Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for processing organic compounds in soil through tailings

A technology for organic compounds and tailings, applied in chemical instruments and methods, restoration of polluted soil, catalysts for physical/chemical processes, etc. The effect of oxidation efficiency, rapid reaction and strong adsorption capacity

Active Publication Date: 2019-05-24
HEBEI UNIV OF TECH
View PDF5 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the traditional Fenton oxidation reaction, the catalyst is Fe 2+ , and need to be in a strong acid medium to continuously produce OH, so a large amount of acidic substances should be added to adjust the pH value before treating the contaminated soil, but the soil has a strong slow-release ability, it is difficult to adjust the pH, and acidification can easily lead to soil function The loss of soil microorganisms and other problems, it is not easy to implement on a large scale

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for processing organic compounds in soil through tailings
  • Method for processing organic compounds in soil through tailings
  • Method for processing organic compounds in soil through tailings

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0045] 2) Preparation of alkali-melted clinker: Weigh the alkali solid particle NaOH or KOH according to the mass ratio of 1:1.2 to 1:1.5, mix with the tailings treated in step 1) and grind evenly, then add a certain amount of aluminum compound Powder Al(OH) 3into the mixture, adjust the Si / Al ratio in the mixture to 1.0, and then place it in a nickel phase pot and bake at 680-720°C for 120-180min to obtain alkali-melted clinker.

[0046] 3) Hydrothermal synthesis: After the alkali-melted clinker in step 2) is cooled to room temperature, grind it into fine particles, add deionized water to mix evenly and stir and age. The liquid-solid ratio of deionized water to alkali-melted clinker is 6:1 ~8:1, then pour the mixture into a stainless steel reactor with polytetrafluoroethylene lining, heat it in water at 100~120°C for 4~6h, take it out and cool it to room temperature naturally, then filter and wash with deionized water for 3~5 times, and then placed in a drying oven at 50-80°...

Embodiment 1

[0063] Tailings molecular sieves were prepared from iron tailings. The specific steps are:

[0064] The first step: tailings pretreatment. Use 100ml of dilute sulfuric acid with a mass fraction of 60% to fully mix and stir with 30g iron tailings at room temperature for 1 hour, filter and dry, put the acid-washed tailings into a muffle furnace, heat at 1000°C for 40 minutes, and then cool to room temperature (The iron-containing filtrate is for later use). The second step: the preparation of alkaline clinker. Weigh 20g of NaOH solid particles with a particle size range of 80-100 mesh and 25g of pretreated iron tailings, mix and grind evenly for 30min, then add a certain amount of Al(OH) 3 Continue grinding in the mixture for 30 minutes to adjust the molar ratio of Si / Al in the mixture to 1.0, then place it in a nickel phase pot and bake at 700°C for 150 minutes, and cool to room temperature to obtain alkali-fused clinker. The third step: hydrothermal synthesis. Finely grin...

Embodiment 2

[0066] at 1m 2 Experiments were carried out in soil polluted by polycyclic aromatic hydrocarbons (the concentration of polycyclic aromatic hydrocarbons is 8mg / L), and 0.8Kg of iron scraps sieved to 45 meshes, 16Kg of iron ore molecular sieves, 4.0Kg of deionized water, and a mass percentage concentration of 16L of 30% The sodium persulfate solution was sequentially injected into the contaminated soil through the injection tube, the injection depth was 50cm, and the reaction time was 24h. The organic matter was extracted from the soil using HJ 783-2016, and the removal rate of polycyclic aromatic hydrocarbons was tested according to the HJ 784-2016 standard. The results showed that the removal rate of PAHs was 90.2%. Utilize Fe from acid washing from iron tailings 3+ Fe formed by reaction with iron filings 2+ React with sodium persulfate, so that both iron filings react with sodium persulfate and Fe 2+ React with sodium persulfate to achieve better removal effect.

[0067] ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Particle sizeaaaaaaaaaa
Qualityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for processing organic compounds in soil through tailings. The method comprises the following steps of 1, preparing a tailing molecular sieve, wherein the tailings arepreprocessed, then, alkali fusion clicker is prepared, then, deionized water is added for a hybrid reaction, and a finished tailing molecular sieve is obtained; 2, loading Fe3+ ions, wherein the finished tailing molecular sieve is added into an iron-containing filtrate obtained in tailing preprocessing, calcinating is performed for 2 h under the temperature of 550 DEG C after drying is performed,cooling is performed to reach room temperature, and an iron loaded iron ore molecular sieve is obtained; 3, synthesizing a repairing agent, wherein scrap iron, the tailing molecular sieve and sodiumpersulfate are sequentially added to the same position inside the contaminated soil for an oxidation reaction for 3-24 h, and soil with no organic contamination is obtained. The method can achieve tailing recycling and can also avoid obvious changes of the soil pH value, and the higher removal rate of organic compounds in soil is obtained.

Description

technical field [0001] The invention relates to the technical field of molecular sieve preparation and contaminated soil treatment, in particular to a method for oxidizing organic compounds in soil. Background technique [0002] Zeolite molecular sieves have been widely used as adsorbents and catalyst supports for various materials due to their uniform pore size, large specific surface area and high adsorption capacity. Zeolite molecular sieves can be synthesized using various sources of pure silicon, such as tetraethyl orthosilicate (TEOS), n-alkoxysilanes and sodium silicates. However, these pure silicon sources are usually expensive, and the resulting zeolite molecular sieves have low catalytic activity and poor adsorption capacity, but can be obtained by introducing impurity atoms (for example, Al, Fe, Ti, and Ni) into the tetrahedral framework or in the Deposit suitable metal oxides (e.g., TiO 2 , CeO 2 , Fe 2 o 3 and Mn 2 o 3 ) to improve. Simultaneously using ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B01J20/18B01J20/30B01J29/072B01J32/00B09C1/00B09C1/08
Inventor 薛刚赵光远梁金生罗雄一王丽银
Owner HEBEI UNIV OF TECH