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Precipitated calcium carbonate from pulp grinding waste with improved brightness, process for its manufacture and use thereof

A waste, whiteness technology, applied in the field of mineral pigments, can solve the problems that do not involve the properties of precipitated calcium carbonate

Active Publication Date: 2015-08-19
OMYA INT AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the focus of this invention is on capturing carbon dioxide, this document is silent on the properties of the resulting precipitated calcium carbonate

Method used

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  • Precipitated calcium carbonate from pulp grinding waste with improved brightness, process for its manufacture and use thereof
  • Precipitated calcium carbonate from pulp grinding waste with improved brightness, process for its manufacture and use thereof
  • Precipitated calcium carbonate from pulp grinding waste with improved brightness, process for its manufacture and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0081] The following examples are intended to illustrate specific embodiments of the invention and are not to be construed as limiting the invention in any way.

[0082] For the purposes of the present invention, the parameter d 50 The value of (%) is obtained from the particle size measurement values ​​of which 50% by mass of the particles each have a diameter smaller than or equal to the value.

[0083]The term w / w refers to the mass fraction of the material and is defined as the material mass m mat Specific mass of the total mixture m tot score.

[0084] Measurement methods:

[0085] Suspension pH measurement

[0086] The pH of the suspension was measured at 25°C using a Mettler Toledo Seven Easy pH meter with a Mettler Toledo Expert Pro pH electrode measurement.

[0087] The instrument was first calibrated at three points (according to the segment method) using commercially available buffer solutions (from Aldrich) with pH values ​​of 4, 7 and 10 at 20°C.

[0088...

Embodiment 2

[0118] Example 2 - Example of the invention

[0119] This example relates to the inventive process for the manufacture of calcium carbonate products starting from calcium carbonate obtained from pulp grinding waste, wherein the calcium carbonate obtained from pulp grinding waste is calcined to obtain pulp grinding waste lime (CaO), slaked, and subsequently The resulting milk of lime is carbonated and processed to obtain a specific pulp grinding waste precipitated calcium carbonate (PCC) characterized by ultrafine discrete particles. The resulting material is then subjected to a carbonation reaction with an aqueous slurry of high-purity calcium hydroxide (the so-called "milk of lime").

Embodiment 1

[0120] The low-purity spent CaCO of embodiment 1 3(which is typically discharged from the chemical recovery process of kraft pulp milling of Klabin Papeís S.A., Telemaco Borba Mill) is calcined in a rotary kiln at a temperature in the range of 900°C to 1300°C and pre-crushed on a hammer mill to obtain Low-purity pulp grinding waste CaO. 200 kg of this spent CaO (quicklime) were added to 1800 liters of 70°C tap water in a stirred slaking reactor. The quicklime was slaked for 30 minutes under continuous stirring, and the resulting slurry ("milk of spent lime") was recovered in the form of an aqueous suspension of calcium hydroxide. 1800 liters of this milk of spent lime were added to the carbonator, and the temperature of the milk of spent lime was adjusted to 20°C. Before carbonation, 1.3 liters of a 70% w / w aqueous sugar alcohol solution (Sorbitol 80%, Brenntag CEE GmbH) was added.

[0121] Carbonation was carried out in the same manner as described in Example 1. The carbo...

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Abstract

The present invention relates to a process for producing a precipitated divalent metal ion carbonate product having improved whiteness from divalent metal ion carbonate recovered from waste materials, the process comprising the following Steps: providing low-purity divalent metal ion carbonate material, the divalent metal ion carbonate material is recovered from waste; calcining the divalent metal ion carbonate material to obtain divalent metal ion oxide; aging the divalent metal ion carbonate material; oxidizing the valent metal ion to obtain an aqueous suspension of divalent metal ion hydroxide; carbonating the aqueous suspension of divalent metal ion hydroxide with a compound containing carbon dioxide to obtain fine precipitated divalent metal ion carbonate particles ; post-processing the fine precipitated divalent metal ion carbonate particles to obtain fine discrete precipitated divalent metal ion carbonate particles; adding the fine discrete precipitated divalent metal ion carbonate particles to high purity divalent metal ion metal ion hydroxide in an aqueous suspension of divalent metal ion hydroxide obtained to obtain a resulting reaction mixture; and carbonating the resulting reaction mixture to obtain a precipitated divalent metal ion carbonate product with improved whiteness .

Description

technical field [0001] The present invention relates to a process for the manufacture of precipitated calcium carbonate (PCC) from waste lime, mineral pigments of the precipitated calcium carbonate species (PCC) obtained by this process and the use of these mineral pigments. Background technique [0002] Calcium carbonate is widely used in the paper industry as a filler component in paper. It is a low-cost, high-brightness filler used to increase paper whiteness and opacity. The use of calcium carbonate has increased significantly over the past few decades as paper mills have switched from acidic to alkaline papermaking. Both natural and synthetic calcium carbonate are used in the paper industry. Natural carbonates, such as limestone, marble or chalk, are ground to a smaller particle size before they are used in paper, while synthetic calcium carbonate is produced by a precipitation reaction and is therefore called precipitated calcium carbonate (PCC). [0003] Usually, P...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/24C01F11/18C01B32/60
CPCB82Y30/00C01B32/60C01F5/24C01F11/18C01F11/181C01F11/185C01P2004/03C01P2004/52C01P2004/61C01P2004/62C01P2004/64C01P2004/84C01P2006/12C01P2006/22C01P2006/60C08K2003/265C09C1/021C09D7/61C09D7/67C09D7/68
Inventor M·波尔T·施莫尔兹
Owner OMYA INT AG
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