Preparation method of indirect coal liquefaction residue asphalt mixture

Abstract

The invention relates to a preparation method of an indirect coal liquefaction residue asphalt mixture. The preparation method comprises the following steps: step 1, testing various performance indexes of indirect coal liquefaction residues, asphalt, aggregate and mineral powder; 2, determining the optimal use amount of asphalt in the asphalt mixture by adopting a Marshall design method; 3, replacing the fine aggregate with the indirect coal liquefaction residues in a single-mesh particle size and equal-volume manner to obtain aggregate doped with the indirect coal liquefaction residues; 4, respectively placing the aggregate doped with the indirect coal liquefaction residues, the mineral powder and the asphalt in a drying oven, and preheating according to a preset time and a preset temperature; and 5, pouring the preheated aggregate, asphalt and mineral powder in the step 4 into a mixing pot, and mixing to finally prepare the indirect coal liquefaction residue asphalt mixture. According to the method, high-added-value utilization of the indirect coal liquefaction residues can be achieved, waste is turned into wealth, the pavement performance of the mixture can meet the performance requirements of the hot-mix asphalt mixture, and the method has obvious economic benefits and social benefits.

Description

technical field [0001] The invention relates to the technical field of preparation of road building materials, in particular to a method for preparing a coal indirect liquefaction residue asphalt mixture. Background technique [0002] Coal indirect liquefaction technology refers to the process in which coal undergoes steps such as gasification, decarbonization and desulfurization, and then undergoes Fischer-Tropsch synthesis to generate a series of alkane and olefin compounds, and then undergoes tail gas treatment and product refining to obtain qualified oil products and chemical products. However, in the process of coal liquefaction to produce oil, a by-product—Indirect coal liquefaction residue (ICLR)—accounting for 20% to 30% of the raw coal will inevitably be produced. The mineral and chemical composition of indirect coal liquefaction residues are mainly petrographic substances and wax residues of gasification slag, which have certain similarities with mineral components...

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Problems solved by technology

[0004] The invention patent of application number CN213671080U discloses a production unit for the comprehensive utilization of coal indirect liquefaction residue, which is used to improve the utilization rate of coal indirect liquefaction residue in the production process and avoid the loss and waste of components in the residue. The invention patent of application number CN203222714U discloses A hexagonal or octagonal coal indirect liquefaction residue permeable brick with strip anti-skid grooves on the surface can form gaps to facilitate rainwater to drain into the soil during laying. The invention patent of application number CN103172320A discloses an indirect coal liquefaction Residue-free bricks and their production methods, the produced bricks are not easy to deform, crack and shrink, the surface of the bricks is smooth, and the appearance is beautiful, realizing the reuse of residues, but the above research on the application of coal indirect liquefaction residues does not design asphalt mixture

[0005] In addition, the construction of asphalt pavement requires a large amount of natural sand and gravel aggregates. However, the shortage of sand and gravel and the soaring price have restricted the development of road construction to a certain extent. Materials

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