Materials commonly used in fireworks: 10. Properties of potassium dichromate

Fireworks commonly used materials: 10, the properties of potassium dichromate English name potassiurn dichromate; molecular formula for KeCr2O,, molecular weight 294.2

1. Physicochemical properties. Appearance and properties: orange-red plate-like crystals with a bitter metallic taste; Melting point: 398°C; Relative density (air = 1): no information; Relative density (water = 1); 2.68; Solubility: soluble in water, insoluble in ethanol.
2. Health Hazards. Acute poisoning: inhalation can cause acute respiratory irritation, nosebleed, hoarseness, nasal mucous membrane atrophy, sometimes asthma and cyanosis, and chemical pneumonitis in severe cases. Oral consumption can stimulate and corrode the digestive tract, causing nausea, vomiting, abdominal pain and bloody stools, etc.; in severe cases, respiratory distress, cyanosis, shock, liver damage and acute renal failure. Chronic effects: there are contact dermatitis, chrome ulcers, rhinitis, nasal septum perforation and respiratory tract inflammation.
3. Hazardous Characteristics. Strong oxidising agent. Can release oxygen when exposed to strong acids or high temperatures, prompting the combustion of organic materials. Mixed with reducing agent, organic matter, flammable materials (such as sulfur, phosphorus or metal powder, etc.) can form explosive mixtures. Mixed with sodium sulphide, it can cause spontaneous combustion when there is water. Contact with nitrates, chlorates, etc. to produce violent reactions. Strong corrosiveness.
4. Emergency treatment of leakage. Isolate the leakage contaminated area and restrict the exit of people. It is recommended that emergency personnel wear dust masks (full face masks) and anti-virus clothing. Do not allow the leak to come into contact with reducing agents, organics, flammables or metal powders. Small spills: Collect with a clean shovel in a dry, clean, covered container, or flush with large amounts of water, dilute with wash water and place in the wastewater system. LARGE SPILL: Collect for recycling or transport to waste disposal site for disposal.
5. Fire extinguishing methods. Use mist water, sand, etc. to extinguish fires.