Technological method adopting ardealite and desulphurization gypsum for preparing high strength building gypsum

A technology for desulfurized gypsum and building gypsum, which is applied in the technical field of phosphogypsum and desulfurized gypsum to prepare high-strength building gypsum, can solve the problems of poor fluidity, loose structure and high water demand of cementitious materials, and achieves reduction of harm, improvement of strength, and change of solubility. effect on dissolution rate

Inactive Publication Date: 2009-12-09
ANJIENENG BUILDING MATERIALS DEV
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a process for preparing high-strength building gyp

Method used

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Embodiment Construction

[0014] Phosphogypsum and desulfurized gypsum of the present invention prepare the process for high-strength building gypsum, comprising the following steps:

[0015] (1) The raw materials are composed by mass percentage: 0.5-2% composite curing agent, 1.5-4 parts% composite alkaline activator, the balance is phosphogypsum or desulfurized gypsum, and the composite curing agent is potassium, magnesium, aluminum, silicon , sulfur and other metal salts, and the compound alkaline activator is calcium hydroxide, silicon-aluminum alkaline waste, etc.;

[0016] (2) The raw materials after the raw materials in step (1) are uniformly mixed are put into a calciner and calcined at a constant temperature within the range of 150-200° C. for 2 hours;

[0017] (3) naturally cooling the raw material calcined in step (2), and finely processing it by ball milling after cooling;

[0018] (4) Aging the finely ground raw materials in step (3) for 3 to 4 days.

[0019] The composition of each raw ...

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Abstract

The invention relates to a technological method adopting ardealite and desulphurization gypsum for preparing high strength building gypsum. The method includes the following steps: (1) raw materials include the components by mass percent: 0.5 to 2 percent of composite curing agent, 1.5 to 4 parts of composite alkali-activator and ardealite or desulphurization gypsum accounting for the rest amount; (2) after being uniformly mixed, the raw materials of the step (1) are led into a calcining furnace and then are calcinated for 2 to 3 hours at a constant temperature ranging from 150 to 200 DEG C; (3) the calcinated raw materials of the step (2) are naturally cooled, and then are ground to be fine by ball milling after cooling; and (4) the raw materials of the step (3), which are ground to be fine, are aged for 3 to 4 hours, thereby obtaining the product. The invention can effectively avoid secondary environmental pollution, greatly reduces the damage of microelements contained in the ardealite on human bodies and environment, avoids the defects of normal distribution of ardealite particles, heavily high concentration of particle distribution, poor flowability of cementitious materials, high water demand, loose structure, low strength, and the like, and can prepare high strength hemihydrate ardealite powder and desulphurization gypsum powder.

Description

technical field [0001] The invention relates to a process method for preparing high-strength building gypsum from phosphogypsum and desulfurized gypsum and a use method thereof. Background technique [0002] Phosphogypsum is the industrial waste discharged from the production process of wet-process phosphoric acid in phosphorus chemical industry. One ton of wet-process phosphoric acid (in P 2 o 5 total) to produce 4.5-5 tons of phosphogypsum. The main component of phosphogypsum is calcium sulfate, the chemical formula is CaSO 4 2H 2 O, in addition to containing a variety of other impurities. Impurities such as fluoride, free phosphoric acid, organic matter, and radioactivity contained in phosphogypsum are the main factors that cause environmental pollution during the storage of phosphogypsum. The large stockpiling of phosphogypsum not only encroached on land resources, but also polluted the atmosphere, water system and soil due to wind erosion and rain. Prolonged expos...

Claims

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Application Information

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IPC IPC(8): C04B11/26
CPCC04B11/26C04B2111/00025C04B2111/00017C04B11/264
Inventor 赵四渝鲁红允
Owner ANJIENENG BUILDING MATERIALS DEV
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