Heavy metal ion sulfide trapping agent as well as preparation method and use method thereof

Abstract

The invention belongs to the technical field of heavy metal ion recovery, and particularly relates to a heavy metal ion sulfide trapping agent as well as a preparation method and a use method thereof. 30 to 50 parts of coal; 2 to 10 parts of sand; 10 to 30 parts of a biodegradable macromolecular material; wherein functional groups contained in the biodegradable macromolecular material comprise amino groups and carboxyl groups; according to the heavy metal ion sulfide trapping agent as well as the preparation method and the use method thereof, effective secondary utilization of waste resources can be realized, and the preparation cost is low; meanwhile, the trapping agent is easy to prepare, only simple blending compression molding is needed, and large-scale application and popularization are facilitated; besides, the trapping agent not only can be applied to remediation of the soil environment polluted by the heavy metal ions, but also can be applied to the water environment polluted by the heavy metal ions, and is wide in application range.

Description

Technical Field

[0001] The invention belongs to the technical field of heavy metal ion recovery, and specifically relates to a heavy metal ion sulfide trapping agent and a preparation method and a use method thereof. Background Art

[0002] With the development of industry and the modernization of agricultural production, heavy metal ion pollution in soil and water is becoming increasingly serious, which not only leads to environmental pollution, reduced crop yields and deterioration in quality, but also endangers human health and life safety. Therefore, the effective capture of heavy metal ions in soil and water environments is imminent.

[0003] Waste sulfur is the waste after desulfurization treatment, which contains a large amount of sulfur. If it is directly discarded, it will cause problems such as waste of resources and environmental pollution. Using waste sulfur as a collector of heavy metal ions can effectively reuse waste sulfur.

[0004] Up to now, there are few studies on using waste sulfur as a heavy metal ion scavenger, and most studies mainly use sulfur as a heavy metal ion scavenger. Patent CN101628750 B discloses a sulfide heavy metal scavenger that can be used for industrial wastewater treatment. It is mainly prepared by reacting sodium sulfide with sulfur to generate sodium polysulfide as a scavenger, and adding aluminum salts such as aluminum sulfate and aluminum chloride as stabilizers. Patent CN110016348 A discloses a soil remediation agent for heavy metal element contaminated soil and its preparation method. The soil remediation agent includes calcium silicate, lime, calcium phosphate, sulfur, organic fertilizer and modified acrylic fiber. The soil remediation agent can fix heavy metal ions in the soil, reduce the content and activity of heavy metal ions in the soil, prevent crops from absorbing them, and achieve the purpose of heavy metal ion pollution control in the soil.

[0005] However, the above process is not only responsible for the production process, but also cannot solve the heavy metal ion pollution problems in water and soil at the same time. Therefore, providing a sulfide collector that can overcome the incompatibility defects of water and soil environments is a technical problem that urgently needs to be solved in this field.

[0006] It should be noted that the above information disclosed in this background technology section is only used to understand the background technology of the present application concept, and therefore, the above description is not considered to constitute information of the prior art. Summary of the invention

[0007] The embodiments of the present disclosure at least provide a heavy metal ion sulfide trapping agent and a preparation method and a use method thereof.

[0008] In a first aspect, an embodiment of the present disclosure provides a heavy metal ion sulfide collector, comprising the following components in parts by weight: 2-10 parts of waste sulfur; 30-50 parts of coal; 2-10 parts of sand; 10-30 parts of biodegradable macromolecular materials; wherein the functional groups contained in the biodegradable macromolecular materials include amino groups and carboxyl groups.

[0009] In an optional embodiment, the coal includes any one or more combinations of lignite, fat coal and coking coal.

[0010] In an optional embodiment, the biodegradable macromolecular material includes any one or more combinations of chitosan, starch, sodium alginate, gelatin and cellulose.

[0011] In a second aspect, the embodiments of the present disclosure also provide a method for preparing a heavy metal ion sulfide collector as described above, comprising the following steps: step S1, weighing waste sulfur, coal and biodegradable macromolecular materials in proportion, and grinding them into mixed small particles; step S2, mixing the mixed small particles with sand evenly, and pressing them into a finished product.

[0012] In an optional embodiment, the particle size of the small particles is 100 μm-1 mm.

[0013] In an optional embodiment, a mixer is used for stirring and mixing in step S2, the rotation speed of the mixer is 500-2000 r / min, and the mixing time is 15-30 min.

[0014] In an optional embodiment, in step S2, a roller forming machine is used for pressing, and the molding temperature is 60-160°C.

[0015] In a third aspect, the embodiments of the present disclosure also provide a method for using the heavy metal ion sulfide scavenger as described above, comprising: adding the heavy metal ion sulfide scavenger to the industrial wastewater to be treated, and the soaking time is not less than 30 minutes.

[0016] In a fourth aspect, the embodiments of the present disclosure also provide a method for using the heavy metal ion sulfide scavenger as described above, comprising: crushing the heavy metal ion sulfide scavenger into powder and evenly sprinkling it on the contaminated soil to be treated, evenly tilling and adding water to the soil, covering it with a plastic film and letting it stand for 1-5 days.

[0017] In an optional embodiment, the moisture content of the soil after adding water is not less than 30%.

[0018] The beneficial effects of the present invention are that the heavy metal ion sulfide scavenger and its preparation method and use method can not only realize the effective secondary utilization of waste resources, but also have low preparation cost; at the same time, the scavenger is simple to prepare, and only requires simple blending and pressing molding, which is convenient for large-scale promotion and application; in addition, the scavenger can be used not only for the restoration of soil environment contaminated by heavy metal ions, but also for water environment contaminated by heavy metal ions, and has a wide range of applications.

[0019] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description.

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below for detailed description as follows. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are 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.

[0022] As used herein, the phrases "in one embodiment," "according to one embodiment," "in some embodiments," and the like generally refer to the fact that the particular feature, structure, or characteristic following the phrase may be included in at least one embodiment of the present disclosure. Therefore, a particular feature, structure, or characteristic may be included in more than one embodiment of the present disclosure, so that these phrases do not necessarily refer to the same embodiment. As used herein, the terms "example," "exemplary," and the like are used to "serve as an example, instance, or illustration." Any implementation, aspect, or design described herein as "example" or "exemplary" is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. On the contrary, the use of the terms "example," "exemplary," and the like is intended to present concepts in a concrete manner.

[0023] In this document, as used herein, expressions such as "at least one of..." when following a list of elements modify the entire list of elements rather than modifying the individual elements in the list. For example, the expression "at least one of a, b, and c" should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0024] The terms used herein are only used to describe specific exemplary configurations and are not intended to be limited. As used herein, the singular articles "one", "an" and "the" may also be intended to include plural forms, unless it is clearly indicated above that this is not the case. The terms "comprise", "include" and "have" are inclusive, and therefore specify the presence of features, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components and / or combinations thereof. The method steps, processes and operations described herein should not be interpreted as necessarily requiring them to be performed in the specific order discussed or shown, unless specifically identified as an execution order. Additional or alternative steps may be adopted.

[0025] Some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0026] The disclosed embodiment provides a heavy metal ion sulfide collector, comprising the following components in parts by weight: 2-10 parts of waste sulfur; 30-50 parts of coal; 2-10 parts of sand; and 10-30 parts of biodegradable macromolecular materials; wherein the functional groups contained in the biodegradable macromolecular materials include amino groups and carboxyl groups.

[0027] Specifically, the amino group (-NH2) can be protonated to -NH 3+ , providing lone pair electrons to form coordination bonds with metal ions; the carboxyl group (-COOH) is deprotonated to -COO- under physiological pH conditions, providing strong coordination ability.

[0028] Specifically, in the case of having both amino and carboxyl groups, the carboxyl group will preferentially bind to heavy metal ions by utilizing the higher electronegativity of oxygen atoms, and form a chelate after the subsequent addition of the amino group, providing a more effective metal ion removal effect.

[0029] In some embodiments, specifically, the coal includes any one or more combinations of lignite, fat coal and coking coal.

[0030] In some embodiments, specifically, the biodegradable macromolecular material includes any one or more combinations of chitosan, starch, sodium alginate, gelatin and cellulose.

[0031] The disclosed embodiment also provides a method for preparing the heavy metal ion sulfide scavenger as described above, comprising the following steps: step S1, weighing waste sulfur, coal and biodegradable macromolecular materials in proportion, and grinding them into mixed small particles; step S2, mixing the mixed small particles with sand evenly, and pressing them into a finished product.

[0032] In some embodiments, specifically, the particle size of the small particles is 100 μm-1 mm.

[0033] In some embodiments, specifically, in step S2, a mixer is used for stirring and mixing, the rotation speed of the mixer is 500-2000 r / min, and the mixing time is 15-30 min.

[0034] In some embodiments, specifically, in step S2, a roller forming machine is used for pressing, and the molding temperature is 60-160°C.

[0035] The disclosed embodiment also provides a method for using the heavy metal ion sulfide scavenger as described above, comprising: adding the heavy metal ion sulfide scavenger to the industrial wastewater to be treated, and the soaking time is not less than 30 minutes.

[0036] The disclosed embodiment also provides a method for using the heavy metal ion sulfide scavenger as described above, comprising: crushing the heavy metal ion sulfide scavenger into powder and evenly sprinkling it on the contaminated soil to be treated, evenly tilling and adding water to the soil until the moisture content is not less than 30%, covering with a plastic film and letting it stand for 1-5 days.

[0037] Embodiment 1:

[0038] Weigh 10 parts of waste sulfur, 50 parts of lignite, 10 parts of sand, and 30 parts of gelatin respectively, grind the waste sulfur, coal and gelatin into particles with a particle size of 0.5 mm, then put them into a mixer, stir them at a speed of 1000r / min for 15 minutes, take out the mixed material, and put it into a double-roll ball press at a pressure of 10MPa and a temperature of 100℃ for pressing and molding.

[0039] Embodiment 2:

[0040] Weigh 8 parts of waste sulfur, 48 parts of fat coal, 10 parts of sand and 25 parts of carboxymethyl cellulose respectively, grind the waste sulfur, coal and carboxymethyl cellulose into particles with a particle size of 0.1 mm, then put them into a mixer, stir them at a speed of 1500r / min for 20 minutes, take out the mixed material, and put it into a double-roll ball press at a pressure of 15MPa and a temperature of 120°C for compression molding.

[0041] Embodiment 3:

[0042] Weigh 10 parts of waste sulfur, 50 parts of lignite, 10 parts of sand and 30 parts of starch respectively, grind the waste sulfur, coal and starch into particles with a particle size of 0.1 mm, then put them into a mixer, stir them at a speed of 1000 r / min for 30 minutes, take out the mixed material, and put it into a double-roll ball press at a pressure of 10 MPa and a temperature of 80°C for pressing and molding.

[0043] Embodiment 4:

[0044] Weigh 10 parts of waste sulfur, 40 parts of coking coal, 10 parts of sand, and 30 parts of sodium alginate respectively, grind the waste sulfur, coal and sodium alginate into particles with a particle size of 0.3 mm, then put them into a mixer, stir them at a speed of 500 r / min for 15 minutes, take out the mixed material, and put it into a double-roll ball press at a pressure of 10 MPa and a temperature of 150°C for pressing and molding.

[0045] Effect example 1:

[0046] (1) Experimental sample: the heavy metal ion capture agent prepared in Examples 1 to 4 of the present invention.

[0047] (2) Experimental method: The industrial wastewater from a company in Wuxi was selected as the test object. The contents of copper ions, zinc ions and nickel ions in the wastewater were all 100 mg / L.

[0048] Take 4 parts of industrial wastewater with a volume of 1L respectively, add 1kg of the heavy metal ion scavenger prepared in Example 1 to Example 4, soak for 1h, and measure the contents of copper ions, zinc ions and nickel ions in the 4 parts of industrial wastewater respectively. The measurement results are shown in Table 1.

[0049] Table 1. Changes in heavy metal ion content in water before and after treatment

[0050]

[0051] Effect Example 2:

[0052] (1) Experimental sample: the heavy metal ion capture agent prepared in Examples 1 to 4 of the present invention.

[0053] (2) Experimental method: Heavy metal contaminated soil from a farmland in Changzhou City was selected. The cadmium ion, lead ion and arsenic ion content in the soil was 100 mg / L.

[0054] Take 4 parts of heavy metal contaminated soil with a weight of 50 kg respectively, add 5 kg of the heavy metal ion capture agent prepared in Example 1 to Example 4, and crush the heavy metal ion capture agent into powder and evenly sprinkle it on the heavy metal contaminated soil, stir evenly for 30 minutes, and add water to the mixed soil to make the soil moisture content reach more than 40%, and finally cover with plastic film for maintenance for 3 days. After 3 days, the contents of cadmium ions, lead ions, and arsenic ions in the 4 parts of soil were measured respectively. The measurement results are shown in Table 2.

[0055]

[0056] Table 2. Changes in heavy metal ion content in soil before and after treatment

[0057] Specifically, it can be seen from Table 1 and Table 2 that the heavy metal ion scavenger provided by the present invention has excellent heavy metal ion scavenging effect in both water and soil, and achieves effective treatment of different heavy metal polluted environments.

[0058] In summary, the heavy metal ion sulfide scavenger and its preparation method and use method can not only realize the effective secondary utilization of waste resources, but also have low preparation cost; at the same time, the scavenger is simple to prepare, and only requires simple blending and pressing molding, which is convenient for large-scale promotion and application; in addition, the scavenger can be used not only for the remediation of soil environment contaminated by heavy metal ions, but also for water environment contaminated by heavy metal ions, and has a wide range of applications.

[0059] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A heavy metal ion sulfide scavenger, characterized in that: The composition includes the following components in parts by weight: 2-10 parts of waste sulfur; 30-50 parts of coal; 2-10 parts of sand; 10-30 parts of biodegradable macromolecular materials; The functional groups contained in the biodegradable macromolecular material include amino groups and carboxyl groups.

2. The heavy metal ion sulfide scavenger according to claim 1, characterized in that: The coal includes any one or more combinations of lignite, fat coal and coking coal.

3. The heavy metal ion sulfide scavenger according to claim 1, characterized in that: The biodegradable macromolecular material includes any one or more combinations of chitosan, starch, sodium alginate, gelatin and cellulose.

4. A method for preparing the heavy metal ion sulfide scavenger according to any one of claims 1 to 3, characterized in that: The steps include: Step S1, weighing waste sulfur, coal and biodegradable macromolecular materials respectively in proportion, and grinding them into mixed small particles; Step S2, mixing the mixed small particles with sand evenly, and pressing and molding to obtain a finished product.

5. The preparation method according to claim 4, characterized in that: The particle size of the small particles is 100 μm-1 mm.

6. The preparation method according to claim 4, characterized in that: In step S2, a mixer is used for stirring and mixing, the rotation speed of the mixer is 500-2000 r / min, and the mixing time is 15-30 min.

7. The preparation method according to claim 4, characterized in that: In the step S2, a roller forming machine is used for pressing, and the forming temperature is 60-160°C.

8. A method for using the heavy metal ion sulfide scavenger according to any one of claims 1 to 3, characterized in that: include: The heavy metal ion sulfide scavenger is added to the industrial wastewater to be treated, and the soaking time is not less than 30 minutes.

9. A method for using the heavy metal ion sulfide scavenger according to any one of claims 1 to 3, characterized in that: include: The heavy metal ion sulfide scavenger is crushed into powder and evenly sprinkled on the contaminated soil to be treated, the soil is evenly ploughed and water is added to the soil, and the soil is covered with a plastic film and left to stand for 1-5 days.

10. The method of use according to claim 9, characterized in that: The moisture content of the soil after adding water is not less than 30%.

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