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Method for producing white cement

A technology of white cement, formula, applied in the field of production of building materials

Inactive Publication Date: 2011-09-07
YANTAI UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of limestone raw material substitution in white cement production, and prepare white cement at low temperature by using marine renewable resource shells and kaolin as ingredients

Method used

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Embodiment Construction

[0005] 1. White cement formula composition and weight percentage:

[0006] Mixed material 80-90%

[0007] White cement clinker 10-20%.

[0008] Strength performance indicators:

[0009] Cement mortar strength 3d compressive strength 33MPa, 28d compressive strength 53MPa.

[0010] 2. Mixed material preparation steps:

[0011] Step 1. Powder preparation. The shells are cleaned of sand, impurities, crushed, and ground, and the fineness is controlled by a 0.08mm square hole sieve <10%. Kaolin and natural gypsum are crushed and ground separately, and the fineness is controlled by a 0.08mm square hole sieve <10%.

[0012] Step 2. Calcining at high temperature. Shell powder is calcined at 950°C in a high-temperature furnace, and the holding time is 1h; kaolin powder is calcined at 850°C, and the holding time is 40min; natural gypsum powder is calcined at 750°C, and the holding time is 1h.

[0013] Step 3. Ingredients are mixed. The calcined materials are uniformly mixed accor...

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Abstract

The invention discloses a method for producing white cement at a low temperature from shells instead of limestone. The ingredients of the white cement are as follows (in percentage by weight): 80 to 90 percent of mixed material and 10 to 20 percent of clinker. The preparation method of the mixed material comprises the following steps of: preparing fine powder of shells, kaolin, natural gypsum; and calcining in a high-temperature furnace respectively, and thoroughly mixing them at a ratio of 5: 3: 2. The preparation method of the clinker comprises the following steps of: thoroughly mixing 85% of shell powder and 15% of kaolin powder, calcining at 1350 DEG C, and bleaching in cold water for 1 minute. The invention has the advantages that: the method for preparing white cement from shells has a low calcination temperature, achieves the purpose of waste utilization and saves energy; and the product is healthy and environment-friendly, and the method conforms to the principles of sustainable development in the building material industry and has wide market prospects.

Description

technical field [0001] The invention belongs to the new technology of using waste to produce building materials, and in particular relates to a formula and preparation method of white cement. Background technique [0002] Coastal areas are rich in shellfish resources, and the utilization rate of shellfish is very low. Most of them are treated as garbage or piled up on the seashore, and a small part is used as feed or decorations. Shells belong to light calcium carbonate, with high calcium content and good grindability. Using it as a raw material to replace natural limestone in firing cement and admixtures has broad development prospects. [0003] White cement is widely used in decoration, and ordinary white cement has high firing temperature and high cost. Aiming at the deficiency of the current white cement production process, the invention proposes a new energy-saving white cement production process. Contents of the invention [0004] The purpose of the invention is to...

Claims

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Application Information

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IPC IPC(8): C04B7/38
CPCC04B7/02C04B7/38
Inventor 王波
Owner YANTAI UNIV
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