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Calcium Carbide

Updated: 2026-08-05

Overview

Calcium carbide briquette is a compressed form of calcium carbide (CaC2), a chemical compound primarily used in industrial applications. It is produced by heating lime and coke in an electric arc furnace, resulting in a solid material that reacts vigorously with water to produce acetylene gas. The briquette form is preferred for its ease of handling, storage, and transportation compared to powdered calcium carbide. It is widely utilized in industries such as metal fabrication, chemical manufacturing, and welding due to its ability to generate acetylene gas on demand.

Physical and Chemical Properties

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Calcium carbide briquettes are typically gray or black in appearance and have a high density, making them stable for storage and transport. The material is highly reactive with water, producing acetylene gas (C2H2) and calcium hydroxide (Ca(OH)2) in an exothermic reaction. The reaction is highly efficient, with 1 kg of calcium carbide generating approximately 350 liters of acetylene gas under standard conditions. This property makes it invaluable for applications requiring a portable and reliable source of acetylene, such as welding and cutting operations.

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Main Applications

The primary use of calcium carbide briquettes is in the generation of acetylene gas, which is essential for welding, cutting, and flame hardening processes. Acetylene is favored for its high flame temperature and versatility in metalworking. In the steel industry, calcium carbide is used for desulfurization, where it helps remove sulfur impurities from molten iron or steel. Additionally, it serves as a reducing agent in chemical synthesis and is sometimes used in carbide lamps for mining and spelunking.

Safety and Storage

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Calcium carbide briquettes must be stored in a dry, airtight environment to prevent accidental contact with moisture, which can lead to the release of flammable acetylene gas. Proper ventilation is essential in storage areas to avoid gas accumulation. Handling requires protective equipment, including gloves and goggles, to prevent skin and eye irritation. In case of exposure to water, immediate evacuation and ventilation are necessary to mitigate explosion risks. Fire extinguishers suitable for chemical fires should be readily available.

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B2B Procurement Guide

When procuring calcium carbide briquettes, buyers should prioritize suppliers who offer moisture-proof packaging and clear handling instructions. The purity of the briquettes (typically 70-85% CaC2) should align with the intended application. Prices vary depending on regional availability, purity, and packaging standards. Bulk purchases often yield cost savings, but storage capacity and safety measures must be considered. Certifications such as ISO or industry-specific standards can indicate reliable suppliers.

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