Preparation method of acid activated palygorskite-based soil heavy metal passivation material

A technology of palygorskite clay and palygorskite, applied in the direction of soil conditioning materials, chemical instruments and methods, organic fertilizers, etc., can solve the problems of increasing and increasing the amount of palygorskite, waste consumption of palygorskite, etc. To achieve the effect of easy crushing

Inactive Publication Date: 2017-07-25
LANZHOU KUNLUN ENVIRONMENTAL PROTECTION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing palygorskite-based heavy metal passivation materials are only crushed, mixed, and directly put into use after simple modification treatment. The actual use effect of palygorskite is limited. In order to achieve the purpose of soil pollution restoration, it is necessary to continuously increase the amount of palygorskite. Lead to increased waste and consumption of palygorskite

Method used

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  • Preparation method of acid activated palygorskite-based soil heavy metal passivation material
  • Preparation method of acid activated palygorskite-based soil heavy metal passivation material
  • Preparation method of acid activated palygorskite-based soil heavy metal passivation material

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preparation example Construction

[0027] A preparation method for acid-activated palygorskite-based soil heavy metal passivation material, comprising the following steps:

[0028] A. to dry naturally

[0029] The palygorskite ore is dried in the sun for 3-7 days to prevent rainwater from soaking the palygorskite;

[0030] B. Crushed and sieved

[0031] The palygorskite ore is crushed into palygorskite clay, and the palygorskite clay is sieved with a filter mesh of 150-200 mesh;

[0032] C. Alkaline chelation

[0033] Mix palygorskite clay with sulfuric acid solution and stir to make it evenly mixed;

[0034] D. Precipitation, drying and crushing

[0035] The mixed solution is allowed to stand for precipitation, and the precipitate is dried and crushed to obtain the finished product.

[0036] Preferably, in the step C, palygorskite clay and sulfuric acid solution are mixed at a solid-to-liquid ratio of 1:10, and the mass concentration of the sulfuric acid solution is 2.5-20%, and stirred for 12-108 h at a ...

Embodiment 1

[0042] A preparation method for acid-activated palygorskite-based soil heavy metal passivation material, comprising the following steps:

[0043] A. to dry naturally

[0044] The palygorskite ore is dried in the sun for 3-7 days to prevent rainwater from soaking the palygorskite;

[0045] B. Crushed and sieved

[0046] The palygorskite ore is crushed into palygorskite clay, and the palygorskite clay is sieved with a filter mesh of 150-200 mesh;

[0047] C. Alkaline chelation

[0048] Palygorskite clay and sulfuric acid solution are mixed at a solid-to-liquid ratio of 1:10, the mass concentration of the sulfuric acid solution is 2.5-20%, and stirred for 12-108 hours at a stirring speed of 500 r / min to make it evenly mixed;

[0049] D. Precipitation, drying and crushing

[0050] The mixed solution is left to settle, and the precipitate is dried at 70°C and crushed to obtain a finished product.

Embodiment 2

[0052] A preparation method for acid-activated palygorskite-based soil heavy metal passivation material, comprising the following steps:

[0053] A. to dry naturally

[0054] The palygorskite ore is dried in the sun for 3-7 days to prevent rainwater from soaking the palygorskite;

[0055] B. Crushed and sieved

[0056] The palygorskite ore is crushed into palygorskite clay, and the palygorskite clay is sieved with a filter mesh of 150-200 mesh;

[0057] C. Alkaline chelation

[0058] Palygorskite clay and sulfuric acid solution were mixed at a solid-to-liquid ratio of 1:10, the mass concentration of the sulfuric acid solution was 2.5-20%, and stirred for 72 hours at a stirring speed of 500 r / min to make it evenly mixed;

[0059] D. Precipitation, drying and crushing

[0060] The mixed solution is left to settle, and the precipitate is dried at 70°C and crushed to obtain a finished product.

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Abstract

The invention relates to the technical fields of environmentally friendly materials and preparation methods thereof, and especially relates to a preparation method of an acid activated palygorskite-based soil heavy metal passivation material. Palygorskite clay is widely used nonmetallic clay mineral in heavy metal polluted soil repairing at present, is a rich mineral resource in China, has low price, can adsorb harmful and various organic and inorganic pollutants, does not generate secondary pollution, and has the advantages incomparable to other nonmetallic minerals. After the acidification treatment of the palygorskite clay is carried out, impurities are removed from the palygorskite clay, aggregated crystal beams are dispersed, octahedral cations are gradually dissolved, and microporous channels are expanded, so the purification purpose of the palygorskite clay is reached, the specific surface area is improved, and the adsorption performance and the ion exchange capacity are promoted, thereby the acidified palygorskite clay has more application values and economy values than the untreated palygorskite clay.

Description

technical field [0001] The invention relates to the technical field of environment-friendly materials and their preparation, in particular to a method for preparing an acid-activated palygorskite-based soil heavy metal passivation material. Background technique [0002] Soil is the main natural resource that human beings rely on for survival, and it is also an important part of the human ecological environment. With the rapid development of industry and agriculture, the pollution of heavy metals in the soil-plant-environment system is becoming more and more serious. [0003] my country has conducted research and demonstration on heavy metal-contaminated soil remediation technology, and has begun the implementation of heavy metal-contaminated soil remediation projects. The main technologies include barrier landfill, solidification / stabilization, phytoremediation, soil cleaning, thermal analysis and electrodynamic remediation. Among them, the first three technologies have suc...

Claims

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Application Information

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IPC IPC(8): C09K17/04C09K17/08C09K101/00
CPCC09K17/04C09K17/08C09K2101/00
Inventor 任珺陶玲王玉君汪孔泉杜昊霖
Owner LANZHOU KUNLUN ENVIRONMENTAL PROTECTION TECH
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