15-25mm Calcium Carbide: Physical and chemical properties: ores are solid brown or black block, pure white crystals (including CaC2 higher purple). Density of 2.22 g / cubic centimeter, the melting point of 2300 ° C (with CaC2 content), water immediately intense reaction to generate acetylene, and release heat, Calcium Carbide content varies with the melting point also will change.
Impurities: Caustic soda often contain calcium arsenide (Ca3As2), calcium phosphide (Ca3P2) and other impurities, and the role of water at the same time release arsine (AsH3), phosphine (PH3) and other toxic gases, so the use of Acetylene generated by calcium carbide is toxic.
Crystal structure
The most common crystal form of CaC2 is tetragonal, stable between 298K and 720K. Quartet CaC2 similar to the crystal structure of NaCl, but due to [: C≡C:] 2- ion oval, oriented, the crystal is tetragonal. In CaC2 crystal, the C-C distance is 120pm, which corresponds to the bond length of carbon-carbon triple bond, the distance between Ca and C is 259 and 282pm.
15-25Mm Calcium Carbide,Acetylene Plant Calcium Carbide,Industrial Calcium Carbide,Steel Calcium Carbide Ningxia Tongji International Trade Co.,Ltd. , http://www.tongjiinternational.com
First, the price trend According to the business community price monitoring data show that as of August 9, 304/2B 1.0 cold-rolled stainless steel flat plate price market price was 14,628.57 yuan / ton, compared with Monday (5) rose 1.49%. The stainless steel plate market has risen continuously for more than a month, compared to the lowest point on July 10, an increase of 4.38%.
Second, the influencing factor analysis From the beginning of July, the stainless steel plate that fell for half a year continuously has finally stabilized and the market is in a good position. Then, influenced by the overall domestic steel market, the price has risen so far, and the average market price has risen. 600 yuan / ton. In addition to the pull-up of the overall steel market, the main reason for the rise in stainless steel is caused by rising nickel prices.
According to the monitoring of business clubs, the London nickel market climbed sharply on the 8th and rose by 2.1% in one day, closing at $14,306/ton. The stock of trading market was 294,081 tons, an increase of 120 tons from the previous day. The rise of Lon nickel directly boosted the price of Jinchuan electrolytic nickel (slab) ex-works by 1,500 yuan/ton on the 9th, Shanghai's quotation was 10.05 yuan/ton on the 9th, and on the 5th, the Jinchuan electrolytic nickel (slab) ex-factory price was only 985 thousand yuan / ton, a cumulative increase of 2,000 yuan / ton.
In response, rising nickel prices have increased the confidence of steel traders in the market. However, due to the relatively low inventory of cold-rolled stainless steel plates, the arrival of steel mills is not very fast, which has led to a sharp rise in the prices of some merchants. As for the increase in the price of resources, the performance is relatively low-key, and the gains in the afternoon market remain.
At present, the base price of cold rolling resources in Wuxi market is reported to 15,400 yuan/ton, and the price of Zhangpu and Baoxin base is reported to 15500-15900 yuan/ton.
Third, the market outlook predicts business club steel analyst He Hangsheng believes that with the gradual arrival of the supply of steel mills, steel traders this week, the pace of upward adjustment will gradually unify, stainless steel continues to maintain upward trend.