Lime sintering treatment method and clinker prepared by the method
A treatment method, lime sintering technology, applied in the direction of alumina/aluminum hydroxide, etc., can solve the problems of large amount of leached slag and large amount of lime added, achieve good economic and social benefits, improve leaching performance, and low cost Effect
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Embodiment 1
[0019] 100kg of low-grade bauxite is crushed and ground, and the chemical composition of the low-grade bauxite in terms of mass percentage is: Al 2 o 3 55.5%, SiO 2 20.8%, Fe 2 o 3 7.5%, and the rest are impurities; after grinding, the particles with a particle size less than 0.074mm account for more than 85%; then add limestone according to the calcium ratio C / A=1.4, the amount of limestone added is 170kg, and the chemical composition of limestone expressed in mass percentage It is: CaO50.9%, MgO2.6%, and the rest are impurities; the amount of calcium sulfate added is 4% of the total mass of bauxite and limestone; the materials are mixed and heated from room temperature to simulate the sintering process of the rotary kiln. Raise the sintering temperature to 1000°C at a heating rate of 10°C / min, and then raise the temperature to 1400°C at a heating rate of 20°C / min, keep it at this temperature for 30 minutes, and then cool naturally in the furnace; the obtained clinker Due...
Embodiment 2
[0024]100kg of low-grade bauxite is crushed and ground, and the chemical composition of the low-grade bauxite in terms of mass percentage is: Al 2 o 3 50.3%, SiO 2 14.7%, Fe 2 o 3 10.2%, the rest are impurities; after grinding, the particles with a particle size less than 0.074mm account for more than 85%; then add limestone according to the calcium ratio C / A=1.2, the amount of limestone added is 117kg, and the chemical composition of limestone expressed in mass percentage It is: CaO57.8%, MgO3.9%, and the rest are impurities; the amount of calcium sulfate added is 10% of the total mass of bauxite and limestone; the materials are mixed and heated from room temperature, first at 10 °C / min The heating rate raises the sintering temperature to 1000°C, then raises the temperature to 1400°C at a rate of 20°C / min, and keeps it at this temperature for 15 minutes, and then cools naturally in the furnace; 2 The existence of clinker, the clinker will be self-pulverized, and the parti...
Embodiment 3
[0029] 100kg of low-grade bauxite is crushed and ground, and the low-grade bauxite is composed of the following components with corresponding mass fractions: Al 2 o 3 41.8%, SiO 2 19.2%, Fe 2 o 3 14.7%, and the rest are impurities; after grinding, the particles with a particle size less than 0.074mm account for more than 85%; then add limestone according to the calcium ratio C / A=1.4, the amount of limestone added is 185kg, and the chemical composition of limestone is calculated by mass percentage It is: CaO42.3%, MgO0.6%, and the rest are impurities; the amount of calcium sulfate added is 4% of the total mass of bauxite and limestone; the materials are mixed and sintered, and the temperature is kept at 1375 ° C for 60 minutes during sintering , and then naturally cooled in the furnace; the obtained clinker has γ-2CaO·SiO 2 The clinker is self-pulverized, and the particles with a particle size of less than 0.074mm in the clinker can reach more than 90%; the clinker contains...
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