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Cement and methods of preparing cement

A technology of cement composition and compound, which is applied in cement production, thin material processing, transportation and packaging, etc., and can solve problems such as carbon dioxide emissions

Inactive Publication Date: 2010-06-09
NANODYNAMICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Additionally, rotary kilns may only operate at 34% energy efficiency
Another disadvantage of current cement manufacturing methods is the emission of carbon dioxide emissions

Method used

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  • Cement and methods of preparing cement
  • Cement and methods of preparing cement
  • Cement and methods of preparing cement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Calcium carbonate (365 g) was dissolved in nitric acid (677 g). Aluminum nitrate (123 g), ferric nitrate (44 g) and urea (1080 g) were added to the solution and heated until dissolved. Silica fume (134 g) was then added to the solution, and finally 17 g each of citric and acetic acids were added. The solution was heated until all the water was evaporated, and the obtained slurry was transferred into a drying oven heated to 500°C. The solution was foamed and burned to obtain a yield of 320 g of loosely agglomerated product. The product was ground and the composition was determined by XRD analysis. The oxide products include such as image 3 CS, C shown 2 S, C 3 S, CaO, C 4 AF and C 3 a. SEM can also complete the determination of particle size. like Figure 4 As shown, the main particle size of the nanoscale cement is about 200-500 nm. Figure 5 A SEM of Ordinary Portland Cement is shown and it can be seen that the average particle size is greater than about 5 ...

Embodiment 2

[0052] The oxide composition of Example 1 was mixed with 5% gypsum and ball milled to break up agglomerates so that it passed through a 200 mesh screen. It was then mixed with various amounts of sand, silica fume, water and ordinary Portland cement to determine the effect of the different compositions on the compressive strength per ASTM C109.

[0053] In order to record and compare the setting times of the produced compositions comprising said at least one oxide with those of standard or Ordinary Portland Cement (OPC), according to ASTM C-191 "Test of Hydraulic Cement by Vicat Needle The procedure outlined in "Test Method for Clotting Time" was carried out. The procedure involves mixing 200 grams of cement or blended cement with 95 grams of water; placing the slurry in a suitable support or container; and recording the time from adding the water until the Vicat needles cannot visibly sink into the slurry. For each experimental test, a standard sample of OPC was prepared for ...

Embodiment 3

[0058] In this example, a single compound C can be produced 3 a. Calcium carbonate (202 g) was dissolved in nitric acid (372 g). Aluminum nitrate (506 g) and urea (546 g) were added to the solution and heated to dissolve. The solution was heated until all the water was evaporated, then 9.7 grams each of citric acid and acetic acid were added, and the resulting slurry was transferred to a drying oven heated to 500°C. The solution was foamed and burned to obtain a yield of 162 grams of loosely agglomerated product. The product was ground and analyzed by XRD. The product mainly includes Figure 7 C shown 3 a.

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Abstract

Cement compositions and methods for making cement compositions are provided. The cement compositions can comprise at least one oxide having a particle size of less than about 600 nm. The methods for making cement may include: providing a mixture of compounds containing the required calcium, silicon, aluminum, and iron to provide at least one of tricalcium silicate, dicalcium silicate, tricalcium aluminate, tetracalcium aluminoferrite, other calcium silicates, aluminates, ferrites, and silicates or combinations thereof; adding a fuel source and an oxidizer to the mixture of compounds; and heating the mixture of compounds, the fuel source, and the oxidizer such that the mixture of compounds, the fuel source, and the oxidizer ignite to form the at least one tricalcium silicate, dicalcium silicate, tricalcium aluminate, and tetracalcium aluminoferrite, or combinations thereof.

Description

[0001] Cross References to Related Applications [0002] This application claims priority and other benefits to US Provisional Application Serial No. 60,891,663, filed February 26, 2007, the disclosure of which is incorporated herein by reference in its entirety. Background technique [0003] Ordinary Portland cement, one of the main binder components of concrete and mortar, is a controlled chemical combination of compounds made from oxides of calcium, silicon, aluminum and iron with small amounts of other materials. These compounds are generally formed using naturally occurring materials. Ordinary Portland cement may have four basic phases: tricalcium silicate ("C 3 S') (Ca 3 SiO 5 ); dicalcium silicate ("C 2 S') (Ca 2 SiO 4 ); tricalcium aluminate ("C 3 A') (Ca 3 Al 2 o 6 ); and tetracalcium aluminoferrite (“C 4 AF") (Ca 4 Al 2 Fe 2 o 10 ). Other cementitious materials can also be used as one of the main binder components of concrete and mortar. [0004] The...

Claims

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Application Information

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IPC IPC(8): C04B7/52
CPCC04B7/527Y10T428/2982Y02P40/10
Inventor J.·理查德·肖尔苏万卡尔·森古普塔理查德·L.·黑尔费里希加里·M.·戈登德巴布拉塔·劳塔瑞
Owner NANODYNAMICS INC