Method for preparing high-strength sintered water permeable brick by taking coal gangue as main raw material

Abstract

According to the method for preparing the high-strength sintered water-permeable brick by taking the coal gangue as the main raw material, the coal gangue needs to be crushed to be below 0.45 mm, and then the sintered water-permeable brick is prepared through the procedures of batching, pressing and sintering, the technological process is short, the utilization rate of the coal gangue is high, the production cost is low, and the prepared water-permeable brick is high in strength, good in water permeability and high in quality. The requirements of the national standard GB / T25993-2010'permeable pavement bricks and permeable pavement slabs' are met and higher.

Description

technical field [0001] The invention belongs to the technical field of industrial solid waste utilization, and in particular relates to a method for preparing sintered permeable bricks with coal gangue as the main raw material. Background technique [0002] At present, my country's coal gangue has a cumulative stockpile of more than 5 billion tons, and it will increase by 10% to 15% of coal production every year. are of positive practical significance. Steel slag is a kind of industrial solid waste discharged from steelmaking. At present, the total output of steel slag is about 150 million tons, and it will increase by 12-15% of the steel output every year. The resource utilization of steel slag is the main reason for the sustainable and green development of steel plants. way. At this stage, coal gangue is widely used in power generation, building materials, and agriculture. In terms of building materials, the high-value utilization of coal gangue is reflected in the prepa...

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Problems solved by technology

[0003] The chemical composition of coal gangue is mainly silica, alumina, iron oxide and carbon. When preparing sintered permeable bricks, it is mainly through the organic pore-forming agent method or the inorganic pore-forming agent method. The organic pore-forming agent method is in When fired at high temperature, the organic pore-forming agent escapes at a suitable temperature and leaves a gap in the original position to form a water-permeable material; the inorganic pore-forming agent method refers to adding calcium carbonate or magnesium carbonate to decompose at a suitable temperature to generate carbon dioxide , leaving pores in the green body to form a water-permeable material; the disadvantage of this method is that most of the pore-forming agents are organic matter or carbon, which is prone to black core problems during firing and the product strength is not high, and the inorganic mechanism The pores produced by the porogen method are relatively small, resulting in a relatively small water permeability coefficient

[0004] Chinese patent application number CN108129084A discloses a method for preparing high-strength permeable bricks by mixing coal gangue and steel slag with wheat straw ash. This method is to first carbonize wheat straw in a carbonization furnace at 550-600 °C, and then combine coal gangue with a certain particle size and Steel slag is mixed with wheat straw ash, then phenolic resin, silica sol, cement, etc. are added, and injected into the permeable brick model. After vibration and curing, concrete permeable bricks made of gangue steel slag are obtained. The disadvantages of this method are: There are many processes required in the production process, and the cement curing needs to go through a constant temperature and humidity curing room, which needs to be wrapped in plastic film, and the entire production cycle is long Some operations need to be completed at 190-200°C, which requires high equipment; Phenolic resin needs to be added in the production process, which is easy to stick to the inner wall of the equipment and difficult to operate

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