Method for co-production of aluminum potassium sulfate and gypsum through activated clay production mother liquid

A technology of activated clay and mother liquor, which is applied in chemical instruments and methods, multi-stage treatment of water/sewage, aluminum sulfate, etc., can solve the problems of high cost and long cycle of producing alum, and achieve increased economic benefits of enterprises, short cycle, and production. low cost effect

Inactive Publication Date: 2016-02-03
GUANGXI LONGAN RUIFENG IND TRADING CO LTD
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  • Summary
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  • Description
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Problems solved by technology

[0006] The invention provides a method for co-producing alum and gypsum by using activated clay to produce mother liquor, so as to solve the problems in t

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  • Method for co-production of aluminum potassium sulfate and gypsum through activated clay production mother liquid

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Embodiment 1

[0026] A kind of method utilizing activated clay to produce mother liquor to co-produce ammonium alum, gypsum, comprises the following steps:

[0027] S1: The activated clay production mother liquor is mixed with bentonite and then heated to dissolve the aluminum sulfate in the bentonite in the production mother liquor, and then the activated clay production mother liquor with increased aluminum sulfate concentration is circulated and mixed with the newly added bentonite, and the mother liquor is recycled according to this method 3 Second, control the temperature of dissolving aluminum sulfate to 95°C until the aluminum sulfate dissolved in the production mother liquor reaches saturation; control the temperature of the prepared saturated aluminum sulfate production mother liquor at 75°C, adjust the pH value to 2.5 with ammonium bicarbonate, add sulfuric acid Ammonium reacts to form ammonium alum, and the amount added makes NH 4 + :Al 3+ :SO 4 2- The molar concentration rat...

Embodiment 2

[0030] A kind of method utilizing activated clay to produce mother liquor co-production potassium alum, gypsum, comprises the following steps:

[0031] S1: The activated clay production mother liquor is mixed with bentonite and heated to dissolve the aluminum sulfate in the bentonite in the production mother liquor, and then the activated clay production mother liquor with increased aluminum sulfate concentration is circulated and mixed with the newly added bentonite, and the mother liquor is recycled according to this method 4 Second, control the temperature of dissolving aluminum sulfate to 100°C until the aluminum sulfate dissolved in the production mother liquor reaches saturation; control the temperature of the prepared saturated aluminum sulfate production mother liquor at 85°C, and use activated clay waste acid mother liquor with a pH of 1.5 to adjust the pH Value is 4, adding potassium sulfate reacts to generate potassium alum, and the added amount makes K + :Al 3+ :S...

Embodiment 3

[0034] A kind of method utilizing activated clay to produce mother liquor to co-produce sodium alum, gypsum, comprises the following steps:

[0035] S1: The activated clay production mother liquor is mixed with bentonite and then heated to dissolve the aluminum sulfate in the bentonite in the production mother liquor, and then the activated clay production mother liquor with increased aluminum sulfate concentration is circulated and mixed with the newly added bentonite, and the mother liquor is recycled according to this method 3 Second, control the temperature of dissolved aluminum sulfate to 98°C until the aluminum sulfate dissolved in the production mother liquor reaches saturation; control the temperature of the prepared saturated aluminum sulfate production mother liquor at 80°C, use ammonium bicarbonate to adjust the pH value to 3.2, add sulfuric acid Sodium reacts to generate sodium alum, and the added amount makes Na + :Al 3+ :SO 4 2- The molar concentration ratio i...

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Abstract

The invention discloses a method for co-production of aluminum potassium sulfate and gypsum through an activated clay production mother liquid, and belongs to the technical field of activated clay wastewater treatment and inorganic salt preparation. According to the method, through repeated cycling use of the activated clay production mother liquid and bentonite, aluminum sulphate dissolved in the activated clay production mother liquid is saturated, then the mixture is reacted with ammonium sulfate ( potassium sulfate or sodium sulfate), such steps as purification, crystallization, pressure filtration and water removal are performed to obtain high-purity aluminum potassium sulfate, and the obtained filtrate is subjected to neutralizing treatment through lime to prepare hydraulic and retardant gypsum. Through the method, activated clay wastewater is effectively treated, so that not only are aluminum elements in the mother liquid comprehensively utilized, but also gypsum prepared by wastewater neutralization meets the industrial application requirements, and purposes of energy conservation and emission reduction as well as changing waste into valuable are realized; meanwhile, the production cost of aluminum potassium sulfate is reduced, the production period is shortened, and the enterprise economic benefit is increased.

Description

【Technical field】 [0001] The invention belongs to the technical field of activated clay wastewater treatment and inorganic salt preparation, and in particular relates to a method for using activated clay to produce mother liquor and co-produce alum and gypsum. 【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 certai...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01F7/76C01F11/46
Inventor 梁福珏梁福瑜
Owner GUANGXI LONGAN RUIFENG IND TRADING CO LTD
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