Method for preparing caustic calcined magnesite from magnesite flotation tailings

Abstract

The invention provides a method for preparing caustic calcined magnesite from magnesite flotation tailings. The method comprises the following steps: mixing materials, pelletizing, drying, roasting, washing, filtering and the like. According to the method, anhydrous magnesium chloride, magnesium chloride hexahydrate and corn starch are added into the magnesite flotation tailings to be compressed into compact balls; in a calcining process, activation energy hindering sintering is reduced; in addition, the anhydrous magnesium chloride and the magnesium chloride hexahydrate decompose out chlorideions in a roasting process, the chloride ions can promote magnesite decomposition in the roasting process, a magnesite flotation tailing roasting temperature is reduced, energy consumption is reduced, calcium carbonate in the tailings is simultaneously converted into calcium chloride, the calcium chloride is removed through washing, and an effect of removing calcium is achieved. According to themethod disclosed by the invention, the magnesite flotation tailings are utilized as a main raw material, and the magnesite flotation tailings have the advantages of wide sources and low cost; thus, the problem of environmental pollution caused by stockpiling the magnesite flotation tailings is solved, resourceful and reasonable utilization of the magnesite tailings is simultaneously achieved, theresource utilization rate is improved, and land occupation of the magnesite tailings is reduced.

Description

technical field [0001] The invention relates to the field of solid waste utilization and environmental protection, in particular to a method for preparing light-burned magnesite from magnesite flotation tailings. Background technique [0002] my country is rich in magnesite resource reserves, with proven reserves of about 3.1 billion tons, accounting for a quarter of the world's total reserves, mainly distributed in Liaoning and Shandong provinces, whose total reserves account for about 95.11% of the country's total reserves, of which Liaoning The province is mainly concentrated in the southern part of Liaoning, such as Haicheng, Yingkou and other areas. There are 12 proven mining areas with reserves of 2.577 billion tons, accounting for about 85% of the country's total reserves and 20% of the world's total reserves. However, due to the continuous development of magnesite resources and the continuous improvement of raw material requirements for high value-added magnesium salt...

AI Technical Summary

Problems solved by technology

At the same time, due to the rough management of magnesite resources, there is a relative shortage of high-quality resources

What is more noteworthy is that a large amount of waste of low-grade magnesite not only causes a huge waste of resources, but also pollutes the surrounding environment

The main impurities in magnesite include CaO, Al 2 o 3 , SiO 2 , Fe 2 o 3 Etc., high impurity content will directly lead to the reduction of MgO content in magnesite, and then lead to the consequences of the quality decline of its derivative products, the increase of production cost and the destruction of ecological environment, and do not meet the requirements of sustainable development, so for low The clean, efficient and comprehensive utilization of high-grade magnesite is imminent. Realizing the rational development and utilization of low-grade magnesite and building a clean and efficient new chemical production process can greatly save and protect high-quality magnesite resources and eliminate environmental pollution.