On the basis of the basic principle of chemical sedimentation process, the chemicalsedimentation process that treats sulphide in acetylene sludge wastewater using FeSO.

Recovery of magnesium ammonium phosphate from ammonia nitrogen wastewater by chemical precipitation;

Production of ZnS from flue gas SO_2 through the combined processes of microbial transformation and chemical precipitation;

Mathematical model for treating electroless nickel plating wastewater by chemical precipitation and its application;

Influence of high temperature aging on precipitation strengthening of Ni-based superalloy;

The industrial trial that rolling 590 MPa grade automobile beam steel by using of 510 MPa grade billet was carried out,and the rolling process principles of improving performance through grain refining and precipitation strengthening for V-microalloyed steel was analyed.

Results show that such kind of alloy, after aging treatment at 450 ℃ for 4 hours, can reach the maximum strength, and Cr will influence the property of alloy by precipitation strengthening.

SO42-was removed by the chemical deposition techniques,and COD was then removed by the batch Anaerobic Hydrolysis-acidogenesis-Aerobic biotechnology which was performed under different influent organic loads adjusted by changing HRT and MLSS.

Pilot scale and lab scale experiments were conducted to pretreat the ion exchange wastewater (the main part of the monosodium L glutamate (MSG) wastewater) by means of Fe C deoxidization to increase the pH and biodegradation, lime counteraction and aeration by air or chemical deposition to remove ammonia.

The paper introduced the method and the theory of Lead Sulfide film preparation——Chemical Deposition and analyzed the reason of outshoot cling to the surface of Lead Sulfide film during the process of chemical deposition.