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Method of using aluminum-titanium composite tanning wastes to remove trivalent chromium in chrome tanning wastewater

A technology of trivalent chromium and waste, which is applied to the removal of solid waste, chemical instruments and methods, and water pollutants. It can solve the problems of high cost and failure to meet national discharge standards, and achieve low cost, significant treatment effect, The effect of good economic and environmental benefits

Active Publication Date: 2012-10-24
安徽鑫山新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of chrome tanning wastewater treatment, alkali precipitation method is currently the most commonly used mature treatment method in China. It has a good effect on high-concentration chromium-containing wastewater, and the removal rate of total chromium can reach more than 98%. However, due to the tanning industry Due to its own industry characteristics, the addition of organic masking agents and the production of hydrolyzed collagen substances in the tanning process can cause chromium to interact with these organic substances, resulting in the total chromium concentration in the effluent after precipitation is usually between 2.0mg / L~10mg / L time, unable to meet the national emission standard of 1.5mg / L
For low-concentration chromium-containing wastewater, commonly used treatment technologies mainly include adsorption method, ion exchange method, etc., but because of their high cost, they are not suitable for most enterprises in my country.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The method for removing trivalent chromium in chrome tanning wastewater by using aluminum-titanium composite tanning waste comprises the following steps:

[0024] 1) Preparation of adsorbent

[0025] Take 500mL aluminum-titanium tanning wastewater, the molar ratio of aluminum-titanium is 7000:1, pH=3.88), under room temperature, add 2.0mol / L NaOH solution dropwise thereto while stirring (dropping rate 5.0mL / min), to Solution pH=7.06, continue to stir for 11h, then stand and age at room temperature for 17h to form a precipitate. Vacuum filter the precipitate, fully wash with distilled water until the eluent is neutral, collect the precipitate, vacuum-dry at 40°C (vacuum degree is -0.1MPa), and then grind it through a 40-mesh sieve. Calcined in a furnace at 500°C for 3 hours to obtain an aluminum-titanium composite oxide adsorbent (the molar ratio of aluminum:titanium is 5:1).

[0026] 2) Adsorption to remove Cr(III)

[0027] The sintered aluminum tanning wastewater pr...

Embodiment 2

[0030] 1) Preparation of adsorbent

[0031] Take 500mL of aluminum-titanium tanning wastewater (pH=3.88), at room temperature, add 2.0mol / L NaOH solution (dropping rate 5.0mL / min) to it dropwise while stirring, until the solution pH=7.2, continue to stir for 10h, Then it was aged at room temperature for 17 hours to form a precipitate. Vacuum filter the precipitate, wash fully with distilled water until the eluent is neutral, collect the precipitate, vacuum-dry at 40°C (vacuum degree is -0.5MPa), and then grind it through a 40-mesh sieve. Calcined in a furnace at 400°C for 5 hours to obtain an aluminum-titanium composite oxide adsorbent (the molar ratio of aluminum:titanium is 8:1).

[0032] 2) Adsorption to remove Cr(III)

[0033] Same as in Example 1, using the sintered aluminum tanning wastewater precipitate as an adsorbent to treat chromium-containing wastewater with an initial Cr(III) concentration of 10 mg / L, the adsorption condition is 15°C constant temperature water b...

Embodiment 3

[0035] 1) Preparation of adsorbent

[0036] Take 500mL of aluminum-titanium tanning wastewater (pH=3.88), at room temperature, add 2.0mol / L NaOH solution (dropping rate 5.0mL / min) to it dropwise while stirring, until the solution pH=7.0, continue to stir for 10h, Then it was aged at room temperature for 24 hours to form a precipitate. Vacuum filter the precipitate, wash fully with distilled water until the eluent is neutral, collect the precipitate, dry it in vacuum at 60°C (vacuum degree is -0.3MPa), and then grind it through a 50-mesh sieve, in a muffle Calcined in a furnace at 600°C for 2 hours to obtain an aluminum-titanium composite oxide adsorbent (the molar ratio of aluminum:titanium is 10:1).

[0037] 2) Adsorption to remove Cr(III)

[0038] Same as Example 1, using the sintered aluminum tanning wastewater sediment as the adsorbent, the adsorption condition is 35°C constant temperature water bath oscillation, other conditions are unchanged, the adsorption amount of C...

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Abstract

The invention discloses a method of using aluminum-titanium composite tanning wastes to remove trivalent chromium in chrome tanning wastewater. The method includes: sintering precipitates generated during aluminum tanning wastewater treatment to obtain an Al-Ti composite oxide adsorbent, using the Al-Ti composite oxide adsorbent to treat unqualified chromium-containing wastewater after alkalifying treatment, adsorbing Cr (III) in water for 0.5-8h with the temperature of 15-35 DEG C and the pH ranging from 6.0 to 12.0, collecting precipitates, and purifying Cr (III) in water. The sintered precipitates of aluminum tanning wastewater is used as the adsorbent to recycle the precipitates generated during tanning wastewater treatment, and the method has the advantages of implementation of treating wastes with wastes, ecology and environment friendliness. Further, the method is simple in operation and low in cost.

Description

technical field [0001] The invention belongs to the technical field of water body purification and treatment, and relates to the purification of trivalent chromium in tanning wastewater, in particular to a method for removing trivalent chromium in chrome tanning wastewater by using aluminum-titanium composite tanning waste. Background technique [0002] As one of the "five poisons", chromium will cause serious harm to organisms, soil, and water bodies. In tanning industrial wastewater, the main source of chromium is the tanning process, in which the utilization rate of chromium is generally 70%-90%, and the remaining 10%-30% of chromium remains in the wastewater. Chromium salts in tannery wastewater mainly exist in the form of trivalent chromium Cr(III). In the process of chrome tanning wastewater treatment, alkali precipitation method is currently the most commonly used mature treatment method in China. It has a good effect on high-concentration chromium-containing wastewa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/62B01J20/08B01J20/30B09B3/00C02F101/22
Inventor 马宏瑞连坤宙马秀
Owner 安徽鑫山新材料科技有限公司