Method for preparing inorganic fireproof plate for building by adopting steel slag tailings and desulfurized gypsum

An inorganic fireproof board, desulfurization gypsum technology, applied in sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of slow hydration speed, low strength, limited excitation effect, etc. Low calorific value and the effect of improving gelling activity

Active Publication Date: 2013-08-28
迁安金隅首钢环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, single gypsum or desulfurized gypsum has a limited stimulating effect on the activity of steel slag, and the material still has a slow hydration rate and low strength. Therefore, it is necessary to study the activation method and the synergistic effect of two or more activators to improve the gelling activity of steel slag.

Method used

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  • Method for preparing inorganic fireproof plate for building by adopting steel slag tailings and desulfurized gypsum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1. Sieve the steel slag tailings (chemical composition shown in Table 1) of Shougang, and select particles with a particle size of 40-100 mesh for fine grinding to achieve a specific surface area of ​​3800cm 2 / g. The specific surface area is 2500cm 2 / g desulfurized gypsum is heat-treated at 180°C for 2 hours, and all raw materials are mixed according to the following parts by weight:

[0023] Steel slag tailings 60 parts

[0024] 40 parts of desulfurized gypsum

[0025] Whisker plaster 2 parts

[0026] Water glass 0.1 part

[0027] Quicklime 2 parts

[0028] 2 parts alum

[0029] 2. After mixing and stirring the above raw materials for 30 minutes, add water according to the mass ratio of raw materials and water of 1:0.50, mix and stir for 120 s, pour into the mold for 24 hours, demold and cure for 3 days.

[0030] 3. The compressive strength of the 20×20×20mm block reaches 9.83MPa, and the bulk density is 442 kg / m 3 , to meet the national standard GB8624-2006 ...

Embodiment 2

[0032] 1. Sieve the steel slag tailings (chemical composition shown in Table 1) of Anshan Iron and Steel Co., Ltd., and select particles with a particle size of 40-100 mesh for fine grinding to achieve a specific surface area of ​​3000cm 2 / g, the specific surface area is 2200cm 2 / g desulfurized gypsum is heat-treated at 150°C for 2.5 hours, and all raw materials are mixed according to the following parts by weight:

[0033] Steel slag tailings 55 parts

[0034] 45 parts of desulfurized gypsum

[0035] Whisker plaster 3 parts

[0036] 0.3 parts of water glass

[0037] 3 parts quicklime

[0038] 3 parts alum

[0039] 2. After mixing and stirring the above raw materials for 20 minutes, according to the mass ratio of raw materials and water of 1:0.70, add water, mix and stir for 60 s, pour into the mold for 24 hours, demold and cure for 3 days.

[0040] 3. The compressive strength of the 20×20×20mm block reaches 9.33MPa, and the bulk density is 421 kg / m3 , meet the nationa...

Embodiment 3

[0042] 1. Sieve the steel slag tailings (chemical composition shown in Table 1) of Angang Steel, and select particles with a particle size of 40-100 mesh for fine grinding to achieve a specific surface area of ​​3600cm 2 / g, the specific surface area is 2800cm 2 / g desulfurized gypsum is heat-treated at 210°C for 1.8h, and all raw materials are mixed according to the following parts by weight:

[0043] Steel slag tailings 50 parts

[0044] Desulfurization gypsum 50 parts

[0045] Whisker plaster 4 parts

[0046] Water glass 0.2 parts

[0047] Quicklime 4 parts

[0048] 4 parts alum

[0049] 2. After mixing and stirring the above raw materials for 35 minutes, add water according to the mass ratio of raw materials and water of 1:0.60, mix and stir for 100 s, pour into the mold for 24 hours, demold and cure for 3 days.

[0050] 3. The compressive strength of the 20×20×20mm block reaches 9.44MPa, and the bulk density is 410 kg / m 3 , meet the national standard GB8624-2006 A1...

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Abstract

The invention relates to a method for preparing an inorganic fireproof plate for a building by adopting steel slag tailings and desulfurized gypsum as main raw materials, belonging to the technical field of comprehensive utilization of solid waste. Raw materials including 40 to 60 parts of the steel slag tailings, 40 to 60 parts of the desulfurized gypsum and 4 to 15 parts of an additive by weight are mixed; steel slag tailing particles with the particle size of between 40 and 100 meshes are selected and subjected to fine grinding until the specific surface area is of between 3,000 and 4,500 cm<2> / g; the specific surface area of the desulfurized gypsum is of between 2,000 and 3,500 cm<2> / g; and semi-dehydrated desulfurized gypsum is prepared by performing thermal treatment on the desulfurized gypsum. The additive is prepared by mixing the following components in parts by weight: 1 to 5 parts of crystal whisker gypsum, 0.1 to 0.3 part of water glass, 1 to 5 parts of calcined lime and 1to 5 parts of white alum. According to the method, the cementitious activity of the steel slag tailings is excited remarkably, and the mechanical property of the material is enhanced; the compressivestrength of a block body 20*20*20 mm is up to 8 to 12 Mpa; the volume-weight is controlled between 360 and 450 kg / m<3>; the requirement of the national standard GB8624-2006 on the A1-level homogeneous incombustible material is met; and a novel way which is high in consumption, low in manufacturing cost and high in efficiency is supplied to application of steel slag tailings and desulfurized gypsum solid waste.

Description

technical field [0001] The invention relates to a method for preparing a fireproof board by using solid waste, in particular to a method for producing an inorganic fireproof board for building with steel slag tailings and desulfurized gypsum as main raw materials, and belongs to the technical field of comprehensive utilization of solid waste. Background technique [0002] The fireproof board is a board made of silicon material or calcium material as the main raw material, mixed with a certain proportion of fiber material, lightweight aggregate, adhesive and chemical additives, and made by autoclaving technology. At present, it is mainly used in some large public buildings with high density of people and high requirements on fire performance, such as conference centers, exhibition halls, gymnasiums, theaters, etc. As countries around the world pay more and more attention to building fire prevention, the materials, varieties and specifications of fireproof boards are becoming ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/14C04B18/14
CPCY02W30/91
Inventor 连芳文天阳杨淇张作顺
Owner 迁安金隅首钢环保科技有限公司
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