Definition

Noun: 1. A substance that initiates or accelerates a chemical reaction: In chemistry, an activating agent is a material that increases the rate of a reaction or makes a reaction possible. 2. A surface-active chemical used to increase attraction to a specific mineral: In mineral processing (specifically flotation), an activating agent is a chemical that modifies the surface of a desired mineral particle, making it more receptive to attachment by collector chemicals and air bubbles, thereby enabling its separation from unwanted material.

Usage Examples

• General Chemistry:
  • The catalyst served as an activating agent, significantly speeding up the polymerization process.
  • An acid is often used as an activating agent in this type of esterification reaction.
• Mineral Processing:
  • Copper sulfate is a common activating agent used in the flotation of sphalerite (zinc ore).
  • The activating agent was added to the slurry to selectively prepare the surface of the target mineral for collection.

Advanced Usage

• Selective Activation: A key function in mineral flotation is the selective use of an activating agent to affect only one type of mineral in a mixed ore, allowing for precise separation.
• Contrast with Depressants and Collectors: In flotation chemistry, activating agents are distinct from other reagents. Depressants inhibit certain minerals, while collectors coat the mineral surface to make it hydrophobic. The activating agent prepares the mineral surface the collector can adhere effectively.

Variants and Related Words

• Activator (noun): A general synonym for an activating agent, commonly used in both chemistry and biochemistry (e.g., an enzyme activator).
• Activate (verb): To make active or reactive.
• Activation (noun): The process of making something active.

Synonyms

• Promoter
• Initiator (in specific contexts)
• Catalyst (in a broad sense, though catalysts are typically not consumed)

Antonyms / Contrasting Terms

• Inhibitor: A substance that slows down or prevents a chemical reaction.
• Depressant (in mineral processing): A reagent used to prevent a specific mineral from floating.
• Poison (in catalysis): A substance that deactivates a catalyst.

Noun

1. (mineral extraction) a surface-active chemical used in flotation process to increase the attraction to a specific mineral