A gel material prepared using arsenic-containing solid waste and its preparation method and application

Abstract

The present invention discloses a gel material prepared by using arsenic-containing solid waste, and a preparation method and application thereof. The gel material prepared by using arsenic-containing solid waste is prepared by using arsenic-containing solid waste and waste residue as raw materials through ultrasonic oil bath, iron-containing phase lifting and sintering steps. The present invention solves the problems of poor arsenic adsorption effect in sewage, difficulty in removing arsenic, high difficulty in treatment and high cost, and a large amount of arsenic-containing solid waste in the environment cannot be treated, and storage pollutes the environment. At the same time, the arsenic-containing solid waste is used to form a gelling material as a matrix, so that the solid waste is utilized to treat waste with waste.

Description

Technical Field

[0001] The present invention belongs to the technical field of recycling arsenic-containing solid waste, and specifically relates to a gel material prepared by utilizing arsenic-containing solid waste, and a preparation method and application thereof. Background Art

[0002] Metakaolin, blast furnace slag, and desulfurized gypsum are all industrial solid wastes. The amount of these solid wastes is very huge. The stacking of these industrial wastes not only wastes a lot of land resources, but also leads to serious environmental problems such as groundwater pollution and soil pollution. Metakaolin is a chemically active artificial volcanic ash material after calcining kaolin under appropriate temperature conditions. my country has abundant kaolin resources. Blast furnace slag, an industrial solid waste produced by non-ferrous metal smelters, has potential active ingredients and can provide Ca, SiO2, Al2O3, etc. to promote the formation of hydrated calcium silicate and aluminum silicate when cementitious materials are formed. Flue gas desulfurization gypsum from large coal-fired enterprises only transforms the pollution form, but does not fundamentally solve the pollution of sulfur dioxide. As a by-product, desulfurized gypsum is increasingly stringent in the country. Research on the comprehensive utilization of solid waste resources is imperative. Arsenic-containing solid waste is associated with other minerals, posing a safety hazard to human health. How to achieve safe and stable solidification and disposal of arsenic-containing solid waste is crucial. Therefore, it is very necessary to develop a method that can solve the above problems. Summary of the invention

[0003] The present invention solves the problems of poor arsenic adsorption effect in sewage, difficulty in removing arsenic, great difficulty and high cost in treatment, large amount of arsenic-containing solid waste in the environment cannot be treated, and storage pollutes the environment. At the same time, arsenic-containing solid waste is used to form a gelling material as a matrix to utilize the solid waste and treat waste with waste.

[0004] The first purpose of the present invention is to provide a gel material prepared using arsenic-containing solid waste; the second purpose is to provide a method for preparing a gel material prepared using arsenic-containing solid waste; and the third purpose is to provide an application of a gel material prepared using arsenic-containing solid waste.

[0005] The first object of the present invention is achieved in that the gel material prepared using arsenic-containing solid waste is prepared using arsenic-containing solid waste and waste residue as raw materials through ultrasonic oil bath, iron-containing phase enhancement and sintering steps.

[0006] The second object of the present invention is achieved by comprising ultrasonic oil bath, iron-containing phase lifting and sintering steps, specifically comprising:

[0007] A. Ultrasonic oil bath:

[0008] 1) Mixing and stirring the arsenic-containing solid waste and waste residue in a prescribed ratio, and then adding an activator to obtain material a;

[0009] 2) placing material a in an oil bath and agglomerating arsenic under ultrasonic stirring to obtain material b; the role of ultrasonic stirring is to help the formation of Si-O-Al-O-Si-O bonds;

[0010] B. Improving the iron-containing phase: immersing material b into an iron-containing solution to improve the iron-containing phase to obtain material c;

[0011] C. Sintering: Material c is sintered to obtain the target gel material prepared from arsenic-containing solid waste. The purpose of sintering is to partially dehydrate the internal pellets and firmly combine Fe with the gel material.

[0012] The third object of the present invention is achieved by using the gel material prepared from arsenic-containing solid waste in the preparation of an arsenic adsorbent in sewage.

[0013] Beneficial effects of the present invention:

[0014] 1. The iron on the surface of the pellets and the arsenic in the sewage form Fe-As precipitation, solidifying the arsenic, and then combine with Si-O-Al-O-Al-Si and other inorganic non-metallic gelling materials inside the pellets. The arsenic in the sewage can be adsorbed on the surface of Si-O-Al-O-Al-Si to solidify the arsenic.

[0015] 2. The combination and arrangement of the pellets can increase the contact surface area, allowing the sewage to be adsorbed on the surface when it flows through the pellets. The pellets are densely stacked according to their size, and the smaller pellets are filled in the middle of the large pellets. After completion, the small pellets can be vibrated to fill the small pores. Small particles can also be added at the end of the preparation process and fill the pores after vibration. When the sewage flows through the pellets, the contact area is increased.

[0016] 3. Ultrasonic oil bath is a new method of making balls. The oil bath can make the gelled material float in the middle of the ball, and the ball is more uniform. Ultrasonic waves can make the metal ions in the waste slag move in a directional manner, help Si-O-Al-O-Al-Si bond, and better fix arsenic. The internal arsenic is fixed inside the ball, and at the same time, the arsenic is adsorbed by Si-O-Al-O-Al-Si bonding in the places on the surface of the ball that are not adsorbed by Fe.

[0017] 4. Soaking the surface of the pellets in iron salts can generate more iron-containing phases on the surface of the pellets, such as iron sulfate, iron hydroxide, and iron oxide. These irons have a chelating effect with the iron in the sewage.

[0018] Through the above points, the adsorption and removal rate of arsenic in sewage has been greatly improved, and the solid waste has been consumed, achieving the purpose of treating waste with waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the process flow of the present invention. DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with the embodiments and drawings, but the present invention is not limited in any way. Any changes or substitutions made based on the teachings of the present invention belong to the protection scope of the present invention.

[0021] The gel material prepared by using arsenic-containing solid waste of the present invention is prepared by using arsenic-containing solid waste and waste residue as raw materials through ultrasonic oil bath, iron-containing phase lifting and sintering steps.

[0022] The mass ratio of the arsenic-containing solid waste to the waste residue is (5-30): (70-95).

[0023] The arsenic-containing solid waste is solid waste containing FeAsS and / or FeAs2 from the copper, lead, zinc and tin smelting industries.

[0024] The waste residue is one or more of red mud, metakaolin, slag, gypsum, coconut shell and volcanic ash.

[0025] The method for preparing the gel material using arsenic-containing solid waste of the present invention comprises an ultrasonic oil bath, an iron-containing phase enhancement and a sintering step, specifically comprising:

[0026] A. Ultrasonic oil bath:

[0027] 1) Mixing and stirring the arsenic-containing solid waste and waste residue in a prescribed ratio, and then adding an activator to obtain material a;

[0028] 2) placing material a in an oil bath tank to solidify arsenic into agglomerates under ultrasonic stirring to obtain material b;

[0029] B. Improving the iron-containing phase: immersing material b into an iron-containing solution to improve the iron-containing phase to obtain material c;

[0030] C. Sintering: Sinter material c to obtain the target gel material prepared using arsenic-containing solid waste.

[0031] The activator is an alkaline activator Ca(OH)2; the mass ratio of lime is (5%~10%), and the water-cement ratio is 0.1~0.3.

[0032] The oil described in step A2) is industrial waste oil, diatomaceous earth oil, soybean oil, rapeseed oil or methyl silicone oil.

[0033] The frequency of the ultrasonic stirring described in step A2 is 20-40KHz, and the time is 6-15min.

[0034] The iron-containing solution described in step B is FeCl3, Fe2(SO4)3, Fe2O3, FeCl2, FeSO4 or FeO solution.

[0035] The sintering temperature in step C is 400-600° C., and the sintering time is 30-60 min.

[0036] The application of the gel material prepared by using arsenic-containing solid waste described in the present invention is the application of the gel material prepared by using arsenic-containing solid waste in preparing an arsenic adsorbent in sewage.

[0037] The present invention will be further described below with specific embodiments:

[0038] Example 1

[0039] 1 kg of solid waste containing FeAsS and FeAs2 from the copper, lead, zinc and tin smelting industries, 1 kg of waste red mud and 3 kg of metakaolin are mixed and stirred, and a 5% concentration of alkaline activator Ca(OH)2 is added, and the water-cement ratio is controlled at 0.28 to obtain material a; material a is placed in an industrial waste oil, diatomaceous earth oil, soybean oil, rapeseed oil or methyl silicone oil bath under the action of ultrasonic stirring at a frequency of 20-40 kHz for 6-15 minutes to solidify arsenic into agglomerates to obtain material b; material b is immersed in FeCl3, Fe2(SO4)3, Fe2O3, FeCl2, FeSO4 or FeO solution to enhance the iron-containing phase to obtain material c; material c is sintered at 400-600°C for 30-60 minutes to obtain the target gel material prepared using arsenic-containing solid waste. The gel material prepared in this example was used to conduct an adsorption test on arsenic-containing wastewater. Before adsorption, the As ion concentration in the wastewater was 489.88 mg / L, and after adsorption, the As ion concentration was 4.87 mg / L.

[0040] Example 2

[0041] 2 kg of FeAsS-containing solid waste and 3 kg of slag from the copper, lead, zinc and tin smelting industries were mixed and stirred, and 5% concentration of alkaline activator NaOH was added, and the water-cement ratio was controlled at 0.25 to obtain material a; material a was placed in an industrial waste oil, diatomaceous earth oil, soybean oil, rapeseed oil or methyl silicone oil bath under ultrasonic stirring at a frequency of 20-40 KHz for 6-15 minutes to solidify arsenic to obtain material b; material b was immersed in FeCl3, Fe2 (SO4) 3, Fe2O3, FeCl2, FeSO4 or FeO solution to enhance the iron-containing phase to obtain material c; material c was sintered at 400-600 ° C for 30-60 minutes to obtain the target gel material prepared from arsenic-containing solid waste. The gel material prepared in this embodiment was used to conduct an adsorption test on arsenic-containing wastewater. Before adsorption, the As ion concentration in the wastewater was 546.97 mg / L, and after adsorption, the As ion concentration was 14.58 mg / L.

[0042] Example 3

[0043] 0.5 kg of FeAs2-containing solid waste from copper, lead, zinc and tin smelting industries and 4.5 kg of coconut shells were mixed and stirred, and 5% concentration of alkali activator lime was added, and the water-cement ratio was controlled at 0.18 to obtain material a; material a was placed in an industrial waste oil, diatomaceous earth oil, soybean oil, rapeseed oil or methyl silicone oil bath under ultrasonic stirring at a frequency of 20-40 KHz for 6-15 minutes to solidify arsenic to obtain material b; material b was immersed in FeCl3, Fe2 (SO4) 3, Fe2O3, FeCl2, FeSO4 or FeO solution to enhance the iron-containing phase to obtain material c; material c was sintered at 400-600 ° C for 30-60 minutes to obtain the target gel material prepared using arsenic-containing solid waste. The gel material prepared in this embodiment was used to conduct an adsorption test on arsenic-containing wastewater. Before adsorption, the As ion concentration in the wastewater was 298.33 mg / L, and the As ion concentration after adsorption was 2.87 mg / L.

[0044] Example 4

[0045] 0.8 kg of solid waste containing FeAsS and FeAs2 from the copper, lead, zinc and tin smelting industries and 4.2 kg of volcanic ash are mixed and stirred, and a 4% concentration of alkaline activator Ca(OH)2 is added, and the water-ash ratio is controlled at 0.27 to obtain material a; material a is placed in an industrial waste oil, diatomaceous earth oil, soybean oil, rapeseed oil or methyl silicone oil bath under ultrasonic stirring at a frequency of 20-40 kHz for 6-15 minutes to solidify arsenic into agglomerates to obtain material b; material b is immersed in FeCl3, Fe2(SO4)3, Fe2O3, FeCl2, FeSO4 or FeO solution to enhance the iron-containing phase to obtain material c; material c is sintered at 400-600°C for 30-60 minutes to obtain the target gel material prepared using arsenic-containing solid waste. The gel material prepared in this example was used to conduct an adsorption test on arsenic-containing wastewater. Before adsorption, the As ion concentration in the wastewater was 588.34 mg / L, and after adsorption, the As ion concentration was 17.26 mg / L.

[0046] Example 5

[0047] 1.5 kg of solid waste containing FeAsS and FeAs2 from the copper, lead, zinc and tin smelting industries, 2 kg of metakaolin and 1.5 kg of slag are mixed and stirred, and 5% concentration of alkali activator lime is added, and the water-cement ratio is controlled at 0.25 to obtain material a; material a is placed in an industrial waste oil, diatomaceous earth oil, soybean oil, rapeseed oil or methyl silicone oil bath under ultrasonic stirring at a frequency of 20-40 kHz for 6-15 minutes to solidify arsenic into agglomerates to obtain material b; material b is immersed in FeCl3, Fe2 (SO4) 3, Fe2O3, FeCl2, FeSO4 or FeO solution to enhance the iron-containing phase to obtain material c; material c is sintered at 400-600°C for 30-60 minutes to obtain the target gel material prepared using arsenic-containing solid waste. The gel material prepared in this example was used to conduct an adsorption test on arsenic-containing wastewater. Before adsorption, the As ion concentration in the wastewater was 548.69 mg / L, and after adsorption, the As ion concentration was 13.25 mg / L.

Claims

1. A gel material prepared using arsenic-containing solid waste, characterized in that: The gel material prepared by using arsenic-containing solid waste is prepared by using arsenic-containing solid waste, i.e., solid waste and waste residue containing FeAsS and / or FeAs2 in copper, lead, zinc and tin smelting industries as raw materials through ultrasonic oil bath, iron-containing phase lifting and sintering steps, wherein the waste residue is one or more of red mud, metakaolin, slag, gypsum, coconut shell and volcanic ash; the mass ratio of the arsenic-containing solid waste to the waste residue is (5-40): (60-95); the preparation method of the gel material prepared by using arsenic-containing solid waste includes ultrasonic oil bath, iron-containing phase lifting and sintering steps, and specifically includes: A. Ultrasonic oil bath: 1) Mixing and stirring the arsenic-containing solid waste and waste residue in a prescribed ratio, and then adding an activator to obtain material a; 2) placing material a in an oil bath tank to solidify arsenic into agglomerates under ultrasonic stirring to obtain material b; B. Improving the iron-containing phase: immersing material b into an iron-containing solution to improve the iron-containing phase to obtain material c; C. Sintering: Sinter material c to obtain the target gel material prepared using arsenic-containing solid waste.

2. The gel material prepared using arsenic-containing solid waste according to claim 1, characterized in that: The oil described in step A2) is industrial waste oil, diatomaceous earth oil, soybean oil, rapeseed oil or methyl silicone oil.

3. The gel material prepared using arsenic-containing solid waste according to claim 1, characterized in that: The frequency of the ultrasonic stirring described in step A2 is 20-40KHz, and the time is 6-15min.

4. The gel material prepared using arsenic-containing solid waste according to claim 1, characterized in that: The iron-containing solution described in step B is FeCl3, Fe2(SO4)3, Fe2O3, FeCl2, FeSO4 or FeO solution.

5. The gel material prepared using arsenic-containing solid waste according to claim 1, characterized in that: The sintering temperature in step C is 400-600° C., and the sintering time is 30-60 min.

6. An application of the gel material prepared using arsenic-containing solid waste according to claim 1, characterized in that: The gel material prepared by utilizing arsenic-containing solid waste is used in preparing an arsenic adsorbent in sewage.

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