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Ardealite cement additives

A cement additive and phosphogypsum technology, which is applied in the field of cement production additives and phosphogypsum cement retarders, can solve the problems of affecting cement quality, difficulty in popularization and application, and low strength, so as to make full use of renewable resources, improve economic benefits, Effect of reducing energy and cement costs

Inactive Publication Date: 2007-04-25
冯丽
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, some technologies use phosphogypsum as the main raw material to produce cement retarders. The auxiliary materials added are complicated. The finished product has high moisture content, some as high as 15-20%, and the other is low strength, which affects the quality of cement and is difficult to popularize and apply.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] After storing 90Kg of phosphogypsum and 3Kg of lime for 18 hours, it is roasted at 107°C for 20 minutes in a vertical kiln, and then 2Kg of AHR rubber adhesion enhancer is stirred with the roasted material, and then squeezed on the rollers by a screw feeder. Compression molding machinery is continuously processed into products. The shape of the product is: elliptical pellets with a length of 50mm, a width of 40mm, and a thickness of 35mm. 2 O≤3.5%, compressive strength≥10Mpa. The shape and size of the product can be processed according to customer requirements, and can be processed into blocks, granules, spheres, etc.

Embodiment 2

[0028] After storing 92Kg of phosphogypsum and 5Kg of lime for 24 hours, it is roasted at 150°C for 35 minutes in a vertical kiln, and then 4Kg of AHR rubber adhesion enhancer is stirred with the roasted material, and then squeezed on the rollers by a screw feeder. The product is continuously processed on the compression molding machine, and the product shape is: a round pellet with a diameter of 40mm, and the water content is H 2 O ≤ 4%, compressive strength ≥ 10Mpa. The shape and size of the product can be processed according to customer requirements, and can be processed into blocks, granules, ovals, etc.

Embodiment 3

[0030] After storing 95Kg of phosphogypsum and 8Kg of lime for 36 hours, it is roasted at 170°C for 40 minutes in a vertical kiln, and then 5Kg of water-based paint adhesion enhancer is stirred with the roasted material, and then passed through the screw feeder on the counter roll Continuously processed into products on the extrusion molding machine, the product shape is: a round pellet with a diameter of 40mm, and the water content is H 2 O ≤ 4%, compressive strength ≥ 10Mpa. The shape and size of the product can be processed according to customer requirements, and can be processed into blocks, granules, ovals, etc.

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Abstract

The invention discloses a phosphogypsum ball cement additive in the cement additive preparing technical domain, which comprises the following steps: aging phosphogypsum with limestone; sintering aged compound under 107-170 deg.c for 20-40min; blending sintered product and adhesive reinforcer completely; squeezing; moulding.

Description

technical field [0001] The invention relates to the field of building material cement production, in particular to an additive for cement production, that is, a phosphogypsum cement retarder. Background technique [0002] Phosphogypsum is a solid waste in the phosphate fertilizer industry, and phosphoric acid is a wet-process phosphoric acid production process in the phosphate fertilizer industry. The extraction slurry is produced by phosphate rock powder, and then filtered and washed to obtain phosphoric acid. Phosphogypsum waste is produced in the process of filtering and washing. Generally, about 5-6 tons of phosphogypsum are produced for every ton of phosphoric acid produced, and 2.5-5 tons of phosphogypsum are discharged for every ton of diammonium phosphate produced. The output of wet-process phosphoric acid in my country is about 1 million tons, and with the rapid development of high-concentration compound fertilizer industry in recent years, the phosphogypsum dischar...

Claims

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Application Information

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IPC IPC(8): C04B22/14C04B103/22
Inventor 冯丽
Owner 冯丽
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