System and process adopting regenerative heating furnaces to heat acidic circulating gas

Abstract

The invention relates to a system and process adopting regenerative heating furnaces to heat acidic circulating gas. The system involves the regenerative heating furnaces, a mixing chamber, a decomposing furnace, a settling chamber, a metal film powder collector, a heat exchanger, a deacidification device and a chimney, wherein the two or more regenerative heating furnaces are arranged, each regenerative heating furnace is connected in parallel in a crossed mode, and each regenerative chamber heating furnace is switched between a combustion heat storage working state and a circulation heatingworking state. According to the system, a heat accumulator is heated, then the low-temperature acid gas is heated through the heat accumulator, the heated high-temperature acid gas enters the decomposing furnace, is mixed with iron-nickel nitrate compound and is subjected to a decomposition reaction to obtain a metal oxide, and the decomposed acid gas is recovered and recycled; and safety explosion-proof measures are set so that carbon deposition inside the regenerative heating furnaces can be effectively prevented, controlled and removed.

Description

technical field [0001] The invention relates, in particular, to a system and process for heating acidic circulating gas using a regenerative heating furnace. Background technique [0002] Southeast Asian countries such as Indonesia and the Philippines have a large amount of laterite nickel ore resources. At present, pyrometallurgical technology such as blast furnace method and rotary kiln method are mainly used to extract metallic iron and nickel in laterite nickel ore, while pyrometallurgy technology can only use nickel-containing 1.5 % above laterite nickel ore. After years of mining, less than half of the lateritic nickel ore resources meet the requirements of pyrometallurgy, and most of the laterite nickel ore cannot be effectively utilized by pyrometallurgical smelting because the nickel content is less than 1.5%, thus becoming abandoned minerals. The hydrometallurgy that has appeared in recent years can form the metals in the laterite nickel ore into nitric acid compo...

AI Technical Summary

Problems solved by technology

After years of mining, less than half of the laterite nickel ore resources meet the requirements of pyrometallurgy, and most of the laterite nickel ore cannot be effectively utilized by pyrometallurgy because the nickel content is less than 1.5%, thus becoming abandoned minerals.

The hydrometallurgy that has appeared in recent years can form the metals in the laterite nickel ore into nitric acid compounds, and then realize the resource utilization of low-quality laterite nickel ore through the nitric acid gas heating furnace and decomposition furnace. The requirements are high, and none of the existing heating systems can meet them

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