CN113414009B - Flotation method for crude ore containing filler specularite - Google Patents
Flotation method for crude ore containing filler specularite Download PDFInfo
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- CN113414009B CN113414009B CN202110553405.8A CN202110553405A CN113414009B CN 113414009 B CN113414009 B CN 113414009B CN 202110553405 A CN202110553405 A CN 202110553405A CN 113414009 B CN113414009 B CN 113414009B
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- flotation
- sodium carbonate
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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
- B03D1/002—Inorganic 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
- B03D2201/007—Modifying reagents for adjusting pH or conductivity
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a flotation method for a crude ore containing a filling body specularite, which comprises the following steps: (1) carrying out flotation feeding; (2) Adding a regulator, and sequentially adding a sodium hydroxide solution, a starch agent, a sodium carbonate solution and a collecting agent into the ore pulp; (3) And (4) performing rough concentration, namely performing rough concentration on the ore pulp added with the regulator to obtain concentrate and tailings. The method has low input cost, and the sodium carbonate replaces lime milk to be used as the regulator, so that the unit consumption of the collecting agent and the sodium hydroxide medicament can be effectively reduced, and the cost is saved; the stability of flotation foam can be improved, and the flotation operation is easy to adjust; the lime milk as the original regulator is easy to precipitate and block pipelines, and the invention uses sodium carbonate to avoid the problem and reduce the workload.
Description
Technical Field
The invention relates to the technical field of mineral flotation, in particular to a flotation method for a crude ore containing a filling body specularite.
Background
In recent years, the hematite dressing technology is developed rapidly, the reverse flotation process is an effective method for obtaining high-quality concentrate from fine-grained embedded iron ore, and a combined flow taking anion reverse flotation as a core becomes the mainstream of hematite dressing. Currently, reverse flotation of iron ore is mainly used for flotation of gangue minerals, and gangue minerals of iron ore are mainly silicate minerals (quartz). The anion collecting agent mainly refers to a compound with bonding atoms being oxygen atoms instead of divalent sulfur, and comprises higher fatty acid and sodium salt thereof, wherein oleic acid, sodium oleate, oxidized paraffin oil, petroleum sodium sulfonate and the like are most commonly used in the industrial flotation process at present. When anionic collectors are used, activation of the high-valent metal cations is required for most silicate minerals. For example, the activation of iron, calcium, magnesium, lead, copper and other ions is very critical in the ore grinding process. In addition, when an inorganic anion regulator and a low-component organic complexing regulator are selected, the selectivity of activation control is very important, and only when the combination of the two factors is optimized, the anion collector can obtain good separation selectivity. At present, regulators adopted in the reverse flotation of iron ores mainly comprise a pH regulator sodium hydroxide, an inhibitor starch and an activator lime milk. The invention provides a flotation method for a crude ore containing a filler specularite, which can solve the problems.
Disclosure of Invention
The invention aims to provide a flotation method for a crude ore containing a filling body specularite, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a flotation method for a raw ore containing a filler specularite comprises the following steps:
(1) Carrying out flotation feeding;
(2) Adding a regulator, and sequentially adding a sodium hydroxide solution, a starch agent, a sodium carbonate solution and a collecting agent into the ore pulp;
(3) And (4) performing rough concentration, namely performing rough concentration on the ore pulp added with the regulator to obtain concentrate and tailings.
As a preferred technical scheme of the invention, the method for detecting the calcium ion concentration of the flotation feeding ore pulp comprises the following steps: taking 300ml of flotation feed ore pulp into a 500ml beaker, standing and taking 100ml of supernatant liquid into a 250ml conical flask, if a water sample is opaque and needs to be filtered, adding 3ml of ammonium chloride (PH = 10) buffer solution and 2 drops of 5% chrome black T indicator, titrating the solution to the end point of changing from wine red to blue by using 0.010mol/L EDTA standard solution under the condition of continuously shaking, and recording the use volume V of the EDTA standard solution;
the calcium ion concentration of the flotation feed ore pulp is calculated according to the following formula:
C(Ca 2+ )＝C*V*1000/vs(mmol/L)；
C-EDTA standard solution concentration mol/L (EDTA);
v-volume ml of EDTA standard solution consumed during titration;
vs-water sample volume ml;
the calcium ion concentration of the flotation feeding ore pulp is not less than 1.0mmol/L.
As a preferred technical scheme of the invention, the amount of the sodium carbonate solution is in positive correlation with the calcium ion concentration of the flotation feed pulp, and the amount of the sodium carbonate is calculated according to the following formula:
V(Na 2 CO 3 )＝V 1 *(C(Ca 2+ )-1)*0.106/0.075(L/h)；
V 1 flotation feed pulp flow (m) 3 /h)。
As a preferred technical scheme of the present invention, the sodium carbonate solution is continuously added, and the flow rate of sodium carbonate added per minute is as follows:
V 2 ＝V(Na 2 CO 3 )/60(L/min)。
part of filling bodies are mixed in two-step specularite raw ores after the sublevel open stoping subsequent filling, and the mixture enters an ore dressing process system. The pack can cause the following problems to the flotation process system:
1. the surface of the quartz activated by Ca < 2+ > in the conventional specularite reverse flotation is positively charged, and then the fatty acid collecting agent is used for collecting so as to improve the concentrate grade. The filling body is composed of ettringite, cementing powder and tailings. A large amount of Ca < 2+ > and excessive Ca < 2+ > contained in a flotation and sorting system can consume a large amount of collecting agents, so that quartz does not have enough fatty acid collecting agents to collect, and the grade of iron ore concentrate is reduced. The Critical Micelle Concentration (CMC) of the collector may be exceeded if the amount of the collector is increased; the collector selectivity is destroyed, again resulting in a reduction in iron concentrate grade and an increase in tailings grade.
2. The specularite has fine embedded particle size, so the dissociation of the monomers needs to be realizedThe fine grinding is carried out, but the fine grinding can cause the high viscosity of the specularite pulp, the difficult dispersion and the serious argillization of the pulp. Under alkaline conditions, ca 2+ Can destroy the dispersion state of minerals, ca 2+ The negative value of the fine-grained surface potential is gradually reduced, and the electric double-layer repulsion force among the particles is reduced, so that the particles are easier to mutually coagulate and agglomerate. Ca 2+ There is a promotion of non-selective flocculation behaviour of the particles and the higher the ion concentration, the stronger the non-selective flocculation. Excess of Ca 2+ The non-selective flocculation is triggered to tightly connect iron and quartz, and the collecting agent cannot selectively collect iron from the generated non-selective flocs, so that the loss of metal quantity is caused.
Aiming at the flotation process of raw ore mixed with a filling body, sodium carbonate is used as a new regulator to replace raw lime milk. Sodium carbonate is a strong alkali weak acid salt, and can generate ionization and hydrolysis reaction in aqueous solution to generate CO 3 2 -and HCO 3 2 To make the solution alkaline and have a certain pH buffering capacity. Carbonate ions and calcium ions in the ore pulp are subjected to electrostatic adsorption to generate carbonate precipitates, and the concentration of the calcium ions in the solution is reduced. Sodium carbonate is also a good dispersant, and can better disperse gangue slimes. The reason for this is the negatively charged Na in the solution 2 CO 3 The charge can be adsorbed on the surface of the mineral, so that the electronegativity of the surface of the mineral is increased, the electrostatic repulsion force among mineral particles is increased, and the effect of dispersing the fine-particle-grade mineral particles is achieved. Iron and quartz are effectively separated, and the selectivity of the collecting agent is improved on the side surface. Meanwhile, the addition of sodium carbonate can obviously improve the stability of the flotation three-phase foam layer, and the pH value of ore pulp is better than that of sodium hydroxide when the pH value of the ore pulp is adjusted by the fatty acid flotation quartz sodium carbonate under the alkaline condition. When the pH value is 10.5, the floatability of quartz can be improved by sodium carbonate, and the flotation recovery rate of specularite can be obviously improved by increasing the use amount of the sodium carbonate.
Compared with the prior art, the invention has the beneficial effects that: according to the flotation method for the crude ore containing the mineral of the specularite as the filling body, industrial application shows that indexes of 66.32% of grade of flotation concentrate and 85.63% of recovery rate can be obtained on site; the investment cost is low, and the sodium carbonate is used as a regulator instead of lime milk, so that the unit consumption of a collecting agent and a sodium hydroxide agent can be effectively reduced, and the cost is saved; the stability of flotation foam can be improved, and the flotation operation is easy to adjust; the lime milk as the original regulator is easy to precipitate and block pipelines, and the invention uses sodium carbonate to avoid the problem and reduce the workload.
Drawings
FIG. 1: the steps of the method are shown schematically;
FIG. 2: the invention is a test flow chart;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a flotation method for a crude ore containing a filling body specularite, which comprises the following steps:
(1) Carrying out flotation feeding;
(2) Adding a regulator, and sequentially adding a sodium hydroxide solution, a starch agent, a sodium carbonate solution and a collecting agent into the ore pulp;
(3) And (4) performing rough concentration, namely performing rough concentration on the ore pulp added with the regulator to obtain concentrate and tailings.
The method for detecting the calcium ion concentration of the flotation feeding ore pulp comprises the following steps: placing 300ml of flotation feed ore pulp in a 500ml beaker, standing and taking 100ml of supernatant in a 250ml conical flask, if the water sample is not transparent, filtering, adding 3ml of ammonium chloride (PH = 10) buffer solution and 2 drops of 5% chrome black T indicator, titrating the solution by using 0.010mol/L EDTA standard solution under continuous shaking until the solution is changed from wine red to blue, and recording the use volume V of the EDTA standard solution;
the calcium ion concentration of the flotation feed ore pulp is calculated according to the following formula:
C(Ca 2+ )＝C*V*1000/vs(mmol/L)；
C-EDTA standard solution concentration mol/L (EDTA);
v-volume ml of EDTA standard solution consumed during titration;
vs-water sample volume ml;
the calcium ion concentration of the flotation feeding ore pulp is not less than 1.0mmol/L.
The amount of the sodium carbonate solution is positively correlated with the calcium ion concentration of the flotation ore feeding pulp, and the amount of the sodium carbonate is calculated according to the following formula:
V(Na 2 CO 3 )＝V 1 *(C(Ca 2+ )-1)*0.106/0.075(L/h)；
V 1 flotation feed pulp flow (m) 3 /h)。
The sodium carbonate solution is continuously added, and the sodium carbonate adding flow per minute is as follows:
V 2 ＝V(Na 2 CO 3 )/60(L/min)。
specifically, aiming at the raw ore flotation process mixed with the filling body, sodium carbonate is used as a new regulator to replace raw lime milk. Sodium carbonate is a strong alkali weak acid salt, and can generate ionization and hydrolysis reaction in aqueous solution to generate CO 3 2 -and HCO 3 2 The solution is made alkaline and has a certain pH buffer capacity. Carbonate ions and calcium ions in the ore pulp are subjected to electrostatic adsorption to generate carbonate precipitates, and the concentration of the calcium ions in the solution is reduced. Sodium carbonate is also a good dispersant, and can better disperse gangue slimes. The reason for this is the negative Na in the solution 2 CO 3 The load can be adsorbed on the surface of the mineral, so that the electronegativity of the surface of the mineral is increased, the electrostatic repulsion force among mineral particles is increased, and the effect of dispersing the mineral particles in the fine particle fraction is achieved. Iron and quartz are effectively separated, and the selectivity of the collecting agent is improved on the side surface. Meanwhile, the addition of sodium carbonate can obviously improve the stability of the flotation three-phase foam layer, and the pH value of ore pulp is better than that of sodium hydroxide when the pH value of the ore pulp is adjusted by the fatty acid flotation quartz sodium carbonate under the alkaline condition. When the pH value is 10.5, the floatability of quartz can be improved by sodium carbonate, and the flotation recovery rate of specularite can be obviously improved by increasing the use amount of the sodium carbonate; the original conventional flotation process reagent can not ensure the grade of the external-sale products of the flotation iron concentrates aiming at the raw ores mixed in the filling body.
When sodium carbonate and lime are used as regulators in the flotation, a laboratory closed circuit verification test is carried out, the dosage of a roughing medicament is 1200g/t of sodium hydroxide, 600g/t of starch, 750g/t of TA-19 collecting agent, and the dosage of a concentrating TA-19 is 300g/t, the test flow is shown in figure 2, and the test results are shown in table 1;
TABLE 1 closed-loop test results
Closed-loop test results show that under the condition that 300g/t of sodium carbonate is used as a regulator, the separation index of 66.89% of concentrate grade and 90.79% of recovery rate can be achieved, and under the condition that 300g/t of lime is used as a regulator, the separation index of 63.72% of concentrate grade, 86.12% of recovery rate, low concentrate grade and low metal recovery rate are achieved.
During the industrial application test, the concentration of the calcium ions in the ore pulp lasts for 1.8mmol/L. The lime regulator (ratio 7.5%) is completely stopped, sodium carbonate is used as the regulator (ratio 7.5%), and the flotation index comparison condition is shown in the following table 2 under the condition that the ore feeding conditions are basically consistent.
TABLE 2 comparison table of flotation indexes in industrial test
The industrial application test shows that the industrial application of the invention shows that the indexes of 66.32 percent of flotation concentrate grade and 85.63 percent of recovery rate can be obtained on site;
the method has low investment cost, and the sodium carbonate replaces lime milk to be used as the regulator, so that the unit consumption of the collecting agent and the sodium hydroxide agent can be effectively reduced, and the cost is saved;
the invention can improve the stability of flotation foam and is easy to adjust the flotation operation;
the lime milk as the original regulator is easy to precipitate and block pipelines, and the invention uses sodium carbonate to avoid the problem and reduce the workload.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (1)
1. A flotation method for a raw ore containing a filler specularite is characterized by comprising the following steps:
(1) Carrying out flotation feeding;
(2) Adding a regulator, and sequentially adding a sodium hydroxide solution, a starch agent, a sodium carbonate solution and a collecting agent into the ore pulp;
(3) Roughing, namely roughing the ore pulp added with the regulator to obtain concentrate and tailings;
the method for detecting the calcium ion concentration of the flotation feeding ore pulp comprises the following steps: placing 300ml of flotation feed ore pulp in a 500ml beaker, standing and taking 100ml of supernatant in a 250ml conical flask, if the water sample is not transparent, filtering, adding 3ml of ammonium chloride (PH = 10) buffer solution and 2 drops of 5% chrome black T indicator, titrating the solution by using 0.010mol/L EDTA standard solution under continuous shaking until the solution is changed from wine red to blue, and recording the use volume V of the EDTA standard solution;
the calcium ion concentration of the flotation feeding ore pulp is calculated according to the following formula:
C(Ca 2+ )＝C*V*1000/vs(mmol/L)；
C-EDTA standard solution concentration mol/L (EDTA);
v-volume ml of EDTA standard solution consumed during titration;
vs is the volume ml of the water sample;
the concentration of calcium ions in the flotation feed ore pulp is not less than 1.0mmol/L;
the amount of the sodium carbonate solution is positively correlated with the calcium ion concentration of the flotation ore feeding pulp, and the sodium carbonate addition amount is calculated according to the following formula:
V(Na 2 CO 3 )＝V 1 *(C(Ca 2+ )-1)*0.106/0.075(L/h)；
V 1 flotation feed pulp flow (m) 3 /h)；
The sodium carbonate solution is continuously added, and the sodium carbonate adding flow per minute is as follows:
V 2 ＝V(Na 2 CO 3 )/60(L/min)。
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4229287A (en) * | 1978-12-04 | 1980-10-21 | Engelhard Minerals & Chemicals Corporation | Tin flotation |
| CN102688806A (en) * | 2012-06-06 | 2012-09-26 | 鞍钢集团矿业公司 | Dispersed flotation separation method for carbonate-containing iron ore |
| CN104998759A (en) * | 2015-07-29 | 2015-10-28 | 昆明理工大学 | Combined reagent for reverse flotation of microgranular iron ore magnetic concentrate and application method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7516849B2 (en) * | 2007-02-21 | 2009-04-14 | Arr-Maz Custom Chemicals, Inc. | Froth flotation process with pH modification |
| CN101693222A (en) * | 2009-11-02 | 2010-04-14 | 贵州大学 | Method for separating oolitic hematite |
| CN103567076A (en) * | 2013-11-11 | 2014-02-12 | 广州有色金属研究院 | Beneficiation method of micro-fine particle limonite |
| CN107907536A (en) * | 2017-12-15 | 2018-04-13 | 大工（青岛）新能源材料技术研究院有限公司 | A kind of improved method of EDTA titration measurings calcium content |
| CN108444929A (en) * | 2018-04-27 | 2018-08-24 | 长春黄金研究院有限公司 | The assay method of lead content in a kind of polymetallic ore |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4229287A (en) * | 1978-12-04 | 1980-10-21 | Engelhard Minerals & Chemicals Corporation | Tin flotation |
| CN102688806A (en) * | 2012-06-06 | 2012-09-26 | 鞍钢集团矿业公司 | Dispersed flotation separation method for carbonate-containing iron ore |
| CN104998759A (en) * | 2015-07-29 | 2015-10-28 | 昆明理工大学 | Combined reagent for reverse flotation of microgranular iron ore magnetic concentrate and application method thereof |
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