Phosphorus slag-based repairing material for lead polluted soil

A technology for remediating materials and polluted soil, which is applied in the restoration of polluted soil, soil conditioning materials, organic fertilizers, etc., can solve problems such as limited resources, and achieve the effects of low energy consumption, obvious effect and low production cost.

Active Publication Date: 2017-11-24
湖北冉擎建设工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solidification / stabilization of lead by phosphate must have enough dissolved phosphorus sources to provide enough phosphorus to solidify / stabilize lead and meet the formation of phosphorite. However, apatite, which is insoluble in nature, is the main source of phosphate fertilizer raw materials, limited resources

Method used

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  • Phosphorus slag-based repairing material for lead polluted soil
  • Phosphorus slag-based repairing material for lead polluted soil
  • Phosphorus slag-based repairing material for lead polluted soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The ratio of phosphorus slag-based repair materials: phosphorus slag is 70%, boiling slag is 16%, petroleum coke desulfurization ash is 3%, cement kiln dust is 9%, admixture 2.0% (the admixture is composed of potassium laurate 15% , sodium dodecylbenzene sulfonate 23%, sodium lauryl sulfate 36%, sodium lignosulfonate 26% compounded), and then stirred for 30-45 minutes to mix evenly into a repair material.

[0023] The optimal water content of a lead-contaminated soil is 16.7%, and the indoor compaction experiment determined that the minimum content of the contaminated soil remediation material is 5.4%. Use a rotary tiller to till the bottom layer of the contaminated soil at a specified depth, adjust the moisture content of the contaminated soil to the optimum moisture content of 20.7%; then calculate the total amount of phosphorus slag-based restoration materials added based on 7.4% of the dry weight of the contaminated soil, and spray the restoration materials evenly I...

Embodiment 2

[0028] The ratio of phosphorus slag-based repair materials: phosphorus slag is 77%, boiling slag is 9%, petroleum coke desulfurization ash is 10%, cement kiln dust is 2.5%, admixture 1.5% (the admixture is composed of potassium laurate 15% , sodium dodecylbenzene sulfonate 23%, sodium lauryl sulfate 36%, sodium lignosulfonate 26%.), and then stirred for 30-45 minutes to mix evenly into a repair material.

[0029] The optimum moisture content of a lead-contaminated soil is 18.1%, and the minimum content of the remediation material for the contaminated soil is determined to be 7.3% by indoor compaction experiments. Use a rotary tiller to till the bottom layer of the contaminated soil at a specified depth, adjust the moisture content of the contaminated soil to the optimum moisture content of 22.1%; then calculate the total amount of phosphorus slag-based restoration materials added according to 9.3% of the dry weight of the contaminated soil, and spray the restoration materials e...

Embodiment 3

[0034] The ratio of phosphorus slag-based repair materials: 83% of phosphorus slag, 8% of boiling slag, 6% of petroleum coke desulfurization ash, 2% of cement kiln dust, 1.0% of admixture (the admixture is composed of 15% potassium laurate , sodium dodecylbenzene sulfonate 23%, sodium lauryl sulfate 36%, sodium lignosulfonate 26%.), and then stirred for 30-45 minutes to mix evenly into a repair material.

[0035] The optimal moisture content of a lead-contaminated soil is 19.6%, and the minimum content of the remediation material for the contaminated soil is determined to be 9.7% by indoor compaction experiments. Use a rotary tiller to till the bottom layer of the polluted soil to a specified depth, adjust the moisture content of the polluted soil to the optimum moisture content of 23.6%; then calculate the total amount of phosphorus slag-based restoration materials added according to 11.7% of the dry weight of the polluted soil, and spray the restoration materials evenly In t...

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Abstract

The invention provides a phosphorus slag-based repairing material for lead polluted soil. The phosphorus slag-based repairing material mainly comprises phosphorus slag, boiled slag, petroleum coke desulfurized ash, cement kiln ash and an additive. The phosphorus slag-based repairing material provided by the invention is applied to the lead polluted soil according to the following steps: adopting a rotary cultivator for rotary cultivating till reaching the bottom layer in appointed depth of the polluted soil, and then regulating the moisture content of the polluted soil to 4% by tedding or watering; uniformly spraying the phosphorus slag-based repairing material to the polluted soil according to the minimal dosage 2% of the repairing material for lead polluted soil containing; after 1 day, adopting a land leveler for leveling and then adopting a rubber-wheel road roller for rolling for 2-4 times, coating a membrane and maintaining under the moisture-maintaining and temperature-maintaining state; and accumulatively maintaining for more than 7 days, and then adopting the rotary cultivator for rotary cultivating, breaking and recovering the fluffy structure of the soil, thereby completing the repairing for the lead polluted soil. Compared with the application of the cement and phosphate materials, the application of the phosphorus slag-based repairing material for lead polluted soil according to the technical scheme of the invention has the advantages that the soil lead concentration is greatly reduced, the time is short and the continuous repairing can be realized.

Description

technical field [0001] The patent of the present invention relates to a phosphorus slag-based restoration material for lead-contaminated soil, which is mainly composed of phosphorus slag, mixed with a certain proportion of boiling slag, petroleum coke desulfurization ash, and cement kiln ash, and is added with certain additives to obtain rapid energy recovery. Phosphorous slag-based remediation materials for remediation of lead-contaminated soils. Background technique [0002] Lead is a heavy metal that is widely distributed in heavy metal-contaminated soils and has a strong accumulation capacity. Soil lead pollution mainly comes from mining, metal smelting and processing, IT manufacturing, domestic sewage discharge, sewage irrigation, sludge use, and the use and combustion of leaded gasoline. In China, the annual lead discharge is about 56,000 tons, and lead has become a soil One of the main elements of pollution. Most of the lead that enters the soil exists in the surfac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40
CPCB09C1/08C09K17/40
Inventor 黄绪泉姜明明赵小蓉刘吉军聂丹丹黄绪
Owner 湖北冉擎建设工程有限公司
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