Furnace top feeding device of oxygen-enriched double-side-blown molten pool copper smelting furnace

Abstract

The invention discloses a furnace top feeding device of an oxygen-enriched double-side-blown molten pool copper smelting furnace, and belongs to the technical field of copper smelting. The device takes an oxygen-enriched side-blown furnace as main equipment and is characterized in that a device body adopts an inverted-cone-shaped structure and partially adopts flange connection, the exterior of afeeding pipe is provided with uniform-pressure protecting wind, therefore, copper concentrate entering the furnace can completely enter a molten pool to participate in a reaction, coking in a waste heat boiler is effectively controlled, the smoke dust rate is decreased, the copper grade of electric dust remover smoke dust is lowered, and the direct yield of copper is increased. The furnace top feeding device of the oxygen-enriched double-side-blown molten pool copper smelting furnace is low in investment, convenient to install and suitable for being used and popularized.

Description

technical field [0001] The invention relates to process technical equipment in the field of non-ferrous metal smelting, in particular to a furnace top feeding device for processing copper concentrate in an oxygen-enriched double-side blowing melting pool copper smelting furnace. Background technique [0002] In recent years, along with the continuous progress of science and technology, the copper smelting process level of copper smelting furnace using oxygen-enriched double-side blowing molten pool has been gradually improved, and it has been widely used in the field of copper smelting at home and abroad. Oxygen-enriched double-side blowing smelting pool copper smelting furnace is composed of refractory materials and copper water jacket. Oxygen-enriched air is directly blown into the smelting slag layer. The smelting material composed of copper concentrate and auxiliary materials is weighed and measured, and transported by a belt conveyor. To the material transfer station, a...

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Problems solved by technology

[0003] However, the common problem with the top feeding device of the oxygen-enriched double-side blowing smelting pool copper smelting furnace is that in the copper concentrate entering the furnace, some powdery copper concentrate is under the action of negative pressure due to its small particle size and light weight. As the flue gas is brought into the waste heat boiler, it adheres to the inner wall of the boiler and becomes coke, and it will gradually increase and thicken as the production progresses. In severe cases, it will cover the entire flue of the waste heat boiler. When the coking reaches a certain thickness, the heat transfer effect of the waste heat boiler will decrease, and the temperature of the flue gas will rise, which will cause problems in the follow-up process. In severe cases, the production load will drop. If it increases, the flow of flue gas will not be smooth, and in severe cases, the flue in the waste heat boiler will be almost blocked, making it difficult for the flue gas to pass through, eventually leading to shutdown

At present, the general method to solve the above-mentioned coking problem is to try to increase the smelting operation temperature, and use high-temperature tail gas to melt coking. Danger of Furnace Accidents

[0004] Another problem is that when the fineness of some copper concentrates is greater than 350 mesh and the water content is less than 6%, the fine copper concentrates will be sucked into the follow-up device of the waste heat boiler with the power of the flue gas and the negative pressure gravity, so that the recovered soot grade As high as more than 10%, reducing the direct yield of smelting; at the same time, the dust content of the flue gas at the inlet of the electrostatic precipitator can reach up to 50g / Nm 3 , leading to a decrease in dust collection rate, and in severe cases, the smoke and dust block the sulfuric acid purification system, requiring a long time to stop for cleaning

[0005] It leads to many problems such as boiler coking, high copper grade in smoke dust, low direct recovery rate, large dust content at the inlet of the electrostatic precipitator, and poor dust collection effect. Due to the large difference in splash height, most of the materials put into the furnace top fall into the molten pool by their own gravity to participate in the reaction, and some of them are captured by the splashed melt and enter the molten pool to participate in the reaction, but there is indeed a small part of copper concentrate Because the fineness is too small or the water content is too low, it floats above the furnace, and finally is brought into the waste heat boiler, flue, electric precipitator and other devices by the flue gas that is going to be fixed.

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