Foamed lightweight aggregate prepared from iron tailings and preparation method thereof

Abstract

The invention discloses a preparation method of foamed lightweight aggregate prepared from iron tailings. The preparation method comprises the following steps: detecting the content of each componentin the iron tailings, and regulating the mass part addition ratio of raw materials; carrying out ball milling until a particle size is 150 microns or below to obtain raw material powder; adding a fluxing agent, a binder, a foaming agent and an aluminum content regulator into the raw material powder to obtain a mixture; conducting granulating to obtain an semi-finished aggregate product; subjectingthe semi-finished aggregate product to drying, sintering at high temperature, and cooling to obtain the foamed lightweight aggregate. The invention further discloses the foamed lightweight aggregateprepared from the iron tailings. According to the invention, the content of each component in different iron tailings is determined, and the ratio of the iron tailings, the fluxing agent, the binder,the foaming agent and the aluminum content regulator is reasonably controlled, so the iron tailings are ensured to have high solid waste utilization rate, the goals of high strength, low stacking density and low water absorption rate are effectively achieved, and the iron tailings in different reservoir areas are fully recycled; and the preparation method is simple in process, friendly to environment, and convenient for industrial production.

Description

technical field [0001] The invention relates to the field of aggregate production, in particular to a foamed lightweight aggregate prepared from iron tailings and a preparation method thereof. Background technique [0002] Iron tailings are the solid waste discharged from the ore concentrator after grinding the ore to select useful components. It is an important source of environmental pollution caused by mining development, especially metal mine development. Since the annual discharge of iron tailings is more than 600 million tons, the comprehensive utilization rate is less than 7%, and the maintenance cost of iron tailings is about 5 yuan / ton. If the iron tailings are not properly utilized, it will consume a lot of money and land. In addition, the iron tailings powder with a particle size of less than 0.15mm is easy to seep and flow out dust, which seriously pollutes water sources, land and air; the dust on the surface of unreclaimed iron tailings ponds is easy to be blow...

AI Technical Summary

Problems solved by technology

The process of preparing lightweight aggregate from traditional iron tailings is complicated, and the utilization rate of solid waste is low. It is impossible to strictly control the range of raw material addition to achieve the goals of high strength, low bulk density and low water absorption, and has not been fully utilized as a resource.