Selenium extraction method of selenium-containing bone coal

Abstract

A selenium extraction method of selenium-containing bone coal relates to the technical field of bone coal generation and selenium extraction comprehensive utilization and is characterized by comprising the following steps of: mixing selenium-containing bone coal with raw coal at the ratio of 7:3 or 8:2, carrying out high temperature oxidation and combustion in a circulating fluidized bed or rotary kiln of a power plant so as to oxidize stable sulfur selenium ore, copper selenium ore and sulfur iron selenium ore in the bone coal to obtain a selenium oxide gas which can be easily absorbed by an absorbent, allowing the selenium oxide gas with flue gas to enter into a dust collector, collecting dust by the dust collector, processing the dust, enriching selenium oxide, and reducing into the industrial finished product selenium. According to the invention, without increasing the cost and equipment of the power plant and without changing present power plant technologies, the selenium ore resource which originally can not be recovered or have low utilization rate is fully utilized during the power generation, thus reaching considerable economic benefits, realizing the effect of comprehensive utilization and simultaneously achieving a certain social benefit of protecting mountain environments.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of stone coal power generation and selenium extraction, in particular to a method for extracting selenium from selenium-containing stone coal. Background technique [0002] Stone coal is a kind of polymetallic symbiotic shale mine, which has the characteristics of high ash, low calorific value and high hardness. It is distributed in more than 20 provinces such as Hunan, Hubei and Sichuan in my country. Stone coal can be used as low-quality fuel, and many rare metals can be extracted from it, among which vanadium and selenium are the main valuable metals. [0003] For my country's thermal power industry, it needs to use a large amount of coal, and the price of coal has been relatively high in the past two years, resulting in the embarrassing situation that the thermal power industry has been in a state of loss for a long time. Moreover, for some provinces and cities lacking in co...

AI Technical Summary

Problems solved by technology

[0003] For my country's thermal power industry, it needs to use a large amount of coal, and the price of coal has been relatively high in the past two years, resulting in the embarrassing situation that the thermal power industry has been in a state of loss for a long time

Moreover, for some provinces and cities lacking in coal resources, coal-fired power plants need to be purchased from other provinces, and the cost is relatively high

Using selenium-containing stone coal to generate electricity, if the selenium is not recycled, the selenium will be discharged into the atmosphere through the chimney, which will not only pollute the local water source, but also pollute the local vegetation

In addition, the human body is easily poisoned by inhaling toxic selenium gas.

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