High-performance ceramsite based on phosphate tailings and preparation method of high-performance ceramsite

Abstract

The invention relates to high-performance ceramsite based on phosphate tailings and a preparation method of the high-performance ceramsite. According to the technical scheme, 80-95 wt% of high-silicon phosphate tailings and 5-20 wt% of high-magnesium calcium phosphate tailings are used as raw materials, 3-5 wt% of dextrin is added, and the raw materials are mixed to be uniform; putting the mixture into a granulator, spraying a 3% polyvinyl alcohol aqueous solution which accounts for 2-5wt% of the mixture under a rotating condition, granulating, and drying; heating to 950-1080 DEG C in a medium-temperature furnace at the speed of 2-3 DEG C/min, preserving heat for 2-4 hours, and cooling along with the furnace; and putting the mixture into a modified solution with the concentration of 0.5-3 mol/L, oscillating for 1-1.5 hours in a constant-temperature oscillator, standing and drying to obtain the high-performance ceramsite based on the phosphate tailings. The method has the characteristics of high resource rate of the phosphate tailings, simple process, low production cost and short production period, and the prepared high-performance ceramsite based on the phosphate tailings is high in strength, high in apparent porosity, small in volume density, low in hydrochloric acid solubility and high in removal rate of heavy metal ions Ag < 2 + >, Ni < 2 + > and Cu < 2 + >.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of phosphorus tailings resources. In particular, it relates to a high-performance ceramsite based on phosphorus tailings and a preparation method thereof. Background technique [0002] At present, most of the raw materials of ceramsite produced are mainly natural resources such as clay, shale, red mud, etc., and there are few studies on the use of solid waste, which will result in a decrease in natural resources and an increase in solid waste. Thereby also increased the production cost of ceramsite. Phosphorus tailings are low-grade phosphate ore enriched with P 2 o 5 Due to the long-term high-intensity development and utilization of phosphate rock resources, a large amount of phosphate tailings are produced every year, which not only occupies a large amount of land, but also causes environmental problems such as water pollution. At present, phosphorus tailings are mainly use...

AI Technical Summary

Problems solved by technology

The prepared lightweight porous phosphorus tailings ceramsite uses too many raw materials, which increases the production cost, and needs to be balled three times, and then dried and sintered in a high-temperature furnace. The process is complicated and the time cost is high. The prepared lightweight The strength of porous ceramsite is 1.24MPa, which is low

[0006] For example, the patented technology of "ceramsite filter material for biological aerated filter and its preparation method" (CN201810367345.9) discloses a kind of iron tailings as the main raw material, with the addition of fly ash, binder and manufacturing method. Pore ​​agent, the hydrochloric acid soluble rate of the ceramsite made by mixing and granulating after roasting is 0.65% at the lowest and 1.113% at the highest. The soluble rate of hydrochloric acid is relatively high, which will reduce the ion removal effect in the acidic wastewater environment