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Hydraulic cementing material, and preparation device and method thereof

A technology for hydraulic cementation and raw materials, which is applied in the field of hydraulic cementitious materials and preparation devices thereof, and gypsum-based hydraulic cementitious materials, can solve the problems of limited fossil energy, high heat loss and high energy consumption

Active Publication Date: 2020-01-10
BEIJING UNIV OF CHEM TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Existing hydraulic cementitious materials such as cement and gypsum have insufficient toughness, and problems such as wall cracking are prone to occur during use, and their production is carried out by burning combustible materials such as coke, fuel, methane, and garbage, which will generate a large number of greenhouses. Gas (CO 2 etc.), and fossil energy is limited, in order to cope with global warming, it is urgent to develop an environmentally friendly hydraulic cementitious material production process
The main component of the existing hydraulic gelling material, β-hemihydrate gypsum, is obtained by calcining calcium sulfate dihydrate under dry conditions of 120-200°C; the calciner commonly used in industry has high heat loss, and the water content in the gas is large, resulting in The fuel consumption in the calcination process is very high, although the theoretical decomposition of calcium sulfate dihydrate to hemihydrate only needs about 476kJ / kg, the actual energy consumption is even higher than 1250kJ / kg

Method used

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  • Hydraulic cementing material, and preparation device and method thereof
  • Hydraulic cementing material, and preparation device and method thereof
  • Hydraulic cementing material, and preparation device and method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0261] Embodiment 1: prepare hydraulic cementitious material I

[0262] The heat transfer oil (such as Dow Corning Dimethicone PMX-200) in the heat transfer oil storage tank 21 (the storage tank equipped with a drying device is preferred to deal with the moisture that may exist) passes through the upstream solar heat collection system 1 (for example, Trough solar heat collection system) is heated to 235°C by solar energy. The volume of the heat transfer oil storage tank 21 is designed according to the energy consumption of at least 24 hours of continuous production of the gypsum-based hydraulic cementitious material (that is, greater than the average daily output of 2.4 tons) (calculated according to the solar radiation conditions of the installation site and the composition of raw materials).

[0263] The mixed material that fluidized bed reactor 30 fills comprises: (1) about 120kg / h phosphogypsum (the by-product during phosphoric acid industrial production), and described ph...

Embodiment 2

[0275] Embodiment 2: Preparation of hydraulic gelling material II

[0276] Embodiment 2 is different from Embodiment 1: (1) the raw material that fluidized-bed reactor 30 fills in is by the natural gypsum of 120kg / h (containing free water mass fraction is 5%) and 10kg / h through pulverized powdery Quicklime composition; (2) During the entire residence time (20 minutes) of the reaction mixture in the fluidized bed reactor 30, the temperature is maintained at 160°C (±2°C). All the other conditions are the same as in Example 1.

[0277] The hydraulic gelling material II contains the following components (mass fraction): calcium sulfate hemihydrate (CaSO 4 1 / 2H 2 O) 80.7%, anhydrous calcium sulfate (CaSO 4 )7.3%, calcium hydroxide (Ca(OH) 2 ) 12.0%.

[0278] The hydraulic gelling material II has the following properties:

[0279] - Setting time (DIN 1168): initial setting time 75 minutes, final setting time 95 minutes;

[0280] - Yield (DIN 1164): 86 l / 100 kg dry material; ...

Embodiment 3

[0285] Embodiment 3: Preparation of hydraulic gelling material III

[0286] The difference between embodiment 3 and embodiment 2 is: (1) the raw material that the reactor fills is the desulfurization gypsum (flue gas desulfurization product of 130kg / h, and above-mentioned desulfurization gypsum contains the free water of mass fraction 18% and mass fraction 7-8 % unreacted calcium hydroxide); (2) the temperature of the reaction mixture was maintained at 165° C. (± 2° C.) throughout the residence time (40 minutes) of the reactor. All the other conditions are the same as in Example 2.

[0287] The hydraulic gelling material III contains the following components (mass fraction): calcium sulfate hemihydrate (CaSO 4 1 / 2H 2 O) 78.2%, anhydrous calcium sulfate (CaSO 4 )12.1%, calcium hydroxide (Ca(OH) 2 ) 10.0%.

[0288] The hydraulic gelling material III has the following properties:

[0289] - Hardening time (DIN 1168): initial setting time 110 minutes, final setting time 160 ...

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Abstract

The invention belongs to the field of hydraulic cementing material production, and relates to a hydraulic cementing material, and a preparation device and method thereof. The hydraulic cementing material mainly contains gypsum and is added with a small amount of hydrated lime, and can be used as a low-cost and good toughness substitute for the hydraulic cementing material of portland cement. The preparation device of the hydraulic cementing material uses fluidized bed equipment driven by solar energy as a production device, fossil fuel energy needed for production can partly or completely be replaced for energy supply, greenhouse gas emission in the production process is low, and costs of pollution to the environment and treatment of solid waste are reduced.

Description

technical field [0001] The invention belongs to the production field of hydraulic gelling materials, and relates to a hydraulic gelling material and a preparation device and method thereof, in particular to a gypsum-based hydraulic gelling material and a method for preparing the gypsum-based hydraulic gelling material by using solar energy Devices and methods. Background technique [0002] Hydraulic binder (HB) mainly includes cement, gypsum and other types. At present, the output of Portland cement in the world is about 1 billion tons per year, so it can be assumed that the per capita annual consumption is about 170 kg. With the growth of population and the improvement of people's living standards, the per capita annual consumption of Portland cement in developing countries can reach 500 kg, and the total annual output will exceed 2 billion tons. Portland cement is mainly divided into two different application fields, namely the concrete field, which accounts for about 60...

Claims

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Application Information

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IPC IPC(8): C04B11/00C04B11/05C04B11/28C04B11/036
CPCC04B11/00C04B11/002C04B11/0283C04B11/05C04B11/28
Inventor 张会丽杜蒙特·菲利普贝延斯·扬
Owner BEIJING UNIV OF CHEM TECH
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