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A kind of method for environmentally friendly recovery of mercury from mercury soot or mercury salt

A technology of mercury salt and mercury soot, which is applied in the field of mercury recovery, can solve problems such as secondary pollution by distillation, and achieve significant environmental and social benefits, clean process, and good labor hygiene conditions

Active Publication Date: 2015-09-23
SHENYANG ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the distillation method has secondary pollution

Method used

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  • A kind of method for environmentally friendly recovery of mercury from mercury soot or mercury salt
  • A kind of method for environmentally friendly recovery of mercury from mercury soot or mercury salt
  • A kind of method for environmentally friendly recovery of mercury from mercury soot or mercury salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The chemical composition of mercury soot is:

[0031] Element content(%) Hg 23.13 HgS 3.89 HgSO 4 0.007 Sb 总 0.31 Sb 2 o 3 0.07 As 2 o 3 0.45 SiO 2 5.3 Al 2 o 3 4.15 CaO 1.55

[0032] (1) Make the electrolysis cathode before electrolysis, specifically (see Figure 2-3 ) The lower part of the conductive rod 1 is welded with the cathode plate mold 2. The inner core of the conductive rod is copper core, and the outer part is casted by lead-antimony alloy. The cathode plate mold is surrounded by a steel mesh into a flat box shape, and the mesh is square, rectangular or diamond-shaped, etc. Geometry, mesh area 250-10000mm 2 ; Mix 98% of mercury soot or mercury salt with 2% of graphite powder, add water to make a paste, fill it into the cathode plate mold and compact it, and the filling method is manually or using an automatic cathode plate forming machine. The thickness of the cathode plate i...

Embodiment 2

[0037] Compared with Embodiment 1, the difference is:

[0038] The main material accounts for 97.5%, fly ash accounts for 2%, graphite powder accounts for 0.5%;

[0039] After step (3) there is also

[0040] (4) Slurry separation. After one cycle of electrolysis, the cathode plate is lifted out of the electrolytic cell, and the cathode slime is extracted from the cathode extraction system; the extracted cathode slime enters the spiral separator to further separate metallic mercury; the said cycle is 36 hours~ 42 hours;

[0041] (5) Solid-liquid separation, the separated cathode slurry enters the filter press with a mud pump for solid-liquid separation, and the filtrate returns to the step (1) slurrying process; the separated filter residue is compacted and enters the furnace to melt out valuable metals ;

[0042] (6) Purify the electrolyte, use the solubility difference of sodium polysulfide to temperature, cool and crystallize sodium polysulfide, and use sodium polysul...

Embodiment approach 3

[0044] Compared with Embodiment 1, the difference is:

[0045] The main material accounts for 97%, fly ash accounts for 2.4%, and graphite powder accounts for 0.6%.

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Abstract

The invention provides a method for recycling mercury from mercurial soot or mercurial salt in an environment-friendly mode. The method solves the problem that secondary pollution exists when waste residues containing the mercury are disposed according to the distillation method. The method is characterized in that a method that the mercury is recycled from the mercurial soot or the mercurial salt according to a cathode solid-phase electric reduction method is adopted. The method comprises the steps that a cathode of the mercurial soot or the mercurial salt is prepared; the cathode and an anode are respectively hung to an electrolytic bath and the array pitch is arranged; a complex solution of sodium hydroxide, sodium sulfate and sodium sulphide serves as an electrolyte, a direct current is connected to the electrolyte for electrolysis so that a mercurial compound can be reduced to the mercury. Through the characteristic that the mercury is insoluble in water and the characteristic of the density variation of the mercury, the mercury is isolated from the bottom of the electrolytic bath. The method has the advantages that the technology process is clean, generation of mercury steam is avoided, the disposal cost is low, and the economic benefit, the environment benefit and the social benefit are obvious.

Description

technical field [0001] The invention relates to a method for recovering mercury from mercury-containing wastes, in particular to using the electrolytic cathode solid-phase electric reduction method from mercury-containing waste residues in chemical industry, mercury soot produced by thermal desorption of mercury-containing soil, mercury soot or mercury-containing waste produced in non-ferrous metallurgical processes. Mercury recovery from mercury fumes. Background technique [0002] Mercury and its compounds have become priority control pollutants in China and the world due to their characteristics of biotoxicity, bioaccumulation, persistence, and long-distance transmission. my country is a major country in the production, use and emission of mercury. The production and use of mercury account for about 60% of the global production and use, respectively. The production and use of mercury cause the discharge of mercury-containing waste. my country's "National Hazardous Waste ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C1/16
CPCY02P10/20
Inventor 张正洁陈扬陈刚冯钦忠祁国恕刘舒陈朝中刘俐媛邵春岩李宝磊
Owner SHENYANG ACAD OF ENVIRONMENTAL SCI