Abstract Diamond is a kind of mineral composed of pure carbon. It is also the hardest material in nature. Natural diamond is a valuable diamond. In the industry, diamond is also widely used. Synthetic diamond uses instantaneous static or dynamic ultra-high pressure high-temperature technology to make carbonaceous materials such as graphite from...
Diamond is a kind of mineral composed of pure carbon. It is also the hardest substance in nature. Natural diamond is a valuable diamond. In the industry, diamond is also widely used. Synthetic diamond uses instantaneous static or dynamic ultra-high pressure and high-temperature technology to directly convert carbonaceous materials such as graphite from solid or molten state into diamond. The conditions of high temperature and high pressure are harsh and generally unachievable by non-professional equipment.
However, a man in Shanghai attempted to manufacture diamonds privately without qualification and technology, which eventually led to an explosion accident, causing a welder to be killed on the spot. A few days ago, the Minhang District People’s Procuratorate approved the arrest of the suspect, Jia, for the crime of negligent death.
At 2 o'clock on the afternoon of January 13 this year, the proprietress of a trading company in Minhang District of Shanghai was checking the accounts. Suddenly there was a loud noise. The doors and windows in the store were shaking violently. The boss rushed out of the store and found that she was working in the store. The cousin Xiaopeng was covered in blood and lying on the ground. There was a black wound in his chest that was bleeding. A steel pipe and an electric welding machine were dropped not far from the body. After 120, he was confirmed to have died on the spot. Then the policeman died. The suspect of the crime scene, Jia, was brought back to interrogation.
Jia is 33 years old this year. On the day of the incident, Jia Mou carried a cylindrical metal container containing magnesium powder, water and sugar, and came to the trading company to agree with the boss to weld the container for 40 yuan. Jia had come to the store several times before welding similar containers, and the proprietress directly arranged Xiaopeng to help him weld. There is an iron cover at the top of the container. Jia told Xiaopeng that it is only necessary to solder the lid to the container and seal it. So Xiaopeng picks up the welding machine and starts welding the container. It took just ten minutes to happen. An explosion accident.
The iron cylindrical container that caused the explosion was made by Jia. It was about 25 cm high and 112 mm in diameter. The inner volume was about 400 ml. It contained sucrose, water and magnesium powder. It was used by Jia to synthesize artificial diamond. raw material. According to Jia's confession, it was intended to weld the container after sealing, and then use a U-tube to heat the reaction for several hours. If successful, a small amount of transparent diamond crystals will be obtained.
Jia was interested in chemistry during high school. When he was on the Internet, he saw that diamond can be used not only as a tool for drills, but also for diamond jewelry and eye-catching synthetic diamonds. Someone began to query relevant information online, and combined with the basic theory of chemistry that was learned before, began to study how to make diamonds for profit.
Jiamou saw that the special container for making diamonds on the Internet is a high-pressure reaction kettle. The container can withstand higher pressure and can be automatically pressurized and heated without causing leakage. The disadvantage is that it is expensive. In order to reduce the cost, Jia Mou privately used the seamless steel pipe and iron sheet to seal the sides to serve as a heating reaction vessel according to the principle of the reactor.
In terms of raw materials, Jia knows that the chemical composition of diamond is mainly carbon, and sucrose only leaves carbon as long as the water is removed. Therefore, Jia tried to heat the sucrose, but diamond crystals could not be produced anyway. Later, after studying the chemical vapor deposition method on the Internet, Jia Mou discovered that it lacked the role of hydrogen. After many experiments, he finally found out the ratio of self-made artificial diamonds such as water, magnesium powder and sucrose, and succeeded in producing a small amount. Diamond crystals.
Jia knows for himself how to seal the steel pipe is the most difficult problem, and the link may be dangerous if it is slightly careless. Due to the lack of welding machine and the qualification and technology of electric welding, Jia found a trading company closer to home, and agreed with the proprietress to process and weld the container at a price of about 30-40 yuan each time until the incident occurred. Jia has been to the shop for welding many times, but did not expect to eventually have such a serious consequence.
According to experts, when welding and cutting operations, especially when cutting gas, due to the use of compressed air or oxygen flow, Mars, beads and iron slag splash around, when there are flammable, explosive materials or gases in the working environment. At this time, fires and explosions may occur.
In the interrogation of the public security organs and the procuratorate, Jia confessed that the magnesium powder in the self-made container will produce high concentration of hydrogen by reducing hydrogen atoms in the water, which is extremely flammable and explosive under the sealed heating environment. The danger is very well known, but because there are no problems with many attempts, I have the luck and confidence to ignore the basic security risks, which eventually led to the tragedy.
At the same time, according to the store owner's memory, he had asked Jia about whether the container was in danger of explosion. Jia promised that even if it burned red, it would not explode. Then Jia did not inform Xiaopeng of the welding any danger. Sex.
According to the surveillance video of the crime scene, Jia was not at the welding site when the explosion occurred. He stood in the distance of seven or eight meters across the road from the store gate to play with the mobile phone, so it was not affected by the explosion.

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