You can recover your coins with mnemonics and passphrase(If you have) on any other wallets that are based on the BIP-39 Protocol standard.
The private key is stored encrypted on the cold wallet, it is invisible. If you want to export the private key, you must first turn it into a hot wallet be follow steps:
1.Select "Import Account" on the ELLIPAL App
2.Import by mnemonics, fill in the information as required to import successfully.
3. Then your wallet becomes a hot wallet, and you can find your private key in "Export Private Key".