Scaling due to the concentration of waste dilute sulfuric acid to produce industrial acid
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Our company uses multi-effect evaporation to produce industrial acids from waste dilute sulfuric acid; due to the presence of metal ions in the material, scaling occurs severely during the concentration process. Do any of the seniors know manufacturers of chemicals for preventing scale formation with sulfuric acid? Please recommend something
So how can this problem be solved? Please give some guidance.
A reasonable operating system is required, with proper design
Could you explain why scale inhibitors cannot be used? The equipment has now been installed, and since the design was inappropriate, nothing can be changed.
There is no scale inhibitor that can be used in this medium
This post was last edited by Falcon2014 on 2019-3-17 08:03. This is a complicated issue; metal ions need to be removed before concentration, and scale inhibitors as well as polymerization inhibitors lose their effectiveness at high temperatures. The concentration unit should not be modified.
It is indeed very troublesome; I wanted to remove metal ions before concentration as well, but using exchange resins didn’t work.
Can an anti-scaling device be installed on the pipeline?
This post was last edited by pzhmotor on 2019-5-6 at 17:05. We have a similar process (I just came here after searching for the relevant keywords; it involves the concentration and reuse of waste acid from titanium dioxide production, which is considered a challenge in this industry), and we’ve encountered the same problems as well – they are really tricky. The operation cycle is short, which severely impacts production capacity; graphite blocks are prone to perforation, and the costs are high ； Regular manual mechanical cleaning is labor-intensive... Scale inhibitors are added to sulfuric acid; it’s not clear whether they are effective or not, but our manufacturing process does not allow their use, as they would contaminate titanium dioxide due to the need for reusing the solution. Adding a filter for desalination at the upstream stage (membrane filters have been tested, but the investment and operating costs are high); the cost is too great. Let’s now consider the main directions: making cleaning easier and online scale prevention. If the latter is feasible, it can address this issue at its source. Some professional manufacturers have expressed interest, but they have not yet come to our site for in-person discussions.