Method for rapidly and directly reducing haematite or limonite into ferrous powder

Abstract

The invention relates to a method in which hematite or limonite are quickly reduced and made into iron powder, which aims to use iron ore difficult to be magnetically separated as a raw material to reduce the cost. The method is characterized in that hematite ore or limonite ore are crushed and then washed and magnetically separated; iron ore powder, coal powder and lime powder are mixed according to the proportion, and calcium fluoride and adhesive are added to be pressed into flans with pores, and the flans are dried; the structure of a kiln car surface is improved, and a sagger is made; the pressed and dried flans are hoisted to the kiln car surface after being put orderly, and the sagger is covered outside the flans; a tunnel kiln is used for calcinating the flans, and two ends of the tunnel kiln are covered with air sealing machines; after the kiln car travels out of the tunnel kiln, a motor hoist is used to hoist the sagger, calcinating blocks are pushed into a water pool to be quickly cooled and automatically ground, and the iron powder and dregs are fished out to directly enter a ball mill to be wetly milled and be pressed into blocks or bagged after the separation of a magnetic separator and the drying.

Description

technical field [0001] The invention relates to a production method of sponge iron, in particular to a method for rapidly and directly reducing hematite or limonite to make iron powder. Background technique [0002] In recent years, with the rapid development of my country's iron and steel industry, my country's high-grade iron ore concentrate powder is in serious shortage and needs to be imported in large quantities from abroad. But at the same time, there are a large amount of ores that cannot be magnetically separated, such as hematite and limonite, in mines all over the country. Because of the lack of direct reduction into iron powder, a large amount of hematite and other iron ores cannot be effectively utilized. . Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art, and provide a method for making iron powder by rapid and direct reduction of hematite or limonite that uses iron ore th...

AI Technical Summary

Problems solved by technology

But at the same time, there are a large amount of ores that cannot be magnetically separated, such as hematite and limonite, in mines all over the country. Because of the lack of direct reduction into iron powder, a large amount of hematite and other iron ores cannot be effectively utilized.

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