Maybe you don't know what kind of manufacturing process you use for low ferric sodium sulfide or crystal sodium sulfide. In fact, it has different methods of production and use in different industries. Below I will tell you the relevant information to help you use it better.
Production and use precautions
The pulverized coal reduction method is characterized in that the Glauber's salt and the coal powder are mixed and calcined at a high temperature of 800 to 1100 ° C according to a ratio of 100: (21 to 22.5) (weight ratio), and the resultant is cooled and then dissolved into a liquid with a dilute alkali solution, and the mixture is cooled. After clarification, the upper concentrated lye is concentrated to obtain solid sodium sulfide. Tablet (or granular) sodium sulfide product obtained by transfer tank, tableting (or granulation)
Chemical reaction equation：Na2SO4+2C→Na2S+2CO2
The absorption method uses 380-420 g/L sodium hydroxide solution to absorb H2S>85% hydrogen sulfide waste gas, and the obtained product is concentrated by evaporation to obtain a finished sodium sulfide product.
Chemical reaction equation：H2S+2NaOH→Na2S+2H2O
The sulphide sulphide method can produce sodium sulfide by-product when the sodium sulphate and the sulphide sulphide are metathesized to produce precipitated barium sulfate.
Chemical reaction equation：BaS+Na2SO4→Na2S+BaSO4↓
In the gas reduction method, in the presence of an iron catalyst, hydrogen (or carbon monoxide, producer gas, methane gas) is reacted with sodium sulfate in a boiling furnace to obtain high-quality anhydrous granular sodium sulfide (containing Na2S 95% to 97). %).
Chemical reaction equation:
The production method and the refining method take the sodium sulfide solution with a concentration of about 4% by-product in the process of producing precipitated barium sulfate as a raw material, and then pump it into a double-effect evaporator to dilute to 23%, and then enter the stirring tank to remove iron and remove After the carbon treatment, the pump is used to drive the evaporator (made of pure nickel material) to evaporate the alkali solution to reach the concentration, and after being sent to the drum water in the cooling type tableting machine, the finished product is obtained through screening and packaging.
Production and use precautions
Route of entry: Inhalation of ingestion.
Respiratory protection: Generally no special protection is required, and if necessary, wear a respirator.
Skin contact: Rinse immediately with water for at least 15 minutes. Get medical attention if you have a burn.
Eye contact: Immediately lift eyelids, rinse with running water or saline for at least 15 minutes, or rinse with 3% boric acid solution.
Inhalation: Remove from the site to fresh air. Perform artificial respiration if necessary.
Ingestion: Ingestion of milk or egg white. Seek medical attention immediately.
Fire fighting methods: misty water, sand.
Other: After work, shower and change clothes. Pay attention to personal hygiene.
Leakage emergency treatment: Isolation of the contaminated area and warning signs around it. Emergency personnel wear gas masks and chemical protective clothing. Do not touch the spill directly. Avoid dust and collect it in a clean, covered container with a clean shovel and transport it to a waste disposal site. It can also be rinsed with a large amount of water, and the diluted lotion is placed in the wastewater system. Such as a large number of leaks, collected or recycled or discarded after harmless treatment.
Wastewater treatment method: The wastewater causing sulfide pollution is mainly alkaline wastewater, which can be neutralized. During the neutralization phase, some of the hydrogen sulfide escapes from the atmosphere as the pH decreases, and the heat generated by the neutralization reaction also increases the rate of hydrogen sulfide release. Hydrogen sulfide is released in large quantities in the air, which pollutes the air and disturbs the people. Chlorination can also eliminate sulfide pollution, which is also one of the effective methods, but requires a large amount of chlorine and high cost. In addition, iron or non-toxic iron salts (such as iron sulfate, ferric chloride, etc.) are added to the sulfide-contaminated wastewater. After 2 hours of aeration, active iron hydroxide is produced, and the sulfide can be precipitated as iron sulfide. The form is removed. Waste water with serious sulfide pollution can also be neutralized by flue gas and then treated with activated sludge.
The above introduction should give you an idea of the production principle of sodium sulfide. For more detailed information, you can go to the website to learn or contact us, we will answer your questions.