Method for preparing potassium alum with aluminum-contained waste catalyst generated from petrochemical production

A catalyst and a technology of potassium alum, which is applied in the field of preparing potassium alum from aluminum-containing waste catalysts, can solve problems such as potassium alum that have not been seen before, and achieve the effects of simple process steps, saving resources, and reducing the cost of three wastes treatment

Inactive Publication Date: 2017-06-27
CHANGSHU INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] But in open Chinese and foreign patents and non-patent literature, all do not see the technical information that utilizes petrochemical enterprises to produce in the process such as catalytic cracking and the like to produce the technical information of potassium alum by the aluminum-containing waste catalyst, for this reason the applicant has made a positive contribution Exploration and repeated experiments, the technical solutions to be introduced below are produced under this background

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A) Prepare the aluminum sulfate leaching solution, which comes from petrochemical enterprises, that is, from petrochemical enterprises in the production process such as the catalytic cracking process, and is introduced into an oven and dried at 115 ° C for 8 hours and then dried to a moisture content of 4%. The waste catalyst containing aluminum with a mass % content of 30% is put into a reactor with a heating device and a stirring device, and sulfuric acid with a mass % specific concentration of 23% is added to the reactor, and the heating temperature of the heating device is 120 ° C And the stirring speed of the stirring device is 400r / min under stirring reaction 15h, control the Al in the reaction system 3+ with SO 4 2- The mol ratio is 1: 1.5, obtains aluminum sulfate leaching solution;

[0026] B) To prepare crude potassium alum filter cake, put the aluminum sulfate leaching solution obtained in step A) into the reaction kettle and add saturated potassium sulfate...

Embodiment 2

[0030] Only change the temperature and drying time of the oven in step A) to 125°C and 6h respectively, change the moisture content of the dried aluminum-containing waste catalyst to 3%, and change the mass % content of aluminum in the aluminum-containing waste catalyst to 20 %, the mass % ratio concentration of sulfuric acid was changed to 40%, the heating temperature was changed to 85°C, the stirring speed was changed to 415r / min, the stirring reaction time was changed to 5h, Al 3+ with SO 4 2- Change the mol ratio of 1:1.6; only change the heating temperature of the reactor described in step B) to 90°C, change the stirring speed of the stirring device to 480r / min, change the stirring reaction time to 0.5h, and change K + 、Al 3+ and SO 4 2- The molar concentration ratio of the three is changed into 1.2: 1: 2.07, the cooling crystallization temperature is changed into 8 ℃, the filter pressure is changed into 0.8MPa, and the water content of the thick potassium alum filt...

Embodiment 3

[0033] Only change the temperature and drying time of the oven in step A) to 118°C and 7h respectively, change the moisture content of the aluminum-containing waste catalyst to 2.5% after drying, and change the mass % content of aluminum in the aluminum-containing waste catalyst to was 25%, the mass % specific concentration of sulfuric acid was changed to 16%, the heating temperature was changed to 100°C, the stirring speed was changed to 450r / min, the stirring reaction time was changed to 18h, and the Al 3+ with SO 4 2- Change the mol ratio of 1:1.4; only change the heating temperature of the reactor described in step B) to 88°C, change the stirring speed of the stirring device to 400r / min, change the stirring reaction time to 2h, and change the K + 、Al 3+ and SO 4 2- The molar concentration ratio of the three is changed into 1.5: 1: 2.06, the cooling crystallization temperature is changed into 7 DEG C, the filter press pressure is changed into 0.85MPa, and the water con...

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Abstract

The invention discloses a method for preparing potassium alum with an aluminum-contained waste catalyst generated from petrochemical production. The method includes: adding sulfuric acid to the aluminum-contained waste catalyst subjected to drying treatment and generated from the production process of a petrochemical enterprise, performing stirring reaction under heating, controlling the mol ratio of Al<3+> to SO4<2> in a reaction system to obtain an aluminum sulfate extract; feeding the obtained aluminum sulfate extract to a reaction kettle, heating to add a saturated sulphate solution, performing stirring reaction, controlling the molar feed ratio of K<+> to Al<3+> to SO4<2> in a reaction system, performing immediate filtration to obtain a filtrate, and performing cooling crystallization and filtration to obtain a coarse potassium alum filter cake with the filtrate to be treated; crushing the coarse potassium alum filter cake, and washing the crushed coarse potassium alum filter cake by adding water to obtain the potassium-alum finished product via filtration and centrifugal dewatering. With the method, resources are saved, environment is protected, and resources are recycled; the method is simple in step and free of relying on expensive experiment and being constrained by rigorous process elements.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment and preparation of inorganic salts, and in particular relates to a method for preparing potassium alum from aluminum-containing waste catalysts produced in the production of petrochemical enterprises. Background technique [0002] Aluminum-containing waste catalyst is a hazardous solid waste, and its precursor is the carrier of reforming catalysts in the petrochemical industry. With the sustained and rapid development of my country's economy, the petrochemical industry, one of the important pillars supporting my country's economy, is expanding day by day, and the accompanying solid waste discharge is seriously polluting the increasingly fragile ecological environment. At present, the common treatment methods are stacking and landfilling, which cause soil pollution and waste of land resources, and the elements with extremely high recycling value are also discarded involuntarily. [0...

Claims

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Application Information

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IPC IPC(8): C01F7/76
CPCC01F7/762C01P2006/82
Inventor 曾小君陆一鸣杨高文孙鹏鹏李跃康
Owner CHANGSHU INSTITUTE OF TECHNOLOGY
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