Ivanov and Tzarukaeva won men’s under 94kg and women’s under 63kg silver medals at the Games, while double men’s 94kg European champion Demanov finished fourth in his event.
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Other London medallists revealed on Wednesday (NZT Thursday) to have failed tests included Iryna Kulesha of Belarus, Armenia’s Hripsime Khurshudyan and Moldova’s Cristina Iovu.
The trio all claimed bronze medals.
The International Olympic Committee (IOC) said on Friday that 45 athletes had failed dope tests after their samples from the 2008 Beijing Olympics and London 2012 were reanalysed.
“The integrity of the weightlifting sport has been seriously damaged on multiple times and levels by the Russians”, the IWF said in a statement.
Bulgarian weightlifters have been banned from the upcoming Rio de Janeiro Games because of the large number of positive doping tests, and now Russian weightlifters are also at risk of being banned.
The banned hormone and metabolic modulator tamoxifen was detected in Ivanov’s sample.
The IWF has imposed mandatory provisional suspensions on all 11 athletes, including Georgia’s Rauli Tsirekidze, who was due to compete in Rio.
Individual sport federations must rule on whether Russians can compete in Rio following the country’s doping scandal.
Over 100 Russian athletes have so far been banned from the Games after the World Anti-Doping Agency uncovered an elaborate doping system directed by Russia’s sports ministry across more than 30 sports.
In total, 13 weightlifting medals won in London have now been tainted by doping, comprising four gold, four silver and five bronze.
Meanwhile, the Thai weightlifting team left for Rio yesterday. The London 2012 retests produced 15 failures.
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It followed Kazakhstan’s men’s under 94kg gold medallist Ilya Ilyin, women’s under 63kg victor Maiya Maneza and under 75kg champion Svetlana Podobedova having tested positive, although the final outcome of these cases are yet to be confirmed.
