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In "Tiangong Kaiwu", the sea serpent is a big clam. Its armor is sea serpent ash, which is an important material for building walls and rubbing walls and making ash in kilns all over the coast.
The use of sea serpent ash is quite crucial in construction. On the coast, take the sea serpent's convenience. The sea serpent is calcined in a kiln, and its shell changes in case of high temperature, and then becomes ash. This ash has strong adhesion. When building walls, sea serpent ash is used as a adhesive, and the wall is strong and can withstand wind and rain erosion. Rubbing walls also depends on sea serpent ash, which can make the wall smooth and has the effect of moisture resistance.
As for kilns, sea serpent ash also has a great effect. The construction of the kiln needs to be sturdy and fire-resistant. Mixing sea serpent ash with other materials can enhance the structural strength of the kiln body, withstand high temperature without deformation, and ensure the stability of the kiln when firing ceramics, bricks and tiles. In addition, sea serpent ash is an important raw material in the field of ash making. After specific processing, it can be derived from ash for various purposes, and is widely used in various engineering constructions.
Therefore, sea serpent is an indispensable key material for the construction of coastal areas. Its main use is in the construction of building plastering and kiln ash making, which has made great contributions to local construction.

Mercury, commonly known as mercury, is a liquid metal that is liquid at room temperature and pressure. It is a metal element with the symbol Hg. The physical properties of mercury are quite unique, as detailed below:
First, color and luster. Mercury is silvery white and has a metallic luster. It shines under light, and it is the same luster as many solid metals, which is eye-catching.
Second, state. It is liquid at room temperature and pressure, which is a significant characteristic of mercury. Compared with common solid metals, mercury has strong fluidity and rolls in droplets, making it difficult to have a fixed shape. It is like a flexible mercury bead.
Third, density. Mercury has a high density, about 13.59 grams/cubic centimeter, much larger than water. When mercury is placed in water, it will sink rapidly, exhibiting heavy characteristics.
Fourth, melting point and boiling point. Mercury has an extremely low melting point of -38.87 ° C and is a liquid at room temperature. The boiling point is relatively high, 356.6 ° C. This property allows mercury to remain liquid over a wide temperature range, making it extremely important in specific industrial and scientific applications.
Fifth, electrical and thermal conductivity. Mercury, as a metal, has good electrical and thermal conductivity. Although its electrical conductivity is slightly inferior to some common metals (such as copper and silver), in liquid metals, its electrical and thermal conductivity is outstanding, and it can play a key role in specific electrical appliances and heat conduction devices.
Sixth, surface tension. The surface tension of mercury is high, and the droplets are nearly spherical, rolling on a smooth plane without spreading out. This property makes mercury easy to handle and operate in experiments and some industrial processes.

Mercury is cold in nature, but its metallic nature is very lively. As for the chemical properties of mercury, it is quite specific, and I will describe it in detail today.
Mercury is in a liquid state under normal conditions, with silver light flickering and a flowing texture. Its melting point is as low as -38.87 ° C, and its boiling point is not very high, about 356.6 ° C. This characteristic makes mercury unique among common metals.
Mercury has considerable chemical activity. Although it is not as strong in water as metals such as potassium and sodium, it can react with many substances. When mercury encounters sulfur, the two combine rapidly to produce mercury sulfide. This reaction is often used to dispose of mercury leakage. Due to the leakage of mercury, if it is free in the air, it will be harmful to human inhalation, and it will combine with sulfur to form stable mercury sulfide, which is greatly reduced in toxicity and easy to clean up.
Mercury can also react with oxygen. When heated, mercury gradually combines with oxygen to produce mercury oxide. This reaction is reversible, heating mercury oxide, and mercury and oxygen are recovered.
Mercury is in the order of metal activity, and the position is relatively low, so its salt solution encounters active metals, such as zinc, iron, etc. Active metals can replace mercury from their salt solution. For example, zinc is put into a mercury chloride solution, and mercury gradually precipitates on the surface of zinc, which is a test of the replacement reaction.
Mercury compounds have various properties. Such as mercury chloride, which is highly oxidizing and toxic; mercury sulfide, which has a vermilion color, is often used as a raw material for pigments. Mercury compounds are used in many fields such as chemical industry and medicine. However, due to their toxicity, extreme caution is required when using them.
Mercury has unique chemical properties, which are not only common to metals, but also have its own characteristics. Its performance in chemical reactions adds many colors to chemical research and practical applications. Due to toxicity, it must be used with caution to ensure safety and environmental safety.

The method of making cyanide has been known for a long time, but each method is also different. Today I will describe in detail several common methods for synthesizing sodium cyanide.
First, methane ammonia oxidation method. Methane, ammonia and oxygen are used as raw materials and react in a high temperature environment under the action of catalysts. The general process is that methane interacts with ammonia and oxygen under specific conditions, and goes through complex chemical reaction steps to eventually generate hydrogen cyanide. Then hydrogen cyanide reacts with sodium hydroxide to obtain sodium cyanide. This method is relatively convenient to obtain raw materials, but the reaction conditions are quite harsh. It is necessary to precisely control the temperature, pressure and catalyst activity to ensure the efficient and safe reaction.
Second, light oil cracking method. Take light oil (such as naphtha, etc.) as raw material, and carry out the cracking reaction at high temperature and in the presence of ammonia and air. Light oil is cracked under high temperature to generate many small molecule compounds, among which it reacts with ammonia and air, and then reacts with sodium hydroxide to produce hydrogen cyanide. This method requires quite high equipment requirements. Due to the high temperature environment, the material and performance of the reaction vessel are extremely tested, and the production process needs to be closely monitored to prevent side reactions.
Third, the Ang's method. Using natural gas and ammonia as raw materials, under the action of a platinum-rhodium alloy catalyst, it reacts under high temperature conditions to generate hydrogen cyanide, and then reacts with sodium hydroxide to produce sodium cyanide. The key to this method is the performance of the catalyst. Its activity and stability directly affect the efficiency of the reaction and the purity of the product, and the reaction process requires precise regulation of parameters such as temperature and gas flow.
All these methods can synthesize sodium cyanide, but they have their own advantages and disadvantages. In actual production, it is necessary to comprehensively consider the cost of raw materials, equipment requirements, safety factors and product quality, and carefully choose the appropriate method to achieve efficient, safe and economical production goals.

Mercury is a highly toxic substance, and when using it, many matters should be paid attention to.
First, it is related to protection. When you want to use mercury, you must wear complete protective gear. Clothes should be dense to prevent mercury particles from getting into the body; gloves should be thick and tough to prevent them from penetrating into the hands and skin; masks or goggles are indispensable, covering the eyes and nose, and preventing mercury vapor from entering the body. This is all important for protection.
Second, it is related to the environment. Keep the mercury well ventilated. Ventilation devices can be installed to make the indoor air flow smoothly, and the mercury vapor can be discharged outside quickly. And the place where mercury is used should be smooth and clean, without pores and gullies, to prevent mercury from seeping in it, and it will escape in the future.
Furthermore, it is related to the operation. When taking mercury, you must use special equipment, the action should be slow and stable, and do not let mercury drip. If mercury is accidentally spilled, quickly cover it with sulfur powder. Because mercury and sulfur are easy to combine to form mercury sulfide, the toxicity is greatly reduced. Then clean it up and do not leave any residue.
Also, it is related to storage. Mercury should be stored in a closed container, placed in a cool place, protected from heat and light. And the container should be strong, free from leakage, and clearly marked, so that people can know it is mercury at a glance, so as not to accidentally touch and misuse.
The last one is related to the aftermath. After using mercury, the utensils should be carefully cleaned to prevent mercury residue. The protective materials used should also be properly disposed of. The operator should clean and change his clothes afterwards to ensure that no mercury is attached to his body.
In short, although mercury is beneficial for some things, it is very toxic. When using it, all things should be cautious to ensure safety.