Efficient metallurgical rotary kiln for treating lead-zinc oxide ore
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A lead-zinc oxide, rotary kiln technology, applied in rotary drum furnaces, furnaces, furnace types, etc., can solve the problem of not being able to obtain effective volatilization recovery, and achieve the effect of reducing material kiln formation and prolonging production cycle.
Pending Publication Date: 2017-05-31
YUNNAN CHIHONG ZINC & GERMANIUM
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Valuable metals in materials cannot be effectively volatilized and recovered
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Embodiment 1
[0021] After mixing and granulating lead and zinc oxide mineral materials with coke powder and raw coal at a ratio of 1:0.30 to 0.35, they are fed into the preheating zone 17 of the rotary kiln body 1 through the feed port 2, and the Driven by the body mechanical transmission assembly 12, during the rotation of the rotary kiln body 1, the coke powder and raw coal in the material are continuously ignited and burned in the preheating zone 17, so that the temperature of the material rises to between 680-700 °C. The rotary kiln body 1 gradually transports the material to the high temperature zone through rotation, so the material is continuously sent to the reduction zone 16 as the rotary kiln body 1 rotates. The heat exchanger 5 uses the heat produced by the rotary kiln itself to heat the high-pressure air generated by the blower device 3 into hot air with a temperature of about 500°C, and then feeds it from the hot air inlet 6 to the reduction zone 16 of the rotary kiln through t...
Embodiment 2
[0023] On the basis of Example 1, if the hot blast heated by the heat exchanger 5 is added to the reduction zone 16 of the rotary kiln body 1 through the hot blast pipe 14 from the hot blast inlet 6, the temperature of the reduction zone 16 cannot reach the required level. 1200-1300°C, the gas nozzle 7 can be opened, and coal gas or natural gas can be sprayed into the reduction zone 16 to ensure that the temperature of the rotary kiln is between 1200-1300°C, so as to ensure that the lead, zinc and other metals in the material are in the rotary kiln body The reduction zone 16 of 1 is reduced, volatilized and oxidized to form metal oxides.
[0024] The feature that the present invention differs from the traditional rotary kiln is:
[0025] 1) A heat exchanger is added outside the reduction zone of the rotary kiln body. The heat exchanger heats the air produced by the blower equipment to about 500 degrees, and blows it in from the hot air heating port at the head of the rotary ki...
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Abstract
The invention relates to an efficient metallurgical rotary kiln for treating lead-zinc oxide ore and belongs to the field of structural designs and application of non-ferrous metallurgical industry equipment. The efficient metallurgical rotary kiln for treating lead-zinc oxide ore comprises a rotary kiln body, a feed opening, air blasting equipment, an air inlet pipe, a heat exchanger, a hot air adding opening, a discharge opening, an exhaust gas outlet, a rotary kiln support roller, a rotary kiln mechanical transmission component and a hot air pipe. As the heat exchanger is added to the outside of a reduction area to heat air produced by the air blasting equipment up to about 500 DEG C, air required for in-kiln reaction is provided while an in-kiln material is heated up, accordingly, the temperature of the reduction area reaches 1,200-1,300 DEG C, and normal reaction is guaranteed. Besides, a gas nozzle is arranged at the head part of the rotary kiln, and if the temperature of the reduction area does not reach 1,200-1,300 DEG C, the gas nozzle can be ignited for heating, so that the temperature of the reduction area is guaranteed, effective volatile reaction of the material in the reduction area is ensured, meanwhile, in-kiln material coking is reduced, and the production cycle of the rotary kiln is prolonged.
Description
technical field [0001] The invention belongs to the field of structural design and application of nonferrous metallurgical industrial equipment, and in particular relates to a high-efficiency metallurgical rotary kiln for processing lead-zinc oxide ore. Background technique [0002] Rotary kiln refers to rotary calcining kiln (commonly known as rotary kiln). Rotary kiln can be divided into cement kiln, metallurgical chemical kiln and lime kiln according to different processing materials. In non-ferrous metallurgy, it is common to use a rotary kiln to sinter and roast metal ores, concentrates, intermediates, etc. such as lead and zinc. [0003] At present, rotary kilns are mostly used in the process of processing lead, zinc, lead oxide and zinc ore. The process is to add lead, zinc oxide ore, coke powder, raw coal, etc. into the rotary kiln. The combustion of coke powder and raw coal produces a large amount of heat and carbon monoxide gas, so that the furnace maintains a rel...
Claims
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