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My colleague Alex has kindly passed this across to me to deal with.
As Alex has stated above, it should not be a problem obtaining a replacement visa, however, in order to first do so, you need to obtain a replacement Passport from the Kazakhstan authorities.
If this is not possible, you will have to apply for a Biometric Residence Permit and then subsequently a No Time Limit (NTL) endorsement, which will be endorsed on an Immigration Status Document.
Once this has been issued, you will be able to travel to your home country and then obtain a replacement passport.
I hope this answers your question. If so, kindly click accept.