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Preparation method of ammonium alum by using waste catalyst as raw material

A waste catalyst and ammonium alum technology, applied in chemical instruments and methods, inorganic chemistry, aluminum compounds, etc., can solve the problems of cumbersome process and many operation steps, and achieve the effects of simple process steps, environmental protection and resource saving

Inactive Publication Date: 2017-08-18
CHANGSHU INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are problems such as many operation steps and complicated process.
Another example CN105502455A provides "a method for preparing ammonium alum by utilizing kaolin beneficiation acid wastewater", which utilizes kaolin beneficiation acid wastewater and kaolin for multiple cycles to make the dissolved aluminum sulfate in it reach saturation, and then react with ammonium sulfate, Two times of crystallization to obtain ammonium alum. This patent application scheme realizes the recycling of mineral processing waste acid water, but there are also problems such as many operation steps and cumbersome process.

Method used

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  • Preparation method of ammonium alum by using waste catalyst as raw material

Examples

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Effect test

Embodiment 1

[0024] according to figure 1 Shown flow process is that the step that raw material prepares ammonium alum with spent catalyst is as follows:

[0025] A) prepare aluminum sulfate crude liquid, add the sulfuric acid that mass % ratio concentration is 25% to soak a week in petrochemical industry in the production process such as the mass % content of the aluminum that produces in the catalytic cracking process of petroleum that is 30% aluminum-containing waste catalyst, Specifically, it is advisable to put the aluminum-containing waste catalyst from the aforementioned industries (petrochemical industry) into a immersion pool filled with sulfuric acid and submerge the aluminum-containing waste catalyst with sulfuric acid. (Equipped with) a container with a stirring device and a heating device, such as a reactor, and the stirring reaction is performed with the stirring device and the heating device turned on. The stirring speed of the stirring device is controlled at 2100rpm, and t...

Embodiment 2

[0030] Only change the mass % content of aluminum in the aluminum-containing waste catalyst in step A) to 10%, change the mass % specific concentration of sulfuric acid to 30%, change the stirring speed of the stirring device to 100rpm, and change the stirring reaction time Change it to 6h, change the heating temperature, that is, the reaction temperature to 120°C; change the stirring speed in step B) to 4000rpm, change the heating temperature, that is, the reaction temperature to 80°C, change the reaction time to 35min, and mix concentrated ammonia water and sulfuric acid Change the mass ratio of aluminum crude liquid to 0.05:1, change the mass % ratio concentration of concentrated ammonia water to 27%; change the crystallization reaction temperature in step C) to 15°C, and change the time of crystallization reaction to 40min; The temperature of the cold water in D) was changed to 15°C, and the rest were the same as those described in Example 1.

Embodiment 3

[0032] Only change the mass % content of aluminum in the aluminum-containing waste catalyst in step A) to 50%, change the mass % specific concentration of sulfuric acid to 40%, change the stirring speed of the stirring device to 4000rpm, and change the time of the stirring reaction Change it to 20h, change the heating temperature, that is, the reaction temperature to 110°C; change the stirring speed in step B) to 2000rpm, change the heating temperature, that is, the reaction temperature, to 82°C, change the reaction time to 32min, and mix concentrated ammonia water and sulfuric acid Change the mass ratio of aluminum crude liquid to 0.5:1, change the mass % ratio concentration of concentrated ammonia water to 26%; change the crystallization reaction temperature in step C) to 12°C, and change the time of crystallization reaction to 60min; The temperature of the cold water in D) was changed to 10°C, and the rest were the same as those described in Example 1.

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Abstract

The invention discloses a preparation method of ammonium alum by using waste catalyst as a raw material. The method includes steps of adding and immersing sulfuric acid in an aluminum-containing waste catalyst during the production process of a petrochemical industry; after immersing, feeding to a container arranged with a mixer and a heater, and mixing the catalyst under an opening state; after finishing the mixing reaction, centrifugally separating the catalyst by a centrifugal separator to obtain a crude fluid of aluminum sulfate; adding stronger ammonia water in the obtained crude fluid of aluminum sulfate; neutralizing the crude fluid under the state of mixing and heating; controlling the mixing speed of the mixer, the heating temperature of the heater, the neutralization time and the pH value of the reaction system so as to obtain the crude fluid of aluminum sulfate; feeding the obtained crude fluid of crude fluid of aluminum sulfate to a crystalizing pond to crystalize and then perform pressing filter to obtain a crude ammonium alum filter cake; spraying the crude ammonium alum filter cake and controlling the spraying degree; air-drying the filter cake to obtain the finished ammonium alum. The preparation method has the advantages of meeting the requirement of industrial preparation, saving resource, and protecting environment; besides, the purity is ideal.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment and inorganic salt preparation, and in particular relates to a method for preparing ammonium alum by using waste catalyst as a raw material. Background technique [0002] The above-mentioned spent catalysts (also called aluminum-containing spent catalysts, the same below) mainly refer to, but are not absolutely limited to, the solid wastes rich in aluminum that are produced in the petrochemical industry during the production process such as catalytic cracking (customarily referred to as "solid waste"). Waste"). [0003] Petrochemical industry is one of the important pillars supporting my country's economy. In recent years, both the overall scale and actual production capacity have been expanding, so the annual waste catalysts are also increasing, currently reaching about 400,000 tons. Since the catalysts used in the petrochemical industry generally use alumina as the carrier and the...

Claims

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Application Information

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IPC IPC(8): C01F7/76
CPCC01F7/765C01P2006/80
Inventor 杨高文孙鹏鹏曾小君陆一鸣李跃康
Owner CHANGSHU INSTITUTE OF TECHNOLOGY
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