Rotary hearth furnace raw material water-washing dechlorination system and water-washing dechlorination technology thereof

Abstract

The invention discloses a rotary hearth furnace raw material water-washing dechlorination system and a water-washing dechlorination technology of the system. The rotary hearth furnace raw material water-washing dechlorination system comprises a vibration material collection device, a hydraulic power mixer, a stirring tank, a slurry pump, a concentration basin, a material mixing groove and a pressure filter and further comprises an agent adding system for adding PAM to the material mixing groove and a water adding system for adding water into the hydraulic power mixer, the agent adding system and the pressure filter. Steel dust and water can be fully and evenly mixed through the vibration material collection device, the hydraulic power mixer and the stirring tank, thus, chloride ions contained in the steel dust can be fully dissolved into the water, the steel dust is dehydrated by the concentration basin and the pressure filter after being fully mixed with the water, then, the water in which the chloride ions are dissolved is separated, and thus rotary hearth furnace raw material with a low chloride content can be obtained. The rotary hearth furnace raw material water-washing dechlorination system can solve the problems of gaseous corrosion and hot corrosion to rotary hearth furnace equipment caused by the concentration of the chloride ions and the problem of crusting blocking caused by the situation that the chloride ions and other substances in the dust form low temperature melt, and the rotary hearth furnace raw material water-washing dechlorination system is favorable for recycling dust of steel and iron enterprises through the rotary hearth furnace.

Description

technical field [0001] The invention relates to a dust dechlorination treatment system, in particular to a water washing and dechlorination system and process for raw materials of a rotary hearth furnace. Background technique [0002] A large amount of dust will be generated in each process of steel production, and the total amount will account for 4% to 7% of the steel output of the enterprise. For a large iron and steel enterprise, the amount will reach hundreds of thousands of tons. This part of the dust contains a relatively high proportion of metal elements such as iron, zinc, and lead, and some unburned carbon elements, which have high resource recovery value. In response to this problem, Nippon Steel Corporation of Japan, Midrex Corporation of the United States, and Canada Enterprises such as the International Nickel Group have developed a process for recovering useful substances in dust using a rotary hearth furnace. The technical principle is high-temperature rapid ...

AI Technical Summary

Problems solved by technology

However, the dust of iron and steel enterprises generally contains 3-10% chloride ion concentration. On the one hand, such a high content of chloride ion concentration will cause gas phase corrosion and thermal corrosion of equipment, and on the other hand, it will also form low-temperature melting with other substances in the dust. body leading to the occurrence of crust blockage

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