Method for in-situ pyrolysis of copper tailings through biomass

A technology of in-situ pyrolysis and copper tailings, applied in the restoration of contaminated soil, etc., can solve the problems of a large amount of time for ryegrass, long repair time, and increased repair costs, and achieve reduced preparation costs, simple construction, and reduced The effect of processing costs

Inactive Publication Date: 2021-09-24
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The defect that this invention exists is that repairing time is long, ryegrass needs a lot of time from planting to harvesting, and repairing cost increases

Method used

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  • Method for in-situ pyrolysis of copper tailings through biomass
  • Method for in-situ pyrolysis of copper tailings through biomass
  • Method for in-situ pyrolysis of copper tailings through biomass

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A method for biomass in-situ pyrolysis of copper tailings, comprising the following steps:

[0029] (1) Select a 10×6m flat land in the metal mine tailings reservoir area, dig to a foundation pit with a depth of 40cm, and dig an ignition foundation groove on each side.

[0030] (2) Air-dry the copper tailings and biomass raw materials for 3 days, crush the biomass to a length of 10-40 cm, crush the tailings, and pass through a 100-mesh sieve for later use.

[0031] (3) Spread 4cm thick branches on the bottom of the foundation pit, spread 6cm thick wheat straw and pampas grass on the upper layer, then spread a layer of 5cm thick pine leaves, spread 3cm thick 100 mesh copper tailings in the middle, and then spread 4cm thick rice straw on the upper layer, Miscanthus, the top layer is covered with 2cm thick 100 mesh copper tailings. Branches, straw, and Miscanthus are laid crosswise, and pine leaves are densely laid, according to the mass ratio of biomass:copper tailings o...

Embodiment 2

[0039]A method for biomass in-situ pyrolysis of copper tailings, comprising the following steps:

[0040] (1) Select a flat land of 10×6m in the metal mining area, and dig a foundation pit with a depth of 40cm for use. Dig an ignition foundation groove on both sides of the foundation pit.

[0041] (2) Dry the copper tailings and biomass raw materials for 4 days, crush the biomass to a length of 10-40 cm, crush the tailings, and pass through a 100-mesh sieve for later use.

[0042] (3) Spread 5cm thick branches on the bottom of the foundation pit, spread 7cm thick wheat straw and miscanthus on the upper layer, then spread a layer of 5cm thick pine leaves, spread 4cm thick 100 mesh copper tailings in the middle, and then spread 4cm thick rice straw on the upper layer, Miscanthus, the top layer is covered with 2cm thick 80 mesh copper tailings. Branches, straw, and Miscanthus are laid crosswise, and pine leaves are densely laid, according to the mass ratio of biomass:copper tai...

Embodiment 3

[0050] A method for biomass in-situ pyrolysis of copper tailings, comprising the following steps:

[0051] (1) Select a flat land of 10×6m in the metal mining area, and dig a foundation pit with a depth of 40cm for use. Dig an ignition foundation groove on both sides of the foundation pit.

[0052] (2) Dry the copper tailings and biomass raw materials for 5 days, crush the biomass to a length of 10-40 cm, crush the tailings, and sieve them for later use.

[0053] (3) Spread 6cm thick branches on the bottom of the foundation pit, spread 8cm thick wheat straw and miscanthus on the upper layer, then spread a layer of 5cm thick pine leaves, spread 5cm thick 100 mesh copper tailings in the middle, and then spread 5cm thick rice straw on the upper layer, Miscanthus, the top layer is covered with 2cm thick 80 mesh copper tailings. Branches, straw, and Miscanthus are laid crosswise, and pine leaves are densely laid, and the mass ratio of biomass to copper tailings is 2:5.

[0054] ...

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PUM

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Abstract

The invention discloses a method for in-situ pyrolysis of copper tailings by biomass, which comprises the following steps: 1) a foundation pit is dug in a metal mine tailing pond area, and ignition foundation trenches is dug in two sides of the foundation pit; (2) the copper tailings and the agricultural and forestry waste biomass raw materials are naturally air-dried and crushed, and the copper tailings are broken and sieved for later use; (3) thick branches are laid at the bottom of the foundation pit, laying wheat straw and miscanthus are laid on the upper layer, then a layer of pine needles are laid, copper tailings are laid in the middle, rice straw and miscanthus are laid, and copper tailings are laid on the top layer; (4) biomass is ignited at the ignition foundation trench, the ignition foundation trench is closed when the biomass and the copper tailings are combusted for 2-5 min, the top of the foundation pit is covered with an iron sheet, and combustion is in an oxygen isolation state; and (5) after the biomass and the copper tailings are fully combusted until flames are extinguished and the temperature is reduced, the combusted biomass and the copper tailings are fully and uniformly mixed to obtain the copper tailing biochar. The problems of mine repair and utilization can be effectively solved.

Description

technical field [0001] The invention relates to a method for pyrolyzing copper tailings in situ with biomass, and belongs to the technical field of mine restoration. Background technique [0002] Tailings are a by-product of mineral processing, usually stored untreated in tailings ponds, and are a mixture of sand, fine-grained solid matter, water and large amounts of heavy metals. At present, with the development of my country's mining industry, the discharge of tailings has also increased. The cumulative discharge of tailings in my country has exceeded 10 billion tons, and there are more than 12,000 existing tailings ponds. The tailings ponds with accumulated tailings occupy a large area of ​​land, including farmland and forest land. On the one hand, the accumulation of tailings destroys land resources; Under the influence of acidification and oxidation, acid mine wastewater is formed, which brings serious disasters to the environment; secondly, the tailings contain a larg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/06B09C1/08
CPCB09C1/065B09C1/08
Inventor 黄建洪司美艳田森林赵群
Owner KUNMING UNIV OF SCI & TECH
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