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Technology for preparing low-cost adsorbent by using coaly fly ash

An adsorbent, low-cost technology, applied in the direction of adsorption water/sewage treatment, inorganic chemistry, water/sludge/sewage treatment, etc., can solve problems such as heavy metal pollution, soil, water source and crop hazards, fly ash cannot be used, etc. Achieve high efficiency, low cost, and reduce the effect of preparation cost

Inactive Publication Date: 2018-06-19
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, for a long time, the utilization of coal has been dominated by combustion for power generation, and a large amount of fly ash produced cannot be utilized
At the same time, with the continuous development of industry, a large amount of wastewater cannot be fully treated, and the pollution of heavy metals represented by mercury is particularly serious.
In addition, a large amount of heavy metals discharged from industrial production will cause irreversible harm to soil, water sources and crops.

Method used

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  • Technology for preparing low-cost adsorbent by using coaly fly ash

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A process for preparing a low-cost adsorbent from coal-based fly ash, comprising the following steps:

[0027] In step 1, coal-based fly ash is added into a reactor, and zeolization treatment is carried out under microwave irradiation conditions to obtain treated fly ash.

[0028] Step 2: Weigh the treated fly ash and sodium hydroxide according to the mass ratio of 1:5, and add 1L of water for mixing to obtain a suspension with a mass concentration of 10g / L.

[0029] Step 3, adding the suspension into the reaction tank for stirring to obtain a slurry. In this embodiment, the stirring temperature is 30°C-90°C, and the stirring time is 6h-18h.

[0030] In step 4, after the slurry is left to stand at room temperature for 1 h to 10 h, the supernatant is discarded, and the lower layer is irradiated with microwaves to obtain an adsorbent. In this embodiment, the microwave irradiation time is 10 minutes to 60 minutes.

[0031] Step 5, performing dilution or concentration pr...

Embodiment 2

[0037] In the present embodiment 2, regarding the same steps and conditions as in the embodiment 1, the same explanations are omitted.

[0038] In step 2 of this embodiment, take the fly ash and sodium hydroxide after treatment according to the mass ratio of 1:5, and add 1 / 3L water to mix to obtain a suspension with a mass concentration of 30g / L. The remaining implementation steps and conditions are the same as Example 1 is the same.

[0039] The experimental results show that the removal rate of heavy metals obtained after the industrial wastewater is mixed and adsorbed by the adsorbent prepared by the suspension with a mass concentration of 30g / L is shown in Table 1.

Embodiment 3

[0041] In the present embodiment 3, regarding the same steps and conditions as in the embodiment 1, the same explanations are omitted.

[0042] In step 2 in this embodiment, take the processed fly ash and sodium hydroxide according to the mass ratio of 1:5, and add 1 / 5L water to mix to obtain a suspension with a mass concentration of 50g / L. The rest of the implementation steps and conditions are the same as Example 1 is the same.

[0043] The experimental results show that the removal rate of heavy metals obtained after the industrial wastewater is mixed and adsorbed by the adsorbent prepared by the suspension with a mass concentration of 50g / L is shown in Table 1.

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Abstract

The invention provides a technology for preparing a low-cost adsorbent by using coaly fly ash. The technology comprises the following steps: 1) performing zeolitization on coaly fly ash to obtain theprocessed fly ash; 2) weighing the processed fly ash, sodium hydroxide and water and mixing the materials to obtain a fluid suspension with a certain mass concentration; 3) adding the fluid suspensionin a reaction tank and stirring the material to obtain slurry; 4) after the slurry is subjected to standing for 1-10 h at room temperature, performing microwave radiation on a precipitate at a lowerlayer to obtain the adsorbent; 5) per-treating industrial wastewater to obtain the pre-treated waste water with predetermined concentration; 6) adding the adsorbent in the pre-treated waste water, employing a vibrator with a speed being 50-500 r / min for mixing the materials with a stay time of 5 min-24 h to obtain mixed liquor; and 7) employing a centrifugation separator for separating the mixed liquor for 10-60 min, and removing the precipitate at the lower layer to obtain the processed solution.

Description

technical field [0001] The invention relates to a preparation process of an adsorbent, in particular to a process for preparing a low-cost adsorbent by using coal-based fly ash. Background technique [0002] Coal has always been the most important fossil energy supporting my country's development, and its status will not change for a long time in the future. [0003] However, for a long time, the utilization of coal has been dominated by combustion for power generation, and a large amount of fly ash produced cannot be utilized. At the same time, with the continuous development of industry, a large amount of wastewater cannot be fully treated, and the pollution of heavy metals represented by mercury is particularly serious. In addition, a large amount of heavy metals discharged from industrial production will cause irreversible harm to soil, water sources and crops. [0004] The study found that the use of coal fly ash as a matrix has a good purification effect on heavy met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/30C02F1/28C02F101/20
CPCB01J20/10B01J2220/4887C02F1/281C02F2101/20
Inventor 张守玉李昊慕晨吴渊默张一帆江锋浩王才威
Owner UNIV OF SHANGHAI FOR SCI & TECH
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