Method for preparing ultralight ceramsites from clay iron-containing tailings

Abstract

The invention discloses a method for preparing ultralight ceramsites from clay iron-containing tailings. The ultralight ceramsites are prepared from the following raw materials in percentage by weight according to dry basis weight: 40-48 percent of clay iron-containing tailings, 40-48 percent of coal series kaolinite or coal gangue and 8-15 percent of dewatered sludge; the method comprises the following preparation processes: mixing materials, pelletizing, drying, preheating, calcining and cooling; under an optimum formula and process conditions that the preheating temperature is 500-600 DEG C, calcination temperature is 1250-1350 DEG C, and the heating rate is 10-15 DEG C / min, the all-solid waste ultralight ceramsites with the bulk density of 390 kg / m<3>, cylinder compressive strength of 1.2 MPa and the water absorption of 3.8% can be prepared through firing, and meet requirements of GB / T17431.1-2010, a novel approach is developed for abundant utilization of tailings, coal gangue and dewatered sludge and obvious economic benefits, environmental benefits and social benefits are realized.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of solid waste, and in particular relates to a method for preparing lightweight ceramsite by using solid waste such as clay iron-containing tailings. The prepared ultra-light ceramsite can be used for thermal insulation concrete and its products, and It is used in horticulture, food and beverage, chemical industry, petroleum and other fields. Background technique [0002] Tailings, coal gangue, and dewatered sludge are solid wastes, and their large stockpiles will bring economic, environmental, and safety problems, such as occupying a large area of ​​land, polluting the environment, and causing potential safety hazards. How to utilize solid waste such as tailings, coal gangue and dewatered sludge in large quantities to achieve the purpose of reduction, harmlessness and resource utilization has become a research hotspot and difficulty at home and abroad. [0003] Traditional ceramsite raw ...

AI Technical Summary

Problems solved by technology

Ultra-light ceramsite has very strict requirements on the raw material formula, so it is generally only partially replaced by solid waste for clay or shale, or solid waste is added to non-solid waste materials such as coal and water glass to prepare ultra-light ceramsite. There are few light ceramsites, and there is no relevant report on the use of tailings to prepare ultra-light ceramsite from solid waste

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