Method for quickly testing appropriate granulation moisture content of iron ore sinter mixture

Abstract

The invention discloses a method for quickly testing the appropriate granulation moisture content of an iron ore sinter mixture. The appropriate granulation moisture content refers to the moisture content required by the granulated mixture for obtaining optimal breathability. The moisture includes the moisture of the raw materials and the added water during mixing and granulation. The method comprises the following steps: 1) preparing a slurry mixture of which the humidity is 10 to 20 percent from iron ore, solvent, coke powder and sinter return ore; 2) rinsing and sieving the mixture by using saturated lime water as a medium, obtaining adhesive powder and shell grains and testing the content Xa of the adhesive powder; 3) testing the inner hole water-holding capacity of the shell grains by centrifugation; 4) testing the saturated water-holding capacity of the adhesive poser by using saturated water absorption process; and 5) calculating the appropriate moisture content required for the granulation of the mixture according to a formula. The method has the characteristics of simple operation and high accuracy. Based on an absolute error range from -0.3 to +0.3, the accuracy of the prediction of the appropriate moisture content reaches 93.3 percent according to the results of the tests of the moisture content of mixtures prepared by 30 material mixing schemes.

Description

technical field [0001] The invention belongs to the technical field of agglomeration for the preparation of iron smelting raw materials, and relates to a method for detecting the moisture content of a mixture suitable for granulation in an iron ore sintering process. technical background [0002] Sintering is currently the most widely used method of agglomerating iron-containing raw materials in domestic and foreign iron and steel enterprises. Sintering is under the action of forced ventilation of the lower bellows, the fuel combustion in the material layer causes the mixture to be partially melted under the action of high temperature and consolidated into sinter. Therefore, the sintering process must supply air to the material layer to burn the fuel, and the flow of gas in the sintering material layer is related to the heat transfer, mass transfer and physical and chemical reactions of the sintering process, thus affecting the quality and energy consumption of sintered ore....

AI Technical Summary

Problems solved by technology

It specifically includes 5 steps including sample preparation, particle size classification, detection of water holding capacity in inner pores of nuclear particles, detection of saturated water holding capacity of adhering powder and calculation of suitable moisture.

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