Analysis of the poisoned ion exchange resin proves that the pollution of ion exchange resin by iron compound is the main reason leading to exchanging ability reduction.

This paper is aimed at introducing the authors' research of the spontaneous combustion characteristics of iron sulfides as a result of the reactions of hydrogen sulfide to the different degrees of humidity of the iron oxide black, iron oxide red and the iron hydroxide.

The results indicated that application of iron compounds at both the levels significantly increased plant height, straw yield, number of total and fertile tillers pot .

Based on the study of iron-mineralization characteristics in sandstone near of uranium mineralization occurrence in Longtan syncline,Sichuan basin;the iron were analyzed by means of optical microscope and electron probe micro-analyser(EPMA),it can be roughly classified into three kinds,as clastic magnetite、cementitious hematite、skinny limonite.

Hydrogen sulfide,often present in sulfur-bearing crude tankers,can react with iron to form various sulfides like ferrous sulfide,ironic sulfide and ferrous disulfide,the tendency of which react with oxygen in air to form potentially explosive mixtures.