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Method for preparing magnesium aluminate spinel by using secondary aluminum ash

A technology of magnesium aluminum spinel and secondary aluminum, which is applied in the direction of ammonium chloride and ammonium halide, can solve the problems of high product impurities and poor performance, and achieve high alumina content, low impurity content and fast reaction speed Effect

Active Publication Date: 2018-09-28
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Aiming at the problems in the existing process of preparing magnesia-aluminum spinel with aluminum ash as raw material without pretreatment, adding additives, many impurities in the product, and poor performance, the present invention proposes a method for preparing magnesia-aluminum spinel using secondary aluminum ash The spar method uses secondary aluminum ash as raw material, and after denitrification pretreatment, prepares high-quality magnesia-alumina spinel with magnesium oxide materials, realizes comprehensive utilization of aluminum ash, reduces environmental pollution, and obtains high-quality, economical Good magnesia alumina spinel products

Method used

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  • Method for preparing magnesium aluminate spinel by using secondary aluminum ash
  • Method for preparing magnesium aluminate spinel by using secondary aluminum ash

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Embodiment 1

[0034] Process such as figure 1 shown;

[0035] Prepare secondary aluminum ash as a raw material; said secondary aluminum ash is the secondary aluminum ash formed after the aluminum ash utilizes the melting and casting process to extract aluminum, and the main components contain Al 6% by mass percentage, Al 2 o 3 59.5%, AlN 26%, MgO 6%, impurities 3.5%;

[0036] Calcinate the secondary aluminum ash at 1000°C for 2 hours, cool to room temperature and then ball mill until the particle size is ≤106 μm to make secondary aluminum ash fine powder;

[0037] Add the secondary aluminum ash fine powder into water, the solid-to-liquid ratio of the secondary aluminum ash fine powder to water is 100g / L; then, at a temperature of 90°C and stirring, apply ultrasonic waves for water immersion to make the secondary aluminum ash The aluminum nitride in the fine powder material undergoes a hydrolysis reaction; the alkaline gas ammonia gas generated during the water immersion process is disch...

Embodiment 2

[0043] Method is with embodiment 1, and difference is:

[0044] (1) Secondary aluminum ash, the main component contains Al 10% by mass percentage, Al 2 o 3 60%, AlN 22%, MgO 6%, impurity 2%;

[0045] (2) During water immersion, the stirring speed is 800r / min, and the ultrasonic frequency is 100kHz; after the leaching residue is washed and dried, it is mixed and ground with magnesium oxide (particle size ≤ 106 μm) made by calcining magnesium hydroxide;

[0046] (3) The temperature of high-temperature sintering is 1700° C., and the time is 4 hours;

[0047] Magnesium aluminum spinel contains Al by mass percentage 2 o 3 70.3%, MgO 27.9%, bulk density 3.29g / cm 3 .

Embodiment 3

[0049] Method is with embodiment 1, and difference is:

[0050] (1) Secondary aluminum ash, the main component contains Al by mass percentage 2 o 3 55%, AlN 12%, MgO 20%, impurities 3%;

[0051] (2) The pellets are smelted in an electric arc furnace (at a temperature exceeding 1700° C.) to produce magnesia-aluminum spinel; the time for smelting in the electric arc furnace is 2 hours;

[0052] Magnesium aluminum spinel contains Al by mass percentage 2 o 3 71.5%, MgO 27.1%, bulk density 3.42g / cm 3 .

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Abstract

The invention discloses a method for preparing magnesium aluminate spinel by using secondary aluminum ash. The method comprises the following steps: (1) preparing the secondary aluminum ash as a raw material; (2) calcining for 1-3 h in 900-1200 DEG C, after cooling, ball-milling and preparing secondary aluminum ash fine powder; (3) adding the secondary aluminum ash fine powder to water, under theconditions of a temperature of 50-98 DEG C and stirring, and performing water leaching by applying an ultrasonic wave; feeding an ammonia gas generated by the water leaching to a reaction tank and generating ammonium chloride with hydrochloric acid; (4) filtering and separating a leaching residue, after washing and drying, mixing with a material containing magnesium oxide, and levigating; (5) pressing as pellets; and (6) sintering the pellets in a high temperature or smelting in an electric arc furnace so as to prepare the magnesium aluminate spinel. The method is rapid in reaction speed, andcapable of enabling nitrogen to be converted to the ammonia gas which is discharged and recycled, enabling soluble impurities to enter a liquid phase, and realizing the further impurity removal. The prepared magnesium aluminate spinel is high in purity, and less in impurity content.

Description

technical field [0001] The invention belongs to the technical field of materials and environmental protection, and in particular relates to a method for preparing magnesium-aluminum spinel by using secondary aluminum ash. Background technique [0002] Aluminum ash is a general term for the products obtained after cooling the slag produced in the production process of electrolytic aluminum, cast aluminum and recycled aluminum. Its main sources are: (1) Anode replacement, aluminum tapping, electrolytic tank overhaul, etc. Generally, 1 ton of electrolytic aluminum produces 30-50 kg of aluminum ash; (2) In the process of aluminum casting, ingot casting, remelting, forging, cutting and other processes, an average of 30-40 kg of aluminum is produced from processing to application per 1 ton of aluminum Aluminum ash; (3) In the production process of recycled aluminum, the recovery rate of waste aluminum recycling and reprocessed products is about 75-85%, that is, 1 ton of waste alum...

Claims

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Application Information

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IPC IPC(8): C04B35/443C04B35/622C01C1/16
CPCC01C1/164C04B35/443C04B35/62204C04B2235/77
Inventor 狄跃忠彭建平崔智春王耀武冯乃祥
Owner NORTHEASTERN UNIV
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