A thallium removal agent for mineral processing wastewater

Abstract

The invention discloses a thallium removal agent for mineral processing wastewater, the thallium removal agent comprises sodium hydrosulfide, sodium hydroxide, nano-modified particles and a solvent; wherein the mass ratio of the sodium hydrosulfide, sodium hydroxide, nano-modified particles and the solvent is (2-5):1:(2-3):11. The invention can efficiently remove thallium ions in water, and the treated water quality meets environmental protection standards; the method of use is simple, no complex equipment support is required, and the invention is suitable for water treatment occasions of various scales; the invention is environmentally friendly, safe and free of secondary pollution, and the nano-modified particles and the solvent are coordinated with each other to optimize the thallium removal efficiency of the product, and the thallium removal efficiency of the product is remarkable under low temperature environment.

Description

Technical Field

[0001] The invention relates to the technical field of mineral processing, and in particular to a thallium removal agent for mineral processing wastewater. Background Art

[0002] Thallium is a toxic heavy metal whose compounds may be discharged into the environment during industrial activities, causing soil and water pollution. Thallium poisoning is extremely dangerous to human health and can cause serious damage to the nervous system, kidneys and digestive system. Existing thallium removal agents have poor thallium removal efficiency and are unstable, which affects the efficiency of thallium removal in low temperature environments. Therefore, the development of an effective thallium removal agent is crucial for environmental protection and public health. Summary of the invention

[0003] In view of the defects of the prior art, the object of the present invention is to provide a reagent for removing thallium from mineral processing wastewater to solve the problems raised in the above background technology.

[0004] The present invention solves the technical problem by adopting the following technical solution:

[0005] The invention provides a thallium removal agent for mineral processing wastewater, which comprises sodium hydrosulfide, sodium hydroxide, nano-modified particles and a solvent; wherein the mass ratio of the sodium hydrosulfide, sodium hydroxide, nano-modified particles and the solvent is (2-5):1:(2-3):11.

[0006] Preferably, the preparation method of the nano-modified particles is:

[0007] S01: heat-treat the nano-bentonite at 320-330°C for 10-20 min, then cool to 55°C at a rate of 2-5°C / min, and keep warm;

[0008] S02: mixing the heat-insulated nano-bentonite with a sodium dodecylbenzene sulfonate solution in an amount of 2-5 times the total amount of the heat-insulated nano-bentonite to obtain a nano-bentonite solution;

[0009] S03: 2-5 parts of yttrium nitrate solution, 1-3 parts of nano silica sol, 1-2 parts of silane coupling agent KH560, and 2-5 parts of hydroxyapatite are mixed to obtain a modified solution;

[0010] S04: The nano-bentonite liquid and the modified liquid are mixed and ball-milled in a weight ratio of 4:3. After the ball-milling is completed, the mixture is washed with water and dried to obtain nano-modified particles.

[0011] Preferably, the mass fraction of the sodium dodecylbenzenesulfonate solution is 2-5%; the mass fraction of the yttrium nitrate solution is 2-4%.

[0012] Preferably, the mixed ball milling treatment is carried out at a ball milling speed of 1000-1500 r / min and the ball milling is carried out for 2 hours.

[0013] Preferably, the solvent is prepared by:

[0014] The nano-silicon dioxide is subjected to proton irradiation treatment at a power of 350-400W for 10-20 minutes, and the nano-silicon dioxide agent is obtained after the irradiation is completed;

[0015] 1-3 parts of nano-silica and 2-5 parts of silane coupling agent KH550 are added to 3-5 parts of chitosan solution and mixed to obtain a solvent.

[0016] Preferably, the mass fraction of the chitosan solution is 4-7%.

[0017] Preferably, the preparation method of the thallium removal agent is:

[0018] Slowly add sodium hydroxide to adjust to the desired pH value;

[0019] Under stirring conditions, sodium hydrosulfide, nano-modified particles and solvent are continuously stirred until they are fully mixed, and then cooled to room temperature to obtain a final thallium removal agent.

[0020] Preferably, the stirring condition includes a stirring speed of 350-400 r / min and a stirring time of 20-30 min.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention can effectively remove thallium ions in water, and the quality of the treated water meets environmental protection standards; the method of use is simple, and no complicated equipment support is required, and the method is applicable to water treatment occasions of various scales; the method is environmentally friendly, safe, and has no secondary pollution; at the same time, the nano-modified particles and the solvent are coordinated with each other to optimize the thallium removal efficiency of the product; at the same time, the thallium removal efficiency of the product is remarkable under low temperature environment. DETAILED DESCRIPTION

[0023] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with specific embodiments. 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] The present embodiment is a thallium removal agent for mineral processing wastewater, which includes sodium hydrosulfide, sodium hydroxide, nano-modified particles and a solvent; wherein the mass ratio of sodium hydrosulfide, sodium hydroxide, nano-modified particles and the solvent is (2-5):1:(2-3):11.

[0025] The preparation method of the nano-modified particles of this embodiment is:

[0026] S01: heat-treat the nano-bentonite at 320-330°C for 10-20 min, then cool to 55°C at a rate of 2-5°C / min, and keep warm;

[0027] S02: mixing the heat-insulated nano-bentonite with a sodium dodecylbenzene sulfonate solution in an amount of 2-5 times the total amount of the heat-insulated nano-bentonite to obtain a nano-bentonite solution;

[0028] S03: 2-5 parts of yttrium nitrate solution, 1-3 parts of nano silica sol, 1-2 parts of silane coupling agent KH560, and 2-5 parts of hydroxyapatite are mixed to obtain a modified solution;

[0029] S04: The nano-bentonite liquid and the modified liquid are mixed and ball-milled in a weight ratio of 4:3. After the ball-milling is completed, the mixture is washed with water and dried to obtain nano-modified particles.

[0030] The mass fraction of the sodium dodecylbenzenesulfonate solution in this embodiment is 2-5%; the mass fraction of the yttrium nitrate solution is 2-4%.

[0031] The mixed ball milling process of this embodiment has a ball milling speed of 1000-1500 r / min and the ball milling is performed for 2 hours.

[0032] The preparation method of the solvent of this embodiment is:

[0033] The nano-silicon dioxide is subjected to proton irradiation treatment at a power of 350-400W for 10-20 minutes, and the nano-silicon dioxide agent is obtained after the irradiation is completed;

[0034] 1-3 parts of nano-silica and 2-5 parts of silane coupling agent KH550 are added to 3-5 parts of chitosan solution and mixed to obtain a solvent.

[0035] The mass fraction of the chitosan solution in this embodiment is 4-7%.

[0036] The preparation method of the thallium removal agent of this embodiment is:

[0037] Slowly add sodium hydroxide to adjust to the desired pH value;

[0038] Under stirring conditions, sodium hydrosulfide, nano-modified particles and solvent are continuously stirred until they are fully mixed, and then cooled to room temperature to obtain a final thallium removal agent.

[0039] The stirring conditions of this embodiment are a stirring speed of 350-400 r / min and a stirring time of 20-30 min.

[0040] The method for adding a thallium removal agent comprises the following steps:

[0041] a. Determine the thallium content of the water to be treated;

[0042] b. Calculate the required dosage of the reagent according to the thallium content;

[0043] c. Adding thallium removal agent into the water to be treated;

[0044] d. Stir thoroughly to ensure that the reagent and thallium ions react fully;

[0045] e. Let it stand to allow the sediment to settle;

[0046] f. Remove the supernatant and collect the precipitate for safe disposal.

[0047] Example 1.

[0048] The present embodiment is a thallium removal agent for mineral processing wastewater, which includes sodium hydrosulfide, sodium hydroxide, nano-modified particles and a solvent; wherein the mass ratio of the sodium hydrosulfide, sodium hydroxide, nano-modified particles and the solvent is 2:1:2:11.

[0049] The preparation method of the nano-modified particles of this embodiment is:

[0050] S01: The nano-bentonite was first heat treated at 320°C for 10 min, then cooled to 55°C at a rate of 2°C / min and kept warm;

[0051] S02: mixing the heat-insulated nano-bentonite with a sodium dodecylbenzene sulfonate solution in an amount of 2-5 times the total amount of the heat-insulated nano-bentonite to obtain a nano-bentonite solution;

[0052] S03: 2 parts of yttrium nitrate solution, 1 part of nano silica sol, 1 part of silane coupling agent KH560, and 2 parts of hydroxyapatite are mixed to obtain a modified solution;

[0053] S04: The nano-bentonite liquid and the modified liquid are mixed and ball-milled in a weight ratio of 4:3. After the ball-milling is completed, the mixture is washed with water and dried to obtain nano-modified particles.

[0054] The mass fraction of the sodium dodecylbenzenesulfonate solution in this embodiment is 2%; the mass fraction of the yttrium nitrate solution is 2%.

[0055] The mixed ball milling process of this embodiment has a ball milling speed of 1000 r / min and a ball milling time of 2 h.

[0056] The preparation method of the solvent of this embodiment is:

[0057] The nano-silicon dioxide was treated by proton irradiation, the irradiation power was 350W, the irradiation was performed for 10 minutes, and the nano-silicon dioxide agent was obtained after the irradiation was completed;

[0058] 1 part of nano-silica agent and 2 parts of silane coupling agent KH550 were added to 3 parts of chitosan solution and mixed thoroughly to obtain a solvent.

[0059] The mass fraction of the chitosan solution in this example is 4%.

[0060] The preparation method of the thallium removal agent of this embodiment is:

[0061] Slowly add sodium hydroxide to adjust to the desired pH value;

[0062] Under stirring conditions, sodium hydrosulfide, nano-modified particles and solvent are continuously stirred until they are fully mixed, and then cooled to room temperature to obtain a final thallium removal agent.

[0063] The stirring conditions of this embodiment are a stirring speed of 350 r / min and stirring for 20 min.

[0064] The method for adding a thallium removal agent comprises the following steps:

[0065] a. Determine the thallium content of the water to be treated;

[0066] b. Calculate the required dosage of the reagent according to the thallium content;

[0067] c. Adding thallium removal agent into the water to be treated;

[0068] d. Stir thoroughly to ensure that the reagent and thallium ions react fully;

[0069] e. Let it stand to allow the sediment to settle;

[0070] f. Remove the supernatant and collect the precipitate for safe disposal.

[0071] Example 2.

[0072] The present embodiment is a thallium removal agent for mineral processing wastewater, which includes sodium hydrosulfide, sodium hydroxide, nano-modified particles and a solvent; wherein the mass ratio of the sodium hydrosulfide, sodium hydroxide, nano-modified particles and the solvent is 5:1:3:11.

[0073] The preparation method of the nano-modified particles of this embodiment is:

[0074] S01: The nano-bentonite was first heat treated at 330°C for 20 min, then cooled to 55°C at a rate of 5°C / min and kept warm;

[0075] S02: mixing the heat-insulated nano-bentonite with a sodium dodecylbenzene sulfonate solution in an amount 5 times the total amount of the heat-insulated nano-bentonite to obtain a nano-bentonite solution;

[0076] S03: 5 parts of yttrium nitrate solution, 3 parts of nano silica sol, 2 parts of silane coupling agent KH560, and 5 parts of hydroxyapatite are fully mixed to obtain a modified solution;

[0077] S04: The nano-bentonite liquid and the modified liquid are mixed and ball-milled in a weight ratio of 4:3. After the ball-milling is completed, the mixture is washed with water and dried to obtain nano-modified particles.

[0078] The mass fraction of the sodium dodecylbenzenesulfonate solution in this embodiment is 5%; the mass fraction of the yttrium nitrate solution is 4%.

[0079] The mixed ball milling process of this embodiment was carried out at a ball milling speed of 1500 r / min and the ball milling was carried out for 2 h.

[0080] The preparation method of the solvent of this embodiment is:

[0081] The nano-silicon dioxide was subjected to proton irradiation treatment at a power of 400 W for 20 minutes, and the nano-silicon dioxide agent was obtained after the irradiation was completed;

[0082] 3 parts of nano-silica agent and 5 parts of silane coupling agent KH550 were added to 5 parts of chitosan solution and mixed thoroughly to obtain a solvent.

[0083] The mass fraction of the chitosan solution in this example is 7%.

[0084] The preparation method of the thallium removal agent of this embodiment is:

[0085] Slowly add sodium hydroxide to adjust to the desired pH value;

[0086] Under stirring conditions, sodium hydrosulfide, nano-modified particles and solvent are continuously stirred until they are fully mixed, and then cooled to room temperature to obtain a final thallium removal agent.

[0087] The stirring conditions of this embodiment are a stirring speed of 400 r / min and stirring for 30 min.

[0088] The method for adding a thallium removal agent comprises the following steps:

[0089] a. Determine the thallium content of the water to be treated;

[0090] b. Calculate the required dosage of the reagent according to the thallium content;

[0091] c. Adding thallium removal agent into the water to be treated;

[0092] d. Stir thoroughly to ensure that the reagent and thallium ions react fully;

[0093] e. Let it stand to allow the sediment to settle;

[0094] f. Remove the supernatant and collect the precipitate for safe disposal.

[0095] Example 3.

[0096] The present embodiment is a thallium removal agent for mineral processing wastewater, which includes sodium hydrosulfide, sodium hydroxide, nano-modified particles and a solvent; wherein the mass ratio of the sodium hydrosulfide, sodium hydroxide, nano-modified particles and the solvent is 3.5:1:2.5:11.

[0097] The preparation method of the nano-modified particles of this embodiment is:

[0098] S01: The nano-bentonite was first heat treated at 325°C for 15 min, then cooled to 55°C at a rate of 3.5°C / min and kept warm;

[0099] S02: mixing the heat-insulated nano-bentonite with a sodium dodecylbenzene sulfonate solution in an amount 3.5 times the total amount of the heat-insulated nano-bentonite to obtain a nano-bentonite solution;

[0100] S03: 3.5 parts of yttrium nitrate solution, 2 parts of nano silica sol, 1.5 parts of silane coupling agent KH560, and 3.5 parts of hydroxyapatite are mixed to obtain a modified solution;

[0101] S04: The nano-bentonite liquid and the modified liquid are mixed and ball-milled in a weight ratio of 4:3. After the ball-milling is completed, the mixture is washed with water and dried to obtain nano-modified particles.

[0102] The mass fraction of the sodium dodecylbenzenesulfonate solution in this embodiment is 3.5%; the mass fraction of the yttrium nitrate solution is 3%.

[0103] The mixed ball milling process of this embodiment was carried out at a ball milling speed of 1250 r / min and the ball milling was carried out for 2 h.

[0104] The preparation method of the solvent of this embodiment is:

[0105] The nano-silicon dioxide was treated by proton irradiation, the irradiation power was 370W, the irradiation was performed for 15 minutes, and the nano-silicon dioxide agent was obtained after the irradiation was completed;

[0106] 2 parts of nano-silica and 3.5 parts of silane coupling agent KH550 were added to 4 parts of chitosan solution and mixed to obtain a solvent.

[0107] The mass fraction of the chitosan solution in this example is 5.5%.

[0108] The preparation method of the thallium removal agent of this embodiment is:

[0109] Slowly add sodium hydroxide to adjust to the desired pH value;

[0110] Under stirring conditions, sodium hydrosulfide, nano-modified particles and solvent are continuously stirred until they are fully mixed, and then cooled to room temperature to obtain a final thallium removal agent.

[0111] The stirring conditions of this embodiment are a stirring speed of 370 r / min and stirring for 25 min.

[0112] The method for adding a thallium removal agent comprises the following steps:

[0113] a. Determine the thallium content of the water to be treated;

[0114] b. Calculate the required dosage of the reagent according to the thallium content;

[0115] c. Adding thallium removal agent into the water to be treated;

[0116] d. Stir thoroughly to ensure that the reagent and thallium ions react fully;

[0117] e. Let it stand to allow the sediment to settle;

[0118] f. Remove the supernatant and collect the precipitate for safe disposal.

[0119] Comparative Example 1.

[0120] The difference from Example 3 is that no nano-modified particles are added.

[0121] Comparative Example 2.

[0122] The difference from Example 3 is that the preparation method of the nano-modified particles is different;

[0123] S01: Mix the nano-bentonite with a sodium dodecylbenzene sulfonate solution which is 2-5 times the total amount of the nano-bentonite and is kept warm to obtain a nano-bentonite solution;

[0124] S02: Blending 2-5 parts of yttrium nitrate solution and 1-3 parts of nano-silica sol to obtain a modified solution;

[0125] S03: The nano-bentonite liquid and the modified liquid are mixed in a weight ratio of 4:3 and subjected to ball milling. After the ball milling is completed, the mixture is washed with water and dried to obtain nano-modified particles.

[0126] The mass fraction of the sodium dodecylbenzenesulfonate solution in this embodiment is 2-5%; the mass fraction of the yttrium nitrate solution is 2-4%.

[0127] The mixed ball milling process of this embodiment has a ball milling speed of 1000-1500 r / min and the ball milling is performed for 2 hours.

[0128] Comparative Example 3.

[0129] The difference from Example 3 is that no modification liquid treatment is used in the preparation of the nano-modified particles.

[0130] Comparative Example 4.

[0131] The difference from Example 3 is that no nano silicon dioxide agent is added to the solvent.

[0132] The product performance tests of Examples 1-3 and Comparative Examples 1-4 are as follows:

[0133]

[0134] It can be seen from Comparative Examples 1-4 and Example 3 that the product of Example 3 has an excellent thallium removal rate, and still has an excellent thallium removal rate under different low temperature environments. The product does not add nano-modified particles, and the solvent does not add nano-silicon dioxide. The product performance has a significant deterioration trend. The preparation methods of the nano-modified particles are different, and the product performance has different deterioration trends. Only by using the raw material formula of the present invention, the product performance effect is most significant.

[0135] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0136] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A reagent for removing thallium from mineral processing wastewater, characterized in that: The thallium removal agent includes sodium hydrosulfide, sodium hydroxide, nano-modified particles and a solvent; wherein the mass ratio of the sodium hydrosulfide, sodium hydroxide, nano-modified particles and the solvent is (2-5):1:(2-3):11; The preparation method of the nano modified particles is: S01: heat-treat the nano-bentonite at 320-330°C for 10-20 min, then cool to 55°C at a rate of 2-5°C / min, and keep warm; S02: mixing the heat-insulated nano-bentonite with a sodium dodecylbenzene sulfonate solution in an amount of 2-5 times the total amount of the heat-insulated nano-bentonite to obtain a nano-bentonite solution; S03: 2-5 parts of yttrium nitrate solution, 1-3 parts of nano silica sol, 1-2 parts of silane coupling agent KH560, and 2-5 parts of hydroxyapatite are mixed to obtain a modified solution; S04: mixing the nano-bentonite liquid and the modified liquid in a weight ratio of 4:3 and subjecting them to ball milling. After the ball milling is completed, washing and drying are performed to obtain nano-modified particles. The mass fraction of the sodium dodecylbenzene sulfonate solution is 2-5%; the mass fraction of the yttrium nitrate solution is 2-4%; The mixed ball milling process is performed at a ball milling speed of 1000-1500 r / min for 2 hours; The preparation method of the solvent body is: The nano-silicon dioxide is subjected to proton irradiation treatment at a power of 350-400W for 10-20 minutes, and the nano-silicon dioxide agent is obtained after the irradiation is completed; 1-3 parts of nano-silica and 2-5 parts of silane coupling agent KH550 are added to 3-5 parts of chitosan solution and mixed to obtain a solvent; The mass fraction of the chitosan solution is 4-7%.

2. The thallium removal agent for mineral processing wastewater according to claim 1, characterized in that: The preparation method of the thallium removal agent is as follows: Slowly add sodium hydroxide to adjust to the desired pH value; Under stirring conditions, sodium hydrosulfide, nano-modified particles and solvent are continuously stirred until they are fully mixed, and then cooled to room temperature to obtain the final thallium removal agent.

3. The agent for removing thallium from ore dressing wastewater according to claim 2, characterized in that: The stirring condition includes a stirring speed of 350-400 r / min and stirring for 20-30 min.

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