Method utilizing calcium carbide slag as raw material to produce gypsum crystal whisker

A technology of gypsum whiskers and carbide slag, which is applied in the field of comprehensive utilization of solid waste, can solve the problems of complex reaction steps, high production cost, and long production cycle, and achieve the effect of cheap raw materials, low cost, and large operating flexibility

Inactive Publication Date: 2014-03-26

CHINA UNIV OF GEOSCIENCES (WUHAN)

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Problems solved by technology

[0019] The above patents proposed different methods to prepare gypsum whiskers, basically using gypsum or other chemic...

Abstract

The invention relates to a method utilizing calcium carbide slag as a raw material to produce a gypsum crystal whisker, and belongs to the field of inorganic material preparation and solid waste comprehensive utilization. The method utilizing calcium carbide slag as the raw material to produce the gypsum crystal whisker is characterized by comprising the following steps: (1) drying, ball milling and calcining the calcium carbide slag; (2) enabling the obtained calcium carbide slag to react with dilute sulfuric acid after the calcining treatment step, and washing and centrifuging the precipitation product; (3) mixing the solid obtained in the step (2) with water to prepare size, adding a crystal aid with a certain mass fraction in the size, transferring the mixed solution in a hydrothermal reaction kettle to carry out hydrothermal reaction, and washing, centrifuging and drying the product after the hydrothermal reaction to obtain the gypsum crystal whisker product prepared by taking the calcium carbide as the raw material. The method is mild in reaction conditions, simple in process, flexible in operation, and easy for industrial production. The prepared gypsum crystal whisker is large in draw ratio and good in reinforcing performance.

Application Domain

Polycrystalline material growthFrom normal temperature solutions +1

Technology Topic

Drawing ratioGypsum +8

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Examples

Experimental program(4)

Example Embodiment

[0044] Example 1:

[0045] A method for producing gypsum whiskers using calcium carbide slag as a raw material, which includes the following steps:

[0046] (1) Dry the calcium carbide slag at 120°C for 3 hours, then ball mill for 10 minutes, and then calcinate at 900°C for 1 hour;

[0047] (2) Mix the calcined calcium carbide slag and dilute sulfuric acid (50% sulfuric acid mass fraction) in a ratio of 1:3 by volume, stir evenly, and then react for 5 hours at 80°C in a water bath. During the reaction Magnetic stirring at a stirring speed of 1000 rpm; the product after the reaction was washed with water to a pH value of 7, and then centrifuged (2000 rpm, 30 minutes) to obtain a solid product;

[0048] (3) The solid obtained in step (2) above is slurried with water, the slurry concentration is controlled to 1% (mass ratio), ethylene glycol is added (the mass is 0.5% of the solids in the slurry), and then transferred to hydrothermal Hydrothermal reaction at 110°C in the reaction kettle for 10 hours; wash the product after the hydrothermal reaction to a pH value of 7, and then centrifuge (2000 rpm, 15 minutes) and dry (120°C, 5 hours) to obtain the The gypsum whisker product prepared by using calcium carbide slag as a raw material of the invention.

[0049] The gypsum whiskers prepared in Example 1 had an aspect ratio of 50, a length of 150 microns, a width of 3 microns, and a purity of 90%.

Example Embodiment

[0050] Example 2:

[0051] A method for producing gypsum whiskers using calcium carbide slag as a raw material, which includes the following steps:

[0052] (1) Dry the calcium carbide slag at 70°C for 10 hours, then ball mill for 15 minutes, and then calcinate at 500°C for 5 hours;

[0053] (2) Mix the calcined calcium carbide slag and dilute sulfuric acid (25% sulfuric acid mass fraction) in a ratio of 1:5 by volume, stir evenly, and then react for 30 hours at 30°C in a water bath. During the reaction Magnetic stirring, the stirring speed is 200 rpm; the product after the reaction is washed with water until the pH value is equal to 7, and then centrifuged (4000 rpm, 5 minutes), dried (60 ℃, 12 hours);

[0054] (3) The solid obtained in step (2) above is slurried with water, the slurry concentration is controlled to 10% (mass ratio), ethylene glycol is added (the mass is 3% of the solids in the slurry), and then transferred to hydrothermal Hydrothermal reaction at 180℃ in the reactor for 4 hours; wash the product after the hydrothermal reaction to a pH value of 7, and then centrifuge (4000 rpm, 5 minutes) and dry (70℃, 12 hours) to obtain the The gypsum whisker product prepared by using calcium carbide slag as a raw material of the invention.

[0055] The gypsum whiskers prepared in Example 2 had an aspect ratio of 60, a length of 120 microns, a width of 2 microns, and a purity of 95%.

Example Embodiment

[0056] Example 3:

[0057] A method for producing gypsum whiskers using calcium carbide slag as a raw material, which includes the following steps:

[0058] (1) Dry the calcium carbide slag at 80°C for 5 hours, then ball mill for 5 minutes, and then calcinate at 700°C for 3 hours;

[0059] (2) Mix the calcined calcium carbide slag and dilute sulfuric acid (35% sulfuric acid mass fraction) in a ratio of 1:1 by volume, stir evenly, and then react for 10 hours at a water bath temperature of 50°C. During the reaction Magnetic stirring at a stirring speed of 3000 rpm; wash the reaction product with water until the pH value is equal to 7, then centrifuge (3000 rpm, 10 minutes), and dry (120°C, 5 hours);

[0060] (3) The solid obtained in step (2) above is slurried with water, the slurry concentration is controlled to 5% (mass ratio), ethylene glycol is added (the mass is 1% of the solids in the slurry), and then transferred to hydrothermal Hydrothermal reaction at 150℃ in the reactor for 5 hours; wash the product after the hydrothermal reaction to a pH value of 7, then centrifuge (3000 rpm, 10 minutes) and dry (100℃, 10 hours) to obtain the The gypsum whisker product prepared by using calcium carbide slag as a raw material of the invention.

[0061] The gypsum whiskers prepared in Example 3 had an aspect ratio of 100, a length of 500 microns, a width of 5 microns, and a purity of 98%.

PUM

Property	Measurement	Unit
Length	3.0 ~ 150.0	µm
Length	120.0	µm
Length	500.0	µm

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

save raw materials
low cost

Method utilizing calcium carbide slag as raw material to produce gypsum crystal whisker

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Abstract

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Description & Claims & Application Information

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