Method for producing nodular cast iron through granular nodulizing agent

Abstract

The invention provides a method for producing nodular cast iron through a granular nodulizing agent. The method sequentially comprises the following steps that firstly, the granular nodulizing agent is produced; secondly, iron liquid is injected; thirdly, a nodulizing agent is added; and fourthly, slagging-off and pouring are conducted. The granular nodulizing agent is used for producing the nodular cast iron, high-pressure inert gas is utilized for blowing the granular nodulizing agent into a reaction chamber at the bottom of a reaction bag, the interior of the reaction chamber is completelyisolated from outside air, and magnesium oxidation and burnout are reduced; meanwhile, through the inert gas, the pressure of the reaction environment in the reaction chamber is increased, the boilingpoint of the magnesium is increased, magnesium burnout is further reduced, and the magnesium absorption rate is greatly increased and can reach 76%-85%. Rare earth magnesium-silicon-iron nodulizing agent powder in the granular nodulizing agent and iron liquid are subjected to the nodulizing reaction, the reaction efficiency is high, the time is short, the reaction is not acute, little magnesium light and smoke are generated, and a good work environment is provided for workers.

Description

technical field [0001] The invention relates to the technical field of mixers, in particular to a method for producing nodular cast iron using a granular nodularizer. Background technique [0002] Ductile cast iron is a high-strength cast iron material obtained by spheroidizing graphite in cast iron. It has high strength, good plasticity and toughness, and its comprehensive performance is close to that of steel. It is based on its excellent It has been successfully used to cast some parts with complex stress, high strength, toughness and wear resistance. Ductile iron has rapidly developed into a cast iron material that is second only to gray cast iron and is widely used. [0003] At present, the production method of nodular cast iron mostly adopts the flushing method, using an alloy nodulizer with a low magnesium content. The production method is low in technical content and easy to operate, but the absorption rate of magnesium is low, and the pollution of magnesium light ...

AI Technical Summary

Problems solved by technology

[0003] At present, the production method of nodular cast iron mostly adopts the flushing method, using an alloy nodulizer with a low magnesium content. Then pour molten iron into it for spheroidization reaction. This kind of production method has low technical content and simple operation, but the absorption rate of magnesium is low, and magnesium light and smoke pollution are serious, which will cause adverse effects on the health of production workers.

[0004] Aiming at the problems of low magnesium absorption rate, serious magnesium light and smoke pollution in the production process of ductile iron in the prior art, the present invention proposes a new solution