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Preparation of m from feedwater sludge 2+ -al 3+ -fe 3+ Methods and applications of hydrotalcite-like materials

A technology for water supply sludge and hydrotalcite, which is applied in the field of waste recycling, can solve the problems of less research on recycling and utilization, and achieve the effects of less reaction steps, low energy consumption and small equipment investment.

Active Publication Date: 2022-03-29
BAOJI UNIV OF ARTS & SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are few studies on the recycling and utilization of compounds containing a large number of elements such as aluminum and iron in feedwater sludge.

Method used

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  • Preparation of m from feedwater sludge <sup>2+</sup> -al <sup>3+</sup> -fe <sup>3+</sup> Methods and applications of hydrotalcite-like materials
  • Preparation of m from feedwater sludge <sup>2+</sup> -al <sup>3+</sup> -fe <sup>3+</sup> Methods and applications of hydrotalcite-like materials
  • Preparation of m from feedwater sludge <sup>2+</sup> -al <sup>3+</sup> -fe <sup>3+</sup> Methods and applications of hydrotalcite-like materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1: Zn 2+ -Al 3+ -Fe 3+ Preparation of hydrotalcite-like

[0033] Step 1. Acidification of Feedwater Sludge

[0034] Grind and sieve the feedwater sludge sample, weigh 0.5008g feedwater sludge and place it in a 100mL beaker, add 5-10mL deionized water to it, adjust the pH of the sample to 1 with 14% dilute hydrochloric acid, and wrap the beaker with plastic wrap The mouth is sealed, and it is placed on a magnetic stirrer and stirred for 4 hours, so that the amorphous ferric hydroxide and aluminum hydroxide in the sample are dissolved and converted into Fe 3+ and Al 3+ .

[0035] Step 2, adding divalent metal ions and precipitating agent

[0036] Dilute the slurry obtained in step 1 to 100mL and transfer it to a 120mL reactor, add zinc nitrate hexahydrate 2.8645g, urea 1.7331g, control positive divalent cations (Zn 2+ ): Positive trivalent cation (Al 3+ and Fe 3+ ): Urea (H 2 NCONH 2 ) in a molar ratio of 3:1:9. The reaction kettle was placed in a homo...

Embodiment 2

[0041] Example 2: Ni 2+ -Al 3+ -Fe 3+ Preparation of hydrotalcite-like

[0042] Step 1. Acidification of Feedwater Sludge

[0043] Grind and sieve the feedwater sludge sample, weigh 0.4321g feedwater sludge and place it in a 100mL beaker, add 5-10mL deionized water to it, adjust the pH of the sample to 1 with 14% dilute hydrochloric acid, and wrap the beaker with plastic wrap The mouth is sealed, and it is placed on a magnetic stirrer and stirred for 4 hours, so that the amorphous ferric hydroxide and aluminum hydroxide in the sample are dissolved and converted into Fe 3+ and Al 3+ .

[0044] Step 2, adding divalent metal ions and precipitating agent

[0045] Step 1 gained slurry is diluted to 100mL and is transferred in the reactor of 120mL, adds nickel nitrate hexahydrate 2.4158g, urea 1.4954g, controls positive divalent cation (Ni 2+ ): Positive trivalent cation (Al 3+ and Fe 3+ ): Urea (H 2 NCONH 2 ) The ratio of the amount of substance is 3:1:9. The reaction k...

Embodiment 3

[0050] Example 3: Zn 2+ -Al 3+ -Fe 3+ Hydrotalcite-like Phosphorus Removal from Wastewater

[0051] The most common method that adopts the determination of phosphate in water---the phosphomolybdenum blue method, measures the Zn prepared by Example 1 2+ -Al 3 + -Fe 3+ Effect of hydrotalcite-like materials on phosphorus removal from wastewater. At room temperature, measure 20mL of 20mg / L phosphorus-containing sewage water samples in total of 6 parts, add 0.05g of Zn 2+ -Al 3+ -Fe 3+ Multi-component hydrotalcite materials were added to the water samples, and each water sample was stirred with a magnetic stirrer for 0, 5, 10, 15, 20, and 25 minutes, and the filter residue Zn was separated by suction filtration. 2+ -Al 3+ -Fe 3+ For multi-component hydrotalcite materials, add ammonium molybdate solution and tin dichloride glycerin solution to all filtrates, mix well, and quickly measure the absorbance with an ultraviolet spectrometer.

[0052] Depend on Figure 4 Visib...

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Abstract

The invention provides a method for preparing M 2+ ‑Al 3+ ‑Fe 3+ Methods and applications of hydrotalcite-like materials. The method is: add dilute hydrochloric acid to acidify the feedwater sludge containing amorphous iron and aluminum hydroxide, adjust the pH value, and stir to convert amorphous iron hydroxide and aluminum hydroxide into Fe 3+ and Al 3+ , then add a certain amount of divalent metal salt and urea, react at 120-180°C for 12-48 hours, wash the resulting precipitate, filter, and dry to obtain M 2+ ‑Al 3+ ‑Fe 3+ Multi-component hydrotalcite materials. The method is a new method for resource utilization of water supply sludge from a waterworks, and has the advantages of small equipment investment, low energy consumption, wide application of the obtained product, and high added value.

Description

technical field [0001] The invention belongs to the technical field of waste resource treatment, in particular, it relates to a method of preparing M 2+ -Al 3+ -Fe 3+ method for hydrotalcite-like materials. Background technique [0002] At present, there are roughly the following ways to dispose of water supply sludge at home and abroad: land disposal, sanitary landfill, land use, ocean disposal, and comprehensive utilization. However, water supply sludge has high energy consumption concentration and dehydration treatment The huge problems of process and output have brought challenges to the natural environment and social development. From the perspective of social development, resource utilization will be an important trend in water supply sludge disposal. The resource development and utilization of water supply sludge mainly focuses on the direct utilization of the adsorption performance of water supply sludge. For example: Lv Jinghua et al. have shown that aluminum s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/00C01G53/00B01J20/08B01J20/30C02F1/28C02F101/30C02F101/10
CPCC01G49/009C01G53/006B01J20/08C02F1/281C01P2002/72C01P2002/84B01J2220/4887C02F2101/308C02F2101/105
Inventor 韩银凤张瑞林
Owner BAOJI UNIV OF ARTS & SCI
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