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Application scenarios of industrial potassium alum
Release time：
2021-05-26
1. Water Treatment Field
Mechanism of Action:
(Al^{3+}) hydrolysis generates Al(OH) 3 ) colloids, which adsorb suspended matter and impurities in water. It is commonly used in the coagulation and sedimentation of drinking water and industrial wastewater.
Application Parameters:
Dosage: 50-200mg/L (adjust according to water turbidity), optimal pH range 6.5-8.0. Flocculation is best at water temperatures of 20-30℃.
2. Papermaking Industry
Uses:
Used as a sizing agent (rosin size + alum) to improve the water resistance of paper; as a precipitating agent to fix fillers (such as kaolin), reducing paper dusting.
Process Impact:
Best results are achieved under acidic conditions (pH 4.5-5.5), but this accelerates paper aging (gradually being replaced by neutral sizing agents in modern times).
3. Textile Dyeing and Printing
Mordant Action:
(Al^{3+}) forms coordination compounds with dye molecules, improving the binding force between the dye and fibers (such as cotton and silk), especially suitable for natural dyes (such as alizarin).
4. Fermentation and Food Processing (Industrial Grade Use Restricted)
Note: Industrial grade alum, due to high impurity levels, is not directly used in food, but can be used in:
Baking powder buffer (reacts with baking soda to produce gas);
Starch products (such as vermicelli) as a strengthener (heavy metal content must be strictly controlled).
5. Other Applications
Component of fire extinguishing agents (mixed with baking soda solution to produce CO₂);
Pigment filler in paint manufacturing;
Astringent in leather tanning;
In agriculture, as an insecticide (controlling aphids, etc.) and soil improver (adjusting acidity).
Storage and Safe Operation
1. Storage Requirements
Store in a sealed container in a dry and ventilated place, preventing deliquescence (easily caking when air humidity >75%), storage temperature ≤30℃, avoid mixing with alkaline substances (such as NaOH).
2. Safety Precautions
Health Hazards: Dust irritates the respiratory tract, contact with skin causes dryness; ingestion can cause gastric mucosal damage (LD₅₀ oral administration in rats is approximately 3000mg/kg).
Operational Suggestions: Wear a dust mask and gloves, rinse eyes thoroughly with plenty of water if contact occurs, and use water or sand to extinguish fires.
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