Low-temperature pulverization inhibitor for sintered ore

Abstract

The invention relates to a smelting assistant for steel works, namely a low-temperature pulverization inhibitor for sintered ore. The low-temperature pulverization inhibitor is prepared by mixing carboxymethyl starch, boric acid, silicon micropowder and a permeate agent in designated proportion; compared with CaCl, Cl ion drag-in quantity is reduced more than 50%, the low-temperature pulverization inhibitor can not generate a replacement reaction with K and Na alkali metals in a furnace charge, therefore, the problem of continuous and circulating enrichment of KCl (kirchhoff's circuit laws) and NaCl in a blast furnace is solved, the reactivity of coke is restrained, the melting loss reaction is reduced, the heat intensity of the coke is ensured, low temperature reduction pulverization rate of the sintered ore is reduced, the destructive effect of the alkali metal on the coke and the blast furnace is basically solved, the furnace condition is smooth, and the output is increased.

Description

technical field [0001] The invention relates to a smelting auxiliary agent for iron and steel plants, that is, a low-temperature pulverization inhibitor for sintered ore. Background technique [0002] In the prior art, it is well known that blast furnaces require high-grade, low-silicon charge for the charge, so many domestic iron and steel plants have made great efforts to improve the grade of sintered ore and reduce harmful impurities, but low Silicon sintering inevitably leads to an increase in the pulverization rate of low-temperature reduction, which has a negative impact on the blast furnace. [0003] Low-temperature reduction pulverization means that the sintered ore regenerates Fe 2 o 3 upon reduction to Fe 3 o 4 In the process of sintering, the structure of the crystal changes greatly, resulting in great internal stress and volume expansion, which weakens the structure of the sintered ore, causes pulverization, and produces more powder. Due to the large amount ...

AI Technical Summary

Problems solved by technology

In severe cases, it will affect the air permeability of the upper material column of the blast furnace, reduce the gas utilization rate, and destroy the furnace condition.