CN101298079A - Environmental protection process method of desulfurizing slag of hot metal - Google Patents

Abstract

The invention relates to an environment-friendly processing method for removing sulfur slag from molten iron, which is characterized in that: (A) the method for removing sulfur slag from molten iron adopts simple heavy-hammer crushing after the watering dust precipitation process and then separating screen; (B) the screened slag of big size enters an autogeneous grinding system of an autogeneous mill; after autogenous grinding, the slag is screened and magnetically separated; a part of slag which contains iron and is larger than 5 cm is recycled and utilized as raw materials for metallurgy; (C) another part of slag which is smaller than 5 cm, together with the sulfur slag screened at the first time, enters a wet ball mill and is ball milled, screened and magnetically separated so as to separate the slag from the iron, thereby reducing the sulfur content in the iron products to 0.5 percent; the products which is rich in iron after magnetic separation are utilized by a sintering burden system; (D) the tailing slag after magnetic separation can be utilized by a cement burden system. The processing method of the invention has the advantages of good watering effect, no formation of flying dust, having the sulfur content being reduced to be less than 0.5 percent, increasing the added value of the products and being able to recycle the tailing slag processed in the cement burden system.

Description

The method of desulfurizing slag of hot metal environmental protection treatment

Technical field

The present invention relates to metallurgical technology field, especially a kind of method of desulfurizing slag of hot metal environmental protection treatment.

Background technology

Desulfurizing slag of hot metal is the new product of sulfur removal technology, and is various to the desulfurizing iron residues processing technique both at home and abroad, because its iron-holder height, the slag iron of bulk directly enters smelting system after the simple sorting, and the iron content desulphurizing slag powder of powdery enters the sintered material system.Because wherein sulfur-bearing ratio height is brought into sulphur again and smelts in the circulatory system, has influence on steel quality, forms vicious circle, desulfurizing iron technology loses meaning.Therefore, the technology of desulfurization slag processing and utilization is imperative.At present domestic existing enterprise directly adds the converter smelting system with the big clinker of desulfurizing slag of hot metal iron content and smelts, and causes that sulphur exceeds standard in the steel, has influenced the quality of steel; The enterprise that has adds the cupola furnace and smelts, because sulphur exceeds standard in the molten iron, also can only use as common low value-added foundry goods.The desulphurizing slag powder of iron content is used in sintered material, has brought harmful element sulphur again into to the plain circulation of iron, forms secondary pollution, has caused vicious circle.

Summary of the invention

The purpose of this invention is to provide a kind of to reducing airborne dust in the desulfurizing slag of hot metal processing procedure, removing the method for the environmental protection treatment that objectionable impurities element sulphur in the rich iron product and discarded tailings product obtain recycling.Realize that technical scheme of the present invention is: adopt the depositing dust crushing and screening mode of fetching water, avoid forming airborne dust; Bulk slag after the screening adopts autogenous tumbling mill autogenous grinding system handles, and sieve ground-slag down adopts the sorting of wet ball-milling system, and slag iron separates, and sulfur content is reduced to 0.5% in the iron product; The tailings that produces is as the cement ingredient utilization.

Beneficial technical effects of the present invention is: it is effective to sprinkle water, do not form airborne dust, sulfur content in the product is reduced to below 0.5%, improved its value-added content of product, the tailings after the processing, recycling in cement ingredient, with its all over products resource he, accomplished " eating dried bleeding, the refuse zero-emission ", society and environmental benefit are remarkable.

The specific embodiment

The present invention will be further described with reference to embodiment, and the method for desulfurizing slag of hot metal environmental protection treatment of the present invention is as follows:

(A), desulfurizing slag of hot metal carries out simple weight fragmentation after adopting the depositing dust of fetching water, screening choosing then;

(B), the bulk slag enters autogenous tumbling mill from grinding system on the sieve, through screening, magnetic separation after the autogenous grinding, the magnetic separation iron content is recycled as raw materials for metallurgy greater than the 5cm part;

(C), less than 5cm part and for the first time screening sieve desulfurizing slag of hot metal down enter wet ball mill ball milling, magnetic separation sorting, slag iron separates, sulfur content is reduced to 0.5% in the iron product, magnetic separation richness iron product can be used as the utilization of sintered material system;

(D), the part of the tailings after the magnetic separation is utilized as the cement ingredient system.

Claims (1)

1, a kind of method of desulfurizing slag of hot metal environmental protection treatment is characterized in that:

(A), desulfurizing slag of hot metal carries out simple weight fragmentation after adopting the depositing dust of fetching water, screening choosing then;

(B), the bulk slag enters autogenous tumbling mill from grinding system on the sieve, through screening, magnetic separation after the autogenous grinding, the magnetic separation iron content is recycled as raw materials for metallurgy greater than the 5cm part;

(C), less than 5cm part and for the first time screening sieve desulfurizing slag of hot metal down enter wet ball mill ball milling, magnetic separation sorting, slag iron separates, sulfur content is reduced to 0.5% in the iron product, magnetic separation richness iron product can be used as the utilization of sintered material system;

(D), the part of the tailings after the magnetic separation is utilized as the cement ingredient system.