Silicon Slag

Silicon slag is a by-product generated during the smelting of metallic silicon or ferrosilicon alloys, typically tapped from the bottom of the furnace. It contains a certain amount of elemental silicon (usually 30%-70%) along with other components like silica, calcium, and aluminum.

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Product Introduction

Product Overview

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Production Process

Silicon slag primarily originates from the submerged arc furnace smelting process. Silica (SiO₂) and carbonaceous reducing agents (e.g., petroleum coke, coal) react at high temperatures to produce metallic silicon or ferrosilicon. The lighter metallic silicon is the main product, while the denser slag (silicon slag), containing unreacted silicon and other oxides, settles at the furnace bottom. It is then tapped, cooled, and crushed into the final product.

Key Features

Cost-Effective: More competitive in price compared to pure metallic silicon or ferrosilicon, significantly reducing production costs.

Effective Silicon Source: Contains available elemental silicon, effectively serving for deoxidation and alloying.

Applications

Steelmaking Deoxidizer: Used as a deoxidizer in steelmaking to remove oxygen from molten steel, improving steel quality.

Foundry Additive: Used in the foundry industry to adjust the silicon content in molten iron or steel, enhancing casting properties.

Raw Material for Ferrosilicon: Can be used as a raw material for producing lower-grade ferrosilicon, enabling resource recycling.

FAQ

Q: What's the main difference between silicon slag and silicon metal /ferro silicon?

A: The key differences are silicon content and form. Metallic silicon/ferrosilicon are primary products with high and consistent silicon content. Silicon slag is a by-product with lower and more variable silicon content, but it offers significant price advantages, often used in less stringent applications.

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