a leaching solution then adding 50 60 kg slaked lime to per cubic meter of the leached solution to carry out decarburization with heating and carrying out purification and impurity removal and then refining treatment according to the method the ammonia process is used for treating smoke and dust and the existing ammonia process is adaptively improved the leaching speed and the leaching rate of zinc in the smoke and dust are improved and the zinc oxide with the purity of more than 99 7 can be obtained the treatment method of the present invention is characterized by low energy consumption and high efficiency the leaching agent can be recycled and thoroughly solves the problem of zinc load of steel plant furnace smoke and dust thereby meeting the requirement of the steel plant on purification of the harmful components comprising zinc and alkali metals and achieving good production circulation application_number US 201214430549 A description the present invention is further described in details with the embodiments one skilled in the art will understand that the embodiment of the present invention as shown in the drawings and described above is exemplary only and not intended to be limiting raw material 1 steel plant smoke and dust from kunming the.