Strength of iron-ore agglomerates during reduction |
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| Authors: | Birgitta Hässler |
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| Institution: | Mineral Processing Division, Royal Institute of Technology, Stockholm, Sweden |
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| Abstract: | The paper deals with the reduction strength of iron-ore agglomerates, especially under the conditions in the blast furnace. As an introduction, the reduction zones, temperature zones and pressures exerted on the charge are covered.Special attention has been paid to the reasons for the often very large decrease in strength during heating and reduction. The plasticity of the wüstite is, in this case, of special interest. A number of testing methods for investigation of stresses and strains of the agglomerates during reduction are introduced. The test methods cover different procedures in the blast furnace — isothermal as well as blast furnace simulating.A method of measuring the pressure strength during reduction has been worked out which comprises testing the agglomerates at high temperature during the reduction. It was originally developed in order to study the cold-bound balls during the reducing process. With the aid of this test method the necessary conditions were established for the development of perfect agglomerates according to the COBO method.A series of results from investigations made with these tests are given both for cold-bonded COBO balls of various compositions and for commercial types of burnt pellets. |
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