Preparation method of magnesium slag modified gasification coarse slag phosphorus remover

Abstract

The present invention relates to the field of resource utilization of solid waste and sewage treatment, and particularly relates to a preparation method of a phosphorus-removing agent for modified gasification coarse slag with magnesium slag. The method is carried out according to the following steps: S1: Mix magnesium slag and gasification coarse slag in proportion, and mix and grind the mixture with sodium hydroxide particles; S2: Put the product obtained in step S1 into a muffle furnace for calcination; S3: Wash the product obtained in step S2 with deionized water until it is neutral, dry and grind it to obtain the target product, the phosphorus-removing agent for modified gasification coarse slag with magnesium slag. The raw materials used in the present invention are mainly solid wastes, the process is simple, the cost is low, and the obtained product, the phosphorus-removing agent for modified gasification coarse slag with magnesium slag, has a good adsorption capacity for phosphate ions in a wide pH range, especially in the medium-acidic condition, its adsorption capacity for phosphate ions is better.

Description

Technical Field

[0001] The present invention relates to the field of resource utilization of solid waste and sewage treatment, and particularly to a preparation method of a phosphorus removal agent based on gasification coarse slag modified by magnesium slag for hematite. Background Art

[0002] With the development and utilization of phosphorus resources by people, a large amount of phosphorus emissions have caused eutrophication of water bodies, posing a serious threat to the ecosystem and human health. Among many phosphorus removal technologies, the adsorption method has the advantages of simple process, stability and reliability, and good removal effect, and is considered to be one of the most favored methods. Developing adsorbents with wide raw material sources, low cost, and large adsorption capacity has become one of the keys to the large-scale application of this method.

[0003] In recent years, industrial solid wastes such as fly ash, red mud, and steel slag have been increasingly studied for their application in water pollution treatment due to their advantages such as large raw material reserves, easy availability, and low cost. However, there are few reports on the use of magnesium slag-modified gasification coarse slag for phosphorus removal in water. With the rapid development of the magnesium smelting industry and the coal chemical industry, the annual emissions of magnesium slag and gasification coarse slag are much greater than the annual digestion volume. The accumulation of a large amount of slag not only occupies a large amount of land but also brings potential hazards to the surrounding environment. Therefore, it is urgent and meaningful to develop resource utilization technologies for magnesium slag and gasification coarse slag. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: to provide a preparation method of a phosphorus removal agent based on magnesium slag-modified gasification coarse slag with easily available raw materials, simple process, and low cost, so as to provide a new technical idea for the resource utilization of industrial solid waste and the treatment of phosphorus-containing wastewater.

[0005] To solve the above problems, the present invention provides a new technical solution: a preparation method of a phosphorus removal agent based on magnesium slag-modified gasification coarse slag, which is carried out according to the following steps:

[0006] S1: Mix magnesium slag and gasification coarse slag in proportion, and mix and grind the mixture with sodium hydroxide particles;

[0007] S2: Put the product obtained in step S1 into a muffle furnace for calcination;

[0008] S3: Wash the product obtained in step S2 with deionized water until neutral, dry and grind to obtain the target product, a phosphorus removal agent based on magnesium slag-modified gasification coarse slag.

[0009] Further, in step S1, the mass ratio of magnesium slag to gasification coarse slag in the mixture is 1-3:1.

[0010] Further, in step S1, the mass of sodium hydroxide is 1 / 2 of the mass of the mixture.

[0011] Further, the calcination temperature in step S2 is 300 - 500 °C; the calcination duration is 2.5 - 4.5 h.

[0012] Further, the drying temperature in step S3 is 90 - 120 °C.

[0013] Weigh 0.05 g of the prepared magnesium slag modified gasification coarse slag phosphorus removal agent and add it to 50 mL of phosphorus wastewater with a concentration of 45 mg / L. Adjust the initial pH of the mixed solution to 3 - 10, react for 20 h, and use the ammonium molybdate spectrophotometric method of GB11893 - 89 to measure the remaining phosphorus concentration in the wastewater, so as to obtain the adsorption capacity of the magnesium slag modified gasification coarse slag phosphorus removal agent for phosphate ions.

[0014] The beneficial effects of the present invention are as follows: The raw materials used in the present invention are mainly solid wastes, the process is simple, and the cost is low. The obtained product, the magnesium slag modified gasification coarse slag phosphorus removal agent, has a good adsorption capacity for phosphate ions in a wide pH range, especially under medium - acidic conditions, its adsorption capacity for phosphate ions is better. The present invention uses magnesium slag to modify gasification coarse slag to remove phosphorus in water, which can not only realize the resource utilization of solid wastes, but also realize the treatment of phosphorus - containing wastewater, and has great practical significance for the secondary development and utilization of waste resources and environmental protection. Description of the Drawings

[0015] Figure 1 is a comparison chart of the phosphate ion adsorption capacity between the magnesium slag modified gasification coarse slag phosphorus removal agent and the original gasification coarse slag;

[0016] Figure 2 is a relationship chart between the phosphate ion adsorption capacity of the magnesium slag modified gasification coarse slag phosphorus removal agent and pH. Detailed Embodiments

[0017] The following further illustrates the present invention in conjunction with embodiments. However, the present invention is not limited to the following embodiments. Embodiment 1

[0018] A preparation method of a magnesium slag modified gasification coarse slag phosphorus removal agent:

[0019] 1) Weigh 2 g of magnesium slag and 1 g of gasification coarse slag, and mix them according to the mass ratio of magnesium slag to gasification coarse slag of 2:1;

[0020] 2) Weigh 1.5 g of sodium hydroxide particles, which is half of the total mass in step 1), and mix and grind them;

[0021] 3) Put the obtained product into a muffle furnace and calcine it at 500 °C for 4.5 h;

[0022] 4) Wash the product obtained in step 3) with deionized water until it is neutral, dry it at 110 °C and grind it to obtain the target product, the magnesium slag modified gasification coarse slag phosphorus removal agent.

[0023] 5) Weigh 0.05 g of the prepared magnesium slag modified gasification coarse slag phosphorus removal agent and add it to 50 mL of phosphorus wastewater with a concentration of 45 mg / L. Adjust the initial pH of the mixed solution to 6, react for 20 h, and use the ammonium molybdate spectrophotometric method of GB11893-89 to measure the remaining phosphorus concentration in the wastewater. The average adsorption capacity is obtained as 44.76 mg / g.

[0024] Example 2

[0025] A preparation method of a magnesium slag modified gasification coarse slag phosphorus removal agent:

[0026] 1) Weigh 2 g of magnesium slag and 1 g of gasification coarse slag, and mix them according to the mass ratio of magnesium slag to gasification coarse slag of 2:1;

[0027] 2) Weigh 1.5 g of sodium hydroxide particles, which is half of the total mass in step 1), and mix and grind them;

[0028] 3) Put the obtained product into a muffle furnace and calcine it at 300 °C for 3.5 h;

[0029] 4) Wash the product obtained in step 3) with deionized water until it is neutral, dry it at 110 °C and grind it to obtain the target product, the magnesium slag modified gasification coarse slag phosphorus removal agent.

[0030] 5) Weigh 0.05 g of the prepared magnesium slag modified gasification coarse slag phosphorus removal agent and add it to 50 mL of phosphorus wastewater with a concentration of 45 mg / L. Adjust the initial pH of the mixed solution to 6, react for 20 h, and use the ammonium molybdate spectrophotometric method of GB11893-89 to measure the remaining phosphorus concentration in the wastewater. The average adsorption capacity is obtained as 42.22 mg / g.

Claims

1. A preparation method of a phosphorus removal agent modified by magnesium slag for gasification coarse slag, characterized in that Proceed as follows: S1: Mix magnesium slag and gasification coarse slag in proportion, and mix and grind the mixture with sodium hydroxide particles; S2: Put the product obtained in step S1 into a muffle furnace for calcination; S3: Wash the product obtained in step S2 with deionized water until neutral, dry and grind to obtain the target product, magnesium slag modified gasification coarse slag phosphorus removal agent.

2. The preparation method of a phosphorus removal agent from magnesium slag modified gasification coarse slag according to claim 1, characterized in that, In step S1, the mass ratio of magnesium slag to gasification coarse slag in the mixture is 1 - 3:

1.

3. The preparation method of a phosphorus removal agent for modified gasification coarse slag with magnesium slag as claimed in claim 1, characterized in that, In step S1, the mass of sodium hydroxide is 1 / 2 of the mass of the mixture.

4. The preparation method of a phosphorus removal agent from magnesium slag modified gasification coarse slag according to claim 1, characterized in that In step S2, the calcination temperature is 300 - 500 °C; the calcination duration is 2.5 - 4.5 h.

5. The preparation method of a phosphorus removal agent for modified gasification coarse slag with magnesium slag as claimed in claim 1, wherein, In step S3, the drying temperature is 90 - 120 °C.

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