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Method for preparing special anhydrite gel material by treating phosphogypsum by using tunnel kiln device

A technology for cementing materials and anhydrite, which is applied in the field of special anhydrite cementing materials made from phosphogypsum, can solve the problems of environment, groundwater and soil pollution, limited application consumption and limited consumption, and achieves protection of ecological environment and nature. Environment, avoid over-exploitation and consumption, reduce the effect of comprehensive utilization cost

Active Publication Date: 2015-11-18
湖南省小尹无忌环境能源科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large amount of discarded phosphogypsum has objectively caused serious pollution and damage to the environment, groundwater and soil
[0004] At present, the research and application of phosphogypsum are mainly focused on four aspects. One is to modify phosphogypsum with lime, that is, add lime to neutralize the soluble phosphate and fluorophosphate in it, and replace natural gypsum for cement production. However, the application effect is not ideal objectively, and the actual consumption is very limited; the second is to convert phosphogypsum into hemihydrate gypsum or a compound of hemihydrate gypsum and soluble anhydrite, that is, 250-500 ℃ Low-temperature heat treatment of building gypsum powder, used to produce gypsum powder, gypsum board, gypsum block and other products, but because the grade and color of phosphogypsum are far inferior to natural gypsum, and contain a certain amount of harmful elements and harmful impurities, and building gypsum products are water-resistant Poor, its actual application consumption is still limited; third, phosphogypsum and lime, cinder, fly ash are mixed and pressed to make bricks after curing, but due to the influence of harmful impurities and harmful elements and the autoclaved curing process can be compared It is good to ensure the volume stability of brick products, but its popularization and application is not ideal; fourth, it is the by-product cement of sulfuric acid production, which leads to popularization and application due to large investment, low sulfuric acid grade, poor economy, and large secondary pollution. obstructed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The tunnel kiln production line process equipment of a shale brick factory is used to process phosphogypsum to produce special anhydrite cementitious materials:

[0037] (1) Batching and homogenization: Crush the stored agglomerated phosphogypsum and stone coal (calorific value 978kcal / kg) to a particle size <35mm, and mix 50 parts of phosphogypsum, 15 parts of stone coal and 35 parts of mud-containing waste rock chips (particle size<5mm) are batched by microcomputer, continuously sent to the Raymond mill system, mixed and ground to make a 80 μm sieved powder with a quality of 26%, and then 15 parts of water are added and mixed evenly into plastic material;

[0038] (2) Forming: the plastic material obtained in step (1) is formed into a porous brick-like material by a brick-making forming machine;

[0039] (3) Tunnel kiln calcination: send the porous brick-like material obtained in step (2) into the tunnel kiln, dry and preheat, enter the high-temperature calcination z...

Embodiment 2

[0046] The tunnel kiln production line process equipment of a refractory brick factory is used to process phosphogypsum to produce special anhydrite cementitious materials:

[0047] (1) Batching and homogenization: crush stone coal (calorific value 1317kcal / kg) and dry-process acetylene carbide slag to a particle size of <20mm, and mix 71 parts of dried granular phosphogypsum (particle size <10mm), 9 parts of stone coal and 20 parts of dry-process acetylene carbide slag are batched by computer, and continuously sent to the Raymond mill system, mixed and ground to make a powder with 80 μm sieve quality of 21%, and then 8 parts of water are added, and the Mixing and homogenizing into plastic materials;

[0048] (2) Forming: The plastic material obtained in step (1) is formed into a brick-shaped material by a brick-making machine, and dried naturally;

[0049] (3) Tunnel kiln calcination: send the naturally dried brick-like material obtained in step (2) into a tunnel kiln, and c...

Embodiment 3

[0056] The tunnel kiln production line process equipment of a refractory brick factory is used to process phosphogypsum to produce special anhydrite cementitious materials:

[0057] (1) Batching and homogenization: crush the dry-process acetylene carbide slag to a particle size of <35mm, and mix 15 parts of ridged dewatered municipal sludge (calorific value 1875kcal / kg) and 20 parts of dry-process acetylene carbide slag in parts by weight The slag is batched by the first-level microcomputer, and mixed and ground to make a powder with a mass of 25% of the 80μm sieve, and then the obtained powder is mixed with 65 parts of fresh phosphogypsum with water content (moisture content 30.7wt%, particle size <1mm). The second-stage microcomputer batching is sent to the rolling and mixing device to be homogenized into plastic materials through rolling and mixing;

[0058] (2) Forming: The plastic material obtained in step (1) is formed into a brick-shaped material by a brick forming mach...

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Abstract

The invention relates to a method for preparing a special anhydrite gel material by treating phosphogypsum by using a tunnel kiln device. The method comprises the following steps: (1) blending and homogenizing: blending 48-75 parts of phosphogypsum, 8-25 parts of stone coal and 15-50 parts of waste rock residues, grinding the mixture into powder, adding 8-18 parts of water, and uniformly and homogenizing the mixture to a plastified material; (2) molding: molding the plastified material to a molded material; (3) calcining the tunnel kiln: sending the molded material in the tunnel kiln, calcining the molded material for 20-60 minutes at 980-1300 DEG C, and quenching the molded material to obtain the special anhydrite matured residues. and (4) preparing the special anhydrite gel material: grinding the special anhydrite matured residues to obtain the special anhydrite gel material. The special anhydrite gel material prepared by the method provided by the invention contains various hydrated active minerals, can be widely used for cement industry, is high in strength if being used, and is non-cracking and is high in strength if being used as masonry cement or cement making bricks. The method provided by the invention is low in investment, free of wastewater and waste residues and good in economical benefit.

Description

technical field [0001] The invention relates to a method for preparing a special anhydrite cementitious material from phosphogypsum, in particular to a method for processing the special anhydrite cementitious material from phosphogypsum with tunnel kiln equipment. Background technique [0002] Phosphogypsum is the waste residue discharged from phosphoric acid or phosphate fertilizer in the phosphating chemical industry. The main component is gypsum-based sulfate, with a content of 78-96%, followed by quartz SiO containing 4-22%. 2 , Soluble phosphate and fluorophosphate and insoluble phosphate, fluorophosphate and aluminosilicate minerals, and contain a small amount of harmful heavy metal elements such as cobalt, strontium, lead, cadmium, etc. [0003] The newly discharged phosphogypsum is a granular material, and it is easy to raise dust when it is disposed of and stored. However, under the action of an appropriate amount of water, the gypsum can be slowly recrystallized an...

Claims

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Application Information

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IPC IPC(8): C04B11/26
Inventor 尹无忌
Owner 湖南省小尹无忌环境能源科技开发有限公司
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