Low-alkali expansive moderate heat silicate cement and production method thereof
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A Portland cement, micro-expansion technology, applied in the field of cement, can solve the problem of no stricter requirements for alkali content, and achieve the effect of improving performance, high strength and high compressive strength
Active Publication Date: 2011-11-23
SICHUAN ESHENG CEMENT GROUP
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[0005] Although the above method provides a method for making medium-heat Portland cemen
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[0028] The preparation method of the above-mentioned alkali micro-expansion medium-heat Portland cement is specifically:
[0029] Raw material ratio weight composition is: limestone 67-80%, sandstone 8-15%, dolomite 7-13%, aluminum ore waste rock 0.5-5%, copper slag 4-9%; It is required to grind in a raw material mill to make a fineness of 0.08mm, and the sieve residue is not more than 16.0%;
[0030] Send the above-mentioned raw materials into a new dry-process rotary kiln for coal-injection calcination, choose washed coal as fuel, the calorific value of washed coal (Qnet, ad) ≥ 5400cal / g, fuel coal ash alkali content ≤ 2.0%, total sulfur ≤ 2.0%;
[0031] The above-mentioned raw material is calcined by coal injection in a new dry method rotary kiln to obtain low-alkali and medium-heat Portland cement clinker, and the Al in the clinker 2 o 3 , Fe 2 o 3 , MgO, R 2 The content of O is controlled to be 3.5-4.5%, 5.0-6.0%, 3.0-5.0%, 0.25-0.50%, respectively, and f-CaO≤0.8%; ...
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[0035] A certain proportion of limestone, high silica sandstone, copper slag, dolomite, aluminum ore waste rock, etc. are used as raw materials for batching. The main chemical components of the raw materials are shown in Table 1. The industrial analysis results and main chemical components of the fuel are shown in Table 2 and Table 2. Table 3. See Table 4 for the raw meal ingredient ratio. See Table 5 for the main chemical components and rate values of the raw meal. The medium-heat Portland cement clinker is calcined using a new dry process rotary kiln. The main chemical components of the clinker are shown in Table 6. The material rate and main mineral composition are shown in Table 7; the obtained clinker and gypsum powder are ground to obtain medium-heat Portland cement, and its main chemical composition control indicators and conventional physical properties are shown in Table 8 and Table 9, respectively. The fuel is washed coal. The washed coal processing plants in Leshan...
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Abstract
The invention discloses low-alkali expansive moderate heat silicate cement and a production method thereof, and belongs to the field of cement. The invention provides the low-alkali expansive moderate heat silicate cement. A calcareous raw material, a clayey raw material, a magnesium raw material, aluminum ore barren rock and copper slag are taken as raw materials, and are subjected to raw material milling, clinker calcination and cement milling to form the low-alkali expansive moderate heat silicate cement. The low-alkali expansive moderate heat silicate cement is prepared by the following raw materials in percentage by weight: 67 to 80 percent of calcareous raw material, 8 to 15 percent of clayey raw material, 7 to 13 percent of magnesium raw material, 0.5 to 5 percent of aluminum ore barren rock and 4 to 9 percent of copper slag. The moderate heat silicate cement has the alkali content of less than or equal to 0.50 percent, the 3-day heat of hydration of less than or equal to 231kJ/kg and the 7-day heat of hydration of less than or equal to 273kJ/kg. The industrial waste slag of copper slag is used as an iron corrective raw material, and the aluminum ore barren rock is used as an aluminum corrective raw material, so that the pollution of solid waste gas on the environment is avoided, the waste is changed into treasure, and the performance of the moderate heat cement is improved.
Description
technical field [0001] The invention relates to cement, in particular to a medium-heat Portland cement produced by utilizing industrial waste residue and tailings. Background technique [0002] At present, for mass concrete projects, especially dam concrete, the internal temperature rises due to hydration heat release. If the internal temperature is too high, the temperature difference between the inside and outside of the concrete may be too large, resulting in a large temperature stress; when the temperature stress is greater than that of the concrete When the tensile strength is high, it will lead to the cracking of mass concrete; therefore, general mass concrete projects, especially hydropower dam projects, usually use medium-heat Portland cement with relatively little hydration heat release as gel material. In the process of application and research, it was found that the autogenous volume deformation of concrete poured with medium-heat Portland cement has a slight shri...
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