Method for preparing alum by utilization of activated clay waste acid mother solution

A technology of activated clay and acid mother, applied in aluminum sulfate, aluminum sulfur compounds and other directions, can solve the problems of high cost and long cycle of alum, and achieve the effects of low production cost, short production cycle and high purity

Inactive Publication Date: 2016-01-27
GUANGXI LONGAN RUIFENG IND TRADING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The technical problem to be solved in the present invention is to provide a method for preparing alum by using activated clay waste acid mother liquor, so as to solve the problems of activated clay production wastewater treatment and effective substance recycling in the prior art, as well as the high cost and long cycle of producing alum

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  • Method for preparing alum by utilization of activated clay waste acid mother solution
  • Method for preparing alum by utilization of activated clay waste acid mother solution
  • Method for preparing alum by utilization of activated clay waste acid mother solution

Examples

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Effect test

Embodiment 1

[0033] A kind of method utilizing activated clay waste acid mother liquor to prepare ammonium alum, comprises the following steps:

[0034] S1: Use activated clay waste acid mother liquor to mix with bentonite, control the temperature of the solution at 95°C to dissolve the aluminum sulfate in bentonite in the waste acid mother liquor, and then circulate the activated clay waste acid mother liquor with increased concentration of aluminum sulfate with the newly added bentonite Mix and circulate 3 times in this way until the aluminum sulfate dissolved in the waste acid mother liquor reaches saturation;

[0035] S2: Control the temperature of the waste acid mother liquor in which the aluminum sulfate obtained in step S1 reaches saturation at 75°C, add ammonium bicarbonate to the above mother liquor to make the pH value 2.5, and add ammonium sulfate according to the content of aluminum sulfate in the solution to make the NH 4 + :Al 3+ :SO 4 2- The molar concentration ratio is ...

Embodiment 2

[0040] A kind of method utilizing activated clay waste acid mother liquor to prepare potassium alum, comprises the following steps:

[0041] S1: Use activated clay waste acid mother liquor to mix with bentonite, control the temperature of the solution at 100°C to dissolve the aluminum sulfate in bentonite in the waste acid mother liquor, and then circulate the activated clay waste acid mother liquor with increased concentration of aluminum sulfate with the newly added bentonite Mix and circulate 4 times in this way until the aluminum sulfate dissolved in the waste acid mother liquor reaches saturation;

[0042] S2: Control the temperature of the waste acid mother liquor in which the aluminum sulfate obtained in step S1 reaches saturation at 85° C., add activated clay waste acid mother liquor with a pH value of 2 to the above mother liquor to make the pH value 4, and add potassium sulfate to make K + :Al 3+ :SO 4 2- The molar concentration ratio is 1.04:1:2.05;

[0043] S3:...

Embodiment 3

[0047] A kind of method utilizing activated clay waste acid mother liquor to prepare sodium alum, comprises the following steps:

[0048] S1: Use activated clay waste acid mother liquor to mix with bentonite, control the temperature of the solution at 97°C to dissolve the aluminum sulfate in bentonite in the waste acid mother liquor, and then circulate the activated clay waste acid mother liquor with increased concentration of aluminum sulfate with the newly added bentonite Mix and circulate 3 times in this way until the aluminum sulfate dissolved in the waste acid mother liquor reaches saturation;

[0049] S2: Control the temperature of the waste acid mother liquor in which the aluminum sulfate obtained in step S1 reaches saturation at 80°C, add ammonium bicarbonate to the above mother liquor to make the pH value 3.2, add sodium sulfate to make Na + :Al 3+ :SO 4 2- The molar concentration ratio is 1.07:1:2.06;

[0050] S3: Filter the sodium alum solution generated by the ...

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Abstract

The invention discloses a method for preparing alum by utilization of activated clay waste acid mother solution, and belongs to the waste water processing and inorganic salt preparation technology fields. By utilization of multiple cycles of an activated clay waste acid mother solution and bentonite, dissolved aluminum sulfate reaches a saturation state, then a reaction with ammonium sulfate (potassium sulfate or sodium sulfate) is carried out, and alum with a purity of more than 99.2% is prepared after crystallization for two times. The aluminum element in the activated clay production waste water mother solution is utilized comprehensively, waste water and obtained gypsum reach industrial application requirements, and the foundation is laid for environmental protection and emission reduction of the next production link. In addition, the cost for preparing alum can be lowered and the production cycle can be shortened.

Description

【Technical field】 [0001] The invention relates to the technical field of waste water treatment and inorganic salt preparation, in particular to a method for preparing alum by using activated clay waste acid mother liquor. 【Background technique】 [0002] Activated clay is mainly used for the decolorization and refining of mineral oil, vegetable oil and animal fat. It is an important petrochemical and daily chemical raw material. Activated clay is made of bentonite as raw material, mainly processed by wet acidification process. The production process includes: hydration of bentonite, activation with sulfuric acid, water washing, drying and pulverization. Because the product contains a lot of acid, it needs to be washed repeatedly to make the acid content less than 0.2%, so as to meet the requirements of HG / T2569-94 product standard. Depending on the method, the amount of wastewater generated during the washing process varies to a certain extent, but the amount of wastewater ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/76
Inventor 梁福珏梁福瑜
Owner GUANGXI LONGAN RUIFENG IND TRADING CO LTD
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