Abstract：This paper studied process conditions of acid extraction of calcium from red swamp crayfish waste, compared the different effects of kinds of process conditions. It is confirmed by experiment that the best condition to extract calcium was ： organic acids with dry red swamp crayfish powder weight ratio of 1 ： 1, usage of organic acids mole ratio as： citric acid： malic acid： lactic acid = 2： 3： 6, extraction time of 5h, extraction temperature of 30℃, the extraction rate of cal...
