chee guan Wong

6 Questions 10 Answers 0 Followers

Questions related from chee guan Wong

How can I better remove silica ( about 20 to 70 ppm in both colloidal and dissolved state) in wastewater containing 33wt%PEG?

silica / silicon is an unwanted impurity in our recycling process , how can we better remove silica / silicon without usage of chemicals?

30 January 2015 6,946 5 View

Is it normal to see a TOPAS reporting high amorphous content even with highly crystalline samples?

After spiking the product samples (SiSiCar M) with alumina ( Sigma-Aldrich 265497-25G) is it normal to see such high amorphous content even though the base line seems flat from the scanned...

13 November 2014 2,222 3 View

Is there a way to analyse metallic Si in SiC aside from using the Fedorov method?

We tried using Fedorov's method for analyzing metallic Si content in a mixture of silicon carbide, silicon oxide and silicon but each run gives different results due to operator differences and...

31 March 2014 8,387 4 View

Decreases in pH after the addition of DPG to DIW?

pH of pure DPG is around 4-5, DIW around 5.50, but when both are mixed together in 9 part DIW with 1 part vol DPG the pH drops to 3.49. What could be the explanation for this observed change in pH?

27 March 2014 644 4 View

Why does the conductivity decrease in wastewater containing PEG?

Should conductivity decrease for mixtures of water and PEG after exposure to atmospheric oxygen? Oxygen should be able to attack the ether bonds in PEG and give rise to increased conductivity,...

11 February 2014 4,827 13 View

What are the recycling methods for slurry after diamond wire sawing?

I would like to know if there are any recycling methods of spent slurry after slicing silicon ingots using diamond wire sawing.

13 November 2013 7,219 1 View