Ventilation

47問 • 1年前

ユーザ名非公開

通報

問題一覧

Active workings in coal mines should be ventilated by a current of air with _____ and not more than 0.5% CO2

not less that 19.5% O2

Effect: Faster, Deep breathing

17 % Oxygen in Air

Effect: Dizzinness, Buzzing in ears, Rapid heartbeat

15% Oxygen in Air

Effect: Possible loss of consciousness with prolonged exposure

13% Oxygen in Air

Effect: Fainting, Unconsciuosness

9% Oxygen in Air

Effect: Life Endangerment

7% Oxygen in Air

Effect: Convulsive Movements, Death

6% Oxygen in Air

Normal mine air has 0.03% CO2

Carbon Dioxide

In mining, a mixture of carbon dioxide and air is referred to in mining as "blackdamp"

Carbon Dioxide

A coloreless, Odorless, Noncumbustible gas that may have an acid taste when lresent in high concentrations

Carbon Dioxide

It is heavier than air and is therefore usually found in low places near the floor

Carbon Dioxide

Effect of CO2 in Air: Deep Breathing

0.5% CO2 in Air

Effects of CO2 in air: Lung ventilation doubles

3% CO2 in Air

Effects of CO2 in Air: Lung Ventilation increases to 300 %

5% CO2 in Air

Effects of CO2 in Air: Can be tolerated only for few minutes

10% CO2 in Air

Effects of CO2 in Air: Death occurs Ralidly

18% CO2 in Air

is colorless, odorless, tasteless, nontoxic, highly flammable and lighter than air. It usually accumulates along the rooflines

Methane

A mixture of methane and air is referred to in mining as

Firedamp

While carbon dioxide is a significant constituent of seam gas in brown coal (lignite), the main constituent of higher rank coal seam gas is ______. The volume of these byproduct gases increases with the rank of coal and is the highest for anthracite

Methane

A colorless, odorless, tasteless, toxic, and flammable gas produced by the incomplete combustion of carbonaceous material

Carbon Monoxide

Poisonous even at very low concentration and explosive over a wide range (1.5 - 74%)

Carbon Monoxide

Acts as a type of aphyxiant by displacing the oxygen normally carried by the hemoglobin of the blood. The affinity of the blood for carbon monoxide is approximately 3000 times that for oxygen

Carbon Monoxide

Oxyhemoglobin= Oxygen + Hemoglobin ; Carboxhemoglobin (COHb)= Carbon monoxide + hemoglobin

Carbon Monixide

Toxic effect of CO is measured in terms of the percentage of COHb or blood saturation level

Carbon Monoxide

A mixture of carbon monoxide and air is refered as

Whitedamp

Stinkdamp because of its odor (rotten egg)

Hydrogen Sulfide

A colorless, toxic, and explosive gas formed by the decomposition of sulfur compounds

Hydrogen Sulfide

Quite soluble and may be carried into active mine workings by groundwater

Hydrogen Sulfide

Threshold of odor of Hydrogen sulfide

0.025 ppm

A colorless, nonflammable, toxic gas formed whenever sulfur or sulfur compounds are burned

Sulfur Dioxide

Sources: Blasting of certain sulfur ores, during fires involving sulfu compounds such as iron pyrite, and from IC engines

Sulfur Dioxide

Significally heavier than air, and in very low concentrations is irritating to the eyes nose and throat

Sulfur dioxide

Formed during blasting and from the operation of IC engines

Oxide of Nitrogen

Is rapidly oxidized to nitrogen dioxide in presence of moisture and air and is therefore seldom found in significant amounts underground

Nitric Oxide

Is not only more common of the two but also more toxic

Nitrogen Dioxide

Reacts with moisture to form nitrous and nitric acid

Oxides of Nitrogen

Death ro exposure may be very quick if the exposure level is high or may occur several day laters as a result of pulmonary edema ( water in the lung) or even weeks later as a result of infectious pneumonia

Oxides of Nitrogen

Curent TLV-TWA of Oxides of Nitrogen

3 ppm

the source of ___ Underground are the charging of batteries, the action of water or steam on hot materials, and action of acid on metals

Hydrogen

Extremely explosive, approximately 4-74% in air

Hydrogen

Only requires 5% 02 to ignite

Hydrogen

Chemically inert and radioactive gas

Radon

Sources: present in uranium mines and some coal mines

Radon

1 Detection methods of Methane:

Optical ( IR and interferometer)

Any mass of solid or liquid particles suspended in a gas

Aerosols

Are solid products that result from physicochemical processess of combustion,sublimination, or distillation

Fumes

is a type of automation system which is used for handling air quality and thermal comfort given to human envronment for survival

HVAC system

Mineral Processing

Mineral Processing

Chemical Composition

Chemical Composition

Mineral Physical Properties

ユーザ名非公開 · 52問 · 1年前

Mineral Physical Properties

Petrology

Petrology

Coal

Coal

Structural Geology

Structural Geology

Economic Geoglogy

Economic Geoglogy

Surveying

Surveying

Ecology

Ecology

Prospecting And Exploration

ユーザ名非公開 · 83問 · 1年前

Prospecting And Exploration

83問 • 1年前

ユーザ名非公開

Mine safety and Health

ユーザ名非公開 · 48問 · 1年前

Mine safety and Health

Bomasang Magazine

Bomasang Magazine

Rare earth

Rare earth

Mining Methods

Mining Methods

Mining 3

Mining 3

問題一覧

Active workings in coal mines should be ventilated by a current of air with _____ and not more than 0.5% CO2

not less that 19.5% O2

Effect: Faster, Deep breathing

17 % Oxygen in Air

Effect: Dizzinness, Buzzing in ears, Rapid heartbeat

15% Oxygen in Air

Effect: Possible loss of consciousness with prolonged exposure

13% Oxygen in Air

Effect: Fainting, Unconsciuosness

9% Oxygen in Air

Effect: Life Endangerment

7% Oxygen in Air

Effect: Convulsive Movements, Death

6% Oxygen in Air

Normal mine air has 0.03% CO2

Carbon Dioxide

In mining, a mixture of carbon dioxide and air is referred to in mining as "blackdamp"

Carbon Dioxide

A coloreless, Odorless, Noncumbustible gas that may have an acid taste when lresent in high concentrations

Carbon Dioxide

It is heavier than air and is therefore usually found in low places near the floor

Carbon Dioxide

Effect of CO2 in Air: Deep Breathing

0.5% CO2 in Air

Effects of CO2 in air: Lung ventilation doubles

3% CO2 in Air

Effects of CO2 in Air: Lung Ventilation increases to 300 %

5% CO2 in Air

Effects of CO2 in Air: Can be tolerated only for few minutes

10% CO2 in Air

Effects of CO2 in Air: Death occurs Ralidly

18% CO2 in Air

is colorless, odorless, tasteless, nontoxic, highly flammable and lighter than air. It usually accumulates along the rooflines

Methane

A mixture of methane and air is referred to in mining as

Firedamp

Methane

A colorless, odorless, tasteless, toxic, and flammable gas produced by the incomplete combustion of carbonaceous material

Carbon Monoxide

Poisonous even at very low concentration and explosive over a wide range (1.5 - 74%)

Carbon Monoxide

Acts as a type of aphyxiant by displacing the oxygen normally carried by the hemoglobin of the blood. The affinity of the blood for carbon monoxide is approximately 3000 times that for oxygen

Carbon Monoxide

Oxyhemoglobin= Oxygen + Hemoglobin ; Carboxhemoglobin (COHb)= Carbon monoxide + hemoglobin

Carbon Monixide

Toxic effect of CO is measured in terms of the percentage of COHb or blood saturation level

Carbon Monoxide

A mixture of carbon monoxide and air is refered as

Whitedamp

Stinkdamp because of its odor (rotten egg)

Hydrogen Sulfide

A colorless, toxic, and explosive gas formed by the decomposition of sulfur compounds

Hydrogen Sulfide

Quite soluble and may be carried into active mine workings by groundwater

Hydrogen Sulfide

Threshold of odor of Hydrogen sulfide

0.025 ppm

A colorless, nonflammable, toxic gas formed whenever sulfur or sulfur compounds are burned

Sulfur Dioxide

Sources: Blasting of certain sulfur ores, during fires involving sulfu compounds such as iron pyrite, and from IC engines

Sulfur Dioxide

Significally heavier than air, and in very low concentrations is irritating to the eyes nose and throat

Sulfur dioxide

Formed during blasting and from the operation of IC engines

Oxide of Nitrogen

Is rapidly oxidized to nitrogen dioxide in presence of moisture and air and is therefore seldom found in significant amounts underground

Nitric Oxide

Is not only more common of the two but also more toxic

Nitrogen Dioxide

Reacts with moisture to form nitrous and nitric acid

Oxides of Nitrogen

Curent TLV-TWA of Oxides of Nitrogen

3 ppm

the source of ___ Underground are the charging of batteries, the action of water or steam on hot materials, and action of acid on metals

Hydrogen

Extremely explosive, approximately 4-74% in air

Hydrogen

Only requires 5% 02 to ignite

Hydrogen

Chemically inert and radioactive gas

Radon

Sources: present in uranium mines and some coal mines

Radon

1 Detection methods of Methane:

Optical ( IR and interferometer)

Any mass of solid or liquid particles suspended in a gas

Aerosols

Are solid products that result from physicochemical processess of combustion,sublimination, or distillation

Fumes

is a type of automation system which is used for handling air quality and thermal comfort given to human envronment for survival

HVAC system