i have submit visa application before 6 days still not receive Chinese visa why that!

we have submit visa application before 6 days ago. but still not receive .my visa receipt no.is 21888333.

we have government bank supply 500 nos tractor .we want to discuss with china company
already reserve flight seat to day.
i want to know what is the reason delay our visa

Thanking you
Saman Indrawansa