Method for preparing arsenic-cadmium passivator, arsenic-cadmium passivator prepared through method and application

A passivator and activator technology, which is applied in the field of arsenic and cadmium passivators and the preparation of arsenic and cadmium passivators, can solve the problem that arsenic and cadmium cannot be passivated efficiently at the same time, achieve good curing stability, overcome easy loss, and achieve good results. long lasting effect

Active Publication Date: 2019-01-11
通化海汇龙洲化工有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The arsenic and cadmium passivator of the present invention mainly solidifies the heavy metal arsenic and cadmium through ion exchange, precipitation, co-precipitation, adsorption and wrapping, so as to ensure the lasting and stable effect of solidified arsenic and cadmium, and solve the problem of arsenic (trivalent arsenic / pentavalent arsenic), cadmium Technical difficulties that cannot be simultaneously and efficiently passivated

Method used

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  • Method for preparing arsenic-cadmium passivator, arsenic-cadmium passivator prepared through method and application
  • Method for preparing arsenic-cadmium passivator, arsenic-cadmium passivator prepared through method and application
  • Method for preparing arsenic-cadmium passivator, arsenic-cadmium passivator prepared through method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The preparation of embodiment 1 arsenic cadmium passivator

[0041] Mix 100g feldspar, 220g limestone, 12g ferric sulfate, 9g magnesite and 8g sodium sulfate and grind to 200 mesh, roast at 1200°C for 2.0h, cool and pulverize, roast clinker, K 2 FeO 4 and MnSO 4 Add water at a mass ratio of 7.3:0.9:1, adjust the pH of the system between 6 and 10, and react for 1.5 hours, then filter, and dry the obtained solid at 100°C to obtain a passivator.

[0042] In the prepared passivator, effective silicon is 25.5wt% (citrate soluble, with SiO 2 ), the available calcium is 42.8wt% (calculated as CaO), and the iron content is 4.21wt% (calculated as Fe 2 o 3 In terms of), the manganese content is 6.88% (as MnO 2 ), the contents of harmful elements Hg, As, Cd, Pb, and Cr are 0.5mg / kg, 3.26mg / kg, 2.14mg / kg, 10.35mg / kg, and 9.57mg / kg respectively, in line with the agricultural industry standard "NY 1110- 2010 Limit requirements for mercury, arsenic, cadmium, lead, and chromium i...

Embodiment 2

[0043] The preparation of embodiment 2 arsenic cadmium passivator

[0044] Mix 100g of illite, 200g of calcium carbonate, 15g of iron sulfate, 6g of magnesium sulfate and 7g of potassium sulfate and grind them to 250 mesh, roast at 1250°C for 1.5h, cool and pulverize, roast clinker, FeSO 4 ·7H 2 O and KMnO 4 Add water at a mass ratio of 30:5.2:1, adjust the pH of the system between 6 and 10, and react for 1.0 h, then filter, and dry the obtained solid at 102°C to obtain a passivator.

[0045] In the prepared passivator, effective silicon is 26.8wt% (citrate solubility, with SiO 2 ), the available calcium is 40.5wt% (calculated as CaO), and the iron content is 4.58wt% (calculated as Fe 2 o 3 In terms of), the manganese content is 1.66wt% (as MnO 2 ), the contents of harmful elements Hg, As, Cd, Pb, and Cr are 1.2mg / kg, 2.15mg / kg, 1.04mg / kg, 8.32mg / kg, and 10.85mg / kg respectively, in line with the agricultural industry standard "NY 1110- 2010 Limit requirements for mercury...

Embodiment 3

[0046] Embodiment 3 adopts passivating agent to control arsenic and cadmium composite polluted site soil

[0047] Soil for test: the soil of an arsenic and cadmium complex polluted site in Changde City, Hunan Province. The total arsenic content in the soil is 1017mg / kg, and the total cadmium content is 205mg / kg.

[0048] Passivator: the passivator prepared in Example 1.

[0049] The specific repair test method is as follows:

[0050] (1) Air-dry the arsenic-cadmium composite polluted soil, grind it through a 20-mesh sieve, take two parts of 100g of the under-sieve and place it in a beaker, and treat it as a blank control without adding a passivating agent. In the treatment 1, passivating agent / ( The mass ratio of As+Cd) is 150 to add passivating agent, fully mix;

[0051] (2) adding a pH regulator aqueous solution to adjust the pH to 6-9, and adding water to keep the soil moisture content at 32%;

[0052] (3) Seal with a plastic film, and set a plurality of small holes to e...

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Abstract

The invention provides a method for preparing an arsenic-cadmium passivator, the arsenic-cadmium passivator prepared through the method and an application. The preparation method comprises the following steps that an aluminosilicate material is mixed with an activating agent and a fluxing agent, and then undergoes high-temperature roasting treatment; the roasted material, ferric salt and manganesesalt are added into water, and the system pH value is adjusted for reaction; and solid-liquid separation is performed, the obtained solid is dried to obtain the passivator. The passivator is a novelpassivator which is efficient, environment-friendly, low in cost and capable of being used for treating soil (such as a farmland and a field), waste residues or water bodies with arsenic and cadmium contents exceeding the standard, the technological difficulty that arsenic (trivalent arsenic / pentavalent arsenic) and cadmium cannot be efficiently passivated at the same time is solved, and the passivator and the method have very good popularization and application values.

Description

technical field [0001] The invention belongs to the technical field of arsenic and cadmium composite pollution control, and specifically relates to a method for preparing an arsenic and cadmium passivator, the arsenic and cadmium passivator prepared by the method, and its application and usage method. Background technique [0002] Arsenic and cadmium are extremely toxic environmental pollution elements. Together with mercury, chromium, and lead, they are called the five environmental poisons, and their pollution hazards have become a global environmental problem. Arsenic exists in the environment mainly in the inorganic form (As 2 o 3 and H 3 AsO 3 etc.) and organic forms (for example, monomethylarsenic acid (MMA) and dimethylarsenic acid (DMA), etc.) exist, of which inorganic arsenic accounts for the main part. Inorganic arsenic can be divided into As(III) and As(V) according to the valence state. Studies have shown that the toxicity of As(III) is more than 60 times th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/00C09K17/06C02F1/42C02F1/52C02F1/28C05G3/04C09K109/00C05G3/80
CPCB09C1/00B09C1/08B09C2101/00C02F1/281C02F1/42C02F1/5236C05D1/04C09K17/06C09K2109/00C05G3/80C05D3/02C05D5/00C05D9/00C05D9/02
Inventor 刘耀驰王程程曹正海钟楚彬赖学明王杨王丽萍
Owner 通化海汇龙洲化工有限公司
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