Antonyms for the word "placing disposal" can be viewed in two different aspects - antonyms for placing, and antonyms for disposal. If we take the former, then antonyms such as removing, extracting, taking, or lifting can be used. These antonyms indicate the action of taking something away as opposed to putting it somewhere. On the other hand, if we consider antonyms for disposal, then words like accumulation, hoarding, collecting, or stockpiling come to mind. These words are the opposite of disposal, which means to get rid of something. Therefore, depending on the context of the sentence, different antonyms can be used for placing disposal.