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Calcium bicarbonate modified diatomite adsorbent

A technology of calcium bicarbonate and diatomite, which is applied in the direction of adsorption of water/sewage treatment, water/sludge/sewage treatment, and other chemical processes, and can solve problems such as structural changes, loss of crystal water, and fading effects. Achieve stable performance, strong adsorption performance, large porosity and specific surface area

Inactive Publication Date: 2015-06-03
QINGDAO HAOTAI WATER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when heated above 300 degrees Celsius, it begins to lose crystal water, which is a structural change that affects the fading effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Diatomaceous earth 124

[0015] Sodium bicarbonate 42

[0016] Saturated calcium chloride solution 33

[0017] Activated clay 20

[0018] Polyacrylamide 3

[0019] Preparation scheme: Add measured diatomite to the prepared sodium bicarbonate solution, slowly add saturated calcium chloride solution and activated clay while stirring, filter after the reaction, and place in an oven at 105°C After drying, calcium bicarbonate modified kelp can be obtained.

[0020] The diatomite material produced by the invention has stable performance, strong adsorption performance, large porosity and specific surface area, and the existence of a large number of micropores, so it is a good raw material for water treatment adsorbents.

Embodiment 2

[0022] Diatomaceous earth 136

[0023] Sodium bicarbonate 45

[0024] Saturated calcium chloride solution 36

[0025] Activated clay 24

[0026] Polyacrylamide 5

[0027] The preparation scheme is the same as above.

[0028] The pollutants in sewage have complex components. Diatomite can not only remove heavy metal ions, but also effectively recover heavy metal ions.

Embodiment 3

[0030] Diatomaceous earth 147

[0031] Sodium bicarbonate 49

[0032] Saturated calcium chloride solution 40

[0033] Activated clay 28

[0034] Polyacrylamide 7

[0035] The preparation scheme is the same as above.

[0036] Calcium bicarbonate modified diatomite is a self-adsorbent for purifying heavy metal ions such as chromium ions, zinc ions, copper ions and lead ions in wastewater, and its adsorption capacity is 3.5-4 mmol / g. The conditions for complete adsorption and removal of heavy metal ions are: copper ions, the pH value is 7-10; chromium ions, the pH value is greater than 5.5; zinc ions, the pH value is 8.5-9.5, lead ions, the pH value is 5-7 or pH Greater than 10.5. The adsorbent can be used not only under static conditions, but also under dynamic conditions, and it is packed in the tower in the form of particles. However, the mechanical strength of calcium carbonate-containing diatomite is only 3.43MPa. After adding bentonite as a binder, its mechanical stre...

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Abstract

The invention provides a calcium bicarbonate modified diatomite adsorbent. The calcium bicarbonate modified diatomite adsorbent consists of diatomite, sodium bicarbonate, a saturated calcium chloride solution, activated clay, and polyacrylamide. A preparation method of the calcium bicarbonate modified diatomite adsorbent comprises the following steps: adding metered diatomite to a prepared sodium bicarbonate solution, slowly adding the saturated calcium chloride solution, the activated clay and the like while stirring, filtering after the completion of reaction, arranging in an oven and drying under the condition of 105 DEG C to obtain the calcium bicarbonate modified diatomite.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a calcium bicarbonate modified diatomite adsorbent for treating wastewater containing heavy metal ions. Background technique [0002] Adsorbent is a product required in the fields of beverage manufacturing, wastewater treatment, oil production, and chemical analysis. Its main function is to absorb toxic and harmful substances in liquids to purify products. In the field of chemical analysis, the role of the adsorbent is to fix certain measured elements in the liquid on the adsorbent, and then place it in the analytical instrument for qualitative analysis and quantitative detection. Among them, the performance of the adsorbent as the carrier of the element to be measured is very important, and the most important performance includes the adsorption capacity of the adsorbent, the cleanliness of the adsorbent itself, and the apparent quality. [0003] Lead is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/14B01J20/30C02F1/28C02F1/62
Inventor 张欣周相勇
Owner QINGDAO HAOTAI WATER
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