Method for manufacturing sinter

Abstract

The invention relates to the technical field of mineral sintering, and in particular relates to a method for manufacturing sinter. The method comprises the following steps: crushing a raw ore, and screening by utilizing a first screen, wherein the screen underflow is a first raw ore, and the screen overflow is a second raw ore; preparing a sintering material; conveying the sintering material to a primary rotary drum mixer, and adding a water wetted sintering material; uniformly mixing the sintering material, conveying the mixture to a second rotary drum mixer, and granulating; uniformly spreading the granulated sintering material to a trolley of a sintering machine; igniting the sintering machine to burn the sintering material, and controlling the negative pressure of sintering to be 9,000-18,000Pa; and cooling the sintered sintering material, and screening the cooled sintering material by adopting a second screen, wherein the screen underflow is a sinter return ore, and the screen overflow is finished product sinter. According to the method for manufacturing the sinter, the raw ore can be appropriately applied, the sinter components are stable, and the ore preparation cost is reduced.

Description

technical field [0001] The invention relates to the technical field of mineral sintering, in particular to a method for making sintered ore. Background technique [0002] Reducing the pre-iron cost is the key to the survival of iron and steel enterprises. The largest part of the pre-iron cost is raw materials, and the cost of raw materials determines the level of the pre-iron cost. Sintered ore accounts for 60% of the charge structure, while the cost of iron material accounts for more than 80% of the sintering cost. The current method of making sinter is to use imported iron ore powder. With the deterioration of resources and the rise in the price of imported ore powder, the cost pressure of enterprises is increasing. At present, there are also iron and steel enterprises that directly use the raw ore to make sintered ore in the sintering process. If the raw ore is used directly in the sintering process, the TFe grade of the raw ore is low (generally <50%), and the ratio ...

AI Technical Summary

Problems solved by technology

At present, there are also iron and steel enterprises that directly use the raw ore to make sintered ore in the sintering process. If the raw ore is used directly in the sintering process, the TFe grade of the raw ore is low (generally <50%), and the ratio is too high to affect the sintered ore grade. In addition, due to the high harmful elements in the raw ore, such as K, Na, ZnO and S, etc., it will have a certain negative impact on the sintered grate bar, the load of harmful elements in the blast furnace, and equipment, so that the ratio of the raw ore cannot be too high, generally not More than 5%, otherwise it will easily lead to fluctuations in sintering production

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