Normal-temperature efficient recovery method for low-grade tungsten in gold, antimony and tungsten multi-metal symbiotic ore

Abstract

The invention discloses a normal-temperature efficient recovery method for low-grade tungsten in gold, antimony and tungsten multi-metal symbiotic ore. The method comprises the steps that raw ore is ground and then subjected to shaking table reselection, reselected concentrate, reselected middling and reselected tailings are obtained, foam flotation is conducted on the reselected middling, sulfide ore is floated out, coarse-grain tungsten minerals are recycled through reselection of the flotation tailings, ore grinding is conducted on the reselected tailings, gold and antimony bulk flotation is conducted, then scheelite flotation and tungsten concentrate flotation are conducted under the action of a combined collecting agent, and finally tungsten concentrate is obtained. According to the method, aiming at the characteristic that the granularity of the tungsten mineral in the gold-antimony-tungsten symbiotic ore is uneven in thickness distribution, a proper ore grinding separation process and proper ore grinding fineness are selected, the tungsten mineral is prevented from being over-crushed, and underground wastewater is reasonably utilized, so that the use amount of clear water is effectively reduced, and meanwhile, the underground wastewater is recycled; furthermore, an ore pulp heating process is omitted in the tungsten ore concentration stage, the fuel cost is greatly reduced, and therefore the production cost is greatly reduced on the premise that the tungsten concentrate recovery rate is guaranteed.

Description

Technical Field

[0001] The present invention relates to a tungsten recovery method, in particular to a room-temperature high-efficiency recovery method for low-grade tungsten in a polymetallic ore containing gold, antimony and tungsten, and belongs to the technical field of room-temperature smelting. Background Art

[0002] Tungsten ore is an important metal mineral with extensive applications in modern industry. Tungsten flotation is one of the key methods for separating and enriching tungsten from tungsten-containing ores. During the development and utilization of tungsten resources, ore grade has gradually declined with continued mining, and the number of complex and difficult-to-process ores has increased, placing higher demands on mineral processing technology.

[0003] The tungsten grade in gold-antimony-tungsten co-existing ores is relatively low, and the feed grade of the gravity separation tailings entering flotation is only approximately 0.1%. Existing ore processing plants utilize a two-stage grinding and gravity flotation process. The first stage of grinding utilizes a ball mill and a linear screen in a closed-circuit grinding process. The ore is then subjected to a shaking table gravity separation process below the linear screen to produce gravity separation concentrate, gravity separation medium, and gravity separation tailings. The gravity separation concentrate is then refined to obtain mixed gold. The gravity separation medium is then subjected to trough flotation to separate stibnite and gold-bearing minerals. The trough flotation tailings are then subjected to shaking table gravity separation to obtain gravity separation tungsten concentrate and tailings. After re-grinding, the shaking table gravity separation tailings are first subjected to gold-antimony mixed flotation to produce a gold-antimony mixed concentrate. The gold-antimony mixed flotation tailings are then used to flot scheelite. However, in the above process, although the recovery rate of tungsten in low-grade tungsten ore can be improved, the slurry temperature needs to be kept above 90°C during the slurry analysis process in the selection section, which results in large heat consumption and high fuel costs. In addition, there are large amounts of sludge and associated ores in the paragenetic ore, which makes flotation more difficult after the recovery of coarse-grained tungsten minerals.

[0004] In addition, during the dry season, water supply in the mining area is tight and production may be suspended due to water shortage. However, the mining of ore will generate a large amount of underground wastewater. Since the suspended solids, COD, arsenic and antimony content in these wastewaters exceed the standard, they have a great impact on the flotation of scheelite. Not only are they difficult to be effectively utilized, but they also need to be further processed before they can be discharged, further increasing the process cost. Summary of the Invention

[0005] In response to the problems existing in the prior art, the present invention aims to provide a method for efficiently recovering low-grade tungsten from gold, antimony, and tungsten polymetallic ores at room temperature. This method addresses the uneven distribution of tungsten ore particles in gold, antimony, and tungsten ores. By selecting an appropriate grinding and separation process and grinding fineness, the method avoids over-crushing of the tungsten ore. Through the rational use of underground wastewater, the method effectively reduces clean water consumption and enables its reuse. Furthermore, during the tungsten ore concentration stage, a combined collector is used to enrich the low-grade ore at room temperature, eliminating the slurry heating process and significantly reducing fuel costs. This significantly reduces production costs while ensuring the recovery rate of tungsten concentrate.

[0006] In order to achieve the above technical objectives, the present invention provides a method for efficiently recovering low-grade tungsten from a polymetallic ore containing gold, antimony and tungsten at room temperature, comprising:

[0007] 1) After the raw ore is ground once, it is subjected to a shaking table gravity separation to obtain gravity separation concentrate, gravity separation ore and gravity separation tailings. The gravity separation concentrate is sequentially subjected to a shaking table gravity separation and acid leaching to remove impurities to obtain gold concentrate and gold concentrate tailings;

[0008] 2) The gravity separation medium and the gold concentrate tailings are subjected to shaking table gravity separation together, the obtained concentrate is mixed with the gravity separation concentrate in step 1), the obtained tailings are subjected to trough flotation roughing separation to obtain gold-antimony rough concentrate and roughing tailings, the gold-antimony rough concentrate is subjected to trough flotation roughing separation to obtain trough flotation antimony gold concentrate, the roughing tailings are subjected to scavenging separation to obtain scavenging concentrate and scavenging tailings, the tailings and scavenging concentrate obtained from the 1-2 concentration processes are returned to the roughing separation again, and the scavenging tailings are subjected to shaking table gravity separation to obtain gravity tungsten concentrate and gravity tungsten concentrate tailings;

[0009] 3) The gravity separation tailings and the gravity separation tungsten concentrate tailings are mixed and then subjected to secondary grinding and antimony flotation roughing to obtain antimony flotation roughing concentrate and antimony flotation roughing tailings. The antimony flotation roughing concentrate is sequentially subjected to concentrating in sections I to III. The concentrated concentrate in section III is flotation antimony-gold concentrate. The concentrated tailings in sections I to III are returned to the previous section for circulation. The antimony flotation roughing tailings are subjected to scavenging in sections I to III. The scavenging concentrate in sections I to III is returned to the previous section for circulation. The scavenging tailings in section III are antimony-gold flotation tailings.

[0010] 4) After the antimony-gold flotation tailings undergo roughing operation in the scheelite rougher flotation section, scheelite rougher concentrate and rougher tailings are obtained. The obtained scheelite rougher concentrate is subjected to two rounds of cleaning to obtain flotation tungsten rougher concentrate. The obtained rougher tailings are subjected to three rounds of scavenging to obtain flotation tungsten tailings.

[0011] 5) After analytical treatment, the flotation rough concentrate is sent to the processing flotation section for roughing operation to obtain rougher concentrate and rougher tailings. The rougher concentrate is subjected to four rounds of cleaning to obtain tungsten concentrate. The rougher tailings are subjected to two rounds of scavenging to obtain processing flotation tailings. The processing flotation tailings are classified by a cyclone, and the classified sand is returned to the first round of cleaning of the scheelite rough flotation section. The overflow of the cyclone is returned to the roughing operation of the scheelite rough flotation section.

[0012] As a preferred solution, in the recovery method, clean water is used in the two beneficiation processes and the analytical and beneficiation processes of the concentrate obtained after the roughing operation of the scheelite flotation stage, and the water used in the remaining processes is underground wastewater.

[0013] As a preferred solution, the clean water accounts for ≤10% of the total water consumption by mass.

[0014] Most of the processes in the method provided by the present invention use underground wastewater. Since underground wastewater contains a large amount of calcium, magnesium ions and heavy metal ions, it will interfere with the interaction between flotation reagents and target minerals. In addition, the solid particles contained in it will increase the viscosity and density of the slurry, affecting the generation and floating of bubbles. Therefore, in traditional processes, underground wastewater cannot be directly used for ore flotation production. However, the present invention uses different types of flotation reagents to significantly reduce the impact of underground wastewater on the gold and antimony flotation section. In addition, in the roughing stage of scheelite, a strongly alkaline pH adjuster II is used, and OH is used to adjust the pH of the scheelite. - Ions reduce the content of calcium and magnesium ions in underground wastewater, thereby reducing the consumption of collectors. In addition, the temperature of underground wastewater is stable all year round and does not fluctuate much, and the recovery rate of tungsten ore can be guaranteed even in the low temperature stage in winter.

[0015] As a preferred solution, during the flotation roughing, 80-120 g / t of inhibitor I, 1000-1200 g / t of pH regulator I, 200-260 g / t of collector I and 60-100 g / t of frother I are added in sequence, based on the dry weight of the middlings.

[0016] As a preferred solution, the inhibitor I is fluorosilicate.

[0017] As a preferred solution, the pH regulator I is sulfuric acid and / or hydrochloric acid.

[0018] As a preferred solution, the collector I is MA-3.

[0019] As a preferred solution, the foaming agent I is RB3.

[0020] As a preferred solution, during the antimony flotation roughing, 100-120 g / t of activator, 150-200 g / t of collector and 20-40 g / t of foaming agent I are added based on the dry weight of the tailings.

[0021] As a preferred solution, the activator is copper sulfate and lead nitrate, and the mass ratio of the two is 0.8 to 1:1.

[0022] As a preferred solution, the collector is MA-3 and sodium butadiene black medicine, and the mass ratio of the two is 4 to 6:1.

[0023] As a preferred solution, the scheelite coarse flotation section further needs to add 1300-1500 g / t pH adjuster II, 800-1000 g / t inhibitor II and 160-240 g / t combined collector based on the dry weight of the antimony-gold flotation tailings.

[0024] As a preferred solution, the combined collector II comprises the following components in parts by mass: 8 to 10 parts of ZL, 3 to 5 parts of 731 and 1 to 2 parts of oleic acid.

[0025] As a preferred solution, the pH adjuster II is an 8-12 wt% soda ash and / or caustic soda solution. When the pH adjuster II is a mixed solution of soda ash and caustic soda, the mass ratio of the two, calculated as solutes, is 4-6:1.

[0026] As a preferred solution, the inhibitor II is water glass with a modulus of 2.5 to 2.8.

[0027] As a preferred solution, the process of analytical treatment of the scheelite crude concentrate is as follows: based on the dry weight of the tungsten crude concentrate, 40-50 kg / t of water glass with a modulus of 2.5-2.8 and a Baume degree of 48-52 is added, and the solution is stirred and analyzed at 250-300 r / min for 40-60 minutes. After the analysis is completed, the solution is diluted to a mass concentration of 15-25%.

[0028] Compared with the prior art, the beneficial technical solutions of the technical solution of the present invention are:

[0029] 1) The room-temperature efficient recovery method provided by the present invention targets the uneven distribution of tungsten minerals, controls the mineral particle size, dissociates most of the coarse-grained tungsten minerals, and recovers them by gravity separation, thereby achieving the purpose of early recovery and high recovery. By rationally utilizing underground wastewater, the amount of clean water used is effectively reduced, and the reuse of underground wastewater is achieved. Furthermore, in the tungsten ore selection stage, a combined collector is used to enrich low-grade ores at room temperature, eliminating the slurry heating process, greatly reducing fuel costs, and thus significantly reducing production costs while ensuring the recovery rate of tungsten concentrate.

[0030] 2) In the technical solution provided by the present invention, the selected tailings from the tungsten processing flotation section are concentrated and returned, which can effectively avoid the influence of the selection effect caused by the large amount of sludge and gangue minerals in the selected tailings, which leads to the inclusion of sludge and high gangue content in the concentrate foam. The processing flotation tailings have a high sediment concentration and contain a large amount of tungsten. The use of cyclone classification will enable the tungsten minerals that are not recovered in time in the processing flotation operation to enter the coarse concentrate product more quickly, which can effectively reduce the final tailings grade and improve the recovery rate.

[0031] 3) Among the combined collectors used in the technical solution provided by the present invention, ZL has good selectivity and good solubility and dispersion properties under low temperature conditions. The 731 collector is relatively inexpensive and has good selectivity. It has strong oleic acid capture ability. Under a specific combination ratio, a solution with optimal capture ability, selectivity and reagent cost is obtained, achieving the highest overall benefit. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 1 is a process flow chart of the shaking table gravity separation process in Example 1 of the present invention;

[0033] Figure 2 1 is a process flow chart of the antimony-gold flotation process in Example 1 of the present invention;

[0034] Figure 3 This is a process flow chart of the tungsten ore flotation process in Example 1 of the present invention. DETAILED DESCRIPTION

[0035] In order to facilitate understanding of the present invention, the present invention will be described more comprehensively and meticulously below in conjunction with preferred embodiments, but the protection scope of the present invention is not limited to the following specific embodiments.

[0036] Unless otherwise defined, all technical terms used hereinafter have the same meanings as those generally understood by those skilled in the art. The technical terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention.

[0037] Example 1

[0038] This example depicts gold, antimony, and tungsten co-existing ore from a state-owned subsidiary in Hunan. Before the project, the inlet grades at the concentrator were 3.8g / t Au, 1.2% Sb, and 0.155% WO3. Using existing thermal concentrating and thermal aeration processes, the tailings yielded 0.39g / t Au, 0.039% Sb, and 0.039% WO3, with actual recoveries of 89.7% Au, 96.78% Sb, and 72.5% WO3.

[0039] This embodiment provides a method for efficiently recovering low-grade tungsten from a polymetallic ore containing gold, antimony, and tungsten at room temperature. The specific process is as follows:

[0040] 1) Shaking table gravity separation process

[0041] Take the raw ore, grind it to -0.074mm, accounting for 50%, and then use the shaking table to re-select to obtain gravity gold concentrate, gravity middlings, and gravity tailings. After the shaking table gravity gold concentrate is carefully selected, the gold concentrate is obtained.

[0042] The ore from the shaking table gravity separation is fed into the flotation tank. 100g / t of fluorosilicate, 1200g / t of sulfuric acid, 240g / t of MA-3, and 80g / t of frother are added in sequence based on the dry weight of the ore. The roughing separation produces gold-antimony rough concentrate and roughing tailings. The roughing tailings are scavenged to produce scavenged concentrate and scavenged tailings. The scavenged concentrate is returned to the roughing separation, and the scavenged tailings are the flotation tailings. The roughing concentrate is then cleaned to produce concentrated I concentrate and concentrated I tailings. The concentrated I tailings are returned to the roughing separation, and the concentrated I concentrate is the final antimony-gold concentrate I.

[0043] The tailings from the flotation tank are subjected to shaker table gravity separation to separate tungsten minerals from quartz and other gangue minerals. The product is a mixed concentrate of scheelite and wolframite.

[0044] 2) Antimony-gold flotation process

[0045] The shaking table gravity separation tailings are combined with the flue flotation table tailings and gold concentrate tailings, ground to -0.074mm and reaching 83%. Water is then added to adjust the pulp concentration to 35% by weight. Based on the dry weight of the tailings, 50g / t of copper sulfate activator, 60g / t of lead nitrate, 125g / t of MA-3 collector, 25g / t of sodium butyrate, and 30g / t of frother are added. The gold-antimony mixed flotation roughing process is then carried out to obtain a flotation antimony-gold roughing concentrate and roughing tailings.

[0046] The rougher tailings are treated with 20g / t copper sulfate, 50g / t collector IIMA-3, and 10g / t sodium butyrate. The flotation process produces scavenging I concentrate and tailings, which are then returned to the rougher process. The scavenging I tailings are treated with 20-40g / t collector II. The flotation process produces scavenging II concentrate and tailings, which are then returned to the rougher process. The scavenging II tailings are subjected to a blank flotation process to produce scavenging III concentrate and tailings. Scheelite is then flotated from the scavenging III tailings, which are then returned to the scavenging II process.

[0047] The antimony-gold rougher concentrate is refined to produce Selected I concentrate and Selected I tailings. The Selected I tailings are regrinded to -0.038mm, accounting for 85%, and then combined with the shaker tailings for roughing. The Selected I concentrate is refined to produce Selected II concentrate and Selected II tailings. Based on the dry weight of the tailings, 100g / t of acidified water glass is added to the Selected II tailings and returned to the Selected I process. The Selected II concentrate is refined to produce Selected III concentrate and Selected III tailings. The Selected III tailings are then added with 60g / t of acidified water glass and returned to the Selected II process. The Selected III concentrate is the Antimony-Gold Concentrate II. The grade of the Antimony-Gold Concentrate II is 75.8g / t Au, 32.5% Sb, 12.8% SiO2, and 0.062% WO3.

[0048] 3) Tungsten ore flotation process

[0049] Add 1440 g / t of pH adjuster II to the floating antimony tailings to adjust the pH value to 9.3, add 700 g / t of inhibitor II, and add 80 g / t of combined collector, wherein the pH adjuster II is a mixed solution of sodium hydroxide and soda ash in a weight ratio of 1:5, and the concentration of the mixed solution is 5%, the inhibitor II is water glass with a modulus of 2.5-2.7 and a Baume degree of 48-52, and the combined collector is composed of ZL, 731, and oleic acid in a weight ratio of 8:4:1;

[0050] Rough flotation obtains tungsten rougher concentrate and rougher tailings. The tungsten rougher concentrate is blank-floted once to obtain Concentrated I concentrate and Concentrated I tailings. The Concentrated I concentrate is blank-floted once again to obtain scheelite rougher concentrate and Concentrated II tailings. The Concentrated II tailings are returned to Concentrated I, and the Concentrated I tailings are returned to the rougher.

[0051] A combined collector of 60 g / t was added to the roughing tailings, and flotation was performed to obtain scavenging I concentrate and scavenging I tailings. The scavenging I concentrate was returned to the roughing. A combined collector of 60 g / t was added to the scavenging I tailings, and flotation was performed to obtain scavenging II concentrate and scavenging II tailings. The scavenging II concentrate was returned to scavenging I. The scavenging II tailings were subjected to blank flotation to obtain scavenging III concentrate and scavenging III tailings. The scavenging III tailings were the final tailings.

[0052] The scheelite crude concentrate is added with 45kg / t of water glass with a modulus of 2.5-2.7 and a Baume degree of 48-52 according to the dry ore amount, and is subjected to high-intensity analysis in a stirring barrel at a speed of 260r / min for 45 minutes. The analyzed crude concentrate is diluted to a weight percentage concentration of 18-20%, and flotation is performed to obtain processing flotation rougher concentrate and rougher tailings. The rougher concentrate is flotated to obtain concentrated I concentrate and concentrated I tailings. The concentrated I concentrate is flotated to obtain concentrated II concentrate and concentrated II tailings. The concentrated II concentrate is flotated to obtain concentrated III concentrate and concentrated III tailings. The concentrated III concentrate is again refined to obtain concentrated IV concentrate and concentrated IV tailings. The concentrated IV tailings are returned to concentrated III. The concentrated IV concentrate is the final scheelite flotation concentrate. The selected I tailings, selected I tailings, and selected I tailings are combined and returned to the processing flotation roughing. The roughing tailings are floated to obtain scavenging I concentrate and scavenging I tailings. The scavenging I concentrate is returned to the processing flotation roughing. The scavenging I tailings are floated to obtain scavenging II concentrate and processing flotation tailings. The scavenging II concentrate is returned to the Selected II of the scheelite rough flotation section. The processing flotation tailings are classified by a cyclone, and the classified sand is returned to the Selected I of the scheelite rough flotation section. The cyclone overflow is returned to the roughing operation of the scheelite rough flotation section.

[0053] After testing, using the process provided in this embodiment, the tailings obtained have a grade of Au 0.39 g / t, Sb 0.038%, and WO3 0.038%, and the actual recovery rates of the three metals are Au 89.75%, Sb 96.9%, and WO3 75.15%. Compared with the original process, the recovery rate of each metal in the raw ore has been improved. In addition, the original process required heating the scheelite crude concentrate to 95°C, with a crude concentrate yield of 4.3%. 8.15 kg of steam was required to process each ton of raw ore, and 115 liters of diesel were required to produce 1 ton of steam. The unit price of diesel was 7.1 yuan / liter, and the fuel cost per ton of raw ore was 115 liters / ton × 7.1 yuan / liter × 8.15 / 1000 = 6.65 yuan. The mineral processing plant processed 350,000 tons of raw ore annually, and the original process required a fuel cost of 2.3275 million yuan. After switching to room temperature flotation, the crude concentrate did not need to be heated, which improved the working environment. In addition, 90% of the production water used in this process was underground wastewater, which greatly reduced the amount of clean water used while realizing the resource utilization of wastewater.

Claims

1. A method for efficiently recovering low-grade tungsten from polymetallic ore of gold, antimony and tungsten at room temperature, characterized in that: include: 1) After the raw ore is ground once, it is subjected to a shaking table gravity separation to obtain gravity separation concentrate, gravity separation ore and gravity separation tailings. The gravity separation concentrate is sequentially subjected to a shaking table gravity separation and acid leaching to remove impurities to obtain gold and gold concentrate tailings; 2) The gravity separation medium and the gold concentrate tailings are subjected to shaking table gravity separation together, the obtained concentrate is mixed with the gravity separation concentrate in step 1), the obtained tailings are subjected to trough flotation roughing separation to obtain gold-antimony rough concentrate and roughing tailings, the gold-antimony rough concentrate is subjected to trough flotation roughing separation to obtain trough flotation antimony gold concentrate, the roughing tailings are subjected to scavenging separation to obtain scavenging concentrate and scavenging tailings, the tailings and scavenging concentrate obtained from the 1-2 concentration processes are returned to the roughing separation again, and the scavenging tailings are subjected to shaking table gravity separation to obtain gravity tungsten concentrate and gravity tungsten concentrate tailings; 3) The gravity separation tailings and the gravity separation tungsten concentrate tailings are mixed and then subjected to secondary grinding and antimony flotation roughing to obtain antimony flotation roughing concentrate and antimony flotation roughing tailings. The antimony flotation roughing concentrate is sequentially subjected to concentrating in sections I to III. The concentrated concentrate in section III is flotation antimony-gold concentrate. The concentrated tailings in sections I to III are returned to the previous section for circulation. The antimony flotation roughing tailings are subjected to scavenging in sections I to III. The scavenging concentrate in sections I to III is returned to the previous section for circulation. The scavenging tailings in section III are antimony-gold flotation tailings. 4) After the antimony-gold flotation tailings undergo roughing operation in the scheelite rougher flotation section, scheelite rougher concentrate and rougher tailings are obtained. The obtained scheelite rougher concentrate is subjected to two rounds of cleaning to obtain flotation tungsten rougher concentrate. The obtained rougher tailings are subjected to three rounds of scavenging to obtain flotation tungsten tailings. 5) After analytical treatment, the flotation rough concentrate is sent to the processing flotation section for roughing operation to obtain rougher concentrate and rougher tailings. The rougher concentrate is subjected to four rounds of cleaning to obtain tungsten concentrate. The rougher tailings are subjected to two rounds of scavenging to obtain processing flotation tailings. The processing flotation tailings are classified by a cyclone, and the classified sand is returned to the first round of cleaning of the scheelite rough flotation section. The overflow of the cyclone is returned to the roughing operation of the scheelite rough flotation section.

2. The method for efficiently recovering low-grade tungsten from a polymetallic ore of gold, antimony and tungsten at room temperature according to claim 1, characterized in that: In the recovery method, clean water is used in the two beneficiation processes and the analytical treatment process of the concentrate obtained after the rough selection of scheelite, and water used in the remaining processes is underground wastewater; the clean water accounts for ≤10% of the total water consumption.

3. The method for efficiently recovering low-grade tungsten from a polymetallic ore of gold, antimony and tungsten at room temperature according to claim 1, characterized in that: During the flotation roughing, 80-120 g / t of inhibitor I, 1000-1200 g / t of pH regulator I, 200-260 g / t of collector I and 60-100 g / t of frother I are added in sequence based on the dry weight of the middlings.

4. The method for efficiently recovering low-grade tungsten from polymetallic ore at room temperature according to claim 3, characterized in that: The inhibitor I is fluorosilicate; the pH adjuster I is sulfuric acid and / or hydrochloric acid; the collector I is MA-3; and the foaming agent I is RB3.

5. The method for efficiently recovering low-grade tungsten from a polymetallic ore of gold, antimony and tungsten at room temperature according to claim 1, characterized in that: During the antimony flotation roughing, 100-120 g / t of activator, 150-200 g / t of collector and 20-40 g / t of foaming agent I need to be added based on the dry weight of the tailings.

6. The method for efficiently recovering low-grade tungsten from a polymetallic ore of gold, antimony and tungsten at room temperature according to claim 5, characterized in that: The activator is copper sulfate and lead nitrate, and the mass ratio of the two is 0.8-1:1; the collector is MA-3 and sodium butadiene black medicine, and the mass ratio of the two is 4-6:1; the foaming agent I is RB3.

7. The method for efficiently recovering low-grade tungsten from a polymetallic ore of gold, antimony and tungsten at room temperature according to claim 1, characterized in that: The scheelite roughing also needs to add 1300-1500 g / t of pH adjuster II, 700-1000 g / t of inhibitor II and 160-240 g / t of combined collector based on the dry weight of antimony-gold flotation tailings.

8. The method for efficiently recovering low-grade tungsten from a polymetallic ore of gold, antimony and tungsten at room temperature according to claim 7, characterized in that: The combined collector comprises the following components in parts by mass: 8 to 10 parts of ZL, 3 to 5 parts of 731 and 1 to 2 parts of oleic acid.

9. The method for efficiently recovering low-grade tungsten from a polymetallic ore of gold, antimony and tungsten at room temperature according to claim 7, characterized in that: The pH adjuster II is an 8-12 wt% soda ash and / or caustic soda solution. When the pH adjuster II is a mixed solution of soda ash and caustic soda, the mass ratio of the two, calculated as solutes, is 4-6:

1. The inhibitor II is water glass with a modulus of 2.5-2.

8.

10. The method for efficiently recovering low-grade tungsten from a polymetallic ore of gold, antimony and tungsten at room temperature according to claim 1, characterized in that: The analytical treatment process of the tungsten crude concentrate is as follows: based on the dry weight of the tungsten crude concentrate, 40-50 kg / t of water glass with a modulus of 2.5-2.8 and a Baume degree of 48-52 is added, and the solution is stirred and analyzed at 250-300 r / min for 40-60 minutes. After the analysis is completed, the solution is diluted to a mass concentration of 15-25%.

Images