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Bentonite slurry

A technology of slurry and bentonite, which is applied in the field of phyllosilicate material slurry, can solve problems such as water filtration performance and retention rate performance that are not mentioned

Inactive Publication Date: 2007-07-18
MEADWESTVACO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While the concentrate itself is mentioned, there is no mention of its enhanced drainage and retention properties compared to common bentonite systems starting from a dry powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031]A series of bentonite slurries were prepared with varying amounts of bentonite and rosin blends. The rosin blend was STAFOR-50. The purpose of this example was to determine if the amount of bentonite solids was increased in the slurry and still remained pumpable, ie had a sufficiently low viscosity. The slurries evaluated are shown in Table 1.

[0032] Table 1

[0033] test

[0034] Viscosity data from the above test, (Brookfield RV, spindle 3, speed 6)

[0035] test

[0036] 3

[0037] From the above data it appears that increasing the amount of STAFOR-50 in the slurry resulted in increased solids and better time-stability. In the slurry, there was little change from 1 hour to after 24 hours. Precipitation was minimal after 48 hours.

Embodiment 2

[0039] Slurries made from rosin / fatty acid derivative blends

[0040] test

[0041] Viscosity data for 24 hours of the above test (Brookfield RV, spindle 4, speed as stated)

[0042] test

[0043] The significance of the above data is that the blend of tall oil derived fat and rosin compounds eliminates the need to add electrolytes. Also, the final compound, 61-1, has a less shear rate dependent rheology since the viscosity measured at 60 rpm is almost the same as the viscosity measured at 6 rpm. The product is easy to handle, flowable and stable.

Embodiment 3

[0044] The slurry that embodiment 3 makes (Lab-Cook) STAFOR-50 makes with laboratory

[0045] The rosin adduct was saponified at 80° C. in the laboratory according to conventional procedures, to which was added 2.8% of a fatty acid-derived dispersing aid, MeadWestvaco PC-SRK, based on bentonite solids. Bentonite was added to the solution at elevated temperature to see if this produced swelling. The slurry had a final total solids of 40% and a final viscosity of 4100 after 1 hour, similar to Run 4 in Example 1 above. After 4 days, the slurry was stable and still flowable when agitated on a stir plate of.

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Abstract

There is provided an alkaline earth phyllosilicate material-containing slurry. It has been found the slurries of the present invention may be made at concentrations of up to 75% solids and remain pumpable. Broadly speaking, the slurry includes an alkaline earth phyllosilicate material and a polyfunctional compound and the remainder being water. The alkaline earth phyllosilicate material-containing slurry is preferably a pre-activated bentonite which is essentially semi-swollen upon addition to the slurry, and the polyfunctional compound is preferably an essentially non-monomeric, tall-oil derivative or distillate and the remainder being water. Other polyfunctional compounds include lignin, pitch, and liginosulfonate. The slurry does not requiring the addition of electrolyte. The properties of the slurry are such that the slurry contains between 5% and 75% total solid material in a pumpable form. There is also provided processes for making paper and for dewatering sludge using the slurry of this invention.

Description

[0001] Cross References to Related Applications [0002] This application is based on U.S. Provisional Application No. 60 / 749,237 filed December 9, 2005 and claims priority to that earlier application under 35 U.S.C. §119(e), the contents of which are incorporated herein by reference . technical field [0003] The present invention generally relates to phyllosilicate material slurries and methods of using the slurries. More specifically, the present invention relates to bentonite slurries with more solids and stability. Background technique [0004] One use of bentonite slurries is in the wet end of a paper machine as an adjunct to nonionic and cationic flocculants to enhance water removal and particulate retention during papermaking. Additionally, mineral fibers have long been added to pulp slurries to improve color, opacity, printability, and other properties. One such method is disclosed in US Patent No. 3,052,595, wherein mineral fillers such as kaolin, titanium diox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28C7/04B28C1/04
CPCD21H17/68D21H21/52D21H17/62
Inventor M·T·普洛夫L·W·霍斯
Owner MEADWESTVACO CORP