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Method for recovering and utilizing sewage generated during technology process of acid method for extracting aluminum oxide from fly ash

A technology of sewage recycling and alumina, applied in chemical instruments and methods, aluminum sulfate, water/sewage treatment, etc., can solve the problem of undisclosed alumina extraction technology, such as sewage recycling and utilization methods.

Inactive Publication Date: 2014-07-23
XINJIANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The literature search shows that there is no publicized method of using scrap steel slag to treat the waste water of fly ash acid extraction of alumina technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] (1) Raw material preparation: the concentration of aluminum ions in the waste water of the fly ash acid method for extracting alumina technology is 0.13mol / L, and the concentration of sulfuric acid is 6.7%;

[0020] (2) Get above-mentioned sewage 100mL, scrap steel slag 5g, scrap steel slag is added in the sewage, stir evenly, join in the reactor;

[0021] (3) Reaction at a reaction temperature of 60° C. for 1 h;

[0022] (4) Filter the reacted solution, combine impurity removal and crystallization to obtain aluminum sulfate and ferric sulfate solutions; the separation and conversion of aluminum sulfate and ferric sulfate into corresponding oxides are known technologies, and will not be repeated here.

[0023] Under this condition, the concentration of sulfuric acid in the sewage drops below 0.5%, the recovery rate of aluminum reaches 85.0%, and the recovery rate of iron reaches 82.9%.

example 2

[0025] (1) Raw material preparation: the concentration of aluminum ions in the waste water of the fly ash acid method for extracting alumina technology is 0.21mol / L, and the concentration of sulfuric acid is 11.4%;

[0026] (2) Get above-mentioned sewage 100mL, scrap steel slag 10g, scrap steel slag is added in the sewage, stir evenly, join in the reactor;

[0027] (3) reacting at a reaction temperature of 70° C. for 1.5 h;

[0028] (4) Filter the reacted solution, combine impurity removal and crystallization to obtain aluminum sulfate and ferric sulfate solutions; the separation and conversion of aluminum sulfate and ferric sulfate into corresponding oxides are known technologies, and will not be repeated here.

[0029] Under this condition, the sulfuric acid concentration in the sewage drops below 0.5%, the recovery rate of aluminum reaches 86.3%, and the recovery rate of iron reaches 84.1%.

example 3

[0031] (1) Raw material preparation: the concentration of aluminum ions in the waste water of the fly ash acid method for extracting alumina technology is 0.27mol / L, and the concentration of sulfuric acid is 16.3%;

[0032] (2) Get above-mentioned sewage 100mL, scrap steel slag 15g, scrap steel slag is added in the sewage, stir evenly, join in the reactor;

[0033] (3) reacting at a reaction temperature of 90° C. for 2.5 hours;

[0034] (4) Filter the reacted solution, combine impurity removal and crystallization to obtain aluminum sulfate and ferric sulfate solutions; the separation and conversion of aluminum sulfate and ferric sulfate into corresponding oxides are known technologies, and will not be repeated here.

[0035] Under this condition, the concentration of sulfuric acid in the sewage drops below 0.5%, the recovery rate of aluminum reaches 90.4%, and the recovery rate of iron reaches 87.3%.

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Abstract

The invention discloses a method for recovering and utilizing sewage generated during the technology process of an acid method for extracting aluminum oxide from fly ash, and belongs to the technical field of joint recovery and utilization of aluminum-containing waste acid and solid wastes. The method utilizes the waste steel slag discharged during the steel making process to process the sewage generated during the technology process of an acid method for extracting aluminum oxide from fly ash, recycles aluminum oxide and iron oxide in the sewage, and consumes the acid solution in the sewage. The method comprises the following steps: adding waste steel slag into the sewage according to a certain solid / liquid ratio, wherein the sewage is measured in volume (mL), and the waste steel slag is measured in weight (g); controlling the operation temperature in a range of 50 to 100 DEG C, and the reaction time in a range of 1 to 3 hours; recovering the hydrogen gas generated during the reaction process, burning the hydrogen gas to provide a heat source for the reactions; and then subjecting the reaction product to processes of solid / liquid separation, joint impurity removing, crystallization, and burning so as to obtain solid aluminum oxide and solid iron oxide; wherein the filter slag generated in the solid / liquid separation process can be mixed with the waste steel slag according to a ratio of waste steel slag to filter slag of (1-10): 1, and thus circulation utilization is achieved. The method utilizes the waste steel slag generated during the steel making process to process sewage generated during the technology process of an acid method for extracting aluminum oxide from fly ash, processes wastes by using wastes, and achieves the joint treatment and resource recovery of liquid wastes and solid wastes.

Description

(1) Technical field [0001] The invention belongs to a recovery and utilization method of sewage in the technology of extracting alumina by fly ash acid method, and particularly relates to the technical field of combined recovery and utilization of sewage and solid waste. (2) Background technology [0002] my country is the country with the largest thermal power generation in the world, and also the country with the largest discharge of fly ash. In recent years, my country's electric power industry has developed rapidly, and the total amount of thermal power generation has also increased rapidly. Therefore, the discharge of fly ash is also increasing year by year. [0003] Due to the high content of Al in fly ash 2 o 3 , the content can generally reach 20% to 40%, and the highest can reach more than 50%. It can replace bauxite and become a good alumina resource. Therefore, the technology of extracting alumina from fly ash is receiving more and more attention. Follow and res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/74C01G49/14C02F1/58C02F1/64
Inventor 秦高飞宿新泰杨超王吉德马凤云李志娟钟梅武荣兰
Owner XINJIANG UNIVERSITY