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Method for preparing artificial soil through mixed pyrolysis of lead-copper tailings and crop straw

A technology for crop straw and artificial soil is applied in the field of mixed pyrolysis of lead-copper tailings and crop straw to prepare artificial soil, which can solve the problems of limited adsorption sites for remediation agents, low heavy metal adsorption capacity, and inability to remove sulfur elements, etc. Achieving the effect of high heavy metal adsorption

Pending Publication Date: 2021-02-19
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Among the existing methods and technologies, the application publication number CN 105838379 A discloses an ecological restoration agent for tailings heavy metal-contaminated soil, using some waste as raw materials to prepare an ecological restoration agent for tailings heavy metal-contaminated soil. The adsorption sites of the remediation agent are limited, and the adsorption capacity for heavy metals is not high, and this method cannot remove a large amount of sulfur contained in the tailings soil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The method for preparing artificial soil by mixing and pyrolyzing lead-copper tailings and crop stalks comprises the following steps:

[0034] S1. Mix the crop straw powder and orthophosphate evenly, then add lead-copper tailings powder and mix evenly to obtain a mixture. The mass ratio of orthophosphate, crop straw powder and lead-copper tailings powder is 1:20:500;

[0035] S2. Pyrolyze the mixture obtained in step S1. Nitrogen gas is introduced at a flow rate of 200mL / min before pyrolysis to present an anaerobic state. The heating rate of pyrolysis is 10°C / min. When the temperature reaches 300°C, keep the temperature for 1h, and then Cool to room temperature;

[0036] S3. Take out the pyrolysis product, add bottom mud or sludge to the pyrolysis product and mix evenly to obtain artificial soil. The mass ratio of pyrolysis product to bottom mud or sludge is 80:1.

Embodiment 2

[0038] The method for preparing artificial soil by mixing and pyrolyzing lead-copper tailings and crop stalks comprises the following steps:

[0039] S1. Mix crop straw powder and orthophosphate evenly, then add lead-copper tailings powder and mix uniformly to obtain a mixture. The mass ratio of orthophosphate, crop straw powder and lead-copper tailings powder is 1:50:1000;

[0040] S2. Pyrolyze the mixture obtained in step S1. Nitrogen gas is introduced at a flow rate of 200mL / min before pyrolysis to present an anaerobic state. The pyrolysis heating rate is 20°C / min. When the temperature reaches 500°C, keep the temperature for 3h, and then Cool to room temperature;

[0041] S3. Take out the pyrolysis product, add bottom mud or sludge to the pyrolysis product and mix evenly to obtain artificial soil. The mass ratio of pyrolysis product to bottom mud or sludge is 120:1.

Embodiment 3

[0043] The method for preparing artificial soil by mixing and pyrolyzing lead-copper tailings and crop stalks comprises the following steps:

[0044] S1. Mix the crop straw powder and orthophosphate evenly, then add lead-copper tailings powder and mix evenly to obtain a mixture. The mass ratio of orthophosphate, crop straw powder and lead-copper tailings powder is 1:35:750;

[0045] S2. Pyrolyze the mixture obtained in step S1. Nitrogen gas is introduced at a flow rate of 200mL / min before pyrolysis to present an anaerobic state. The heating rate of pyrolysis is 15°C / min. When the temperature reaches 400°C, keep the temperature for 2h, and then Cool to room temperature;

[0046] S3. Take out the pyrolysis product, add bottom mud or sludge to the pyrolysis product and mix evenly to obtain artificial soil, the mass ratio of pyrolysis product to bottom mud or sludge is 100:1.

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Abstract

The invention discloses a method for preparing artificial soil through mixed pyrolysis of lead-copper tailings and crop straw. The method comprises the steps of raw material mixing, pyrolysis and finished product preparation. The crop straw, orthophosphate and lead-copper tailings are uniformly mixed in proportion and then pyrolyzed, the content of sulfur in the lead-copper tailings can be reducedin the pyrolysis process, and the pyrolysis product is phosphorus-modified biochar and has the advantage of high heavy metal adsorption capacity; bottom mud or sludge is added into a pyrolysis product to prepare viscous artificial soil, and the bottom mud or sludge plays a role in coagulating soil particles to form an anti-scouring carrier, so that a good aggregate structure is favorably formed.

Description

technical field [0001] The invention belongs to the technical field of tailings resource utilization, and in particular relates to a method for preparing artificial soil by mixing and pyrolyzing lead-copper tailings and crop straws. Background technique [0002] my country is rich in non-ferrous metal mineral resources, especially lead and copper, which are important resources for national development. They can be used in various fields and have a direct impact on national economic and social development. With the continuous comprehensive development of human society and the continuous progress of society, the scope of application of lead and copper has been continuously expanded, and the fields of use have gradually increased, which has largely affected the development of my country's lead-copper mine industry. [0003] Lead-copper ore will produce a large amount of tailings in the flotation process. The tailings have been piled up in the tailings pond for a long time, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C09K17/52C09K17/40C05G3/80
CPCB01J20/24B01J20/20C09K17/52C09K17/40C05G3/80C05B7/00C05D9/00C05D9/02C05F7/00C05F11/00
Inventor 黄建洪董泽靖田森林林益超胡学伟赵群
Owner KUNMING UNIV OF SCI & TECH
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