2results 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 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.