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Preparation method of lamellar crystal light calcium carbonate for paper making coating

A technology of light calcium carbonate and flaky crystals, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of difficult preparation and few breakthroughs by researchers, and achieve the effect of simple preparation and operation and easy industrialization

Inactive Publication Date: 2005-08-24
TIANJIN CHEM RES & DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the special calcium carbonate for papermaking with huge market potential, flaky crystal calcium carbonate with submicron particle size is a better variety, but because the preparation is relatively difficult, researchers have rarely made breakthroughs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh 11g calcium chloride into a 6% aqueous solution, then weigh 10.4g potassium carbonate into a 10% solution, adjust the temperature to 15℃, slowly add the potassium carbonate solution to the calcium chloride solution to prepare 7.5g calcium carbonate seeds , Add the prepared seed crystal and its mother liquor to 2716mL of 5% lime milk, adjust the temperature to 12℃, and control CO 2 The flow rate is 0.38m 3 / h, the carbonization reaction is carried out. After the carbonization reaches the end point, the product is filtered and dried to obtain a finished product. The finished product was observed with a transmission electron microscope, the average particle size of the crystal was 0.4μm, and the crystal shape was flake.

Embodiment 2

[0022] Weigh 120g calcium nitrate to make a 10% aqueous solution, then weigh 60g ammonium bicarbonate to make a 15% solution, adjust the temperature to 25℃, slowly add the calcium nitrate solution to the ammonium bicarbonate solution to prepare 50g calcium carbonate seed crystals. The prepared seed crystal and its mother liquor are added to 934mL of 12% lime milk, and the temperature is adjusted to 30℃ to control CO 2 The flow rate is 0.13m 3 / h, the carbonization reaction is carried out. After the carbonization reaches the end point, the product is filtered and dried to obtain a finished product. The finished product was observed with a transmission electron microscope, the average grain size of the crystal was 0.6μm, and the crystal shape was flake.

Embodiment 3

[0024] Weigh 105.6g calcium acetate and 95.6g calcium chloride each to make a 20% aqueous solution, then weigh 80g sodium bicarbonate and 30g potassium bicarbonate each to make a 30% solution, adjust the temperature to 30℃, and chlorinate the calcium acetate and The calcium mixed solution was slowly added to the sodium bicarbonate and potassium bicarbonate mixed solution to prepare 125g of calcium carbonate seed crystals. The prepared seed crystals and the mother liquor were added to 875mL of 8% lime milk, and the temperature was adjusted to 45°C to control CO 2 The flow rate is 0.27m 3 / h, the carbonization reaction is carried out. After the carbonization reaches the end point, the product is filtered and dried to obtain a finished product. The finished product was observed with a transmission electron microscope, the average grain size of the crystal was 0.5 μm, and the crystal shape was flake.

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Abstract

A process for preparing the light-weight flaky calcium carbonate used for coating on paper includes such steps as preparing the solution of soluble Ca salt, preparing the solution of soluble carbonate, slowly adding one to another, reaction to obtain crystal seeds of calcium carbonate, adding them along with mother liquid to refined lime milk, stirring, filling CO2, carbonizing, filtering and drying.

Description

Technical field: [0001] The invention belongs to the technical field of inorganic synthesis, and furthermore is a preparation method of flaky crystal light calcium carbonate for papermaking coating. Background technique: [0002] Calcium carbonate is a very large amount of inorganic filler, widely used in papermaking, plastics, rubber, ink, medicine and other industries. At present, there are more than 300 production plants nationwide, with an annual production capacity of 5.3 million tons and actual output of about 4.2 million tons. However, most of them are ordinary light calcium carbonate and low-grade heavy calcium carbonate. They can only be used as general fillers in the plastic, rubber and paper industries, and the added value of the product is not high. In recent years, with the rise of nano-materials, the research of nano-calcium carbonate is also very active and has achieved good results. As a special calcium carbonate for papermaking with huge market potential, flaky c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
Inventor 蒋凌云章苏张永惠杨振祥
Owner TIANJIN CHEM RES & DESIGN INST
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