Preparation method of aluminum sol for chemical binder

Abstract

The invention discloses a preparation method of aluminum sol for chemical binder. The preparation method comprises the following step of: preparing aluminum soil by using industrial hydrochloric acid, aluminum ingot with purity of more than 99% and water, wherein the mass ratio of the added aluminum ingot to the hydrochloric acid to the water is 10w%-40w%, 15w%-35w%, 40w%-60w%; the reaction temperature is 85 DEG C-95 DEG C; in the prepared aluminum soil, the content of aluminum is 10%-15%, the content of chlorine is 7%-15%, the aluminum-chlorine ratio is 1.33-2.3, the content of aluminum oxide is 20%-28%, the pH value is 2.6-3.8 and the density is 1.2g/cm<3>-1.6g/cm<3>, so that not only can the Al/Cl ratio be improved, but also the content of other metal impurities in the aluminum soil are reduced. Besides, the adding of hydrochloric acid is controlled by a flow rate meter, so that not only can the whole reaction velocity be controlled, but also the whole process can be controlled to carry out under a relatively stable pH, and therefore, the corrosion to the device is lowered.

Description

technical field [0001] The invention relates to a preparation method of aluminum sol, in particular, it is suitable for the preparation method of binder used in chemical industry. Background technique [0002] Alumina sol is a colloidal solution in which charged hydrated alumina particles are dispersed in water. It is widely used as a forming binder for high temperature resistant materials such as petrochemical surfactants, catalysts, aluminum silicate fibers and ceramics. At present, the method of producing aluminum sol is mainly to put aluminum chips into hydrochloric acid, provide the aluminum source in the aluminum sol, and stir for 18-24 hours at 70°C-125°C. This preparation method has a long preparation period and low aluminum-chlorine ratio. (0.8-1.3) Strong corrosion, PH value of 2-3, and violent reaction, the reaction speed is not easy to control, and a large amount of hydrogen gas is released, which is not easy to control, so it cannot be produced in thunderstorm w...

AI Technical Summary

Problems solved by technology

During use, strong corrosive HCl gas is released when heated, which greatly limits its scope of application

[0003] Wei Xiang and others introduced in detail that the aqueous solution of polyaluminum chloride is in full contact with metal aluminum to make an aluminum sol with an aluminum content of 5-13w% and an aluminum-chlorine ratio of 0.6-2. This method does not use hydrochloric acid and is less corrosive. The operation is safe, and its disadvantage is that the content of impurity iron ions in polyaluminum chloride is high, which affects the activity of the catalyst, and even makes the catalyst inactive. The aluminum content in the reaction is excessive, and the excess aluminum scrap is removed by filtration, which increases the complexity of the work.

The method of removing iron ions is cumbersome and difficult to achieve

[0004] The physical and chemical properties of aluminum sol prepared from aluminum chloride are the best, but it is easy to introduce toxic chloride ions; the stability and bonding strength of aluminum sol prepared from alumina powder and aluminum hydroxide are small, which cannot meet the requirements of metals. The preparation requirements of the carrier catalyst coating; the preparation of aluminum sol from pseudo-boehmite is easy to obtain and low in price, but the prepared aluminum sol has poor stability and will appear stratified after a period of time