A method for reducing the toxicity of heavy metal solid waste leaching

A heavy metal and waste slag technology, applied in the direction of improving process efficiency

Active Publication Date: 2019-01-04
INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is a conventional leaching method with the addition of leaching aids. It is aimed at the comprehensive recovery of toxic elements including but not limited to heavy metals in solid waste residues. There is no method for reducing leaching toxicity for major environmentally sensitive heavy metal elements.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] For cobalt hydrometallurgical solid waste containing 0.25% cobalt, 0.12% vanadium, 0.02% nickel, 0.01% copper, 0.03% manganese, etc., remove iron by dry magnetic separation, and add 1‰ calcium chloride and 2‰ sodium pyrosulfite Mix evenly, add to the bottom of the stainless steel acid-resistant tank to pave; add 0.03M dilute sulfuric acid solution at a liquid-solid ratio of 10:1 (L / kg), and soak for 2 hours at room temperature; add flocculant polyacrylamide to the tank, A titanium mesh is placed in the liquid as the positive electrode, and the tank body is the other electrode. During the leaching process, the current density is 30A / m 2 , the tank voltage is 1.2V, the two poles are interchanged during the electric assisted leaching process, the cycle is 50 minutes of forward energization, and then reverse energization for 1 minute, and the total electric assisted leaching time is 3 hours; after leaching, remove the titanium mesh electrode, stir and filter; the filtrate V...

Embodiment 2

[0019] For zinc hydrometallurgical solid waste slag containing 0.33% zinc, 0.05% cobalt, 0.19% vanadium, 0.08% copper, 0.17% manganese, etc., remove iron through dry magnetic separation, add 2‰ calcium carbonate and 5‰ sodium sulfite to mix evenly Add 0.4M dilute sulfuric acid at room temperature for 3 hours at room temperature according to the liquid-solid ratio of 7:1 (L / kg); add flocculant polyacrylamide into the tank, and place lead in the leaching solution The base alloy is used as the positive electrode, and the tank body is the other electrode. During the leaching process, the current density is 60A / m 2 , the tank voltage is 3.1V, the two poles are interchanged during the electric assisted leaching process, the cycle is forward energization for 30min, and then reverse energization for 1min, the total electric assisted leaching time is 2h; after leaching, remove the alloy electrode, stir and filter; filtrate recovery Zinc, vanadium, copper, cobalt, manganese and other va...

Embodiment 3

[0021] For chromium hydrometallurgical solid waste containing 0.06% chromium, 0.09% vanadium, 0.015% lead, 0.04% copper, and 0.02% manganese, remove iron by dry magnetic separation, and add 3‰ calcium chloride and 3‰ thiosulfuric acid Mix the sodium evenly, add the bottom of the titanium acid-resistant tank and pave it; add 0.05M dilute sulfuric acid at room temperature for 1 hour at a liquid-solid ratio of 10:1 (L / kg); add flocculant polyacrylamide to the tank, Place a ruthenium-based multi-component mixture coating in the solution to modify the titanium plate and titanium mesh as the positive electrode, and the tank body is the other electrode. During the leaching process, the current density is 70A / m 2 , the tank voltage is 3.2V, and the two poles are interchanged during the electric-assisted leaching process. The cycle is forward energization for 40 minutes, and then reverse energization for 1 minute, and the total electric-assisted leaching time is 1.5h; Valuable metal el...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a method for eliminating the leaching toxicity of heavy metal solid waste residues. The method comprises the steps that after the heavy metal solid waste residues are subjected to iron removal by magnetic separation, a leaching activating agent and a reducing reinforcing agent are uniformly mixed, a leaching agent is added, leaching is carried out for 1-3 hours in a metal tank at normal temperature, a flocculating agent of polyacrylamide is added into a leaching solution, a metal plate type or mesh type electrode and the metal groove are adopted as electrodes, and electric-assisted leaching is carried out for 1-5 hours; and after leaching is completed, the leaching solution is subjected to liquid-solid separation, valuable metals are recycled from filter liquor, filter residues are washed with hot water and then are piled up. According to the method for eliminating the leaching toxicity of the heavy metal solid waste residues, the valuable metals such as vanadium, copper, cobalt, nickel, zinc and manganese can be recovered at the same time, and the problem of harm-reducing and recycling comprehensive utilization of the heavy metal solid waste residues can be solved; the method is suitable for disinfecting and detoxifying wet-process solid waste residues of nonferrous metals such as the vanadium, the cobalt, the copper, the zinc, chromium and the nickel and ferrous metals such as the manganese and the chromium, and no new pollution can be generated in the process; and the method is simple in process, low in cost and convenient for large-scale industrial implementation.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a method for reducing the leaching toxicity of heavy metal solid waste residue, especially in the process of extracting and comprehensively utilizing non-ferrous metals such as zinc, nickel, cobalt, copper, vanadium, and ferrous metals such as manganese and chromium. A method for disinfection and harm reduction of metallurgical acidic solid waste and neutral solid waste with high heavy metal residues and heavy metal leaching toxicity. Background technique [0002] The dissolution of heavy metal ions is the main cause of environmental hazards caused by solid waste residues. All kinds of hydrometallurgical solid waste residues are exposed to rainwater, especially acid rain, and the heavy metals contained in them will dissolve and migrate, directly causing persistent pollution of the soil environment and water environment, damaging the ecological environment, and seri...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04A62D3/115A62D101/43
CPCA62D3/115A62D2101/43C22B7/007C22B7/04Y02P10/20
Inventor 郭秋松刘志强李伟朱薇张魁芳
Owner INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap