In 2001, the copper-nickel mine achieved the first plan for continuous production in winter, mainly to solve the technical problems of the front bed insulation.
The front bed is a high-temperature container in which the smelting furnace melts and melts to clarify and separate the slag and the ice nickel, and the appearance thereof is a long-temperature melt which is built with refractory materials.
It indicates that the smelting and opening of the furnace is smooth, and two of them are located in the front bed. Therefore, the working condition of the front bed is directly related to whether the whole smelting production can be carried out normally. In the smelting production in previous years, the plan for continuous production in winter has been proposed many times. However, when the temperature falls below 20 °C in November, the diaphragm and bed walls are thickened and the volume is reduced and the temperature is lowered. The separation of slag and ice-nickel is not good, and the operation of discharging slag and discharging nickel is difficult, which makes the production operation difficult to continue. For this reason, for more than a decade, smelting production has been difficult to continue until the end of November, and it will be shut down for production and maintenance. It will be opened in the spring and the next year. The effective production time is only 9 months.
In 2001, the production situation of copper-nickel ore required smelting to be continuously produced in winter. To this end, the Ministry of Mines carefully organized the preparations for winter production, and proposed various schemes for the insulation of the front bed, mainly to take the front bed electrode of some smelters in the mainland. Insulation measures, and made the power parameters required to contact the manufacturer to contact the electrode equipment and design, the result electrode equipment needs 350,000 yuan, the installed capacity should reach 850 ~ 1 000 kW, the operating cost of the electrode equipment is increased, which is not conducive to lowering The production cost, and the main capacity of the copper-nickel mine is also difficult to bear such a large load. In this regard, the leaders of the mines think seriously with a scientific attitude, make a decisive decision on the basis of investigation, boldly innovate, change the original electrode heating and heat insulation, reduce the heat insulation. The heat loss increases the self-heating idea, and proposes a thermal insulation scheme that combines silicate fiberboard insulation to reduce heat loss and improve the blast furnace treatment capacity and increase heat supplementation. According to the heat transfer theory, the technical department regards the heat dissipation of the continuously working furnace through the masonry as a steady state heat transfer. The heat is mainly determined by the working temperature, the material and thickness of the furnace body, and the heat storage of the furnace body passes through the furnace roof and the furnace. The heat loss (Q) of the wall and the overhead bottom is calculated according to the specification: where: ??? is the inner surface temperature of the furnace wall and the air temperature around the furnace (°C) ??? the thickness of different materials of the masonry (m) ???The thermal conductivity of different materials of masonry is 0.02???Experience correction value F???The heat dissipation area of ​​masonry (m is calculated by comparing the heat loss between summer working temperature and winter working temperature) Good aluminum silicate fiberboard is used as insulation material, and the thickness of the insulation material required for the outer wall is calculated according to the difference of heat loss. In the construction, the insulation material is layered according to the shape of the front bed, and then fixed with metal mesh. We commonly call it a cotton coat for the front bed. In addition, according to the heat transfer calculation of the melt entering the front bed of the blast furnace and the total heat loss, it is concluded that the blast furnace processing capacity needs to be improved to increase the enthusiasm of the front bed itself, so that the front bed is slightly over The working condition and production practice prove that the pre-bed insulation measures are feasible. In 2001, the copper-nickel mine successfully achieved continuous production in winter, and the blast furnace front bed was subjected to a severe cold test of 40 °C, which made the smelting production extend one month longer than in previous years, and increased the high-ice nickel production capacity. More than 600 tons, regained the impact of the 515 accident shutdown in 2001, and ensured the completion of the annual production tasks. We reviewed the process of copper-nickel mine production in winter, and one of the experiences was that the front bed of the blast furnace should be full and warm. .
Copper-nickel ore smelting production has achieved a historic leap, but there are still many problems in winter production that need to be overcome, such as silo freezing, difficulty in starting the equipment shifting device, large steam in the slag pool, and restricting smelting. Production is proceeding normally. We will continue to adhere to science and technology as the guide, be brave in innovation, be brave in practice, and constantly sum up experience to push the production and construction of copper-nickel ore to a new level.
Xinjiang Nonferrous Metals Industry Enterprise Reform and Management Proceedings Supplement
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