▎ 摘　　要

NOVELTY - The method for preparing cuprous thiocyanate, involves (S1) adding adsorbent to desulfurization waste liquid that settles naturally, controlling adsorption temperature at 45-65degreesC for 30-60 minutes, after adsorption is completed, filtering to obtain pretreated desulfurization waste liquid, (S2) preparing copper sulfate as saturated solution at 50-95degreesC, mixing with pretreated desulfurization waste liquid, dripping saturated solution of sulfite under stirring conditions, and stirring for 1-30 minutes, filtering, washing with hot sulfite saturated solution and deionized water, and drying, where the mixing volume ratio of copper sulfate solution and desulfurized waste liquid is 1:(1-2.5), and the molar ratio of copper sulfate and sulfite is 1:(0.5-0.7). USE - Preparation of cuprous thiocyanate used in bright color oil and white architectural coatings. ADVANTAGE - The method enables preparing cuprous thiocyanate ensuring improved whiteness, the product has enhanced color, and improves dispersion and oil absorption and other application characteristics, thereby ensuring stability in target marine paint product and prolonged service life. DETAILED DESCRIPTION - The method for preparing cuprous thiocyanate, involves (S1) adding adsorbent to desulfurization waste liquid that settles naturally, controlling adsorption temperature at 45-65degreesC for 30-60 minutes, after adsorption is completed, filtering to obtain pretreated desulfurization waste liquid, (S2) preparing copper sulfate as saturated solution at 50-95degreesC, mixing with pretreated desulfurization waste liquid, dripping saturated solution of sulfite under stirring conditions, and stirring for 1-30 minutes, filtering, washing with hot sulfite saturated solution and deionized water, and drying, where the mixing volume ratio of copper sulfate solution and desulfurized waste liquid is 1:(1-2.5), and the molar ratio of copper sulfate and sulfite is 1:(0.5-0.7). The preparation method of adsorbent, specifically involves (1) weighing polystyrene-block-poly(ethylene oxide) (PS-b-PEO) block copolymer and dissolving in dimethylformamide at material-to-liquid ratio of 1 g/100 mL, adding equal volume of absolute ethanol and twice the volume of deionized water, and stirring vigorously, adding the same volume of deionized water as mixed system for dilution and dispersion, and adding ethylenediamine, graphene oxide solution and ammonium persulfate solution in sequence, stirring for 2-4 hours under condition of ice-water bath, and separating the precipitate, washing the precipitate with anhydrous ethanol and deionized water, vacuum drying, increasing the temperature at rate of 2-5degreesC/minute to 700-800degrees Celsius, heat-preserving for 1-2 hours to obtain carbonized products, where the mass ratio of PS-b-PEO block copolymer and ethylenediamine, graphene oxide and ammonium persulfate is 3:(2.4-2.5):(0.2-0.3):(0.01-0.02), (2) adding sodium bicarbonate and 5-aminoisophthalic acid to 1 mol/L sodium hydroxide solution, stirring and mixing for 10-60 minutes, dripping 2,4,6-trichloro-1,3,5-triazine under stirring conditions, stirring and refluxing for 12-24 hours, cooling, adjusting pH of solution to 2-3 using hydrochloric acid solution, separating the precipitate, washing the precipitate with deionized water, vacuum drying and completely dissolving in dimethylformamide to obtain solution (A), where the molar ratio of sodium hydroxide and sodium bicarbonate, 5-aminoisophthalic acid and 2,4,6-trichloro-1,3,5-triazine is 1:(0.7-0.75):(0.6-0.7):(0.15-0.25), (3) dispersing carbonized product in 0.1-0.5 mol/L zinc nitrate solution, filtering and drying, and disperse in solution (A) at material-to-liquid ratio of 0.5-1 g/100 mL, and hydrothermally reacting the dispersion system at 120-140degrees Celsius for 24 hours, after reaction is completed, separating the precipitate, washing the precipitate with dimethylformamide, increasing the temperature to 800-850degreesC at rate of 3-5degreesC/minute under nitrogen atmosphere, heat-preserving for 2 hours and naturally cooling.