CN110899000B - Application of combined collecting agent for magnesite flotation decalcification - Google Patents
Application of combined collecting agent for magnesite flotation decalcification Download PDFInfo
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- CN110899000B CN110899000B CN201911030591.6A CN201911030591A CN110899000B CN 110899000 B CN110899000 B CN 110899000B CN 201911030591 A CN201911030591 A CN 201911030591A CN 110899000 B CN110899000 B CN 110899000B
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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
- B03D2201/007—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
- 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
- B03D2203/00—Specified materials treated by the flotation agents; specified applications
- B03D2203/02—Ores
- B03D2203/04—Non-sulfide ores
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Abstract
A combined collecting agent for flotation decalcification of magnesite and application thereof belong to the field of magnesite beneficiation and purification processes. The combined collector for flotation decalcification of magnesite comprises oleic acid and dodecyl phosphate, wherein the molar ratio of the oleic acid: dodecyl phosphate (7-9): (1-3). The combined collector for magnesite flotation decalcification is used for a magnesite flotation decalcification process, and more specifically, the combined collector for magnesite flotation decalcification is added into magnesite pulp with the pH value of 7-9 to carry out magnesite flotation decalcification. The application method comprises the steps of grinding ore, mixing slurry, adjusting the pH value to 7-9, and adding a combined collecting agent to perform direct flotation decalcification to obtain the low-calcium magnesite concentrate. The combined medicament for magnesite flotation decalcification has the advantages of small medicament dosage, low cost and easily obtained raw materials, and can solve the problem of poor selectivity of magnesite decalcification flotation when being applied to magnesite flotation decalcification.
Description
Technical Field
The invention relates to the technical field of magnesite beneficiation and purification processes, in particular to a combined collecting agent for magnesite flotation decalcification and application thereof.
Background
After magnesite is mined, the magnesite contains various impurities, the ore structure is complex, the flotation method is mostly researched for low-grade magnesite beneficiation at present, flotation is performed by utilizing the difference of the physicochemical properties of the surface of the ore, non-polar minerals such as talc and the like are easy to separate from the magnesite, but dolomite which is polar minerals with the magnesite is broken, the surface of the minerals is in an ionic bond, the hydrophilicity is strong, flotation is difficult, the floatability difference between the dolomite and the magnesite is small, and calcium, iron and magnesium directly belong to the same class, and are very difficult to separate. Although the prior magnesite direct flotation decalcification is widely applied to industry, sodium oleate is used as a collecting agent, and sodium hexametaphosphate is used as an inhibitor, which is a common medicament for magnesite direct flotation decalcification, the flotation medicament system has the problems of high medicament dosage of sodium oleate, difficult dispersion at low temperature, low selectivity of sodium hexametaphosphate and the like, and when oleic acid is used as the collecting agent for flotation separation of magnesite and dolomite, the yield of concentrate at low temperature is low, the medicament dosage is large, the selectivity of the concentrate is similar to that of the concentrate at low temperature, so that the concentrate and the dolomite cannot be effectively separated; when the dodecyl phosphate is singly used for flotation separation of magnesite and dolomite, the problems of large medicament dosage and very low concentrate yield and poor collecting capability exist, so the characteristic of poor medicament collecting performance or poor selecting performance cannot be solved by using a single collecting agent in the magnesite decalcification flotation process. On one hand, the combined collector can change certain physical and chemical properties of the solution, generates a synergistic effect and has good selectivity and dispersibility, the addition of the auxiliary surfactant is an effective means for improving the performance of the reagent and solving the problem of low-grade complex refractory oxidized ore, on the other hand, the combined collector has good collecting performance and low total dosage of the reagent, and the cost can be reduced while the yield of the concentrate is improved. Therefore, the novel efficient, stable and high-selectivity combined collector can improve the flotation decalcification rate of magnesite and optimize the flotation decalcification process.
Disclosure of Invention
The combined collecting agent for magnesite flotation decalcification has the advantages of small medicament dosage, low cost and easily obtained raw materials, and can solve the problem of poor selectivity of magnesite decalcification flotation when being applied to magnesite flotation decalcification.
The invention relates to a combined collector for magnesite flotation decalcification, which comprises oleic acid and dodecyl phosphate, wherein the molar ratio of the oleic acid: dodecyl phosphate (7-9): (1-3), preferably 8: 2.
The combined collector for magnesite flotation decalcification is used for a magnesite flotation decalcification process, and more specifically, the combined collector for magnesite flotation decalcification is added into magnesite pulp with the pH value of 7-9 for magnesite flotation decalcification.
Further, in the application of the combined collector for magnesite flotation decalcification, the combined collector for magnesite flotation decalcification is prepared into an aqueous solution for application.
The preparation method of the combined collector aqueous solution comprises the following steps: preparing oleic acid into an oleic acid aqueous solution with the molar concentration of 0.40-0.74 mmol/L or directly using the oleic acid, preparing dodecyl phosphate into a dodecyl phosphate aqueous solution with the molar concentration of 0.10-0.18 mmol/L, mixing the oleic acid aqueous solution or the oleic acid with the dodecyl phosphate aqueous solution, and preparing according to the molar ratio of the oleic acid to the dodecyl phosphate.
The combined collector for magnesite flotation decalcification is used for a magnesite flotation decalcification process, and comprises the following steps:
step 1: ore grinding
Crushing and ball-milling high-calcium low-grade magnesite to obtain magnesite powder; wherein, in the magnesite powder, the weight of the magnesite powder with the particle size less than 74 μm accounts for 70-90% of the total weight of the magnesite powder;
step 2: size mixing
Putting magnesite powder into flotation equipment, adding deionized water, uniformly stirring, and carrying out size mixing to obtain magnesite pulp; wherein the mass concentration of the magnesite powder in the magnesite pulp is 20-40%;
and step 3: direct flotation decalcification
Adding a pH value regulator into the magnesite pulp at room temperature, regulating the pH value to 7-9, and uniformly stirring to obtain the magnesite pulp with the pH value of 7-9;
adding a combined collecting agent into magnesite pulp with the pH value of 7-9, uniformly stirring, and then carrying out direct flotation roughing to obtain low-calcium magnesite concentrate; combining the collecting agents according to the solid-liquid ratio: magnesite pulp (70-90) mg: 1L of the compound.
In the step 1, the main components and all the components of the high-calcium low-grade magnesite comprise 25-36 wt% of MgO, 10-15 wt% of CaO and SiO 20 to 0.5%, and the balance LOI and unavoidable impurities.
In the step 2, the flotation equipment is preferably a hanging-groove type flotation machine, and the rotating speed is 1600-1900 rpm.
In the step 3, the pH value regulator is preferably NaOH and HCl; the NaOH is preferably NaOH aqueous solution with the mass fraction of 1-5%; the HCl is preferably an HCl aqueous solution with the mass fraction of 1-10%.
In the step 3, the mixture is uniformly stirred, the stirring speed is 1600-1900 rpm, and the stirring time is 2-5 min.
In the step 3, the pH value is preferably 8.
In the step 3, the combined collector can be prepared into an aqueous solution of the combined collector for use, oleic acid is prepared into an oleic acid aqueous solution with the molar concentration of 0.40-0.74 mmol/L or the oleic acid is directly used, dodecyl phosphate is prepared into a dodecyl phosphate aqueous solution with the molar concentration of 0.10-0.18 mmol/L, the oleic acid aqueous solution or the oleic acid and the dodecyl phosphate aqueous solution are mixed in a mixing ratio, and the mixture is prepared according to the molar ratio of the oleic acid to the dodecyl phosphate.
In the step 3, the rotation speed of the direct flotation equipment for the direct flotation roughing is 1600-1900 rpm, preferably 1800rpm, and the direct flotation time is preferably 3-5 min.
In the step 3, the preferable dosage of the collector oleic acid in the magnesite pulp is 56.5 mg/L; the preferable dosage of the dodecyl phosphate is 13.3mg/L based on the magnesite pulp.
In the step 3, the main components and all of the low-calcium magnesite concentrateThe components by weight percentage are MgO47.75-48.75%, SiO2Less than or equal to 0.3 percent, less than or equal to 0.6 percent of CaO, and the balance of LOI and inevitable impurities.
The combined collector for magnesite flotation decalcification is used in a magnesite flotation decalcification process, the recovery rate of low-calcium magnesite concentrate is 70-90% by weight, the recovery rate of MgO in the low-calcium magnesite concentrate is 70-85% by weight, and the grade of the low-calcium magnesite concentrate is 47.75% -48.75%.
Compared with the prior art, the combined collecting agent for flotation decalcification of magnesite and the application thereof have the beneficial effects that:
1. the combined collector disclosed by the invention has the advantages of easiness in obtaining the components of oleic acid and dodecyl phosphate, low price, small medicament dosage, low production cost, no toxicity, no pollution and environmental friendliness.
2. The combined collecting agent has strong pertinence, the combined collecting agent has strong collecting capability on the calcium-containing magnesite, and the low-calcium magnesite concentrate with the recovery rate of 70-90% and the grade of 47.75% -48.75% can be obtained from the low-grade calcium-containing magnesite by mineral separation.
3. The combined collector has strong selectivity, and can well separate calcium-containing magnesite from ore pulp.
4. Compared with the prior art, the method has the advantages that the processed ore has low grade, and the content of CaO in the raw ore is high; the obtained magnesite concentrate can reach the special grade standard (YB 321-81) of metallurgical industry, namely MgO is more than or equal to 47.00 percent and SiO2≤0.30％、 CaO≤0.8％。
5. The combined collector is used for removing dolomite by decalcification flotation of magnesite, oleic acid has good collecting property and low price on magnesite, so the combined collector is used as a main collector, dodecyl phosphate has certain foamability and can be used as an auxiliary collector, the oleic acid and the dodecyl phosphate generate co-adsorption and competitive adsorption on the surface of the magnesite, the adsorption effect is good, the oleic acid and the dodecyl phosphate both generate hydrophobic substances on the surface of the magnesite, so the magnesite is easier to float, the combined medicament has poor adsorption effect on the surface of dolomite, so the combined collector can effectively and selectively float a large amount of magnesite, and the defects of the selection performance or the collection performance of a single collector are overcome. Solves the problem that the high-calcium magnesite is difficult to treat and even can not be utilized, and has popularization potential.
Drawings
Figure 1 is a schematic of the process flow for the use of the combined collector of the invention in flotation.
Figure 2 is an XRD pattern of the raw material magnesite according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples.
In the following examples, the high-calcium low-grade magnesite used is Liaoning widow water tunnel ditch magnesite, and the element components of the high-calcium low-grade magnesite are analyzed by an X-ray fluorescence spectrum analyzer, and the main components are as follows by weight percent: 35.58% of MgO and SiO20.27% of CaO, 16.05% of CaO, and the balance LOI and unavoidable impurities; the XRD pattern is shown in FIG. 2. The used collecting agents, namely oleic acid and dodecyl phosphate, are chemically pure, and the pH value adjusting agents, namely sodium hydroxide and hydrochloric acid, are analytically pure. All reagents used in the test are prepared into aqueous solutions with corresponding concentrations by using deionized water for later use.
Example 1
A combined collector for magnesite flotation decalcification and application thereof are disclosed, wherein the process flow schematic diagram is shown in figure 1, and the combined collector comprises the following steps:
step 1: ore grinding
Crushing and ball-milling a high-calcium low-grade magnesite raw material to obtain magnesite powder; wherein, in the magnesite powder, the weight of the magnesite powder with the grain size less than 74 μm accounts for 70% of the total weight of the magnesite powder;
step 2: size mixing
Putting magnesite powder with the grain size of less than 74 mu m and accounting for 70% of the total weight of the magnesite powder into a hanging-groove type flotation machine, adding deionized water, uniformly mixing, and carrying out size mixing to obtain magnesite pulp, wherein the mass concentration of the magnesite powder in the magnesite pulp is 30%;
and step 3: direct flotation decalcification
At room temperature, firstly adding a 3% NaOH aqueous solution or a 5% HCl aqueous solution in percentage by mass into the magnesite pulp, adjusting the pH value to 8, and then stirring for 2min until the pulp is uniform to obtain the magnesite pulp with the pH value of 8;
firstly adding a combined collector with the molar concentration of 0.25mmol/L into magnesite pulp with the pH value of 8, wherein the combined collector is a 0.40mmol/L oleic acid aqueous solution and a 0.10mmol/L dodecyl phosphate aqueous solution, and the molar ratio of oleic acid: and mixing dodecyl phosphate 8:2, wherein the addition amount of the combined collecting agent accounts for 70mg/L of the magnesite pulp, stirring for 2min, and finally performing 3min direct flotation roughing to obtain the low-calcium magnesite concentrate. In the test process, the rotating speed of the flotation machine is set to be 1800 r/min.
In this example, the main components of the low-calcium magnesite concentrate are 48.25% by weight of MgO and 48.25% by weight of SiO20.21% of CaO, 0.47% of CaO, and the balance LOI and unavoidable impurities; the MgO in the low-calcium magnesite concentrate accounts for 82.75 percent of the total weight of the MgO in the raw materials.
Example 2
A combined collector for magnesite flotation decalcification and application thereof comprise the following steps:
step 1: ore grinding
Crushing and ball-milling a high-calcium low-grade magnesite raw material to obtain magnesite powder; wherein, in the magnesite powder, the weight of the magnesite powder with the grain size less than 74 μm accounts for 70% of the total weight of the magnesite powder;
step 2: size mixing
Putting magnesite powder with the grain size of less than 74 mu m and accounting for 70% of the total weight of the magnesite powder into a hanging-groove type flotation machine, adding deionized water, uniformly mixing, and carrying out size mixing to obtain magnesite pulp, wherein the mass concentration of the magnesite powder in the magnesite pulp is 25%;
and step 3: direct flotation decalcification
At room temperature, firstly adding a 3% NaOH aqueous solution or a 5% HCl aqueous solution in percentage by mass into the magnesite pulp, adjusting the pH value to 9, and then stirring for 2min until the pulp is uniform to obtain the magnesite pulp with the pH value of 9;
firstly adding a combined collector with the molar concentration of 0.35mmol/L into magnesite pulp with the pH value of 9, wherein the combined collector is a 0.56mmol/L oleic acid aqueous solution and a 0.14mmol/L dodecyl phosphate aqueous solution, and the molar ratio of oleic acid: and mixing dodecyl phosphate 8:2, wherein the addition amount of the combined collecting agent accounts for 80mg/L of the magnesite pulp, stirring for 2min, and finally performing 3min direct flotation roughing to obtain the low-calcium magnesite concentrate. In the test process, the rotating speed of the flotation machine is set to be 1800 r/min.
In this example, the main components of the low-calcium magnesite concentrate are 48.43% by weight of MgO and 48.43% by weight of SiO20.1% of CaO, 0.39% of CaO, and the balance LOI and unavoidable impurities; the MgO in the low-calcium magnesite concentrate accounts for 80.16 percent of the total weight of the MgO in the raw materials.
Example 3
A combined collector for magnesite flotation decalcification and application thereof comprise the following steps:
step 1: ore grinding
Crushing and ball-milling a high-calcium low-grade magnesite raw material to obtain magnesite powder; wherein, in the magnesite powder, the weight of the magnesite powder with the grain size less than 74 μm accounts for 80% of the total weight of the magnesite powder;
step 2: size mixing
Putting magnesite powder with the grain size of less than 74 mu m and accounting for 80% of the total weight of the magnesite powder into a hanging-groove type flotation machine, adding deionized water, uniformly mixing, and carrying out size mixing to obtain magnesite pulp, wherein the mass concentration of the magnesite powder in the magnesite pulp is 40%;
and step 3: direct flotation decalcification
At room temperature, firstly adding 2% NaOH aqueous solution or 3% HCl aqueous solution by mass fraction into magnesite pulp, adjusting the pH value to 8, and then stirring for 2min until the pulp is uniform to obtain the magnesite pulp with the pH value of 8;
firstly adding a combined collector with the molar concentration of 0.46mmol/L into magnesite pulp with the pH value of 8, wherein the combined collector is 0.74mmol/L oleic acid aqueous solution and 0.18mmol/L dodecyl phosphate aqueous solution, and the molar ratio of oleic acid: and mixing dodecyl phosphate 8:2, wherein the addition amount of the combined collecting agent accounts for 70mg/L of the magnesite pulp, stirring for 2min, and finally performing 3min direct flotation roughing to obtain the low-calcium magnesite concentrate. In the test process, the rotating speed of the flotation machine is set to 1600 r/min.
In this example, the main components of the low-calcium magnesite concentrate are 47.83% by weight of MgO and 47.83% by weight of SiO20.19% of CaO, 0.43% of CaO, and the balance LOI and unavoidable impurities; the MgO in the low-calcium magnesite concentrate accounts for 73.25 percent of the total weight of the MgO in the raw materials.
Example 4
A combined collector for magnesite flotation decalcification and application thereof comprise the following steps:
step 1: ore grinding
Crushing and ball-milling a high-calcium low-grade magnesite raw material to obtain magnesite powder; wherein, in the magnesite powder, the magnesite powder with the grain size less than 74 μm accounts for 90% of the total weight of the magnesite powder;
step 2: size mixing
Putting magnesite powder with the grain size of less than 74 mu m and accounting for 90 percent of the total weight of the magnesite powder into a hanging-groove type flotation machine, adding deionized water, uniformly mixing, and carrying out size mixing to obtain magnesite pulp, wherein the mass concentration of the magnesite powder in the magnesite pulp is 32 percent;
and step 3: direct flotation decalcification
At room temperature, firstly adding a 3% NaOH aqueous solution or a 5% HCl aqueous solution in percentage by mass into the magnesite pulp, adjusting the pH value to 8, and then stirring for 2min until the pulp is uniform to obtain the magnesite pulp with the pH value of 8;
adding a combined collector with a molar concentration of 0.28mmol/L into magnesite pulp with a pH value of 9, wherein the combined collector is a 0.45mmol/L oleic acid aqueous solution and a 0.11mmol/L dodecyl phosphate aqueous solution, and the molar ratio of oleic acid: and mixing dodecyl phosphate 8:2, wherein the addition amount of the combined collecting agent accounts for 90mg/L of the magnesite pulp, stirring for 2min, and finally performing 3min direct flotation roughing to obtain the low-calcium magnesite concentrate. In the test process, the rotating speed of the flotation machine is set to be 1800 r/min.
In the embodiment, the main components of the low-calcium magnesite concentrate comprise 48.5 percent by weight of MgO and 48.5 percent by weight of SiO20.25% of CaO, 0.47% of CaO, and the balance LOI and unavoidable impurities; the MgO in the low-calcium magnesite concentrate accounts for 83.75% of the total weight of the MgO in the raw materials.
Example 5
A combined collector for magnesite flotation decalcification and application thereof comprise the following steps:
step 1: ore grinding
Crushing and ball-milling a high-calcium low-grade magnesite raw material to obtain magnesite powder; wherein, in the magnesite powder, the weight of the magnesite powder with the grain size less than 74 μm accounts for 80% of the total weight of the magnesite powder;
step 2: size mixing
Putting magnesite powder with the grain size of less than 74 mu m and accounting for 80 percent of the total weight of the magnesite powder into a hanging-groove type flotation machine, adding deionized water, uniformly mixing, and carrying out size mixing to obtain magnesite pulp, wherein the mass concentration of the magnesite powder in the magnesite pulp is 38 percent;
and step 3: direct flotation decalcification
At room temperature, firstly adding a NaOH aqueous solution with the mass fraction of 3% and an HCl aqueous solution with the mass fraction of 5% into magnesite pulp, adjusting the pH value to 7, and then stirring for 2min until the pulp is uniform to obtain the magnesite pulp with the pH value of 10;
firstly adding a combined collector with the molar concentration of 0.35mmol/L into magnesite pulp with the pH value of 7, wherein the combined collector is 0.56mmol/L oleic acid aqueous solution and 0.14mmol/L dodecyl phosphate aqueous solution, and the molar ratio of oleic acid: and mixing dodecyl phosphate 8:2, wherein the addition amount of the combined collecting agent accounts for 70mg/L of the magnesite pulp, stirring for 2min, and finally performing 3min direct flotation roughing to obtain the low-calcium magnesite concentrate. In the test process, the rotation speed of the flotation machine is set to be 1900 r/min.
In the embodiment, the main components of the low-calcium magnesite concentrate comprise 47.9 percent by weight of MgO and 47.9 percent by weight of SiO20.25% of CaO, 0.49% of CaO, and the balance LOI and unavoidable impurities(ii) a The MgO in the low-calcium magnesite concentrate accounts for 74.65% of the total weight of the MgO in the raw materials.
Example 6
A combined collector for magnesite flotation decalcification and application thereof comprise the following steps:
step 1: ore grinding
Crushing and ball-milling a high-calcium low-grade magnesite raw material to obtain magnesite powder; wherein, in the magnesite powder, the weight of the magnesite powder with the grain size less than 74 μm accounts for 80% of the total weight of the magnesite powder;
step 2: size mixing
Putting magnesite powder with the grain size of less than 74 mu m and accounting for 80% of the total weight of the magnesite powder into a hanging-groove type flotation machine, adding deionized water, uniformly mixing, and carrying out size mixing to obtain magnesite pulp, wherein the mass concentration of the magnesite powder in the magnesite pulp is 20%;
and step 3: direct flotation decalcification
At room temperature, firstly adding a NaOH aqueous solution with the mass fraction of 3% and an HCl aqueous solution with the mass fraction of 5% into magnesite pulp, adjusting the pH value to 9, and then stirring for 2min until the pulp is uniform to obtain the magnesite pulp with the pH value of 9;
firstly adding a combined collector with the molar concentration of 0.30mmol/L into magnesite pulp with the pH value of 9, wherein the combined collector is a 0.48mmol/L oleic acid aqueous solution and a 0.12mmol/L dodecyl phosphate aqueous solution, and the molar ratio of oleic acid: and mixing dodecyl phosphate 8:2, wherein the addition amount of the combined collecting agent accounts for 80mg/L of the magnesite pulp, stirring for 2min, and finally performing 3min direct flotation roughing to obtain the low-calcium magnesite concentrate. In the test process, the rotating speed of the flotation machine is set to 1700 r/min.
In this example, the main components of the low-calcium magnesite concentrate are 48.22% by weight of MgO and SiO20.24% of CaO, 0.5% of CaO, and the balance LOI and unavoidable impurities; the MgO in the low-calcium magnesite concentrate accounts for 78.03 percent of the total weight of the MgO in the raw materials.
Example 7
Combined collecting agent for magnesite flotation decalcification and application thereof, and simultaneous implementationExample 1, except that the pulp pH was 7, the molar concentration was 0.30mmol/L, the combined collector oleic acid aqueous solution and the dodecyl phosphate aqueous solution, wherein the combined collector addition amount accounted for 90mg/L of the magnesite pulp amount, the combined collector obtained low-calcium magnesite concentrate had the main components of, by weight percentage, 47.98% MgO, SiO20.13% of CaO, 0.38% of CaO, and the balance LOI and unavoidable impurities; the MgO in the low-calcium magnesite concentrate accounts for 79.56% of the total weight of the MgO in the raw materials.
Example 8
The combined collector for flotation decalcification of magnesite and the application thereof are the same as the embodiment 1, and the difference is that the pH value of ore pulp is 8, the molar concentration of the combined collector is 0.43mmol/L, namely oleic acid aqueous solution and dodecyl phosphate aqueous solution, wherein the combined collector accounts for 48.37 percent of MgO in percentage by weight of the main components of low-calcium magnesite concentrate obtained by combining the collector with the magnesite pulp amount of 90mg/L, and SiO is added20.18% of CaO, 0.3% of CaO, and the balance LOI and unavoidable impurities; the MgO in the low-calcium magnesite concentrate accounts for 74.5 percent of the total weight of the MgO in the raw materials.
Comparative example 1
The single collector for magnesite flotation decalcification is used for the magnesite flotation decalcification process, and comprises the following steps:
step 1: ore grinding
Crushing and ball-milling high-calcium low-grade magnesite to obtain magnesite powder; wherein, in the magnesite powder, the weight of the magnesite powder with the grain size less than 74 μm accounts for 70% of the total weight of the magnesite powder;
step 2: size mixing
Putting magnesite powder with the grain size of less than 74 mu m and accounting for 70 percent of the total weight of the magnesite powder into flotation equipment, adding deionized water, uniformly stirring, and carrying out size mixing to obtain magnesite pulp; wherein the mass concentration of the magnesite powder in the magnesite pulp is 30 percent;
and step 3: direct flotation decalcification
Adding a NaOH aqueous solution with the mass fraction of 3% or an HCl aqueous solution with the mass fraction of 5% into the magnesite pulp at room temperature, adjusting the pH value to 8, and stirring for 2min until the pulp is uniform to obtain the magnesite pulp with the pH value of 8;
adding 0.40mmol/L oleic acid aqueous solution serving as a collecting agent into magnesite pulp with the pH value of 8, stirring for 2min until the mixture is uniform, and then carrying out 3min direct flotation roughing to obtain low-calcium magnesite concentrate; according to the solid-liquid ratio, an oleic acid collector: magnesite pulp 70 mg: 1L of the compound. In the test process, the rotating speed of the flotation machine is set to be 1800 r/min.
In the embodiment, the main components and all the components of the prepared low-calcium magnesite concentrate are MgO33.5 percent and SiO in percentage by weight2Less than or equal to 0.4 percent, less than or equal to 10 percent of CaO, and the balance of LOI and inevitable impurities.
The single agent is used in the flotation decalcification process of magnesite, the recovery rate of the low-calcium magnesite concentrate is 80 percent by weight, and the recovery rate of MgO in the low-calcium magnesite concentrate is 60 percent by weight.
Comparative example 2
The single collecting agent for magnesite flotation decalcification is used for the magnesite flotation decalcification process, and the difference is that, like the comparative example 1:
in the step 3, the usage amount of the collecting agent oleic acid accounts for 80mg/L of magnesite pulp.
In the embodiment, the main components and all the components of the prepared low-calcium magnesite concentrate are MgO40.5 percent and SiO according to the weight percentage2Less than or equal to 0.4 percent, less than or equal to 10 percent of CaO, and the balance of LOI and inevitable impurities.
The single agent is used in the flotation decalcification process of magnesite, the recovery rate of the low-calcium magnesite concentrate is 60 percent by weight, and the recovery rate of MgO in the low-calcium magnesite concentrate is 75 percent by weight.
Comparative example 3
The single collector for magnesite flotation decalcification is used for the magnesite flotation decalcification process, and comprises the following steps:
step 1: ore grinding
Crushing and ball-milling high-calcium low-grade magnesite to obtain magnesite powder; wherein, in the magnesite powder, the magnesite powder with the particle size less than 74 μm accounts for 70% of the total weight of the magnesite powder;
step 2: size mixing
Putting magnesite powder with the grain size of less than 74 mu m and accounting for 70 percent of the total weight of the magnesite powder into flotation equipment, adding deionized water, uniformly stirring, and carrying out size mixing to obtain magnesite pulp; wherein the mass concentration of the magnesite powder in the magnesite pulp is 30 percent;
and step 3: direct flotation decalcification
Adding a NaOH aqueous solution with the mass fraction of 3% or an HCl aqueous solution with the mass fraction of 5% into the magnesite pulp at room temperature, adjusting the pH value to 8, and stirring for 2min until the pulp is uniform to obtain the magnesite pulp with the pH value of 8;
adding 0.10mmol/L dodecyl phosphate aqueous solution serving as a single collecting agent into magnesite pulp with the pH value of 8, stirring for 2min till the mixture is uniform, and then carrying out 3min direct flotation roughing to obtain low-calcium magnesite concentrate; according to the solid-liquid ratio, dodecyl phosphate ester collecting agent: magnesite pulp 70 mg: 1L of the compound. In the test process, the rotating speed of the flotation machine is set to be 1800 r/min.
In this example, the main component and each component of the low-calcium magnesite concentrate prepared by the method are mgo27.5% and SiO in percentage by weight2Less than or equal to 0.4 percent, less than or equal to 1 percent of CaO, and the balance of LOI and inevitable impurities.
The single reagent dodecyl phosphate is used in the flotation decalcification process of magnesite, the recovery rate of magnesite concentrate is 70 percent by weight, and the recovery rate of MgO in the magnesite concentrate is 60 percent by weight.
Comparative example 4
The single collecting agent for magnesite flotation decalcification is used for the magnesite flotation decalcification process, and the difference is that, like the comparative example 3:
in the step 3, the usage amount of the collector dodecyl phosphate accounts for 80mg/L of the magnesite pulp.
In this embodiment, the main components and the components of the prepared magnesite concentrate are, by weight, mgo 34.5% and SiO2Less than or equal to 0.4 percent, less than or equal to 1 percent of CaO, and the balance of LOI and inevitable impurities.
The single reagent dodecyl phosphate is used in the flotation decalcification process of magnesite, the recovery rate of magnesite concentrate is 50% by weight, and the recovery rate of MgO in the magnesite concentrate is 75% by weight.
Comparing comparative examples 1-4 with example 1, it can be seen that when only a single collector oleic acid is added, the recovery rate of the concentrate is reduced, the calcium removal effect is poor, magnesite and dolomite cannot be separated, and the special-grade standard of the metallurgical industry (MgO is more than or equal to 47.00 percent, SiO is not higher than or equal to 47.00 percent) is not met by comparing the flotation result with the flotation result of adding a combined collector2Less than or equal to 0.3 percent and less than or equal to 0.8 percent of CaO). When only single collecting agent dodecyl phosphate is added, compared with the flotation result of adding the combined collecting agent, the recovery rate of the concentrate is greatly reduced, the calcium removal effect is superior to that of oleic acid, but the content of CaO in the concentrate is still higher than that of the combined collecting agent. Therefore, through comparison, the combined collector maintains good collecting property and improves selectivity of magnesite and dolomite when the magnesite and the dolomite are separated by flotation.
Claims (6)
1. The application of the combined collector for magnesite flotation decalcification is characterized in that the combined collector for magnesite flotation decalcification is used for a magnesite flotation decalcification process, and comprises the following steps:
step 1: ore grinding
Crushing and ball-milling high-calcium low-grade magnesite to obtain magnesite powder; wherein, in the magnesite powder, the weight of the magnesite powder with the particle size less than 74 μm accounts for 70-90% of the total weight of the magnesite powder;
step 2: size mixing
Putting magnesite powder into flotation equipment, adding deionized water, uniformly stirring, and carrying out size mixing to obtain magnesite pulp; wherein the mass concentration of the magnesite powder in the magnesite pulp is 20-40%;
and step 3: direct flotation decalcification
Adding a pH value regulator into the magnesite pulp at room temperature, regulating the pH value to 7-9, and uniformly stirring to obtain the magnesite pulp with the pH value of 7-9;
adding a combined collecting agent into magnesite pulp with the pH value of 7-9, uniformly stirring, and then carrying out direct flotation roughing to obtain low-calcium magnesite concentrate; combining the collecting agents according to the solid-liquid ratio: magnesite pulp (70-90) mg: 1L;
the combined collector for flotation decalcification of magnesite comprises oleic acid and dodecyl phosphate, wherein the molar ratio of the oleic acid: dodecyl phosphate = (7-9): (1-3);
wherein the recovery rate of the low-calcium magnesite concentrate is 70-90 wt%, the recovery rate of MgO in the low-calcium magnesite concentrate is 70-85 wt%, and the grade of the low-calcium magnesite concentrate is 47.75-48.75%.
2. The application of the combined collector for magnesite flotation decalcification according to claim 1, wherein the combined collector for magnesite flotation decalcification is prepared into an aqueous solution for application.
3. The application of the combined collector for magnesite flotation decalcification according to claim 2, wherein the combined collector aqueous solution is configured in a way that: preparing oleic acid into an oleic acid aqueous solution with the molar concentration of 0.40-0.74 mmol/L or directly using the oleic acid, preparing dodecyl phosphate into a dodecyl phosphate aqueous solution with the molar concentration of 0.10-0.18 mmol/L, mixing the oleic acid aqueous solution or the oleic acid with the dodecyl phosphate aqueous solution, and preparing according to the molar ratio of the oleic acid to the dodecyl phosphate.
4. The application of the combined collector for flotation decalcification of magnesite according to claim 1, wherein in the step 1, the main components and all the components of the high-calcium low-grade magnesite comprise 25-36 wt% of MgO, 10-15 wt% of CaO and SiO20 to 0.5%, and the balance LOI and unavoidable impurities.
5. The application of the combined collector for magnesite flotation decalcification according to claim 1, wherein in the step 3, the direct flotation roughing is performed, the rotation speed of a direct flotation device is 1600-1900 rpm, and the direct flotation time is 3-5 min.
6. The application of the combined collector for magnesite flotation decalcification according to claim 1, wherein in the step 3, the main components and all the components of the low-calcium magnesite concentrate are MgO47.75-48.75% by weight and SiO2Less than or equal to 0.3 percent, less than or equal to 0.6 percent of CaO, and the balance of LOI and inevitable impurities.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102259063A (en) * | 2011-06-03 | 2011-11-30 | 湖北富邦科技股份有限公司 | Collophanite obverse-reverse flotation collecting agent and preparation method thereof |
| JP2012115781A (en) * | 2010-12-02 | 2012-06-21 | Sumitomo Metal Mining Co Ltd | Method of beneficiating copper-containing material containing arsenic |
| CN102513221A (en) * | 2012-01-10 | 2012-06-27 | 贵州大学 | Carbonate phosphorite reverse flotation combined collecting agent and preparation method thereof |
| CN102553725A (en) * | 2012-02-08 | 2012-07-11 | 中南大学 | Composite floatation collector and preparation method thereof |
| CN103272702A (en) * | 2013-06-08 | 2013-09-04 | 北京矿冶研究总院 | Flotation collector and method for obtaining high-grade magnesite concentrate from low-grade magnesite |
| CN106345616A (en) * | 2016-11-28 | 2017-01-25 | 肃北镁科技耐火材料有限责任公司 | Flotation calcium-removing agent and method for magnesite |
| CN108672092A (en) * | 2018-05-16 | 2018-10-19 | 东北大学 | The process for effectively purifying of the low grade shepardite of high-silicon high calcium high ferro |
-
2019
- 2019-10-28 CN CN201911030591.6A patent/CN110899000B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012115781A (en) * | 2010-12-02 | 2012-06-21 | Sumitomo Metal Mining Co Ltd | Method of beneficiating copper-containing material containing arsenic |
| CN102259063A (en) * | 2011-06-03 | 2011-11-30 | 湖北富邦科技股份有限公司 | Collophanite obverse-reverse flotation collecting agent and preparation method thereof |
| CN102513221A (en) * | 2012-01-10 | 2012-06-27 | 贵州大学 | Carbonate phosphorite reverse flotation combined collecting agent and preparation method thereof |
| CN102553725A (en) * | 2012-02-08 | 2012-07-11 | 中南大学 | Composite floatation collector and preparation method thereof |
| CN103272702A (en) * | 2013-06-08 | 2013-09-04 | 北京矿冶研究总院 | Flotation collector and method for obtaining high-grade magnesite concentrate from low-grade magnesite |
| CN106345616A (en) * | 2016-11-28 | 2017-01-25 | 肃北镁科技耐火材料有限责任公司 | Flotation calcium-removing agent and method for magnesite |
| CN108672092A (en) * | 2018-05-16 | 2018-10-19 | 东北大学 | The process for effectively purifying of the low grade shepardite of high-silicon high calcium high ferro |
Non-Patent Citations (2)
| Title |
|---|
| 十二烷基磷酸酯作为捕收剂浮选分离菱镁矿与白云石的探索;李晓安等;《中国矿业》;19970515;第6卷(第3期);第78-81页 * |
| 复配捕收剂从白云石中选择性浮选菱锌矿（英文）;王丽等;《Transactions of Nonferrous Metals Society of China》;《中国学术期刊（光盘版）》电子杂志社;20190515(第5期);第1082-1088页 * |
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