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Preparation method of low-rank coal-based superplasticizer

A high-efficiency water-reducing agent and low-rank coal technology, applied in sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of complex synthesis process and high cost, and achieve high yield, low cost, and high technological cleaning effect

Active Publication Date: 2021-04-16
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the raw materials for the production of polycarboxylic acid-based high-performance water reducers mainly come from petrochemical industries, and the synthesis process is complicated and the cost is high.
At the same time, the cement adaptability and sensitivity of this series of water reducers are more prominent

Method used

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  • Preparation method of low-rank coal-based superplasticizer
  • Preparation method of low-rank coal-based superplasticizer
  • Preparation method of low-rank coal-based superplasticizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Sulfonation of coal: add 120ml H 2 O. 24g NaHSO 3 , 0.4g FeSO 4, 4ml of 1mol / L dilute sulfuric acid, stir and dissolve, add 20g of 100 mesh dry Xilin Gol lignite, and mix well. Then, add 1.5% H2 dropwise to the reactor at room temperature 2 o 2 Solution 240ml, stirring while adding. After the dropwise addition, the stirring reaction was continued for 1 h. Then the temperature was raised to 60°C, the reaction was kept for 1 hour, and the heating was stopped. After the reaction kettle is lowered to room temperature, the obtained product is centrifuged, washed with water until the pH of the washing solution is greater than 5, and dried to obtain sulfonated coal. The mass yield of sulfonated coal based on raw coal is 110.6%.

[0030] (2) Oxidative cracking of sulfonated coal: In a 250ml autoclave, add H 2 O 100ml, KOH 5g, and 10g of sulfonated coal prepared in (1), after stirring and mixing evenly, pour into O 2 to 5.0MPa. Then, the stirring was started and th...

Embodiment 2

[0033] (1) Sulfonation of coal: add 120ml H 2 O, 40g Na 2 SO 3 , 0.9g FeSO 4 , 8ml of 1mol / L dilute sulfuric acid, stir and dissolve, add 20g of 100 mesh dry Xilin Gol lignite, and mix well. Then, add 1.5% H2 dropwise to the reactor at room temperature 2 o 2 Solution 240ml, stirring while adding. After the dropwise addition, the stirring reaction was continued for 2 h. Then the temperature was raised to 100°C, the reaction was refluxed for 1 h, and the heating was stopped. After the reaction kettle is lowered to room temperature, the obtained product is centrifuged, washed with water until the pH of the washing solution is greater than 5, and dried to obtain sulfonated coal. The mass yield of sulfonated coal based on raw coal is 112.5%.

[0034] (2) Oxidative cracking of sulfonated coal: In a 250ml autoclave, add H 2 O 150ml, KOH 8g, and 10g of sulfonated coal prepared in (1), after stirring and mixing evenly, pour into O 2 to 3.0MPa. Then, the stirring was started ...

Embodiment 3

[0037] (1) Sulfonation of coal: add 50ml H in 500ml reactor 2 O. 8g NaHSO 3 , 0.6g Fe(NO 3 ) 2 , 2ml of 1mol / L dilute sulfuric acid, stir to dissolve, add 10g of 100 mesh dry Xilin Gol lignite, and mix well. Then, add 0.5% H2 dropwise to the reactor at room temperature 2 o 2 Solution 200ml, stirring while adding. After the dropwise addition, the stirring reaction was continued for 2 h. Then the temperature was raised to 60°C, the reaction was kept for 2 hours, and the heating was stopped. After the reaction kettle is lowered to room temperature, the obtained product is centrifuged, washed with water until the pH of the washing solution is greater than 5, and dried to obtain sulfonated coal. The mass yield of sulfonated coal based on raw coal is 108.2%.

[0038] (2) Oxidative cracking of sulfonated coal: In a 250ml autoclave, add H 2 O 100ml, KOH 2g, and 10g of sulfonated coal prepared in (1), after stirring and mixing evenly, pour into O 2 to 5.0MPa. Then, the stirr...

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Abstract

The invention discloses a preparation method of a low-rank coal-based superplasticizer, and belongs to the technical field of low-rank coal resource utilization and fine chemical engineering. Low-rank coal such as lignite and sub-bituminous coal is used as raw materials, sulfonated coal is obtained through sulfite sulfonation, sulfonated coal-based humic acid is obtained through sulfonated coal liquid-phase oxidative cracking, and finally the obtained sulfonated coal-based humic acid is subjected to formaldehyde polycondensation to synthesize the coal-based humic acid high-efficiency water reducing agent. The method for synthesizing the high-efficiency water reducing agent by taking the low-rank coal such as the lignite and the sub-bituminous coal as the raw materials has the characteristics of high yield of sulfonated coal-based humic acid and the water reducing agent, low cost, clean process and the like, the synthesized coal-based humic acid water reducing agent has good dispersing, water reducing and slump retaining properties, and the water reducing effect is superior to that of a commercially available naphthalene high-efficiency water reducing agent. Under the condition that the mixing amount is 0.4%, the highest water reducing rate can reach 24.5%, the initial cement paste fluidity is 162 mm, the mortar fluidity is 305 mm, and the mortar fluidity loss rate within 2 h is 6.9%.

Description

technical field [0001] The invention relates to the preparation method of low-rank coal sulfonation and coal-based humic acid high-efficiency water reducer, and belongs to the technical field of low-rank coal resource utilization and fine chemical industry. Background technique [0002] my country is rich in low-rank coal resources, accounting for about 47% of the proven coal reserves, of which the reserves of lignite are 130 billion tons, accounting for about 13% of coal resources. Low-rank coal has a low degree of metamorphism, high H / C and O%, which leads to high moisture, volatile matter and chemical reactivity, poor calorific value and thermal stability, and is prone to spontaneous combustion. In addition, most of the lignite in our country has high ash content. Low-rank coal, which is mainly used for combustion power generation, has low utilization efficiency and serious environmental pollution. Therefore, based on the hydrogen-rich, high-oxygen, and reactive structu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H7/00C08G8/08C04B24/16C04B103/30
CPCY02W30/91
Inventor 王知彩周璁水恒福雷智平任世彪
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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