Test plan for waterproof additives in bio-sulfur-fixing coal for industrial use

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Industrial briquettes are classified into three categories based on their uses: a. Industrial fuel briquettes； b. Gasified briquettes ； c. Coking briquettes. Bio-sulfur-fixing coal refers to a type of clean coal product in solid form that meets industrial and domestic coal standards; it is created by mixing coal that has been crushed to a certain particle size and dried to an appropriate degree, along with combustible materials such as crop straws, sawdust, and rice husks, as well as sulfur-fixing agents and composite additives, in specific proportions. This mixture is then processed using high-pressure molding machines to produce blocks with certain strength, shape, particle size, and physicochemical properties. Based on the mechanism of bio-sulfur-fixing briquetting coal, which does not require the use of any binders; instead, raw coal and biomass are heated and dried to a moisture content of 5%, after which high-pressure molding is applied to raise the temperature under pressure, thereby reaching the softening points of lignin and cellulose and enabling the coal particles to bond together, two organic agents, ML and JC, are planned to be used for waterproofing tests. 1.1 Waterproofing test with ML additive: First, the ML additive is crushed and then added to the dried raw coal and biomass for mixing and molding. This waterproofing agent is of the additive type, and the briquette product is a briquette with moderate water resistance. The cost of ML additives is around 20 yuan per ton of briquettes. 2.2 JC additive waterproofing test: Based on the mechanism of forming bio-sulfur-fixing briquettes, these briquettes still have a relatively high residual temperature when they come out of the forming machine. They can be placed in a tank containing the JC waterproofing agent, immersed there for a short time, and then taken out to cool down, thereby achieving a waterproofing effect. The JC waterproofing agent is of the post-treatment type, and the briquette product possesses high water resistance; the cost of the JC waterproofing agent is 20–25 yuan per ton of briquettes. 2. Test costs 2.1 ML additive waterproofing test a. ML additive grinder: 10,000 yuan b. Raw material procurement: 25,000 yuan · Pulverized coal and coal slurry · Biomass · Sulfur fixation agent · ML additive c. Labor costs and energy consumption (water, electricity, oil): 25,000 yuan 2.2 JC additive waterproofing test* a. Waterproofing post-treatment tank and extraction device: 10,000 yuan b. Raw material procurement: 25,000 yuan · Pulverized coal and coal slurry · Biomass · Sulfur fixation agent · JC additive c. Labor costs and energy consumption (water, electricity, oil): 25,000 yuan 3.3 Total cost: 120,000 yuan *Note: This test can be carried out simultaneously with the coal blending test, allowing for a reduction in some of the raw material costs.