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Method for preparing gypsum whisker by using phosphate tailings and raffinate phosphoric acid

A technology of gypsum whiskers and raffinate phosphoric acid, which is applied in chemical instruments and methods, single crystal growth, crystal growth, etc., can solve the problems of increasing production costs of whiskers, solve environmental problems, regulate crystal forms, and reduce production costs Effect

Inactive Publication Date: 2015-02-04
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Both of the above two common preparation methods use gypsum that has formed irregular crystals as the raw material for preparation. To obtain qualified gypsum whiskers after controlling the recrystallization of gypsum, this will undoubtedly increase the production cost of whiskers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Take 100g of phosphorus tailings powder with a particle size of 100 mesh, add water to make tailings slurry with a solid content of 30%, gradually add raffinate phosphoric acid and control the pH value to 1.5, the reaction temperature is 90°C, the stirring speed is 300rpm, the reaction time 4h, filter after the end of the reaction, slowly add 540g of sulfuric acid solution with a mass fraction of 5% in the filtrate, control the reaction temperature at 90°C, the reaction time for 60min, and the stirring speed at 120rpm, filter after the end of the reaction, and wash the filter cake with 200ml of distilled water for 2 hours each time. After the second time, put it in a drying oven, and dry it at 60°C for 2 hours to obtain the product calcium sulfate whisker. The purity of the product is 99%, the average length is 150 μm, and the average diameter is 3 μm.

[0010]

Embodiment 2

[0012] Take 100g of phosphorus tailings powder with a particle size of 100 mesh, add water to make a tailings slurry with a solid content of 20%, gradually add raffinate phosphoric acid and control the pH value to 2, the reaction temperature is 80°C, the stirring speed is 300rpm, the reaction time 3h, filter after the reaction is over, slowly add 540g of sulfuric acid solution with a mass fraction of 10% in the filtrate, control the reaction temperature at 90°C, the reaction time for 60min, and the stirring speed at 150rpm, filter after the reaction, and wash the filter cake with 200ml of distilled water for 2 hours each time After the second time, put it in a drying oven, and dry it at 60°C for 2 hours to obtain the product calcium sulfate whisker. The purity of the product is 98.8%, the average length is 120 μm, and the average diameter is 2 μm.

Embodiment 3

[0014] Take 100g of phosphorus tailings powder with a particle size of 200 mesh, add water to make a tailings slurry with a solid content of 50%, gradually add raffinate phosphoric acid and control the pH value to 3, the reaction temperature is 70°C, the stirring speed is 200rpm, the reaction time 2h, filter after the reaction is over, slowly add 540g of sulfuric acid solution with a mass fraction of 20% in the filtrate, control the reaction temperature at 90°C, the reaction time for 60min, and the stirring speed at 200rpm, filter after the reaction, and wash the filter cake with 200ml of distilled water for 2 hours each time After the second time, place it in a drying oven, and dry it at 60°C for 2 hours to obtain the product calcium sulfate whisker. The purity of the product is 98.2%, the average length is 80 μm, and the average diameter is 3 μm.

[0015]

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Abstract

The invention discloses a method for preparing gypsum whisker by using phosphate tailings and raffinate phosphoric acid. A technical scheme adopted in the invention is characterized in that the method comprises the following steps: taking a certain amount tailing powder with a certain particle size, adding a certain amount of distilled water to prepare a tailing slurry with a certain solid content, gradually adding raffinate phosphoric acid, reacting under certain conditions, filtering after the reaction, gradually adding a certain concentration of sulfuric acid into the obtained filtrate, reacting for a certain time, filtering, washing the obtained filter cake, and drying the washed filter cake in a drying box to obtain the gypsum whisker. The gypsum whisker is prepared through a two-step technology by using the raffinate phosphoric acid, the phosphate tailings and other phosphorus chemical industry enterprise waste resources as raw materials, and the growth form of the crystals of the gypsum whisker is controlled in the formation process of the phosphate crystals, so compared with traditional gypsum whisker preparation technologies, the method has the advantages of production cost reduction, solving of the environmental protection problem of the phosphorous chemical enterprises to a certain extent, and full use of magnesium resources in the raffinate phosphoric acid and the tailings.

Description

technical field [0001] The invention belongs to the field of phosphorus chemical manufacturing, and in particular relates to a preparation process of calcium sulfate whiskers. technical background [0002] CaSO 4 Whiskers, also known as gypsum whiskers, are CaSO 4 Fibrous single crystal, like gypsum, has anhydrous, semi-hydrated and dihydrated points. Gypsum whiskers can enhance polymer mechanical properties, heat resistance and many other properties, and are widely used in aviation, aerospace and many civil industries. Moreover, the use of gypsum whiskers as a reinforcing material has the advantages of stable size, high strength, good toughness, high temperature resistance, chemical corrosion resistance, easy surface treatment, and strong affinity for polymers such as rubber and plastics. Medium-strength reinforcing agents can be used. Added to plastic rubber, it can improve the tensile strength, bending strength, elastic modulus and thermal deformation temperature of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B7/14C30B29/62C30B29/46
Inventor 李文飞郭举张丹杨丽萍解田白家赫
Owner WENGFU (GRP) CO LTD
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