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Method for preparing potassium alum by utilization of activated clay production waste water

A technology for the production of wastewater and activated clay, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as production efficiency, low purity, high production cost, and long cycle , to achieve the effect of process optimization, low production cost and short cycle

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

[0006] The invention provides a method for preparing potassium alum by using activated clay production wastewater to solve the problems in the prior art of preparing potassium alum from activated clay production wastewater, low production efficiency, low purity, high production cost, and long cycle.

Method used

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  • Method for preparing potassium alum by utilization of activated clay production waste water

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Effect test

Embodiment 1

[0022] A kind of method utilizing activated clay to produce waste water to prepare potassium alum, comprises the following steps:

[0023] S1: Add aluminum hydroxide to activated clay production wastewater, stir and dissolve aluminum hydroxide at a temperature of 80°C, add potassium sulfate to the above solution, and make K in the solution + :Al 3+ :SO 4 2- The molar ratio is 1:1:2, add potassium hydroxide solution to adjust the pH value to 3.2, filter the solution while it is hot to remove impurities, the resulting solution is cooled to 15°C to crystallize, and then press filter at a pressure of 0.9Mpa to obtain a filter cake crude potassium alum;

[0024] S2: Put the crude potassium alum into water, heat and stir to completely dissolve the crude potassium alum so that the mass concentration of the solution is 54%, remove impurities again while it is hot, and cool the obtained solution again to 15 ° C. After crystallization, the pressure is 0.9Mpa The filter cake was obta...

Embodiment 2

[0026] A kind of method utilizing activated clay to produce waste water to prepare potassium alum, comprises the following steps:

[0027] S1: Add aluminum hydroxide to activated clay production wastewater, stir and dissolve aluminum hydroxide at a temperature of 90°C, add potassium sulfate to the above solution, and make K in the solution + :Al 3+ :SO 4 2- The molar ratio is 1.08:1:2.08, add potassium hydroxide solution to adjust the pH value to 3.6, filter the solution while it is hot to remove impurities, the resulting solution is cooled at 13°C to crystallize, and then press filter at a pressure of 1.0Mpa to obtain a filter cake crude potassium alum;

[0028] S2: Put the crude potassium alum into water, heat and stir to completely dissolve the crude potassium alum and make the solution mass concentration 60%, remove impurities again while it is hot, and cool the obtained solution again to 13°C to crystallize, and then press it under a pressure of 0.9Mpa The filter cake...

Embodiment 3

[0030] A kind of method utilizing activated clay to produce waste water to prepare potassium alum, comprises the following steps:

[0031] S1: Add aluminum hydroxide to activated clay production wastewater, stir and dissolve aluminum hydroxide at a temperature of 85°C, add potassium sulfate to the above solution, and make K in the solution + :Al 3+ :SO 4 2- The molar ratio is 1.04:1:2.04, add potassium hydroxide solution to adjust the pH value to 3.4, filter the solution while it is hot to remove impurities, the resulting solution is cooled at 12°C to crystallize, and then press filter at a pressure of 0.95Mpa to obtain a filter cake crude potassium alum;

[0032] S2: Put the crude potassium alum into water, heat and stir to completely dissolve the crude potassium alum and make the solution mass concentration 57%, remove impurities again while it is hot, and cool the obtained solution again to 12°C for crystallization, and then press it under a pressure of 0.9Mpa Press fil...

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Abstract

The invention discloses a method for preparing potassium alum by utilization of activated clay production waste water, and belongs to the activated clay waste water processing and inorganic salt preparation technology fields. Sulfuric acid and aluminum sulfate in activated clay production waste water are reacted with aluminum hydroxide and potassium sulfate, and a potassium alum product with a purity of more than 99.5% is prepared after steps of impurity removal, crystallization, press filtration, dewatering and the like. Activated clay waste water can be processed effectively, sulfuric acid and aluminum sulfate in activated clay production waste water can be utilized fully, and purposes of energy saving, emission reduction and changing waste into valuables are achieved. When the method is compared with the prior art, potassium sulfate with a lower price is employed to replace potassium hydroxide, and the production cost is low. centrifuge dewatering is employed to replace heating dewatering, the production efficiency is high, and the cycle is short. Through technology optimization, the purity of potassium alum is high.

Description

【Technical field】 [0001] The invention relates to the fields of waste water treatment and preparation of inorganic salts, in particular to a method for preparing potassium alum from waste water produced by activated clay. 【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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IPC IPC(8): C01F7/76C02F9/08
Inventor 梁福珏
Owner GUANGXI LONGAN RUIFENG IND TRADING CO LTD
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