Process for preparing high-activity semi-hydrated gypsum cementing material and gypsum product by aid of phosphorous gypsum

A technology of hemihydrate gypsum and cementitious materials, applied in the field of production of gypsum cementitious materials and gypsum products, can solve the problems of high production energy consumption, high investment, high production cost, etc., and achieve saving of operating costs, easy process control, and reliability increased effect

Inactive Publication Date: 2012-07-25
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the production of high-strength α-hemihydrate gypsum in my country is mainly made of natural dihydrate gypsum under autoclaved or high-pressure hydrothermal conditions, which has the problems of high production energy consumption and high production cost.
In the prior art, the preparation of α-type high-strength gypsum is carried out under autoclaved conditions, which requires relatively high investment and steam heat source, while the atmospheric pressure hydrot

Method used

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  • Process for preparing high-activity semi-hydrated gypsum cementing material and gypsum product by aid of phosphorous gypsum
  • Process for preparing high-activity semi-hydrated gypsum cementing material and gypsum product by aid of phosphorous gypsum
  • Process for preparing high-activity semi-hydrated gypsum cementing material and gypsum product by aid of phosphorous gypsum

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0025] Example 1:

[0026] A process for preparing high-activity semi-hydrated gypsum cementing material from phosphogypsum, which includes the following processes:

[0027] 1) Phosphogypsum pretreatment process: The phosphogypsum used in this example is a by-product of wet-process phosphoric acid production and is in powder form. Its adsorbed water content is 25%, calcium sulfate dihydrate content is 98%, and soluble phosphorus content is 0.86%. The soluble fluorine content is 0.21%, the organic content is 0.12%, the soluble phosphorus content of the phosphogypsum is 0.095%, the soluble fluorine content is 0.05%, the organic content is 0.01%, and the phosphogypsum slurry is dehydrated.

[0028] 2) Atmospheric pressure hydrothermal reaction process: the pretreated phosphogypsum slurry and crystal mordant are added to a 2.0mol / L calcium chloride solution and mixed to form a slurry. The phosphogypsum and calcium chloride solution are contained in the slurry. The mass ratio is 1:9~3:2...

Example Embodiment

[0034] Example 2:

[0035] A process for preparing high-activity semi-hydrated gypsum cementing material with phosphogypsum. The preparation steps are basically the same as those in Example 1. The difference from Example 1 is that the mass percentage of phosphogypsum and calcium chloride solution is maintained at 1:1. The rotation speed of the stirring blade is 200 rpm, and the molar concentration of calcium chloride, the reaction temperature, the temperature of the washing hot water and the drying temperature of the slurry in the solution of the serial number 3 sample preparation process of Example 1 are sequentially changed, See Table 2 for the comparison of the content of the diacid medium crystal agent, the reaction time and the dry compressive strength of the product.

[0036] Table 2 Comparison of results of calcium chloride molar concentration, succinic acid content, reaction time and product dry compressive strength

[0037]

Example Embodiment

[0038] Example 3:

[0039] A process for preparing high-activity semi-hydrated gypsum cementing material from phosphogypsum. The preparation steps are basically the same as those in Example 1. The difference from Example 1 is that the mass ratio of phosphogypsum to calcium chloride solution is maintained at 1:1. The rotation speed of the stirring blade is 200 rpm, and the sequence number of Example 1 is changed sequentially. 3 Sample preparation process 1) The type and preparation process of the modifier in 2) The type and dosage of the crystal mordant, and the impurity content of phosphogypsum after pretreatment , The comparison of the results of the dry compressive strength of the crystal medium and the product is shown in Table 3.

[0040] Table 3 Comparison of results of dry compressive strength of phosphogypsum impurity content, crystal mordant and product after pretreatment

[0041]

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Abstract

The invention relates to a process for preparing a high-activity semi-hydrated gypsum cementing material and a gypsum product by the aid of phosphorous gypsum. The process includes technical processes of 1) a pretreatment process for the phosphorous gypsum; 2) a normal-pressure water heating reaction process; 3) a slurry preparation process; and 4) a preparation process for the high-activity semi-hydrated gypsum cementing material and the gypsum product. The process for preparing the high-activity semi-hydrated gypsum cementing material and the gypsum product by the aid of the phosphorous gypsum has the advantages that a process for preparing the high-performance semi-dehydrated gypsum cementing material by the aid of the phosphorous gypsum is completed under the normal-pressure mild condition, the process can be combined with an independent gypsum product manufacturing process to produce gypsum blocks, gypsum plates or other semi-hydrated gypsum products, and production flexibility of the technical processes is realized. In addition, owing to normal-pressure conversion, investment cost and running cost are saved, the processes are easily controlled, reliability is improved, performances of the product are excellent, materials are wet during the process which adopts wet phosphorous gypsum raw materials and produces the product, flying dust is prevented, waste is utilized, and effects of saving energy and protecting environments are realized.

Description

technical field [0001] The invention relates to the technical field of producing gypsum cementitious materials and gypsum products using phosphogypsum as raw material, in particular to an atmospheric pressure hydrothermal method using phosphogypsum at low cost and low energy consumption to prepare highly active hemihydrate gypsum cementitious materials and gypsum products craft. Background technique [0002] Phosphogypsum is a precipitate mainly composed of calcium sulfate dihydrate discharged from the production process of wet-process phosphoric acid, and is the most important industrial by-product in the production of phosphorus chemical industry. Normally, the production of 1 ton of P 2 o 5 It is necessary to discharge 4.5 to 5.5 tons of phosphogypsum. For a long time, the use of phosphogypsum has become an international technical problem due to the acidity of certain impurities such as phosphorus, fluorine, and organic matter, so the main storage measures are taken. ...

Claims

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Application Information

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IPC IPC(8): C04B11/26
Inventor 马保国茹晓红卢斯文邹开波付浩兵
Owner WUHAN UNIV OF TECH
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