Iron oxide dust and fume

ACGIH TLV TWA 5 mg(Fe)/m3 (vapor, dust) Not Classifiable as a Human Carcinogen Rouge 10 mg/m Not Classifiable as a Human Carcinogen DFG MAK 1.5 mg/m3 calculated as fine dust NIOSH REL (Iron Oxide, Dust and Fume) TWA 5 mg/m3... 

The ACGIH threshold limit value, 8 h time-weighted average, for iron oxide dust and fume is 5mgm. The Environmental Protection Agency s Federal Drinking Water Guideline for iron is 300 pgH. ... 

Iron oxide—Siderosis, fibrosis caused by iron oxide particles, is a form of pneumoconiosis. The ACGIH TLV-TWA for iron oxide dust and fume is 5 mg/m (ACGH 1998). 

Welders are typically exposed to a complex mixture of dust and fume of metallic oxides, as well as irritant gases, and are subject to mixed-dust pneumoconiosis with possible loss of pulmonary function this should not be confused with benign pneumoconiosis caused by iron oxide. Although an increased incidence of lung cancer has been observed among hematite miners exposed to iron oxide, presumably owing to concomitant radon gas exposure, there is no evidence that iron oxide alone is carcinogenic to man or animals. ... 

Iron(lll) oxide [Hematite] dust and fume, as Fe FtgOg 1309-37-1 5 mg/m ... 

There are several major types of chronic lung disorders that can be caused by exposure to toxicants. A common symptom of chronic lung damage is chronic bronchitis. Among the toxicants that cause this condition are ammonia, arsenic, cotton dust (brown lung disease), and iron oxide from exposure to welding fumes. 

Hazard Dust and fine particles suspended in air are flammable and an explosion risk. TLV (as oxide fume) 5 mg/m3 for soluble salts (as iron) 1 mg/m3. Biochemistry Iron is a constituent of hemoglobin and is essential to plant and animal life, an important factor in cellular oxidation mechanism. 

Iron oxide fume (CAS 1309-37-1) Fumes and dusts can produce a benign pneumoconiosis (siderosis) with shadows on chest radiographs. 5 mg/m (as Fe) 2500 mg/m (as Fe) Red-brown fume with a metallic taste. Vapor pressure is negligible at 20°C (68°F). 

Waelz process. In this process, after the calcine is leached, the zinc ferrite residue is filtered, washed, dried, and heated with coke in a rotary hearth furnace. The zinc is reduced and fumed off as metallic vapor, reoxidized, and collected as a pure zinc oxide in the bag-house dust and normally leached in a separate step. Part of the lead and silver is recovered, and the iron remains in the slag. 

The dust layer may be removed extremely efficiently from the cloth surface by means of pulsating air blasts, the direction of these changing each time. In this way a filter may be freed from the most strongly adhering dust [404], namely, volatile ash with a mean particle diameter of 0.6 m, fumes of silicon oxide (day = 0.3/i), and iron oxide (day < 0.1 M) for a dust concentration of over 2 g/m in the gas. 

IRON-SILICON ALLOY (8049-17-0) Combustible solid. Dust or powder forms explosive mixture in air. Reacts with water, producing toxic fumes and explosive hydrogen and acetylene gases. Strong oxidizers can cause ignition and explosions, especially with finely divided material. Reaction with acid, acid fumes, or oxidizers can cause the emission of toxic fumes. Incompatible with sodium hydroxide. 

Inhalation of iron(II) oxide fumes or dust is considered a hazard and can cause throat and nasal irritation. High levels of exposure may lead to a condition known as metal fume fever, a workplace exposure illness that causes flu-like symptoms. Continued exposure at high levels can have more serious effects, including a disease known as siderosis, an inflammation of the lungs that is accompanied by pneumonia-like symptoms. 

EXPLOSION and FIRE CONCERNS flammable in the form of dust when exposed to heat or flame when heated or on contact with acid or acid fumes, it emits highly toxic fumes dangerous when water solutions of arsenicals are in contact with active metals such as iron, zinc, aluminum flammable by chemical reaction with bromates, chlorates, iodates, peroxides, lithium, silver nitrate, nitric acid, potassium permanganate, chromium trioxide, chlorine trifluoride, chlorine oxide, bromine trifluoride, bromine pentafluoride, bromine azide use foam, carbon dioxide, or dry chemical for firefighting purposes.. 

Metal sulphides. Many metals (e.g., iron, copper, lead, nickel) are found as mineral ores in sulphide form (pyrites) of which iron sulphide is most common. These are concentrated by physical and chemical means to produce an ore ready for economical extraction. Some may be subject to oxidation to generate heat, deplete oxygen, and emit toxic fumes. Calcined pyrites are used in the production of sulphuric acid and sulphur dioxide. In the presence of moisture, the calcined residue or dust can generate acids. 

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