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Silicate cement for manufacturing advanced silica refractory and manufacturing technique thereof

A technology of Portland cement and refractory materials, which is applied in the field of Portland cement and can solve the problems of poor dispersion and poor gelling properties at room temperature

Active Publication Date: 2008-07-16
RUITAI MATERIALS TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, Ca(OH) 2 The dispersibility and normal temperature gelling properties are very poor

Method used

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  • Silicate cement for manufacturing advanced silica refractory and manufacturing technique thereof
  • Silicate cement for manufacturing advanced silica refractory and manufacturing technique thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] With 159.2 parts of heavy calcium carbonate, 32.1 parts of high-purity quartz powder, and 3.7 parts of ferric oxide as raw materials, 1.5 parts of calcium fluoride and 0.7 parts of calcium sulfate are added, and the sieve residue of 0.088mm is made by compounding, mixing and grinding Less than 10% raw meal. The design mineral composition of the raw meal is: C 3 S=87%, C 2 S=8%, C 2 F=5% (excluding mineralizers calcium fluoride and calcium sulfate), then add 5-15% water or 5-15% by weight, 5-10% concentration of polyvinyl alcohol aqueous solution to form a green body, after drying Sintered at 1280°C for 4 hours, crushed to 50 =2-10μm powder.

[0016] After X-ray inspection, the reaction of clinker is quite complete, C 3 S has been generated in large quantities, and the height of f-CaO characteristic peak 2.40 is very small, see attached figure 1 .

Embodiment 2

[0018] Using 157.6 parts of heavy calcium carbonate, 31.6 parts of high-purity quartz powder, 5.1 parts of ferric oxide, 1.9 parts of calcium fluoride, 2.5 parts of calcium sulfate, and 2.5 parts of magnesium sulfate as raw materials, it is prepared by compounding, mixing and grinding to 0.088 mm sieve less than 10% raw meal. The design mineral composition of the raw meal is: C 3 S=87%, C 2 S=9%, C 2 F=7% (excluding mineralizer calcium fluoride and calcium sulfate). Next, add 5-15% of water or 5-15% by weight and 5-10% concentration of polyvinyl alcohol solution to form a green body, dry it and burn it at 1280°C for 4 hours, and crush it to 50 =3.04μm, estimated specific surface area 10022.09cm 2 / g square centimeter / gram of cement. The particle size analysis results of the cement are shown in the attached figure 2 .

[0019] When utilizing cement described in the present invention to prepare refractory castables, adopt 32% 3.2-1.5mm silica, 37% 1.5-0.15mm silica, 21% 3...

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Abstract

The invention relates to silicate cement for producing advanced silicon refractory material; the cement mainly comprises tricalcium silicate, dicalcium silicate and dicalcium ferrite without Al2O3, and C3S is of high content and great fineness; theoretical mineral composition of the cement is 95 to 80 percent of C3S, 2 to 14 percent of C2S and 3 to 10 percent of C2F, as well as 1 to 2 percent of fluorite, 0 to 6 percent of calcium sulfate and 0 to 4 percent of magnesium sulfate or magnesium oxide which are added as mineralizer. The production process of the cement is that a raw material of 0.088 sieve residue less than 10 percent is designed according to the composition and prepared after mixing and grinding; then the raw material is blanked, dried and then sintered for 1 to 6 hours at 1260 to 1350 DEG C; then, the cement with median particle size D50 is equal to 2 to 10Mum is prepared by an ultrafine powder grinding device. The invention is characterized by rapid hardness, high strength, favorable adaptability to ultrafine powder and admixture, no impurity Al2O3 and so on, and the invention is suitable for the binder and mineralizer of the advance silicon refractory material.

Description

technical field [0001] The invention relates to a portland cement used for producing siliceous refractory materials. Compared with traditional cement, this cement has aluminum-free, ultra-fine and high C 3 The characteristic of S content is especially suitable for use as binder and mineralizer in the manufacture of high-grade, large-scale sintered siliceous refractories and unshaped siliceous refractories. Background technique [0002] Silicon refractories are widely used in metallurgy, glass and other industries. Because, K 2 O, Na 2 O and Al 2 o 3 Such impurities greatly damage the high-temperature performance, and high-quality silica bricks require a melting index (2R 2 O+Al 2 o 3 )<0.5%. [0003] Generally, cement can be divided into three categories: silicates, aluminates, and sulphoaluminates. Portland cement contains C 3 S, C 2 S, C 3 A and C 4 AF four minerals. This kind of cement contains a lot of Al 2 o 3 , and the hydration is very slow, it tak...

Claims

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Application Information

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IPC IPC(8): C04B7/02C04B35/66
CPCC04B2111/105C04B2111/00206C04B2111/00431C04B7/02
Inventor 王杰曾叶亚红王骏涛赵洪亮
Owner RUITAI MATERIALS TECHNOLOGY CO LTD
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