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A kind of improver and its preparation method and application

A modifier and modification technology, applied in the fields of application, chemical instruments and methods, and other chemical processes, can solve problems such as large changes in soil pH, poor adsorption of cadmium and arsenic, and complex components of modifiers. Obvious effect, few components, good curing and stabilizing effect

Active Publication Date: 2020-09-29
BCEG ENVIRONMENTAL REMEDIATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Therefore, the technical problem to be solved by the present invention is to overcome the shortcomings of the prior art, such as complex components of the modifier, high cost, poor adsorption effect on cadmium and arsenic, and the addition of the modifier will lead to large changes in soil pH, thereby providing a A kind of improver and its preparation method and application

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  • A kind of improver and its preparation method and application
  • A kind of improver and its preparation method and application
  • A kind of improver and its preparation method and application

Examples

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Effect test

Embodiment 1

[0032] This embodiment provides a cadmium-arsenic compound polluted soil remediation improver, including the following components, modified vermiculite 40kg, modified biochar 30kg and modified sepiolite 30kg;

[0033] The preparation method of above-mentioned improver comprises the following steps:

[0034] After mixing and stirring the modified vermiculite, modified biochar and modified sepiolite for 1 hour, the modifier is obtained;

[0035]Among them, the modification method of vermiculite includes mixing vermiculite and 0.01mol / L hydrochloric acid uniformly at a solid-to-liquid ratio of 1:10, shaking at 80°C for 1 hour, centrifugally separating hydrochloric acid and vermiculite, and then Add deionized water to the vermiculite and repeat washing, centrifugal 3 times, dry, crush and sieve 100 mesh, obtain modified vermiculite;

[0036] The modification method of biochar comprises that corn stalks are subjected to airtight treatment at 400°C to obtain a biochar precursor, an...

Embodiment 2

[0041] This embodiment provides a cadmium-arsenic compound polluted soil remediation improver, including the following components, modified vermiculite 60kg, modified biochar 20kg and modified sepiolite 20kg;

[0042] The preparation method of above-mentioned improver comprises the following steps:

[0043] After mixing and stirring the modified vermiculite, modified biochar and modified sepiolite for 1.2 hours, the modifier was obtained;

[0044] Among them, the modification method of vermiculite includes mixing vermiculite and 0.02mol / L hydrochloric acid uniformly at a solid-to-liquid ratio of 1:10, shaking at 90°C for 2 hours, centrifugally separating hydrochloric acid and vermiculite, and then After adding deionized water to the vermiculite for repeated washing and centrifugation for 5 times, it was dried, crushed and sieved with 100 mesh to obtain modified vermiculite;

[0045] The modification method of biochar comprises that the rice straw is subjected to airtight trea...

Embodiment 3

[0049] This embodiment provides a cadmium-arsenic compound polluted soil remediation improver, including the following components, modified vermiculite 50kg, modified biochar 25kg and modified sepiolite 24kg;

[0050] The preparation method of above-mentioned improver comprises the following steps:

[0051] After mixing and stirring the modified vermiculite, modified biochar and modified sepiolite for 0.8 hours, the modifier was obtained;

[0052] Among them, the modification method of vermiculite includes mixing vermiculite and 0.01mol / L hydrochloric acid uniformly at a solid-to-liquid ratio of 1:10, shaking at 70°C for 1.5h, centrifugally separating hydrochloric acid and vermiculite, and then separating The final vermiculite was repeatedly washed with deionized water and centrifuged for 4 times, then dried, pulverized and sieved with 100 mesh to obtain modified vermiculite;

[0053] The modification method of biochar comprises that the wheat straw is subjected to airtight t...

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Abstract

The invention belongs to the technical field of soil protection, and particularly relates to a cadmium-arsenic compound contaminated soil restoration amendment agent and a preparation method and application thereof. The provided amendment agent comprises modified vermiculite, modified bio-char and modified sepiolite, has simple composition and good adsorption effect, can maintain the pH of the soil in a relatively stable range, and can effectively reduce the variation amplitude of the soil pH, the comprehensive restoration of the cadmium-arsenic compound pollution can be achieved through the compounding of the three materials, and the soil fertility is not affected. The modified vermiculite has relatively high pH buffering ability, so that the problem that sepiolite tends to increase the pH value of the soil and the iron-modified bio-char tends to lower the pH value of the soil can be slowed down. The bio-char is rich in functional groups, and the iron-modified bio-char has relativelygood curing and stabilizing effects on arsenic. The sepiolite is a chain-like transition structure composed of parallel crystal layers, the adjacent crystal layers are arranged alternately to form micro-porous channels, so that the sepiolite has strong adsorption, decolorization, dispersion and other properties.

Description

technical field [0001] The invention belongs to the technical field of soil protection, and in particular relates to a cadmium-arsenic compound polluted soil remediation improver and its preparation method and application. Background technique [0002] According to the results of the national soil pollution survey, the national soil pollution is dominated by inorganic pollutants, and the number of points exceeding the standard of inorganic pollutants accounts for 82.8% of the total number of points exceeding the standard. The main substances causing inorganic pollution are cadmium, nickel, arsenic, copper, mercury, lead, chromium and zinc. 1.5%, 1.1% and 0.9%, the type of pollutant composition usually manifests as complex pollution of various heavy metals, and compound pollution of cadmium and arsenic is the most typical and extensive type. [0003] Cadmium and arsenic in soil can be transmitted, accumulated and amplified through the food chain and ecological chain, threate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/12C09K101/00C09K109/00
CPCC09K17/12C09K2101/00C09K2109/00
Inventor 熊静郭丽莉王祺惠霂霖李书鹏陈有鑑何玮淑宋倩
Owner BCEG ENVIRONMENTAL REMEDIATION CO LTD
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