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Method for preparing iron oxide red from coal ash

A technology of iron oxide red and fly ash is applied in the field of environmental chemistry to achieve the effects of improving utilization rate, good separation effect and high preparation efficiency

Active Publication Date: 2016-08-03
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these utilization methods have not effectively utilized the valuable metal ions in fly ash

Method used

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  • Method for preparing iron oxide red from coal ash
  • Method for preparing iron oxide red from coal ash
  • Method for preparing iron oxide red from coal ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] A kind of preparation method of iron oxide red, process flow chart sees figure 1 , and its specific preparation steps are as follows:

[0056] (1) Soak 1 mass part of fly ash in 1 mass part of 4mol / L hydrochloric acid solution for 5 hours, then remove the filter residue to obtain acid dipping solution.

[0057] (2) The extraction organic phase of 1 volume part of N503+TBP+kerosene composition is placed in the extraction reactor and mixed with 1 volume part of the pickling solution, wherein the volume ratio of N503:TBP:kerosene is 2:1:2, extraction The volume ratio of the organic phase to the pickling solution is 1:2, then vibrate for 5 minutes, separate the phases and keep the extract.

[0058] (3) the oxalic acid solution of 1 volume part 0.75mol / L is placed in the extraction reactor as back extraction agent and 1 volume part extraction liquid in step (2) and mixes, and wherein the volume ratio of back extraction agent and extraction liquid is 1 : 1, then shake and c...

Embodiment 2

[0061] (1) Soak 1 mass part of fly ash in 1 mass part of 4mol / L hydrochloric acid solution for 5 hours, then remove the filter residue to obtain acid dipping solution.

[0062] (2) The extraction organic phase of 1 volume part of N503+TBP+kerosene composition is placed in the extraction reactor and mixed with 1 volume part of the pickling solution, wherein the volume ratio of N503:TBP:kerosene is 2:1:2, extraction The volume ratio of the organic phase to the pickling solution is 1:1, then vibrate and contact for 5 minutes, then separate the phases at rest, and retain the extract.

[0063] (3) the oxalic acid solution of 1 volume part 0.75mol / L is placed in the extraction reactor as back extraction agent and 1 volume part extraction liquid in step (2) and mixes, and wherein the volume ratio of back extraction agent and extraction liquid is 1 : 1, then shake and contact for 4min, static phase separation, the unloaded organic phase after phase separation is recycled, and the stri...

Embodiment 3

[0066] (1) Soak 1 mass part of fly ash in 1 mass part of 4mol / L hydrochloric acid solution for 5 hours, then remove the filter residue to obtain acid dipping solution.

[0067] (2) The extraction organic phase of 1 volume part of N503+TBP+kerosene composition is placed in the extraction reactor and mixed with 1 volume part of the pickling solution, wherein the volume ratio of N503:TBP:kerosene is 2:1:2, extraction The volume ratio of the organic phase to the pickling solution is 3:1, then vibrate and contact for 5 minutes, then separate the phases at rest, and retain the extract.

[0068] (3) the oxalic acid solution of 1 volume part 0.75mol / L is placed in the extraction reactor as back extraction agent and 1 volume part extraction liquid in step (2) and mixes, and wherein the volume ratio of back extraction agent and extraction liquid is 1 : 1, then shake and contact for 4min, static phase separation, the unloaded organic phase after phase separation is recycled, and the stri...

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Abstract

The invention belongs to the field of environmental chemistry and discloses a method for preparing iron oxide red from coal ash .The method comprises the steps of 1, acid leaching, wherein digestion is conducted on coal ash with acid solution to obtain acid leaching solution; 2, extraction, wherein the acid leaching solution is extracted with an extracted organic phase to obtain extract liquor; 3, back extraction, wherein back extraction is conducted on the extract liquor with a back extractant to obtain back extraction solution; 4, evaporation and concentration, wherein the back extraction solution is evaporated, concentrated and crystallized; 5, calcination, wherein crystals are calcined to obtain iron oxide red .According to the method, iron oxide red is prepared with coal ash as the raw material, recycling application of coal ash waste is achieved, the utilization rate of valuable metal in coal ash is increased, and the environment problem is solved; an adopted extraction agent can be recycled, so that industrial production cost is reduced; the quality of prepared iron oxide red is high, and purity is 95% or more and meets the GB1863-2008 product technology requirement.

Description

technical field [0001] The invention belongs to the field of environmental chemistry, in particular to a method for preparing iron oxide red from fly ash. Background technique [0002] Fly ash is the powdery ash collected from the flue gas of coal-fired boilers. It is called "flyash" or "finely ground fuel ash" in foreign literature. It is the main industrial solid waste produced by coal-fired power plants. The main chemical composition of fly ash is SiO 2 、Al 2 o 3 , Fe 2 o 3 etc. and unburned carbon, and some trace elements and rare elements. For quite a long time, coal will still be the main energy source in our country. At present, in my country's primary energy structure, coal accounts for more than 50%, of which 70% is used for coal-fired power generation. According to relevant statistics, the output of fly ash in my country reached 375 million tons in 2009, and 700 million tons in 2010. It is estimated that by 2020, the total accumulated stock of fly ash in my ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06
CPCC01G49/0009C01G49/06C01P2002/72C01P2004/03C01P2006/80
Inventor 李明玉许文杰
Owner JINAN UNIVERSITY
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