Method for Producing a High-purity Nanometer Zinc Oxide from Steel Plant Smoke and Dust by Ammonia Decarburization

摘要

Disclosed is a method for producing a high-purity nanometer zinc oxide from steel plant smoke and dust by ammonia decarburization. The method comprises: leaching with an ammonia water-ammonium carbonate solution as a leaching agent, adding 0.3-0.5 kg of sodium fluorosilicate to per cubic meter of the leaching agent to obtain 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.