Method for preparing gypsum dry-mixed mortar through slag frying gypsum

A technology for dry-mixing mortar and gypsum, which is applied in the field of industrial solid waste recycling and utilization, can solve problems such as energy and resource waste, and achieve the effects of reducing installation costs, reducing equipment investment and simple production process.

Active Publication Date: 2017-04-26
长治市武理工工程技术研究院
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing gypsum dry-mixed mortar with slag-fried gypsum with s

Method used

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  • Method for preparing gypsum dry-mixed mortar through slag frying gypsum
  • Method for preparing gypsum dry-mixed mortar through slag frying gypsum
  • Method for preparing gypsum dry-mixed mortar through slag frying gypsum

Examples

Experimental program
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Example Embodiment

[0028] Example 1:

[0029] Such as figure 1 As shown, this embodiment provides a method for preparing gypsum dry-mixed mortar from slag-fried gypsum, which includes the following steps:

[0030] 1) The hot slag and desulfurized gypsum discharged from the circulating fluidized bed boiler are sent to a slag frying machine for mixing. The slag frying machine adopts a rotary dryer, and the hot slag and desulfurized gypsum are mixed under the rotating heating and stirring of the rotary dryer At the same time, the heat of the hot slag is transferred to the desulfurized gypsum, so that the free water and crystal water of the desulfurized gypsum are separated into water vapor, and the water vapor is discharged together with the hot air, and the desulfurized gypsum is converted into hemihydrate gypsum, so that the heat of the hot slag can be less The desulfurization gypsum can be dried and dehydrated with or without additional heat source, saving a lot of energy input. Among them, in orde...

Example Embodiment

[0036] Example 2:

[0037] On the basis of the preparation method provided in Example 1, the hot slag discharge temperature in this example is 700°C, and the hot slag and desulfurized gypsum are 1:1.3. The desulfurization is prepared by slag frying machine, grinding and sieving. The basic physical properties of building gypsum (ie gypsum powder) are shown in Table 1.

[0038] The desulfurized building gypsum obtained by frying, the slag sand as the fine aggregate, the sand-to-paste ratio is 2.5:1, the dry-mixed gypsum mortar is prepared, the water-paste ratio is controlled to be 0.51:1, the citric acid, cellulose ether, and rubber powder are mixed The amount is 0.4%, 0.15%, 0.5%, and the polycarboxylic acid water reducing agent content is 1.1%. The properties of the prepared gypsum dry-mixed mortar are shown in Table 2.

[0039] Table 1: Physical properties of desulfurized building gypsum

[0040]

[0041] Table 2: Basic physical performance indexes of gypsum dry-mixed mortar

[0042]...

Example Embodiment

[0043] Example 3:

[0044] On the basis of the preparation method provided in Example 1, the hot slag discharge temperature in this example is 600°C, and the hot slag and desulfurized gypsum are 1:1. The desulfurization is prepared by frying the slag frying machine, grinding and sieving The basic physical properties of building gypsum are shown in Table 3.

[0045] The desulfurized building gypsum obtained by frying, the slag sand is used as the fine aggregate, the sand-to-paste ratio is 2:1, the gypsum dry-mixed mortar is prepared, and the water-paste ratio is controlled to 0.49:1. Citric acid, cellulose ether, and rubber powder are mixed The amount is 0.7%, 0.5%, 1.0% respectively, and the blending amount of polycarboxylic acid water reducing agent is 0.8%. The properties of the prepared gypsum dry-mixed mortar are shown in Table 4.

[0046] Table 3: Physical properties of desulfurized building gypsum

[0047]

[0048] Table 4: Basic physical performance indexes of gypsum dry-mixed...

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Abstract

The invention provides a method for preparing gypsum dry-mixed mortar through slag frying gypsum. Hot slag discharged form a gangue power plant is directly used for mixed frying of flue gas desulfurization gypsum in a slag frying machine; then a mixture is subject to refining and shaping in a ball mill and is then screened to prepare gypsum powder and slag sand; and an assistant is added to be subject to burdening mixing to prepare the gypsum dry-mixed mortar. According to the method, the flue gas desulfurization gypsum is fried through waste heat of the hot slag, the process for singly calcining the flue gas desulfurization gypsum is omitted, energy sources and investment for calcining equipment are saved, the production process is simple, the preparing cost is low, a new efficient resource utilization way is provided for the power plant slag and the flue gas desulfurization gypsum, and the double effects of environmental protection and waste utilizing are achieved.

Description

technical field [0001] The invention belongs to the technical field of industrial solid waste recycling and utilization, and in particular relates to a method for preparing gypsum dry-mixed mortar by frying gypsum with slag. Background technique [0002] my country's circulating fluidized bed coal gangue power generation technology has reached the international advanced level. The installed capacity of coal gangue and other low calorific value coal power generation has reached about 30 million kW, and the total installed capacity of the units under construction has reached about 35 million kW. The annual utilization of coal gangue has reached 2 More than 100 million tons, making a huge contribution to the country's energy conservation and emission reduction. At the same time, gangue power plants will emit a large amount of desulfurized gypsum and slag, which are difficult to use and cause waste of energy and resources in gangue power plants. [0003] The desulfurized gypsum ...

Claims

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Application Information

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IPC IPC(8): C04B28/14C04B11/036
CPCC04B11/036C04B28/144C04B2111/00017C04B18/061C04B24/06C04B24/383C04B24/00C04B2103/302
Inventor 周明凯李福洲
Owner 长治市武理工工程技术研究院
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