Questions about caustic soda
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This post was last edited by sunjl1981 on 2013-1-6 at 23:45. Does anyone have any information regarding caustic soda? Please share it with me. What causes caustic soda to often overflow from the tank? This post was last edited by limingshuguang on 2007-12-5 16:27 ] # ， ， &
:'( :'( Does no one know?? I’m really in a hurry. Please, everyone out there – I’m looking for information regarding the handling or production process of caustic soda. Even if you can suggest any books that might help me, that would be great!
Caustic soda often overflows from the tank. At temperatures of 240–320 degrees, nitrates, chlorates, and hypochlorites in the liquid caustic soda decompose violently, producing a large amount of foam that leads to overflow. Additionally, insufficient cleaning of the tank, inadequate addition of nitrate, high levels of liquid in the tank, rapid temperature rise, and too much sodium carbonate in the exhaust tank can all cause overflow. Appropriate measures can be taken according to the specific circumstances. Based on practical experience, add an appropriate amount of butter when the pot overflows. :victory: Last edited by limingshuguang on 2009-2-2 12:53 in this post ]
May I ask how much investment is required to set up a 200,000 tons per year caustic soda plant using Swiss Bot technology? How much is invested in domestic production? By how much is the cost of solid caustic higher than that of liquid caustic? Thank you. Urgently needed.
1. The problem upstairs is too big! It seems that only Huang Jing can answer your question ； 2. Comparison of the costs of solid caustic and liquid caustic: What is the concentration of the caustic at the outlet? What kind of evaporation process? Fuel for molten salts? With so many uncertainties, how can we compare?
32% liquid caustic, 32%-61% steam heating. Heated at 61%-99% molten salt temperature, with gas used as fuel for the molten salt
May I ask another stupid question? Where do chlorates and hypochlorites come from? Which process is responsible for their introduction?
Reply to Floor 7: 1. To increase the concentration from 32% to 61%, steam, electrical power (for material transportation, etc.), industrial water (for circulating cooling) are required, in addition to employee salaries and equipment depreciation. We have not carried out this process at 61%; our highest achieved concentration is 50%, with a steam consumption of around 600–700 kg per ton. For 100% NaOH, together with all other costs, the total additional expense should be around 300 yuan. 2. As for the final concentration and tabletting system: (1) Fuel consumption: The specific heat capacity of molten salt is 0.35 KCAL/KG·°C; the heat required for a plant with a capacity of 10,000 tons is 1386 KCAL/h. The cost is estimated based on the calorific value of the fuel. (2) The lamination system also incurs additional costs for electricity consumption, packaging, alkali dust absorption, transportation, etc.
Of course it’s produced through electrolysis; it can’t be generated inside the BL!
Isn’t it added through color adjustment? Chlorates should decompose quite easily, right? Haven’t they decomposed yet after the evaporation process?
Chlorates have strong oxidizing properties and should not decompose during the evaporation process. They are highly corrosive to their targets, so the concentration of chlorates in the alkaline solution is a very important parameter.