The iX500 is not really designed for quality scanning of photos. For lots of photos that you want to keep and remember in high quality, adjusted for color balance/correction, I’d strongly recommend choosing either a photo scanner (which you don’t own), or scanning with digital camera, or using a scanning service.
I know two people who sent Scancafe (AKA GoPhoto, or ScanDigital) thousands of pics and negatives total, and were happy with the results. Scancafe scans photos at 600dpi, as well as negatives and slides at 3000dpi, and the unit price is 21¢-31¢ in their ‘value kit’. These types of services usually give you a link to low-res previews so you can approve (or reject images and ask for re-scan) before being sent a DVD of images.
Two years ago Wirecutter reviewed several scanning services (but not Scancafe) and wrote about the pluses and minuses and their recommended service:
https://thewirecutter.com/reviews/the-best-photo-scanning-service/
iMore posted an overview this year:
If I had the time (I don’t) and wanted high quality scans at home the best option is ‘scanning’ with a digital camera. (And I’d still need to do batches of post-production adjustments to the images anyway.) Here’s a good overview video on the process involved:
And a good article from B&H Photo on the subject: