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A method for preparing rhombohedral ultrafine light calcium carbonate from Weibei Ordovician limestone

A technology of light calcium carbonate and limestone, applied in the fields of calcium carbonate/strontium/barium, chemical instruments and methods, calcium/strontium/barium compounds, etc.

Active Publication Date: 2018-05-11
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, the morphology of ultrafine light calcium carbonate produced in my country includes: spherical, needle-shaped, rod-shaped, flake-shaped, chain-shaped, cube-shaped, and amorphous, etc., but there are rare reports on the synthesis of ultra-fine calcium carbonate with other special shapes. In particular, there is no report on the preparation of rhombohedral superfine light calcium carbonate from Ordovician limestone in Weibei

Method used

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  • A method for preparing rhombohedral ultrafine light calcium carbonate from Weibei Ordovician limestone
  • A method for preparing rhombohedral ultrafine light calcium carbonate from Weibei Ordovician limestone
  • A method for preparing rhombohedral ultrafine light calcium carbonate from Weibei Ordovician limestone

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Experimental program
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Embodiment 1

[0037] In this example, the limestone used is the No. 1 limestone sample (thick layered, light gray, massive) of the Ordovician Majiagou Formation in Tongchuan. According to the operating requirements in the national standard GB / T3286-2012, the CaO, MgO, SiO 2 、Al 2 o 3 and Fe 2 o 3 The content of the limestone is determined, and the content of the main chemical components in the limestone is shown in Table 1 through analysis and determination.

[0038] Table 1 Contents of main chemical components in limestone

[0039]

[0040] The method for preparing superfine light calcium carbonate by adopting No. 1 limestone sample of Ordovician Majiagou Formation in Tongchuan comprises the following steps:

[0041] Step 1: The No. 1 limestone sample of the Ordovician Majiagou Formation in Tongchuan was crushed with a jaw crusher, and then cleaned, dried, and sieved to obtain raw material particles with a particle size of 1.6mm-2.0mm.

[0042] Step 2: put the above-mentioned raw ...

Embodiment 2

[0067] In this example, the limestone used is the No. 2 limestone sample (thick layered, light gray, massive) of the Ordovician Majiagou Formation in Tongchuan. According to the operating requirements in the national standard GB / T3286-2012, the CaO, MgO, SiO 2 、Al 2 o 3 and Fe 2 o 3 The content of the limestone is determined, and the content of the main chemical components in the limestone is shown in Table 4 through analysis and determination.

[0068] Table 4 Contents of main chemical components in limestone

[0069]

[0070] The method for preparing superfine light calcium carbonate by adopting the No. 2 limestone sample of the Ordovician Majiagou Formation in Tongchuan comprises the following steps:

[0071] Step 1: The No. 2 limestone sample of the Ordovician Majiagou Formation in Tongchuan is crushed with a jaw crusher, and then cleaned, dried, and sieved to obtain raw material particles with a particle size of 1.6mm-2.0mm.

[0072] Step 2: Put the above-mention...

Embodiment 3

[0094] In this embodiment, the limestone used is the No. 3 limestone sample (thick layer, light gray, massive) of the Ordovician Majiagou Formation in Tongchuan. According to the operation requirements in the national standard GB / T3286-2012, the CaO, MgO, SiO 2 、Al 2 o 3 and Fe 2 o 3 The content of the limestone is determined, and the content of the main chemical components in the limestone is shown in Table 6 through analysis and determination.

[0095] Table 6 Contents of main chemical components in limestone

[0096]

[0097] The method for preparing superfine light calcium carbonate by adopting the No. 3 limestone sample of the Ordovician Majiagou Formation in Tongchuan comprises the following steps:

[0098] Step 1: The No. 3 limestone sample of the Ordovician Majiagou Formation in Tongchuan was crushed with a jaw crusher, and then cleaned, dried, and sieved to obtain raw material particles with a particle size of 1.6mm-2.0mm.

[0099] Step 2: Put the above-menti...

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Abstract

The invention discloses a method for preparing rhomb-shaped superfine calcium hydrogen carbonate from Weibei ordovician limestone. The method comprises the following steps: crushing, cleaning, drying and sieving Weibei ordovician limestone, so as to obtain 1.6mm-2.0mm particles; calcining the particles at 1000 DEG C for 60 minutes, so as to obtain high-activity lime; mixing the high-activity lime with water of 90 DEG C, so as to prepare 5.6wt% of a lime emulsion; adding the lime emulsion into a container, putting the container into an ultrasonic vibrator, adding sodium laurate into the container, introducing CO2 gas, stirring, and reacting at 20 DEG C; when the pH is decreased to 7, stopping the introduction of CO2, turning off the ultrasonic vibrator, and continuing to stir for 20 minutes; and filtering, washing, and drying and grinding solute, so as to obtain the superfine calcium hydrogen carbonate. The method has the beneficial effects that the Weibei ordovician limestone is taken as the raw material, a carbonization method is adopted, a crystalline-form control agent, namely sodium laurate is added before carbonization, a gas distributor and an ultrasonic technique are adopted during the carbonization, and the rhomb-shaped superfine calcium hydrogen carbonate with excellent performance and high added value is prepared.

Description

technical field [0001] The invention relates to a method for preparing ultrafine light calcium carbonate, in particular to a method for preparing rhombohedral ultrafine light calcium carbonate by using Weibei Ordovician limestone, and belongs to the technical field of chemical industry. Background technique [0002] Ultrafine light calcium carbonate refers to the powder particles prepared by chemical methods with a particle size in which molecular clusters and macroscopic particles are mixed. The particle size of ultra-fine light calcium carbonate is between 0.02μm-0.1μm; non-toxic, odorless, low hygroscopicity, usually stored in a dry environment; sedimentation volume is 2.4mL / g-2.8mL / g, molecular weight is 100 、Specific surface area≥18m 2 / g, the melting point is 1339°C, and the relative density is 2.45-2.50; at room temperature (25°C), the solubility in water is very small, and the pH value is between 8.0-10.2; under normal pressure, when the temperature is ≤550°C, the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18
CPCC01F11/183C01P2002/72C01P2002/82C01P2004/03C01P2004/51C01P2004/64C01P2006/10C01P2006/12C01P2006/60
Inventor 杜美利樊锦文冯雨杨建利刘静李刚王博
Owner XIAN UNIV OF SCI & TECH
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