Magnetic rare earth barium ferrite nano purifying catalyst, as well as preparation method and application thereof

Abstract

The invention discloses a magnetic rare earth barium ferrite nano purifying catalyst, as well as a preparation method and application thereof. The catalyst is used for waste water treatment. The general formula of the catalyst is BaxReyMezFemOn, wherein x is 0.1-3.0, y is 0-2.0, z is 0-2, m is 1-24, n is 3-48, Me is Cu, Zn, Mn or Co, and Re is La, Ce, Nd, Pr, Sc or Y. The preparation method comprises the following steps: dissolving to prepare a solution, matching, mixing, carrying out high temperature ultrasonic dispersion for solation, carrying out microwave vacuum for gelation, carrying out microwave vacuum for denitration with less oxygen, and roasting; the method is characterized in that the high temperature ultrasonic dispersion, the microwave vacuum for gelation, the microwave vacuum for denitration with less oxygen and the roasting processes are performed after the matching and mixing processes. According to the invention, microwave vacuum for denitration with less oxygen is adopted to enable ammonium nitrate to be directly transformed into nitrogen, oxygen and water, no nitrogen oxide is generated during the preparation process, and secondary pollution caused by nitrogen oxide generated during a traditional preparation process is eliminated.

Description

technical field

[0001] The invention is used for the treatment of chemical oxygen demand (COD), sulfur-containing substances and nitrogen-containing substances in waste water of metallurgical industry and chemical industry, and specifically relates to a magnetic rare earth barium ferrite nano-purification catalyst. Background technique

[0002] In the sustainable development strategy of metallurgy and chemical industry, the low-cost purification treatment of waste water and waste gas is an important part. Most of the waste water and waste gas treatment needs to be completed through complex physical and chemical reaction processes, and most of these reactions need to be assisted by catalytic purifiers. For example, catalytic reactions of waste gas and waste liquid treatment require a large number of environmentally friendly catalytic purifiers. Environmentally friendly catalytic purifiers require high mechanical strength, high activity, strong anti-toxicity and stability, goo...

Examples

Embodiment 1

[0068] Embodiment 1: The preparation method of magnetic rare earth barium ferrite nano purification catalyst is as follows:

[0069] 1. Selected chemical substances and materials

[0070] The chemical substances and materials required for the preparation should be selected and controlled for quality and purity:

[0071]

[0072] 2. Clean the roaster

[0073] The roasting furnace for preparation and use should be cleaned, and the dust and harmful gas substances in the furnace should be removed with compressed air to make the furnace clean;

[0074] 3. Drying treatment

[0075] Weigh 200g±5g of neodymium oxide, place it in a quartz boat, and dry it in a vacuum drying oven at a drying temperature of 120°C±2°C, a vacuum degree of -18Pa, and a drying time of 30min;

[0076] 4. Prepare the solution

[0077] (1) Take by weighing 1 ± 0.001mol ferric nitrate nonahydrate and prepare 0.5 ± 0.001mol / L ferric nitrate solution in a 2000 milliliter volumetric flask with deionized wate...

Embodiment 2

[0106] What is different from Example 1 is that Fe in the ratio of raw material composition 3+ 、Ba 2+ 、Nd 3+ , (C 6 h 5 o 7 ) 3- The molar ratio is 9:0.8:0.2:20, the firing temperature of the firing process is 750°C, and the other processes are the same as in Example 1.

[0107] 1. Selected chemical substances and materials

[0108] The chemical substances and materials required for the preparation should be selected and controlled for quality and purity:

[0109]

[0110] 2. Clean the roaster

[0111] The roasting furnace for preparation and use should be cleaned, and the dust and harmful gas substances in the furnace should be removed with compressed air to make the furnace clean;

[0112] 3. Drying treatment

[0113] Weigh 200g±5g of neodymium oxide and place it in a quartz boat, and place the quartz boat in a vacuum drying oven to dry at a drying temperature of 120°C±2°C, a vacuum degree of -18Pa, and a drying time of 30min;

[0114] 4. Prepare the solution

...

Embodiment 3

[0146] The difference between this embodiment and embodiment 1 is that Fe in the raw material composition ratio 3+ 、Ba 2+ 、Nd3+ , (C 6 h 5 o 7 ) 3- The molar ratio of 2:0.9:0.1:6, using pickled elm rubber powder to carry out sol treatment, other processes are the same as in Example 1.

[0147] 1. Selected chemical substances and materials

[0148] The chemical substances required for preparation should be selected and quality purity controlled:

[0149]

[0150] 2. Clean the roaster

[0151] The roasting furnace for preparation and use should be cleaned, and the dust and harmful gas substances in the furnace should be removed with compressed air to make the furnace clean;

[0152] 3. Drying treatment

[0153] Weigh 200g±5g of neodymium oxide, place them in quartz boats, and dry them in a vacuum oven at a drying temperature of 120°C±2°C, a vacuum degree of -18Pa, and a drying time of 30min;

[0154] 4. Preparation of pickling elm rubber powder

[0155] ①Choose five...

technical field

[0001] The invention is used for the treatment of chemical oxygen demand (COD), sulfur-containing substances and nitrogen-containing substances in waste water of metallurgical industry and chemical industry, and specifically relates to a magnetic rare earth barium ferrite nano-purification catalyst. Background technique

[0002] In the sustainable development strategy of metallurgy and chemical industry, the low-cost purification treatment of waste water and waste gas is an important part. Most of the waste water and waste gas treatment needs to be completed through complex physical and chemical reaction processes, and most of these reactions need to be assisted by catalytic purifiers. For example, catalytic reactions of waste gas and waste liquid treatment require a large number of environmentally friendly catalytic purifiers. Environmentally friendly catalytic purifiers require high mechanical strength, high activity, strong anti-toxicity and stability, goo...

Examples

Embodiment 1

[0068] Embodiment 1: The preparation method of magnetic rare earth barium ferrite nano purification catalyst is as follows:

[0069] 1. Selected chemical substances and materials

[0070] The chemical substances and materials required for the preparation should be selected and controlled for quality and purity:

[0071]

[0072] 2. Clean the roaster

[0073] The roasting furnace for preparation and use should be cleaned, and the dust and harmful gas substances in the furnace should be removed with compressed air to make the furnace clean;

[0074] 3. Drying treatment

[0075] Weigh 200g±5g of neodymium oxide, place it in a quartz boat, and dry it in a vacuum drying oven at a drying temperature of 120°C±2°C, a vacuum degree of -18Pa, and a drying time of 30min;

[0076] 4. Prepare the solution

[0077] (1) Take by weighing 1 ± 0.001mol ferric nitrate nonahydrate and prepare 0.5 ± 0.001mol / L ferric nitrate solution in a 2000 milliliter volumetric flask with deionized wate...

Embodiment 2

[0106] What is different from Example 1 is that Fe in the ratio of raw material composition 3+ 、Ba 2+ 、Nd 3+ , (C 6 h 5 o 7 ) 3- The molar ratio is 9:0.8:0.2:20, the firing temperature of the firing process is 750°C, and the other processes are the same as in Example 1.

[0107] 1. Selected chemical substances and materials

[0108] The chemical substances and materials required for the preparation should be selected and controlled for quality and purity:

[0109]

[0110] 2. Clean the roaster

[0111] The roasting furnace for preparation and use should be cleaned, and the dust and harmful gas substances in the furnace should be removed with compressed air to make the furnace clean;

[0112] 3. Drying treatment

[0113] Weigh 200g±5g of neodymium oxide and place it in a quartz boat, and place the quartz boat in a vacuum drying oven to dry at a drying temperature of 120°C±2°C, a vacuum degree of -18Pa, and a drying time of 30min;

[0114] 4. Prepare the solution

...

Embodiment 3

[0146] The difference between this embodiment and embodiment 1 is that Fe in the raw material composition ratio 3+ 、Ba 2+ 、Nd3+ , (C 6 h 5 o 7 ) 3- The molar ratio of 2:0.9:0.1:6, using pickled elm rubber powder to carry out sol treatment, other processes are the same as in Example 1.

[0147] 1. Selected chemical substances and materials

[0148] The chemical substances required for preparation should be selected and quality purity controlled:

[0149]

[0150] 2. Clean the roaster

[0151] The roasting furnace for preparation and use should be cleaned, and the dust and harmful gas substances in the furnace should be removed with compressed air to make the furnace clean;

[0152] 3. Drying treatment

[0153] Weigh 200g±5g of neodymium oxide, place them in quartz boats, and dry them in a vacuum oven at a drying temperature of 120°C±2°C, a vacuum degree of -18Pa, and a drying time of 30min;

[0154] 4. Preparation of pickling elm rubber powder

[0155] ①Choose five...

Images