Molded cap ball composite heating agent and production process thereof

Abstract

The invention discloses a molded cap ball composite heating agent and a production process thereof. The molded cap ball composite heating agent is mainly characterized by being prepared by processing the following raw materials: aluminum powder, sodium nitrate, ferric oxide powder, fluorite powder and acidified graphite. The production process comprises the following steps: proportioning and stirring the raw materials; pressing the mixture in a spherical mold in a double-pan friction press of 60 tons by a high-pressure screw machine to mold at high pressure; pushing the molded ball out of themold by the press to primarily package; and accurately measuring and proportioning a standard required amount of acidified graphite to secondarily package. The invention solves the problems of reduced thermite reaction speed, non-ideal heating temperature, deep shrinkage cavity and low yield of a traditional heating agent due to expansion after compounding the acidified graphite. The ball composite heating agent has rapid reaction and higher heating temperature of over 1600 DEG C, fully achieves secondary feeding effect, forms phialiform shrinkage at the head of a casting blank and improves the yield of the casting blank by more than 5 percent.

Description

Technical field [0001] The invention relates to a metallurgical paving product for preventing the deep shrinkage of the ingot head in the field of metallurgy, and in particular to a spherical compound heating agent for a molded cap and a production process thereof. Background technique [0002] In the early 1980s, the anti-shrinkage product used for the head of the die-casting ingot in my country's metallurgical industry was a heat-preserving anti-shrinkage agent. low rate. In the 1990s, manufacturers of metallurgical auxiliary materials used metal aluminum (Al) and sodium nitrate (NaNO 3 ), iron powder (Fe 2 o 3 ), sawdust, expanded graphite (acidified graphite) and other materials to design and develop a powdery exothermic anti-cratering agent, referred to as exothermic agent. Double function, this product has significantly improved the effect of preventing the shrinkage of the ingot head compared with the anti-cratering agent product, but this kind of heating agent imm...

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Problems solved by technology

[0003] In order to solve the disadvantages of obviously weakening the reaction speed and low heating temperature after the volume expansion of the powdery heating agent, the present invention produces and develops a compound heating agent with a molded cap mouth sphere and its production process, which solves the problems existing in the powdery heating agent

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