The attack of alumina-containing steelmaking slags on magnesite brick

Present day steelmaking slags are being successfully used as a high quality mineral aggregate for the building industry. With this, it is of vital importance to be familiar with the technical significance of the secondary application of steel slag, because some steel slag might contain increased concentration of substances harmful to human health. In terms of steel slag impact on the environment, radionuclides are the least researched of all pollutants emitted from the metallurgical processes. This work presents the preliminary study about the presence of the uranium in siderurgy slag aggregates for the purpose of its use in the production of construction material. The results showed that this slag is free of uranium which brings greater security in its use as building material.

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Efficient Autoclaved Silicate Concretes with the Use of Steelmaking Slag

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.284.956 ◽

2018 ◽

Vol 284 ◽

pp. 956-962 ◽

Cited By ~ 1

Author(s):

Yu.L. Starostina ◽

O.A. Plotnikova

Keyword(s):

Calcium Silicate ◽

Control Sample ◽

Steelmaking Slag ◽

Dry Milling ◽

Disposal Area ◽

Twofold Increase ◽

Steelmaking Slags ◽

Calcium Silicate Hydrates ◽

Crystallization Degree ◽

Silicate Materials

The article presents the findings of the research concerning the usage of slowly cooled crystallized steelmaking slags, taken from slag disposal area, in the raw mix for autoclaved silicate materials. By means of dry milling and with the use of this slag the slag-containing binders of various compositions and basicity were prepared. The application of steelmaking slags in the raw mix allows intensifying the process of new formations synthesis and increasing the amount and crystallization degree of low-basic calcium silicate hydrates of the tobermorite group, which provides more than twofold increase of strength characteristics of the obtained materials as compared to the control sample.

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Additions of Salt Cake and KAlF4 from Aluminum Production to Steelmaking Slags

High Temperature Materials and Processes ◽

10.1515/htmp-2012-0090 ◽

2012 ◽

Vol 31 (4-5) ◽

pp. 529-537

Author(s):

G.A. Sweet ◽

S. Ferenczy ◽

W.F. Caley ◽

G.J. Kipouros

Keyword(s):

Raw Materials ◽

Aluminum Production ◽

Secondary Aluminum ◽

Promising Alternative ◽

Salt Cake ◽

Steelmaking Slags ◽

Alternative Means ◽

Temperature Operating ◽

Plant Trials

AbstractFluorspar, a mineral primarily composed of CaF2 is the most commonly used slag fluidizer in steelmaking. Due to increasing costs for fluorspar steelmakers are seeking alternative means of achieving slag fluidity. The research has concentrated on other minerals or the wastes of other high temperature operating industries. A promising alternative to fluorspar has been identified in a previous work from this laboratory which is the salt cake from secondary aluminum production such as the flux in remelting aluminum scrap and dross. This material is widely available and also considered toxic (meaning that use in steelmaking helps to reduce environmental impacts from disposal). The present work is an investigation of the viability of using mixtures of salt cake and KAlF4 in slag-fluidizing applications by measurements of viscosity and weight loss at high temperatures (to evaluate whether large amounts of potentially harmful gases are formed). In addition, characterization of raw materials and melted slags has been performed. In terms of fluidity the mixtures of aluminum salt cake and KAlF4 are qualified for use as fluidizers. The results of the present study will be used to design plant trials.

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