Method for volatilizing, enriching and extracting germanium concentrate from low-quality low-grade germanium-containing powdery brown coal in chain grate furnace

Abstract

The invention provides a method for extracting germanium concentrate from low-quality low-grade brown coal. The germanium concentrate is extracted by utilizing a chain grate furnace, and the method comprises the following steps of: allowing the brown coal to drop to a grate from a coal bucket by means of deadweight, and allowing the brown coal to slowly move from the front to rear along with the grate; adjusting a coal gate, and controlling the thickness of the coal bed to be kept at 500mm; feeding the preheated air from the lower part of the grate, and allowing the air to be intersected with the moving direction of the coal bed, so that the brown coal is combusted, the atmosphere in the chain grate furnace is not required to be controlled, germanium in the low-quality low-grade germanium-containing brown coal can be reduced and volatilized into flue gas, and the smoke dust is collected to serve as the germanium concentrate. According to the method, the effects of fully utilizing the low-quality low-grade germanium-containing brown coal, improving the comprehensive utilization capacity of germanium resources, improving the germanium yield and effectively recycling the complementary energy can be achieved.

Description

technical field [0001] The invention provides a method for extracting germanium, especially a method for extracting germanium concentrate from low-quality and low-grade germanium-containing lignite. Background technique [0002] Germanium is a scattered element, a silver-gray brittle metal with semiconductor properties, so it is also called a semi-metal. With the advancement of science and technology and the improvement of people's living standards, germanium is widely used in industrial and agricultural production, military industry and people's daily life, and the extraction and metallurgy of germanium has also been greatly developed. [0003] The distribution of germanium resources in my country is too scattered, there are very few ore-forming minerals, and there is no separate deposit. Industrial production is mainly recovered from lead-zinc ore and extracted from coal. my country's germanium production starts from the recovery of germanium in coal. In 1956, the first ...

AI Technical Summary

Problems solved by technology

[0004] After the discovery of germanium-containing lignite in Xilin Gol in 1999, germanium was first extracted from high-quality and high-grade lump coal on a small scale with a hand-fired furnace with a fixed grate. Since the hand-fired furnace is only suitable for burning lump coal, the mined Nearly 80% of lignite is low-quality, low-grade, high-moisture pulverized lignite, and the effective utilization rate is very low

Moreover, the ignition point of lignite is very low, only about 300 degrees, and a large amount of accumulated pulverized coal is easy to spontaneously ignite, which is a waste of resources and pollutes the environment