Process for the preparation of silicon-based bismuth-containing inoculant blocks

By using a casting process that involves adding bismuth particles or needles outside the furnace, the problem of burn-off caused by the low melting point of bismuth was solved. This improved the bismuth yield and the uniformity of the inoculum composition, optimized the graphite morphology and mechanical properties of the castings, and met the requirements of automated casting production lines.

CN122382278APending Publication Date: 2026-07-14NANJING PUJIANG ALLOY MATERIALS CO LTD
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Patent Information

Application Number
CN202610736438.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-26
Publication Date
2026-07-14

AI Technical Summary

Technical Problem

In the existing technology, when adding bismuth to silicon-based inoculum, the low melting point of bismuth leads to severe melting and burning losses in the furnace, resulting in low bismuth yield, unstable composition of the inoculum, high production costs, and difficulty in guaranteeing the inoculation effect.

Method used

By adding bismuth particles or needles outside the furnace and combining them with the casting process, silicon-based alloys are melted in a medium-frequency induction furnace and bismuth is added into the mold during the pouring process. This avoids burn-off under high temperature conditions and ensures uniform distribution of bismuth.

Benefits of technology

It significantly improves bismuth yield, ensures stable composition of inoculum, optimizes graphite morphology, enhances the mechanical and machinability properties of castings, adapts to the needs of automated casting production lines, and reduces production costs.

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Abstract

The application belongs to the technical field of cast iron casting materials, and provides a preparation process of a silicon-based Bi-containing inoculant block, which comprises the following steps: putting ferrosilicon, rare earth ferrosilicon alloy, silicon-barium alloy, silicon-calcium alloy and scrap steel into a medium-frequency induction furnace to perform melting and heat preservation, so as to form a silicon-based alloy melt; preheating a casting mold and placing the preheated casting mold in a pouring station to pour the silicon-based alloy melt; when the weight of the poured silicon-based alloy melt reaches a preset proportion of the target inoculant block weight, bismuth is added along with the flow; the pouring of the silicon-based alloy melt is continued until the target inoculant block weight is reached; the inoculant block is naturally cooled to room temperature, and after the inoculant block is completely solidified, the inoculant block is demolded, the surface oxide scale and impurities are cleaned, and a silicon-based Bi-containing inoculant block is obtained. According to the application, the adding mode and process parameters of bismuth are optimized, the burning loss of bismuth under a high-temperature environment is effectively reduced, the yield of bismuth is improved, the composition of the inoculant block is uniform, the performance of the inoculant block is stable, the inoculation effect is optimized, and the production demand of in-mold inoculation of an automatic casting production line is met.
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