SU1196334A1 - Method of producing alumomagnesium spinel - Google Patents

Abstract

A METHOD FOR OBTAINING AN ALSHOMAGNEVIC SPININE, including mixing magnesium and alcmini compounds, mechanical action on the resulting mixture and burning it, characterized in that, in order to reduce energy costs, mechanical action is carried out by shock loads at 1-10 GPa.

Description

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The invention relates to the field of non-ferrous metallurgy and can be used in the production of aluminum-magnesium spinel.

The purpose of the invention is to reduce energy consumption.

Example 1. A sample of 1075.3 g and 431.0 g of MgO is taken, mixed and subjected to shock loads of U GPA IB to a planetary mill for 40 minutes. The mixture of oxides is then calcined for 1.5 hours. The product is treated with a solution for 1 hour. After draining the acid, the powder is washed and dried. According to chemical and X-ray analysis, the final product is a single phase - aluminum-magnesium spinel.

Example 2. A weighed portion of 400 g of A1 (OH) and 2655 g of Mg (OH), j-3MC03 was taken, mixed and subjected to shock mechanical loads of 1 GPa in a Gart-type sonar device for 60 minutes. ” Then the mixture obtained is burned at 1270 ° C for 1.0 hour. The product is treated with a solution of HC1 for 1 hour. After draining the acid, remove the nofjo shock and dry. According to the chemical and 1) X-ray diffraction analyzes, the final product is a single phase, an alumomagnesium spinel,

According to this method, when loading 1-10 GPa, mechanical energy, referred to an atom, is commensurate with chemical energy. In this case, mechanical loads allow the destruction of chemical bonds. To reduce energy consumption, the corresponding loads should be short-term, i.e. wear shock character.

The value of mechanical loads must be at least 1 GPa in order to achieve the desired effect of reducing energy consumption. For example, when processing the initial mixture by mechanical loading of 0.1 GPa, the spinel synthesis is completed at 1300 within only 5 hours. It is also impractical to achieve mechanical load values of more than 10 GPa, since with their further increase the effect of reducing energy consumption ceases to increase to a noticeable degree.

The treated mixture of magnesium and aluminum compounds is calcined — from 1.200–1270 ° C for l, 0–1.5 h. The temperature and calcination time should be at least 1.0 h and 1200 C,

since at lower values, the spinel-forming reaction does not complete. Temperature And time should also not exceed 1.5 hours and 1270 ° C, because at these values

The formation of cells is completed and a further increase in time and temperature leads only to unnecessary energy consumption.

The use of the invention makes it possible to obtain aluminum-magnesium spinel at lower temperatures with a shorter calcination time, which contributes to a substantial reduction in energy costs. In addition, the proposed method is carried out using a simpler technology, since there is no briquetting step after pretreatment of a mixture of oxides of magnesium and alcmini, which is a known method in the case of using dry grinding of the starting oxides.

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Claims (1)

METHOD FOR PRODUCING ALUMINUM-MAGNESIUM SPINEL, including the mixing of magnesium and aluminum compounds, the mechanical effect on the resulting mixture and its burning, characterized in that, in order to reduce energy consumption, the mechanical effect is carried out by impact loads at 1-10 ² GPa.