Oil removal in hydrometallurgy
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I would like to ask the experienced colleagues: apart from ultrasonic waves and fiber ball degreasing, are there any other techniques that can be used to address the degreasing issue in non-ferrous metal smelting?
Using air flotation or an oil separator is also an option; the latter is widely used in some small and medium-sized factories due to its low cost and practicality.
First, it is necessary to ensure phase continuity during extraction and back-extraction in order to reduce organic entrainment. However, entrainment is inevitable, so oil removal facilities need to be added. For extraction, baffles are generally added to the raffinate tank to allow the liquid to flow beneath them, thereby increasing the phase separation time; the number of baffles depends on the flow rate. For the back-extraction liquid, oil can be removed by using ultrasonic air flotation combined with fiber ball filtration; after such treatment, the organic content carried along will not exceed 60 ppm, which meets the process requirements.
There is a new type of oil removal equipment that allows the oil content in the extract to be reduced from 130 mg/L to 5 mg/L through filtration; with a two-stage process, this level can be brought below 2 mg/L. It is an excellent choice for products that require high standards. Those in need can contact me. Email: djg1208@yahoo.com.cn
Are there any other methods besides ultrasonic air flotation plus fiber ball filtration for oil removal? It doesn’t seem like this method is very ideal. This post was last edited by limingshuguang on 2009-4-25 09:19.]
Generally, it involves multi-stage static separation and activated carbon adsorption. More industrialized.
I have sent an email to your inbox; please check it. This post was last edited by limingshuguang on 2009-4-25 09:19.]
The oil removal method using ultrasonic air flotation combined with fiber ball filtration has been operating smoothly since the end of 2005; no quality issues have occurred with the copper plates. Additionally, a sand filter can be used, with pomegranate seeds and anthracite as filter media. PVC sheets can be drilled to serve as backing plates, upon which stainless steel wire mesh and geotextile are laid to prevent leakage of the filter media. The problem is that the filter media need to be cleaned every two months or so, which affects production. However, the fiber ball filtration plus ultrasonic air flotation system allows for automatic backwashing, thus not disrupting production. Therefore, I still recommend this method.
Air flotation for oil removal can be used, but the short-term cost investment is relatively high. Oil can also be removed using activated carbon, and the process is simple. . It has an excellent oil-removing effect. .
Reply: The new oil removal device basically does not require shutdown for cleaning; it only needs to be treated during maintenance of the entire production line. It offers good oil removal performance, low operating costs, and can operate for a long time. I have photos for comparison.
I’ve seen the photos; it seems that the amount of impurities after processing is very low. I hope to learn more about this in the future. This post was last edited by limingshuguang on 2009-4-25 09:20]
It seems the picture was posted in another thread; from this, it can be seen that the device is quite advanced. I don’t know under what conditions what was mentioned on the 10th floor needs to be carried out This post was last edited by limingshuguang on 2009-4-25 09:21.]
I’m not sure what effect the original poster is hoping to achieve. Our company has carried out oil removal from nickel sulfurous acid extracts at Jinchuan Group, and the oil content in the effluent can be kept below 2 ppm. The installation has been in operation for two years, with stable oil levels in the effluent. If you are interested, you can add me on QQ at 499685280 or send me an email at saint-liang@hotmail.com
In addition to the methods mentioned above, an imported oil-absorbing cotton can also be used; it is placed in the aqueous phase to absorb oil droplets, which can then be recovered from the cotton. However, the cost is extremely high.
Is the effect the same as that of activated carbon? This post was last edited by limingshuguang on 2009-4-25 09:21.]