Method for reinforcing preparation and reduction of carbon-containing pellets in iron ore

Abstract

The invention relates to a method for reinforcing preparation and reduction of carbon-containing pellets in iron ore. The method for reinforcing preparation and reduction of the carbon-containing pellets in the iron ore comprises the following steps that (1) the iron ore, a reducing agent, a bonding agent and an additive are prepared according to a certain proportion; (2) prepared mixtures are sent into a ball mill to be crushed, fine ground, evenly mixed and the like, so that fine-sized evenly-mixed materials are obtained; (3) pelletizing or briquetting is conducted by means of the fine-sized evenly-mixed materials, so that the carbon-containing pellets in the iron ore are obtained; and (4) the prepared carbon-containing pellets in the iron ore are subjected to reducing roasting treatment, and thus metallized pellet products can be obtained. According to the method for reinforcing preparation and reduction of the carbon-containing pellets in the iron ore, in the way that the raw materials including the iron ore, the reducing agent, the bonding agent, the additive and the like enter the mill simultaneously after being prepared, the dual effects of fine grinding and sufficient and even mixing of the raw materials are achieved at the same time in the single ore grinding procedure, and the procedure links of fine grinding raw materials separately in advance, then preparing the raw materials in proportion and finally conducting even mixing of traditional operation are greatly simplified; and the quality of the carbon-containing pellets in the iron ore is remarkably improved, and the subsequent reduction process is reinforced.

Description

technical field [0001] The invention relates to the field of metallurgical technology and comprehensive utilization of mineral resources, in particular to a method for strengthening the preparation and reduction of carbon pellets in iron ore. Background technique [0002] With the development of the iron and steel industry, the problem of insufficient supply of high-quality iron ore in my country has become increasingly serious. Mineral resources have become the "bottleneck" of the development of China's iron and steel industry. The demand for iron ore in China has increased sharply. Since 2009, China has imported iron ore The average annual growth rate is 21.8%, and the continuous increase in import volume also makes China's iron ore import dependence continue to increase. In 2012, China's iron ore import dependence was about 63%. In 2014, the foreign import dependence rose again to 78.5%. At the same time, the huge pressure on coke resources seriously restricts the developm...

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Problems solved by technology

[0004] In view of the existing coal-based direct reduction efficiency is low, it is difficult to go smoothly, and the preparation process of high-quality internal carbon pellets is complicated and difficult, and a method for strengthening the preparation and reduction of iron ore internal carbon pellets is developed. , which can significantly improve the quality of internal carbon pellets, strengthen its subsequent reduction effect, and enter the rotary kiln for efficient reduction. It has significant advantages such as short treatment process, low investment cost, low energy consumption, and good product quality.

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