Calcium hydroxide

Calcium hydroxide is a white powdery solid. The chemical formula is Ca(OH)?, commonly known as slaked lime and slaked lime, and the aqueous solution is called clarified lime water. Calcium hydroxide has the general properties of alkali and is a strong alkali. Calcium hydroxide is a strong binary base, but it is only slightly soluble in water. Calcium hydroxide is widely used in industry.

Introduction

Chinese name: calcium hydroxide

Chinese alias: slaked lime; slaked lime

English name: Calcium hydroxide

English alias: Slaked lime; calcium dihydroxide; calcium hydrate; dihydroxycalcium

CAS:1305-62-0

EINECS:215-137-3

Calcium hydroxide: Regulatory information: This product is not regulated

Color: white powdery solid.

Solubility: Slightly soluble in water, emits a lot of heat

Corrosion: slightly weaker than sodium hydroxide (NaOH), moderately strong alkali

Acidity: Alkaline

Product English name: Calcium hydroxide; Hydrated lime; Slaked lime; Lime, hydrated, limewater

Product aliases: slaked lime, hydrated lime (ShúShí Huī), lime water (solution), lime milk (suspension), lime slurry (suspension)

Alias: slaked lime; hydrated lime

Basic use: Used to make bleaching powder, hard water softener, improve soil acidity, tap water disinfection clarifier and construction industry.

Inhalation of lime dust may cause pneumonia. The maximum allowable concentration is 5mg/m3

。When inhaling dust, you can breathe in water vapor, codeine and Eugene, and apply mustard ointment on the chest; when it falls into the eyes, rinse with running water as soon as possible, and then use 5% ammonium chloride solution or 0.01% CaNa?- Rinse with EDTA solution, and then drop 0.5% dicaine solution. Pay attention to protecting the respiratory organs while working, wear dust-proof fiber work clothes, gloves, airtight dust-proof glasses, and apply grease-containing ointment to prevent dust inhalation.

Packaging, storage and transportation It is packed in plastic woven bags lined with polyethylene plastic film bags, each with a net weight of 25kg. Should be stored in a dry warehouse. Prevent moisture. Avoid storage and transportation with acids. Protect from rain during transportation. In case of fire, use water, sand or general fire extinguishers to put out the fire.

Physical and chemical properties Fine white powder. The relative density is 2.24. When heated to 580°C, it is dehydrated into calcium oxide, which absorbs carbon dioxide in the air to form calcium carbonate. Soluble in acid, ammonium salt, glycerin, slightly soluble in water, insoluble in alcohol, strong alkaline, corrosive to skin and fabrics.

Product Usage

Construction: Sanhe soil, lime mortar. Painting walls

Note: 1. Carbon dioxide makes the clarified lime water turbid

⒉The newly painted wall will "sweat"

⒊The bottle of lime water will be opened for a long time, it will form a layer of white film (calcium carbonate), which can be cleaned with hydrochloric acid

Agriculture: Bordeaux mixture is prepared as a pesticide, calcium sulfate is slightly soluble in water)

{Note: When preparing, it cannot be carried out in an iron container, nor can it be stirred with an iron rod

Change the pH of the soil by adding proper amount of hydrated lime to the soil to neutralize the acidity and change the pH of the soil