Sintered ceramsite and method prepared from phosphorus tailings as main raw material

Abstract

The invention discloses a method for preparing sintered ceramsite by using phosphate tailings as a main raw material. The method comprises the following steps of crushing the phosphate tailings and steel slag, then adding pulverized fuel ash into an obtained first mixture, and afterwards, adding water into an obtained second mixture to carry out wet grinding, so as to obtain slurry of which the median particle size is less than 5 microns; adding a binder and carbon powder into the slurry, putting an obtained third mixture into a granulator to obtain a raw-material ball; naturally drying the raw-material ball for 6h to 8h at a room temperature, placing the raw-material ball in an electric heating constant-temperature blast drying box, and carrying out constant-temperature drying and aging for 8h to 10h, so as to obtain a semi-finished-product ball; placing the semi-finished-product ball at a preheating zone of a rotary kiln, and preheating the semi-finished-product ball for 30min to 40min at 600 to 850 DEG C, so as to obtain a finished-product ball; placing the finished-product ball at a high-temperature zone of the rotary kiln, calcining the finished-product ball at 1,140 to 1,250 DEG C for 40min to 80min, and then naturally cooling the finished-product ball to the room temperature to subsequently obtain the sintered ceramsite. According to the sintered ceramsite and the method, the potential activity of raw materials is sufficiently excited by adopting the wet grinding; the mill-dust pollution generated during oven drying and dry drying is avoided; the environmental pollution and the resource waste of the stockpiling of the phosphate tailing are reduced to a great extent; the sintered ceramsite prepared by the method has water resistance, high strength, heat resistance and fire resistance, and can be widely used for building structure and landscape.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a method for preparing sintered ceramsite with phosphorus tailings as the main raw material. Background technique [0002] Phosphate rock flotation produces a large amount of tailings, which need to occupy a large amount of land. Due to the large amount of these tailings, when the tailings are corroded or the migratable elements in the tailings undergo chemical migration, they will have a negative impact on the atmosphere and Water and soil cause serious pollution, and lead to soil degradation, vegetation destruction and even a direct threat to the lives of humans and animals. Tailings ponds include tailings dams, reservoir areas, etc., and are the main part of tailings facilities. In the construction of mine production facilities, the investment in tailings facilities is relatively large, generally accounting for about 5% to 10% of the total investment in...

AI Technical Summary

Problems solved by technology

[0005] In the currently disclosed technical solutions, the main raw materials for preparing ceramsite are mostly diatomite (Zhang Ruoyu, 2004), glass waste, red mud, boron mud, quartz sand tailings, etc. (Yin Guoxun, 2008, Xu Xiaohong, 2003, Wu Shengbiao, 2004 , Jin Yiying, 2009), but the proportion of solid waste ceramsite is relatively small at present, and there is an urgent need to develop a large amount of solid waste ceramsite production and application, and there are few reports on the use of phosphorus tailings to prepare sintered ceramsite, which is environmentally friendly and sustainable. The meaning of development