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Multi-metal steam vacuum cascade condensation method and system

A condensation system and multi-metal technology, applied in the field of multi-metal vapor vacuum cascade condensation methods and systems

Active Publication Date: 2021-11-05
CHONGQING CISDI THERMAL & ENVIRONMENTAL ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of this, the purpose of the present invention is to solve the problem of trapping and separating complex multi-metal vapors, and provide a method and system for vacuum cascade condensation of multi-metal vapors

Method used

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  • Multi-metal steam vacuum cascade condensation method and system
  • Multi-metal steam vacuum cascade condensation method and system
  • Multi-metal steam vacuum cascade condensation method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] see figure 1 , is a multi-metal vapor vacuum cascade condensation system, including a vacuum condenser, the vacuum condenser includes a vacuum tank, a metal molten pool 2 arranged at the bottom of the vacuum tank, a water-cooled coil 3 arranged at the middle of the vacuum tank, and a vacuum tank arranged at the bottom of the vacuum tank The water cooling cover 10 at the top; the metal molten pool 2 is equipped with an air intake pipe 1 that is 30° to the horizontal direction, and the water cooling cover 10 is equipped with an air outlet pipe 4; The bottom of the pool 2 is provided with a bottom drain port 15, and the bottom of the condensate collecting pan 13 is provided with an upper drain port 14; the air inlet pipe 1 is also provided with a water cooling jacket with cooling water inside. The cooling water in the water-cooling coil 3 flows in from the upper water inlet 11 and flows out from the lower water outlet 12, adopting the flow direction of up-in and down-out t...

Embodiment 2

[0033] The difference between this embodiment and Embodiment 1 is that the multi-metal vapor introduced is the zinc-containing vapor produced during the zinc leaching slag fire reduction process, the temperature is 900-1000°C, and the temperature of the molten metal pool 2 is controlled at 550-700°C. The internal pressure of the vacuum condenser was controlled at 1.5kPa, and the temperature of the water-cooled coil 3 was controlled at 350-500°C. Sampling and analysis were carried out on the liquid metal discharged from the top of the molten pool and the bottom of the molten pool, washed filter residue, and filtered flue gas. As shown in table 2.

[0034] Table 2

[0035]

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PUM

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Abstract

The invention belongs to the technical field of metal vacuum condensation and separation, and relates to a multi-metal steam vacuum cascade condensation method and system which are characterized in that different temperature fields are established in a vacuum condenser, complex multi-metal saturated steam pressure difference is combined, metal steam cascade condensation is carried out, and meanwhile, tail gas is recycled, so that heat compensation of a metal molten pool is realized. Different temperature fields are divided into a low-temperature area, a medium-temperature area and a high-temperature area, the low-temperature area is formed through a water cooling cover, part of low-melting-point metal is condensed into solids to be enriched, the medium-low-temperature area is formed through a water cooling coil pipe, part of metal is condensed into a liquid phase to be discharged, and the high-temperature area is formed in a metal molten pool; and heavy metal liquid is controlled to be discharged from the bottom of the molten pool by utilizing saturated vapor pressure difference and density difference of different metal liquid, so that trapping and separation of multi-metal steam are realized.

Description

technical field [0001] The invention belongs to the technical field of vacuum condensation and separation of metals, and relates to a multi-metal vapor vacuum cascade condensation method and system. Background technique [0002] The steelmaking process or the lead and zinc smelting process usually produces high-temperature steam containing various metals. After conventional cooling and dust removal, heavy metal dust or sludge containing Pb, Zn, and Cd will be generated. According to the National Development and Reform Commission’s announcement in January 2021 In the List of Hazardous Wastes (2021 Edition), this type of dust has been officially classified as HW23 hazardous waste, which requires high secondary disposal costs. At the same time, the resources and energy in the steam have not been repeatedly recovered and reused. Therefore, the market urgently needs a cooling system for complex polymetallic vapors, which can capture and separate metals and recycle the energy in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B5/16C22B7/00
CPCC22B5/16C22B7/004Y02P10/20
Inventor 赵忠宇郭秀键田文杰倪晓明
Owner CHONGQING CISDI THERMAL & ENVIRONMENTAL ENG CO LTD