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Technology for purifying calcium oxide in phosphogypsum decomposition resides through sucrose method

A technology of phosphogypsum and calcium oxide, applied in the direction of calcium/strontium/barium oxide/hydroxide, solid waste removal, etc., can solve the problems of high cost, complicated operation, easy introduction of solid impurities, etc., and achieve production cost Low, high recycling rate, the effect of promoting comprehensive utilization

Inactive Publication Date: 2014-04-02
KUNMING UNIV OF SCI & TECH TECH IND SALES MANAGEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the continuous optimization of the production process, the production mode of calcium oxide is changing towards diversification, and the quality is gradually improving. However, looking at the above-mentioned processes, there are disadvantages such as high cost, complicated operation, and easy introduction of other solid impurities.

Method used

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  • Technology for purifying calcium oxide in phosphogypsum decomposition resides through sucrose method

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Effect test

Embodiment 1

[0023] Embodiment 1: the method for purifying calcium oxide in the phosphogypsum decomposition slag by sucrose method, concrete operations are as follows:

[0024] (1) Add sucrose solution to phosphogypsum decomposition slag, stir and react at 20°C for 30 minutes, filter, and collect the filtrate, wherein the mass ratio of phosphogypsum decomposition slag to sucrose solution is 1:6, and the concentration of sucrose solution is 150g / L;

[0025] (2) Pass pure carbon dioxide gas (99.99%) into the filtrate, stir and react at 70°C for 30 minutes, filter, collect the filter residue and dry at 100°C;

[0026] (3) After drying, the filter residue is calcined. During the calcination process, the preheating temperature is 250°C, preheating for 30 minutes, and then calcining at a calcination temperature of 1000°C for 3 hours, and then placed in a cooling zone. The temperature of the cooling zone is less than 350°C, and the temperature is lowered. The rate is 5°C / min. After cooling to r...

Embodiment 2

[0028] Embodiment 2: the method for purifying calcium oxide in phosphogypsum decomposition slag by sucrose method, concrete operation is as follows:

[0029] (1) Add sucrose solution to phosphogypsum decomposition slag, stir and react at 25°C for 30 minutes, filter, and collect the filtrate, wherein the mass ratio of phosphogypsum decomposition slag to sucrose solution is 1:8, and the concentration of sucrose solution is 200g / L;

[0030] (2) Pass pure carbon dioxide gas (99.99%) into the filtrate, stir and react at 100°C for 20 minutes, filter, collect the filter residue and dry at 100°C;

[0031] (3) After drying, the filter residue is calcined. During the calcination process, the temperature of the preheating zone is 300°C, preheating for 15 minutes, and then calcining at a calcination temperature of 900°C for 2 hours, and then placed in a cooling zone. The temperature of the cooling zone is less than 350°C. The temperature is 5°C / min. After cooling to room temperature, th...

Embodiment 3

[0033] Embodiment 3: the method for purifying calcium oxide in phosphogypsum decomposition slag by sucrose method, concrete operations are as follows:

[0034] (1) Add sucrose solution to phosphogypsum decomposition slag, stir and react at 23°C for 40 minutes, filter, and collect the filtrate, wherein the mass ratio of phosphogypsum decomposition slag to sucrose solution is 1:7, and the concentration of sucrose solution is 170g / L;

[0035](2) Pass pure carbon dioxide gas (99.99%) into the filtrate, stir and react at 150°C for 15 minutes, filter, collect the filter residue and dry at 100°C;

[0036] (3) After drying, the filter residue is calcined. During the calcination process, the temperature of the preheating zone is 280°C, preheating for 20 minutes, and then calcining at a calcination temperature of 800°C for 3.5 hours, and then placed in a cooling zone. The temperature of the cooling zone is less than 350°C, and the temperature is lowered. The rate is 5°C / min. After coo...

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Abstract

The invention which belongs to the phosphogypsum resource utilization field concretely discloses a technology for purifying calcium oxide in phosphogypsum decomposition resides through a sucrose method. The technology comprises the following steps: 1, processing the phosphogypsum decomposition residues through a sucrose solution, filtering, and letting in carbon dioxide; and 2, drying the material obtained in step 1, calcining, and cooling to obtain finished calcium oxide. Carbon dioxide generated in the purification process and the sucrose solution can be recycled. The highest purity of the purified calcium oxide can reach 98%, so the purified calcium oxide can be used as building gypsum, and also can be used for producing calcium-based downstream application products; and the purification technology of the invention provides a certain technical support for the phosphogypsum resource utilization, and has the advantages of low production cost, high cycle utilization rate, simplicity and easy operation of the process flow, and wide market prospect.

Description

technical field [0001] The invention specifically relates to a method for purifying calcium oxide in phosphogypsum decomposition slag by a sucrose method, and belongs to the resource application field of phosphogypsum. Background technique [0002] Phosphogypsum is the industrial waste slag discharged during the production of phosphoric acid by wet process. As an available resource, it is one of the solid wastes with the largest discharge in the chemical industry. For every ton of phosphate fertilizer produced, an average of 3.75 tons of phosphogypsum is produced. High-yield phosphogypsum contains a large amount of harmful substances such as soluble phosphorus, acid-insoluble substances, radioactive substances, fluorine, etc., while occupying a large amount of land resources, it also pollutes our living environment and seriously affects the normal growth of earth organisms. [0003] At present, the resource utilization of phosphogypsum is mainly used to produce cement clin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/16B09B3/00
Inventor 马丽萍戴取秀谢龙贵毛宇张杭
Owner KUNMING UNIV OF SCI & TECH TECH IND SALES MANAGEMENT