Synthesis Of Zeolite 4a From Natural Clinoptilolite Mineral And Bauxite Minerals

Zeolite 4A is widely used in the field of agriculture , petrol chemical industry, macromolecule chemical industry, cement industry, paper making et al. And at present, laundry detergents is the widest use of zeolite 4A.In the past decades, Sodium Tripolyphosphate (STPP) was the detergent which is most used. Now, the environment problems brought by STPP are noticed more and more. Because of high whiteness, high calcium ion exchange capability, and low price, zeolite 4A has been the best substitute of STPP.Zeolite 4A is produced by chemical materials such as Al(OH)3. But the price chemical materials with aluminium is high in our country, so producing from the cheap mineral becomes an inevitable choice.At the present time, the mineral is used mostly as active accessorial material of cement. Besides, it was used to remove NH4+,Cs+ and the other metallic ion in the sewage, or used as additive of feed, catalyst of organic reaction et.al. Some of these products have low additional value, and some products have low effect because of the existence of impurity.In this thesis, the natural zeolite mineral was analysed and discussed fully. High quality bauxite was used together with the mineral to synthesize zeolite A, on the base of the preceding study. And microwave technology was used to treat the natural zeolite mineral and bauxite, and synthesize zeolite A.The work and results are as follows:1,According to the analysis of the natural zeolite mineral and bauxite, the component was got. After the experiments of calcination in the air and in the water vapor, we found that the structure of the natural zeolite mineral can be changed partly. To completely active the mineral, we tried the methods of direct alkli solution and alkli fusion. We found that the method of alkli fusion can make the most mineral change, while the method of direct alkli solution can change the mineral partly. To get high quality Na2SiO3 solution, we add the process of hydro-flotation and acid treatment before alkali treatment. The effection is clearly. Besides, the recycle of acid and aluminium is studied.2,The component of two kinds of bauxite, one from HH, the other from GZ, was got according to the analysis of EDS. Then we tried the methods of direct alkali solution and alkali fusion. We found that more NaAlO₂ can be got from the bauxite of GuiZhou using the method of alkali fusion.3,NaAlO₂ solution and Na2SiO3 solution, which were made by the pre-process, were used to synthesize zeolite A. And the condition of synthesis was optimized. And microwave technology was used to treat the natural mineral and bauxite. We also use the microwave technology to synthesize zeolite A, and the size of zeolite A is smaller.