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Heavy metal aggregating fixative for soil remediation and preparation method thereof

A technology for repairing soil and heavy metals, applied in soil conditioning materials, chemical instruments and methods, organic fertilizers, etc., to achieve the effects of simple preparation methods, wide sources, and low prices

Active Publication Date: 2017-11-24
浙江中地净土科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In view of the deficiencies of the existing heavy metal-contaminated soil prevention and control technology proposed above, the present invention proposes a heavy metal aggregation fixative for repairing soil. Its notable feature is that it can not only collect heavy metals in the soil, but also collect The ions are enriched into large particles, thereby forming a stable heavy metal aggregation state with large particles, effectively preventing heavy metals from re-dispersing in the soil

Method used

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  • Heavy metal aggregating fixative for soil remediation and preparation method thereof

Examples

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Embodiment 1

[0033] A method for preparing a heavy metal aggregation fixative for repairing soil, comprising the following steps:

[0034] (1) Step 1: crushing and refining, crushing and refining 40 parts by weight of alfalfa until passing through a 10-mesh sieve for later use;

[0035] (2) Step 2: Drying. Air-dry the crushed alfalfa in the above step 1 at a temperature of 45°C~70°C until the moisture content is less than 15%, and use a screw extruder at a temperature of 100-120°C. Puffing, forming colloidal micropores;

[0036] (3) Step 3: Preparation, add 15 parts by weight of calcium hydrogen phosphate and 20 parts by weight of calcium hydroxide to the above-mentioned puffed alfalfa, mix at 120 rpm for 15-20 minutes, and then add an appropriate amount of Adhesive xanthan gum liquid is used to uniformly adhere thinned alfalfa grass to calcium hydrogen phosphate and calcium hydroxide, and then a heavy metal aggregation fixative for repairing soil is prepared through pellets.

Embodiment 2

[0038] A method for preparing a heavy metal aggregation fixative for repairing soil, comprising the following steps:

[0039] (1) Step 1: crushing and refining, crushing and refining 50 parts by weight of the protein material soybean oil residue until passing through a 10-mesh sieve for later use;

[0040] (2) Step 2: Drying, air-dry the crushed and refined soybean oil residue in the above step 1 at a temperature of 45°C~70°C until the moisture content is lower than 15%, and use a screw extruder at 100-120°C Puffing, forming colloidal micropores;

[0041] (3) Step 3: Preparation, add 10 parts by weight of calcium hydroxyphosphate and 20 parts by weight of calcium hydroxide to the above-mentioned puffed soybean oil dregs, mix at a speed of 120 rpm for 20 minutes, and then add an appropriate amount of cellulose ether Glue, so that soybean oil dregs, phosphate, calcium hydroxide uniformly adhered, and then the heavy metal aggregation fixative for repairing soil was prepared by p...

Embodiment 3

[0043] A method for preparing a heavy metal aggregation fixative for repairing soil, comprising the following steps:

[0044] (1) Step 1: crushing and refining, crushing and refining 80 parts by weight of pea straw until passing through a 10-mesh sieve for later use;

[0045] (2) Step 2: Drying. Air-dry the pea straw crushed and refined in the above step 1 at a temperature of 45°C~70°C until the moisture content is lower than 15%, and use a screw extruder at a temperature of 100-120°C. Puffing, forming colloidal micropores;

[0046] (3) Step 3: Preparation, add 15 parts by weight of TSP and 5 parts by weight of calcium hydroxide to the above-mentioned puffed pea straw, mix at 120 rpm for 15-20 minutes, then add An appropriate amount of water glass adhesive is used to uniformly adhere pea stalks to heavy superphosphate and calcium hydroxide, and then a heavy metal aggregation fixative for repairing soil is prepared through granulation.

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Abstract

The invention provides a heavy metal aggregating fixative for soil remediation and a preparation method thereof. The heavy metal aggregating fixative for the soil remediation is obtained by grinding and refining raw materials rich in plant protein, and expanding after drying, and preparing with phosphate and calcium dioxide and granulating according to a certain proportion. The heavy metal aggregating fixative for the soil remediation has the obvious characteristics that after phosphate and calcium hydroxide collect heavy metal ions, large-particle protein materials are used and protein functional groups are preferentially combined with the heavy metal ions after the large-particle protein materials are expanded, the heavy metal ions and a protein spatial structure react to form a large aggregate, eventually, a tubercular substance is formed, so that heavy metal is fixed in the protein materials in the form of large particles to permanently fix the heavy metal ions in soil, and the process is irreversible, namely the heavy metal ions which are fixed by the way are no longer likely to have secondary loss basically.

Description

technical field [0001] The invention relates to the field of prevention and control of metal-polluted soil, in particular to a heavy metal aggregation fixative for repairing soil and a preparation method. Background technique [0002] Over the past 30 years, with the rapid development of national industrialization, urbanization, and highly intensified agriculture, the problem of soil pollution in my country has become prominent. According to the survey, the current rate of the country's total soil points exceeding the standard is 16.1%, and the area of ​​moderately and severely polluted cultivated land is as high as 50 million mu; the soil pollution in the relocation sites of industrial enterprises is generally serious; the hidden dangers of soil environmental safety in mining areas, oil fields and drinking water source areas are alarming Concern; soil pollution has taken on a watershed and regional trend, and the hidden dangers of soil pollution in Southwest China are parti...

Claims

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Application Information

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IPC IPC(8): C09K17/40C09K101/00
CPCC09K17/40C09K2101/00
Inventor 陈庆曾军堂陈兵
Owner 浙江中地净土科技有限公司
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