Comparative study on properties of zinc ferrite and its purified products

In this paper, aimed at the zinc ferrite products from the gossan bearing-zinc ore by direct roasting and their sulfuric acid leaching products, the differences of related products in element composition, mineral composition, specific surface properties and particle morphology were studied. The results show that the XRD diffraction peaks of low content zinc ferrite products are more complex and have more impurity peaks than those of high content zinc ferrite products and less impurity peaks. The XRD patterns of leaching residue have little difference after sulfuric acid leaching purification, but the high content zinc ferrite products have higher crystallinity, the diffraction peak of zinc ferrite from leaching residue is stronger. That is to say, the content of zinc ferrite in the roasted product will not affect the final purification effect by sulfuric acid leaching purification. The phase composition of the purified product is similar, which the main component is zinc ferrite, and contains impurities such as gangue minerals. The adsorption-desorption curves of two purified zinc ferrite products are of type III, but the curves of two products are different. The specific surface area of sample 1 is 9.66 times that of sample 2. The Pore volume and average pore diameter are 8.14 times and 1.97 times, respectively. Therefore, the purified zinc ferrite products with low content of zinc ferrite will have more application potential as adsorbents. There are relatively few soluble impurities in the high content zinc ferrite products, so the micro-morphology of the samples has little change after leaching. However, there are more soluble impurities in the low content of zinc ferrite. After leaching purification by sulfuric acid, the position of the soluble impurities becomes pore, the large particles are decomposed and the particles become finer.