Use of stabilized EAFD as a raw material in the production of a

Details Use of stabilized EAFD as a raw material in the production of a Use of stabilized EAFD as a raw material in the production of a

1997-06-02

1998-12-29

Marcheschi, Michael

Compositions: coating or plastic

Coating or plastic compositions

Inorganic settable ingredient containing

106745, 106765, 106769, 106771, 588256, C04B 1806, C04B 1808, C04B 1814, C04B 736

Patent

active

058534741

ABSTRACT:
A method for producing portland cement includes adding stabilized electric arc furnace dust (EAFD) to the raw materials fed into the feed end of a rotary cement kiln to form a cement clinker. The untreated EAFD is preferably stabilized by forming a mixture of water, lime, and a cementitious reactant consisting of untreated electric arc furnace dust. Preferably, dolomitic lime is used and ferrous sulfate is added to the mixture. The stabilized EAFD, which is so soft that no grinding is necessary, may be nonetheless passed through the grinding mill along with the cement raw materials (excluding stabilized EAFD), combined with the raw materials after the raw materials are ground, or delivered directly to the rotary cement kiln in a stream separate from the cement raw materials. The stabilized EAFD serves as an inexpensive iron source in place of iron ore, mill scale, coal ash, or others. Preferably, the stabilized EAFD is added to the cement raw materials in an amount to provide an iron content of between 2%-5%, measured as iron oxide.

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