Several people have been arrested and released without charge after gluing themselves to a Brisbane road during a protest against the Queensland Government's approval of the Adani coal mine.

Key points: More than 700 protesters march through Brisbane city, to end at the ABC headquarters in South Brisbane

More than 700 protesters march through Brisbane city, to end at the ABC headquarters in South Brisbane They stopped shortly on the Victoria Bridge, bringing peak-hour buses to a standstill

They stopped shortly on the Victoria Bridge, bringing peak-hour buses to a standstill They had demand a live-cross at the ABC headquarters

More than 700 people rallied in the state's capital on Friday evening, marching over one of the CBD's main bridges at peak hour and causing major delays.

They were calling on the State Government to "tear up the contracts" and "revoke" approvals for the mine, a week after the controversial project passed its final environmental hurdle.

Queensland Police said the large crowd was mostly peaceful, however six men and one woman were arrested and detained for breaching the peace.

Of the seven, five glued themselves to Russell Street in South Bank before being removed by police.

No charges have been laid.

Two protesters who glued their hand to the road. ( ABC News: Kate McKenna )

Greens councillor urged protesters to 'get arrested'

Speaking at the protest's starting point in the CBD's Brisbane Square, Greens councillor Jonathan Sri told the crowd they would not be able to stop the project "without mass civil disobedience".

"Right now what we need is as many people as possible who are willing to get arrested, who are willing to put their bodies on the line," he said.

"This is people power on the ground.

"You need to mobilise on the streets in large numbers."

The protesters gathered at Brisbane Square in the CBD before marching across the river during peak hour. ( ABC News: Kate McKenna )

The rally's organisers, Students for Climate Justice and Movement Against Destruction, said the Government's decision to approve Adani's groundwater plan for the mine was an "absolute disgrace".

"It will spell the end of the Galilee Basin and cause irrevocable destruction to million-year-old ecosystems," organiser Catherine Robertson said.

"We will not stand idly by whilst the Government makes decisions that are hurtling us toward a point of no return on the environmental crisis."

Bob Carnegie from the Maritime Union Australia (MUA) urged the crowd not to lose hope.

"We keep fighting, we keep struggling, we are pro-worker, we are pro-unions … it's up to us to save the world," he told them.

Anti-Adani protesters gathered near the ABC headquarters in South Bank after marching from the CBD. ( ABC News: Kate McKenna )

Peak hour traffic brought to a standstill

Protesters gathered from 4:00pm (AEST) in Brisbane Square and listened to the speeches before heading across the Victoria Bridge about 6:00pm.

Buses were brought to a standstill as the crowd staged a sit-down on the bridge.

A second sit-down was held on the corner Russell and Grey streets outside the ABC's South Bank office where the group had wanted a live-cross in the 7:00pm TV bulletin.

Queensland Police said the last road closure in South Brisbane ended at about 9.20pm.