How to deal with calcium chloride waste from ammonia-alkali process equipment?
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Calcium chloride waste will be produced in the ammonia-alkali method for making alkali. It is difficult to control this waste. Please tell me.: How did you handle it?
It is dried on the beach, then evaporated and concentrated to produce solid calcium chloride.
If we adopt the method of "beach drying, then evaporation and concentration", then the space required is probably very large, right? Is there any other way?
The purpose of beach drying is also to increase the concentration and at the same time refine and remove some impurities. If it evaporates directly, the cost will be higher. Japan seems to use membrane separation technology to concentrate calcium chloride and sodium chloride and simultaneously separate calcium chloride and sodium chloride, but China has never been able to do it.
The cost is too high. It’s not that it hasn’t been done.
Do you have information on membrane separation of calcium chloride and sodium chloride? Send it to me? As for running costs, Japan doesn’t seem to be particularly high. But there is no specific data, I just heard that
Membrane separation technology has been applied in some domestic industries. Does anyone have information on membrane separation of calcium chloride and sodium chloride? I suggest you send it to us to learn from it.* Just for a moment!
Simple production process: 1. The waste liquid undergoes sedimentation. 2. The supernatant liquid is concentrated through three-effect evaporation. 3. Sodium chloride crystallizes out. 4. Separate the by-product sodium chloride through a centrifuge. 5. Heat the decalcification pot of the concentrated solution to continue concentrating. 6. Go to the tabletting machine to make calcium pentahydrate into flakes. 7. Enter the vibrating fluidized bed for drying to obtain calcium chloride dihydrate. 8. Finished product after packaging. 9. It can also be made into anhydrous calcium.
8# ssl2341 Most of the calcium chloride plants supporting ammonia and alkali plants in China basically use this process. Shandong Haihua uses beach drying, and Qinghai Alkali Industry also prepares beach drying. First, there is plenty of space, and second, Qinghai has a large amount of evaporation. It is said that the annual evaporation can reach 1.8m. If other calcium chloride plants want to reduce energy consumption, they can use a multi-effect evaporation process, and some have achieved six effects, but the scarring problem is difficult to solve.
The investment in calcium chloride treatment equipment seems to be high, using rising film or falling film evaporators.
The main component of ammonia-alkali process alkali residue is calcium chloride. Calcium chloride can be extracted and used for the production of snow melting agents and road maintenance, etc., and has little impact on the environment. Due to demand, it is not possible to extract all the calcium chloride. Therefore, the company adopts internationally accepted methods for the treatment of alkali residue, that is, it is harmlessly treated and safely stacked, and then produced into engineering backfill soil for padding projects. It has been used in the construction of Caofeidian Seaport.