Comprehensive utilization method of acidic organic wastewater neutralization slag of dye factory

Abstract

The invention belongs to the technical field of dye industrial wastewater treatment, and particularly relates to a comprehensive utilization method of acidic organic wastewater neutralization slag of a dye factory, which comprises the following steps: taking the neutralization slag as a raw material, matching with clay, and firing into a waste slag brick masonry; according to the method for preparing the waste residue clay brick, the pollution possibly caused by organic matters in the waste residue to the environment can be effectively removed, meanwhile, effective components such as magnesium oxide in the waste residue are recycled, and resource waste is avoided; the waste residue clay brick prepared by the invention completely meets the national standard requirement (greater than 7.5 Mpa) on sintered brick masonry, can be used as a building material, and is low in equipment investment, simple in process and easy to operate.

Description

Technical Field

[0001] The invention belongs to the technical field of dye industry wastewater treatment, in particular to a method for comprehensively utilizing neutralized residues in acidic organic wastewater from dye factories. Background Art

[0002] Dye factories produce a large amount of acidic organic wastewater during the production process. These wastewaters usually contain high concentrations of organic pollutants, suspended solids, heavy metal ions and other harmful substances, such as chromium and copper. The pH value of these wastewaters is low and acidic, mainly due to the addition of acidic substances during the dyeing process. In addition, dye factory wastewater also contains a large amount of dyes, auxiliaries and other chemical substances, resulting in dark chromaticity, high chemical oxygen demand (COD) and biochemical oxygen demand (BOD) of the wastewater, causing serious pollution to the environment.

[0003] In view of the characteristics of acidic organic wastewater, traditional treatment methods mainly include physical method, chemical method, biological method and membrane separation technology, etc. However, these treatment methods often produce a large amount of neutralization residue during the treatment process. If these neutralization residues are directly discharged, it will not only cause secondary pollution to the environment, but also waste resources.

[0004] Therefore, in view of the above problems, a comprehensive utilization method of neutralized residue in acidic organic wastewater from dye factories is proposed. Summary of the invention

[0005] 1. Technical issues to be solved

[0006] In view of the deficiencies of the prior art, the present invention provides a method for comprehensive utilization of neutralized residues in acidic organic wastewater from a dye factory, so as to solve the problems raised in the background technology.

[0007] (II) Technical solution

[0008] To achieve the above purpose, the present invention provides the following technical solution: a method for comprehensive utilization of neutralization residues in acidic organic wastewater from a dye factory, which uses the neutralization residues as raw materials, mixes with clay, and burns them into waste residue brick masonry.

[0009] Preferably, the waste slag brick masonry is composed of the following raw materials in parts by weight:

[0010] 1 part of neutralized slag, 4 parts of clay and 1.6-2 parts of water

[0011] Wherein, the clay is measured as absolute dry clay.

[0012] Preferably, the raw materials are ground after mixing until there are no particles.

[0013] Preferably, the raw materials are mixed and placed in a mold for shaping, and then demoulded and dried and fired in a muffle furnace at 1100° C. for a total of 56 hours.

[0014] Preferably, the muffle furnace gradient heating process includes:

[0015] 200℃ for 2 hours, 400℃ for 6 hours, 600℃ for 16 hours, 800℃ for 24 hours, 1100℃ for 8 hours.

[0016] Preferably, the neutralized slag contains 25% moisture, 20% organic matter, and 20% a mixture of magnesium oxide, magnesium salt, calcium oxide, and iron.

[0017] (III) Beneficial effects

[0018] Compared with the prior art, the present invention provides a comprehensive utilization method of neutralized residue in acidic organic wastewater from dye factories, which has the following beneficial effects:

[0019] 1. The method for making waste residue clay bricks of the present invention can effectively remove the possible environmental pollution caused by organic matter in the waste residue, and at the same time, it also recycles the effective components such as magnesium oxide in the waste residue, thus avoiding the waste of resources.

[0020] 2. The waste clay bricks made by the present invention fully meet the national standard requirements for sintered brick masonry (>7.5Mpa), can be used as building materials, and have low equipment investment and simple and easy operation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0022] Figure 1 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Specific examples are given below.

[0025] Example 1

[0026] 1. Drying and crushing: Dry and crush 0.66kg of wastewater neutralization residue and 1.54kg of clay to a certain fineness;

[0027] 2. Mixing and blanking: Mix the clay and waste residue thoroughly, add 0.7kg of water and knead to make brick blanks;

[0028] 3. Air drying: The bricks are naturally air dried in a cool place;

[0029] 4. Firing: Step-by-step heating to 1100℃, fired into bricks; gradient heating, keep 200℃ for 2 hours, 400℃ for 6 hours, 600℃ for 16 hours, 800℃ for 24 hours, 1100℃ for 8 hours; brick specifications: 100mmx100mmx45mm;

[0030] The compressive strength of bricks can reach: 4.4MPa;

[0031] Control example: Commercially available clay bricks, compressive strength: 9.1 MPa.

[0032] Example 2

[0033] 1. Drying and crushing: Dry and crush 0.55kg of neutralized residue and 1.65kg of clay in the wastewater to a certain fineness;

[0034] 2. Mixing and making bricks: Mix the clay and waste residue thoroughly, add 0.7kg of water and knead to make bricks; 3. Air drying: The bricks are naturally air dried in a cool place;

[0035] 4. Firing: Step-by-step heating to 1100℃, fired into bricks; gradient heating, keep 200℃ for 2 hours, 400℃ for 6 hours, 600℃ for 16 hours, 800℃ for 24 hours, 1100℃ for 8 hours; brick specifications: 100mmx100mmx45mm;

[0036] The compressive strength of bricks can reach: 5.13MPa;

[0037] Control example: Commercially available clay bricks, compressive strength: 9.1MPa.

[0038] Example 3

[0039] 1. Drying and crushing: Dry and crush 0.44kg of wastewater neutralization residue and 1.76kg of clay to a certain fineness;

[0040] 2. Mixing and blanking: Mix the clay and waste residue thoroughly, add 0.7kg of water and knead to make brick blanks;

[0041] 3. Air drying: The bricks are naturally air dried in a cool place;

[0042] 4. Firing: Step-by-step heating to 1100℃, fired into bricks; gradient heating, keep 200℃ for 2 hours, 400℃ for 6 hours, 600℃ for 16 hours, 800℃ for 24 hours, 1100℃ for 8 hours; brick specifications: 100mmx100mmx45mm;

[0043] The compressive strength of bricks can reach: 8.84MPa;

[0044] Control example: Commercially available clay bricks, compressive strength: 9.1MPa.

[0045] Testing method: The testing method of the present invention refers to the national standard testing method: GB / T5486, compressive strength test method, GB55007-21.

[0046] The product of the present invention can achieve the following indicators:

[0047] Minimum strength grade of bulk material

[0048]

[0049] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A method for comprehensive utilization of neutralized residues in acidic organic wastewater from dye factories, characterized in that: The neutralized slag is used as raw material and mixed with clay to be fired into waste slag brick masonry.

2. The method for comprehensive utilization of neutralized slag in acidic organic wastewater from a dye factory according to claim 1, characterized in that: The waste slag brick masonry is composed of the following raw materials in parts by weight: 1 part of neutralized slag, 4 parts of clay and 1.6-2 parts of water Wherein, the clay is measured as absolute dry clay.

3. The method for comprehensive utilization of neutralized slag in acidic organic wastewater from a dye factory according to claim 2, characterized in that: The raw materials are mixed and ground until there are no particles.

4. The method for comprehensive utilization of neutralized slag in acidic organic wastewater from a dye factory according to claim 3, characterized in that: The raw materials are mixed and placed in a mold for shaping. After demoulding and drying, they are fired in a muffle furnace at 1100°C for a total of 56 hours.

5. The method for comprehensive utilization of neutralized residues in acidic organic wastewater from a dye factory according to claim 4, characterized in that: The muffle furnace gradient heating process includes: 200℃ for 2 hours, 400℃ for 6 hours, 600℃ for 16 hours, 800℃ for 24 hours, 1100℃ for 8 hours.

6. The method for comprehensive utilization of neutralized residues in acidic organic wastewater from a dye factory according to claim 1, characterized in that: The neutralized slag contains a mixture of 25% moisture, 20% organic matter, and 20% magnesium oxide, magnesium salt, calcium oxide, and iron.

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