Where can I get good Calcium oxide

Where can I get good Calcium oxide? For many people this is a strange object, and here's the introduction to it:

Calcium oxide, an inorganic compound, is known as CaO and the common name lime. The physical properties are white powder on the surface, and the impurities are pale, yellow or gray, with moisture absorption.

role

1: the filling agent used as epoxy adhesive;

2, used as analytical reagent, absorbent when used as the carbon dioxide gas analysis, spectral analysis reagents, high purity reagents used in the semiconductor epitaxy in production, diffusion process, laboratory dry ammonia and alcohol dehydration, etc.

3. Used as raw materials for making calcium carbide, pure alkali, bleaching powder, etc., also for making leather, waste water purification, calcium hydroxide and various calcium compounds;

4. Can be used as building materials, metallurgical flux, cement accelerator and phosphor powder;

5. Used as vegetable oil decolorizer, drug carrier, soil conditioner and calcium fertilizer;