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Ammonium oxalate modified phosphate tailing adsorbing material and preparation method and application thereof

A technology of adsorption materials and phosphorus tailings, applied in chemical instruments and methods, adsorption water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of single restoration mechanism and insufficient restoration efficiency to meet the high-concentration treatment needs and other problems, to achieve the effects of low preparation cost, improvement of soil physical and chemical properties, and good adsorption effect

Active Publication Date: 2020-09-08
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the invention patent with the published patent number CN 102559198 A discloses an oxalic acid-activated phosphate rock powder for treating heavy metal copper, lead, and cadmium polluted soil. After being applied to the soil, it can passivate heavy metals and increase soil fertility at a lower application rate. , but its repair mechanism is single, and the repair efficiency is not enough to meet the treatment needs of higher concentrations

Method used

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  • Ammonium oxalate modified phosphate tailing adsorbing material and preparation method and application thereof
  • Ammonium oxalate modified phosphate tailing adsorbing material and preparation method and application thereof
  • Ammonium oxalate modified phosphate tailing adsorbing material and preparation method and application thereof

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Effect test

Embodiment 1

[0028] Example 1 Preparation of Ammonium Oxalate Modified Phosphorus Tailings Adsorbent Material

[0029] Phosphorus tailings are collected to prepare ammonium oxalate modified phosphorous tailings adsorption material. The specific operation is as follows:

[0030] (1) Phosphorus tailings pretreatment

[0031] Phosphorus tailings obtained by flotation process after phosphate rock mining are collected, air-dried, ground and pulverized by a ball mill, passed through a 100-mesh nylon sieve, and the first sieve is taken to obtain phosphorous tailings powder (F).

[0032] (2) Preparation of ammonium oxalate modified phosphorus tailings adsorption material

[0033] Put 25.00 g of phosphorous tailings powder obtained in step (1) into a 500 mL plastic jar, and add 250 mL of ammonium oxalate solution with a concentration of 0.5 mol L-1 according to the solid-to-liquid ratio (W:V) of 1:10 , turn over and mix well, put it in a constant temperature incubator at 28°C for 6 days, take it...

Embodiment 2

[0038] Example 2 Adsorption effect of ammonium oxalate modified phosphorus tailings adsorption material on single existing lead, copper, cadmium, zinc and nickel

[0039] Using 0.01 mol L-1 sodium nitrate solution as a solvent, a single heavy metal solution with a lead ion, copper ion, zinc ion and nickel ion concentration of 1000 mg L-1 and a cadmium ion concentration of 500 mg L-1 was prepared respectively. Adjust the solution pH=5. Accurately weigh the ammonium oxalate modified phosphorus tailings adsorption material prepared in Example 1 and place it in a 15 mL centrifuge tube, and add a certain volume of lead, copper, cadmium, zinc and nickel single heavy metal solution at a solid-to-liquid ratio of 1:500 , and shake the centrifuge tube for 48 hours at 25°C and 180 r·min-1.

[0040] Such as figure 2 The results showed that the adsorption capacity of ammonium oxalate modified phosphorus tailings adsorption material to lead ion, copper ion, cadmium ion, zinc ion and nick...

Embodiment 3

[0041] Example 3 Adsorption effect of ammonium oxalate modified phosphorus tailings adsorption material on composite pollution of lead, copper, zinc and nickel

[0042]Using 0.01 mol·L-1 sodium nitrate solution as a solvent to prepare a complex heavy metal solution with a concentration of 1000 mg·L-1 lead ions, copper ions, zinc ions and nickel ions, the pH of the solution was adjusted to 5. Accurately weigh the ammonium oxalate-modified phosphorus tailings adsorption material prepared in Example 1 and place it in a 15 mL centrifuge tube, add a certain volume of composite heavy metal solution at a solid-to-liquid ratio of 1:500, and place the centrifuge tube at 25°C and 180 r Shake for 48 hours under min-1 conditions.

[0043] Such as image 3 As shown, the adsorption capacity of ammonium oxalate modified phosphorous tailings adsorption material to lead ion, copper ion, zinc ion and nickel ion in the composite heavy metal solution were 89 mg·g-1, 86 mg·g-1, 27 mg ·g-1 and 28...

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Abstract

The invention discloses an ammonium oxalate modified phosphate tailing adsorbing material for repairing heavy metal polluted water and soil and a preparation method and application thereof. The preparation method of the material comprises the following steps: mixing pretreated phosphate tailings with an ammonium oxalate solution, reacting the mixture at 25-35 DEG C for 4-8 days, drying the mixtureat 90-100 DEG C for 6-48 hours until the mixture is completely dried, cooling the dried mixture to room temperature, and grinding the cooled mixture to obtain the material. The preparation method ofthe material is simple in process, simple in required equipment and low in preparation cost. The ammonium oxalate modified phosphate tailings not only can adsorb heavy metal ions such as lead, copper,cadmium, zinc and nickel in a solution and treat water pollution, but also can passivate heavy metals such as lead and cadmium in heavy metal contaminated soil, reduce the effectiveness of the heavymetals and improve the physicochemical properties of the soil, and have a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of heavy metal pollution control and restoration, and more specifically relates to an ammonium oxalate modified phosphorus tailings adsorption material for repairing heavy metal polluted water and soil, a preparation method and an application thereof. Background technique [0002] With the rapid development of industrialization and urbanization, human activities such as industrial wastewater, waste residue and exhaust gas discharge, metal mining and smelting, pesticide and pesticide use have caused a large amount of heavy metals to enter water bodies and soils, causing heavy metal pollution. Heavy metal pollution is highly toxic, persistent and non-degradable, which poses a serious threat to the ecological environment and human health. At present, the commonly used methods for remediating heavy metal-contaminated water and soil are chemical adsorption and chemical passivation, which mainly adjust the physica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/30C02F1/28B09C1/08C02F101/20
CPCB01J20/223C02F1/281B09C1/08C02F2101/20
Inventor 蔡超刘昭范家俊侯艳伟朱永官李云驹
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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