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A kind of preparation method of low-rank coal-based superplasticizer

A technology of high-efficiency water reducer and low-rank coal, which is applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of high cost and complex synthesis process, and achieve low cost, high yield, The effect of mild reaction conditions

Active Publication Date: 2022-07-12
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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  • A kind of preparation method of low-rank coal-based superplasticizer
  • A kind of preparation method of low-rank coal-based superplasticizer
  • A kind of 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 in a 500ml reactor 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 evenly. Then, 1.5% H was added dropwise to the reactor at room temperature 2 O 2 The solution was 240ml, and it was stirred while adding. After the dropwise addition, the stirring was continued for 1 h. Subsequently, the temperature was raised to 60° C., the reaction was maintained for 1 h, and the heating was stopped. After the reaction kettle was lowered to room temperature, the obtained product was centrifuged, washed with water until the pH of the washing solution was >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 successively 2 O 100ml, KOH 5g and 10g of sulfonated coal prepared in (1), after stirring and mixing evenly, pour in O 2...

Embodiment 2

[0033] (1) Sulfonation of coal: add 120ml H in a 500ml reactor 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 evenly. Then, 1.5% H was added dropwise to the reactor at room temperature 2 O 2 The solution was 240ml, and it was stirred while adding. After the dropwise addition was completed, the stirring reaction was continued for 2 h. Subsequently, the temperature was raised to 100° C., the reaction was refluxed for 1 h, and the heating was stopped. After the reaction kettle was lowered to room temperature, the obtained product was centrifuged, washed with water until the pH of the washing solution was >5, and dried to obtain sulfonated coal. The mass yield of sulfonated coal based on raw coal was 112.5%.

[0034] (2) Oxidative cracking of sulfonated coal: in a 250ml autoclave, add H successively 2 O 150ml, KOH 8g and 10g of sulfonated coal prepared in (1), after stirring and ...

Embodiment 3

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

[0038] (2) Oxidative cracking of sulfonated coal: in a 250ml autoclave, add H successively 2 100ml of O, 2g of KOH and 10g of sulfonated coal prepared in (1), after stirring and mix...

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Abstract

The invention discloses a preparation method of a low-rank coal-based high-efficiency water reducer, which belongs to the technical field of low-rank coal resource utilization and fine chemical industry. The present invention uses low-rank coal such as lignite and sub-bituminous coal as raw materials, obtains sulfonated coal through sulfite sulfonation, then obtains sulfonated coal-based humic acid through liquid-phase oxidative cracking of sulfonated coal, and finally sulfonated coal-based humic acid is obtained. The humic acid is polycondensed by formaldehyde into coal-based humic acid superplasticizer. The method for synthesizing high-efficiency water-reducing agent using low-rank coal such as lignite and sub-bituminous coal as raw materials provided by the invention has the characteristics of high yield of sulfonated coal-based humic acid and water-reducing agent, low cost, clean process, and the like. The coal-based humic acid water-reducing agent has good dispersion, water-reducing and slump-preserving properties, and the water-reducing effect is better than the commercially available naphthalene-based superplasticizer. Under the condition of the dosage of 0.4%, the water reduction rate can reach up to 24.5%, the initial cement slurry fluidity is 162mm, the mortar fluidity is 305mm, and the 2h mortar fluidity loss rate is 6.9%.

Description

technical field [0001] The invention relates to a low-rank coal sulfonation and a preparation method of a coal-based humic acid superplasticizer, belonging 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 lignite reserves are 130 billion tons, accounting for about 13% of coal resources. Low-rank coal has a low degree of metamorphism and high H / C and O%, resulting in high moisture, volatile matter and chemical reactivity, poor calorific value and thermal stability, and easy spontaneous combustion. In addition, most of my country's lignite ash content is high. Low-rank coal, which is mainly used for power generation, has low utilization efficiency and high environmental pollution. Therefore, based on the structure and properties of low-rank coal rich in hydrogen, high oxygen, and easy to react, the...

Claims

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Application Information

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Patent Type & Authority Patents(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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