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Integrated process for simultaneous beneficiation, leaching, and dewatering of kaolin clay suspension

A kaolin, suspension technology, applied in selective deposition, clay products, solid separation, etc., to reduce environmental hazards, reduce costs, and save materials

Inactive Publication Date: 2004-12-15
IMERYS PIGMENTS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All these constraints add to the cost of the chosen method

Method used

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  • Integrated process for simultaneous beneficiation, leaching, and dewatering of kaolin clay suspension
  • Integrated process for simultaneous beneficiation, leaching, and dewatering of kaolin clay suspension
  • Integrated process for simultaneous beneficiation, leaching, and dewatering of kaolin clay suspension

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Example 1 Milky oxidized (milky white) natural mineral

[0062]

[0063] natural mine

thing

Minute

class

control

product

(B-

2)

(C-

2)

(D)

(I)

control

product

W / Mag

brightness

(GE)

80.66

88.53

88.25

88.86

88.36

91.54

92.19

L

95.07

96.51

96.36

96.29

96.24

96.95

97.2

a

-0.31

-0.18

-0.08

0.02

-0.07

-0.01

0.01

b

7.73

3.86

3.89

3.34

3.65

2.3

2.1

TiO2

(weight%)

2.645

0.998

1.017

1.27

1.233

0.866

0.682

Fe 2 o 3

(weight%)

1.024

0.941

0.991

0.9...

Embodiment 2

[0066] Example 2 Coarse grained oxidized (milky white with pink) natural mineral

[0067]

[0068]

[0069] Comparison product

A

D

B

C

H

Brightness (GE)

91.01

88.18

89.17

88.73

89.2

90.18

b

2.41

3.82

3.42

3.51

3.32

2.67

TiO2(wt%)

0.544

1.08

0.638

0.978

0.649

0.706

Fe 2 o 3 (weight%)

0.546

0.54

0.521

0.562

0.539

0.614

Conductivity

302us

230us

230us

276us

394us

440us

Brookfield viscosity 70%

Solid particles

@20rpm

395

275

250

390

385

Hershey's viscosity 70%

solid particles, rpm

@18dyne

(4400, rpm)

630

1180

1200

660

940

[0070] In Example 2, a pinkish milky white coarse-grained oxidized natural kaolin...

Embodiment 3

[0072] Example 3 Fine-grained gray natural mineral

[0073]

[0074]

[0075] to stir

grading

A

B

grading

G

I

brightness

(GE)

83.21

84.03

87.84

90.58

84.31

90.04

88.74

L

93.48

93.78

95.43

96.39

93.83

95.91

95.36

a

-0.17

-0.01

-0.23

-0.14

-0.08

-0.17

-0.03

b

3.61

3.4

2.86

2.16

3.27

1.86

2.07

TiO2 (weight

%)

2.801

2.543

1.848

0.807

2.519

0.802

0.89

Fe2O3 (weight

%)

0.982

0.94

0.944

0.955

0.932

0.975

0.981

Conductivity

297us

400us

Wt%<2um

95.7

98.7

98.9

98.8

98.9

Wt%<0.5um

79.4

...

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PUM

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Abstract

The present invention provides an improved method of beneficiating and dewatering kaolin clays. The product of the improved process is a brightened, dewatered kaolin, suitable for use in pigments and paper coating compositions. The improved beneficiation process provides refined kaolin for pigments and other purposes of the same or better quality as prior art processes, but with the use of fewer steps and materials, at significant cost and environmental savings.

Description

field of invention [0001] The present invention provides an improved process for the beneficiation and dewatering of kaolin clay. The product obtained by the improved process is a bright anhydrous kaolin suitable for use in pigment and paper coating compositions. The improved process is the result of a partial modification of the kaolin beneficiation process implemented to include selective flocculation, reductive leaching and dewatering. This improved beneficiation process provides refined kaolin for use as a pigment and for other uses equal to or superior to kaolin prepared by prior methods, but with significant savings due to fewer operating steps and materials used. Reduced costs and improved the environment. Background of the invention [0002] Large amounts of kaolin are used as pigments and as filler materials in paper coating compositions. Kaolinite, which is the main component of kaolin clay (or kaolinite clay), is a white clay mineral, so it can give gloss to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03D3/06C09C1/42
CPCB03D3/06C09C1/42C01P2006/22C01P2006/40C01P2004/62C01P2006/60C01P2006/80C01P2004/61Y02P20/10
Inventor R·J·普鲁特J·原C·R·L·戈利M·J·加斯卡
Owner IMERYS PIGMENTS INC