HJ 2049-2015Technical specifications for waste gas control of lead smelting (English PDF)

3.1 Lead smelting waste gas

Refers to the lead smelting process generated by the various substances containing harmful substances.

Desulfurization efficiency desulfurization efficiency Refers to the flue gas desulfurization before and after the standard state of dry flue gas (excluding moisture in the flue gas) SO2 concentration difference and desulfurization before the standard State in the dry flue gas SO2 concentration percentage.

3.3 Environment foggy foggy gas collecting

Refers to the system design, the melting furnace, blast furnace, smoke furnace, scum treatment furnace, casting slag and casting machine and other feeding Mouth, outlet and out of the mouth of the smoke and other emissions of the collection process.

4.1 Sources and Classification of Pollutants

4.1.1 lead smelting process of waste gas mainly include all kinds of sulfur-containing dust, dust, sulfuric acid mist, electrolytic acid mist.

A) sulfur-containing dust is mainly produced in the lead concentrate sintering, melting, reduction, slag treatment and other processes. The main pollutants are particles Sulfur dioxide, and lead, zinc, arsenic, thallium, cadmium, mercury and other heavy metals and compounds.

B) dust-containing gases are mainly produced in the process of loading and unloading, transportation, batching, granulation, drying, feeding and lead melting, ingot and other processes, the main pollutants are particulate matter.

C) sulfuric acid mist mainly produced in the acid-making process, the main pollutants for sulfuric acid.

D) electrolytic acid mist produced in the lead electrolysis workshop, the main pollutant is fluorosilicic acid.

4.2 Pollution load

4.2.1 The amount of flue gas in the lead smelting process is determined by actual measurement. All kinds of exhaust gas discharged from each process can be exhausted Measurement, exhaust emissions measurement should be consistent with HJ/T 55, HJ/T 75, HJ/T 76 requirements.

4.2.2 If there is no actual measurement data, the exhaust emissions can be similar to the same scale of production, similar raw materials and products or similar processes of the emission data is determined or determined by material balance.

4.2.3 Lead Smelting Process Flue gas emissions can be checked by the data given by reference formula (1) or Table 1.

Where.

Q - flue gas discharge equipment hour exhaust emissions (m3/h);

P - Emission of pollutants from a flue gas exhausting equipment (kg) during the calculation period;

C - the average concentration (mg/m3) of a pollutant monitoring period for a flue gas discharge equipment;

F - Production load (%) during the monitoring period of a flue gas discharge equipment;

T - the number of hours of production (h) of a flue gas discharge equipment during the calculation period;

Table 1 Source and concentration of pollutants in lead smelting exhaust gas (mg/m3)

Exhaust gas Source Source Particle concentration SO2 (Volume concentration%) Lead and its combination Mercury and its compounds Dusty smoke Raw material preparation, transportation and so on process 5000 ~ 10000 /1400 ~ 3000 50 ~ 250 Sulfur Flue gas sintering Flue gas ISP sintering machine 25000 ~ 40000 an average of 1.0 to 6.0 minimum 0.2, the use of oxygen-rich technology Up to 10 or more Smelting Flue gas ISP blast furnace 150000 ~ 250000 5 General requirements

5.1 General provisions

5.1.1 Lead smelting enterprise construction and operation management should meet the national and local related industry policy, planning and other management requirements.

5.1.2 lead smelting waste gas treatment project should strictly implement the environmental protection project "three simultaneous" system.

5.1.3 Lead smelting emissions should meet the requirements of GB 25466 and local emission standards, in line with the environmental impact assessment approval and to meet the total amount of pollutant control requirements.

5.1.4 lead smelting should be easy to produce waste gas in the organization of the location of the organization set up waste gas collection and treatment equipment, waste gas treatment process should prevent the escape of exhaust gas.

5.1.5 lead smelting waste gas treatment process to prevent the occurrence of secondary pollution, to ensure that wastewater discharge standards to ensure that the governance process to collect of the dust (dust) and other solid waste disposal to meet the provisions of GB 18597, GB 18599, and meet the EIA approval documents required.

5.1.6 lead smelting waste gas treatment project should take feasible technology, production management and administrative management and other effective measures to prevent heavy metals such as the unorganized emissions of contaminants.

5.1.7 Lead smelting exhaust gas treatment project should be installed qualified on-line monitoring equipment, monitoring alarm system and emergency treatment system, in the the line monitoring facility should be connected with the local environmental protection department as required.

5.1.8 lead electrolysis should be taken to reduce the acid mist and acid mist purification treatment measures to ensure that the operating environment and efflux acid mist concentration Allowable concentration limits.

5.1.9 lead anode mud in the process of comprehensive utilization of waste gas should be based on the specific process, the type of gas and gas, select the appropriate Dust, desulfurization, deacidification (alkali) and removal of other harmful gases.

5.1.10 lead smelting flue gas acid and acid waste gas purification system shall not be set up flue gas bypass.

5.2 Clean production

5.2.1 lead smelting enterprises should actively adopt energy-saving emission reduction and cleaner production technology, from the source control of pollutants generated.

5.2.2 lead smelting enterprises should be the full analysis of mineral raw materials, into the furnace lead concentrate heavy metal content should be consistent with GB 20424 begging.

5.2.3 lead smelting waste gas treatment project should be selected according to the smelting process, select the safety, environmental protection, energy saving waste gas treatment workers Arts and equipment.

5.2.4 smoke (powder) dust transport equipment to be sealed or in a negative pressure state, to prevent leakage of environmental pollution.

5.2.5 dust collection system dust, arsenic, cadmium, mercury and other harmful elements is too high, it is not appropriate to return to the smelting system

5.3 Engineering composition

5.3.1 Lead smelting waste gas treatment project, including the main project, auxiliary engineering and public works.

5.3.2 The main project includes exhaust gas collection system, dust collection system, desulfurization system, acid mist control system and by-product processing system.

5.3.3 auxiliary works include electrical, civil, HVAC, fire, instrumentation and control, on-line monitoring, laboratory analysis.

5.3.4 Public works include power supply systems, steam systems, compressed air systems, process water and circulating water systems.

5.4 General layout

5.4.1 The general layout shall comply with the relevant provisions of GB 50187, GB 50988 and GB 50985.

5.4.2 Lead smelting exhaust gas treatment facilities Plane layout should meet the function of the processing unit and the processing process requirements, processing facilities the spacing should be compact and reasonable to meet the requirements of construction and installation.

5.4.3 Pipeline layout should be based on the overall layout, the treatment area within the plane layout, tube media, construction and maintenance Maintenance and other factors to determine the plane and space should be coordinated with the main project.

5.4.4 by-product processing system should be combined with the process and site conditions according to local conditions.

6.1 General requirements

6.1.1 Lead smelting exhaust gas treatment process should be based on the size of lead smelter and different processes of waste gas, waste gas composition and pollution Substance concentration of the actual situation to determine.

6.1.2 Lead smelting exhaust gas treatment project design and construction should take effective sound insulation, noise and vibration measures, noise and vibration control System should meet the requirements of GB/T 50087.

6.1.3 When using a dry dust collector such as a bag filter or an electric precipitator, there shall be measures to prevent the condensation of flue gas

6.1.4 Waste treatment should focus on energy-saving design and waste heat utilization.

6.2 Lead smelting waste gas treatment process

6.2.1 lead smelting exhaust gas treatment process shown in Figure 1.

Lead concentrate smelting reduction of tobacco and tobacco preparation Dust collection emission Waste heat recovery Acid production Desulfurization emission Waste heat recovery emission Desulfurization scum treatment preliminary fire refining electrolytic refining ingot waste heat recovery lead ingot Waste heat recovery Desulfurization emission Copper and sulfur dust collection emission Dust collection emission Reduce acid mist concentration emission Crude lead

Figure 1 lead smelting exhaust gas treatment process diagram

6.3 Waste dust collection

6.3.1 for the lead smelting enterprises using different smelting process, dust collection process technology in Table 2.

Table 2 lead smelting exhaust gas typical dust collection technology flow chart

Particulate matter source dust collection process parameters a Remarks Lead concentrate in the warehouse Material, transportation, ingredients and other processes to produce dust Collecting hood -> bag dust collection (or micro power collection dust B) -> exhaust pipe Total dust removal efficiency > 99.5%, efflux Dust concentration 99.9%, efflux Soot concentration 99.6%, efflux Lead dust concentration 99.8%, efflux Soot concentration 99.5%, efflux Smoke (powder) dust concentration