Mill coal composite pulverized coal modifier, modified coal prepared by using mill coal composite pulverized coal modifier, and preparation method of modified coal

Abstract

The invention discloses a composite pulverized coal modifier, a modified coal prepared by using the composite pulverized coal modifier, and a preparation method of the modified coal. The pulverized coal modifier comprises the following components in percentage by mass: 0.1-10% of phenylacetic acid, 0.1-25% of borax, 0.1-30% of boron oxide, 30-50% of boric acid, 0.1-10% of calcium dodecyl benzene sulfonate, 0.1-15% of N-acyl glutamate, 0.1-10% of polyethylene powder, 0.1-20% of atactic polypropylene, 0.1-5% of sodium bentonite or / and calcium bentonite, and 0.1-15% of iron ore concentrates. The modified coal comprises the following components in percentage by mass: 0.01-3% of the composite pulverized coal modifier and 97-99.99% of non-coking coal. The preparation method of the modified coal comprises the following steps of: milling the composite pulverized coal modifier into a powder; crushing non-coking coal; placing the non-coking coal and the composite pulverized coal modifier in a reactor, and adequately mixing and reacting; controlling a temperature in the reactor to be 25-300 DEG C; and controlling the reaction time for more than 30 minutes. The composite pulverized coal modifier, the modified coal prepared by using the composite pulverized coal modifier, and the preparation method for the modified coal disclosed by the invention have the advantage that the mass ratio of the modified non-coking coal occupying coking blended coal is up to more than 70%, so that the resources of coking coal can be saved, and the coking cost can be greatly decreased.

Description

technical field [0001] The invention relates to the technical field of coal blending and coking, in particular to a non-coking coal composite pulverized coal modifier, modified coal prepared by using the non-coking coal composite pulverized coal modifier, and a preparation method of the modified coal. Background technique [0002] Although the world's coal resources are abundant, the coal resources for coking are very limited. Therefore, economical use and expansion of the scope of coking coal have been widely valued both at home and abroad. With the rapid development of my country's iron and steel industry and the large-scale blast furnace, the demand for coke and the quality requirements are also increasing. In 2012, the output of iron and steel in my country was 680 million tons and 720 million tons respectively, and the output of coke was 443 million tons, equivalent to about 600 million tons of raw coal for coking. Although my country has abundant coal resources and a...

AI Technical Summary

Problems solved by technology

However, in traditional coal blending and coking, the amount of directly blending non-coking coal is very limited, and there is no good solution for using the above coal types in large quantities.