I'm willing to give it a shot. If you're willing to ship your system to Canada free of charge I will test it in various conditions.
Thank you for your participation in the discussion of the design of neutralizer-scrubber to capture vapors and gases at refining.
During the discussing design of Neutralizer, opinion of GRF was unanimous: for safety reasons, the exhaust after the motor must be removed from the work area.
It was felt that the proposed Device replaces a fume hood in professional workshops. It is not right. Nothing can be better and safer to work in a fume hood. In my opinion, the device is an additional tool for refiners-professionals. For example, what if fume hoods are busy, but it is necessary to process a small batch of scrap, or perform procedures not associated with neutralization NOx but requiring exhaust vent (see below)?
I made a modification (see pic.) and have already experienced hydrodynamics of neutralizer in air-water system at extreme loads. In my opinion, depending on options, represented design is suitable for both amateurs and professionals. By degree of process safety there may be various options of the design (e.g. 2-3).
The modified device consists of two identical interchangeable sections (conditionally basic and supplementary), connected by a transparent plastic reinforced flexible hose. At peak load, when the reaction can get out of control at a unskilled service or violation of technology, brown gas will be visible in the connecting hose. Then the second additional section begins to absorb gases and to «support» the first one.
Moreover, alkalinity falls in both apparatuses at different speeds. Let's say you did not do a simple test with indicator paper and did not check alkalinity in both sections of the neutralizer.
Later on at process it was found that concentration of alkali in the first section is low, it does not work well and is visible brown gas in the connective flexible hose. In this case, neutralization of vapors and gases will occur in the second, additional section of the neutralizer.
For economical use of lye, the primary and secondary unit can be interchanged. In addition, the alkaline solution can be exchanged for new in one apparatus only.
Neutralizer has two motor sections (see pic). One of them is provided with a 5 or 10-m the flexible hose. During operation, it can be removed outdoor. To overcome resistance of 10 meters of corrugated flexible hose, it was necessary to install a more powerful motor (7a instead 2a). Due to the vacuum in the system, when operating the motor at full power and / or temperature conditions, it can cause collapse of 5-Gal bucket of durability 90 mil. It is not dangerous and easy to remove, if you put the motor section in an additional bucket (bucket-in-bucket). Note collapse does not occur at lower workloads.
So, if you:
- Load the reactor above the permissible loading
- Are not able to manage the process of metal dissolution at Refining
- Did not pay attention to that concentration of lye solution in both sections of the neutralizer is already below the minimum
Then fumes will go into the motor compartment of the device, which is on the outdoor. Of course, the motor will not be able to operate a long time in an acidic environment and gradually (not directly) has to stop. Therefore, an additional reserve motor section is provided. It's advisable to install this section next to the Device. Why?
Unfortunately, members of the GRF did not notice that the neutralizer is a universal unit. For example, when using the Device (not in a fume hood), refiners would be able:
- Process filings in Muriatic acid to remove iron
- Precipitate metal with zinc in platinum and palladium refining
- Capture sulfur dioxide gas at sodium metabisulphite treating
- Boil (!) sweeps in concentrated lye to remove abrasive material
- If you replace lye solution for acidic one, in some cases refiners would be able to work with ammonia at washing of diamonds from silver oxide without the hood.
Experienced Refiners can continue this list.
In addition, at refining some type of Gold waste (e.g., Gold filled nylon filters) there is a characteristic smell of nitro compounds. Then you should use the motor compartment, remote from the working space.
Thus, the two motors can be operated alternately depending on the task. Motor blocks can be switched using 3/4 in. PVC Slip Ball Valve, mounted on one sections of the neutralizer (see. pic).
What if there was a power failure. This problem is solved by using UPS. In our case, you need to purchase, for example, "APC BR1500G Back-UPS Pro with BR24BPG External Battery Pack" or simply "APC BR1500G Back-UPS Pro 1500VA 10-outlet Uninterruptible Power Supply". Then during a power failure, 7a motor will continue to run for at least 10-15 minutes. That's enough to dilute the reaction mixture in twice with cold water and prevent the gas emission after stopping the motor. (Since the reactor is under a weak vacuum, it is not dangerous to open it).
The device is ready to ship and I wait your decision. Of course, it's not necessary to return the kit. The Device and shipping are free.
Thank you again. I look forward to hearing from you very soon.
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