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A kind of preparation method of Portland cement of iron tailings
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A technology of portland cement and iron tailings, applied in the field of building materials, to achieve the effect of improving utilization rate and significant economic and social benefits
Active Publication Date: 2016-08-31
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 the present embodiment is as follows: (1), weigh 65g of calcium oxide, 17g of silicon oxide, 10g of iron tailings, 4g of alumina, 2g of ferric oxide, and mix well Finally, the raw material is put into a vibrating mill for grinding for 2 minutes, and the balance of the finely ground material passing through a 200-mesh sieve is no more than 8%, and the mixed raw meal is obtained after finely grinding.
[0025] The iron tailings are waste slag after magnetic separation in the concentrator, and its chemical composition and mass percentages of each composition are as follows: CaO 10-20%, SiO 2 25-70%, Al 2 o 3 3~10%, TFe 2 o 3 10~25%, MgO2 O+K 2 O2 o 5 <2%, S<3%.
[0026] (2), calcining the finely ground raw materials in a high-temperature furnace for 30 to 90 minutes and then leaving the kiln, quenching the calcined raw materials in the air, and artificially helping them to accelerate cooling, the...
Embodiment 2
[0038] The preparation method of the iron tailings portland cement provided in the present embodiment is as follows: (1), weigh 62g of calcium oxide, 14g of silicon oxide, 19g of iron tailings, 5g of aluminum oxide, mix and put the raw materials into the vibration Grinding is carried out in the mill for 4 minutes, and the balance of the finely ground material passing through a 200-mesh sieve is no more than 8%, and the mixed raw meal is obtained after finely grinding.
[0039] The iron tailings are waste slag after magnetic separation in the concentrator, and its chemical composition and mass percentages of each composition are as follows: CaO 10-20%, SiO2 25-70%, Al 2 o 3 3~10%, TFe 2 o 3 10~25%, MgO2 O+K 2 O2 o 5 <2%, S<3%.
[0040] (2), calcining the finely ground raw materials in a high-temperature furnace for 30 to 90 minutes and then leaving the kiln, quenching the calcined raw materials in the air, and artificially helping them to accelerate cooling, the calcining ...
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Abstract
The invention provides a method for preparing Portland cement with iron tailings, comprising the following steps: raw materials at least include the following components: calcium oxide, silicon oxide, iron tailings and alumina, and the mass percentage of each component is: Calcium 60-70%, silicon oxide 12-20%, iron tailings 5-20%, aluminum oxide 3-6%, weigh the raw materials according to the above mass ratio, mix them evenly and finely grind them; put the finely ground raw materials at high temperature After calcination in the furnace, it is quenched out of the kiln to obtain clinker; iron tailings are added to the clinker and mixed evenly. The mass of the added iron tailings accounts for 1-8% of the total mass of the clinker, and it is obtained after fine grinding Iron tailings portland cement. This method can effectively use iron tailings as raw materials for production, and prepare high-quality Portland cement, so as to overcome the deficiencies of the existing technology, maximize the utilization of iron tailings, and achieve the goals of saving resources, reducing production costs and protecting the environment. .
Description
technical field [0001] The invention provides a preparation method of Portland cement, in particular relates to a preparation method of Portland cement added with iron tailings, belonging to the technical field of building materials. Background technique [0002] The raw materials for traditional cement clinker production mainly include calcareous raw materials, clay raw materials, correction materials, mineralizers, etc. Cement clinker is mixed 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 the wastes discharged after the ore concentrator grinds iron ore and selects useful components. The stockpiling of iron tailings not only takes up a lot of land resources, but also causes serious environmental pollution. Some old tailings ponds also have potential safety hazards. Since the main chemical composit...
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