Improved preparation technique for preparing sulphuric acid and cement with gypsum
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A production process, gypsum technology, applied in cement production, sulfur trioxide/sulfuric acid, etc., can solve the problems of low concentration, high power consumption, low gypsum decomposition rate, etc.
Active Publication Date: 2009-01-14
SHANDONG LUBEI ENTERPRISE GROUP
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Abstract
Description
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Problems solved by technology
Due to the limitations of the process, the requirements for raw materials are high, the control range of the main process indicators is wide, and the production is difficult to control; the operation of the rotary kiln is unstable, and liquid phase and ring formation are prone to occur, making it difficult to ensure continuous production; the decomposition rate of gypsum is low, SO 2 The concentration is low and the fluctuation is large, which affects the normal operation of the acid production part; the purification efficiency of the kiln gas is low, and acid wastewater is produced; SO 2 The conversion and absorption rate is low, and the tail gas needs to be neutralized by ammonia before it can be discharged up to the standard; the heat consumption is high, the power consumption is large, and the economic benefit is poor; it is difficult to realize large-scale production
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Embodiment 1
[0097] Embodiment 1 (making raw material with phosphogypsum):
[0098] 1. The main raw materials of phosphogypsum, clay, coke and coal are as follows:
[0099] (1) Main chemical components of phosphogypsum (dihydrate base)
[0100] Phosphogypsum
LOSS
SiO 2
Fe 2 o 3
al 2 o 3
CaO
MgO
SO 3
P 2 o 5
F -
∑
[0101] Wt, %
19.23
3.81
0.27
0.29
31.40
0.44
43.34
0.72
0.16
99.79
[0102] (2) Main chemical components of clay
[0103] clay
LOSS
SiO 2
Fe 2 o 3
al 2 o 3
CaO
MgO
∑
Wt, %
9.10
62.37
4.69
12.15
5.89
2.34
96.54
[0104] (3) Coke industrial analysis, ash analysis
[0105]
[0106] (4) Industrial analysis and ash analysis of burning coal
[0107]
[0108] 2. Main chemical components of...
Embodiment 2
[0136] Embodiment 2 (make raw material with desulfurization gypsum):
[0137] 1. The main raw materials of desulfurization gypsum, clay, coke and coal are as follows:
[0138] (1) Main chemical components of desulfurized gypsum (dihydrate base)
[0139] Phosphogypsum
LOSS
SiO 2
Fe 2 o 3
al 2 o 3
CaO
MgO
SO 3
∑
Wt, %
18.37
0.96
0.22
0.28
32.72
1.13
45.17
98.85
[0140] (2) Main chemical components of clay
[0141] clay
LOSS
SiO 2
Fe 2 o 3
al 2 o 3
CaO
MgO
∑
Wt, %
7.4
70.1
3.0
10.46
5.19
1.64
97.79
[0142] (3) Coke industrial analysis, ash analysis
[0143]
[0144] (4) Industrial analysis and ash analysis of burning coal
[0145]
[0146] 2. Main chemical components of hemihydrate desulfurization gypsum
[0147] Hemihydrate desulfurized gy...
Embodiment 3
[0173] Embodiment 3 (making raw material with salt gypsum):
[0174] 1. The main raw materials of salt gypsum, clay, coke and coal are as follows:
[0175] (1) Main chemical components of salt gypsum (dihydrate base)
[0176] Phosphogypsum
LOSS
SiO 2
Fe 2 o 3
Al 2 o 3
CaO
MgO
SO 3
∑
Wt, %
22.49
7.54
0.55
1.04
31.31
0.10
33.75
96.78
[0177] (2) Main chemical components of clay
[0178] clay
LOSS
SiO 2
Fe 2 o 3
al 2 o 3
CaO
MgO
∑
Wt, %
7.4
70.1
3.0
10.46
5.19
1.64
97.79
[0179] (3) Coke industrial analysis, ash analysis
[0180]
[0181] (4) Industrial analysis and ash analysis of burning coal
[0182]
[0183] 2. Main chemical components of hemihydrate salt gypsum
[0184] Hemihydrate desulfurized gypsum
LOSS
SiO 2
Fe 2 o ...
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Abstract
The invention provides an improved production process of utilizing gypsum to produce sulfuric acid and cement, which relates to the sulfuric acid and cement industry production technology, and the resource comprehensive utilization and environmental protection governing field of the industrial byproduct gypsum. The improved production process is characterized in that natural gypsum with the CaSO4*2H2O as the main composition or the industrial byproduct gypsum is adopted as the main source material; clay, coke and fly ash clinker are used as supplementary materials; the half-water drying gypsum flow, the single stage powder grinding, raw material mixing melting, suspension preheater kiln decomposing calcination, closing diluted acid washing and purification, two-turning and two-suction processes are adopted; the sulfuric acid and cement products are prepared through six steps of source material homogenizing, drying and dehydration, raw material preparation, clinker burning, kiln gas acid production and cement grinding; the improved production process has the advantages of wide range source material, solving the land occupation and environmental pollution problems of the gypsum waste residue, realizing the circulation utilization of sulfur resource, adopting a plurality of new processes and devices, realizing the large scale production easily, advanced technology, mature process, easy operation in production control, low energy consumption, high benefit, no waste water and waste residues exhaust.
Description
technical field [0001] The invention relates to an improved production process for producing sulfuric acid and cement from gypsum, which belongs to the field of comprehensive utilization of sulfuric acid and cement industry production technology and industrial by-product gypsum waste residue resources and environmental protection and treatment. Background technique [0002] The research on gypsum sulfuric acid and cement technology began in the early 20th century. In 1916, Germany's Muller and Kuhne (Muller Kuhne) successfully developed natural gypsum to produce sulfuric acid and cement technology, and established a pilot plant; thereafter, Britain, Germany, Poland, Austria, South Africa, etc. successively built the following Natural gypsum, anhydrite and phosphogypsum are used as raw materials to produce sulfuric acid and cement plant, and put into production. The average daily production capacity of sulfuric acid and cement is 160 tons each. Due to technical and engineeri...
Claims
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Application Information
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