Characterization And Removal Of H₂S Over Manganese Nodule Leached Residue

The calcined products of manganese nodule leached residue are ideal desulfurization material with nano-characteristic, large surface area, strong chemical activity, and the principal constituent of Mn4+.The purpose of this project is to develop a application technology over the ocean manganese nodule leached residue by its mineralogy character which can remove H2S and malodorous gas by H2S, mercaptane, thio-ether primarily in the natural gas, the coal gas and the nitrogenous fertilizer industry converted gas.This paper researches characterization of ocean manganese nodule and ammonia leached residue firstly, then analyses the best calcination conditions of oxidative decomposition over ammonia leaching residue through experimental, and studies some factors effecting desulfurization such as mineral partical size, calcined temperature, etc. in the desulfurization experiment using calcined products of ammonia leaching residue, and deduces the desulfurization reaction mechanism from the analysis of desulfurization products and desulfurization exhaust gas. The ammonia leaching residue contains 23.38 % total manganese and 5.80 % total iron, and the calcined product at 480℃contains 27.01 % total manganese and 40.45 % MnO2, oxidation degree 3.80, specific surface area about 135.9 m2/g,. Carrier gas, mineral partical size, calcined temperature, moisture all will effect the desulfurization. The desulfurization capacity can excess 310 mgS2-/ (g·calcined product) when mineral partical size is <0.125mm, calcined temperature is 480℃, the carrier gas is moisture- bearing. Renewable time of desulfurization agent can be up to 5, and the total desulfurization capacity can excess 974 mgS2-/ (g·calcined product) using 1.000 g calcined product at 480℃.