Modified calcium sulphate anticorrosive pigment as well as preparation method and application thereof

Abstract

The invention discloses a modified calcium sulphate anticorrosive pigment as well as a preparation method and an application thereof. The preparation method comprises the following steps: preparing calcium sulphate extracted from industrial by-product gypsum into a suspension with a certain solid content, adding a modifier according to a certain mass percent, and then placing the modifier in a ball mill and uniformly mixing and grinding; drying the ground mixture for 3-6 hours at 80-150 DEG C, cooling the mixture and then grinding the mixture into a powder and crushing, wherein preferably, aminosilane-modified gas-phase silica is added during the grinding and crushing process. The calcium sulphate anticorrosive pigment disclosed by the invention is capable of effectively solving the pressure brought to an environment by the industrial by-product gypsum, and capable of improving the industrial by-product gypsum, wear resistance and corrosion resistance of a coating film in case of being mixed and used with other anticorrosive pigments; the pigment is good in dispersibility in resin, simple in production process, low in production cost, and capable of bringing good social and economic benefits.

Description

technical field

[0001] The invention relates to a modified calcium sulfate anticorrosion pigment, a preparation method and application thereof. technical background

[0002] According to statistics, in 2013, my country's phosphogypsum emissions were about 70 million tons, and desulfurization gypsum emissions were about 67 million tons. The emissions of other titanium gypsum, citrate gypsum, and fluorogypsum were also quite large. Such a large amount of industrial by-product gypsum has caused huge environmental and economic pressures on various production enterprises.

[0003] In recent years, calcium sulfate extracted from desulfurization gypsum, phosphogypsum and other industrial by-product gypsum waste slag or metal smelting waste slag is a new type of inorganic material, which has many excellent properties such as high temperature resistance, acid and alkali corrosion resistance, low wear, and stable size. Physical and chemical properties, but due to the limitations of a...

Examples

Embodiment 1

[0054] Phosphogypsum extracted from phosphogypsum has a purity of 95%, a whiteness of 95% ISO, a particle size of 150 μm, and a density of 2.5 g / cm 3 , 50g of calcium sulfate with a refractive index of 1.6, slowly added to the aqueous dispersion containing 2% silane coupling agent KH5501.0g under stirring, and the solid content of the suspension was adjusted to 60%, adjusted with 0.5mol / L HCl solution The pH of the suspension is between 5 and 7, stirred at a speed of 4000r / min for 20 minutes and then transferred to a small ball mill; the grinding medium is ceramic beads with a diameter of 1cm, 2cm, and 3cm at a ratio of 1:1:1. 3:1, adjust the voltage of the ball mill to 150V, and grind the mixture for 180 minutes; transfer the ground suspension and ceramic beads to a blast drying oven for drying at 105°C for 5 hours; finally put the dried mixture into the ball mill again Grind into powder. The whiteness of the powder is 95% ISO.

Embodiment 2

[0056] The purity extracted from desulfurized gypsum is 99%, the whiteness is 95% ISO, the particle size is 200μm, and the density is 2.6g / cm 3 , 50g of calcium sulfate with a refractive index of 1.7 was slowly added under stirring to the aqueous dispersion containing 1% silane coupling agent KH5700.5g and 2% titanate coupling agent 1020.5g, and the solid content of the suspension was adjusted to 65%, use 0.5mol / L HCl solution to adjust the pH of the suspension between 5 and 7, stir at a speed of 3000r / min for 15min and then transfer to a ball mill; the grinding medium is 1:1:1 and the diameter is 1cm , 2cm, 3cm ceramic beads, the ratio of ball to material is 5:1, the voltage of the ball mill is adjusted to 200V, and the mixture is ground for 150min; the suspension and ceramic beads after grinding are transferred to a blast drying oven for drying, and dried at 105°C for 4 hours ; Finally, put the dried mixture into the ball mill again and grind it into powder. Whiteness is 95...

Embodiment 3

[0058] The purity extracted from desulfurized gypsum is 99%, the whiteness is 96% ISO, the particle size is 200μm, and the density is 2.6g / cm 3 , 50g of calcium sulfate with a refractive index of 1.7, slowly added to the water dispersion containing 2% silane coupling agent DL6021.5g under stirring, adjusted the solid content of the suspension to 50%, adjusted with 0.5mol / L HCl solution The pH of the suspension is between 5 and 7, stirred at a speed of 4000r / min for 20 minutes and then transferred to a ball mill; the grinding medium is ceramic beads with a diameter of 1cm, 2cm, and 3cm at a ratio of 1:1:1, and the ball-to-material ratio is 3 : 1. Adjust the voltage of the ball mill to 150V, and grind the mixture for 180 minutes; transfer the ground suspension and ceramic beads to a blast drying oven for drying at 105°C for 6 hours; finally put the dried mixture into the ball mill again Grind into powder. The whiteness of the powder is 96% ISO.

technical field

[0001] The invention relates to a modified calcium sulfate anticorrosion pigment, a preparation method and application thereof. technical background

[0002] According to statistics, in 2013, my country's phosphogypsum emissions were about 70 million tons, and desulfurization gypsum emissions were about 67 million tons. The emissions of other titanium gypsum, citrate gypsum, and fluorogypsum were also quite large. Such a large amount of industrial by-product gypsum has caused huge environmental and economic pressures on various production enterprises.

[0003] In recent years, calcium sulfate extracted from desulfurization gypsum, phosphogypsum and other industrial by-product gypsum waste slag or metal smelting waste slag is a new type of inorganic material, which has many excellent properties such as high temperature resistance, acid and alkali corrosion resistance, low wear, and stable size. Physical and chemical properties, but due to the limitations of a...

Examples

Embodiment 1

[0054] Phosphogypsum extracted from phosphogypsum has a purity of 95%, a whiteness of 95% ISO, a particle size of 150 μm, and a density of 2.5 g / cm 3 , 50g of calcium sulfate with a refractive index of 1.6, slowly added to the aqueous dispersion containing 2% silane coupling agent KH5501.0g under stirring, and the solid content of the suspension was adjusted to 60%, adjusted with 0.5mol / L HCl solution The pH of the suspension is between 5 and 7, stirred at a speed of 4000r / min for 20 minutes and then transferred to a small ball mill; the grinding medium is ceramic beads with a diameter of 1cm, 2cm, and 3cm at a ratio of 1:1:1. 3:1, adjust the voltage of the ball mill to 150V, and grind the mixture for 180 minutes; transfer the ground suspension and ceramic beads to a blast drying oven for drying at 105°C for 5 hours; finally put the dried mixture into the ball mill again Grind into powder. The whiteness of the powder is 95% ISO.

Embodiment 2

[0056] The purity extracted from desulfurized gypsum is 99%, the whiteness is 95% ISO, the particle size is 200μm, and the density is 2.6g / cm 3 , 50g of calcium sulfate with a refractive index of 1.7 was slowly added under stirring to the aqueous dispersion containing 1% silane coupling agent KH5700.5g and 2% titanate coupling agent 1020.5g, and the solid content of the suspension was adjusted to 65%, use 0.5mol / L HCl solution to adjust the pH of the suspension between 5 and 7, stir at a speed of 3000r / min for 15min and then transfer to a ball mill; the grinding medium is 1:1:1 and the diameter is 1cm , 2cm, 3cm ceramic beads, the ratio of ball to material is 5:1, the voltage of the ball mill is adjusted to 200V, and the mixture is ground for 150min; the suspension and ceramic beads after grinding are transferred to a blast drying oven for drying, and dried at 105°C for 4 hours ; Finally, put the dried mixture into the ball mill again and grind it into powder. Whiteness is 95...

Embodiment 3

[0058] The purity extracted from desulfurized gypsum is 99%, the whiteness is 96% ISO, the particle size is 200μm, and the density is 2.6g / cm 3 , 50g of calcium sulfate with a refractive index of 1.7, slowly added to the water dispersion containing 2% silane coupling agent DL6021.5g under stirring, adjusted the solid content of the suspension to 50%, adjusted with 0.5mol / L HCl solution The pH of the suspension is between 5 and 7, stirred at a speed of 4000r / min for 20 minutes and then transferred to a ball mill; the grinding medium is ceramic beads with a diameter of 1cm, 2cm, and 3cm at a ratio of 1:1:1, and the ball-to-material ratio is 3 : 1. Adjust the voltage of the ball mill to 150V, and grind the mixture for 180 minutes; transfer the ground suspension and ceramic beads to a blast drying oven for drying at 105°C for 6 hours; finally put the dried mixture into the ball mill again Grind into powder. The whiteness of the powder is 96% ISO.

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