Device and method for producing self-excited II type anhydrous gypsum by utilizing industrial byproduct gypsum

A technology for industrial by-products of gypsum and anhydrous gypsum, which is applied in the field of comprehensive utilization industry and chemical gypsum recycling, and can solve the problems of inability to perform feedback control, inability to judge the quality of type II anhydrite, and inability to solve the problems of deep utilization of energy, etc. , to achieve energy saving, low free moisture, and reduced equipment corrosion

Active Publication Date: 2021-01-26
辽宁东大粉体工程技术有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] CN110498628A patent reports a kind of anhydrous gypsum preparation system, heat is supplied by a two-stage combustion hot blast stove, and is equipped with a flue gas purification system, but it does not solve the deep utilization of energy well
However, judging from actual cases, it is impossible to judge the quality of Type II anhydrite burned out, and it is impossible to perform feedback control

Method used

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  • Device and method for producing self-excited II type anhydrous gypsum by utilizing industrial byproduct gypsum

Examples

Experimental program
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Effect test

Embodiment 1

[0066] In this embodiment, a device for producing type II anhydrite by using industrial by-product gypsum, the schematic diagram of its structure is as follows figure 1 As shown, it includes two-stage dynamic calcination system 3, rotary flash drying system 2, industrial by-product gypsum pretreatment system 1, type II anhydrous gypsum cooling system 4 and system high-pressure induced draft fan 5 and pipeline system, industrial by-product gypsum Pretreatment system 1, spin flash drying system 2, two-stage dynamic calcination system 3 and type II anhydrite cooling system 4 are connected through pipelines in turn, and the system high-pressure induced draft fan 5 is connected to spin flash drying system 2, the specific systems The connection relationship between components is:

[0067] Both the raw material feeder 11 and the additive feeder 12 are connected to the stirring mixer 13, the stirring mixer 13 is connected to the spin flash dryer 21 through the dryer feeder 22, and the...

Embodiment 1-2

[0084] Same as Example 1-1, the difference is that the raw material is Yunnan Yuntianhua stock desulfurization gypsum, the main components are the same, and the raw material also includes H 2 SO 4 and H 3 PO 4 Waiting for waste, the pH value is 1.5, the gypsum is not washed, and the same amount of crystal lattice agent is directly added, and at the same time, a neutralizer-calcium oxide with a mass ratio of 0.8% of the stock gypsum is added; a standard test block is prepared for testing. The initial setting time is 104 minutes, the final setting time is 225 minutes, the compressive strength is 26MPa, and the flexural strength is 6MPa.

Embodiment 2

[0086] With embodiment 1, difference is:

[0087] The second step is to add a crystal lattice agent, which is composed of carbide slag and KAlSO 4 50% each, accounting for 2% of the mass of the dehydrated gypsum.

[0088] The fourth step is the standard test block test. The initial setting time is 79 minutes, the final setting time is 197 minutes, the compressive strength is 34MPa, the flexural strength is 9MPa, and the organic matter removal rate reaches over 99%.

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Abstract

The invention discloses a device and method for producing self-excited II type anhydrous gypsum by utilizing industrial byproduct gypsum. The process device comprises a two-stage dynamic cyclone calcining system, a rotary flash evaporation drying system, an industrial byproduct gypsum pretreatment system, a II type anhydrous gypsum cooling system, a system high-pressure induced draft fan, a pipeline system and the like. The process method comprises the step of continuously and sequentially performing operations according to the type and property of an industrial by-product gypsum material; performing raw material selective dehydration, performing pretreatment, performing drying dehydration, performing two-stage dynamic calcination and performing II type anhydrous gypsum product cooling process treatment. A process device system is totally closed, negative pressure state operation is achieved, echelon utilization of system heat is achieved, and energy conservation and consumption reduction are achieved. A high-quality II-type anhydrous gypsum product which is excellent in mechanical property and capable of realizing self-excitation subsequently can be prepared from the industrial by-product gypsum, so that the resource utilization of the industrial by-product gypsum is expanded, and the method and the production device can realize large-scale industrial production.

Description

Technical field: [0001] The invention belongs to the industrial technical field of chemical gypsum resource utilization and comprehensive utilization, and in particular relates to a process device and method for producing self-excited type II anhydrous gypsum by utilizing industrial by-product gypsum. Background technique: [0002] At present, my country's industrial by-product gypsum is mainly desulfurized gypsum and phosphogypsum, and the annual discharge can reach nearly 100 million tons, of which about 80% chemical gypsum has not been effectively treated or resource utilization, including the newly discharged industrial by-product gypsum, namely fresh gypsum; and stock gypsum formed by draining and stockpiling. In our country, the production of Type II anhydrite from industrial by-product gypsum is basically still in the stage of theoretical research and application technology discussion. In Japan, developed countries in Europe and the United States, it has been widely u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/036C04B11/024C04B11/00
CPCC04B11/036C04B11/024C04B11/007
Inventor 张继宇关彦光涂学炎
Owner 辽宁东大粉体工程技术有限公司
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