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In this study, weathered coal as raw material , after extraction , the acid solution , nitrification oxygen Solutions , sulfonated and reduced methylation modification system liquid and solid two forms of humic acid - based additives , used as a water coal slurry additive synthesis process more systematic study and optimization of the process parameters of the process , to determine the optimum conditions were : the process of six steps : ( 1 ) extraction of humic acid sodium : add 20 % of the amount of NaOH ( concentration of 2.5 %) , the reaction temperature of 100 ° C , reaction time 1h . ② humic acid sodium acid solution : 98 % sulfuric acid was added in an amount of 8% ( with sodium humate meter ) , the reaction temperature is 40 ° C , the reaction time was 0.5h. The nitrification oxygen extraction ( 3 ) humic acid : 10 % nitric acid 15% ( humic acid ) , the reaction temperature of 60 ° C , the reaction time 0.1H ; the ④ nitro humic acid and : dosage of sodium hydroxide nitrated humic mass ratio is 15% ( ) , the reaction temperature was 80 ° C. the reaction time was 0.1h ; ⑤ sodium humate sulfonation modified : of nitrated humic acid and a sulfonating agent alkylene over sodium sodium quality ratio of 15 % , , the reaction temperature of 60 ° C , the reaction time 1.5h ; ⑥ modified humic acid sodium carboxymethyl : 37 % formaldehyde in an amount of 2% of the mass of the sulfonated humic acid salt , the reaction temperature of 100 ° C , the reaction time of 1h . The product can also be dried solid additives . Experiments and into pulp evaluation showed that : to increase plasma concentration of 6 % -9 % ( blank ) , coal slurry viscosity ≤ 1200mPa.s , good stability ; solid and liquid products into plasma equivalent . The subject based on domestic raw materials , has the advantages of a wide source of raw materials , the synthesis process is simple , the product into pulp , coal adaptability , low cost price .
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