4results about How to "Reduce sodium oxide content" patented technology

This application relates to a silicon-modified macroporous pseudoboehmite and its preparation method, belonging to the technical field of pseudoboehmite preparation. The method includes: mixing an aluminum salt solution and a sodium aluminate solution in parallel flow and performing a low-temperature neutralization reaction; adding a low-concentration water glass 5-8 minutes after the start of the reaction, ensuring the water glass addition ends before the neutralization reaction ends, to obtain an amorphous precursor; separating the amorphous precursor into a liquid and solid state to obtain a filter cake; mixing the filter cake with deionized hydrated slurry to obtain a slurry; adding sodium carbonate to the slurry to adjust the pH to 8-9 to obtain an alkaline slurry; subjecting the alkaline slurry to an aging and crystallization reaction at high temperature to obtain a pseudoboehmite slurry; filtering and washing the pseudoboehmite slurry to obtain a silicon-modified macroporous pseudoboehmite filter cake, and then drying it to obtain silicon-modified macroporous pseudoboehmite.

The invention belongs to the technical field of preparation of aluminum hydroxide micro powder, and particularly relates to high-heat-resistance aluminum hydroxide micro powder as well as a preparation method and application thereof. According to the preparation method, a grinding method seed crystal and a directional induction decomposition process are adopted, so that the crystals grow in an inert manner, the single crystal growth of aluminum hydroxide particles is enhanced, and the content of sodium oxide coated among the crystals is effectively reduced. According to the method, the ammonium salt dispersing agent is added in the seed crystal preparation stage, the prepared seed crystal is finer and more uniform in particle size and better in dispersity in a later reaction system, the particle size distribution of micro-powder aluminum hydroxide which grows up through decomposition is narrow and uniform, D97 is smaller than or equal to 5 micrometers, and the content of the micro-powder aluminum hydroxide is smaller than or equal to 20 ppm when the particle size is larger than 45 micrometers. According to the invention, an ammonium salt dispersant is added into the washed aluminum hydroxide, under the same particle size, the prepared aluminum hydroxide crystal has the advantages of perfect morphology, high dispersibility, low sodium oxide content, high heat resistance, 2% water loss temperature of more than or equal to 257 DEG C, and realization of imported substitution in the industry of high-end micro-powder aluminum hydroxide for copper-clad plates.

The invention belongs to the technical field of dissolution of bauxite, and particularly relates to a low-alkali-consumption dissolution method for bauxite with high chlorite content. Carrying out phase detection on the bauxite in each ore spot, respectively using the bauxite according to the types of the ore components, independently stacking the bauxite with the chlorite content higher than 10% for use, and independently dissolving out the bauxite. In the high-temperature dissolution process of the high-chlorite bauxite, chlorite does not react with sodium hydroxide to generate sodium silicon slag, the content of sodium oxide in the red mud is low, and alkali consumption in aluminum oxide production is low.

The present invention relates to a method for preparing a catalytic cracking catalyst without ammonia nitrogen pollution, which comprises mixing an unmodified NaY molecular sieve with a binder, clay and water, beating and spray drying, and calcining to obtain catalyst microspheres; then, performing ion exchange modification, moderate hydrothermal ultra-stable modification and SiCl4 gas phase ultra-stable modification. The preparation method is a method for preparing a catalytic cracking catalyst without ammonia nitrogen pollution. The method can not only prepare a catalytic cracking catalyst with larger pore volume and specific surface area, better strength, stronger heavy oil conversion ability and good coke selectivity, but also, there is no ammonia nitrogen pollution in the whole process of catalyst preparation, which effectively solves the ammonia nitrogen pollution problem that needs to be solved in the production of catalytic cracking catalysts.