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Gravity Distillation equipment manufacturers zinc distillation plant design

Author:Zhejiang Chemical Equipment Co., Ltd. Chong Hing Source: posted on:2015-08-28 10:06:10
Gravity Distillation equipment manufacturers zinc distillation plant design
Crude zinc as a raw material, the use of fractionated distillation furnace, production of refined zinc in zinc smelter plant design. Refined zinc zinc content of 99.99% - 99.995%.
Raw materials and fuel impurities in crude zinc grades of refined zinc production, productivity and distillation furnace life has a great impact. Zinc production was higher than 99.99% of refined zinc, lead content requirements of crude zinc is less than 2%, less than 0.3% of cadmium, tin and iron were lower than 0.05%.
Tower distillation furnace commonly used gaseous fuel, heavy oil can also be used, mini-tower distillation furnace can be coal as fuel. Furnace gas purification used as fuel, requiring gas heating value is higher than 5400kJ / m3, containing more than 25% CO, dust less than 0.2g / m3. Coal as a fuel, the calorific value is higher than the requirements of bituminous 25000kJ / kg.
Distillation process is the use of different metals boiling, evaporation and condensation alternately repeated separation process purification of metals. Or from distilled zinc smelting, distillation sent liquid zinc, into the smelting furnace melting and holding, the feeder evenly added continuously lead column (zinc fractionator group to remove lead and other impurities of iron tower), in certain temperature, most all of the zinc and cadmium into the vapor state evaporation. Lead and high boiling impurities in the liquid alloy form liquation furnace flowing into the lower portion of the lead from the tower. After segregation eligible for B number of zinc (zinc low cadmium, also known as non-cadmium zinc), hard zinc (iron high zinc) and crude lead. Zinc, cadmium and lead column condenser vapor through evaporation is condensed into a liquid containing cadmium, zinc, cadmium inflow after cadmium Taga feeder tower (zinc cadmium fractionator group except for refined zinc output tower), cadmium volatile vapor state , condensed to obtain a high cadmium zinc or cadmium dust. Zinc liquid through trays from the bottom of the tank flows into refined zinc. No. B zinc lead tower dedicated to the centralized processing or returns lead column. Hard zinc is generally returned to the distillation furnace for the production of zinc white or raw materials. Zinc distillation process shown in Figure 1.
Major equipment melting furnace, zinc refiner and liquation furnace.
Melting furnace roof sandwich usually indirectly heated horizontal furnace hearth area can rate calculated according to bed. Crude zinc melting the bed can rate 5 ~ 6t / (m2 • d), liquid zinc insulation bed can rate 8 ~ 8.5t / (m2 • d).
Zinc distillation column consists of several overlapping trays from the tower and the combustion chamber, the condenser and the reservoir tank and other components of zinc zinc refining equipment, including lead and cadmium tower tower. The main structure shown in Figure 2 zinc refiner.
Rectangular tray (1) Lead and cadmium Tata tower body comprising 46 to 53 made of silicon carbide from overlapping, often including chassis, evaporator, air guide plate, feed tray, reflux plate and outlet plate. Tray size, with group and set up, the general reference to production practices design, production capacity by the tower wall work intensity, that a single tower heated area of ​​the production of effective strength t / (m2 • d) Calculation column combined according to the scale of production and crude zinc containing impurities determined. Common Table column combination.
(2) the condenser by the use of silicon carbide bricks or clay bricks, empty room, the metal vapor condensation in the indoor heat, liquid metal receptacles condensed set its bottom, using liquid seal isolated from the atmosphere. Volume of the condenser is determined according to the desired amount of metal and condenser condensate volume strength. Condensate volume strength, lead column condenser is 5 ~ 6t / (m3 • d), cadmium column condenser is 2.0 ~ 2.2t / (m3 • d).
Liquation furnace by a segregation cell and B cell in series of zinc, segregation cell volume calculated based on the amount of processing time is determined and segregation, segregation time is 60 ~ 120h, generally take 48 ~ 96h. No. B effective volume of zinc can be calculated once per 4h put.
Workshop configuration usually possible to shorten the distance between the distillation or meltshop to transport liquid zinc. With an annual output of refined zinc million t the following workshop can take single span layout, namely feeding, rectification and casting and other operations are concentrated on a cross; million t more plants can be double cross arrangement, namely the addition, distillation in a cross, casting and In another cross-finished products. Distillation main axis of the furnace should be consistent with the prevailing wind direction, clearance between the furnace and the furnace is generally 1.8 ~ 2.4m.
The main technical and economic indicators of the technical and economic indicators of three tower distillation furnace is:
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