(Recasts; adds vote results for shareholder deal in paragraph 2, description of business in paragraph 4)

SYDNEY, Dec 19 (Reuters) - Investors in Australian lithium producer Allkem voted on Tuesday to accept a $10.6 billion merger offer from U.S. giant Livent that would create one of the world's biggest lithium companies.

Proxy votes for the deal indicated 53% of Allkem shareholders had voted, with 89% of those in favour, said Allkem Chairman Peter Coleman. Final results will be announced to Australia's securities exchange later on Tuesday.

Livent last week said it had received all regulatory approvals for the deal to proceed that will create a company called Arcadium Lithium. Its shareholders will vote later on Tuesday.

Arcadium Lithium will have a sprawling footprint across major producing regions Australia, Argentina and Canada, and will operate across the supply chain from mining to delivering finished chemicals to battery-maker customers.

Under the deal, Allkem shareholders will get one share in Arcadium Lithium for each of their shares, and they will ultimately own 56% of the new firm.

Livent shareholders will get 2.406 shares in the new firm for each existing share and Livent CEO Paul Graves will take the top job.

The new company will be the world's third-biggest producer of the key metal used in electric vehicle batteries, behind U.S.-based Albemarle and Chile's SQM.

The transaction has been recommended by independent experts in a report compiled by financial advisors Kroll. Major proxy advisory firms have also recommended investors vote in favour of the deal. Livent's Graves told Reuters in November the new company would be keen to expand its existing asset base in Western Australia's world-class lithium districts. (Reporting by Scott Murdoch in Sydney and Melanie Burton in Melbourne; Editing by Christopher Cushing)