Recycling of waste residue from soda ash production
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Dear colleagues: A large amount of waste residue is produced during the production of soda ash. So far, the main disposal method for these waste residues is natural accumulation. Cause environmental pollution. I wonder who has good methods or research on reusing these waste residues? You can share it.
5.1.1 Ammonia-alkali process enterprises implement a concentrate policy to reduce waste residue emissions. The ammonia evaporated waste liquid is separated into solid and liquid. The clear liquid can be used to make calcium chloride and re-produced salt. The solid residue can be used to fill the land and build roads, make engineering soil, bricks, cement, soil conditioners, etc., or be sent to designated locations for storage. 5.1.2 Joint-alkali method enterprises implement a fine material policy and use washing salt or vacuum salt. Set up a special storage tank to recover the tower wash water and reuse it. Set up a plate and frame filter press (or similar equipment) to separate solid-liquid AII mud, return the filtrate to the system, and use the filter cake as calcium and magnesium fertilizer or send it to a designated location for safe disposal.
5.1.1 Ammonia-alkali process enterprises implement a concentrate policy to reduce waste residue emissions. The ammonia evaporated waste liquid is separated into solid and liquid. The clear liquid can be used to make calcium chloride and re-produced salt. The solid residue can be used to fill the land and build roads, make engineering soil, bricks, cement, soil conditioners, etc., or be sent to designated locations for storage. To solve the problem of stockpiling, it is unrealistic to use only soil amendments. There has been no progress in cement either. Brick making is not as good as waste from thermal power plants, and no one uses it. The engineering soil is purely to transfer pollution. If there is no soil buried here, there will be a place to bury it. Therefore, a thorough solution is sought and converted into usable production raw materials.
Ammonia evaporation waste liquid is subjected to solid-liquid separation. It can also be used to remove sulfate radicals.
This post was last edited by lxq700918 on 2009-10-14 23:01: loveliness: I don’t know if you have heard of Tianjin Shunhong Alkali Residue Real Estate Development Co., Ltd. Our company processes the waste residue produced by the ammonia-alkali method, mainly used for backfill soil. In addition, it can also react with potassium feldspar to make potassium fertilizer and cement. You can discuss it with me in detail.
As mentioned above, it is currently mainly used as engineering backfill and mixed into cement as filler. However, it is said that it will reduce the grade of cement.
Everyone upstairs also pointed out the key point of the ammonia-alkali process, which is the problem of waste residue treatment. The real transformation of waste into treasure has not yet been realized. At best, it can only be made into fertilizer and bricks.
Mine salt plants can be injected into underground wells to reduce pollution, but the subject is difficult!
This paper summarizes and classifies the current alkali residue treatment methods for ammonia-alkali soda ash production at home and abroad. The treatment methods are divided into four categories.: ①Reclamation of land and building dams for storage. This is also the most commonly used measure at present; ② Treat waste with waste, or comprehensively utilize it to turn waste into treasure; ③ In-depth development of fine chemical products; ④ Realize recycling of original processes.