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Diatomite is a siliceous diatom remains and other microorganisms composed of biological chert, with a huge surface area and strong adsorption properties. Diatomaceous earth as a new natural microporous material with wide range of sources, sewage treatment effect, subsequent sludge treatment equipment and simple, its application prospect. This paper studies the modification process using diatomaceous earth, and modified preparation process, each new forms prepared under modified diatomite ferric ion adsorption properties of impact studies, preliminary draw for the preparation of modified diatomite optimum conditions. Wastewater through adsorption Modified Diatomite (artificial preparation) of Fe3 ions adsorption experiments investigated modified diatomite dosage, reaction time, adsorption temperature, solution pH, Fe3 ions initial concentration on the adsorption effect, too Adsorption of Modified Diatomite ferric ion optimal conditions; utilize modified diatomite formation of a combined process of iron-containing industrial wastewater. The main results are as follows: a) in the preparation of modified diatomite, different ratio, different calcination temperature and calcination time is the impact of the modified diatomite adsorption properties of the main factors, the ideal process conditions: ratio of proportion of diatoms original soil was 80%, calcination temperature was 500 ℃, calcination time 90min. 2) the optimum conditions according to new forms of diatomaceous earth was prepared as follows: a certain strength, the size of uniform size, particle size of about 5mm, the color is yellow small round particles 3) in a certain range, Diatomite the removal rate of the ion Fe3 volume with soil, adsorption time and adsorption temperature, the pH value is increased, with the initial concentration of the adsorption solution increases. 4) orthogonal experiment to study the amount of modified diatomite, pH, temperature, Fe3 ions initial concentration of modified diatomite four factors Fe3 ions adsorbed combined effects of various factors on the adsorption properties of from the main to the second order: modified diatomite dosage gt; Fe3 ions initial concentration gt; pH value gt; temperature optimum adsorption conditions for the diatomite dosage 10g / L, Fe3 ions initial concentration of 50mg / L, pH value 4.0, temperature 40 ℃. Under optimal conditions for Diatomite [Fe3] = 100mg / L water adsorption experiments, the results show that the diatom Fe3 ions on the original soil removal efficiency of only 86.73%, while the modified diatomite Fe3 ions removal efficiency up to 99.51%, the removal rate increased by Diatomite 12.78%. 5) the use of modified diatomite pilot studies to Zhuzhou Yongli Chemical Co., Ltd. as the source of water waste water treatment agent as modified diatomite, combined processes carried out, the results showed that the modified diatomite treatment of acid Suitable metal processing only low concentrations of water, not directly deal with heavy metal wastewater of high concentrations of acid, adjusting the pH, it can remove some pollutants, the processing system can As, Pb, Cu, Cd, SS, Cr and Fe3 ions good removal effect, effluent quality is good. After a combined process of treatment, some contaminant ions has been close to 99% of the total removal of pollutants also meet all compliance rate of 98%. The research results to guide the application of diatomite iron industrial wastewater treatment has some reference value for the application of diatomaceous earth to provide a theoretical basis and technical support.
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