Chemical metallurgical method for comprehensive treatment and utilization of red mud
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A technology of chemical metallurgy and comprehensive treatment, applied in chemical instruments and methods, improvement of process efficiency, alumina/aluminum hydroxide, etc., can solve the problems of high energy consumption for dehydration, improve grade and recovery rate, and avoid tailings The effect of blocking and efficient utilization
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The latter consumes a lot of energy for dehydration, and contains high alkali and corrodes refractory materials.
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example 1
[0043] Example 1: Iron concentrate and nano-activated alumina made from red mud in an aluminum plant in Yunnan.
[0044] Element
Al 2 o 3
Fe 2 o 3
SiO 2
CaO
Na 2 o
TiO 2
Loss on ignition
content(%)
18.56
41.33
8.31
2.11
4.13
1.02
12.16
[0045] Second, the main process:
[0046] The red mud is defloated, and the auxiliary materials are crushed and ground. Material blending, agglomeration, reduction transformation, closed cold storage, wet magnetic separation to produce iron concentrate. Aluminum-rich slag is desiliconized by cooking, synthetic reaction, solid-phase drying and roasting to produce nano-active alumina; mother liquor is concentrated and dried to produce ammonium carbonate.
[0071] Primary reduction: red mud: lignite = 1:0.09, red mud: limestone = 1:0.15, secondary reduction: red mud: lignite = 1:0.1
[0072] 3. Reduction and conversion conditions: the first reduction and conversion conditions are the same as Example 1; the second reduction and magnetization of selected parts, magnetic separation conditions: 1000HS for...
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Abstract
The invention relates to a chemical metallurgy method for comprehensive treatment and utilization of red mud. Lignite is used as a reducing agent for Fe2O3 in the red mud, limestone is taken as a dispersant and a conversion agent for Al2O3 in the red mud, and the lignite and the limestone are finely ground and uniformly mixed with the red mud for carrying out reduction magnetization and conversionroasting. Fe3O4 and Fe obtained by the magnetization are subjected to magnetic separation enrichment to obtain an iron concentrate, and second reduction magnetization can be further carried out on the iron concentrate and then precision magnetic separation is performed to prepare reduced iron powder. After the magnetic separation, Al2O3 is converted into Al2(CO3)3 aluminum-rich slag for performing oxidative cooking and desilication to dissolve Al2(CO3)3. Silicon slag containing a small amount of aluminum and calcium can be used as a raw material of ceramic or white cement. An Al2(CO3)3 solution is used for synthesizing NH4Al(OH)2CO3(inverted arrow) with ammonia water. After carrying out solid-liquid separation, solid-phase NH4Al(OH)2CO3 is dried and roasted and reduced to obtain nano-active alumina; liquid-phase (NH4)2CO3 is concentrated and crystallized and then dried to obtain a sodium carbonate by-product.
Description
technical field [0001] The invention belongs to a chemical and metallurgical technology for resourceful comprehensive treatment of smelting slag, in particular to a method for comprehensive treatment and utilization of huge amount of polluting waste residue red mud produced in the aluminum industry. Background technique [0002] The treatment and utilization of red mud is a difficult problem in today's mining and metallurgy industry. Red mud, also known as red mud, is an industrial solid waste discharged after refining alumina from bauxite. Generally, it contains a large amount of iron oxide, and its appearance is similar to red soil, so it is named (there are also brown or even off-white that contain less iron oxide). per ton of alumina produced. Incidentally produce 0.5 to 2.5 tons of red mud. The red mud produced in the world is about 70 million tons every year. my country produces more than 30 million tons of red mud every year. The huge amount of red mud produces i...
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