CN112221715A - Method for screening magnesite with low silicon dioxide content - Google Patents
Method for screening magnesite with low silicon dioxide content Download PDFInfo
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- CN112221715A CN112221715A CN202010795172.8A CN202010795172A CN112221715A CN 112221715 A CN112221715 A CN 112221715A CN 202010795172 A CN202010795172 A CN 202010795172A CN 112221715 A CN112221715 A CN 112221715A
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B1/00—Conditioning for facilitating separation by altering physical properties of the matter to be treated
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- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/001—Flotation agents
- B03D1/002—Inorganic compounds
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- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/001—Flotation agents
- B03D1/004—Organic compounds
- B03D1/01—Organic compounds containing nitrogen
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/001—Flotation agents
- B03D1/004—Organic compounds
- B03D1/012—Organic compounds containing sulfur
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/001—Flotation agents
- B03D1/018—Mixtures of inorganic and organic compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2201/00—Specified effects produced by the flotation agents
- B03D2201/02—Collectors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2201/00—Specified effects produced by the flotation agents
- B03D2201/06—Depressants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2203/00—Specified materials treated by the flotation agents; specified applications
- B03D2203/02—Ores
- B03D2203/04—Non-sulfide ores
Abstract
The invention discloses a screening method of magnesite with low silicon dioxide content, belonging to the technical field of mineral resource processing. It comprises the following steps: (1) cleaning magnesite: taking low-grade magnesite as a raw material, cleaning, and removing mud and micro-fine particle minerals on the surface of the magnesite; (2) grinding magnesite: grinding the magnesite cleaned in the step (1) to prepare mineral powder; (3) pulping of magnesite: adding water into the ground mineral powder in the step (2), uniformly mixing, and performing size mixing to obtain ore pulp; (4) flotation of magnesite: feeding the pulp prepared in the step (3) into flotation equipment for reverse flotation to prepare concentrate powder; (5) drying magnesite: and (4) adding water into the concentrate powder subjected to flotation in the step (4), cleaning and drying. The concentrate powder prepared by the method has good performance advantages, and the yield, the content of magnesium oxide, the content of silicon dioxide, the content of calcium oxide and other test parameters show significant differences, and is high-quality concentrate powder.
Description
Technical Field
The invention belongs to the technical field of mineral resource processing, and particularly relates to a method for screening magnesite with low silicon dioxide content.
Background
The magnesite resources in China are rich, and the reserve is proved to be the first in the world. At present, most of magnesium materials produced and exported in China are raw material primary processing products, and the benefits of low-grade products and high-grade products are different by tens of times. In addition, the international market shows the trend that the demand for the primary magnesium material is gradually reduced and the demand for high-grade products is gradually increased, so the processing depth of the magnesium refractory material is required to be increased; the development and production of high-grade magnesite, magnesite bricks and unshaped refractory materials are one of the development directions of the magnesia materials. However, the excessive exploitation of magnesite resources for many years leads to serious overdraft of high-grade resources with the MgO content of more than 46%. With the continuous development of resources and the continuous improvement of the requirements of magnesium refractory materials on raw materials, the mineral resources capable of meeting the requirements are less and less. Meanwhile, the low-grade magnesite accounting for more than 60% of the total reserves is abandoned, which causes serious waste of resources and environmental pollution.
At present, the requirement of magnesite in high temperature industry is different according to different purposes. The harmful impurities in magnesite ore are mainly SiO2And CaO. Wherein SiO is2The formation of fusible silicates during calcination greatly weakens the strength of the refractory. SiO 22The method is one of the most harmful impurities in the magnesite, and the high content of the silicon-calcium impurities is an important factor for restricting the development and utilization of low-grade magnesite. The magnesite is widely used as a refractory lining material required by industrial smelting furnaces in high-temperature industries such as metallurgy, glass and the like, and SiO in the magnesite2Easily soluble silicates are formed during the calcination process, significantly reducing the strength of the refractory. Thus, SiO in magnesite is removed2Is the key for fully utilizing magnesite resources and developing high-end products.
At present, SiO is mostly adopted in China2Producing SiO from magnesite raw ore less than or equal to 3 percent by reverse flotation2Is 0.3% of concentrate. Therefore, the development of high-grade magnesium materials requires high-grade raw materials, and the high-grade natural magnesite is limited and less in storage amount. Therefore, the low-SiO is developed by utilizing low-grade magnesite resources2The high-grade and high-grade magnesia refractory raw materials such as magnesite concentrate have the advantages of domestic advanced technical level, wide market prospect, huge future development space, obvious economic benefit and social benefit, and are also the key supporting direction for the development of the national industry and the Liaoning industry.
The project combines the low-grade magnesite flotation purification technology independently developed by the company, and can effectively remove SiO in magnesite by developing and testing novel flotation reagents and process optimization2The impurities are equal, and SiO is prepared2The concentrate powder with the concentration less than or equal to 0.2 percent has very important practical significance for the development and utilization of magnesite resources in China, particularly the comprehensive utilization of low-grade magnesite resources in the Haicheng area.
Disclosure of Invention
1. Problems to be solved
Aiming at the problems in the prior art, the invention provides the method for screening the magnesite with low silicon dioxide content, compared with the prior art, the concentrate powder prepared by the method has good performance advantages, and the test parameters such as yield, magnesium oxide content, silicon dioxide content, calcium oxide content and the like show significant differences and is high-quality concentrate powder. Specifically, magnesite ore of the invention is magnesite tailing with silicon dioxide content of about 3.0%, wherein silicon mainly exists in magnesite in different forms, the optimal grinding fineness is determined, and the selection and optimization of a collecting agent, an inhibitor and a pH value are carried out, so as to finally screen magnesite concentrate powder with low silicon dioxide.
2. Technical scheme
In order to solve the problems, the technical scheme provided by the invention is as follows:
a method for screening magnesite with low silicon dioxide content comprises the following steps:
(1) cleaning magnesite: taking low-grade magnesite as a raw material, cleaning, and removing mud and micro-fine particle minerals on the surface of the magnesite for later use;
(2) grinding magnesite: grinding the magnesite cleaned in the step (1) to prepare mineral powder for later use;
(3) pulping of magnesite: adding water into the ground mineral powder in the step (2), uniformly mixing, and performing size mixing to prepare ore pulp for later use;
(4) flotation of magnesite: feeding the pulp prepared in the step (3) into flotation equipment for reverse flotation to prepare concentrate powder for later use;
(5) drying magnesite: and (4) adding water into the concentrate powder subjected to flotation in the step (4), cleaning and drying.
In the method for screening magnesite with low silicon dioxide content, the magnesium oxide content of the low-grade magnesite in the step (1) is 30% -44%, the silicon dioxide content is 1% -3%, and the calcium oxide content is 1% -3%.
In the screening method of the magnesite with low silicon dioxide content, the grinding equipment in the step (2) is a ball mill, and the rotating speed of the ball mill is 80 r/min; the grain size of the mineral powder in the step (2) is 0.1mm-0.3 mm.
In the method for screening magnesite with low silicon dioxide content, the weight ratio of the mineral powder to water in the step (3) is 1: 20; the stirring speed for uniform mixing in the step (3) is 1000rpm/min-1500 rpm/min; controlling the temperature of the size mixing in the step (3) to be 25 ℃; the solution for size mixing in the step (3) is sodium hydroxide or hydrochloric acid.
In the method for screening magnesite with low silicon dioxide content, the flotation device in the step (4) is a flotation tank, the flotation tank is divided into a dosing reaction zone, a standing aeration separation zone, a concentrate collecting tank, a tailing tank and a tailing collecting tank by a wall plate, the bottom surface of the dosing reaction zone is an inclined plane, one side of the flotation tank, which is close to the standing aeration separation zone, inclines downwards, the top of the dosing reaction zone is provided with an electric stirrer, the lower part of the outer side wall of the flotation tank is provided with an ore pulp inlet, the wall plate between the standing aeration separation zone and the dosing reaction zone is provided with a mixed ore pulp inlet, the lifting pump is connected through a pipeline, the bottom of the standing aeration separation zone is provided with a bubble generator, one side of the tailing tank, the top of the standing aeration separation zone is communicated with the concentrate, the upper part of the.
In the above-mentioned screening method for magnesite with low silica content,
the reverse flotation method in the step (4) comprises the following steps:
(A) roughing silicon: adding water, a collecting agent and an inhibitor into the ore pulp for reverse flotation roughing and filtering, wherein the pH value is adjusted to be 8, and the temperature is 25 ℃;
(B) silicon scavenging: adding water, collecting agent and inhibitor for scavenging and filtering, wherein the pH value is adjusted to 9, and the temperature is 40 ℃;
(C) roughing magnesium: adding water, collecting agent and inhibitor to perform reverse flotation roughing and filtering, wherein the pH value is adjusted to 10, and the temperature is 30 ℃;
(D) and (3) magnesium scavenging: adding water, collecting agent and inhibitor for scavenging and filtering, wherein the pH value is adjusted to 8, and the temperature is 20 ℃;
(E) and (3) re-flotation: and (D) performing the steps (A) - (D).
In the method for screening magnesite with low silicon dioxide content, the collecting agent for silicon roughing in the step (4) is a mixture of dodecylamine and water glass, wherein the weight ratio of the dodecylamine to the water glass is 2: 1; the inhibitor for silicon roughing in the step (4) is a mixture of sodium carbonate and sodium hexametaphosphate, wherein the weight ratio of the sodium carbonate to the sodium hexametaphosphate is 1: 3.
in the method for screening magnesite with low silicon dioxide content, the collecting agent for silicon scavenging in the step (4) is a mixture of dodecylamine and laurylamine, wherein the weight ratio of dodecylamine to laurylamine is 3: 2; the inhibitor for silicon scavenging in the step (4) is a mixture of allyloxyethanol and sodium hexametaphosphate, wherein the weight ratio of allyloxyethanol to sodium hexametaphosphate is 1: 4.
in the method for screening magnesite with low silicon dioxide content, the collecting agent for roughing magnesium in the step (4) is a mixture of dodecylamine and oxidized paraffin soap, wherein the weight ratio of the dodecylamine to the oxidized paraffin soap is 1: 1; the inhibitor for magnesium roughing in the step (4) is a mixture of acrylic acid maleic acid copolymer sodium salt and sodium hexametaphosphate, wherein the weight ratio of the acrylic acid maleic acid copolymer sodium salt to the sodium hexametaphosphate is 2: 3.
in the method for screening magnesite with low silicon dioxide content, the collector for magnesium scavenging in the step (4) is a mixture of dodecylamine and N-tetradecylamine ethanesulfonic acid, wherein the weight ratio of the dodecylamine to the N-tetradecylamine ethanesulfonic acid is 2: 1; the inhibitor for magnesium scavenging in the step (4) is a mixture of trimethylolpropane allyl ether and sodium hexametaphosphate, wherein the weight ratio of the trimethylolpropane allyl ether to the sodium hexametaphosphate is 3: 2.
3. advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
compared with the prior art, the concentrate powder prepared by the invention has good performance advantages, and the test parameters such as yield, magnesium oxide content, silicon dioxide content, calcium oxide content and the like show significant differences, and is high-quality concentrate powder. Specifically, magnesite ore of the invention is magnesite tailing with silicon dioxide content of about 3.0%, wherein silicon mainly exists in magnesite in different forms, the optimal grinding fineness is determined, and the selection and optimization of a collecting agent, an inhibitor and a pH value are carried out, so as to finally screen magnesite concentrate powder with low silicon dioxide.
Detailed Description
The invention is further described with reference to specific examples.
Example 1
The screening method of magnesite with low silicon dioxide content in the embodiment comprises the following steps:
(1) cleaning magnesite: taking low-grade magnesite as a raw material, cleaning, and removing mud and micro-fine particle minerals on the surface of the magnesite for later use;
(2) grinding magnesite: grinding the magnesite cleaned in the step (1) to prepare mineral powder for later use;
(3) pulping of magnesite: adding water into the ground mineral powder in the step (2), uniformly mixing, and performing size mixing to prepare ore pulp for later use;
(4) flotation of magnesite: feeding the pulp prepared in the step (3) into flotation equipment for reverse flotation to prepare concentrate powder for later use;
(5) drying magnesite: and (4) adding water into the concentrate powder subjected to flotation in the step (4), cleaning and drying.
In the method for screening magnesite with low silicon dioxide content, the magnesium oxide content of the low-grade magnesite in the step (1) is 40%, the silicon dioxide content is 2%, and the calcium oxide content is 2%.
In the screening method of the magnesite with low silicon dioxide content, the grinding equipment in the step (2) is a ball mill, and the rotating speed of the ball mill is 80 r/min; the size fraction of the mineral powder in the step (2) is 0.2 mm.
In the method for screening magnesite with low silicon dioxide content, the weight ratio of the mineral powder to water in the step (3) is 1: 20; the stirring speed for uniformly mixing in the step (3) is 1300 rpm/min; controlling the temperature of the size mixing in the step (3) to be 25 ℃; the solution for size mixing in the step (3) is sodium hydroxide or hydrochloric acid.
In the method for screening magnesite with low silicon dioxide content, the flotation device in the step (4) is a flotation tank, the flotation tank is divided into a dosing reaction zone, a standing aeration separation zone, a concentrate collecting tank, a tailing tank and a tailing collecting tank by a wall plate, the bottom surface of the dosing reaction zone is an inclined plane, one side of the flotation tank, which is close to the standing aeration separation zone, inclines downwards, the top of the dosing reaction zone is provided with an electric stirrer, the lower part of the outer side wall of the flotation tank is provided with an ore pulp inlet, the wall plate between the standing aeration separation zone and the dosing reaction zone is provided with a mixed ore pulp inlet, the lifting pump is connected through a pipeline, the bottom of the standing aeration separation zone is provided with a bubble generator, one side of the tailing tank, the top of the standing aeration separation zone is communicated with the concentrate, the upper part of the. This section is prior art to the present company, application No.: CN201521098716.6, publication No.: CN205436031U discloses a flotation device for low-grade magnesite, which comprises a flotation tank, wherein the flotation tank is divided into a dosing reaction area 1, a standing and aerating separation area 2, a concentrate collecting tank 3, a tailing tank 4 and a tailing collecting tank 5 by a wall plate, the bottom surface of the dosing reaction area 1 is an inclined surface, and one side of the dosing reaction area close to the standing and aerating separation area 2 is inclined downwards; the top of the dosing reaction zone 1 is provided with an electric stirrer 6, and the lower part of the outer side wall is provided with an ore pulp inlet 8; a mixed ore pulp inlet 12 is arranged on a wall plate between the standing aeration separation area 2 and the dosing reaction area 1 and is connected with a lift pump 15 through a pipeline, a bubble generator 14 is arranged at the bottom of the standing aeration separation area 2, and a tailing collecting device 17 is arranged at one side close to the tailing pond 4; the top of the standing aeration separation area 2 is communicated with a concentrate collecting tank 5, and the upper part of the communicated part is provided with a slag scraper 16; the top of the tailing pond 4 is communicated with a tailing collecting groove 5. The bubble generator 14 is connected with the water pump 10 through a first connecting pipeline 19, the water pump 10 is connected with the dosing reaction area 1 through a second connecting pipeline 20, an opening and closing valve 11 is arranged on the first connecting pipeline 19, and a filter 9 is arranged on the second connecting pipeline 20. The electric stirrer 6 is controlled by a variable frequency motor 7. A liquid level regulator 18 is arranged at the separation part of the tailing pond 4 and the tailing collecting groove 5. The tailing collecting device 17 is composed of a plurality of collecting pipes arranged side by side, the other ends of the collecting pipes extend into the tailing pond 4, and a plurality of through holes are uniformly formed in each collecting pipe along the radial direction and the axial direction. The bubble generators 14 are arranged side by side, liquid inlet pipes at the bottoms of the bubble generators 14 are fixed on the connecting main pipe 13, and the connecting main pipe 13 is communicated with the first connecting pipeline 19. When the chemical adding device is used, ore pulp enters the chemical adding reaction area 1 from the ore pulp inlet 8, the electric stirrer 6 is started, and flotation reagents such as a dispersing agent, a collecting agent, a pH value regulator and the like are respectively added in a stirring state, so that the flotation reagents and the ore pulp are fully mixed. The mixed ore pulp after adding the chemicals and mixing is sent into the standing aeration separation area 2 through the mixed ore pulp inlet 8 by the lifting pump 15, in the standing aeration separation area 2, the ore pulp fully reacts with the flotation reagents, and a plurality of bubble generators 14 at the bottom of the standing aeration separation area 2 generate a large amount of micro bubbles, so that the probability that the concentrate particles float to the liquid surface to form concentrate foam can be increased, and the improvement of the grade and the recovery rate of the concentrate is facilitated. The concentrate foam floating to the liquid surface is discharged to the concentrate collecting tank 3 by the slag scraper 16, and the tailings are collected to the tailing pond 4 by the tailing collecting device 17 and separated to the tailing separating tank 5, which are conventional processes and will not be described herein.
In the above-mentioned screening method for magnesite with low silica content,
the reverse flotation method in the step (4) comprises the following steps:
(A) roughing silicon: adding water, a collecting agent and an inhibitor into the ore pulp for reverse flotation roughing and filtering, wherein the pH value is adjusted to be 8, and the temperature is 25 ℃;
(B) silicon scavenging: adding water, collecting agent and inhibitor for scavenging and filtering, wherein the pH value is adjusted to 9, and the temperature is 40 ℃;
(C) roughing magnesium: adding water, collecting agent and inhibitor to perform reverse flotation roughing and filtering, wherein the pH value is adjusted to 10, and the temperature is 30 ℃;
(D) and (3) magnesium scavenging: adding water, collecting agent and inhibitor for scavenging and filtering, wherein the pH value is adjusted to 8, and the temperature is 20 ℃;
(E) and (3) re-flotation: and (D) performing the steps (A) - (D).
In the method for screening magnesite with low silicon dioxide content, the collecting agent for silicon roughing in the step (4) is a mixture of dodecylamine and water glass, wherein the weight ratio of the dodecylamine to the water glass is 2: 1; the inhibitor for silicon roughing in the step (4) is a mixture of sodium carbonate and sodium hexametaphosphate, wherein the weight ratio of the sodium carbonate to the sodium hexametaphosphate is 1: 3.
in the method for screening magnesite with low silicon dioxide content, the collecting agent for silicon scavenging in the step (4) is a mixture of dodecylamine and laurylamine, wherein the weight ratio of dodecylamine to laurylamine is 3: 2; the inhibitor for silicon scavenging in the step (4) is a mixture of allyloxyethanol and sodium hexametaphosphate, wherein the weight ratio of allyloxyethanol to sodium hexametaphosphate is 1: 4.
in the method for screening magnesite with low silicon dioxide content, the collecting agent for roughing magnesium in the step (4) is a mixture of dodecylamine and oxidized paraffin soap, wherein the weight ratio of the dodecylamine to the oxidized paraffin soap is 1: 1; the inhibitor for magnesium roughing in the step (4) is a mixture of acrylic acid maleic acid copolymer sodium salt and sodium hexametaphosphate, wherein the weight ratio of the acrylic acid maleic acid copolymer sodium salt to the sodium hexametaphosphate is 2: 3.
in the method for screening magnesite with low silicon dioxide content, the collector for magnesium scavenging in the step (4) is a mixture of dodecylamine and N-tetradecylamine ethanesulfonic acid, wherein the weight ratio of the dodecylamine to the N-tetradecylamine ethanesulfonic acid is 2: 1; the inhibitor for magnesium scavenging in the step (4) is a mixture of trimethylolpropane allyl ether and sodium hexametaphosphate, wherein the weight ratio of the trimethylolpropane allyl ether to the sodium hexametaphosphate is 3: 2.
comparative example 1
Chinese invention patent, application number: 201910668931.1, publication No.: CN110237937A, discloses a test method for realizing magnesite single-step reverse flotation desilication and decalcification, as described in example 1,
"step 1: preparation of mineral samples
Preparing magnesite, dolomite and quartz pure minerals, and blending the three minerals according to a certain proportion to prepare mixed ore; the particle size of the mixed ore is-0.106 +0.074 mm; the mixture ratio of the mixed ore is magnesite according to the mass ratio: dolomite: quartz 17: 2: 1;
step 2: size mixing
Putting the mixed mineral powder obtained in the step 1 into flotation equipment, adding 45mL of deionized water, uniformly mixing, and carrying out size mixing to obtain magnesite pulp;
and step 3: reverse flotation desilicication decalcification
At room temperature, firstly adding a NaOH aqueous solution with the mass fraction of 3% into the magnesite pulp, adjusting the pH value to 9, and then stirring for 3min until the pulp is uniform to obtain the magnesite pulp with the pH value of 9;
adding acetylacetone solution into magnesite pulp with pH value of 9, wherein the addition amount of the acetylacetone solution accounts for 6000mg/L of the magnesite pulp, and stirring for 3 min; adding dodecylamine with the addition amount accounting for 60mg/L of the magnesite pulp, stirring for 3min, and finally performing reverse flotation for 3min to obtain the low-silicon low-calcium magnesite concentrate. In the test process, the rotating speed of the flotation machine is set to be 1920 r/min'.
Comparative example 2
Chinese invention patent, application number: 201110027831.4, publication No.: CN102189040B discloses a step flotation method of high-silicon high-calcium low-grade magnesite, as described in example 1, "the raw material of high-silicon high-calcium low-grade magnesite contains 43.08% by weight of MgO and SiO2 2.29％，CaO 4.75％，FeO 0.12％，Al2O3 0.07％；
Ball-milling high-silicon high-calcium low-grade magnesite until the part with the fineness less than 0.074mm accounts for 70% of the total weight of all the materials, and then adding water to prepare raw ore pulp with the weight concentration of 20%;
placing the raw ore pulp into flotation equipment, adding a collecting agent of dodecylamine and stirring for 3min under the condition of stirring speed of 1600rpm, wherein the adding amount of dodecylamine is 100g/t of the raw ore pulp, adding pine oil and stirring for 60s, the adding amount of pine oil is 10g/t of the raw ore pulp, then carrying out reverse flotation and rough separation for 4min, and separating out the SiO-containing raw ore pulp2The tailings of (2); coarse flotationCarrying out reverse flotation concentration on the obtained raw ore concentrate for 2 times to obtain desilicated ores, adding a collecting agent dodecylamine when carrying out the primary reverse flotation concentration, stirring for 3min at the stirring speed of 1600rpm, then carrying out the reverse flotation concentration for 2min, adding the collecting agent dodecylamine when carrying out the secondary reverse flotation concentration, stirring for 3min at the stirring speed of 1600rpm, and then carrying out the reverse flotation concentration for 2min, wherein the adding amount of the dodecylamine is 25g/t of the raw ore concentrate when carrying out the reverse flotation concentration each time;
adding water into desiliconized ore to prepare desiliconized ore pulp with 20% of weight concentration, and then adding Na2CO3Adjusting the pH value of the desiliconized ore pulp to 10, firstly adding inhibitor water glass and stirring for 3min under the condition of stirring speed of 1600rpm, wherein the adding amount of the water glass is 800g/t of the desiliconized ore pulp, then adding the inhibitor sodium hexametaphosphate and stirring for 3min, the adding amount of the sodium hexametaphosphate is 100g/t of the desiliconized ore pulp, then adding the collector RA715 and stirring for 3min, the adding amount of the RA715 is 800g/t of the desiliconized ore pulp, then carrying out 3min positive flotation roughing, and sorting tailings containing CaO; carrying out 2 times of positive flotation concentration on the desiliconized concentrate obtained by the positive flotation roughing, wherein the time of the first positive flotation concentration is 3min, and the time of the second positive flotation concentration is 2min, so as to obtain the magnesite concentrate, the main components of which comprise, by weight, 47.10% of MgO, 20.30% of SiO and 0.76% of CaO;
mixing the tailings obtained by the primary reverse flotation concentration with raw ore pulp added with an inhibitor, a collecting agent and a foaming agent to perform reverse flotation roughing, mixing the tailings obtained by the secondary reverse flotation concentration with concentrate obtained by the reverse flotation roughing added with the collecting agent to perform primary reverse flotation concentration;
and mixing the tailings obtained by the primary direct flotation concentration with desilication ore pulp added with an inhibitor and a collector for carrying out direct flotation roughing, and mixing the tailings obtained by the secondary direct flotation concentration with the concentrate obtained by the direct flotation roughing for carrying out primary direct flotation concentration.
Comparative example 3
Chinese invention patent, application number: 201310521557.5, publication No.: CN103537380B discloses a magnesite ore reverse flotation concentrated tailing recleaning method, as described in the specific implementation mode, the magnesite ore reverse flotation concentrated tailing recleaning method comprises the steps of grinding 71-73% of magnesite ore to-0.074 mm, placing the ground ore powder in a flotation machine, adding 140-150g/t sodium hexametaphosphate and 500g/t water glass, stirring for 5-6min, adding 1200g/t hydrochloric acid and 80-90g/t amine collecting agent, adjusting the pH value of the ore pulp to 5.5-6, starting flotation, and obtaining rough concentrated ore, wherein the concentration mass percentage of the ore pulp in the flotation machine is 31-33%; adding 320g/t hydrochloric acid 300 and 35-45g/t amine collecting agent into the rough concentration, adjusting the pH value of ore pulp to 5.5-6, and performing flotation for 5-6min to obtain primary fine concentration concentrate; adding 220g/t hydrochloric acid and 25-35g/t amine collecting agent into the primary concentrated concentrate, and performing reverse flotation for 5-6min to obtain secondary concentrated concentrate; and re-selecting the secondary fine tailings without adding any medicament, and performing air flotation for 2-4 min. The recleaning concentrate and the secondary concentrating concentrate are combined to be used as the total concentrate. The second concentration tailings, the first concentration tailings and the roughing tailings are combined to be used as total tailings ".
Comparative example 4
Chinese invention patent, application number: 201810440690.0, publication No.: CN108654846A discloses a process for solving water imbalance of magnesite direct and reverse flotation by using a dehydration method, and as described in the specific implementation manner, "a process for solving water imbalance of magnesite direct and reverse flotation by using a dehydration method specifically comprises the following steps: the method comprises the following steps: crushing and screening low-grade magnesite, and quantitatively and uniformly inputting ore materials with the granularity of less than-10 mm into a ball mill for grinding;
step two: returning the materials with the granularity of more than 200 meshes to the ball mill for continuous grinding until 75 percent of the materials are below 200 meshes, and then adding a reverse flotation reagent 1 for a reverse flotation silicon removal process to obtain a foam product as final tailings 1;
and step three, adding the direct flotation circulating water and the direct flotation reagent 2 after the reverse flotation concentrate pulp is dehydrated, performing a direct flotation calcium removal process, returning the removed water to the reverse flotation for recycling, wherein the foam product is the final concentrate pulp, the dehydrated concentrate is high-quality magnesite concentrate, the water is returned to the direct flotation for recycling, and the tailings are the final tailings 2.
Preferably, in the second step, the reverse flotation reagent 1 comprises the following components in percentage by mass: 15-20% of polyether polyol, 5-10% of foam regulator, 10-20% of monoamine, 20-30% of diamine and 40-60% of polyamine.
Further preferably, in the second step, the reverse flotation reagent 1 comprises the following components in percentage by mass: 15% of polyether polyol, 8% of foam regulator, 12% of monoamine, 25% of diamine and 40% of polyamine.
Preferably, the positive flotation reagent 2 in the third step comprises the following components in percentage by mass: 75-85% of oleic acid, 8-15% of fatty acid polyoxyethylene ether emulsifier and 8-15% of sulfonated fatty acid.
Further preferably, the positive flotation agent 2 in the third step comprises the following components in percentage by mass: oleic acid 80%, fatty acid polyoxyethylene ether emulsifier 10% and sulfonated fatty acid 10% ".
Comparative example 5
Chinese invention patent, application number: 201210277468.6, publication No.: CN102773169B, which discloses a collector for removing iron in reverse flotation desilication of magnesite ore and a preparation method thereof, as described in the specific embodiment, "the collector for removing iron in reverse flotation desilication of magnesite ore comprises the following chemical components by mass percent:
52% of dodecylamine; 18% of glacial acetic acid; octanol 22%; 8 percent of thiourethane, and all the components adopt industrial chemicals.
Preparing materials according to the component content given by the collecting agent for removing iron in the reverse flotation desilication of the magnesite ore, firstly dissolving dodecylamine in glacial acetic acid, and stirring and dissolving for 5-10 min at the temperature of 20-40 ℃; adding octanol to improve molecular association components in the compound, and stirring for 3-5 min; and finally adding thiourethane, and stirring for 3-5 min.
The invention provides a collecting agent laboratory application example for realizing iron removal in reverse flotation desilication of magnesite ore:
magnesite ore is obtained from a Haicheng magnesite refractory material general factory, the content of impurity Fe2O3 is detected to be 0.50%, after the ore sample is ground by a ball mill, the content of Fe2O3 is 0.65% (polluted by grinding medium), the granularity is-200 to 75%, and the reverse flotation process is a one-coarse two-fine open flotation process. The flotation experiment is carried out on an XFD type hanging groove type flotation machine, 400g of ore sample is floated every time, and the water adding amount is 900 mL. Under the environment of pH 5.5, 1500g/t of inhibitor regulator water glass and 150g/t of sodium hexametaphosphate are added and stirred for 5min, and 120g/t of collecting agent of the invention is added and stirred for 3 min. The stirring speed of the flotation machine is 1800r/min, and the flotation time is 15min ".
Example 2
The concentrate powder prepared in example 2 and the concentrate powders prepared in comparative examples 1 to 5 were selected and analyzed for yield, content of magnesium oxide, content of silicon dioxide, and content of calcium oxide, respectively.
TABLE 1 comparison of the test parameters
Compared with comparative examples 1-5, the concentrate powder prepared in example 1 of the present invention has good performance advantages, and the test parameters such as yield, magnesia content, silica content, calcium oxide content, etc. all show significant differences, and is a high quality concentrate powder. Specifically, magnesite ore of the invention is magnesite tailing with silicon dioxide content of about 3.0%, wherein silicon mainly exists in magnesite in different forms, the optimal grinding fineness is determined, and the selection and optimization of a collecting agent, an inhibitor and a pH value are carried out, so as to finally screen magnesite concentrate powder with low silicon dioxide.
Example 3
Project prospective prospect:
the project adopts low-grade magnesite to produce low SiO2The magnesite concentrate powder is subjected to technical attack and industrial test through the project. So that the concentrate powder can reach SiO stably in industrial batch2The product reaches the domestic advanced level, 50 million tons of low-grade magnesite can be consumed every year after the product is applied to the production of a company, the pollution damage of tailings to the environment is eliminated, the natural ecological environment is improved, and simultaneously 30 million tons of low SiO can be produced every year by applying the project2Magnesite concentrate powder.
The present invention and its embodiments have been described in an illustrative manner, and the description is not intended to be limiting, and the embodiments of the present invention are shown in the drawings and are not intended to limit the actual structure. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.
Claims (10)
1. A method for screening magnesite with low silicon dioxide content is characterized by comprising the following steps:
(1) cleaning magnesite: taking low-grade magnesite as a raw material, cleaning, and removing mud and micro-fine particle minerals on the surface of the magnesite for later use;
(2) grinding magnesite: grinding the magnesite cleaned in the step (1) to prepare mineral powder for later use;
(3) pulping of magnesite: adding water into the ground mineral powder in the step (2), uniformly mixing, and performing size mixing to prepare ore pulp for later use;
(4) flotation of magnesite: feeding the pulp prepared in the step (3) into flotation equipment for reverse flotation to prepare concentrate powder for later use;
(5) drying magnesite: and (4) adding water into the concentrate powder subjected to flotation in the step (4), cleaning and drying.
2. A method for screening magnesite with low content of silicon dioxide as claimed in claim 1, which is characterized in that,
in the low-grade magnesite obtained in the step (1), the content of magnesium oxide is 30% -44%, the content of silicon dioxide is 1% -3%, and the content of calcium oxide is 1% -3%.
3. A method for screening magnesite with low content of silicon dioxide as claimed in claim 1, which is characterized in that,
the grinding equipment in the step (2) is a ball mill, and the rotating speed of the ball mill is 80 r/min;
the grain size of the mineral powder in the step (2) is 0.1mm-0.3 mm.
4. A method for screening magnesite with low content of silicon dioxide as claimed in claim 1, which is characterized in that,
the weight ratio of the mineral powder to the water in the step (3) is 1: 20;
the stirring speed for uniform mixing in the step (3) is 1000rpm/min-1500 rpm/min;
controlling the temperature of the size mixing in the step (3) to be 25 ℃;
the solution for size mixing in the step (3) is sodium hydroxide or hydrochloric acid.
5. A method for screening magnesite with low content of silicon dioxide as claimed in claim 1, which is characterized in that,
the flotation equipment in the step (4) is a flotation tank, the flotation tank is divided into a dosing reaction zone, a standing aeration separation zone, a concentrate collecting tank, a tailing tank and a tailing collecting tank by a wall plate, the bottom surface of the dosing reaction zone is an inclined plane, one side of the dosing reaction zone close to the standing aeration separation zone inclines downwards, an electric stirrer is arranged at the top of the dosing reaction zone, an ore pulp inlet is arranged at the lower part of the outer side wall, a mixed ore pulp inlet is arranged on the wall plate between the standing aeration separation zone and the dosing reaction zone, the wall plate is connected with a lifting pump through a pipeline, a bubble generator is arranged at the bottom of the standing aeration separation zone, a tailing collecting device is arranged at one side close to the tailing tank, the top of the standing aeration separation zone is communicated with the.
6. A method for screening magnesite with low content of silicon dioxide as claimed in claim 1, which is characterized in that,
the reverse flotation method in the step (4) comprises the following steps:
(A) roughing silicon: adding water, a collecting agent and an inhibitor into the ore pulp for reverse flotation roughing and filtering, wherein the pH value is adjusted to be 8, and the temperature is 25 ℃;
(B) silicon scavenging: adding water, collecting agent and inhibitor for scavenging and filtering, wherein the pH value is adjusted to 9, and the temperature is 40 ℃;
(C) roughing magnesium: adding water, collecting agent and inhibitor to perform reverse flotation roughing and filtering, wherein the pH value is adjusted to 10, and the temperature is 30 ℃;
(D) and (3) magnesium scavenging: adding water, collecting agent and inhibitor for scavenging and filtering, wherein the pH value is adjusted to 8, and the temperature is 20 ℃;
(E) and (3) re-flotation: and (D) performing the steps (A) - (D).
7. A method for screening magnesite with low content of silicon dioxide as claimed in claim 1, which is characterized in that,
the collecting agent for silicon roughing in the step (4) is a mixture of dodecylamine and water glass, wherein the weight ratio of the dodecylamine to the water glass is 2: 1;
the inhibitor for silicon roughing in the step (4) is a mixture of sodium carbonate and sodium hexametaphosphate, wherein the weight ratio of the sodium carbonate to the sodium hexametaphosphate is 1: 3.
8. a method for screening magnesite with low content of silicon dioxide as claimed in claim 1, which is characterized in that,
the collecting agent for silicon scavenging in the step (4) is a mixture of dodecylamine and laurylamine, wherein the weight ratio of the dodecylamine to the laurylamine is 3: 2;
the inhibitor for silicon scavenging in the step (4) is a mixture of allyloxyethanol and sodium hexametaphosphate, wherein the weight ratio of allyloxyethanol to sodium hexametaphosphate is 1: 4.
9. a method for screening magnesite with low content of silicon dioxide as claimed in claim 1, which is characterized in that,
the collecting agent for magnesium roughing in the step (4) is a mixture of dodecylamine and oxidized paraffin soap, wherein the weight ratio of the dodecylamine to the oxidized paraffin soap is 1: 1;
the inhibitor for magnesium roughing in the step (4) is a mixture of acrylic acid maleic acid copolymer sodium salt and sodium hexametaphosphate, wherein the weight ratio of the acrylic acid maleic acid copolymer sodium salt to the sodium hexametaphosphate is 2: 3.
10. a method for screening magnesite with low content of silicon dioxide as claimed in claim 1, which is characterized in that,
the collecting agent for magnesium scavenging in the step (4) is a mixture of dodecylamine and N-tetradecylamine ethanesulfonic acid, wherein the weight ratio of the dodecylamine to the N-tetradecylamine ethanesulfonic acid is 2: 1;
the inhibitor for magnesium scavenging in the step (4) is a mixture of trimethylolpropane allyl ether and sodium hexametaphosphate, wherein
The weight ratio of the trimethylolpropane allyl ether to the sodium hexametaphosphate is 3: 2.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104289318A (en) * | 2014-08-21 | 2015-01-21 | 营口东吉科技（集团）有限公司 | Desilication agent and method used for magnesite reverse flotation |
| CN104437883A (en) * | 2014-11-13 | 2015-03-25 | 中蓝连海设计研究院 | Digestion-desliming-reverse floatation method for treatment of low-grade magnesite high in silicon content and calcium content |
| AU2015202371A1 (en) * | 2008-10-28 | 2015-05-21 | Xyleco, Inc. | Processing materials |
| CN205436031U (en) * | 2015-12-25 | 2016-08-10 | 辽宁东和新材料股份有限公司 | Low -grade floatation device for magnesite |
| CN107427841A (en) * | 2014-12-30 | 2017-12-01 | 凯米罗总公司 | The inhibitor of ore floatation |
| CN110237937A (en) * | 2019-07-24 | 2019-09-17 | 福州大学 | A kind of test method for realizing magnesite single step Counterfloatating desiliconization decalcification |
| CN111036411A (en) * | 2019-11-27 | 2020-04-21 | 东北大学 | Application of inhibitor acrylic acid maleic acid copolymer sodium salt in flotation and demagging of phosphate ore |
-
2020
- 2020-08-10 CN CN202010795172.8A patent/CN112221715A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2015202371A1 (en) * | 2008-10-28 | 2015-05-21 | Xyleco, Inc. | Processing materials |
| CN104289318A (en) * | 2014-08-21 | 2015-01-21 | 营口东吉科技（集团）有限公司 | Desilication agent and method used for magnesite reverse flotation |
| CN104437883A (en) * | 2014-11-13 | 2015-03-25 | 中蓝连海设计研究院 | Digestion-desliming-reverse floatation method for treatment of low-grade magnesite high in silicon content and calcium content |
| CN107427841A (en) * | 2014-12-30 | 2017-12-01 | 凯米罗总公司 | The inhibitor of ore floatation |
| CN205436031U (en) * | 2015-12-25 | 2016-08-10 | 辽宁东和新材料股份有限公司 | Low -grade floatation device for magnesite |
| CN110237937A (en) * | 2019-07-24 | 2019-09-17 | 福州大学 | A kind of test method for realizing magnesite single step Counterfloatating desiliconization decalcification |
| CN111036411A (en) * | 2019-11-27 | 2020-04-21 | 东北大学 | Application of inhibitor acrylic acid maleic acid copolymer sodium salt in flotation and demagging of phosphate ore |
Non-Patent Citations (1)
| Title |
|---|
| 全国工业表面活性剂生产技术协作组，全国工业表面活性剂中心: "《2000工业表面活性剂技术经济文集》", 31 October 2000, 大连出版社 * |
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