Laterite-nickel ore RKEF smelting process smoke comprehensive treatment system and method

Abstract

The invention discloses a laterite-nickel ore RKEF smelting process smoke comprehensive treatment system which comprises a ferronickel electric furnace, a water cooling flue, a first bag collector, arotary kiln, a cyclone dust collector, a combustion air mixing chamber, a drying machine and a second bag collector; a gas outlet of the ferronickel electric furnace is connected with the lower end ofthe water cooling flue; the upper end of the water cooling flue is connected with a gas inlet of the first bag collector through a pipeline; a gas outlet of the first bag collector is connected witha gas inlet of the rotary kiln through a pipeline; a gas outlet of the rotary kiln is connected with a gas inlet of the cyclone dust collector through a pipeline; the combustion air mixing chamber comprises a combustion chamber and a smoke mixing chamber; a gas inlet of the smoke mixing chamber is connected with a gas outlet of the cyclone dust collector through a pipeline; a gas outlet of the smoke mixing chamber is connected with a gas inlet of the drying machine; and a gas outlet of the drying machine is connected with a gas inlet of the second bag collector through a pipeline. The laterite-nickel ore RKEF smelting process smoke comprehensive treatment system saves energy, is environmentally friendly and is high in smoke utilization ratio.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of smelting flue gas, and in particular relates to a comprehensive treatment system and method for flue gas in the RKEF smelting process of laterite nickel ore. Background technique [0002] The lateritic nickel ore smelting process is currently dominated by the pyrotechnic RKEF (rotary kiln-submerged arc furnace technology for smelting refined ferronickel using lateritic nickel ore). key link. At present, the widely used flue gas treatment has the following processes: [0003] Process 1: [0004] Electric furnace flue gas treatment system flow: electric furnace flue gas → flue → air heat exchanger → bag filter → exhaust fan → exhaust, the hot air heated by the air heat exchanger is used as the combustion air of the rotary kiln. [0005] Rotary kiln flue gas dust collection system process: Rotary kiln flue gas → electrostatic precipitator → exhaust fan → emptying. [0006] Dr...

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Problems solved by technology

[0017] (3) There are many flue gas discharge points in the whole system, and the environmental protection pressure is high

The flue of the electric furnace is about 100m long, and the flue is seriously blocked. The flue must be replaced after about 1-2 months of production, which will affect the production and cost a lot of maintenance.

[0020] (2) The flue gas of the dryer, rotary kiln, and electric furnace is all provided with a negative pressure by a smoke exhaust machine after drying and dust collection. It is difficult to balance the negative pressure of the system, which has a great impact on the negative pressure control of the kiln

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