Dairy Nutrition, in an article for (accessed July 23, 2018) titled "Calcium and Iron Absorption: Is There an Interaction?," wrote:

“Evidence suggests that calcium does not have any significant long-term effect on iron absorption. In addition, milk and milk products have not been found to affect iron absorption…

In a randomized crossover trial over 4 days, the consumption of a glass of milk with 3 main meals, or the consumption of calcium-fortified foods providing an equivalent amount of calcium, did not inhibit nonheme-iron absorption. In another study, it was found that the addition of milk or yogurt to a plant-based diet did not affect iron bioavailability [the degree to which a nutrient is absorbed and utilized by the body].”

July 23, 2018