Method for preparing soil heavy metal solidification material by using oil shale semi-coke

A technology for oil shale semi-coke and solidified materials, applied in the field of waste resource reuse, can solve the problems of low added value, limited utilization, environmental pollution, etc., and achieve good ecological and economic benefits.

Active Publication Date: 2019-04-12
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the utilization of these utilization methods is limited and the added value is low, and there are serious environmental pollution problems at the same time.

Method used

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  • Method for preparing soil heavy metal solidification material by using oil shale semi-coke
  • Method for preparing soil heavy metal solidification material by using oil shale semi-coke
  • Method for preparing soil heavy metal solidification material by using oil shale semi-coke

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Effect test

Embodiment 1

[0021] The crushed oil shale semi-coke was subjected to wet grinding under the condition of solid-liquid mass ratio of 1:10, passed through a 200-mesh sieve, and then activated by adding 10% sulfuric acid (concentration: 5%) of semi-coke mass for 3 hours, and then used Plate-and-frame filter press dehydration until the moisture content of the filter cake is less than 50%, then send it into the rotary kiln with twin-screws, and calcine at 300°C for 1 hour under a nitrogen atmosphere, crush and sieve to obtain the product. The cured material is Cd 2+ , Pb 2+ and Cu 2+ The adsorption capacity of these materials reaches about 180mg / g, 130mg / g and 100mg / g respectively.

Embodiment 2

[0023] The crushed oil shale semi-coke was subjected to wet grinding under the condition of solid-liquid mass ratio of 1:10, passed through a 200-mesh sieve, and activated by adding sulfuric acid (concentration 3%) with 8% mass of semi-coke for 2 hours, and then used Plate-and-frame filter press dehydration until the moisture content of the filter cake is less than 50%, sent to the rotary kiln with twin-screws, calcined at 400°C for 2 hours in a nitrogen atmosphere, crushed, and sieved to obtain the product. The cured material is Cd 2+ , Pb 2+ and Cu 2+ The adsorption capacity of these materials reaches about 183mg / g, 99mg / g and 130mg / g respectively.

Embodiment 3

[0025] The crushed oil shale semi-coke was wet ground under the condition of solid-liquid mass ratio of 1:15, passed through a 200-mesh sieve; 3% sulfuric acid (concentration: 10%) by mass of the semi-coke was added for acid activation treatment for 3 hours, and then used Plate-and-frame filter press dehydration until the moisture content of the filter cake is less than 50%, sent to the rotary kiln with twin screws, calcined at 500°C for 3 hours in a nitrogen atmosphere, crushed, and sieved to obtain the product. The cured material is Cd 2+ , Pb 2+ and Cu 2+ The adsorption capacity of these materials reaches about 160mg / g, 120mg / g and 110mg / g respectively.

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Abstract

The invention discloses a method for preparing a soil heavy metal solidification material by using oil shale semi-coke, which comprises the following steps of: crushing oil shale semi-coke, then carrying out wet grinding, sieving through 200 meshes, adding acid liquor for acid activation treatment, carrying out pressure filtration and dehydration, and then sending the product into a rotary kiln byusing a double screw, calcining in nitrogen atmosphere, pulverizing, and sieving to obtain the final product. According to the invention, the adsorption sites of heavy metal ions can be increased andthe adsorption capacity can be improved by activating mineral silica chemical bonds in the semi-coke through acid treatment; the micro-pore and mesoporous structures in the semi-coke are activated through calcination treatment; meanwhile, organic components are converted into active carbon, and the adsorption performance of heavy metal ions is further improved. The method not only achieves resource utilization of the oil shale semi-coke waste residue, but also can be used for passivating heavy metals in soil, and has good ecological benefit and economic benefit.

Description

technical field [0001] The invention relates to a method for preparing soil heavy metal solidified material, in particular to a method for preparing soil heavy metal solidified material by using oil shale semi-coke, which belongs to the field of waste resource reuse. technical background [0002] Soil heavy metal pollution has become a global environmental pollution problem. At present, the common heavy metal contaminated soil remediation technologies mainly include physical remediation, chemical remediation, biological remediation and agricultural regulation technology. Among them, chemical passivation / immobilization technology is widely used because it can quickly and significantly reduce the bioavailability and toxicity of heavy metals. Passivation technology mainly relies on passivating agents to reduce the mobility and bioavailability of heavy metals in soil, and make them exist in soil in a more stable form. At present, materials that can be used as heavy metal passi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C09K17/02
CPCB01J20/20C09K17/02
Inventor 宗莉王爱勤朱永峰牟斌
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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