Purification process of high-purity magnesia

Abstract

The invention relates to a purification process of high-purity magnesia. The process comprises the following steps of: performing water washing by using tailings and discarded fine ores with granularity smaller than or equal to 10mm produced in a magnesite exploitation process; adding a little light burning MgO powder to the water washed tailings and discarded fine ores and mixing and pressing to obtain a blank; naturally drying the blank, and light burning the dried blank with a tunnel kiln and a back reflection kiln, and placing the light burned blank into a Raymond mill for fine grinding; at the same time, performing centrifugal air classification purification, and pressing the blank into balls by a dry ball press after fine grinding and purification; and after maintenance and drying, putting the balls into a super-high temperature heavy oil vertical kiln for sintering to obtain a high-purity magnesia product, wherein MgO content is larger than or equal to 97%, and the volume density is larger than or equal to 3.3.g/cm<3>. Compared with the prior art, the purification process of high-purity magnesia has the beneficial effect that the process has the characteristics of low investment, simple process and obvious purification effect, and resources are rationally exploited and utilized, thus the existing problem of shortage of special grade magnesite ore is solved, and the process is very worthy of being popularized and utilized in the industry of magnesia refractory raw material production.

Description

technical field [0001] The invention relates to the technical field of production and purification of magnesia refractory raw materials used in metallurgy and building materials industries, in particular to a purification process of high-purity magnesia. Background technique [0002] The main raw material for the production of magnesia refractories is magnesia. Relying on the unique high-quality natural magnesite resources, China adopts one-step and two-step calcination methods to produce ordinary, medium and high-grade magnesia. With the rapid development of China's economy, metallurgy, building materials The rapid development of industries such as magnesia has become the world's largest steel-producing country, and the demand for magnesia refractory materials is increasing year by year. Therefore, the demand for high-purity and high-density magnesite as a refractory raw material is increasing, and the annual production of several million tons in southern Liaoning is still ...

AI Technical Summary

Problems solved by technology

[0004] At present, the super A-grade ores have been exhausted, the super B-grade ores are very few, accounting for only about 10% of the mining volume, and the super C-grade ores account for 20-30%. A large number of ores are primary and secondary ores, which are not processed Treatment cannot produce high-purity magnesia

[0005] The purification methods of natural magnesite include flotation method, thermal separation method and chemical method. In the process of production and processing, there are thermal separation and air separation methods at the same time. The flotation method has large investment, large area and high cost. There are only two producers with a small scale; the thermal separation method has not been ideal, and no production capacity has been formed; the chemical method has high cost and low output, and is not suitable for the production of magnesia refractory industry. Therefore, the investment is small, the cost is low, An effective purification method is an important issue that urgently needs to be solved and promoted in the magnesia refractory industry