Method of reducing the hydrophobicity of ilmenite flotation concentrate surfaces

Abstract

The application discloses a method for reducing the surface hydrophobicity of ilmenite flotation concentrate, and belongs to the field of comprehensive utilization of vanadium-titanium magnetite titanium resources. The method comprises the following steps: a. preparing a reaction device; b. intercepting the flotation concentrate slurry, and adding reagent A dropwise to fully react with the slurry; c. adding reagent B dropwise to the slurry to fully react with the slurry; and d. dehydrating the reacted slurry in a filter press to obtain ilmenite flotation concentrate with low surface hydrophobicity. The method can significantly reduce the surface wettability of ilmenite flotation concentrate, significantly increase the recovery of titanium resources, and is beneficial to subsequent drying and balling processes, and can effectively solve the problem that the surface hydrophobicity of the existing ilmenite flotation concentrate is high, thereby affecting the subsequent concentration treatment effect.

Description

Technical Field

[0001] This invention belongs to the field of comprehensive utilization of titanium resources in vanadium-titanium magnetite, and specifically relates to a method for reducing the hydrophobicity of the surface of ilmenite flotation concentrate. Background Technology

[0002] The recovery of middlings titanium resources from iron tailings in vanadium-titanium magnetite ore beneficiation has undergone several innovations, evolving from spiral sluice gravity separation-flotation desulfurization-drying-electrostatic separation to the now widely used high-intensity magnetic separation-flotation desulfurization-flotation titanium separation. Because flotation reagents are added during flotation desulfurization and titanium separation, they adsorb onto the mineral surface, causing ilmenite to form flocs in the slurry. This is detrimental to the concentration of titanium concentrate and significantly impacts subsequent drying and pelletizing processes. Therefore, reducing the hydrophobicity of ilmenite flotation concentrate surfaces has strong market demand and application prospects. Currently, ilmenite flotation concentrate is directly fed into a thickener for concentration, then filtered, dried, and pelletized. During the concentration process, fine ilmenite particles in the overflow enter the circulating water, easily clogging pipes and degrading water quality. During the drying process, some organic impurities are discharged into the waste gas. The hydrophobic surface of the dried titanium concentrate affects pelletizing efficiency.

[0003] Therefore, there is an urgent need to study a method to reduce the hydrophobicity of the surface of ilmenite flotation concentrate. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that the surface hydrophobicity of existing ilmenite flotation concentrate is relatively high, which affects the effect of subsequent concentration treatment.

[0005] The technical solution adopted by this invention to solve its technical problem is: a method for reducing the hydrophobicity of the surface of ilmenite flotation concentrate, comprising the following steps:

[0006] a. Preparation of reaction apparatus: including a stirred tank 1, a concentrator, a stirred tank 2, and a filter press connected in sequence, and also including a reagent A storage container connected to the stirred tank 1 and a reagent B storage container connected to the stirred tank 2.

[0007] b. Take the flotation concentrate slurry after the flotation step and before the concentration step in the ilmenite flotation concentrate process, and let it flow into the mixing tank 1 continuously. At the same time, turn on the reagent A storage tank and add reagent A dropwise into the mixing tank 1 to fully react with the slurry.

[0008] c. After the reaction in step b, the slurry flows into the thickener for concentration, and the underflow from the thickener flows into the mixing tank 2. At the same time, the reagent B storage tank is turned on to add reagent B dropwise into the mixing tank 2 to fully react with the slurry.

[0009] d. After the reaction in step c, the slurry flows by gravity into a filter press for dewatering, yielding ilmenite flotation concentrate with low surface hydrophobicity.

[0010] In step a above, the mixing tank is equipped with a lid, a circulation hole, and a baffle plate; the concentrator is an inclined tube concentrator; and the reagent A storage container and the reagent B storage container are stainless steel containers equipped with valves.

[0011] In the above-mentioned method for reducing the surface hydrophobicity of ilmenite flotation concentrate, depending on the specific production scale and for the purpose of thorough mixing, a series of interconnected mixing tanks 11 to 12 are provided. n The mixing tank 11 is connected to the storage container of reagent A. n Connected to the concentrator.

[0012] In the above-mentioned method for reducing the surface hydrophobicity of ilmenite flotation concentrate, depending on the specific production scale and for the purpose of thorough mixing, a series of interconnected mixing tanks 21 to 2 are provided. n The mixing tank 21 is connected to both the concentrator and the reagent B storage container. n Connected to a filter press.

[0013] In step b above, the slurry concentration in the mixing tank 1 is controlled to be 30% to 40%; the stirring speed of the mixing tank 1 is controlled to be 1000 to 1500 rad / min; and the dripping flow rate of reagent A is controlled to be 200-400 g / t of dry ilmenite flotation concentrate.

[0014] Furthermore, the agent A is dimethyl silicone oil.

[0015] In step c above, the concentration of the thickener underflow is controlled at 50% to 70%; the stirring speed of the mixing tank 1 is controlled at 1000 to 1500 rad / min; and the dripping flow rate of reagent B is controlled at 300-500 g / t of ilmenite flotation concentrate dry ore.

[0016] Furthermore, the reagent B is a mixed solution of sodium silicate and sodium carbonate, with a concentration of 10% and a mass ratio of Na2CO3 to Na2SiO3 of 1:1.

[0017] In step c above, the overflow from the thickener is circulated into the flotation receiving tank for ilmenite flotation concentrate.

[0018] In step d above, the filtrate from the pressure filter is collected in the concentrator and used as circulating water.

[0019] The beneficial effects of this invention are as follows: This invention provides a method for reducing the surface hydrophobicity of ilmenite flotation concentrate. For the flotation concentrate after flotation and before concentration in the ilmenite flotation process, a method of one-time reagent addition and sealed stirring – concentration – secondary reagent addition and stirring – filtration – and recycling of the concentration overflow and filtered water is employed, resulting in ilmenite flotation concentrate with lower surface hydrophobicity. This method can significantly reduce the surface wettability of ilmenite flotation concentrate, significantly increase titanium resource recovery, and facilitate subsequent drying and pelletizing processes. It reduces titanium resource loss during the dewatering process of ilmenite flotation concentrate while improving titanium resource utilization. This invention lays the foundation for the further economic utilization of ilmenite flotation concentrate and will have significant economic benefits and promotional value. Detailed Implementation

[0020] The technical solution of the present invention can be implemented in the following manner.

[0021] A method for reducing the surface hydrophobicity of ilmenite flotation concentrate includes the following steps:

[0022] a. Preparation of reaction apparatus: including a stirred tank 1, a concentrator, a stirred tank 2, and a filter press connected in sequence, and also including a reagent A storage container connected to the stirred tank 1 and a reagent B storage container connected to the stirred tank 2.

[0023] b. Take the flotation concentrate slurry after the flotation step and before the concentration step in the ilmenite flotation concentrate process, and let it flow into the mixing tank 1 continuously. At the same time, turn on the reagent A storage tank and add reagent A dropwise into the mixing tank 1 to fully react with the slurry.

[0024] c. After the reaction in step b, the slurry flows into the thickener for concentration, and the underflow from the thickener flows into the mixing tank 2. At the same time, the reagent B storage tank is turned on to add reagent B dropwise into the mixing tank 2 to fully react with the slurry.

[0025] d. After the reaction in step c, the slurry flows by gravity into a filter press for dewatering, yielding ilmenite flotation concentrate with low surface hydrophobicity.

[0026] In step a above, the mixing tank is equipped with a lid, circulation holes, and baffles; the thickener is an inclined tube thickener; and the reagent A and reagent B storage containers are stainless steel containers equipped with valves. Using a covered mixing tank prevents slurry splashing during high-speed mixing, allowing the slurry to fully interact with the reagents under certain pressure conditions. Furthermore, high-speed mixing effectively removes organic flotation reagents adsorbed on the surface of ilmenite particles.

[0027] In the above-mentioned method for reducing the surface hydrophobicity of ilmenite flotation concentrate, depending on the specific production scale and for the purpose of thorough mixing, a series of interconnected mixing tanks 11 to 12 are provided. n The mixing tank 11 is connected to the storage container of reagent A. nConnected to a concentrator; equipped with sequentially connected mixing tanks 21 to 2 n The mixing tank 21 is connected to both the concentrator and the reagent B storage container. n Connected to a filter press.

[0028] In step b above, the slurry concentration in the mixing tank 1 is controlled to be 30%–40%; the stirring speed of the mixing tank 1 is controlled to be 1000–1500 rad / min; and the dripping flow rate of reagent A is controlled to be 200–400 g / t of dry ilmenite flotation concentrate. Preferably, reagent A is dimethyl silicone oil, which can reduce the surface tension of foam and thus achieve defoaming.

[0029] In step c above, the underflow concentration of the thickener is controlled to be 50%–70%; the stirring speed of the mixing tank 1 is controlled to be 1000–1500 rad / min; and the dripping flow rate of reagent B is controlled to be 300–500 g / t of dry ilmenite flotation concentrate. Preferably, reagent B is a mixed solution of sodium silicate and sodium carbonate, with a mixed solution concentration of 10%, and the mass ratio of Na₂CO₃ to Na₂SiO₃ in the mixed solution is 1:1. The reagent B (Na₂CO₃ and Na₂SiO₃) used can increase the pH value of the slurry, making it weakly alkaline. Under weakly alkaline conditions, the solubility of organic flotation reagents in the slurry increases, which will react with Ca... 2+ Mg 2+ Fe 2+ Fe 3+ Plasma forms precipitates or complexes, reducing the adsorption of organic flotation agents on the surface of ilmenite particles, and CO3... 2- SiO3 2- The organic flotation agent competes with the adsorption of organic flotation agents on the surface of ilmenite particles, which also reduces the amount of organic flotation agent adsorbed on the surface of ilmenite particles; at the same time, Na2CO3 and Na2SiO3 have the effect of dispersing fine particles.

[0030] In step c above, the overflow from the thickener is circulated into the flotation receiving tank for ilmenite flotation concentrate.

[0031] In step d above, the filtrate from the pressure filter is collected in the concentrator and used as circulating water.

[0032] The technical solution of the present invention achieves defoaming and allows the organic flotation agent to detach from the surface of ilmenite particles and enter the aqueous solution by adopting the above measures, thus greatly reducing the hydrophobicity of the surface of the flotation titanium concentrate particles.

[0033] The technical solution and effects of the present invention will be further explained below through practical examples.

[0034] Example

[0035] The main physicochemical properties of the ore described in this embodiment are as follows: The raw ilmenite flotation concentrate sample contains fixed amounts of C 0.063%, TFe 32.40%, SiO 22.37%, CaO 0.70%, MgO 4.78%, Al 2O 30.98%, TiO 247.41%, S 0.141%, Co 0.011%, Ni 0.001%, Cu 0.009%, Na 2O 0.125%, K 2O 0.037%, As 0.003%, and P < 0.01%. The sample contains ilmenite (93.75%), labradorite (1.50%), amphibole (1.42%), pyroxene (1.05%), sphene (0.86%), titanomagnetite (0.75%), olivine (0.20%), and pyrrhotite (0.19%).

[0036] This embodiment is a laboratory-scale continuous pilot-scale test, using final ilmenite flotation concentrate produced on-site as raw material. The raw ore processing capacity is 50 kg / h of dry ore. The specific test process is as follows.

[0037] I. Preparation Procedures

[0038] 1. Prepare the reaction apparatus: including a stirring tank 11, a stirring tank 12, a concentrator, a stirring tank 21, a stirring tank 22, and a filter press connected in sequence, and also including a reagent A storage container connected to the stirring tank 11 and a reagent B storage container connected to the stirring tank 21;

[0039] The mixing tank (30L capacity) is equipped with a sealing cover, circulation holes and baffles; the thickener is a TY-1 type inclined tube thickener; the filter press is a BASY0.6 / 300U type full diaphragm filter press; the reagent A storage container (1L capacity) and the reagent B storage container (10L capacity) are stainless steel containers equipped with valves.

[0040] 2. Preparation of reagents: Reagent A is dimethyl silicone oil stock solution, which is stored in reagent A storage container for later use; Reagent B is a mixed solution of sodium silicate and sodium carbonate (concentration of 10%), in which the mass ratio of Na2CO3 to Na2SiO3 is 1:1, which is stored in reagent B storage container for later use.

[0041] 3. Preparation of slurry: The approximately 600L of slurry cut from the feed port of the on-site thickener is evenly divided into 20 portions of raw slurry with a volume of 30L each using a slurry distributor. The divided raw slurry is placed in the mixing tank 11. When the slurry in the mixing tank 11 is about to run out, a new 30L of slurry is added to keep the entire reaction process uninterrupted and continuous.

[0042] II. The method for initiating the reaction and reducing the hydrophobicity of the ilmenite flotation concentrate surface includes the following steps:

[0043] a. Turn on the mixing tank 11, control the slurry flow rate to 2.4 L / min, and adjust the main shaft speed of the mixing tank 11 to 1200 rad / min; at the same time, turn on the reagent A storage tank to add reagent A dropwise into the mixing tank 11 to react with the slurry, and adjust the reagent A flow rate to 0.2 mL / min;

[0044] b. Start the mixing tank 12. The slurry after the reaction in the mixing tank 11 flows into the mixing tank 12 to continue the reaction. Adjust the main shaft speed of the mixing tank 12 to 1200 rad / min.

[0045] c. The slurry after reaction in the mixing tank 12 flows into the TY-1 inclined tube thickener by gravity. Adjust the bottom valve of the inclined tube thickener to make its flow rate 1.3L / min. The overflow of the inclined tube thickener is connected to the waste liquid tank through a pipe.

[0046] d. Turn on the mixing tank 21. The underflow from the inclined tube thickener flows into the mixing tank 21 by gravity. Adjust the main shaft speed of the mixing tank 21 to 1200 rad / min. At the same time, turn on the reagent B storage tank and add reagent B dropwise into the mixing tank 21 to react with the slurry. Adjust the flow rate of reagent B to 3.4 mL / min.

[0047] e. Start the mixing tank 22. The slurry after the reaction in the mixing tank 11 flows into the mixing tank 22 to continue the reaction. Adjust the main shaft speed of the mixing tank 22 to 1200 rad / min.

[0048] f. The slurry after reaction in the mixing tank 22 flows by gravity into the feed trough of the BASY0.6 / 300U type full diaphragm filter press for dewatering. The filter cake of the filter press is the treated ilmenite flotation concentrate with low surface hydrophobicity. The filtrate is pumped to the mixing tank 21 by the XBSL1 / 4 vertical sand pump.

[0049] The results show that, in the example, using the above-mentioned equipment and process flow, the surface contact angle of the ilmenite flotation concentrate decreased from 125° to 71.68°, the fixed C content decreased from 0.063% to 0.031%, the fine-grained ilmenite content in the circulating water decreased from 0.5% to 0.1%, and the TiO2 recovery rate in the concentration and filtration stage increased from 99.14% to 99.83%.

Claims

1. A method for reducing the surface hydrophobicity of ilmenite flotation concentrate, characterized in that, Includes the following steps: a. Preparation of reaction apparatus: including a stirred tank 1, a concentrator, a stirred tank 2, and a filter press connected in sequence, and also including a reagent A storage container connected to the stirred tank 1 and a reagent B storage container connected to the stirred tank 2. b. Take the flotation concentrate slurry after the flotation step and before the concentration step in the ilmenite flotation concentrate process, and let it flow into the mixing tank 1 continuously. At the same time, turn on the reagent A storage tank and add reagent A dropwise into the mixing tank 1 to fully react with the slurry. c. After the reaction in step b, the slurry flows into the thickener for concentration, and the underflow from the thickener flows into the mixing tank 2. At the same time, the reagent B storage tank is turned on to add reagent B dropwise into the mixing tank 2 to fully react with the slurry. d. The slurry after the reaction in step c flows into a filter press for dewatering to obtain ilmenite flotation concentrate with low surface hydrophobicity; The agent A is dimethyl silicone oil; The reagent B is a mixed solution of sodium silicate and sodium carbonate, with a concentration of 10% and a mass ratio of Na2CO3 to Na2SiO3 of 1:

1.

2. The method for reducing the surface hydrophobicity of ilmenite flotation concentrate according to claim 1, characterized in that: In step a, the mixing tank is equipped with a lid, a circulation hole, and a baffle plate; the concentrator is an inclined tube concentrator; and the reagent A storage container and the reagent B storage container are stainless steel containers equipped with valves.

3. The method for reducing the surface hydrophobicity of ilmenite flotation concentrate according to claim 1 or 2, characterized in that: For the purpose of thorough mixing, there are mixing tanks 11 to 12 connected in sequence. n The mixing tank 11 is connected to the storage container of reagent A. n Connected to the concentrator.

4. The method for reducing the surface hydrophobicity of ilmenite flotation concentrate according to claim 1 or 2, characterized in that: For the purpose of thorough mixing, mixing tanks 21 to 2 are connected in sequence. n The mixing tank 21 is connected to both the concentrator and the reagent B storage container. n Connected to a filter press.

5. The method for reducing the surface hydrophobicity of ilmenite flotation concentrate according to claim 1, characterized in that: In step b, the slurry concentration in the mixing tank 1 is controlled to be 30%~40%; the stirring speed of the mixing tank 1 is controlled to be 1000~1500 rad / min; and the dripping flow rate of reagent A is controlled to be 200-400 g / t of ilmenite flotation concentrate dry ore.

6. The method for reducing the surface hydrophobicity of ilmenite flotation concentrate according to claim 1, characterized in that: In step c, the concentration of the thickener underflow is controlled at 50%~70%; the stirring speed of the mixing tank 1 is controlled at 1000~1500 rad / min; and the dripping flow rate of reagent B is controlled at 300-500 g / t of ilmenite flotation concentrate dry ore.

7. The method for reducing the surface hydrophobicity of ilmenite flotation concentrate according to claim 1, characterized in that: In step c, the overflow from the thickener is circulated into the flotation receiving tank for ilmenite flotation concentrate.

8. The method for reducing the surface hydrophobicity of ilmenite flotation concentrate according to claim 1, characterized in that: In step d, the filtrate from the pressure filter is collected in the concentrator and used as circulating water.