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Method for preparing chromium adsorbent from yellow phosphorus slag and application

A technology of yellow phosphorus slag and adsorbent, which is applied in the field of preparation of chromium adsorbent in chromium-containing wastewater, and achieves the effects of simple process equipment, easy operation and resource saving

Inactive Publication Date: 2019-04-26
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Yellow phosphorus slag is an amorphous and highly active solid waste that is formed at a high temperature of 1400-1600°C when the electric furnace method uses phosphate rock, silica, coke and other raw materials to produce yellow phosphorus. , containing a large amount of SiO 2 and CaO; there is no report identical with the present invention

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Add 600 grams of nitric acid solution with a mass concentration of 10% into the reactor, add 50 grams of yellow phosphorus slag at a liquid-solid mass ratio of 12:1, stir and leaching reaction at room temperature at a stirring speed of 400 rpm for 1.0 h, separating and obtaining leachate and hydrated silicic acid solid material;

[0027] (2) The hydrated silicic acid solid phase material obtained in step (1) is washed 3 times with water containing 50% of the raw material mass of yellow phosphorus slag from step (1), and then dried at 150°C for 3 hours;

[0028] (3) Add the hydrated silicic acid solid phase material dried in step (2) into the 3-aminopropyltriethoxysilane-absolute ethanol solution with a mass concentration of 5% at room temperature and 300rpm stirring conditions, Stir the reaction for 3.0 hours, then place the mixture under ultrasonic conditions to disperse for 1.0 hours, let it stand and age for 5.0 hours, filter and separate to obtain a composite so...

Embodiment 2

[0034] (1) Add 400 grams of nitric acid solution with a mass concentration of 15% into the reactor, add 50 grams of yellow phosphorus slag at a liquid-solid mass ratio of 8:1, stir and leaching reaction at room temperature and a stirring speed of 500 rpm for 0.5 h, separating and obtaining leachate and hydrated silicic acid solid material;

[0035] (2) The hydrated silicic acid solid phase material obtained in step (1) is washed 3 times with water of 80% of the raw material mass of yellow phosphorus slag in step (1), and then dried at 120°C for 5 hours;

[0036] (3) Add the hydrated silicic acid solid phase material dried in step (2) into the polyaminoalkyltrialkoxysilane-isopropanol solution with a mass concentration of 7% at room temperature and 400rpm stirring, and stir React for 5.0 hours, then place the mixture under ultrasonic conditions for dispersing for 1.5 hours, let it stand and age for 3.0 hours, and filter and separate to obtain a composite solid material and filt...

Embodiment 3

[0042] (1) Add 500 grams of nitric acid solution with a mass concentration of 12% into the reactor, add 50 grams of yellow phosphorus slag at a liquid-solid mass ratio of 10:1, and stir at room temperature and a stirring speed of 300 rpm for leaching reaction 2.0 h, separating and obtaining leachate and hydrated silicic acid solid material;

[0043] (2) The hydrated silicic acid solid phase material obtained in step (1) is washed 3 times with water containing 60% of the raw material mass of yellow phosphorus slag from step (1), and then dried at 130°C for 4 hours;

[0044] (3) Add the dried silicic acid hydrate solid phase material in step (2) into the γ-aminopropyltrimethoxysilane-methanol solution with a mass concentration of 10% at room temperature and stirring at 500rpm, and stir for 4.0 hours, and then the mixture was placed under ultrasonic conditions for dispersing for 1.5h, standing and aging for 4.0h, and filtered to separate the composite solid material and filtrate,...

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Abstract

The invention discloses a method for preparing a chromium adsorbent from yellow phosphorus slag and an application. The method comprises the following steps: the yellow phosphorus slag is leached anddecomposed with a nitric acid solution, a decomposed solid material is washed and dried, a porous SiO2 powdery support material with high activity is obtained and subjected to coated compositing withan impregnation method, and an SiO2-based chromium adsorbent powder material is obtained; a decomposed leachate is converted by ammonium carbonate, and light calcium carbonate and an ammonium nitratesolution are obtained; the SiO2-based chromium adsorbent powder material has good adsorptive property for chromium in wastewater when applied to chromium-containing wastewater treatment; the method adopts simple process and equipment and is easy and safe to operate, the utilization rate of the yellow phosphorus slag resource is high, one technical route for producing products with higher added values from industrial waste is provided, secondary comprehensive utilization of resources can be realized, and the purposes of circular economy, energy conservation and emission reduction are achieved.

Description

technical field [0001] The invention belongs to the field of industrial solid waste utilization, and in particular relates to the preparation and application of a chromium adsorbent in chromium-containing wastewater. Background technique [0002] With the rapid development of industry, agriculture and urbanization, the problem of water pollution caused by heavy metal ions has gradually intensified. Among the heavy metal pollutants, chromium (Cr) is one of the common and most toxic heavy metal pollutants. The chromium in chromium-containing wastewater mainly comes from industries such as electroplating, tanning, chemical industry, pigments, metallurgy, and refractory materials. It exists in the form of trivalent and hexavalent compounds. Due to the high solubility of hexavalent chromium and its high carcinogenicity and mutagenicity, its toxicity is the strongest, about a hundred times that of trivalent chromium, and it is more biologically toxic than trivalent chromium. All...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/30C02F1/28C02F101/22
CPCB01J20/103B01J20/22C02F1/288C02F2101/22B01J2220/4887
Inventor 苏毅韩乐裴婉莹王华丹贡纬华李国斌胡亮
Owner KUNMING UNIV OF SCI & TECH
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