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Method for producing cement retarder through phosphogypsum

A cement retarder and phosphogypsum technology, applied in the direction of solid waste removal, etc., can solve the problems of unsatisfactory setting time, unstable quality of phosphogypsum, large energy consumption, etc., and achieve high production efficiency and significant economic benefits , The effect of low impurity content in the product

Inactive Publication Date: 2013-01-23
SICHUAN LISEN BUILDING MATERIALS SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the disadvantages of this process are: 1. The quality of phosphogypsum is not stable enough, especially the setting time sometimes does not meet the requirements
2. β-phosphogypsum needs to be calcined, and the product needs to be dried after granulation, which consumes a lot of energy
3. The flue gas produced by calcining β-phosphogypsum pollutes the environment

Method used

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  • Method for producing cement retarder through phosphogypsum
  • Method for producing cement retarder through phosphogypsum

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Embodiment Construction

[0030] Technical process of the present invention sees figure 1 : The water content of phosphogypsum from the phosphochemical plant is generally about 15%, and it is sent to the production site by a belt conveyor, and calcium carbide slag is added as a modifier in an amount of 3-5% of the weight of phosphogypsum, and polysilicon waste residue is added as a quality improvement The addition amount is 1% of the weight of phosphogypsum; it is sent to the double-rotor crusher to mix and crush until the particle size is less than 5mm, and then stored in the shed for aging for more than 24 hours, and then heated and dried with an electromagnetic heating dryer, and the heating temperature is controlled at 290~310℃, until the water content is 12%, then transport it into the kneading machine with the belt conveyor, when transporting the material, use the fan to blow on the belt conveyor, remove the surface water of the mixture, and reduce the water content to 10%; Then use a kneading ma...

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Abstract

The invention relates to a method for producing a cement retarder through scrap phosphogypsum, which comprises the following steps: 1. adding a modifying agent and a quality improver into phosphogypsum and mixing; 2. pulverizing the mixture through a pulverizer; 3. stacking and aging the pulverized mixture; 4. drying the aged mixture; 5. kneading and compacting the dried mixture through a kneading machine; and 6. granulating through a granulator. The invention has the advantages of short process flow, high production efficiency, low content of product impurities, stable quality, particularly low consumption and remarkable economic benefit.

Description

technical field [0001] The invention relates to a production method of a cement retarder, in particular to a method for producing a cement retarder by using waste phosphogypsum. Background technique [0002] Phosphogypsum is used as a cement retarder in different degrees all over the world, among which Japan is better used, followed by Britain and Germany. At present, 75% of cement retarders in Japan come from phosphogypsum, and 25% use other chemical gypsum. Phosphogypsum cement retarders in Japan and Germany all adopt the semi-aqueous technology route, that is, adding modifiers to neutralize harmful impurities, converting them into inert substances, and then calcining at an appropriate temperature to obtain soluble anhydrous and semi-aqueous substances, and finally Add water to form a ball. The semi-water technology route has a long process flow, many auxiliary equipment and staffing, high energy consumption, waste water discharge, and pollutes the environment. [0003]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/00B09B3/00C04B103/22
Inventor 靳武士李经宏周海燕
Owner SICHUAN LISEN BUILDING MATERIALS SCI & TECH DEV