How do I make use of used cat litter?

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I clean my cat's litter box regularly. Discarding all the clumps of refuse. However when I change the litter I have a lot of litter still left over that has tiny particles of cat refuse I suppose. Is there any use of this used cat litter? Is there any value to gardening or making a cement type thing out of it or something? I'm not a genius I need a geniuses help. Or I could just throw it away.

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