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Preparation method of wormlike precipitated calcium carbonate

A precipitated calcium carbonate, worm-like technology, applied in the direction of calcium carbonate/strontium/barium, chemical instruments and methods, calcium/strontium/barium compounds, etc., to achieve the effect of high specific surface area, high purity and low price

Active Publication Date: 2021-03-05
ANHUI PROVINCE XUNCHENG CITY HUANA NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the morphology prepared by this method is calcite chain, not worm-like calcium carbonate

Method used

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  • Preparation method of wormlike precipitated calcium carbonate
  • Preparation method of wormlike precipitated calcium carbonate
  • Preparation method of wormlike precipitated calcium carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A preparation method for worm-like precipitated calcium carbonate, comprising the steps of:

[0033] (1) After the quicklime is digested and reacted, the obtained milk of lime is adjusted to a specific gravity of 1.050 to obtain a calcium hydroxide suspension;

[0034] (2) Take 15 kg of calcium hydroxide suspension, add 0.1 mol magnesium chloride and 0.2 mol strontium chloride to it, make a solution with a cation molar concentration of 1 mol / L as a crystal form control agent, stir and mix evenly, and then add the carbonization tower, Control the stirring rate to 20Hz, the carbonization start temperature is 21.0°C, pass a mixed gas of carbon dioxide with a concentration of 30% into the suspension, and the flow rate is 2.0m 3 / h until the pH drops to 9.0 to stop carbonation and obtain a PCC suspension;

[0035] (3) Add a phosphoric acid solution with a mass concentration of 5% to the PCC suspension at a rate of 220ml / min until the pH drops to 7.0, terminate the reaction,...

Embodiment 2

[0038] A preparation method for worm-like precipitated calcium carbonate, comprising the steps of:

[0039] (1) After the quicklime is digested and reacted, the obtained milk of lime is adjusted to a specific gravity of 1.060 to obtain a calcium hydroxide suspension;

[0040](2) Take 15 kg of calcium hydroxide suspension, add 0.3 mol of magnesium oxide to it, make a solution with a concentration of 3 mol / L as a crystal form control agent, stir and mix evenly, then add to the carbonization tower, control the stirring rate to 20 Hz, and carbonize The initial temperature is 23.0°C, and a mixed gas of carbon dioxide with a concentration of 31% is introduced into the suspension with a flow rate of 2.0m 3 / h until the pH drops to 9.0 to stop carbonation and obtain a PCC suspension;

[0041] (3) Add a phosphoric acid solution with a mass concentration of 5% to the PCC suspension at a rate of 250ml / min until the pH drops to 7.0, terminate the reaction, let it stand for 20 minutes, an...

Embodiment 3

[0044] A preparation method for worm-like precipitated calcium carbonate, comprising the steps of:

[0045] (1) After the quicklime is digested, the milk of lime obtained is adjusted to a specific gravity of 1.065 to obtain a calcium hydroxide suspension;

[0046] (2) Take 15kg of calcium hydroxide suspension, add 0.4mol magnesium bicarbonate and 0.1mol barium chloride to it, make a solution with a cation concentration of 5mol / L as a crystal form control agent, stir and mix evenly, and then add to the carbonization tower , the stirring rate is controlled at 20Hz, the carbonization start temperature is 24°C, and a mixed gas of carbon dioxide with a concentration of 33% is passed into the suspension with a flow rate of 2.2m 3 / h until the pH drops to 9.0 to stop carbonation and obtain a PCC suspension;

[0047] (3) Add a phosphoric acid solution with a mass concentration of 5% to the PCC suspension at a rate of 280ml / min until the pH drops to 7.0, stop the reaction, let it stan...

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Abstract

The invention discloses a preparation method of wormlike precipitated calcium carbonate. The preparation method comprises the following steps: carrying out a digestion reaction on quick lime, and regulating specific gravity to obtain a calcium hydroxide suspension; adding a salt of a magnesium, strontium or barium element or a compound thereof as a crystal form control agent into the suspension, conducting uniform stirring and mixing, adding the formed mixture into a carbonization tower, introducing a mixed gas containing carbon dioxide for a calcium carbonate reaction, and stopping carbonation until a pH value is reduced to 9.0 to obtain a PCC suspension; and slowly adding a phosphoric acid solution into the PCC suspension until the pH value is reduced to 7.0, stopping the reaction, conducting standing, and carrying out filter pressing, drying, crushing and grading on the suspension according to a conventional method to obtain wormlike precipitated calcium carbonate powder. Accordingto the method, the salt of the magnesium, strontium or barium element or a compound thereof is added as the crystal form control agent, the final end point of the reaction is controlled, and the finalpH value is adjusted by phosphoric acid, so the obtained wormlike precipitated calcium carbonate has the advantages of high purity, high whiteness, high specific surface area and the like.

Description

technical field [0001] The invention belongs to the technical field of inorganic materials, in particular to a preparation method of worm-like precipitated calcium carbonate. Background technique [0002] Calcium carbonate, as a green and environmentally friendly inorganic material, has a wide range of uses. Due to the low cost of obtaining calcium carbonate raw materials, the production cost and related technologies are relatively mature. Secondly, calcium carbonate as a filler can improve the mechanical properties, appearance and structure adjustment of products, and greatly reduce the cost of products. It can be used in rubber, plastic, papermaking , ink, plastic and other fields. Calcium carbonate is used in coatings, sealants, etc. Well-dispersed calcium carbonate particles can form a good space site structure and improve the anti-sagging performance and mechanical properties of products, which is of great significance in automotive coatings and construction adhesives....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
CPCC01F11/182C01P2004/03C01P2006/12C01P2006/80C01P2006/60
Inventor 李仁才朱勇文庆福杨爱梅廖海才马建堂
Owner ANHUI PROVINCE XUNCHENG CITY HUANA NEW MATERIAL TECH CO LTD
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