High Purity Calcium Metal

High Purity Calcium Metal

Part One:How to making Calcium Metal:

Six Steps of Making Calcium

1. Calcining marble (CaCO3), commonly known as calcined white,into quick lime (CaO);

2. Quickly mix quicklime (CaO) with aluminum powder (AL) and use the ball press machine to make flat balls with a length of about 4 cm;

3. Put the flat ball in the reduction tank with a high temperature of 1200 degrees, and then evacuate the reduction tank;

4. The aluminum powder and quicklime underwent displacement reaction under vacuum and high temperature conditions to produce alumina and metal calcium steam;

5. The metallic calcium vapor condenses in the water-cooled section of the reduction tank to form metallic calcium crystals;

6. After cooling, the metal calcium crystals can be processed into metal calcium products of the required specifications, such as metal calcium particles and metal calcium powder.

Part Two: How to get the High purity Calcium Metal

Generally there are three method to get the high purity calcium metal. Reduction method, electrolytic method and calcium refining

The reduction method is the main method for producing metallic calcium. Generally, limestone is used as a raw material, calcined into calcium oxide, and aluminum powder is used as a reducing agent. The calcined crushed calcium oxide and aluminum powder (reducing agent) are mixed evenly in a certain proportion, pressed into a block, and reacted under 0.01 vacuum and 1050-1200 ℃ temperature to generate calcium vapor and calcium aluminate (alumina), The reduced calcium vapor crystallizes at 750-400 ° C.The crystallized calcium is melted under the protection of argon to obtain a dense calcium ingot. The recovery rate of calcium produced by reduction method is generally about 60%.

The earlier calcium electrolysis method is a contact method. In this method, the raw material consumption is large , the solubility of metallic calcium in the electrolyte is high, the current efficiency is low, and the product quality is poor (about 1% of chlorine), etc.  To improve these shortcomings,later contact method is improved to the liquid cathode method electrolysis.

Calcium refining: High-purity calcium can be obtained after industrial calcium is further processed by high vacuum distillation. Generally, the distillation temperature is controlled at 780-820 ° C, and the vacuum degree is 1 × 10-4.Distillation treatment is less effective in purifying chloride in calcium. Nitrogen compounds can be added below the distillation temperature to form double salts. By adding nitrides and purifying by vacuum distillation, the sum of impurity elements chlorine, manganese, copper, iron, silicon, aluminum, nickel, etc. in calcium can be reduced to 1000-100ppm, that is, 99.9% -99.99% high purity calcium metal.

Part Three: Main Data of High purity calcium metal:

Type One: Ca Min 99.0%

Type Two: Ca Min99.5%

Type Three: Ca Min 99.85%

Type Four: Ca Min 99.95%

Part Four: Form& Package:

Turning: 80kg/ New Drums,6.4MT/80drums/20’FCL; 12.8MT/160drums/40’FCL

Lumps:125kg/New Drums;10MT//80drums/20’FCL; 20MT/160drums/40’FCL

Granules:175kg/New Drums;14MT//80drums/20’FCL; 28MT/160drums/40’FCL

(Attention:The drums inner with two layers of plastic film ,All of the drums pased the UN test,Has charge of Argon)