Coal blending method for preparing high-activity high-strength coke

Abstract

The invention discloses a coal blending method for preparing high-activity high-strength coke. The coal blending method comprises a step of blending coking coal, wherein the coking coal participating in coal blending comprises the following components in percentage by weight: 20 to 70 percent of Xinjiang strongly caking coal, and the balance of one or a mixture of more of charred coal, lean coal,fat coal, gas coal and 1 / 3 charred coal; and after blending, the air-dried moisture is 1.0 to 1.7 percent, the dry basis ash is 8 to 12 percent, the dry basis volatile is 22 to 26 percent, the sulfurcontent is less than 0.6 percent, the caking index is 82-100, the maximum value of Gieseler fluidity is 1.9-3.0, the average value of vitrinite reflectance is 1.1 to 1.4 percent, and in the dry basisash, CaO is 10 to 15 percent, Fe2O3 is 9 to 15 percent and MgO is 3 to 5 percent. In the method, the strongly caking coal produced in Xinjiang and considered to be poor traditionally is effectively utilized, the advantages of high caking property, low ash, low sulfur, cheapness and high availability of the strongly caking coal are exerted, and the high-activity high-strength coke is produced at low cost for blast furnaces.

Description

technical field [0001] The invention relates to the technical field of coking coal blending, in particular to a coal blending method for preparing coke with high activity and high strength. Background technique [0002] In recent years, due to the introduction of the concept of high-activity high-strength coke, many people have begun to study its preparation method. The use of high-activity high-strength coke is of great significance to improve the reaction efficiency of blast furnaces. For a specific blast furnace, by improving the reactivity of coke, Accelerate the reduction of ore, thereby reducing the operating temperature of the blast furnace, ensuring that the coke still has a certain strength, and achieving energy conservation and environmental protection through changes in the operating temperature of the blast furnace. At present, there are three main methods to improve coke activity: 1) reduce the final coking temperature; 2) increase the proportion of coal wit...

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Problems solved by technology

All the above methods have their own disadvantages, such as reducing the strength of coke or increasing the production cost of coke. If the strength of coke must be increased to maintain the strength of strong coal, it will inevitably lead to an increase in coal blending costs. In addition, the addition of minerals also increases the ash content of coke. For coal whose ash components are mainly silicon and aluminum oxides, the addition of iron and calcium oxides will require additional costs, and only high-reactivity coal with high calcium oxide and iron oxide content as raw materials can prepare high-efficiency coal. Activated coke has a higher cost performance

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