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Sulphuric Acid on the WebTM Technology Manual DKL Engineering, Inc.

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Knowledge for the Sulphuric Acid Industry
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Introduction
General
Definitions
Instrumentation
Plant Safety
Metallurgial Processes
Metallurgical
Sulphur Burning
Acid Regeneration
Lead Chamber
Technology
Gas Cleaning
Contact
Strong Acid
Acid Storage
Loading/Unloading
Transportation
Sulphur Systems
Liquid SO2
Boiler Feed Water
Steam Systems
Cooling Water
Effluent Treatment
Utilities
Construction
Maintenance
Inspection
Analytical Procedures
Materials of Construction
Corrosion
Properties
Vendor Data

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Properties - Arsenic
July 5, 2003

Introduction
General
Physical Data
Stability
Toxicology
Fire Hazards
Explosion Hazards
Transport Information
Personal Protection		 Associated Links

Introduction

Arsenic is an impurity in the metallurgical off-gases that feed the acid plant gas cleaning system.  Arsenic compounds will be present in deposits in the gas cleaning equipment and in the weak acid circulating in the systems.

General

Most arsenic compounds are toxic so care must be taken when working in or around the equipment and when handling weak acid, deposits and sludge.  Arsenic compounds may cause irritation to the eyes, skin, mucous membrane and respiratory tract.

Under reducing conditions arsenic compounds may convert to the highly toxic arsine gas (AsH3).

Physical Data

Appearance Arsenic Oxide (As2O3)  Solid: white crystals or powder
Dissolves in weak acid solutions
Arsenic Sludge  Coarse-grain and pasty material.  Often reddish colour due to iron oxide being present.  Dusty when dry
Odour  Unpleasant onion odour

Stability

To follow

Toxicology

To follow

Fire Hazards

Arsenic sludge is not flammable

Explosion Hazards

Explosion hazards may be present due to the formation of hydrogen when the sludge comes in contact with zinc, aluminum and other light metals.

Transport Information

To follow

Personal Protection

The following protective equipment is recommended:

  • Tightly sealed protective goggles

  • Respirators with colloidal filter (fine-grain)

  • Protective plastic or rubber gloves

  • Protective clothing such as boots, pants coat

Careful personal hygiene is important in preventing exposure to arsenic.  Hands should be wash carefully and thoroughly with soap and water prior to eating or drinking.

 

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