Discussion on slag removal from the filter in the sulfur melting section for sulfuric acid production
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In the sulfur melting section for sulfuric acid production, after filtering liquid sulfur, a large amount of residue remains in the filter and needs to be removed. Before removing this residue, it is generally necessary to release pressure first before opening the filter for cleaning. The problem is that if the pressure is released for too long, it makes it difficult to remove the residue, as it becomes very hard; we carry out this cleaning manually, as the filter does not have any vibration mechanism. If the pressure release time is too short, a large amount of pure liquid sulfur in the slag will be wasted. Currently, we usually wait about 8 hours before removing the slag; it is estimated that 1–2 tons of liquid sulfur are wasted in this way, and it’s difficult to recover this pure liquid sulfur Do any of you have any good suggestions? This post was last edited by limingshuguang on 2009-2-7 15:08.]
Remove the filter, add a sedimentation tank and a refined sulfur tank to reduce operational steps and labor.
I wonder what model of filter you are using? 1. Before removing the slag, this process is called discharge; the duration depends on the size of your filter, usually ranging from half an hour to one hour. The material is discharged to the aid-filtering tank through the lowest point of the filter. 2. The heating steam used during discharge must not be stopped; it should only be turned off when the personnel responsible for removing and installing the filter head as well as those tasked with cleaning arrive at the site. There needs to be enough personnel – generally four cleaners – and if they work quickly, it will be less likely for the material to harden. 3. The cleaning cycle for the filter is generally 3,000 to 4,000 tons of sulfur per time; if the sulfur quality is good, this interval can be extended further. 4. The pre-coating of the filter must be thorough; this not only improves the filtering quality but also facilitates the cleaning of the filter.
Our company uses liquid sulfur filters; when removing slag, a small amount of black liquid sulfur is released, resulting in waste. Vibration does not help in this process, and removal must be done manually, which means the operating conditions are poor.
First of all, it is necessary to consider the quality of sulfur; if its acidity is high, it is essential to neutralize it using lime or alkaline substances, otherwise the filters in the filtration machine are likely to get corroded. However, too much lime or alkaline substances should not be used, as this can also lead to alkaline corrosion! We can address the issue of slag removal based on various special circumstances; if the quality of sulfur is good, slag removal can be carried out every 15–22 days, while if the quality is poor, it depends on the pressure of the filter
May I ask the original poster: the fluid filter you are using is likely of the plate-type type, right? Have you considered trying a pre-coated filter element of the cartridge-type? Automatic cake unloading and slag discharge will solve your problem. There are corresponding applications abroad.