[Comprehensive] The filter box contains "masks" 90% of the dust is filtered out

On January 5, the copper melting furnace after the technical transformation of Mianyang Tongxin Copper Co., Ltd. was officially put into use. “Environmental protection is also the competitiveness of the company.” The person in charge of the company bluntly stated that during the Central Environmental Protection Inspectorate of the 5th year last year in the province to carry out environmental protection inspections, the investigation team discovered some problems that the company needed to rectify. “In the face of problems, the company has increased The construction of environmental protection facilities, and these environmental investment also bring business opportunities to enterprises."

Tongxin Copper is mainly engaged in processing and deep processing of recycled copper. In the metallurgical industry, how to deal with fumes, sulfur dioxide and other waste gases generated in the smelting process has become an industry problem. On the day of receiving the report on August 14 last year, the Mianyang Municipal Environmental Monitoring Center station conducted on-site monitoring of the organized exhaust gas of the company's melting furnace. After determination, the smoke emission concentration was far lower than the national emission of industrial furnace kiln air pollutants. Limit value.

Although the company's emissions reached the standard, the investigation team did not take measures against diffusion, leakage prevention, and leakage prevention in the dust collection area of ​​the plant, and did not take effective measures to collect and deal with fugitive emissions when the redox material charcoal enters the furnace. Proposed reforms. In response to these problems, the company immediately rectified.

Under the dust removal system in the factory, the company built a special dust prevention fence. Above the fence is a cyclone dust removal system. After the large particles are filtered out, the exhaust gas enters the four filter bins in turn. “We have more than 1,400 bags in our filter warehouse, which can filter out 99.9% of dust.” Ding Jiakui, manager of Tongxin Copper Industry Safety and Environmental Protection Department, said that more than 1400 bags are equivalent to more than 1,400 “masks”.

Under normal production conditions, the bag can be used for 9 months. A cloth bag is about 100 yuan. "This expenditure is completely affordable."

“In the past, when we used the redox of copper, we used charcoal.” Ding Jiakui said that when the charcoal is put into the furnace, it is easy to cause the exhaust gas to run off.

Previously, the company also thought of using natural gas for copper redox but it was difficult to control the reduction temperature.

When charcoal enters the furnace, no effective measures have been taken to collect and dispose of fugitive emissions. After the investigation team pointed out, the company organized technical personnel to carry out technical research and succeeded in mastering the use of natural gas to restore the heat. At present, companies are applying for patents on this technology.

The reporter saw before the continuous casting and rolling facility that the workers used gas pipes to add gas to the furnace to increase the temperature. All the process flow was carried out in a confined space, fundamentally solving the fugitive emissions of exhaust gas.

When the continuous casting and rolling facility is operated, the molten copper needs to be cooled with the emulsion, and organic waste gas is easily generated under high temperature conditions. To collect this kind of exhaust gas, companies put thick canvas on the equipment. The organic exhaust gas is sucked into the exhaust pipe with a diameter of 1 meter through a gas gathering hood, and then the exhaust gas treatment device is connected after the processes such as caustic washing and activated carbon adsorption. deal with.

Before the exhaust gas treatment device, two sets of dust removal equipment have been installed. "A total of more than 8 million yuan has been spent, and this money is very worthwhile." The company official said that because a number of "small scattered" copper smelting enterprises were shut down, the domestic copper price began to rise. "Now every ton of copper is higher than last year." More than 10,000 yuan, the money invested in environmental protection facilities has long been earned back."