Method of controlling temperature of energy-saving environment-friendly laterite-nickel ore smelting shaft furnace through aluminothermic process
An energy-saving and environment-friendly technology for laterite nickel ore, which is applied in the field of laterite nickel ore energy-saving and environment-friendly shaft furnace smelting, laterite nickel ore smelting and on-line temperature control of aluminum particles, and can solve the problems of prolonging smelting time, reducing production efficiency, and slow heating of smelting temperature. , to achieve good slag making effect, improve recovery rate and save production time.
Inactive Publication Date: 2015-06-03
FUSHUN HANKING DRI CO LTD
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Problems solved by technology
However, it is precisely because of the wet ball entering the furnace that the smelting temperature in the furnace rises slowly, which prolongs the smelting time and reduces the production efficiency.
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[0045] 1. Establish a temperature curve. When the temperature of the melting zone reaches 1600°C, a thermocouple is inserted into the core to represent the center of the zone for detection. Then, the thermocouple is inserted into the zone furnace lining close to the inner surface to measure the temperature, and each zone is measured in turn to calculate the temperature gradient and the corresponding The gradient coefficient of the temperature is established, and the temperature standard curve is programmed into the monitoring expert system program.
[0046] 2. During the production process, the lining temperature is detected online, and the lining temperature is compared with the curve temperature, and the deviation ideal temperature value is automatically calculated.
[0047] 3. Calculate the amount of aluminum particles to be added according to the temperature deviation value and the heat value of aluminum.
[0048] 4. Add aluminum particles to the center of the top of the ...
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Abstract
The invention discloses a method of controlling the temperature of an energy-saving environment-friendly laterite-nickel ore smelting shaft furnace through an aluminothermic process, and belongs to the production field of laterite-nickel ores. The method of controlling the temperature of the energy-saving environment-friendly laterite-nickel ore smelting shaft furnace through the aluminothermic process is characterized in that furnace burden smelting is divided into five areas, namely a preheating area, a restoring area, a combustion area, a smelting area and a separation area, then temperature measurement is carried out, and after a peripheral temperature value is measured, a monitoring expert system carries out contrastive analysis and calculates a variation value of the central temperature. The needed absorption heat is calculated through the temperature variation value, the addition quantity of aluminum particles is affirmed, blown-in oxygen and oxygen in raw ores are captured due to the high calorific value of aluminum, aluminum oxide is generated and enters a slag flow, and the temperature in a reaction area is improved rapidly to reach the standard reaction temperature. According to the method of controlling the temperature of the energy-saving environment-friendly laterite-nickel ore smelting shaft furnace through the aluminothermic process, a monitoring expert system is automatic, the reaction is timely, after the aluminum particles are added into crude fuel, the temperature is improved rapidly, the production efficiency is high, the recovery rate of metallic nickel is improved at the same time, and great economical benefits are achieved.
Description
technical field [0001] The invention belongs to the field of laterite nickel ore production, and relates to an energy-saving and environment-friendly shaft furnace smelting method for laterite nickel ore, in particular to an online temperature control method for smelting laterite nickel ore and adding aluminum particles. Background technique [0002] Previously, our company applied for an invention patent for an energy-saving and environmentally friendly shaft furnace smelting method for laterite nickel ore. It adopts a smelting process without sintering and wet balls into the furnace, which not only saves sintering energy, but also plays a role in the distribution area through wet balls. The function of filtering smoke and dust makes a large amount of smoke and dust absorbed by the steam generated by the wet bulb heating process when passing through the material distribution area, thereby reducing the smoke and dust content in the flue gas. The pellets are also sintered and ...
Claims
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IPC IPC(8): C22B23/02C22B5/04
Inventor 田强赵宙陈玉荣王平
Owner FUSHUN HANKING DRI CO LTD
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