The Preparation And Application Of New Type Phosphate And Nano-Magnesium Oxide

New type inorganic materials are prepared by technique and certain methods which include solid-phase reaction and liquid precipitation etc. In liquid phase conditions it is the most common way to synthesize new type inorganic materials using liquid precipitation which uses the substance dissolving in water to produce insoluble substance. Then the products are heated to dry or calcined at high temperature, Finally the needed inorganic new material is prepared. Liquid precipitation mainly has direct precipitation, co-precipitation and homogeneous precipitation. With its advantage of simply processing, low cost, this method is easy to be expanded, even ready for industrial production to get simple or composite ultra-fine powder. The paper focuses on how to use liquid precipitation to synthesize new type phosphate salt and nano-magnesium oxide.New type electrode material-lithium iron phosphate is of great stability, safety and circulation. Besides, iron resources is abundant, meanwhile the price is low, which makes it the best option to be battery positive materials. However the solid preparation method is too complicated, while Fe2+is easy to be oxidized during the process of wet method. So the preparation and the application of lithium iron phosphate electrode materials is limited. The synthesis methods mainly have high-temperature solid-state reaction. In hydrothermal method, the compounds are put in the hydrothermal reactor. The high pressure makes the substance which is insoluble and indissolvable recrystallize. Phosphoric acid and lithium carbonate is cheap and easy to get. And coprecipitation is much easier compared to wet method.The property and security of metal anti-corrosion coating material have been discussed widely. Phosphate, as a new alternative material, first of all the toxic level is much lower than that of chromate, besides it doesn’t produce gas which is harmful to human and environment. The prepration of traditiona anti-corrosion phosphate is using Zn(PO4)3as main body paint, waterborne epoxy resin as emulsion, styrene-acrylic latex or other organic solvents as base stock, amino epoxy-amine bonus content (DETA) as curing agent. Besides, defoaming agent, corrosion inhibitor, thickener[3,4] are mixed to emulsify. The operation procedure is very complicated, and chemical reagents demand very high. The paper focuses on the preparation of new type soluable phosphate, after which dissolves in water, stabilizers are added, then the corrosion resistant fluids produces.Coprecipitation method is used to prepare nano magnesium oxide,the advantage is the easily obtained raw materials, simple process, low requirement on equipment, easy and suitable for industrialization production.The thesis use liquid phase synthesis method to prepare inorganic materials, and the process is quite simple. The optimal conditions are discussed here.1. LiFeO4prepared by co-precitationNew type lithium-ion cathode materials LiFeO4was prepared by co-precitation, coated by carbon, and examined by XRD, AFM, LSD to analyze the crystal structure and microstructure of the products. Different carbon sources, the amount of different glucose, calcination time were studied. The results showed that the synthetic product was a new type spherical lithium iron phosphate, the carbon can effectively control the size of the particles. Using lithium carbonate as lithium source, with10%glucose, then calcinated products at650℃for12h.The lithium iron phosphate with a good reversibility was prepared.2. The study of new type phosphate’s performance on anti-corrosionUsing zinc oxide, aluminum oxide, phosphoric as raw materials, by controlling the molar ratio of the reagents, to get clear zinc dihydrogen phosphate、zin, and caluminum dihydrogen phosphate solution. Then the products were crystallized to obtain corresponding dihydrogen phosphate salt. The amount of zinc and aluminium were examined demarcated by EDTA. The amount of P was determined by spectrophotometry. Dissolving dihydrogen phosphate salt in water with addition of silicon dioxide to prepare antirust coating materials, which can be coated on the metal surface. The antirust performance was tested using salt spray test after drying. The experiments showed that using new kind phosphate, stabilizer, silicon sol to make phosphating liquid which was coated on the steel plate is a facile way to prepare anti-rust materials. The molar ratio of Zn2+:PO43+was approximately1:2.5.With the speed of feeding in raw material0.5g/min, dihydrogen phosphate zinc was produced, with the average particle size4um. The antirust performance was tested using smoke test which showed the results went well. Then aluminum hydroxide was added, the aluminum dihydrogen phosphate with better antirust performance was produced.3.The study of using brine and industrial oxalic acid to prepare nano-magnesium oxideUsing brine and industrial oxalic acid as raw materials adjusting pH to prepare nano-magnesium oxide. The influences of the calcination temperature, the reaction temperature, reaction time, brine concentration, and the amount of surfactant on the particle size were studied to determine the optimal preparation conditions. The study showed that when the brine concentration was1.5mol/L, and lml CTMAB was added in every250ml MgCl2solution reacting at40℃for20min, intermediate product produced,then calcinated at600℃for2h. Then nano-magnesium oxide was produced with the particle size50nm.