Bonding agent for iron ore pellet and preparation method thereof

Abstract

A binding agent for iron ore pellet is composed of raw materials in the following percentage by weight: 20-70% sodium bentonite, 30-79% dressing ore tailings with ascharite and 1-10% addition agent. The mesh size is smaller than 200 after being grinded. The invention can totally replace alta-mud to pelletize, wherein the content of Si is far lower than alta-mud, which not only can improve the grade of pellet ore, but also significantly improves the high temperature metallurgical property. The invention fully utilizes stacked dressing ore tailings, and solves the problems of the application of tailings and environment protection.

Description

technical field [0001] The invention belongs to the field of metallurgy, in particular to a binder for iron ore pellets and a preparation method thereof. Background technique [0002] my country is a big steel producing country, and there is a great demand for pellets for ironmaking every year. Pellets have metallurgical properties such as high iron content, good reducibility, and high cold strength. Increasing the proportion of pellets used is an important means to optimize the structure of the blast furnace charge, promote energy saving and consumption reduction in the ironmaking process, increase production, and achieve environmental friendliness. For this reason, my country's iron and steel enterprises are working hard to develop pellets. [0003] However, limited by iron ore resources and equipment processing conditions, iron ore concentrate powder, the raw material for pellet production in my country, has problems such as low grade, high gangue content, coarse particl...

AI Technical Summary

Problems solved by technology

However, such additives are expensive, and in the drying process of green pellets, there are defects such as a drop in burst temperature, so there are no domestic companies using organic binders in the actual pellet production process