Spherical calcium carbonate and preparation method thereof

Abstract

The invention discloses a spherical calcium carbonate and a preparation method thereof. The preparation method comprises following steps: mixing quicklime with water according to a ratio, carrying outdigestion and aging, then sieving the solution to remove impurities, adding ethanol into the slurry, carrying out refining and regulating to obtain calcium hydroxide slurry; transferring the preparedslurry to a super gravity reactor, adding a crystal form controller, controlling the carbonization temperature, CO2 gas flow, and super gravity level to carry out countercurrent contact between the calcium hydroxide slurry and CO2 gas to trigger carbonization reactions; after carbonization, carrying out centrifugation, drying obtained precipitates, and grinding to obtain spherical calcium carbonate. Calcium hydroxide is taken as the raw material, alcohol and water are taken as the solvents, the cost is low, the spherical calcium carbonate is prepared in a super gravity field by a carbonization method, the microscopic mixing and mass transfer process are greatly enhanced, the carbonization time is short, the production efficiency is high, the particle size distribution range is narrow, theparticle size is small, the morphology is uniform, the dispersing property is good, and the spherical calcium carbonate is suitable for industrial application.

Description

technical field

[0001] The invention belongs to the field of inorganic non-metallic materials, and in particular relates to a spherical calcium carbonate and a preparation method thereof. Background technique

[0002] Calcium carbonate is one of the most abundant biominerals in nature. It has stable chemical properties, good biocompatibility, easy surface modification, various forms, and excellent non-toxic properties. It is a promising inorganic material. . It is widely used in many industries such as papermaking, paint, rubber, plastic, ink, cosmetics and medicine. Calcium carbonate with different shapes has different application fields. At present, the shapes of calcium carbonate that have been developed include spindle shape, cubic shape, fiber shape, spherical shape, chain shape, petal shape, sheet shape, mushroom cloud shape, needle shape, etc. Due to its isotropy, spherical calcium carbonate has excellent properties such as good dispersibility, smoothness and wear r...

Examples

Embodiment 1

[0031] A preparation method for spherical calcium carbonate, comprising the following steps:

[0032] S1. Digest quicklime and hot water at a mass ratio of 1:10, pass through a 200-mesh sieve to remove impurities, add ethanol solution with a volume fraction of 30% as a solvent, adjust and refine to obtain calcium hydroxide with a concentration of 70g / L slurry;

[0033] S2. drop the calcium hydroxide slurry configured in step S1 into the circulating feed liquid tank of the process device of the high gravity carbonization reaction process, add the 5wt% glutamic acid of the calcium hydroxide slurry configured in step S1 as crystal type control agent, set the carbonization temperature to 10°C, and the carbon dioxide gas flow to 0.6m 3 / h, the rotor speed of the supergravity reactor is set to 1000rpm, and the calcium hydroxide slurry and carbon dioxide gas are contacted in countercurrent to carry out the carbonization reaction; the digital display pH meter is used to track the who...

Embodiment 2

[0036]A preparation method for spherical calcium carbonate, comprising the following steps:

[0037] S1. Digest quicklime and hot water at a mass ratio of 1:5, pass through a 200-mesh sieve to remove impurities, add ethanol solution with a volume fraction of 80% as a solvent, adjust and refine to obtain calcium hydroxide with a concentration of 115g / L slurry;

[0038] S2. drop the calcium hydroxide slurry configured by step S1 into the circulating feed liquid kettle of the processing device of the high gravity carbonization reaction process, add the aspartic acid of 1wt% of the calcium hydroxide slurry configured by step S1 as Crystal form control agent, set the carbonization temperature to 40°C and the flow rate of carbon dioxide to 0.2m 3 / h, the rotor speed of the supergravity reactor is set to 1800rpm, let the calcium hydroxide slurry contact with the carbon dioxide gas countercurrently, and carry out the carbonization reaction; use the digital display pH meter to track t...

Embodiment 3

[0041] A preparation method for spherical calcium carbonate, comprising the following steps:

[0042] S1. Digest quicklime and hot water at a mass ratio of 1:8, pass through a 200-mesh sieve to remove impurities, add ethanol solution with a volume fraction of 60% as a solvent, adjust and refine to obtain calcium hydroxide with a concentration of 105g / L slurry;

[0043] S2. drop the calcium hydroxide slurry configured in step S1 into the circulating feed liquid tank of the process device of the high gravity carbonization reaction process, add the 3wt% glutamic acid of the calcium hydroxide slurry configured in step S1 as crystal type control agent, set the carbonization temperature to 30°C, and the carbon dioxide gas flow to 0.5m 3 / h, the rotor speed of the supergravity reactor is set to 1600rpm, and the calcium hydroxide slurry and carbon dioxide gas are contacted in countercurrent to carry out the carbonization reaction; the digital display pH meter is used to track the who...

technical field

[0001] The invention belongs to the field of inorganic non-metallic materials, and in particular relates to a spherical calcium carbonate and a preparation method thereof. Background technique

[0002] Calcium carbonate is one of the most abundant biominerals in nature. It has stable chemical properties, good biocompatibility, easy surface modification, various forms, and excellent non-toxic properties. It is a promising inorganic material. . It is widely used in many industries such as papermaking, paint, rubber, plastic, ink, cosmetics and medicine. Calcium carbonate with different shapes has different application fields. At present, the shapes of calcium carbonate that have been developed include spindle shape, cubic shape, fiber shape, spherical shape, chain shape, petal shape, sheet shape, mushroom cloud shape, needle shape, etc. Due to its isotropy, spherical calcium carbonate has excellent properties such as good dispersibility, smoothness and wear r...

Examples

Embodiment 1

[0031] A preparation method for spherical calcium carbonate, comprising the following steps:

[0032] S1. Digest quicklime and hot water at a mass ratio of 1:10, pass through a 200-mesh sieve to remove impurities, add ethanol solution with a volume fraction of 30% as a solvent, adjust and refine to obtain calcium hydroxide with a concentration of 70g / L slurry;

[0033] S2. drop the calcium hydroxide slurry configured in step S1 into the circulating feed liquid tank of the process device of the high gravity carbonization reaction process, add the 5wt% glutamic acid of the calcium hydroxide slurry configured in step S1 as crystal type control agent, set the carbonization temperature to 10°C, and the carbon dioxide gas flow to 0.6m 3 / h, the rotor speed of the supergravity reactor is set to 1000rpm, and the calcium hydroxide slurry and carbon dioxide gas are contacted in countercurrent to carry out the carbonization reaction; the digital display pH meter is used to track the who...

Embodiment 2

[0036]A preparation method for spherical calcium carbonate, comprising the following steps:

[0037] S1. Digest quicklime and hot water at a mass ratio of 1:5, pass through a 200-mesh sieve to remove impurities, add ethanol solution with a volume fraction of 80% as a solvent, adjust and refine to obtain calcium hydroxide with a concentration of 115g / L slurry;

[0038] S2. drop the calcium hydroxide slurry configured by step S1 into the circulating feed liquid kettle of the processing device of the high gravity carbonization reaction process, add the aspartic acid of 1wt% of the calcium hydroxide slurry configured by step S1 as Crystal form control agent, set the carbonization temperature to 40°C and the flow rate of carbon dioxide to 0.2m 3 / h, the rotor speed of the supergravity reactor is set to 1800rpm, let the calcium hydroxide slurry contact with the carbon dioxide gas countercurrently, and carry out the carbonization reaction; use the digital display pH meter to track t...

Embodiment 3

[0041] A preparation method for spherical calcium carbonate, comprising the following steps:

[0042] S1. Digest quicklime and hot water at a mass ratio of 1:8, pass through a 200-mesh sieve to remove impurities, add ethanol solution with a volume fraction of 60% as a solvent, adjust and refine to obtain calcium hydroxide with a concentration of 105g / L slurry;

[0043] S2. drop the calcium hydroxide slurry configured in step S1 into the circulating feed liquid tank of the process device of the high gravity carbonization reaction process, add the 3wt% glutamic acid of the calcium hydroxide slurry configured in step S1 as crystal type control agent, set the carbonization temperature to 30°C, and the carbon dioxide gas flow to 0.5m 3 / h, the rotor speed of the supergravity reactor is set to 1600rpm, and the calcium hydroxide slurry and carbon dioxide gas are contacted in countercurrent to carry out the carbonization reaction; the digital display pH meter is used to track the who...

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