for high-temperature flue ga...

Embodiment 2

[0078] A preparation method of iron oxide pellets, comprising the following steps:

[0079] (a) Drying the iron oxide scale slag until the water content is less than 13%, and then mixing it with the iron oxide powder for 5 minutes, and the mass ratio of the iron oxide scale slag to the iron oxide powder is 4:1;

[0080] (b) Put the mixed material mixed in step (a) and polyacrylamide in a mixing mill (volume 2m) at a mass ratio of 100:0.8 3 , stirring capacity 1.2×10 3 kg / time) and mix uniformly, the mixing time is 8min, to obtain the dry blend mixture;

[0081] (c) adding water to the dry-mixed mixture obtained in step (b) for wet mixing, the mass ratio of the dry-mixed mixture to water is 100:12.5, and the wet-mixed time is 8 minutes to obtain the wet-mixed mixture;

[0082] (d) The wet mixed mixture obtained in step (c) is passed through a high-pressure ball press (oil cylinder pressure: 18Mpa, production capacity: 15×10 3 kg / h) to press round cake-shaped pellets (socket ...

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Abstract

The invention belongs to the technical field of comprehensive utilization of ferrous secondary resources and particularly relates to ferric oxide pellets and a preparation method and application thereof. The preparation method of the ferric oxide pellets comprises the following steps that (a) oxidized scale slag is dried and then mixed with ferric oxide powder; (b) a mixture obtained through mixing in the step (a) and a water-soluble organic bonding agent are subjected to dry blending, and a dry blending mixture is obtained; (c) water is added into the dry blending mixture obtained in the step(b), wet blending is performed, and a wet blending mixture is obtained; and (d) the wet blending mixture obtained in the step (c) is subjected to extrusion forming and drying in sequence, and then the ferric oxide pellets are obtained. The ferric oxide pellets obtained through the method have certain drop strength and can serve as a steelmaking coolant and / or a vanadium extraction coolant, the dust yield is decreased, and environment pollution is reduced.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of iron-containing secondary resources, in particular to an iron oxide pellet and its preparation method and application. Background technique [0002] In the production process of my country's metallurgical industry, the associated iron-containing secondary resources reach more than 10 million tons every year. The total iron content of these iron-containing secondary resources is generally between 30% and 70%. The conventional utilization method is to return to the steel production process. According to the different production processes returned, the utilization of iron-containing secondary resources mainly includes four methods: sintering method, pelletizing method, direct reduction method and cold-setting pelletizing method, among which cold-setting pelletizing method (the processing of iron-containing secondary resources is Chilled pellets are most commonly used as steelmaki...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/244C22B1/248
CPCC22B1/244C22B1/248
Inventor 李占军刘功国齐建玲秦洁
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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