Industrial solid waste-based composite flocculant and its preparation method and application

Abstract

The present invention provides an industrial solid waste-based composite flocculant, its preparation method, and application. The composite flocculant comprises the following raw materials: quicklime, phosphogypsum, red mud, bentonite, an organic flocculant, and an inorganic flocculant. The high-efficiency composite flocculant has stable chemical properties and can rapidly precipitate lake sediment, thereby efficiently separating muddy water. Compared with existing technologies, the treated sediment produced by the present invention is pollution-free, requires less waste, and has a low production cost. It also enables resource utilization of industrial waste.

Description

Technical Field

[0001] The present invention relates to the technical field of lake sedimentation treatment, and in particular to a high-efficiency composite flocculant mainly composed of industrial solid waste, and a preparation method and application thereof. Background Art

[0002] The high water content of lake sediments means they are bulky, increasing transportation costs and complexity while also requiring extensive disposal sites. Therefore, dewatering is a crucial step in the treatment process, and the dewatering performance of the sediment directly impacts both the effectiveness and cost of dewatering. Therefore, prior to dehydration and drying, it is necessary to add a flocculating dehydration agent to improve the dewatering performance of the sediment.

[0003] However, with the rapid development of science and technology, more and more new pollutants are discharged into rivers and lakes, resulting in an increase in organic matter and toxic and harmful substances in the bottom mud, which increases the difficulty of bottom mud dehydration. A single flocculant can no longer meet the dehydration requirements. In the industrial production process, a lot of waste resources are generated. If a composite flocculant suitable for it is developed, the resource utilization of waste can be realized. The present invention combines industrial solid waste quicklime, phosphogypsum, red mud, bentonite with organic and inorganic flocculants to develop an industrial solid waste-based composite flocculant, which can realize the rapid flocculation and dehydration of lake bottom mud while also realizing the resource utilization of solid waste, saving costs and achieving good environmental benefits. Summary of the Invention

[0004] The purpose of the present invention is to provide an industrial solid waste-based high-efficiency composite flocculant and its preparation method and application, so as to achieve rapid dehydration of lake sediments.

[0005] In order to achieve the above production goals, the specific technical solutions of the present invention are as follows:

[0006] An industrial solid waste-based composite flocculant is mainly prepared from industrial solid waste raw materials, an organic flocculant, and an inorganic flocculant in a ratio of 3g:(1-3)mL:(1-6)mL; the industrial solid waste raw materials include: 5%-10% quicklime, 35%-45% phosphogypsum, 10%-20% red mud, and 30%-40% bentonite.

[0007] The inorganic flocculant includes at least one of polyaluminum chloride, polyaluminum ferric chloride and aluminum chloride, and the concentration range of the prepared flocculant is 2.5%-3.5%.

[0008] The organic flocculant includes cationic polyacrylamide (CPAM) and is prepared in a concentration range of 0.8%-1.2%.

[0009] The industrial solid waste-based composite flocculant is mainly prepared from industrial solid waste raw materials, organic flocculants and inorganic flocculants AlCl3 in a ratio of 3g:2mL:6mL: the industrial solid waste raw materials include: 5% quicklime, 35% phosphogypsum, 20% red mud and 40% bentonite.

[0010] Or it is mainly prepared from industrial solid waste raw materials, organic flocculant and inorganic flocculant PAC in a ratio of 3g:2mL:4mL: the industrial solid waste raw materials include: quicklime 5%, phosphogypsum 45%, red mud 15%, bentonite 35%;

[0011] Alternatively, the raw material is mainly prepared from industrial solid waste, an organic flocculant, and an inorganic flocculant AlCl3 in a ratio of 3g:2mL:6mL: the industrial solid waste raw material includes: quicklime 10%, phosphogypsum 40%, red mud 15%, and bentonite 35%;

[0012] Alternatively, the method is mainly prepared from industrial solid waste raw materials, an organic flocculant, and an inorganic flocculant PAFC in a ratio of 3g:2mL:2mL: the industrial solid waste raw materials include: 10% quicklime, 40% phosphogypsum, 20% red mud, and 30% bentonite.

[0013] Alternatively, the method is mainly prepared from industrial solid waste raw materials, an organic flocculant, and an inorganic flocculant PAC in a ratio of 3g:2mL:4mL: the industrial solid waste raw materials include: 7% quicklime, 45% phosphogypsum, 10% red mud, and 38% bentonite.

[0014] The main component of the quicklime is CaO, the CaO content is more than 95%, and the mesh number of the quicklime is not less than 100 meshes.

[0015] The main component of the phosphogypsum is calcium sulfate, the content of calcium sulfate reaches more than 70%, and the mesh number of the phosphogypsum is not less than 100 meshes.

[0016] The red mud has a mesh size of not less than 200 meshes.

[0017] The bentonite mesh number is 200 meshes.

[0018] The present invention also provides a method for preparing the industrial solid waste-based composite flocculant, comprising the following steps:

[0019] (1) mixing industrial solid wastes, quicklime, phosphogypsum, red mud, and bentonite in proportion;

[0020] (2) adding an organic flocculant solution and an inorganic flocculant solution prepared with pure water as a solvent to the obtained industrial solid waste in proportion, mixing them evenly, and obtaining an industrial solid waste-based composite flocculant.

[0021] The present invention also provides the use of the industrial solid waste-based composite flocculant in sedimentation of lake sediments.

[0022] The application of an industrial solid waste-based high-efficiency composite flocculant comprises the following steps:

[0023] (1) The sediment from Dongting Lake in Yueyang was used as the test object. After salvaging, 600 mL of the mud-water mixture was added to the beaker of a six-in-one mixer, and then the above-mentioned industrial solid waste-based composite flocculant was added at a ratio of 0.5 g / 100 mL.

[0024] (2) The mud-water mixture was stirred at a speed of 200 r / min for 1 min, and then stirred at a speed of 50 r / min for 10 min to carry out the bottom mud flocculation reaction, and then the mud-water mixture was allowed to stand for 30 min.

[0025] (3) Take the supernatant and measure its turbidity using a turbidimeter. The remaining sediment is vacuum filtered at a pressure of 0.1 MPa for 2 minutes. After drying, measure the moisture content of the mud cake and calculate the dehydration rate of the sediment.

[0026] The beneficial effects and technical advantages of the present invention are as follows:

[0027] The first aspect of the present invention provides an industrial solid waste-based composite flocculant, comprising industrial solid wastes such as quicklime, phosphogypsum, red mud, bentonite, organic flocculants, and inorganic flocculants. The present invention utilizes the advantages of the original organic flocculants and inorganic flocculants by adding industrial solid wastes to achieve resource utilization of industrial solid wastes. The organic flocculants and inorganic flocculants can be effective in flocculation, while quicklime can adjust the pH and enhance the flocculation effect of the inorganic flocculants and organic flocculants. The Fe in the red mud can be used as a coagulant to reduce the amount of Fe in the red mud. 2+ It can react in the mixed liquid, greatly promoting the flocculation effect.

[0028] The second aspect of the present application provides a method for preparing an industrial solid waste-based composite flocculant, which has the advantages of simple preparation, short preparation time, wide and easy access to raw materials, no need for complex mechanical equipment in the production process, and low production cost.

[0029] The third aspect of this application provides an industrial solid waste-based composite flocculant used in the dewatering of sediment from Dongting Lake in Yueyang. The supernatant turbidity was below 30, the sediment dehydration rate reached over 93%, and the moisture content of the mud cake was reduced to approximately 40%. The resulting flocculated precipitate can be used to make ecological slope protection bricks, achieving resource utilization of solid waste. This composite flocculant features a simple construction process and easy operation. By adjusting the formulation ratio, it can be used to produce a highly effective dewatering composite flocculant. DETAILED DESCRIPTION

[0030] In order to have a clearer understanding of the technical features, objectives and beneficial effects of the present invention, the technical solutions of the present invention are described in detail below in conjunction with the following specific embodiments, but they should not be construed as limiting the scope of implementation of the present invention.

[0031] The following describes the details in conjunction with specific embodiments.

[0032] Example 1

[0033] Preparation and application of a composite flocculant

[0034] This embodiment provides a preparation and application of an industrial solid waste-based high-efficiency composite flocculant:

[0035] (1) Industrial solid waste phosphogypsum and quicklime were crushed and sieved through a 100-mesh sieve to obtain test sample powder.

[0036] (2) Industrial solid waste red mud and bentonite were crushed and sieved through a 200-mesh sieve to obtain test sample powder.

[0037] (3) Weigh 1 g of organic flocculant CPAM powder and dissolve it in 100 mL of pure water to obtain a 1% CPAM solution.

[0038] (4) Weigh 3 g of AlCl3 powder and dissolve it in 100 mL of pure water until it is fully dissolved to obtain a 3% inorganic flocculant AlCl3 solution.

[0039] (5) The total weight of the industrial solid waste raw materials was 3 g, and the organic flocculant and the inorganic flocculant were prepared according to the proportions in Table 1: 5% quicklime, 35% phosphogypsum, 20% red mud, 40% bentonite, 2 mL organic flocculant, and 6 mL inorganic flocculant AlCl3.

[0040] (6) At room temperature and under stirring, quicklime, phosphogypsum, red mud, and bentonite are mixed in proportion to obtain an industrial solid waste mixture with a total weight of 3 g. The mixture is then thoroughly mixed with 2 mL of a 1% organic flocculant solution and 6 mL of a 3% inorganic flocculant AlCl3 solution to obtain an industrial solid waste-based high-efficiency composite flocculant.

[0041] (7) The bottom mud of Dongting Lake in Yueyang was used as the test object. After salvaging, 600 mL of mud-water mixture was added to the beaker of a six-in-one mixer, and then the above-mentioned industrial solid waste-based composite flocculant was added at a ratio of 0.5 g / 100 mL.

[0042] The mud-water mixture was stirred at a speed of 200 r / min for 1 min, and then stirred at a speed of 50 r / min for 10 min to carry out bottom mud flocculation reaction, and then the mud-water mixture was allowed to stand for more than 30 min.

[0043] The supernatant was collected and its turbidity was measured using a turbidimeter. The remaining sludge was vacuum filtered at a pressure of 0.1 MPa for 2 minutes. After drying, the moisture content of the sludge cake was measured and the dehydration rate of the sludge was calculated. The following examples and comparative examples were all processed and tested according to the sludge treatment and testing methods of Example 1.

[0044] Example 2

[0045] Preparation and application of a composite flocculant

[0046] This embodiment provides a preparation and application of an industrial solid waste-based high-efficiency composite flocculant:

[0047] (1) Industrial solid waste phosphogypsum and quicklime were crushed and sieved through a 100-mesh sieve to obtain test sample powder.

[0048] (2) Industrial solid waste red mud and bentonite were crushed and sieved through a 200-mesh sieve to obtain test sample powder.

[0049] (3) Weigh 1 g of organic flocculant CPAM powder and dissolve it in 100 mL of pure water to obtain a 1% CPAM solution.

[0050] (4) Weigh 3 g of PAC powder and dissolve it in 100 mL of pure water until it is fully dissolved to obtain a 3% inorganic flocculant PAC solution.

[0051] (5) The total weight of the industrial solid waste raw materials (3 g) was mixed with organic flocculants and inorganic flocculants according to the proportions in Table 1: 5% quicklime, 45% phosphogypsum, 15% red mud, 35% bentonite, 2 mL organic flocculant, and 4 mL inorganic flocculant PAC.

[0052] (6) At room temperature and under stirring, quicklime, phosphogypsum, red mud, and bentonite were mixed in proportion to obtain an industrial solid waste mixture with a total weight of 3 g. The mixture was then thoroughly mixed with 2 mL of a 1% organic flocculant solution and 4 mL of a 3% inorganic flocculant PAC solution to obtain an industrial solid waste-based high-efficiency composite flocculant.

[0053] (7) The sediment from Dongting Lake in Yueyang was treated as the treatment object. The industrial solid waste-based composite flocculant prepared in Example 2 was added. After flocculation and sedimentation, the turbidity of the supernatant was measured. The remaining sediment was vacuum filtered at a pressure of 0.1 MPa for 2 minutes. The moisture content of the mud cake was measured and the dehydration rate of the sediment was calculated.

[0054] Example 3

[0055] Preparation and application of a composite flocculant

[0056] This embodiment provides a preparation and application of an industrial solid waste-based high-efficiency composite flocculant:

[0057] (1) Industrial solid waste phosphogypsum and quicklime were crushed and sieved through a 100-mesh sieve to obtain test sample powder.

[0058] (2) Industrial solid waste red mud and bentonite were crushed and sieved through a 200-mesh sieve to obtain test sample powder.

[0059] (3) Weigh 1 g of organic flocculant CPAM powder and dissolve it in 100 mL of pure water to obtain a 1% CPAM solution.

[0060] (4) Weigh 3 g of AlCl3 powder and dissolve it in 100 mL of pure water until it is fully dissolved to obtain a 3% inorganic flocculant AlCl3 solution.

[0061] (5) The total weight of the industrial solid waste raw materials (3 g) was mixed with organic flocculants and inorganic flocculants according to the proportions in Table 1: quicklime 10%, phosphogypsum 40%, red mud 15%, bentonite 35%, 2 mL of organic flocculant, and 6 mL of inorganic flocculant AlCl3.

[0062] (6) At room temperature and under stirring, quicklime, phosphogypsum, red mud, and bentonite are mixed in proportion to obtain a total weight of 3 g of industrial solid waste mixture, which is then thoroughly mixed with 2 mL of a 1% organic flocculant solution and 6 mL of a 3% inorganic flocculant AlCl3 solution to obtain an industrial solid waste-based high-efficiency composite flocculant.

[0063] (7) The sediment from Dongting Lake in Yueyang was treated as the object, and the industrial solid waste-based high-efficiency composite flocculant prepared in Example 3 was added. After flocculation and sedimentation, the turbidity of the supernatant was measured, and the remaining sediment was vacuum filtered at a pressure of 0.1 MPa for 2 minutes. The moisture content of the mud cake was measured, and the dehydration rate of the sediment was calculated.

[0064] Example 4

[0065] Preparation and application of a composite flocculant

[0066] This embodiment provides a preparation and application of an industrial solid waste-based high-efficiency composite flocculant:

[0067] (1) Industrial solid waste phosphogypsum and quicklime were crushed and sieved through a 100-mesh sieve to obtain test sample powder.

[0068] (2) Industrial solid waste red mud and bentonite were crushed and sieved through a 200-mesh sieve to obtain test sample powder.

[0069] (3) Weigh 1 g of organic flocculant CPAM powder and dissolve it in 100 mL of pure water to obtain a 1% CPAM solution.

[0070] (4) Weigh 3 g of PAFC powder and dissolve it in 100 mL of pure water until it is fully dissolved to obtain a 3% inorganic flocculant PAFC solution.

[0071] (5) The total weight of the industrial solid waste raw materials (3 g) was mixed with organic flocculants and inorganic flocculants according to the proportions in Table 1: quicklime 10%, phosphogypsum 40%, red mud 20%, bentonite 30%, 2 mL of organic flocculant, and 6 mL of inorganic flocculant PAFC.

[0072] (6) At room temperature and under stirring, quicklime, phosphogypsum, red mud, and bentonite were mixed in proportion to obtain an industrial solid waste mixture with a total weight of 3 g. The mixture was then thoroughly mixed with 2 mL of a 1% organic flocculant solution and 6 mL of a 1% inorganic flocculant PAFC solution to obtain an industrial solid waste-based high-efficiency composite flocculant.

[0073] (7) The sediment from Dongting Lake in Yueyang was treated as the object, and the industrial solid waste-based high-efficiency composite flocculant prepared in Example 4 was added. After flocculation and sedimentation, the turbidity of the supernatant was measured, and the remaining sediment was vacuum filtered at a pressure of 0.1 MPa for 2 minutes. The moisture content of the mud cake was measured, and the dehydration rate of the sediment was calculated.

[0074] Example 5

[0075] Preparation and application of a composite flocculant

[0076] This embodiment provides a preparation and application of an industrial solid waste-based high-efficiency composite flocculant:

[0077] (1) Industrial solid waste phosphogypsum and quicklime were crushed and sieved through a 100-mesh sieve to obtain test sample powder.

[0078] (2) Industrial solid waste red mud and bentonite were crushed and sieved through a 200-mesh sieve to obtain test sample powder.

[0079] (3) Weigh 1 g of organic flocculant CPAM powder and dissolve it in 100 mL of pure water to obtain a 1% CPAM solution.

[0080] (4) Weigh 3 g of PAC powder and dissolve it in 100 mL of pure water until it is fully dissolved to obtain a 3% inorganic flocculant PAC solution.

[0081] (5) The total weight of the industrial solid waste raw materials (3 g) was mixed with organic flocculants and inorganic flocculants according to the proportions in Table 1: quicklime 7%, phosphogypsum 45%, red mud 10%, bentonite 38%, 2 mL of organic flocculant, and 4 mL of inorganic flocculant PAC.

[0082] (6) At room temperature and under stirring, quicklime, phosphogypsum, red mud, and bentonite are mixed in proportion to obtain an industrial solid waste mixture with a total weight of 3 g. The obtained industrial solid waste is thoroughly mixed with 2 mL of a 1% organic flocculant solution and 4 mL of a 1% inorganic flocculant PAC solution to obtain an industrial solid waste-based high-efficiency composite flocculant.

[0083] (7) The sediment from Dongting Lake in Yueyang was treated, and the industrial solid waste-based high-efficiency composite flocculant prepared in Example 5 was added. After flocculation and sedimentation, the turbidity of the supernatant was measured, and the remaining sediment was vacuum filtered at a pressure of 0.1 MPa for 2 minutes. The moisture content of the mud cake was measured, and the dehydration rate of the sediment was calculated.

[0084] Table 1 Flocculant ratios in different embodiments

[0085]

[0086]

[0087] In order to verify the high efficiency of the present invention, the present invention is further illustrated in combination with comparative examples:

[0088] Comparative Example 1

[0089] Preparation and application of a composite flocculant

[0090] This comparative example provides a preparation and application of an industrial solid waste-based flocculant:

[0091] (1) Industrial solid waste phosphogypsum and quicklime were crushed and sieved through a 100-mesh sieve to obtain test sample powder.

[0092] (2) Industrial solid waste red mud and bentonite were crushed and sieved through a 200-mesh sieve to obtain test sample powder.

[0093] (3) The total weight of the industrial solid waste raw materials was 3 g, and the following proportions were used to prepare the product: quicklime 15%, phosphogypsum 40%, red mud 20%, and bentonite 25%.

[0094] (4) At room temperature and under stirring, quicklime, phosphogypsum, red mud, and bentonite are mixed in proportion to obtain an industrial solid waste flocculant with a total weight of 3 g.

[0095] (5) The bottom mud of Dongting Lake in Yueyang was used as the treatment object, and the composite flocculant prepared in Comparative Example 1 was added. After flocculation and sedimentation, the turbidity of the supernatant was measured, and the remaining bottom mud was vacuum filtered at a pressure of 0.1 MPa for 2 minutes. The moisture content of the mud cake was measured, and the dehydration rate of the bottom mud was calculated.

[0096] Comparative Example 2

[0097] Preparation and application of an organic flocculant

[0098] This comparative example provides the preparation and application of an organic flocculant:

[0099] (1) Weigh 1 g of organic flocculant CPAM powder and dissolve it in 100 mL of pure water to obtain a 1% CPAM solution.

[0100] (2) Take 2 mL of organic flocculant according to the mixing ratio in Table 2.

[0101] (3) The sediment of Dongting Lake in Yueyang was treated, and the flocculant prepared in Comparative Example 2 was added. After flocculation and sedimentation, the turbidity of the supernatant was measured, and the remaining sediment was vacuum filtered at a pressure of 0.1 MPa for 2 minutes. The moisture content of the mud cake was measured, and the dehydration rate of the sediment was calculated.

[0102] Comparative Example 3

[0103] Preparation and application of an inorganic flocculant

[0104] This comparative example provides a preparation and application of an inorganic flocculant:

[0105] (1) Weigh 3 g of AlCl3 powder and dissolve it in 100 mL of pure water until it is fully dissolved to obtain a 3% inorganic flocculant AlCl3 solution.

[0106] (2) Take 6 mL of inorganic flocculant according to the mixing ratio in Table 2.

[0107] (3) The sediment of Dongting Lake in Yueyang was treated, and the flocculant prepared in Comparative Example 3 was added. After flocculation and sedimentation, the turbidity of the supernatant was measured, and the remaining sediment was vacuum filtered at a pressure of 0.1 MPa for 2 minutes. The moisture content of the mud cake was measured, and the dehydration rate of the sediment was calculated.

[0108] Comparative Example 4

[0109] Preparation and application of a composite flocculant

[0110] This comparative example provides a preparation and application of an industrial solid waste-based high-efficiency composite flocculant:

[0111] (1) Industrial solid waste phosphogypsum and quicklime were crushed and sieved through a 100-mesh sieve to obtain test sample powder.

[0112] (2) Industrial solid waste red mud and bentonite were crushed and sieved through a 200-mesh sieve to obtain test sample powder.

[0113] (3) Weigh 1 g of organic flocculant CPAM powder and dissolve it in 100 mL of pure water to obtain a 1% CPAM solution.

[0114] (4) The total weight of the industrial solid waste raw materials (3 g) was mixed with an organic flocculant according to the proportions in Table 2: quicklime 10%, phosphogypsum 40%, red mud 20%, bentonite 30%, and 2 mL of organic flocculant.

[0115] (5) At room temperature and under stirring, quicklime, phosphogypsum, red mud, and bentonite are mixed in proportion to obtain a total weight of 3 g of an industrial solid waste mixture, which is then thoroughly mixed with 2 mL of a 1% organic flocculant solution to obtain an industrial solid waste-based high-efficiency composite flocculant.

[0116] (6) The sediment of Dongting Lake in Yueyang was treated as the object, and the industrial solid waste-based high-efficiency composite flocculant prepared in Comparative Example 4 was added. After flocculation and sedimentation, the turbidity of the supernatant was measured, and the remaining sediment was vacuum filtered at a pressure of 0.1 MPa for 2 minutes. The moisture content of the mud cake was measured, and the dehydration rate of the sediment was calculated.

[0117] Comparative Example 5

[0118] Preparation and application of a composite flocculant

[0119] This comparative example provides a preparation and application of an industrial solid waste-based high-efficiency composite flocculant:

[0120] (1) Industrial solid waste phosphogypsum and quicklime were crushed and sieved through a 100-mesh sieve to obtain test sample powder.

[0121] (2) Industrial solid waste red mud and bentonite were crushed and sieved through a 200-mesh sieve to obtain test sample powder.

[0122] (3) Weigh 3 g of PAFC powder and dissolve it in 100 mL of pure water until it is fully dissolved to obtain a 3% inorganic flocculant PAFC solution.

[0123] (4) The total weight of the industrial solid waste raw materials (3 g) was mixed with organic flocculants and inorganic flocculants according to the proportions in Table 1: quicklime 10%, phosphogypsum 40%, red mud 20%, bentonite 30%, and 6 mL of inorganic flocculant PAFC.

[0124] (5) At room temperature and under stirring, quicklime, phosphogypsum, red mud, and bentonite were mixed in proportion to obtain a total weight of 3 g of industrial solid waste mixture, which was then thoroughly mixed with 6 mL of a 1% inorganic flocculant PAFC solution to obtain an industrial solid waste-based high-efficiency composite flocculant.

[0125] (6) The bottom mud of Dongting Lake in Yueyang was used as the treatment object, and the industrial solid waste-based high-efficiency composite flocculant prepared in Comparative Example 5 was added. After flocculation and sedimentation, the turbidity of the supernatant was measured, and the remaining bottom mud was vacuum filtered at a pressure of 0.1 MPa for 2 minutes. The moisture content of the mud cake was measured, and the dehydration rate of the bottom mud was calculated.

[0126] Comparative Example 6

[0127] Preparation and application of a composite flocculant

[0128] This embodiment provides a preparation and application of an industrial solid waste-based high-efficiency composite flocculant:

[0129] (1) Industrial solid waste phosphogypsum and quicklime were crushed and sieved through a 100-mesh sieve to obtain test sample powder.

[0130] (2) Industrial solid waste red mud and bentonite were crushed and sieved through a 200-mesh sieve to obtain test sample powder.

[0131] (3) Weigh 1 g of organic flocculant CPAM powder and dissolve it in 100 mL of pure water to obtain a 1% CPAM solution.

[0132] (4) Weigh 3 g of PAC powder and dissolve it in 100 mL of pure water until it is fully dissolved to obtain a 3% inorganic flocculant PAFC solution.

[0133] (5) The total weight of the industrial solid waste raw materials (3 g) was mixed with organic flocculants and inorganic flocculants according to the proportions in Table 1: quicklime 10%, phosphogypsum 40%, red mud 20%, bentonite 30%, 2 mL of organic flocculant, and 8 mL of inorganic flocculant PAFC.

[0134] (6) At room temperature and under stirring, quicklime, phosphogypsum, red mud, and bentonite were mixed in proportion to obtain an industrial solid waste mixture with a total weight of 3 g. The mixture was then thoroughly mixed with 2 mL of a 1% organic flocculant solution and 8 mL of a 1% inorganic flocculant PAFC solution to obtain an industrial solid waste-based high-efficiency composite flocculant.

[0135] (7) The bottom mud of Dongting Lake in Yueyang was used as the treatment object, and the industrial solid waste-based high-efficiency composite flocculant prepared in Comparative Example 6 was added. After flocculation and sedimentation, the turbidity of the supernatant was measured, and the remaining bottom mud was vacuum filtered at a pressure of 0.1 MPa for 2 minutes. The moisture content of the mud cake was measured, and the dehydration rate of the bottom mud was calculated.

[0136] Table 2 Flocculant ratios in different comparative examples

[0137]

[0138] Flocculants prepared according to the preparation methods described in Examples 1-5 and Comparative Examples 1-6 were applied to the flocculation and sedimentation of Dongting Lake sediment, and the dehydration effects of the composite flocculants were investigated. The results are shown in Table 3. As can be seen from Table 3, when the reagent ratios of the five examples were 5%-10% quicklime, 35%-45% phosphogypsum, 10%-20% red mud, 30%-40% bentonite, 1% organic flocculant (2 ml), and 3% inorganic flocculant (1 mL-6 mL), the turbidity of the resulting mud water supernatant was all below 30, the mud cake moisture content was around 40%, and the final mud dehydration rate was as high as 94%. In contrast, in the six comparative examples, the turbidity of the resulting mud water supernatant was all greater than 60, the mud cake moisture content was 48.85% or higher, and the final mud dehydration rate was also relatively low. In summary, when the ratio of the industrial solid waste-based high-efficiency flocculant reagent produced by the present invention is within the test range, the test results obtained meet the expected results of this test. Compared with the comparative example, on the basis of the original flocculant effect, it achieves higher efficiency, and the whole process is simple to operate and low in economic cost.

[0139] Table 3 Dehydration effects of different embodiments and comparative examples

[0140]

[0141]

[0142] The above description is merely a preferred embodiment of the present invention and does not constitute any other form of limitation to the present invention. Any person skilled in the art may utilize the technical contents disclosed above to change or modify them into equivalent embodiments with equivalent changes for application in other fields. However, any simple modification, equivalent change, and modification of the above embodiments made in accordance with the technical essence of the present invention without departing from the technical solution of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. An industrial solid waste-based composite flocculant, characterized in that: The method is prepared by mixing industrial solid waste raw materials with organic flocculants and inorganic flocculants in a ratio of 3g: (1-3)mL: (1-6)mL; the industrial solid waste raw materials are: quicklime 5%-10%, phosphogypsum 35%-45%, red mud 10%-20% and bentonite 30%-40%; The method for preparing the industrial solid waste-based composite flocculant comprises the following steps: (1) Mix the industrial solid wastes of quicklime, phosphogypsum, red mud and bentonite in proportion; (2) adding an organic flocculant solution and an inorganic flocculant solution prepared with pure water as a solvent to the obtained industrial solid waste in proportion, mixing them evenly, and obtaining an industrial solid waste-based composite flocculant; The inorganic flocculant is at least one of polyaluminium chloride, polyaluminium ferric chloride and aluminium chloride, and the concentration thereof is 2.5%-3.5%; The organic flocculant is cationic polyacrylamide, and the prepared concentration is 0.8%-1.2%.

2. The industrial solid waste-based composite flocculant according to claim 1, characterized in that: It is prepared from industrial solid waste raw materials, organic flocculant and inorganic flocculant AlCl3 in the ratio of 3g:2mL:6mL; the industrial solid waste raw materials are: 5% quicklime, 35% phosphogypsum, 20% red mud and 40% bentonite; Alternatively, the mixture is prepared from industrial solid waste raw materials, organic flocculant, and inorganic flocculant PAC in a ratio of 3g:2mL:4mL; the industrial solid waste raw materials are: 5% quicklime, 45% phosphogypsum, 15% red mud, and 35% bentonite; Alternatively, the mixture is prepared from industrial solid waste raw materials, an organic flocculant, and an inorganic flocculant AlCl3 in a ratio of 3g:2mL:6mL; the industrial solid waste raw materials are: quicklime 10%, phosphogypsum 40%, red mud 15%, and bentonite 35%; Alternatively, the mixture is prepared from industrial solid waste raw materials, an organic flocculant, and an inorganic flocculant PAFC in a ratio of 3 g: 2 mL: 2 mL; the industrial solid waste raw materials are: quicklime 10%, phosphogypsum 40%, red mud 20%, and bentonite 30%; Alternatively, it is prepared from industrial solid waste raw materials, organic flocculant and inorganic flocculant PAC in a ratio of 3g:2mL:4mL; the industrial solid waste raw materials are: quicklime 7%, phosphogypsum 45%, red mud 10% and bentonite 38%.

3. The industrial solid waste-based composite flocculant according to claim 1, characterized in that: The main component of the quicklime is CaO, the CaO content is more than 95%, and the mesh number of the quicklime is not less than 100 meshes.

4. The industrial solid waste-based composite flocculant according to claim 1, characterized in that: The main component of the phosphogypsum is calcium sulfate, the calcium sulfate content is more than 70%, and the mesh size of the phosphogypsum is not less than 100 meshes.

5. The industrial solid waste-based composite flocculant according to claim 1, characterized in that: The red mud has a mesh size of not less than 200 meshes.

6. The industrial solid waste-based composite flocculant according to claim 1, characterized in that: The bentonite mesh number is 200 meshes.

7. The method for preparing an industrial solid waste-based composite flocculant according to any one of claims 1 to 6, characterized in that: The following steps are involved: (1) Mix the industrial solid wastes of quicklime, phosphogypsum, red mud and bentonite in proportion; (2) Adding an organic flocculant solution and an inorganic flocculant solution prepared with pure water as a solvent to the obtained industrial solid waste in proportion, mixing them evenly, and obtaining an industrial solid waste-based composite flocculant.

8. Use of the industrial solid waste-based composite flocculant according to any one of claims 1 to 6 in sedimentation of lake sediments.

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