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Method for preparing heavy metal adsorbent by utilizing caustic dross

An adsorbent and heavy metal technology, which is applied in the field of heavy metal adsorbent preparation by using alkali slag, can solve the problems of difficult large-scale industrial application, secondary pollution needs to be studied, and high preparation cost, so as to improve adsorption capacity, reduce application cost, and widely Effect of the pH range of application

Active Publication Date: 2014-08-13
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] (2) Although the adsorbent prepared by purified industrial materials has high removal efficiency, the amount prepared each time is relatively small, and the preparation cost is high, so it is difficult to realize large-scale industrial application
For example, many phosphogypsums contain environmental pollutants such as arsenic, copper, zinc, iron, manganese, lead, cadmium, mercury, radioactive elements, and fluoride. It remains to be seen whether subsequent large-scale use will cause secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1) Pretreatment of alkali slag: After the alkali slag is crushed, it is washed with water, dried at 100°C, and ground until it passes through a 100-mesh sieve for later use;

[0040] 2) Synthesis of powdered adsorbent: 5.0 g of pretreated alkali slag was added to 200 mL of 1 mol / L commercial phosphoric acid solution, 15.0 g of sodium ethylenediaminetetraacetic acid (EDTA) was added, and fully stirred at 40°C. After the stirring is completed, filter the filtrate, adjust its pH to 9.0 with lye, and then transfer it to a reaction kettle with a polytetrafluoroethylene inner inch. Control the reaction temperature at 150°C and the reaction time for 14 hours. After the reaction, centrifuge to obtain a solid, and wash it with water. After drying, the powdered adsorbent is obtained;

[0041] 3) Preparation of heavy metal adsorbent: mix the powdered adsorbent prepared in 2) with clay and activated sludge according to 65%: 25%: 10%, then granulate, and then calcined at 550°C for 2...

Embodiment 2

[0044] 1) Pretreatment of alkali slag: After the alkali slag is crushed, it is washed with water, dried at 100°C, and ground until it passes through a 100-mesh sieve for later use;

[0045] 2) Synthesis of powdered adsorbent: Take 5.0g of pretreated alkali slag and add it to 200mL of diluted waste etching solution (containing phosphoric acid concentration 1mol / L), add 15.0g of sodium ethylenediaminetetraacetate (EDTA) , fully stirred at 40°C. After the stirring is completed, filter the filtrate, adjust its pH to 9.0 with lye, and then transfer it to a reaction kettle with a polytetrafluoroethylene inner inch. Control the reaction temperature at 150°C and the reaction time for 14 hours. After the reaction, centrifuge to obtain a solid, and wash it with water. After drying, the powdered adsorbent is obtained;

[0046]3) Preparation of heavy metal adsorbent: mix the powdered adsorbent prepared in 2) with clay and activated sludge according to 65%: 25%: 10%, then granulate, and t...

Embodiment 3

[0049] 1) Pretreatment of alkali slag: After the alkali slag is crushed, it is washed with water, dried at 80°C, and ground until it passes through a 200-mesh sieve for later use;

[0050] 2) Synthesis of powdered adsorbent: Take 1.0g of pretreated alkali slag and add it to 100mL of diluted crude phosphoric acid (phosphate root concentration is 0.47mol / L), add 1.7g of ethylene glycol bis(2-amino Ethyl ether) tetraacetic acid (EGTA), fully stirred at 60°C. After the stirring is completed, filter and take the filtrate, adjust its pH to 8.0 with lye, and then transfer it to the reaction kettle in the inner village of polytetrafluoroethylene. After that, the powdered adsorbent is obtained;

[0051] 3) Preparation of heavy metal adsorbent: mix the powdered adsorbent prepared in 2) with cement, clay mixture (1:1), and activated sludge according to 70%: 27%: 3%, then granulate, and then granulate at 600 The heavy metal adsorbent was obtained by calcining at ℃ for 4 hours.

[0052]...

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Abstract

The invention discloses a method for preparing a heavy metal adsorbent by utilizing caustic dross. The method comprises the following steps: (1) pretreating caustic dross; (2) synthesizing a powdery adsorbent; (3) preparing a forming adsorbent; (4) applying high-concentration heavy metal waste water. According to the invention, solid waste caustic dross of ammonia alkali factories is adopted as raw material to prepare a heavy metal adsorbent which is high in adsorption efficiency and is environment-friendly; not only is a high-additional-value resource road found for the caustic dross, and the solid waste treatment pressure of the ammonia alkali factories is relieved, but also the environment-friendly concepts of 'turning wastes into wealth' and 'treatment of wastes with processes of wastes against one another' are realized.

Description

technical field [0001] The invention relates to a method for preparing a heavy metal adsorbent, in particular to a method for preparing a heavy metal adsorbent by using alkali slag. Background technique [0002] Soda ash is an important basic chemical raw material, which is widely used in metallurgy, chemical industry, textile, papermaking, medicine and food industries. The soda making industry occupies an important position in the national economy. However, in the process of making soda by ammonia-soda method, 300-350 kilograms of waste residue will be produced for every ton of soda ash produced. Several large soda factories in my country use the ammonia-soda method to produce more than 3 million tons of soda ash every year, and discharge more than 600,000 tons of waste residue. Waste slag has not been properly treated and utilized for a long time, not only causing waste of resources, but also occupying a large area of ​​land, polluting the environment, and destroying ecolog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/04B01J20/30C02F1/28C02F1/62
Inventor 孙秀云王连军严玉波周松照董晓丽王燕鹏沈锦优李健生
Owner NANJING UNIV OF SCI & TECH
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