CN112221697B - Novel scheelite rough concentrate heating and reagent removing process - Google Patents
Novel scheelite rough concentrate heating and reagent removing process Download PDFInfo
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Abstract
A novel scheelite rough concentrate heating and reagent removal process comprises the following steps: crushing and grinding low-grade scheelite to obtain ore pulp, performing a primary and secondary scavenging flotation process to obtain scheelite rough concentrate, concentrating the rough concentrate, discharging underflow, heating the rough concentrate in a heating barrel, introducing steam, injecting water glass into the bottom of the heating barrel, continuously heating, keeping strong stirring, keeping the temperature, standing, extracting upper-layer grease, and performing scheelite roughing; and (4) feeding the ore pulp below the heating barrel into a tungsten concentration process, and performing primary and secondary fine cleaning and three-pass cleaning to obtain tungsten concentrate. According to the process, sodium oleate in the rough concentrate is extracted and enters the tungsten roughing flow, so that the content of residual sodium oleate in the tungsten roughing flow is reduced, the using amount of sodium oleate in the roughing section is saved, and the efficient recovery of low-grade scheelite is realized; still through changing ore pulp surface injection water glass into bottom injection water glass, promoted the diffusion of water glass and gangue mineral and fused, promoted gangue mineral suppression effect, reduced water glass consumption.
Description
Technical Field
The invention relates to the technical field of mineral processing technology, in particular to a novel scheelite rough concentrate heating and reagent removal technology.
Background
The tungsten reserves of China are the first in the world, and the scheelite reserves account for 70.4 percent of the tungsten reserves of China, wherein 81.1 percent of ores WO3 are of a grade less than 0.4 percent and belong to low-grade scheelite. Due to the reasons of complex components, fine embedded granularity and the like of the low-grade scheelite, the recycling difficulty of the low-grade scheelite is higher. At present, the recovery method of most of the scheelite in China mainly adopts a two-stage flotation method, namely, rough concentrate is obtained through preselection, and the rough concentrate is concentrated and then is refined by a Peterov method to obtain concentrate. The essence of the 'Pederov method' is that the dense slurry is added with proper amount of water glass under the conditions of high temperature and strong stirring to carry out the drug removal inhibition on the gangue minerals.
The defects existing in the conventional scheelite flotation method are as follows: the whole scheelite rough concentrate takes off the medicine process and all accomplishes in the bucket that heats, and the oleic acid that the gangue mineral was resolved by water glass and is taken off floats on the ore pulp surface and is not separated out, mainly can produce two aspects adverse effects: firstly, residual oleic acid in the tungsten concentration process can affect the drug removal effect of gangue minerals, so that the grade of concentrate is reduced; and the residual oleic acid has reversible reaction of adsorption and removal of the pesticide, so that the consumption of water glass in the heating and pesticide removal section is increased.
Disclosure of Invention
In view of the above, in order to solve the defects of the prior art, the invention aims to provide a novel heating and reagent removing process for scheelite rough concentrate, which improves the reagent removing effect of gangue minerals, improves the grade of scheelite selected concentrate, reduces the consumption of heating and reagent removing water glass, and improves the economic benefit of scheelite selection.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a novel scheelite rough concentrate heating and reagent removal process comprises the following steps:
(1) taking low-grade scheelite, grinding the scheelite until the granularity of the scheelite is less than 0.074mm accounts for 50-65% to obtain ore pulp, adding a pH regulator, an inhibitor and a collecting agent into the ore pulp, and performing a one-coarse-two-sweep flotation process to obtain coarse concentrate;
(2) conveying the rough concentrate obtained in the step (1) to a No. 1 thickener for concentration, discharging underflow ore pulp into a heating barrel, and overflowing supernatant into a No. 2 thickener for secondary sedimentation;
(3) introducing steam into the ore pulp in the heating barrel in the step (2), keeping strong stirring, heating the ore pulp to 86-88 ℃, adding an inhibitor into the bottom of the heating barrel, continuously heating to 90-92 ℃, stopping introducing the steam, stirring strongly and keeping the temperature for 30-60 min;
(4) standing and precipitating the ore pulp subjected to heat preservation in the step (3) in a heating barrel for 60-120 min, and then extracting grease dissociated from the upper layer from the ore pulp;
(5) And (4) returning the grease extracted in the step (4) to the scheelite roughing section, feeding the ore pulp at the lower layer of the heating barrel into the scheelite dressing section, and performing one-roughing, two-refining and three-sweeping to obtain tungsten concentrate.
Further, in the step (1), WO in the low-grade scheelite3The content of (A) is 0.03-0.12%; the pH regulator is sodium carbonate, and the addition amount of 1t of raw ore is 1200-2100 g; the inhibitor is water glass, and the addition amount of 1t of raw ore is 0-1000 g; the collecting agent is one or more of sodium aliphatate, oxidized paraffin and hydroximic acid, and the addition amount of 1t of raw ore is 120-350 g.
Further, in the step (2), the concentration of the concentrated ore pulp discharged from the underflow is 65-75%, and the concentration of the supernatant overflow is less than or equal to 5%.
Further, in the step (3), the addition amount of the inhibitor in 1t of the rough concentrate dry ore is 2-4 kg.
Further, in the step (4), the extraction amount of the upper layer grease is 5-10% of the total volume of the ore pulp.
Further, in the step (3), water glass is injected from the bottom by using a water glass adding device, the water glass adding device comprises a water glass storage pool and an annular pipeline, the annular pipeline is arranged around the bottom of the heating barrel and inserted into the heating barrel, the annular pipeline is connected with the water glass storage pool through a conveying pipe, a water glass pumping pump and a pressure gauge are arranged on the conveying pipe close to the water glass storage pool, a flow meter is arranged close to the heating barrel, and a check valve is arranged at the inlet of the annular pipeline at the heating barrel.
Furthermore, a pipe clamp valve is arranged between the water glass storage pool and the water glass pumping pump, and four check valves are symmetrically arranged on the heating barrel.
Furthermore, a stirring blade is arranged in the heating barrel, and a motor and a speed reducer are arranged at the top of the heating barrel.
The invention has the beneficial effects that:
after sodium oleate in the rough concentrate is extracted, the content of residual sodium oleate in the tungsten concentration process is reduced, the gangue minerals are inhibited from floating upwards, and the tungsten concentration technical index is improved;
secondly, sodium oleate on the surface of the rough concentrate is extracted to a tungsten preselection flow, so that a preselection section collecting agent (the consumption of the sodium oleate) can be effectively reduced, and the beneficiation cost is saved;
according to the characteristic that the density of the water glass is lower than that of the rough concentrate, the water glass injected into the surface of the ore pulp is changed into the water glass injected into the bottom, so that the water glass and the gangue minerals are better diffused and fused, the inhibiting effect of the gangue minerals is improved, and the consumption of the water glass is reduced; the specially arranged water glass adding device calculates the mass of the water glass required to be added through the dry ore mass of the heating barrel, then calculates the volume of the water glass according to the volume of the water glass, the quantitative water glass enters the annular pipeline through the pumping pump under the metering of the flow meter, the water glass in the annular pipeline enters the bottom of the heating barrel through four pipelines with one-way valves at the bottom and reacts with gangue minerals in ore pulp, and therefore the effect of analyzing the gangue mineral surface collecting agent is achieved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principle of the invention.
FIG. 1 is a flow chart of a scheelite sorting process according to the present invention;
FIG. 2 is a flow chart of a process for grading scheelite in comparison example;
FIG. 3 is a schematic structural diagram of a device for adding water glass to the bottom of a heating barrel;
FIG. 4 is a top view of the warming barrel and a portion of the water glass apparatus thereon;
reference numerals: 1. the device comprises a motor, 2, a speed reducer, 3, a heating barrel, 4, stirring blades, 5, an annular pipeline, 6, a one-way valve, 7, a flowmeter, 8, a pressure gauge, 9, a water glass pumping pump, 10, a pipe clamp valve, 11 and a water glass storage pool.
Detailed Description
The following specific examples are given to further clarify, complete and detailed the technical solution of the present invention. The present embodiment is a preferred embodiment based on the technical solution of the present invention, but the scope of the present invention is not limited to the following embodiments.
The main chemical components of the low-grade scheelite ore used in the present invention are shown in the following table 1:
TABLE 1 main chemical composition of low grade scheelite ore
Example 1
A novel scheelite rough concentrate heating and reagent removal process is processed according to a sorting process shown in figure 1, and comprises the following steps:
(1) Taking low grade whiteGrinding tungsten ore until the granularity of less than 0.074mm accounts for 55 percent to obtain ore pulp, adding a pH regulator, an inhibitor and a collector into the ore pulp, and performing a one-coarse-two-sweep flotation process to obtain coarse concentrate; wherein, the low-grade scheelite is WO3The content of (A) is 0.0473%; the pH regulator is sodium carbonate, and the addition amount of 1t of raw ore is 1200 g; the inhibitor is water glass, and the addition amount of 1t of raw ore is 600 g; the collecting agent is one or more of sodium aliphatate, oxidized paraffin and hydroximic acid, and the addition amount of 1t of raw ore is 160 g;
(2) conveying the rough concentrate obtained in the step (1) to a No. 1 thickener for concentration, discharging underflow ore pulp into a heating barrel, discharging supernatant liquor to enter a No. 2 thickener for secondary sedimentation, wherein the concentration of the concentrated ore pulp discharged by underflow is 70%, and the overflow concentration of the supernatant liquor is less than or equal to 5%;
(3) introducing steam into the ore pulp in the heating barrel in the step (2), keeping strong stirring, heating the ore pulp to 88 ℃, adding an inhibitor through the bottom of the heating barrel, continuously heating to 92 ℃ until the addition of the inhibitor in 1t of coarse concentrate dry ore is 2kg, stopping introducing the steam, stirring strongly and keeping the temperature for 30 min;
(4) standing and precipitating the ore pulp subjected to heat preservation in the step (3) in a heating barrel for 60min, and then extracting grease dissociated from the upper layer from the ore pulp, wherein the extraction amount of the grease on the upper layer is 6% of the total volume of the ore pulp;
(5) And (5) returning the grease extracted in the step (4) to the scheelite roughing section, feeding the ore pulp at the lower layer of the heating barrel into the scheelite dressing section, and performing one-roughing, two-refining and three-sweeping to obtain tungsten concentrate.
Further, in the step (3), water glass is injected from the bottom by using a water glass adding device, as shown in fig. 3 and 4, the water glass adding device comprises a water glass storage pool 11 and an annular pipeline 5, the annular pipeline 5 is arranged around the bottom of the heating barrel 3 and is inserted into the heating barrel 3, the annular pipeline 5 is connected with the water glass storage pool 11 through a conveying pipe, a water glass pumping pump 9 and a pressure gauge 8 are arranged on the conveying pipe at a position close to the water glass storage pool 11, a flow meter 7 is arranged at a position close to the heating barrel 3, a check valve 6 is arranged at an inlet of the heating barrel 3 on the annular pipeline 5, a pipe clamp valve 10 is arranged between the water glass storage pool 11 and the water glass pumping pump 9, four check valves 6 are symmetrically arranged on the heating barrel 3, and stirring blades 4 are arranged in the heating barrel 3, the top is provided with a motor 1 and a speed reducer 2; the water glass adding device calculates the mass of the added water glass required by the dry ore mass of the heating barrel, calculates the volume of the water glass according to the volume of the water glass, and the quantitative water glass enters the annular pipeline through the delivery pump under the measurement of the flow meter, and enters the bottom of the heating barrel through four pipelines with one-way valves at the bottom to react with gangue minerals in ore pulp, so that the effect of analyzing the gangue mineral surface collecting agent is achieved.
Example 2
A novel scheelite rough concentrate heating and reagent removal process is processed according to a sorting process shown in figure 1, and comprises the following steps:
(1) taking low-grade scheelite, grinding the scheelite to the particle size of below 0.074mm which accounts for 60 percent to obtain ore pulp, adding a pH regulator, an inhibitor and a collector into the ore pulp, and performing a one-coarse-two-sweep flotation process to obtain coarse concentrate; wherein, the low-grade scheelite is WO3The content of (A) is 0.0473%; the pH regulator is sodium carbonate, and the addition amount of 1t of raw ore is 1500 g; the inhibitor is water glass, and the addition amount of 1t of raw ore is 800 g; the collecting agent is one or more of sodium aliphatate, oxidized paraffin and hydroximic acid, and the addition amount of 1t of raw ore is 200 g;
(2) conveying the rough concentrate obtained in the step (1) to a No. 1 thickener for concentration, discharging underflow ore pulp into a heating barrel, discharging supernatant liquor to enter a No. 2 thickener for secondary sedimentation, wherein the concentration of the concentrated ore pulp discharged by underflow is 70%, and the overflow concentration of the supernatant liquor is less than or equal to 5%;
(3) introducing steam into the ore pulp in the heating barrel in the step (2), keeping strong stirring, heating the ore pulp to 88 ℃, adding an inhibitor through the bottom of the heating barrel, wherein the addition amount of the inhibitor in 1t of coarse concentrate dry ore is 2.5kg, continuously heating to 92 ℃, stopping introducing the steam, stirring strongly and keeping the temperature for 45 min;
(4) Standing and precipitating the ore pulp subjected to heat preservation in the step (3) in a heating barrel for 90min, and then extracting grease dissociated from the upper layer from the ore pulp, wherein the extraction amount of the grease on the upper layer is 8% of the total volume of the ore pulp;
(5) and (4) returning the grease extracted in the step (4) to the scheelite roughing section, feeding the ore pulp at the lower layer of the heating barrel into the scheelite dressing section, and performing one-roughing, two-refining and three-sweeping to obtain tungsten concentrate.
Further, in the step (3), water glass is injected from the bottom by using a water glass adding device, the water glass adding device comprises a water glass storage pool 11 and an annular pipeline 5, the annular pipeline 5 is arranged along the bottom of the heating barrel 3 in a surrounding way, and is inserted into the heating barrel 3, the annular pipeline 5 is connected with the water glass storage tank 11 through a delivery pipe, a water glass pumping pump 9 and a pressure gauge 8 are arranged on the conveying pipe at a position close to the water glass storage pool 11, a flowmeter 7 is arranged near the heating barrel 3, a one-way valve 6 is arranged at the inlet of the heating barrel 3 of the annular pipeline 5, a pipe clamp valve 10 is arranged between the water glass storage tank 11 and the water glass pumping pump 9, four check valves 6 are symmetrically arranged on the heating barrel 3, stirring blades 4 are arranged in the heating barrel 3, and a motor 1 and a speed reducer 2 are arranged at the top of the heating barrel; the water glass adding device calculates the mass of the added water glass required by the dry ore mass of the heating barrel, calculates the volume of the water glass according to the volume of the water glass, and the quantitative water glass enters the annular pipeline through the delivery pump under the measurement of the flow meter, and enters the bottom of the heating barrel through four pipelines with one-way valves at the bottom to react with gangue minerals in ore pulp, so that the effect of analyzing the gangue mineral surface collecting agent is achieved.
Example 3
A novel scheelite rough concentrate heating and reagent removal process is processed according to a sorting process shown in figure 1, and comprises the following steps:
(1) taking low-grade scheelite, grinding the scheelite to a particle size of less than 0.074mm which accounts for 65 percent to obtain ore pulp, adding a pH regulator, an inhibitor and a collector into the ore pulp, and performing a one-coarse-two-sweep flotation process to obtain coarse concentrate; whereinWO in the low-grade scheelite3The content of (A) is 0.0473%; the pH regulator is sodium carbonate, and the addition amount of 1t of raw ore is 1800 g; the inhibitor is water glass, and the addition amount of 1t of raw ore is 1000 g; the collecting agent is one or more of sodium aliphatate, oxidized paraffin and hydroximic acid, and the addition amount of 1t of raw ore is 240 g;
(2) pumping the rough concentrate obtained in the step (1) to a No. 1 thickener for concentration, discharging underflow ore pulp into a heating barrel, overflowing supernatant into a No. 2 thickener for secondary sedimentation, wherein the concentration of the concentrated ore pulp discharged by underflow is 70%, and the overflow concentration of supernatant is less than or equal to 5%;
(3) introducing steam into the ore pulp in the heating barrel in the step (2), keeping strong stirring, heating the ore pulp to 88 ℃, adding an inhibitor through the bottom of the heating barrel, continuously heating to 92 ℃ until the addition of the inhibitor in 1t of the coarse concentrate dry ore is 3kg, stopping introducing the steam, stirring strongly and keeping the temperature for 60 min;
(4) Standing and precipitating the ore pulp subjected to heat preservation in the step (3) in a heating barrel for 120min, and then extracting grease dissociated from the upper layer from the ore pulp, wherein the extraction amount of the grease on the upper layer is 10% of the total volume of the ore pulp;
(5) and (4) returning the grease extracted in the step (4) to the scheelite roughing section, feeding the ore pulp at the lower layer of the heating barrel into the scheelite dressing section, and performing one-roughing, two-refining and three-sweeping to obtain tungsten concentrate.
Further, in the step (3), water glass is injected from the bottom by using a water glass adding device, the water glass adding device comprises a water glass storage pool 11 and an annular pipeline 5, the annular pipeline 5 is arranged along the bottom of the heating barrel 3 in a surrounding way, and is inserted into the heating barrel 3, the annular pipeline 5 is connected with the water glass storage tank 11 through a delivery pipe, a water glass pumping pump 9 and a pressure gauge 8 are arranged on the conveying pipe at a position close to the water glass storage pool 11, a flowmeter 7 is arranged near the heating barrel 3, a one-way valve 6 is arranged at the inlet of the heating barrel 3 of the annular pipeline 5, a pipe clamp valve 10 is arranged between the water glass storage tank 11 and the water glass pumping pump 9, four check valves 6 are symmetrically arranged on the heating barrel 3, stirring blades 4 are arranged in the heating barrel 3, and a motor 1 and a speed reducer 2 are arranged at the top of the heating barrel; the water glass adding device calculates the mass of the added water glass required by the dry ore mass of the heating barrel, calculates the volume of the water glass according to the volume of the water glass, and the quantitative water glass enters the annular pipeline through the delivery pump under the measurement of the flow meter, and enters the bottom of the heating barrel through four pipelines with one-way valves at the bottom to react with gangue minerals in ore pulp, so that the effect of analyzing the gangue mineral surface collecting agent is achieved.
Comparative examples 1, 2 and 3 corresponding to examples 1, 2 and 3, respectively, were prepared by treating according to the sorting process shown in fig. 2:
comparative example 1
A novel scheelite rough concentrate heating and reagent removal process comprises the following steps:
(1) taking low-grade scheelite, grinding the scheelite to a particle size of less than 0.074mm which accounts for 55% to obtain ore pulp, adding a pH regulator, an inhibitor and a collecting agent into the ore pulp, and performing a one-coarse-two-sweep process to obtain coarse concentrate; wherein, the low-grade scheelite is WO3The content of (A) is 0.0473%; the pH regulator is sodium carbonate, and the addition amount of 1t of raw ore is 1200 g; the inhibitor is water glass, and the addition amount of 1t of raw ore is 600 g; the collecting agent is one or more of sodium aliphatate, oxidized paraffin and hydroximic acid, and the addition amount of 1t of raw ore is 180 g;
(2) conveying the rough concentrate obtained in the step (1) to a No. 1 thickener for concentration, discharging underflow ore pulp into a heating barrel, discharging supernatant liquor to enter a No. 2 thickener for secondary sedimentation, wherein the concentration of the concentrated ore pulp discharged by underflow is 70%, and the overflow concentration of the supernatant liquor is less than or equal to 5%;
(3) introducing steam into the ore pulp in the heating barrel in the step (2), keeping strong stirring, heating the ore pulp to 88 ℃, adding an inhibitor through the bottom of the heating barrel, wherein the addition amount of the inhibitor in 1t of coarse concentrate dry ore is 2.5kg, continuously heating to 92 ℃, stopping introducing the steam, stirring strongly and keeping the temperature for 30 min;
(4) And (4) adding clear water into the rough concentrate subjected to heat preservation in the step (3), adjusting the concentration to 25%, then entering a white tungsten fine separation section, and performing one-step rough two-step fine separation and three-step fine separation to obtain tungsten concentrate.
Further, in the step (3), water glass is injected from the bottom by using a water glass adding device, the water glass adding device comprises a water glass storage pool 11 and an annular pipeline 5, the annular pipeline 5 is arranged along the bottom of the heating barrel 3 in a surrounding way, and is inserted into the heating barrel 3, the annular pipeline 5 is connected with the water glass storage tank 11 through a delivery pipe, a water glass pumping pump 9 and a pressure gauge 8 are arranged on the conveying pipe at a position close to the water glass storage pool 11, a flowmeter 7 is arranged near the heating barrel 3, a one-way valve 6 is arranged at the inlet of the heating barrel 3 of the annular pipeline 5, a pipe clamp valve 10 is arranged between the water glass storage tank 11 and the water glass pumping pump 9, four check valves 6 are symmetrically arranged on the heating barrel 3, stirring blades 4 are arranged in the heating barrel 3, and a motor 1 and a speed reducer 2 are arranged at the top of the heating barrel; the water glass adding device calculates the mass of the added water glass required by the dry ore mass of the heating barrel, calculates the volume of the water glass according to the volume of the water glass, and the quantitative water glass enters the annular pipeline through the delivery pump under the measurement of the flow meter, and enters the bottom of the heating barrel through four pipelines with one-way valves at the bottom to react with gangue minerals in ore pulp, so that the effect of analyzing the gangue mineral surface collecting agent is achieved.
Comparative example 2
A novel scheelite rough concentrate heating and reagent removal process comprises the following steps:
(1) taking low-grade scheelite, grinding the scheelite to the particle size of below 0.074mm which accounts for 60 percent to obtain ore pulp, adding a pH regulator, an inhibitor and a collector into the ore pulp, and performing a one-coarse-two-sweep flotation process to obtain coarse concentrate;
(2) conveying the rough concentrate obtained in the step (1) to a No. 1 thickener for concentration, discharging underflow ore pulp into a heating barrel, discharging supernatant liquor to enter a No. 2 thickener for secondary sedimentation, wherein the concentration of the concentrated ore pulp discharged by underflow is 70%, and the overflow concentration of the supernatant liquor is less than or equal to 5%; wherein, the low-grade scheelite is WO3Of (1) containsThe amount was 0.0473%; the pH regulator is sodium carbonate, and the addition amount of 1t of raw ore is 1500 g; the inhibitor is water glass, and the addition amount of 1t of raw ore is 800 g; the collecting agent is one or more of sodium aliphatate, oxidized paraffin and hydroximic acid, and the addition amount of 1t of raw ore is 240 g;
(3) introducing steam into the ore pulp in the heating barrel in the step (2), keeping strong stirring, heating the ore pulp to 88 ℃, adding an inhibitor through the bottom of the heating barrel, continuously heating to 92 ℃ until the addition of the inhibitor in 1t of the coarse concentrate dry ore is 3kg, stopping introducing the steam, stirring strongly and keeping the temperature for 45 min;
(4) And (4) adding clear water into the rough concentrate after the heat preservation in the step (3), adjusting the concentration to 25%, entering a white tungsten fine separation section, and performing one-step rough two-step fine three-pass to obtain tungsten concentrate.
Further, in the step (3), water glass is injected from the bottom by using a water glass adding device, the water glass adding device comprises a water glass storage pool 11 and an annular pipeline 5, the annular pipeline 5 is arranged along the bottom of the heating barrel 3 in a surrounding way, and is inserted into the heating barrel 3, the annular pipeline 5 is connected with the water glass storage tank 11 through a delivery pipe, a water glass pumping pump 9 and a pressure gauge 8 are arranged on the conveying pipe at a position close to the water glass storage pool 11, a flowmeter 7 is arranged near the heating barrel 3, a one-way valve 6 is arranged at the inlet of the heating barrel 3 of the annular pipeline 5, a pipe clamp valve 10 is arranged between the water glass storage tank 11 and the water glass pumping pump 9, four check valves 6 are symmetrically arranged on the heating barrel 3, stirring blades 4 are arranged in the heating barrel 3, and a motor 1 and a speed reducer 2 are arranged at the top of the heating barrel; the water glass adding device calculates the mass of the added water glass required by the dry ore mass of the heating barrel, calculates the volume of the water glass according to the volume of the water glass, and the quantitative water glass enters the annular pipeline through the delivery pump under the measurement of the flow meter, and enters the bottom of the heating barrel through four pipelines with one-way valves at the bottom to react with gangue minerals in ore pulp, so that the effect of analyzing the gangue mineral surface collecting agent is achieved.
Comparative example 3
A novel scheelite rough concentrate heating and reagent removing process comprises the following steps:
(1) taking low-grade scheelite, grinding the scheelite to a particle size of less than 0.074mm which accounts for 65 percent to obtain ore pulp, adding a pH regulator, an inhibitor and a collector into the ore pulp, and performing a one-coarse-two-sweep flotation process to obtain coarse concentrate; wherein, the low-grade scheelite is WO3The content of (A) is 0.0473%; the pH regulator is sodium carbonate, and the addition amount of 1t of raw ore is 1800 g; the inhibitor is water glass, and the addition amount of 1t of raw ore is 1000 g; the collecting agent is one or more of sodium aliphatate, oxidized paraffin and hydroximic acid, and the addition amount of 1t of raw ore is 280 g;
(2) conveying the rough concentrate obtained in the step (1) to a No. 1 thickener for concentration, discharging underflow ore pulp into a heating barrel, discharging supernatant liquor to enter a No. 2 thickener for secondary sedimentation, wherein the concentration of the concentrated ore pulp discharged by underflow is 70%, and the overflow concentration of the supernatant liquor is less than or equal to 5%;
(3) introducing steam into the ore pulp in the heating barrel in the step (2), keeping strong stirring, heating the ore pulp to 88 ℃, adding an inhibitor through the bottom of the heating barrel, wherein the addition amount of the inhibitor in 1t of coarse concentrate dry ore is 3.5kg, continuously heating to 92 ℃, stopping introducing the steam, stirring strongly and keeping the temperature for 60 min;
(4) And (4) adding clear water into the rough concentrate after the heat preservation in the step (3), adjusting the concentration to 25%, entering a white tungsten fine separation section, and performing one-step rough two-step fine three-pass to obtain tungsten concentrate.
Further, in the step (3), water glass is injected from the bottom by using a water glass adding device, the water glass adding device comprises a water glass storage pool 11 and an annular pipeline 5, the annular pipeline 5 is arranged along the bottom of the heating barrel 3 in a surrounding way, and is inserted into the heating barrel 3, the annular pipeline 5 is connected with the water glass storage tank 11 through a delivery pipe, a water glass pumping pump 9 and a pressure gauge 8 are arranged on the conveying pipe at a position close to the water glass storage pool 11, a flowmeter 7 is arranged near the heating barrel 3, a one-way valve 6 is arranged at the inlet of the heating barrel 3 of the annular pipeline 5, a pipe clamp valve 10 is arranged between the water glass storage tank 11 and the water glass pumping pump 9, four check valves 6 are symmetrically arranged on the heating barrel 3, stirring blades 4 are arranged in the heating barrel 3, and a motor 1 and a speed reducer 2 are arranged at the top of the heating barrel; the water glass adding device calculates the mass of the added water glass required by the dry ore mass of the heating barrel, calculates the volume of the water glass according to the volume of the water glass, and the quantitative water glass enters the annular pipeline through the delivery pump under the measurement of the flow meter, and enters the bottom of the heating barrel through four pipelines with one-way valves at the bottom to react with gangue minerals in ore pulp, so that the effect of analyzing the gangue mineral surface collecting agent is achieved.
The grades and the recovery rates of the scheelite concentrates obtained in examples 1 to 3 and comparative examples 1 to 3 in each stage are shown in table 2:
TABLE 2 comparison of flotation index data
As can be seen from the results in the table above, the grade and recovery rate of each stage prepared by the sorting process adopted by the invention are higher.
The principal features, principles and advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to explain the principles of the invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the invention as expressed in the following claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A novel scheelite rough concentrate heating and reagent removing process is characterized by comprising the following steps:
(1) taking low-grade scheelite, grinding the scheelite until the granularity of the scheelite is less than 0.074mm accounts for 50-65% to obtain ore pulp, adding a pH regulator, an inhibitor and a collecting agent into the ore pulp, and performing a one-coarse-two-sweep flotation process to obtain coarse concentrate;
(2) conveying the rough concentrate obtained in the step (1) to a No. 1 thickener for concentration, discharging underflow ore pulp into a heating barrel, and overflowing supernatant into a No. 2 thickener for secondary sedimentation;
(3) Introducing steam into the ore pulp in the heating barrel in the step (2), keeping strong stirring, heating the ore pulp to 86-88 ℃, adding an inhibitor into the bottom of the heating barrel, continuously heating to 90-92 ℃, stopping introducing the steam, stirring strongly and keeping the temperature for 30-60 min;
(4) standing and precipitating the ore pulp subjected to heat preservation in the step (3) in a heating barrel for 60-120 min, and then extracting grease dissociated from the upper layer from the ore pulp;
(5) returning the grease extracted in the step (4) to the scheelite roughing section, feeding the ore pulp at the lower layer of the heating barrel into the scheelite dressing section, and performing one-roughing, two-refining and three-sweeping to obtain tungsten concentrate;
in the step (1), WO in the low-grade scheelite3The content of (A) is 0.03-0.12%; the pH regulator is sodium carbonate, and the addition amount of the pH regulator in 1t of raw ore is 1200-2100 g; the inhibitor is water glass, and the addition amount of 1t of raw ore is 0-1000 g; the collecting agent is one or more of sodium aliphatate, oxidized paraffin and hydroximic acid, and the addition amount of 1t of raw ore is 120-350 g;
in the step (3), water glass is injected from the bottom by using a water glass adding device, the water glass adding device comprises a water glass storage pool and an annular pipeline, the annular pipeline is arranged around the bottom of the heating barrel and is inserted into the heating barrel, the annular pipeline is connected with the water glass storage pool through a conveying pipe, a water glass pumping pump and a pressure gauge are arranged on the conveying pipe close to the water glass storage pool, a flow meter is arranged close to the heating barrel, and a check valve is arranged at the inlet of the annular pipeline at the heating barrel.
2. The novel scheelite rough concentrate heating and reagent removal process according to claim 1, wherein in the step (2), the concentration of the concentrated ore pulp discharged from the underflow is 65-75%, and the overflow concentration of the supernatant is less than or equal to 5%.
3. The novel scheelite rough concentrate heating and reagent removal process according to claim 1, wherein in the step (3), the addition amount of the inhibitor in 1t of rough concentrate dry ore is 2-4 kg.
4. The novel scheelite rough concentrate heating and reagent removal process according to claim 1, wherein in the step (4), the extraction amount of the upper layer grease is 5-10% of the total volume of the ore pulp.
5. The novel scheelite rough concentrate heating and reagent removal process according to claim 1, wherein four check valves are symmetrically arranged on the heating barrel, and a pipe clamp valve is arranged between the water glass storage tank and the water glass pumping pump.
6. The novel scheelite rough concentrate heating and reagent removing process according to claim 1, wherein a stirring blade is arranged in the heating barrel, and a motor and a speed reducer are arranged at the top of the heating barrel.
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| GB1041547A (en) * | 1964-06-11 | 1966-09-07 | Exxon Research Engineering Co | Improvements in the treatment of coal and other minerals |
| CN202933787U (en) * | 2012-11-08 | 2013-05-15 | 湖南鑫源矿业有限公司 | Preparation device of efficient inhibitor for fluorite mineral flotation |
| CN103846165A (en) * | 2012-11-28 | 2014-06-11 | 沈阳铝镁设计研究院有限公司 | Beneficiation reagent adding method and device |
| CN103386372B (en) * | 2013-08-08 | 2015-03-11 | 中冶北方（大连）工程技术有限公司 | Bottom agent-adding device for flotation machine |
| CN105289848B (en) * | 2015-10-26 | 2017-11-07 | 浙江工业大学 | A kind of method for floating of fluorite |
| CN106000655B (en) * | 2016-06-08 | 2018-05-15 | 江西理工大学 | A kind of method of selected scheelite under room temperature |
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