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Current Situation of Energy Consumption and Sewage Discharge in Aluminum Profiles Industry

Energy consumption status quo

At present, the aluminum energy-consuming enterprises mainly include electricity, coal, diesel, fuel oil, natural gas and liquefied petroleum gas. At present, the main reasons for the high energy consumption of aluminum enterprises are: casting furnace, furnace energy consumption is higher; casting furnace and furnace waste heat utilization is not sufficient; extruder Power Saver installation rate is low, resulting in no-load loss , Energy measurement statistics is not sufficient, assessment management is not in place and so on.

Pollutant discharge

(1) exhaust emissions

Aluminum industry, the main source of emissions:

① The thermal exhaust gas from the various thermal equipment, aluminum plant thermal equipment, including aluminum melting furnace, casting furnace, extrusion furnace heating furnace, mold heating furnace, aging furnace, homogeneous furnace, drying oven and curing furnace, These thermal equipment in the fuel combustion will produce combustion exhaust;

② rubbing ash furnace and aluminum melting furnace process waste gas. In the production process, aluminum melting furnace to be heated to a higher temperature to melt aluminum ingots and other metal materials. Therefore, in the purification of raw materials, such as adding melting process, melting aluminum furnace when the furnace will have a lot of dust emissions of gas emissions;

③ powder coating process of dust emissions, in the aluminum surface of the powder coating process, there will be a small amount of powder coating can not be adsorbed on the aluminum surface, the powder will escape.

④ anodic oxidation process and alkaline etching process generated acid mist and alkaline mist emissions.

(2) wastewater discharge

Aluminum casting and extrusion process of the basic production of waste water, surface treatment process in the pre-treatment process, anodizing and coloring process, powder coating and electrophoretic coating process are washing process, the washing wastewater is the main wastewater generated source. In addition, the aluminum surface treatment process using a variety of chemical raw materials, mainly sodium hydroxide, sulfuric acid, nickel fluoride, chromium passivation agent, phosphoric acid, etc., so the aluminum chemical composition of the enterprise complex wastewater, Chromium, nickel, tin, phosphate, fluoride and other pollutants. In general, aluminum production enterprises according to the different types of wastewater pollutants can be divided into tin-containing nickel-containing wastewater, chromium wastewater, phosphorus-containing wastewater, acid-base wastewater, living office waste water.

(3) solid waste and noise

The solid wastes produced by aluminum profile enterprises mainly include aluminum scrap, aluminum dust, scrap molds, waste liquid produced by various chemical treatment processes, sludge generated from sewage treatment process and domestic garbage.

Noise mainly from the fans, pumps and other mechanical equipment, and aluminum cutting, sawing and other production equipment, the noise source range is generally 75 to 110 decibels.