Method for preparing microcrystal calcium aluminoferrite by using red mud

A technology of calcium ferric aluminate and red mud, applied in cement production and other directions, can solve the problems of small industrial utilization value, complex synthesis process, long production cycle, etc., and achieve fast hydration rate, good chemical stability and low price. Effect

Active Publication Date: 2017-05-31
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The Chinese patent "A Preparation Method for Calcium Aluminoferrite" (201010109398.4) successfully prepared calcium aluminoferrite by sol-gel method, but the synth...

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0026] A method for preparing microcrystalline calcium aluminate ferrite from red mud, specifically comprising the following steps: mixing 35.96 parts of calcium hydroxide, 3.71 parts of aluminum oxide, 100 parts of red mud, 1.19 parts of calcium fluoride, and 1.10 parts of boron oxide, and then adding Grind in a roller mill for 1 hour. Put the ground raw meal into an oven (at a temperature of 70°C) and dry it for 12 hours. The dried raw meal is placed in a platinum crucible and heated in a high-temperature furnace until it melts (the heating and holding process is: room temperature-950°C , heating time 45min; 950°C, holding time 15min; 950-1300°C, heating time 35min; 1300-1420°C, heating time 20min; Pour the clinker into water for quenching, and after the clinker is fully cooled, put it into an oven (at a temperature of 50°C) and dry it for 12 hours; use a drum mill to grind the clinker, and control the average particle size to 30-50 μm, that is, micro Crystalline calcium al...

Embodiment 2

[0028] A method for preparing microcrystalline calcium aluminate ferrite from red mud, specifically comprising the following steps: mixing 20.86 parts of calcium oxide, 3.75 parts of aluminum oxide powder, 100 parts of red mud, and 2.22 parts of calcium fluoride, and then adding them to a drum-type ball mill for grinding 1.5 hours. Put the ground raw meal into an oven (at a temperature of 70°C) and dry it for 12 hours. The dried raw meal is placed in a platinum crucible and heated in a high-temperature furnace until it melts (the heating and holding process is: room temperature-950°C , heating time 45min; 950°C, holding time 5min; 950-1300°C, heating time 35min; 1300-1420°C, heating time 20min; Pour the clinker into water for quenching, and after the clinker is fully cooled, put it into an oven (at a temperature of 50°C) and dry it for 12 hours; use a drum mill to grind the clinker, and control the average particle size to 30-50 μm, that is, micro Crystalline calcium aluminat...

Embodiment 3

[0030] A method for preparing microcrystalline calcium aluminate ferrite from red mud, specifically comprising the following steps: mixing 52 parts of calcium carbonate, 6.44 parts of high-alumina bauxite, 100 parts of red mud, and 2.78 parts of calcium fluoride into a roller ball mill Grind for 1 hour. Put the ground raw meal into an oven (at a temperature of 70°C) and dry it for 12 hours. The dried raw meal is placed in a platinum crucible and heated in a high-temperature furnace until it melts (the heating and holding process is: room temperature-950°C , heating time 45min; 950°C, holding time 20min; 950-1300°C, heating time 35min; 1300-1420°C, heating time 20min; Pour the clinker into liquid nitrogen for quenching. After the clinker is fully cooled, put it in an oven (at a temperature of 50°C) and dry it for 12 hours; use a drum mill to grind the clinker, and control the average particle size to 30-50 μm, that is, A microcrystalline calcium aluminate ferrite powder is obt...

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Abstract

The invention discloses a method for preparing microcrystal calcium aluminoferrite by using red mud. The method comprises the following steps: mixing 20-55 parts by weight of a calcium raw material, 3-15 parts by weight of an aluminum raw material, 100 parts by weight of red mud and 2-3 parts by weight of a fluxing agent, then preparing the mixture into a raw material, and grinding the raw material to enable the average grain size to be less than or equal to 8 microns; drying the ground raw material to remove free water in the raw material; containing the raw material with a platinum crucible, and placing the crucible in a high temperature furnace for heating until the raw material is fused; taking out clinker, and quenching the clinker; and drying the quenched clinker, and grinding the clinker until the average grain size is 30-50 microns, thereby obtaining microcrystal calcium aluminoferrite powder. Combined with high-temperature fusing and quenching processes, the method can utilize the red mud in large quantity and solve the problem of environmental pollution caused by red mud piling, and the method is short in production cycle; and the prepared microcrystal calcium aluminoferrite is high in uniformity, good in chemical stability, strong in hydratability and suitable for large-scale industrial production, and has broad market prospects.

Description

technical field [0001] The invention relates to a method for preparing microcrystalline calcium aluminate ferrite by using industrial waste (red mud), which belongs to high-performance inorganic materials. Background technique [0002] Red mud is a high-alkalinity polluting waste residue discharged during the process of extracting alumina in the aluminum industry. Generally, for every ton of alumina produced on average, about 1-2 tons of red mud are incidentally produced. As the fourth largest producer of alumina in the world, China discharges more than 30 million tons of red mud every year, and the accumulated stockpile has exceeded 250 million tons. With the gradual reduction of the grade of bauxite raw materials and the increase of alumina production year by year, the annual production of red mud in my country will continue to increase. At present, the comprehensive utilization rate of red mud in my country is only 4%, and a large amount of red mud cannot be fully and ef...

Claims

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Application Information

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IPC IPC(8): C04B7/32C04B7/14C04B7/36C04B7/44C04B7/43
CPCC04B7/14C04B7/32C04B7/36C04B7/43C04B7/44Y02P40/10
Inventor 程小伟杨永胜张春梅刘开强郭小阳吴青梅李早元刘健张兴国
Owner SOUTHWEST PETROLEUM UNIV
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