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Efficient slag-based inorganic phosphorous removal flocculating agent and preparation method thereof

A coagulant and slag technology, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water/sewage treatment, etc., can solve the problems of environmental pollution, waste of resources, low aluminum leaching rate, etc. Efficient utilization of resources, enhanced adsorption performance, and high phosphorus removal efficiency

Inactive Publication Date: 2016-06-22
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Previous studies have been done on the preparation of phosphorus removal coagulants by acid modification and adding fluorine-containing compounds as cosolvents. However, due to the low leaching rate of aluminum by acid modification, resources are wasted, and the production process produces Fluoride is put into the atmosphere, which has certain pollution to the environment

Method used

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  • Efficient slag-based inorganic phosphorous removal flocculating agent and preparation method thereof
  • Efficient slag-based inorganic phosphorous removal flocculating agent and preparation method thereof
  • Efficient slag-based inorganic phosphorous removal flocculating agent and preparation method thereof

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Embodiment 1

[0046] The invention provides a high-efficiency slag-based inorganic phosphorus removal coagulant and a preparation method thereof, comprising the following steps:

[0047] 1) Raw material pretreatment: pulverize fly ash and bauxite respectively, grind them, pass through a 100-mesh sieve, and then place them in an oven to dry at 103°C-105°C;

[0048]2) Alkaline leaching extraction: weigh 8g each of the dried fly ash and bauxite, put them in a three-necked flask, and use 160mL NaOH solution with a concentration of 4mol / L for alkali leaching extraction: at 100°C, with Stir for 2 hours on a DC digital display temperature-controlled agitator at a speed of 250r / min, leave to age for 24 hours, and filter with a filter cloth to obtain alkali supernatant A and filter residue A;

[0049] 3) Acid leaching extraction: Rinse the filter residue A three times with distilled water, add 160 mL of hydrochloric acid with a concentration of 2 mol / L to acidify, and stir at 100 ° C for 2 h on a DC...

Embodiment 2

[0053] The present invention provides a high-efficiency slag-based inorganic phosphorus-removing coagulant and a preparation method thereof. The steps are the same as in Example 1, except that in step 4): the volume ratio of alkali supernatant A and acid supernatant B is 1 :16.

Embodiment 3

[0055] The present invention provides a high-efficiency slag-based inorganic phosphorus-removing coagulant and a preparation method thereof. The steps are the same as in Example 1, except that in step 4): the volume ratio of alkali supernatant A and acid supernatant B is 1 :20.

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Abstract

The invention provides an efficient slag-based inorganic phosphorous removal flocculating agent and a preparation method thereof. According to the flocculating agent, coal ash serves as the main raw material, meanwhile monohydrallite is added to supplement the iron element, and the efficient slag-based inorganic phosphorous removal flocculating agent is prepared through a two-section type modification method. The preparation method includes the following steps of raw material preprocessing, alkali leaching and extracting, acid leaching and extracting, mixing and drying. By means of the efficient slag-based inorganic phosphorous removal flocculating agent, defects of aluminum-based coagulation can be overcome in combination with the advantages of ferric flocculant that the alum floc is dense, and the sedimentation rate is high, the phosphorous removal effect can be greatly improved, and the efficient slag-based inorganic phosphorous removal flocculating agent has the advantages of being simple in production process, low in cost, remarkable in coagulation effect and the like.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a high-efficiency slag-based inorganic phosphorus-removing coagulant and a preparation method thereof. Background technique [0002] Coagulants can reduce the sensory indicators such as turbidity and chromaticity of sewage, remove a variety of high molecular weight organic matter and some heavy metal ions, and play an important role in sewage treatment. Therefore, the development of coagulants for water treatment has a very necessary practical application value. [0003] Coarse suspended solids with large particles in sewage treatment can be removed by natural precipitation, but smaller suspended solids, especially colloidal particles, settle very slowly, and can even maintain a dispersed and suspended state in sewage for a long time, so it is difficult to use natural precipitation method to separate and remove from water. The principle of the coagulant is to d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52
CPCC02F1/5236C02F1/5263
Inventor 李柏林姚亚张程琛梁亚楠樊航旭李晔
Owner WUHAN UNIV OF TECH
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