Preparation method for Portland cement with iron tailings
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A technology of Portland cement and iron tailings, which is applied in the field of building materials to achieve the effect of improving utilization rate and significant economic and social benefits
Active Publication Date: 2014-11-19
北海诚钢矿业股份有限公司
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Therefore, if iron tailings can be used as raw materials for the production of cement clinker, it can not only reduce production costs and energy consumption, improve economic benefits, but also effectively alleviate the pressure on resources and the environment, but there is no relevant report so far
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Embodiment 1
[0024] The preparation method of the iron tailings Portland cement provided in this embodiment is as follows: (1) Weigh 65 g of calcium oxide, 17 g of silicon oxide, 10 g of iron tailings, 4 g of alumina and 2 g of ferric oxide, and mix them evenly Afterwards, the raw materials are put into a vibrating mill for grinding for 2 minutes, and the remaining amount of the finely ground material through a 200-mesh sieve is not more than 8%, and the mixed raw meal is prepared after fine grinding.
[0025] The iron tailings are waste slag after magnetic separation in the concentrator. The chemical composition and the mass percentage of each composition are as follows: CaO10-20%, SiO 2 25~70%, Al 2 O 3 3~10%, TFe 2 O 3 10-25%, MgO 2 O+K 2 O 2 O 5 <2%, S <3%.
[0026] (2) The finely ground raw materials are calcined in a high temperature furnace for 30 to 90 minutes and then discharged out of the kiln. The calcined raw materials are quenched in the air and artificially assisted to accelerate t...
Embodiment 2
[0038] The preparation method of the iron tailings Portland cement provided in this example is as follows: (1) Weigh 62g calcium oxide, 14g silica, 19g iron tailings, and 5g alumina, mix them evenly, put the raw materials into vibration Grinding is carried out for 4 minutes in the mill, the remainder of the finely ground material passing through a 200-mesh sieve does not exceed 8%, and the mixed raw meal is prepared after fine grinding.
[0039] The iron tailings are waste slag after magnetic separation in the concentrator. The chemical composition and mass percentage of each composition are as follows: CaO10-20%, SiO 2 25~70%, Al 2 O 3 3~10%, TFe 2 O 3 10-25%, MgO 2 O+K 2 O 2 O 5 <2%, S <3%.
[0040] (2) The finely ground raw materials are calcined in a high temperature furnace for 30 to 90 minutes and then discharged out of the kiln. The calcined raw materials are quenched in the air and artificially assisted to accelerate the cooling. The calcining temperature is 1350°C to 1450°C...
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Abstract
The invention provides a preparation method for Portland cement with iron tailings. The Portland cement comprises at least the following raw materials in percentage by weight: 60-70% of calcium oxide, 12-20% of silicon oxide, 5-20% of the iron tailings and 3-6% of aluminium oxide. The preparation method comprises the following steps: weighing the raw materials according to the mass ratio, and mixing uniformly and fine grinding the weighed raw materials; calcining the fine grinded raw materials in a high-temperature furnace, and drawing out and quenching the calcined raw materials to obtain clinkers; adding the iron tailings to the clinkers, mixing uniformly mixtures of the iron tailings and the clinkers, and fine grinding the mixtures to obtain the Portland cement with the iron tailings, wherein the mass of the added iron tailings is 1-8% of the total mass of the clinkers. The method provided by the invention can effectively use the iron tailings as raw materials for production to prepare the Portland cement with excellent quality, so that the deficiencies in the prior art can be overcome, the use of the iron tailings can be maximized, and the purposes of saving resources, reducing the production cost, protecting environment and the like can be realized.
Description
Technical field [0001] The invention provides a method for preparing Portland cement, in particular to a method for preparing Portland cement added with iron tailings, and belongs to the technical field of building materials. Background technique [0002] The raw materials for traditional cement clinker production mainly include lime-based raw materials, clay-based raw materials, correction materials, mineralizers, etc. The cement clinker is ground with gypsum and mixed materials to make cement. The vast majority of cement raw materials are non-renewable resources, and the mass production of cement will inevitably lead to resource depletion. [0003] Iron tailings are wastes discharged by a concentrator after grinding iron ore and selecting useful components. The stockpiling of iron tailings not only takes up a large amount of land resources, but also causes serious environmental pollution. Some old tailings ponds still have safety hazards. Since the main chemical components of i...
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