Efficient non-toxic beneficiation method for improving molybdenum-bismuth-sulfur separation index

Abstract

The invention discloses an efficient non-toxic beneficiation method for improving molybdenum-bismuth-sulfur separation indexes, which comprises the following steps: concentrating a full flotation concentrate sample and a molybdenum-bismuth-sulfur mixed sample until the concentration is 30% and the ratio of the concentration to the molybdenum-bismuth-sulfur mixed sample to the fineness of-0.074 mm is 80-95% to serve as molybdenum-bismuth-sulfur separation feed ore; according to the method, the sulfur-inhibiting agent T-706 is used for achieving non-toxicity in the molybdenum-bismuth-sulfur separation process, kerosene is used as a foam regulator in the molybdenum-bismuth-sulfur separation process, the process stability is improved, meanwhile, the use of a collecting agent N, N '-diethyldithiocarbamate and activated carbon in a reagent removal link is omitted, and the labor intensity of operators is greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of ore dressing, and in particular to an efficient and non-toxic ore dressing method for improving molybdenum, bismuth and sulfur separation indicators. Background Art

[0002] Molybdenum is an indispensable metal material in the steel industry. Due to its low density and high strength, it is widely used in alloy manufacturing, electronic device manufacturing, and chemical industry. Bismuth has stable chemical properties and a low melting point. It is widely used in fusible alloy manufacturing, chemical industry, semiconductors, etc. my country has abundant reserves of molybdenum and bismuth, and molybdenum and bismuth are generally coexistent. Since the floatability of molybdenum and bismuth sulfide ores is similar, the separation of molybdenum and bismuth sulfide ores is still a difficult problem.

[0003] Most of my country's molybdenum sulfide and bismuth sulfide mines generally have pyrite, and molybdenum, bismuth and pyrite coexist closely and have complex embedding characteristics, resulting in unsatisfactory separation indicators of molybdenum, bismuth and sulfur. Lime and sodium cyanide are commonly used inhibitors of pyrite. The sulfur inhibition effect of lime alone is not very good, and sodium cyanide is highly toxic and difficult to control during the production process. The safety risks are extremely high. Therefore, the development of new molybdenum, bismuth and sulfur separation flotation methods is the focus of current research.

[0004] The main problems of existing molybdenum, bismuth and sulfur recovery include high labor intensity in the flotation dosing process, poor flotation operating environment, high operating cost, unstable flotation process operation, too low flotation concentrate indicators, and the highly toxic flotation agent sodium cyanide, etc. Therefore, we propose an efficient and non-toxic molybdenum, bismuth and sulfur recovery method. Summary of the invention

[0005] In view of the defects of the prior art, the purpose of the present invention is to provide a highly efficient and non-toxic beneficiation method for improving the separation index of molybdenum, bismuth and sulfur, so as to solve the problems raised in the above background technology.

[0006] The present invention solves the technical problem by adopting the following technical solution:

[0007] The present invention provides a highly efficient and non-toxic beneficiation method for improving the separation index of molybdenum, bismuth and sulfur, comprising the following steps:

[0008] Step 1: Concentrate the whole flotation concentrate sample and the molybdenum, bismuth and sulfur mixed sample to a concentration of 30%, with a fineness of -0.074mm accounting for 80-95%, as the molybdenum, bismuth and sulfur separation feed ore;

[0009] Step 2: add lime and kerosene to the ore sample in step 1 in sequence, stir thoroughly, then add non-toxic sulfur inhibitor and continue stirring for a period of time to separate molybdenum, bismuth and sulfur, the dosage of combined inhibitor is 10-60kg / t, foam regulator is 10-150g / t, sulfur inhibitor is 0.5-3kg / t, silicon inhibitor is 0.5-3kg / t, and molybdenum-bismuth mixed rough concentrate and rough tailings are obtained;

[0010] Step 3: Separate and scavenge the roughing tailings sample obtained in step 2. The tailings are sulfur concentrates, and perform three blank scavenge selections;

[0011] Step 4: The molybdenum-bismuth mixed rough concentrate obtained in step 2 is beneficiated three times to obtain a molybdenum-bismuth mixed concentrate, wherein the amount of the combined inhibitor of concentrate 1 is 2-15kg / t, the amount of the sulfur inhibition agent is 0.2-1.5kg / t, the amount of the combined inhibitor of concentrate 2 is 0-8kg / t, the amount of the sulfur inhibition agent is 0-0.5kg / t, the amount of the combined inhibitor of concentrate 3 is 0-4kg / t, and the amount of the sulfur inhibition agent is 0-0.2kg / t;

[0012] Step 5: Separate and roughly select the molybdenum and bismuth mixed concentrate obtained in step 4, add 30-90 kg / t of inhibitor and 30-200 g / t of foam regulator to obtain rough molybdenum concentrate and rough tailings;

[0013] Step 6: beneficiating the molybdenum rough concentrate obtained in step 5 to obtain molybdenum concentrate, adding 20-60kg / t of inhibitor to concentrate 1, 10-40kg / t of inhibitor to concentrate 2, 0-100g / t of foam regulator, and 0-20kg / t of inhibitor to concentrate 3;

[0014] Step 7: The rough tailings obtained in step 5 are subjected to molybdenum-bismuth separation scavenging. The tailings are bismuth concentrate, and two blank scavengings are performed.

[0015] Preferably, in step 1, the concentration of the fully floated concentrate sample is 30%, and the fineness of -0.074 mm accounts for 80-95%.

[0016] Preferably, in step 2, the combined inhibitor is lime, the foam regulator is kerosene, the sulfur inhibitor is T-70, and the silicon inhibitor is water glass.

[0017] Preferably, in step 4, the combined inhibitor is lime and the sulfur inhibitor is T-706.

[0018] Preferably, in step 5, the inhibitor is sodium sulfide and the foam regulator is kerosene.

[0019] Preferably, in step six, the inhibitor is sodium sulfide and the foam regulator is kerosene.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The main purpose of the present invention is to solve a series of problems such as the instability of the molybdenum, bismuth and sulfur separation process, the excessive toxicity of the reagents, the high production cost, and the unsatisfactory concentrate indicators. In the molybdenum, bismuth and sulfur desulfurization process, the use of activated carbon in the traditional flotation de-drug link is eliminated, and the highly toxic sulfur-inhibiting agent sodium cyanide in the traditional flotation is replaced by the highly efficient and non-toxic sulfur-inhibiting agent T-706 and lime to form a combined inhibition effect, and kerosene is used as a new foam regulator to adjust the foam stability to improve the process stability; subsequently, the molybdenum, bismuth and mixed concentrates are added with sodium sulfide and a small amount of kerosene to effectively separate the molybdenum concentrate from the bismuth concentrate. Thereby, the separation of molybdenite, bismuthite and pyrite is achieved, and the efficient separation of molybdenum, bismuth and sulfur is achieved, effectively improving the molybdenum, bismuth and sulfur separation indicators;

[0022] The use of sulfur-inhibiting agent T-706 has achieved the non-toxicity of the molybdenum, bismuth and sulfur separation process. The use of kerosene as a foam regulator in the separation process of molybdenum, bismuth and sulfur has improved the process stability. At the same time, the use of collector ethyl dithiodiphenyltrichloroethane and activated carbon in the de-drug process has been eliminated, which has greatly reduced the labor intensity of operators and eliminated the use of toxic agent sodium cyanide. The grade of molybdenum concentrate and bismuth concentrate can be stably and effectively improved, while the recovery rate of molybdenum concentrate and bismuth concentrate can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a flow chart of the present invention. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] The present embodiment provides a highly efficient and non-toxic beneficiation method for improving the molybdenum, bismuth and sulfur separation index, comprising the following steps:

[0026] Step 1: Concentrate the whole flotation concentrate sample and the molybdenum, bismuth and sulfur mixed sample to a concentration of 30%, with a fineness of -0.074mm accounting for 80-95%, as the molybdenum, bismuth and sulfur separation feed ore;

[0027] Step 2: add lime and kerosene to the ore sample in step 1 in sequence, stir thoroughly, then add non-toxic sulfur inhibitor and continue stirring for a period of time to separate molybdenum, bismuth and sulfur, the dosage of combined inhibitor is 10-60kg / t, foam regulator is 10-150g / t, sulfur inhibitor is 0.5-3kg / t, silicon inhibitor is 0.5-3kg / t, and molybdenum-bismuth mixed rough concentrate and rough tailings are obtained;

[0028] Step 3: Separate and scavenge the roughing tailings sample obtained in step 2. The tailings are sulfur concentrates, and perform three blank scavenge selections;

[0029] Step 4: The molybdenum-bismuth mixed rough concentrate obtained in step 2 is beneficiated three times to obtain a molybdenum-bismuth mixed concentrate, wherein the amount of the combined inhibitor of concentrate 1 is 2-15kg / t, the amount of the sulfur inhibition agent is 0.2-1.5kg / t, the amount of the combined inhibitor of concentrate 2 is 0-8kg / t, the amount of the sulfur inhibition agent is 0-0.5kg / t, the amount of the combined inhibitor of concentrate 3 is 0-4kg / t, and the amount of the sulfur inhibition agent is 0-0.2kg / t;

[0030] Step 5: Separate and roughly select the molybdenum and bismuth mixed concentrate obtained in step 4, add 30-90 kg / t of inhibitor and 30-200 g / t of foam regulator to obtain rough molybdenum concentrate and rough tailings;

[0031] Step 6: beneficiating the molybdenum rough concentrate obtained in step 5 to obtain molybdenum concentrate, adding 20-60kg / t of inhibitor to concentrate 1, 10-40kg / t of inhibitor to concentrate 2, 0-100g / t of foam regulator, and 0-20kg / t of inhibitor to concentrate 3;

[0032] Step 7: The rough tailings obtained in step 5 are subjected to molybdenum-bismuth separation scavenging. The tailings are bismuth concentrate, and two blank scavengings are performed.

[0033] In step 1 of this embodiment, the concentration of the fully floated concentrate sample is 30%, and the fineness of -0.074 mm accounts for 80-95%.

[0034] In step 2 of this embodiment, the combined inhibitor is lime, the foam regulator is kerosene, the sulfur inhibitor is T-70, and the silicon inhibitor is water glass.

[0035] In step 4 of this embodiment, the combined inhibitor is lime and the sulfur inhibitor is T-706.

[0036] In step 5 of this embodiment, the inhibitor is sodium sulfide and the foam adjusting agent is kerosene.

[0037] In step 6 of this embodiment, the inhibitor is sodium sulfide and the foam adjusting agent is kerosene.

[0038] Example 1, the present invention provides a highly efficient and non-toxic beneficiation method for improving the separation index of molybdenum, bismuth and sulfur, please refer to the accompanying drawings, comprising the following operating steps:

[0039] Step 1: Concentrate the whole flotation concentrate sample (molybdenum, bismuth and sulfur mixed sample with Mo content of 2% and Bi content of 3%) to a concentration of 30%, and the fineness of -0.074mm accounts for 80%;

[0040] Step 2: Add lime and kerosene to the ore sample in step 1 in sequence, stir thoroughly, then add non-toxic sulfur inhibitor and continue stirring for a period of time to perform rough separation of molybdenum, bismuth and sulfur, with a lime dosage of 10kg / t, kerosene 10g / t, sulfur inhibitor T-706 dosage of 0.5kg / t, and water glass dosage of 0.5kg / t to obtain a molybdenum-bismuth mixed rough concentrate and rough tailings;

[0041] Step 3: Separate and scavenge the roughing tailings obtained in step 2 to obtain sulfur concentrate, perform three blank scavenge operations, and return the scavenge concentrate to the previous operation section in sequence;

[0042] Step 4: The molybdenum-bismuth mixed rough concentrate obtained in step 2 is beneficiated three times to obtain a molybdenum-bismuth mixed concentrate, the amount of lime used in concentrate 1 is 2kg / t, the amount of sulfur-inhibiting agent T-706 is 0.2kg / t, the amount of lime used in concentrate 2 is 0kg / t, the amount of sulfur-inhibiting agent T-706 is 0kg / t, the amount of lime used in concentrate 3 is 0kg / t, the amount of sulfur-inhibiting agent T-706 is 0kg / t, and the selected middlings are returned to the previous operation section in order;

[0043] Step 5: Separate and roughly select the molybdenum and bismuth mixed concentrate obtained in step 4, add 30 kg / t of sodium sulfide and 30 g / t of kerosene to obtain a molybdenum roughing concentrate and roughing tailings;

[0044] Step 6: The molybdenum rougher concentrate obtained in step 5 is refined three times to obtain molybdenum concentrate. The amount of sodium sulfide added to refine 1 is 20kg / t, the amount of sodium sulfide added to refine 2 is 10kg / t, and the amount of kerosene added to refine 3 is 0kg / t. The refined middlings are returned to the previous operation section in order.

[0045] Step 7: The roughing tailings obtained in step 5 are subjected to two blank scavenging operations to obtain bismuth concentrate, and the scavenging concentrate is returned to the previous operation section in sequence;

[0046] Example 2, the present invention provides a highly efficient and non-toxic beneficiation method for improving the separation index of molybdenum, bismuth and sulfur, please refer to the attached figure, comprising the following steps:

[0047] Step 1: Concentrate the whole flotation concentrate sample (molybdenum, bismuth and sulfur mixed sample with Mo content of 2% and Bi content of 3%) to a concentration of 30%, and the fineness of -0.074mm accounts for 85%;

[0048] Step 2: Add lime and kerosene to the ore sample in step 1 in sequence, stir thoroughly, then add non-toxic sulfur inhibitor and continue stirring for a period of time to perform rough separation of molybdenum, bismuth and sulfur, with a lime dosage of 30kg / t, kerosene 50g / t, sulfur inhibitor T-706 dosage of 1kg / t, and water glass dosage of 1kg / t to obtain a molybdenum-bismuth mixed rough concentrate and rough tailings;

[0049] Step 3: Separate and scavenge the roughing tailings obtained in step 2 to obtain sulfur concentrate, perform three blank scavenge operations, and return the scavenge concentrate to the previous operation section in sequence;

[0050] Step 4: The molybdenum-bismuth mixed rough concentrate obtained in step 2 is beneficiated three times to obtain a molybdenum-bismuth mixed concentrate, wherein the amount of lime used in concentrate 1 is 5kg / t, the amount of sulfur-inhibiting agent T-706 is 0.8kg / t, the amount of lime used in concentrate 2 is 4kg / t, the amount of sulfur-inhibiting agent T-706 is 0.2kg / t, the amount of lime used in concentrate 3 is 1kg / t, the amount of sulfur-inhibiting agent T-706 is 0.15kg / t, and the selected middlings are returned to the previous operation section in order;

[0051] Step 5: performing rough separation of molybdenum and bismuth on the molybdenum-bismuth mixed concentrate obtained in step 4, adding 60 kg / t of sodium sulfide and 100 g / t of kerosene to obtain a rough molybdenum concentrate and rough tailings;

[0052] Step 6: The molybdenum rougher concentrate obtained in step 5 is refined three times to obtain molybdenum concentrate. 35kg / t of sodium sulfide is added to refine 1, 20kg / t of sodium sulfide and 50g / t of kerosene are added to refine 2, and 10kg / t of sodium sulfide is added to refine 3. The refined middlings are returned to the previous operation section in order.

[0053] Step 7: The roughing tailings obtained in step 5 are subjected to two blank scavenging operations to obtain bismuth concentrate, and the scavenging concentrate is returned to the previous operation section in sequence;

[0054] Example 3, the present invention provides a highly efficient and non-toxic beneficiation method for improving the separation index of molybdenum, bismuth and sulfur, please refer to the attached figure, comprising the following steps:

[0055] Step 1: Concentrate the whole flotation concentrate sample (molybdenum, bismuth and sulfur mixed sample with Mo content of 2% and Bi content of 3%) to a concentration of 30%, with a fineness of -0.074mm accounting for 90%;

[0056] Step 2: Add lime and kerosene to the ore sample in step 1 in sequence, stir thoroughly, then add non-toxic sulfur inhibitor and continue stirring for a period of time to perform rough separation of molybdenum, bismuth and sulfur, with a lime dosage of 50kg / t, kerosene 100g / t, sulfur inhibitor T-706 dosage of 2kg / t, and water glass dosage of 2kg / t to obtain a molybdenum-bismuth mixed rough concentrate and rough tailings;

[0057] Step 3: Separate and scavenge the roughing tailings obtained in step 2 to obtain sulfur concentrate, perform three blank scavenge operations, and return the scavenge concentrate to the previous operation section in sequence;

[0058] Step 4: The molybdenum-bismuth mixed rough concentrate obtained in step 2 is beneficiated three times to obtain a molybdenum-bismuth mixed concentrate, wherein the amount of lime used in concentrate 1 is 10 kg / t, the amount of sulfur-inhibiting agent T-706 used is 1 kg / t, the amount of lime used in concentrate 2 is 6 kg / t, the amount of sulfur-inhibiting agent T-706 used is 0.4 kg / t, the amount of lime used in concentrate 3 is 3 kg / t, the amount of sulfur-inhibiting agent T-706 used is 0.15 kg / t, and the selected medium ore is returned to the previous operation section in sequence;

[0059] Step 5: performing rough separation of molybdenum and bismuth on the molybdenum-bismuth mixed concentrate obtained in step 4, adding 80 kg / t of sodium sulfide and 150 g / t of kerosene to obtain a rough molybdenum concentrate and rough tailings;

[0060] Step 6: The molybdenum rougher concentrate obtained in step 5 is refined three times to obtain molybdenum concentrate. For refinement 1, 50 kg / t of sodium sulfide is added, for refinement 2, 30 kg / t of sodium sulfide and 80 g / t of kerosene are added, and for refinement 3, 15 kg / t of sodium sulfide is added. The refined middlings are returned to the previous operation section in order.

[0061] Step 7: The roughing tailings obtained in step 5 are subjected to two blank scavenging operations to obtain bismuth concentrate, and the scavenging concentrate is returned to the previous operation section in sequence;

[0062] Example 4, the present invention provides a highly efficient and non-toxic beneficiation method for improving the separation index of molybdenum, bismuth and sulfur, please refer to the attached figure, comprising the following steps:

[0063] Step 1: Concentrate the whole flotation concentrate sample (molybdenum, bismuth and sulfur mixed sample with Mo content of 2% and Bi content of 3%) to a concentration of 30%, and the fineness of -0.074mm accounts for 95%;

[0064] Step 2: Add lime and kerosene to the ore sample in step 1 in sequence, stir thoroughly, then add non-toxic sulfur inhibitor and continue stirring for a period of time to perform rough separation of molybdenum, bismuth and sulfur. The amount of lime is 60kg / t, kerosene is 150g / t, the amount of sulfur inhibitor T-706 is 3kg / t, and the amount of water glass is 3kg / t to obtain a molybdenum-bismuth mixed rough concentrate and rough tailings;

[0065] Step 3: Separate and scavenge the roughing tailings obtained in step 2 to obtain sulfur concentrate, perform three blank scavenge operations, and return the scavenge concentrate to the previous operation section in sequence;

[0066] Step 4: The molybdenum-bismuth mixed rough concentrate obtained in step 2 is beneficiated three times to obtain a molybdenum-bismuth mixed concentrate, wherein the amount of lime used in concentrate 1 is 15kg / t, the amount of sulfur-inhibiting agent T-706 is 1.5kg / t, the amount of lime used in concentrate 2 is 8kg / t, the amount of sulfur-inhibiting agent T-706 is 0.5kg / t, the amount of lime used in concentrate 3 is 4kg / t, the amount of sulfur-inhibiting agent T-706 is 0.2kg / t, and the selected medium ore is returned to the previous operation section in sequence;

[0067] Step 5: performing rough separation of molybdenum and bismuth on the molybdenum-bismuth mixed concentrate obtained in step 4, adding 90 kg / t of sodium sulfide and 200 g / t of kerosene to obtain a rough molybdenum concentrate and rough tailings;

[0068] Step 6: The molybdenum rougher concentrate obtained in step 5 is refined three times to obtain molybdenum concentrate. 60kg / t of sodium sulfide is added to refine 1, 40kg / t of sodium sulfide and 100g / t of kerosene are added to refine 2, and 20kg / t of sodium sulfide is added to refine 3. The refined middlings are returned to the previous operation section in order.

[0069] Step 7: The roughing tailings obtained in step 5 are subjected to two blank scavenging operations to obtain bismuth concentrate, and the scavenging concentrate is returned to the previous operation section in sequence;

[0070] The above Examples 1-4 were subjected to mineral processing tests, flotation test indicators (wt%), and process toxicity content, and the following data were obtained:

[0071]

[0072] It can be seen from the examples that compared with the traditional sulfur suppression process using sodium cyanide, the toxicity content of the process of the present invention is extremely low. In Example 2, it can even be non-toxic and can effectively improve the recovery rate of molybdenum, bismuth and sulfur separation.

[0073] Example 2 The results of the mineral processing test are shown in the following table. Flotation test index (wt%)

[0074]

[0075] As can be seen from Table 2, in Example 2, the molybdenum concentrate yield is 3.26γ / %, the bismuth concentrate yield is 8.83γ / %, the tailings output is 87.91γ / %, the total output is 100Σ, the molybdenum concentrate and MO combined grade is 45.93β / %, the molybdenum concentrate and Bi combined grade is 0.63β / %, the bismuth concentrate and Mo combined grade is 0.65β / %, the bismuth concentrate and Bi combined grade is 28.84β / %, the tailings and Mo combined grade is 0.030β / %, the tailings and Bi combined grade is 0.25β / %, the total combined with MO is 1.58Σ, the total combined with Bi is 2.79Σ, and the recovery rate of molybdenum concentrate and Mo is 94.70ε / %, molybdenum concentrate and Bi recovery rate 0.74ε / %, bismuth concentrate and Mo recovery rate 3.63ε / %, bismuth concentrate and Bi recovery rate 91.38ε / %, tailings and Mo recovery rate 1.67ε / %, tailings and Mo recovery rate 7.89ε / %, and Mo total 100Σ, and Bi total 100Σ, so it can be obtained that a certain amount of sulfur-inhibiting agent T-706 and lime are used as a combination to inhibit sulfur, and kerosene is used as a foam regulator. This process not only realizes the non-toxic and efficient separation of molybdenum, bismuth and sulfur, but also effectively improves the molybdenum and bismuth selection index, and the combined sulfur-inhibiting agent lime dosage is also very small, and the dosage of the collector ethyl sulfur nitrogen and activated carbon is cancelled. The embodiment shows that the use of the present invention can not only realize the non-toxic separation of molybdenum, bismuth and sulfur, but also cancel the agent activated carbon to reduce the labor intensity, and the use of the foam regulator can also effectively improve the process stability, and can also obtain better molybdenum concentrate and bismuth concentrate indicators.

[0076] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0077] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An efficient and non-toxic beneficiation method for improving the separation index of molybdenum, bismuth and sulfur, characterized in that: The following steps are involved: Step 1: Concentrate the whole flotation concentrate sample and the molybdenum, bismuth and sulfur mixed sample to a concentration of 30%, with a fineness of -0.074mm accounting for 80-95%, as the molybdenum, bismuth and sulfur separation feed ore; Step 2: add lime and kerosene to the ore sample in step 1 in sequence, stir thoroughly, then add non-toxic sulfur inhibitor and continue stirring for a period of time to separate molybdenum, bismuth and sulfur, the dosage of combined inhibitor is 10-60kg / t, foam regulator is 10-150g / t, sulfur inhibitor is 0.5-3kg / t, silicon inhibitor is 0.5-3kg / t, and molybdenum-bismuth mixed rough concentrate and rough tailings are obtained; Step 3: Separate and scavenging the rough tailings sample obtained in step 2. The tailings are sulfur concentrates, and three blank scavengings are performed; Step 4: The molybdenum-bismuth mixed rough concentrate obtained in step 2 is beneficiated three times to obtain a molybdenum-bismuth mixed concentrate, wherein the amount of the combined inhibitor of concentrate 1 is 2-15kg / t, the amount of the sulfur inhibition agent is 0.2-1.5kg / t, the amount of the combined inhibitor of concentrate 2 is 0-8kg / t, the amount of the sulfur inhibition agent is 0-0.5kg / t, the amount of the combined inhibitor of concentrate 3 is 0-4kg / t, and the amount of the sulfur inhibition agent is 0-0.2kg / t; Step 5: Separate and roughly select the molybdenum and bismuth mixed concentrate obtained in step 4, add 30-90 kg / t of inhibitor and 30-200 g / t of foam regulator to obtain rough molybdenum concentrate and rough tailings; Step 6: beneficiating the molybdenum rough concentrate obtained in step 5 to obtain molybdenum concentrate, adding 20-60kg / t of inhibitor to concentrate 1, 10-40kg / t of inhibitor to concentrate 2, 0-100g / t of foam regulator, and 0-20kg / t of inhibitor to concentrate 3; Step 7: The rough tailings obtained in step 5 are subjected to molybdenum-bismuth separation scavenging. The tailings are bismuth concentrate, and two blank scavengings are performed.

2. The method for beneficiation of a highly efficient and non-toxic method for improving the separation index of molybdenum, bismuth and sulfur according to claim 1, characterized in that: In the step 1, the concentration of the fully floated concentrate sample is 30%, and the fineness of -0.074 mm accounts for 80-95%.

3. A highly efficient and non-toxic beneficiation method for improving the separation index of molybdenum, bismuth and sulfur according to claim 2, characterized in that: In the step 2, the combined inhibitor is lime, the foam regulator is kerosene, the sulfur inhibitor is T-70, and the silicon inhibitor is water glass.

4. The method for beneficiation of an efficient and non-toxic method for improving the separation index of molybdenum, bismuth and sulfur according to claim 3 is characterized in that: In step 4, the combined inhibitor is lime and the sulfur inhibitor is T-706.

5. The method for beneficiation of an efficient and non-toxic method for improving the separation index of molybdenum, bismuth and sulfur according to claim 4 is characterized in that: In the step 5, the inhibitor is sodium sulfide and the foam adjusting agent is kerosene.

6. The highly efficient and non-toxic beneficiation method for improving the separation index of molybdenum, bismuth and sulfur according to claim 4 is characterized in that: In step six, the inhibitor is sodium sulfide and the foam adjusting agent is kerosene.

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