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Method of stabilizing silica-containing anionic microparticles in hard water

A technology of silica and colloidal silica, applied in the fields of silica, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as process performance changes and product quality

Active Publication Date: 2009-05-27
NALCO CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fluctuations in dilution water quality can also lead to variations in process performance and product quality due to variations in retention and discharge

Method used

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  • Method of stabilizing silica-containing anionic microparticles in hard water
  • Method of stabilizing silica-containing anionic microparticles in hard water
  • Method of stabilizing silica-containing anionic microparticles in hard water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0107] This example provides a recipe for preparing synthetic dilution water with varying hardness. Unless otherwise specified, this dilution water will be used in the following examples. From any standard chemical supplier, such as Aldrich and Fischer Scientific, reagent grade chemicals such as calcium chloride, magnesium sulfate and sodium bicarbonate can be obtained and can be used without further purification.

[0108] Use deionized water to prepare CaCl with a concentration of 0.377M 2 ·2H 2 O solution. Similarly, use deionized water to prepare MgSO 4 ·7H 2 O and NaHCO 3 The concentrated solution to produce the following molar concentrations of 0.187M and 0.550M, respectively. These "slurry" solutions are then used to prepare 1 liter of synthetic diluted hard water of the specified hardness.

[0109] Table 2

[0110]

[0111] The representative hardness reducing additives used in the following examples are listed in Table 3.

[0112] table 3

[0113] Representative additive...

Embodiment 2

[0117] The anionic particle product used in this example is a colloidal silica product, hereinafter referred to as CS-A, available from Nalco Company, Naperville, IL. The product is characterized by 11.7% silica, 10.48 product pH, 38.8% S value and 988m by weight 2 / g of surface area. Use synthetic dilution water with a hardness of 310 ppm based on calcium carbonate to dilute the product. The turbidity of dilution water with a hardness of 310 ppm is 0.500 NTU and the pH is 8.64. Place the water in a beaker with a magnetic stir bar. Add CS-A to the water, mix for 5-15 seconds, and then transfer to the sample holder of the Hach 2100AN Turbidimeter. Record the turbidity, NTU, at the indicated time interval. A Mettler Toledo MP220 pH meter with a standard composite electrode was used to measure the pH of the diluted solution. The pH and turbidity are measured at room temperature, that is, at 20°C. The results are summarized in Table 4.

[0118] Table 4

[0119]

[0120] As shown in ...

Embodiment 3

[0122] The anionic particle product used in this study is the product in Example 2, CS-A. Use synthetic dilution water with a hardness of 450 ppm based on calcium carbonate to dilute the product. The turbidity of dilution water with a hardness of 450 ppm is 0.112 NTU and the pH is 8.80. Place the water in a beaker with a magnetic stir bar. Add CS-A to the water, mix for 5-15 seconds, and then transfer to the sample holder of the Hach 2100AN Turbidimeter. Record the turbidity, NTU, at the indicated time interval. A Mettler Toledo MP220 pH meter with a standard composite electrode was used to measure the pH of the diluted solution. The pH and turbidity are measured at room temperature, that is, at 20°C. The results are summarized in Table 5.

[0123] table 5

[0124]

[0125] Table 5 shows that in the case of dilution with water having a hardness of 450 ppm as calcium carbonate, the instability starts at a lower dilution rate than when using 310 ppm hard water. When the dilution w...

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Abstract

A method of stabilizing silica-containing anionic microparticles upon mixing of the silica-containing anionic microparticles with hard water comprising adding one or more hardness-abating additives to the hard water prior to mixing of the hard water and the silica-containing anionic microparticles; or adding an effective stabilizing amount of one or more hardness-abating agents to the silica-containing anionic microparticles prior to mixing of the hard water with the silica-containing anionic microparticles and a stabilized composition comprising silica-containing anionic microparticles and an effective stabilizing amount of one or more hardness-abating additives.

Description

Technical field [0001] The present invention relates to the use of silica-containing anionic microparticles in papermaking. More specifically, the present invention relates to a method for preventing the gelation or precipitation of particles in hard water using a hardness-reducing additive, and a stabilized composition including anionic particles containing silica and a hardness-reducing additive. Background of the invention [0002] Silica-containing anionic particles are used as part of the retention and dewatering steps in the production of paper and cardboard products. In the papermaking process, before or after the addition point of high molecular weight flocculants, these particles are added to contain cellulose fibers, fillers, clays, dyes, starches, coagulants, and anionic garbage collectors. (ATC's) and other additives in the flowing slurry. Before adding the product including silica-containing anionic microparticles to the slurry, the product is diluted with process wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/143
CPCC01P2006/12C09C1/3072C09C1/309C01B33/1485D21H17/68D21H21/10C01B33/113C01B33/143
Inventor 布鲁斯·A·凯泽尔小雷蒙德·D·米勒琳达·S·斯特里斯科大卫·A·格雷坦
Owner NALCO CO
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