High temperature flue gas anti-glass arsenic waste heat recovery system of roasting dearsenification and method thereof

Abstract

The invention discloses a high temperature flue gas anti-glass arsenic waste heat recovery system of roasting dearsenification and a method thereof. The system comprises an indirect heat exchanger, a coal economizer, and a driving fan, wherein one pipe of the upper end air outlet of the indirect heat exchanger is connected with the coal economizer, the other pipe is connected with the driving fan, the air outlet pipe of the coal economizer is connected with the indirect driving fan, and the air outlet pipe of the driving fan is connected with the lower end air inlet of the indirect heat exchanger. According to the invention, by controlling the high temperature flue gas and hot air temperature, the temperature of the pipe wall of the indirect heat exchanger is controlled, thus the coagulation of the glass arsenic is effectively prevented, and an efficient cooling circulatory system is formed.

Description

Technical field [0001] The invention relates to the technical field of waste heat and energy recovery, in particular to a high-temperature flue gas anti-glass arsenic waste heat recovery system and method for roasting and arsenic removal. Background technique [0002] Since the 1980s, with the rapid development of my country’s gold industry, easy-to-treat gold resources have gradually decreased, and easy-leaching gold resources have almost been utilized, while difficult-to-leaching and extremely difficult-to-leaching ores account for 60% of the total gold reserves. Dealing with gold resources is in urgent need of development. The difficult-to-leaching and extremely difficult-to-leaching ore is characterized by a high content of harmful element As, using conventional cyanidation gold extraction technology, the gold leaching rate is extremely low, and consumes a large amount of sodium cyanide. At present, the pretreatment processes of refractory metallurgical ore that have been mas...

AI Technical Summary

Problems solved by technology

[0003] In the production process of roasting, arsenic, and desulfurization gold smelters, it is common for arsenic-containing high-temperature flue gas to be initially cooled (from 600°C to 700°C to 400°C) when steel surface coolers or air coolers are used. Distributed to the surrounding environment in vain; more importantly, the inner surface of the surface cooler is quickly attached to glassy arsenic oxide crystals, which become thicker and thicker, resulting in a halt in production. It is difficult to remove even by manual beating or vibration. In the end, the surface cooler failed, so it had to be dismantled and reinstalled; due to the long replacement time of the surface cooler, the operation rate of the roasting system was seriously affected, and the dismantled waste surface cooler with glass arsenic inside was difficult to dispose of, polluting the environment Harmful to the health of the operator

[0004] In the production process of roasting, arsenic, and desulfurization gold smelters, there is preliminary cooling of high-temperature flue gas containing arsenic. A foreign technology company uses water spray atomization method for rapid cooling (650°C to 400°C). For example, Chinese patent ZL200720057284.3 discloses a An energy-saving flue gas waste heat recovery system adopts a pre-spraying device, so that when the high-temperature flue gas passes through the flue gas inlet, it directly contacts and mixes with the spray cooling water mist to exchange heat. Although it can solve the problem of glass arsenic adhesion during the cooling process, but A large amount of water enters the high-temperature flue gas and vaporizes, so the moisture in the flue gas is too high, which makes the subsequent process equipment very easy to corrode, and the flue gas is only converted but not used

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