How can I combine Quorum and Zero Knowledge Range Proofs
Now there are a lot of interesting variants of Zero Knowledge Proofs with and without trusted setups. The traditional ZK SNARKS had a requirement for a trusted setup and demanded larger proof size and prover time and verifier times. However in the recent times Bullet Proofs have reduced the proof size significantly. ZK STARK is a recent Zero Knowledge Proof technique that has introduced transparent Zero Knowledge Proofs. Please find reference to two Zero Knowledge Proof based Toolsets implemented on JPMorgan Quorum protocol in the recent times. 

ZSL on QUORUM

Anonymous ZETHER