Fast binder for producing cold bonded pellet from ferruginous material

Abstract

The invention relates to a binder, in particular to a fast binder for producing cold bonded pellet from ferruginous material. The binder consists of a sodium silicate, carbon powder, polyacrylonitrile fibre, sodium sulfate decahydrate. The invention is featured with simple technique, low usage cost, high degree of pelletizing, short production period and suitability for continuous production; the invention can use ferruginous material to pelletize and can improve the pelletizing quality and increase micro hole in pellet ore; it can improve the reducibility of cold bonded pellet in smelting process; the invention has high intensity of cold bonded pellet, and low pulverization, which has no need of smelting and can replace lump ore for direct use of steel-making and iron-making.

Description

technical field [0001] The invention relates to a binder, in particular to a fast binder for producing cold-set pellets from iron-containing materials. Background technique [0002] At present, bentonite is mostly used as a binder in the production of pellets in my country's metallurgical industry. However, during the process of forming pellets, the return rate of the binder is 25-30%, which remains high. When drying, its drying speed is slow. , affecting output and increasing energy consumption. And the main component of bentonite is SiO 2 and A1 2 o 3 According to general experience, with the addition of 1% bentonite, the Fe-containing grade of the pellets will decrease by 0.6%, and the slag output will increase by 8-15%. my country's pellet mills add 4% of bentonite on average, the most of which reaches 7-8%, and the least of which is no less than 2.5%, so that the iron-containing grade of the pellets will decrease, affecting the energy consumption and output of smelti...

AI Technical Summary

Problems solved by technology

my country's pellet mills add 4% of bentonite on average, the most of which reaches 7-8%, and the least of which is no less than 2.5%, so that the iron-containing grade of the pellets will decrease, affecting the energy consumption and output of smelting, and affecting the blast furnace. Smelting causes huge economic losses

[0003] The invention patent applied by our company on November 20, 2007 "A binder suitable for producing cold-set pellets with iron-containing materials" (patent application number: 200710036164.X, publication number: CN101161832), the patent The binder formula recorded is composed of alkaline foaming alkali, cold-soluble polyvinyl alcohol, polyacrylonitrile fiber, and light calcium carbonate in a certain proportion. It is proved by the production and experimental data in the past few years that the patented In the ball forming process, the above-mentioned binder still has the disadvantages of too large addition amount, low ball forming rate, long curing time, and high production cost.