Method of manufacturing refractory material by innocent treatment of secondary aluminum ash
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A technology for harmless treatment and refractory materials, which is applied in the field of manufacturing refractory materials and can solve problems such as polluting groundwater
Inactive Publication Date: 2020-05-19
BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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If the aluminum ash is directly land...
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no. 1 example
[0124] In this example, the object of process treatment is the secondary aluminum ash produced by the metal aluminum melting and casting process, and the secondary aluminum ash includes the following components by mass percentage: 4% Al, 42% Al 2 o 3 , 30% AlN, 7% MgO, 10% fluoride salt, and the rest are impurities. The main impurity is Na 2 O, K 2 O, Fe 2 o 3 , SiO 2 .
[0125] 1. The secondary aluminum ash is ball milled until 80% of the particle size passes through a 74μm sieve;
[0126] 2. The secondary aluminum ash enters the middle chamber of the kiln head through the bucket elevator, and blows the secondary aluminum ash into the rotary kiln through the Roots blower below the kiln head chamber. The secondary aluminum ash is calcined at an oxygen content of 14-18% and a temperature of 1150°C for 2 hours, and cooled to normal temperature by a cooler; the main component of the obtained calcined oxide is Al by mass percentage 2 o 3 88.3%, MgO 7.8%, SiO 2 1.6%, TiO ...
no. 2 example
[0136] Manufacturing method is the same as embodiment 1, and difference is:
[0137] 1. In this example, the secondary aluminum ash as the object of process treatment includes the following components by mass percentage: 5% Al, 44% Al 2 o 3 , 30% AlN, 3% MgO, 8% fluoride, 3.5% K 2 O, the rest is Na 2 O, Fe 2 o 3 , SiO 2 , CaO, TiO 2 and other impurities.
[0138] 2. The main composition of the oxide after calcination is Al by mass percentage 2 o 3 92.7%, MgO 3.5%, SiO 2 1.4%, TiO 2 0.47%, K 2 O 0.19%, CaO 0.17%, Na2O 0.19%, TFe 0.62%, fluoride <0.1%, and other trace impurities.
[0139] 3. Add the above-mentioned calcined oxide to coke with a mass percentage of 3%, the C of the coke is ≥ 95%, and the particle size is less than 10mm;
[0140] 4. Put the above-mentioned calcined oxides into the electric arc furnace for melting and reduction layer by layer. When the charge is basically melted, control the temperature at 2050-2150°C and refine for 0.5 hours, then p...
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Abstract
The invention discloses a method for manufacturing a refractory material by innocent treatment of secondary aluminum ash, and belongs to the field of aluminum industry. The method comprises the following steps: further grinding the secondary aluminum ash until 80% of the secondary aluminum ash passes through a screen with the pore diameter of 74 microns; and calcining the secondary aluminum ash for 0.5-4 hours at the temperature of 1150-1550 DEG C in an oxidizing atmosphere with the oxygen content of 12%-18% to convert metal aluminum, aluminum nitride and aluminum carbide in the secondary aluminum ash into aluminum oxide and volatilize the fluoride salt and chloride salt in the secondary aluminum ash, thereby producing a calcined oxide; cooling the waste flue gas containing fluoride salt and chlorate produced in the calcining process for recovery, and denitrifying and discharging the flue gas. The calcined oxide is independently prepared or mixed with an additive, and the aluminum-magnesium refractory material is prepared after electric arc melting. The preparation method can be used for preparing the refractory material with high purity.
Description
technical field [0001] The application relates to the field of aluminum industry, in particular, relates to a method for manufacturing refractory materials by harmlessly treating secondary aluminum ash. Background technique [0002] Aluminum ash mainly comes from the production process of electrolytic aluminum and aluminum alloy, and is a large amount of solid waste produced in the aluminum industry. The composition of aluminum ash varies slightly due to different raw materials and process conditions of various manufacturers, but usually contains metal aluminum, aluminum oxides, nitrides and carbides, fluoride salts, chlorides, silicon dioxide, magnesium oxide and other metal oxides. [0003] From the above composition of aluminum ash, it can be seen that its components contain a large amount of economically valuable substances, such as alumina, magnesium aluminum spinel, metallic aluminum and aluminum nitride. Therefore, aluminum ash is a renewable resource. However, it ...
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