Origin
In our country, calcium appeared in the form of metal, which dates back to one of the key projects aided by the Soviet Union to our country before 1958, a military industrial enterprise in Baotou. Including the liquid cathode method (electrolysis) metal calcium production line. In 1961, a small-scale trial produced qualified metal calcium.
Development:
Dated to the late 1980s to the early 1990s, with the country's strategic adjustment of military industrial enterprises and the proposal of the "military-to-civilian" policy, metal calcium began to enter the civilian market. In 2003, as the market's demand for metal calcium continued to increase, Baotou City has become the country's largest metal calcium production base, Where own four electrolytic calcium production lines, with an annual production capacity of 5,000 tons of metal calcium and products.
The emergence of Calcium Aluminum Alloy:
Due to the high melting point of metallic calcium (851°C), the calcium burning loss in the process of adding metallic calcium into molten lead liquid is as high as about 10%, which leads to higher costs, difficult composition control, and long time-consuming energy consumption. Therefore, it is necessary to form an alloy with metal aluminum and metal calcium to slowly melt layer by layer. The appearance of calcium aluminum alloy is precisely aimed at solving this defect in the preparation process of lead calcium aluminum alloy.
|
Melting point of calcium-aluminium alloy |
|
|
Content of Ca% |
Melting Point |
|
60 |
860 |
|
61 |
835 |
|
62 |
815 |
|
63 |
795 |
|
64 |
775 |
|
65 |
750 |
|
66 |
720 |
|
67 |
705 |
|
68 |
695 |
|
69 |
680 |
|
70 |
655 |
|
71 |
635 |
|
72 |
590 |
|
73 |
565 |
|
74 |
550 |
|
75 |
545 |
|
76 |
585 |
|
77 |
600 |
|
78 |
615 |
|
79 |
625 |
|
80 |
630 |
The production of calcium aluminum alloy is a process of melting and fusing in a vacuum state using high temperature according to a certain ratio of metal calcium and metal aluminum.
The Classification of Calcium Aluminum Alloy:
Calcium aluminum alloy is generally classified 70-75% calcium, 25-30% aluminum; 80-85% calcium, 15-20% aluminum; and 70-75% calcium 25-30%. It can also be customized As per the requirement. Calcium aluminum alloy has metallic luster, lively nature, and the fine powder is easy to burn in the air. It is mainly used as a master alloy, refining and reducing agent in metal smelting. The products are supplied in the form of natural blocks, and can also be processed into products of different particle sizes according to user needs.
The Quality Classification of Calcium Aluminum Alloy
As a master alloy, the quality requirements for calcium aluminum alloy are extremely strict. (1) The content of metallic calcium fluctuates in a small range; (2) The alloy must not have segregation; (3) Harmful impurities must be controlled within a reasonable range; (4) There must be no oxidation on the surface of the alloy; At the same time, the production, packaging, transportation and storage of calcium aluminum alloy are required The process must be strictly regulated. And the manufacturers of calcium-aluminum alloys we supply must have formal qualifications.
Transportation and storage
The chemical properties of calcium aluminum alloy are very active. It is easy to oxidize and burns easily when exposed to fire, water and severe impact.
1. Packaging
After the calcium aluminum alloy is crushed according to a certain specification, it is put into a plastic bag, weighed, filled with argon gas, heat-sealed, and then put into an iron drum (international standard drum). The iron barrel has good waterproof, air-isolated and anti-impact functions.
2. Loading and unloading
During loading and unloading, forklift or crane (electric hoist) should be used for loading and unloading. Iron drums should never be rolled or thrown down to prevent damage to the packaging bag and loss of protection. More serious conditions may cause the burning of calcium aluminum alloy in the drum.
3. Transport
During transportation, focus on fire prevention, waterproofing and impact prevention.
4. Storage
The shelf life of calcium aluminum alloy is 3 months without opening the barrel. Calcium aluminum alloy should not be stored in the open, and should be stored in a dry, rain-proof warehouse. After opening the packaging bag, it should be used up as much as possible. If the alloy can not be used up at a time, the air in the packaging bag should be exhausted. Tie the mouth tightly with a rope, and put it back into the iron drum. Seal to prevent alloy oxidation.
5. It is strictly forbidden to crush calcium-aluminum alloy in iron drums or packaging bags containing calcium-aluminum alloy to avoid fire. The crushing of calcium aluminum alloy should be carried out on the aluminum plate.
6. Once the calcium aluminum alloy burns, never use water to extinguish the fire. The unburned calcium aluminum alloy should be quickly isolated, and then dry sand or dry soil should be used to cover the burning alloy.
