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Phosphogypsum cement retarder and preparation method

A technology of cement retarder and phosphogypsum, which is applied in the field of comprehensive utilization of renewable resources, can solve the problems of not paying attention to the recycling of available sulfur, increasing the discharge cost of chemical enterprises, and the low utilization rate of phosphogypsum, so as to achieve short storage time and improve utilization efficiency and reduce energy consumption

Inactive Publication Date: 2012-10-17
广西凯浩环保材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the production of domestic cement retarders is done by stacking raw materials in chemical plants, and the raw materials enter the retarder production line after two or three loading and unloading, which increases the emission costs of chemical enterprises; in the production process of retarders, there is no Pay attention to the recycling of available sulfur, resulting in a waste of resources; if there is a calcination process, use forward calcination and drying, the drying time is too long and there is no waste heat utilization procedure, and the natural drying preparation method does not have a high utilization rate of phosphogypsum
Although some improved methods have also appeared (such as Chinese patent applications 99116529.2, 201010204570.4, 200810046201.X), the above-mentioned defects still exist in the preparation methods of these disclosed phosphogypsum cement retarders

Method used

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  • Phosphogypsum cement retarder and preparation method
  • Phosphogypsum cement retarder and preparation method
  • Phosphogypsum cement retarder and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] raw material source

[0017] Phosphogypsum slag (accounting for 95% of the total weight) - the production discharge port of Guangxi Luzhai Fertilizer Co., Ltd.

[0018] Alkaline calcareous (4% by weight) - limestone slurry from surrounding limestone plants.

[0019] Modifier (1% by weight) - Na 2 SO 4 tailings.

[0020] Industrial wastewater—wastewater from a phosphate rock ball mill workshop in a fertilizer factory.

[0021] Residual hot water - the hot water exchange of the fluidized furnace of the rotary dryer in this process.

[0022] process flow

[0023] Open the feed valve, open the 30-mesh filter screen, directly connect the phosphogypsum slurry discharged from the phosphoric acid reaction of chemical enterprises to the 30-mesh vibrating screen, and at the same time wash the phosphogypsum slag with industrial wastewater to screen out about 10% of mineral impurities and insoluble impurities , and then add 3% alkaline calcareous substance quantitatively to a...

Embodiment 2

[0025] raw material source

[0026] Phosphogypsum slag (accounting for 95% of the total weight) - the production discharge port of Guangxi Luzhai Fertilizer Co., Ltd.

[0027] Alkaline calcareous substances (accounting for 3.5% of the total weight) - calcium carbide slag discharged from caustic soda production in Liuzhou Chemical Plant, Guangxi.

[0028] Modifier (1.5% by weight) - BaSO 4 tailings.

[0029] Industrial wastewater—wastewater from a phosphate rock ball mill workshop in a fertilizer factory.

[0030] Residual hot water - the hot water exchange of the fluidized furnace of the rotary dryer in this process.

[0031] process flow

[0032] Open the feed valve, open the 30-mesh filter screen, directly connect the phosphogypsum slurry discharged from the phosphoric acid reaction of chemical enterprises to the 30-mesh vibrating screen, and at the same time wash the phosphogypsum slag with industrial wastewater to screen out about 10% of mineral impurities and insolubl...

Embodiment 3

[0034] raw material source

[0035] Phosphogypsum slag (accounting for 93% of the total weight) - the production discharge port of Guangxi Luzhai Fertilizer Co., Ltd.

[0036] Alkaline calcium-enhancing substance (accounting for 5% of the total weight) - Guangxi Fengtang Paper Industry calcium-enhancing alkali slag.

[0037] Modifier (2% by weight) - Na 2 SO 4 tailings.

[0038] Industrial wastewater—wastewater from a phosphate rock ball mill workshop in a fertilizer factory.

[0039] Residual hot water - the hot water exchange of the fluidized furnace of the rotary dryer in this process.

[0040] process flow

[0041] Open the feed valve, open the 30-mesh filter screen, directly connect the phosphogypsum slurry discharged from the phosphoric acid reaction of chemical enterprises to the 30-mesh vibrating screen, and at the same time wash the phosphogypsum slag with industrial wastewater to screen out about 10% of mineral impurities and insoluble impurities , and then add...

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Abstract

The invention discloses a phosphogypsum cement retarder and a preparation method thereof. The cement retarder is prepared from the following raw materials in percentage by weight: 90-95% of phosphogypsum, 2-5% of alkaline calcium-increase agent and 0.5-2% of modifier. The preparation method comprises the following steps: screening the raw materials, filtering, calcifying, calcining and drying under reflux, balling and granulating, and the like. In the invention, the raw material from the discharge port of the chemical industry enterprise is directly connected into the production line, and the phosphogypsum slag is modified for production, thereby avoiding the phosphogypsum stock and environmental pollution, maximally and fully utilizing the phosphogypsum raw material and recycling the effective phosphorus. When being used for producing cement, various properties of the phosphogypsum cement retarder are better than those of natural gypsum, thereby utilizing the waste, protecting the environment, greatly lowering the discharge treatment cost of the chemical industry enterprise, and greatly enhancing the economic benefit of the cement production enterprise.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of renewable resources, in particular to a phosphogypsum cement retarder and a preparation method thereof. Background technique [0002] Phosphogypsum is the industrial waste slag discharged during the production process of phosphorus chemical enterprises. With the rapid development of phosphorus chemical industry, the phosphogypsum discharged by phosphorus chemical enterprises in my country reaches 50 million tons every year, while the utilization rate of phosphogypsum resources is less than 20%. . In the comprehensive treatment and utilization of phosphogypsum, making it into cement retarder to replace natural gypsum for production is one of the main utilization methods of phosphogypsum at present. It is conducive to the comprehensive treatment and utilization of industrial waste residues, reducing the land occupation of waste residues, Protect the environment, reduce the cost ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/14B09B3/00
Inventor 刘晓刚易伟朱中彩
Owner 广西凯浩环保材料股份有限公司
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