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Method for firing ceramics by desulfurized mortar

A technology of desulfurization ash and ceramics, which is applied in the field of firing ceramics with desulfurization mortar, which can solve the problems of destroying the environment, digging mountains and destroying fields, etc., and achieves the effects of lowering the firing temperature, lowering the water absorption rate and increasing the density

Inactive Publication Date: 2010-06-30
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its large-scale use will also lead to digging mountains and destroying fields and damaging the environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Calcium sulfite type desulfurization mortar is desulfurization ash obtained after drying or desulfurization slurry obtained without drying. The calcium sulfite type desulfurization slurry used in this embodiment is a by-product obtained by adopting the lime-calcium sulfite method for flue gas desulfurization, and is mainly composed of calcium sulfite hemihydrate, calcium hydroxide, calcium oxide and water that have not yet fully reacted; by weight In terms of percentage, calcium sulfite 45%, lime 4%, calcium hydroxide 6%, water 45%.

[0030] Table 2

[0031] raw material

SiO 2

AlO 3

Fe 2 o 3

MgO

K 2 o

Na 2 o

LOSS

white clay

60

28

1.5

0.5

1.5

1.5

7

red mud

60

21

8

1

2.6

1.4

6

Gangsha

90

8

2

-

-

-

-

[0032] (1) 65% of red mud, 28% of white mud, 5% of sand, 1% of calcium sulfite type desulfur...

Embodiment 2

[0040] The calcium sulfite type desulfurization slurry composition (percentage by weight) of a factory is: calcium sulfite 50%, lime 2%, calcium hydroxide 8%, water 40%. The chemical composition of red mud, white mud and gang sand is shown in Table 3:

[0041] table 3

[0042] raw material

SiO 2

AlO 3

Fe 2 o 3

MgO

K 2 o

Na 2 o

LOSS

white clay

60

28

1.5

0.5

1.5

1.5

7

red mud

60

21

8

1

2.6

1.4

6

Gangsha

90

8

2

-

-

-

-

[0043] (1) 60% of red mud, 22% of white mud, 3% of sand, 5% of calcium sulfite type desulfurization slurry and 10% of limestone are put into vacuum mud refining machine (TC300 vacuum mud refining machine of Hebi Jintai Ceramic Machinery Equipment Factory) machine), to mix the raw materials evenly by practicing the mud, and improve the plasticity of the mud;

[0044] (2) Arrange the ...

Embodiment 3

[0050] The calcium sulfite type desulfurization slurry composition (percentage by weight) of a factory is: calcium sulfite 55%, lime 3%, calcium hydroxide 7%, water 35%. The chemical composition of red mud, white mud and gang sand is shown in Table 4:

[0051] Table 4

[0052] raw material

SiO 2

AlO 3

Fe 2 o 3

MgO

K 2 o

Na 2 o

LOSS

white clay

60

28

1.5

0.5

1.5

1.5

7

red mud

60

21

8

1

2.6

1.4

6

Gangsha

90

8

2

-

-

-

-

[0053] (1) 57% of red mud, 18% of white mud, 5% of post sand, 10% of calcium sulfite type desulfurization slurry and 10% of limestone are put into vacuum mud refining machine (TC300 vacuum mud refining machine of Hebi Jintai Ceramic Machinery Equipment Factory) machine), to mix the raw materials evenly by practicing the mud, and improve the plasticity of the mud;

[0054] (2) Arrang...

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Abstract

The invention relates to a method for firing ceramics by desulfurized mortar. The method comprises the following steps: putting red mud, white mud, hill grit, calcium sulfite-type desulfurized mortar and Ca-based additives into a de-airing pug mill and thoroughly mixing the raw materials by means of pugging; the calcium sulfite-type desulfurized mortar is a byproduct obtained in flue gas desulfurization by using the lime-calcium sulfite method; covering a plastic film on the pugged mud, standing and aging to form a blank; shaping the blank in a former to obtain a ceramic green body; glazing on the surface of the ceramic green body with Ca-contained glaze to inhibit releasing of SO2 during the firing; putting the glazed ceramic green body into a kiln after drying to fire to obtain ceramic products. The method uses the calcium sulfite-type desulfurized mortar as the raw material for firing ceramics, thereby not only inhibiting releasing of SO2 with the releasing ratio below 25%, but also ensuring the property of the ceramic products. The desulfurized mortar used in the invention can be either the calcium sulfite-type desulfurized mortar produced during the production of the ceramicsor the desulfurized mortar from other kilns.

Description

technical field [0001] The invention relates to the preparation of ceramics in the silicate industry, in particular to a method for firing ceramics using desulfurized mortar. Background technique [0002] Flue gas desulfurization technology is one of the most widely used methods in the world to control SO 2 emission technology. At present, there are many types of flue gas desulfurization processes, which can be generally divided into three types: wet method, dry method and semi-dry method according to the form of desulfurization agent and desulfurization residue. [0003] The lime / calcium sulfite method (semi-dry method) uses lime milk as an absorbent, and adds slaked lime to the flue gas after collecting most of the fly ash for desulfurization to obtain calcium sulfite-type desulfurization products. The main reactions are: [0004] CaO+H 2 O→Ca(OH) 2 [0005] 2Ca(OH) 2 +2SO 2 →2CaSO 3 1 / 2H 2 O+H 2 o [0006] The main mineral composition of the desulfurized morta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/16C04B35/622
Inventor 苏达根钟明峰张志杰蔡克勤冼金源
Owner SOUTH CHINA UNIV OF TECH
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