Boiler fly ash remelting chromium slag detoxification system for improving blend ratio of chromium slag and method thereof

Abstract

The invention provides a boiler fly ash remelting chromium slag detoxification system and an implementation method thereof. The boiler fly ash remelting chromium slag detoxification system comprises boilers, a chromium slag blend ratio system, fly ash remelting systems, a pulverization system, a chromium slag warehouse grinding system, and cyclones on the boilers, wherein each boiler is provided with two cyclones, and each cyclone corresponds to one independent fly ash remelting system; upper and lower connection pipelines on each cyclone are provided with a wear-resistant tee respectively, two wear-resistant fly ash remelting nozzles are separated in opposite directions, and the total four fly ash remelting nozzles convey fly ash to the cyclones; and a chromium slag warehouse is provided with a fan mill, and the fan mill is connected with the fly ash remelting nozzles of the boilers through an ash conveying pump and pipelines. The boiler fly ash remelting chromium slag detoxification system can increase the blend ratio of treated chromium slag to be between 15 and 20 percent. The system not only increases the blend ratio of the chromium slag, accelerates the treatment speed of the chromium slag, but also improves the stability of chromium slag treatment equipment, has the practicability, and can be widely applied to the industry.

Description

technical field [0001] The invention relates to a system and method for detoxifying chromium slag, in particular to a system and method for detoxifying through a boiler fly ash remelting system. technical background [0002] Chromium is an important metal element with a chemical symbol of Cr and an atomic weight of 51.99. Chromium metal is off-white in color, hard and brittle. Industrial use is mainly used to manufacture high-strength alloy steel and heat-resistant, wear-resistant and corrosion-resistant alloy steel, and is also commonly used in electroplating. Most of the hexavalent compounds of chromium are toxic, irritating, corrosive and allergic, and some chromium compounds are carcinogenic. For example, the chromium slag discharged from the chromium salt industry has become a toxic and harmful solid waste because it contains 1% to 2% calcium chromate (carcinogen) and 0.5% to 1% water-soluble hexavalent chromium ion (very toxic substance). , was listed by the former ...

AI Technical Summary

Problems solved by technology

However, in the existing technology, the corresponding relationship between the cyclone and the fly ash remelting system is single, and the operation mode is not flexible enough, which greatly restricts the speed of chromium slag treatment

And at the secondary air outlet, fly ash is easy to enter the cyclone together with the secondary air, and the fly ash remelting nozzle is easy to coke at the secondary air outlet, which affects the stability of boiler combustion

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