Method for beneficiation and recovery of gold and antimony metals in gold and antimony smelting waste residues

Abstract

The invention discloses a beneficiation and recovery method for gold and antimony metals in gold and antimony smelting waste residues, which comprises the following steps: carrying out primary grinding on the gold and antimony smelting waste residues, feeding the gold and antimony smelting waste residues into a spiral classifier for classification, enabling ore pulp A overflowing from the spiral classifier to flow into a spiral chute for separation to obtain heavy sand, and carrying out reselection on the heavy sand by adopting a shaking table to obtain reselected gold and antimony concentrates; spiral chute tailings and table tailings automatically flow into a sand pump pool and are pumped into a cyclone through a sand pump to be classified, ore pulp B overflowing out of the cyclone flows into a high-frequency fine screen to be classified, ore pulp C formed under the high-frequency fine screen enters a flotation process to obtain flotation gold and antimony concentrate, sand is settled through the cyclone to be subjected to second-stage ore grinding, and flotation gold and antimony concentrate is obtained. And then secondary grinding ore discharge and oversize products of the high-frequency fine screen are returned to the high-frequency fine screen for classification. According to the method, smelting waste residue resources are comprehensively utilized, valuable metal resources in the waste residues generated in the gold and antimony smelting industry are effectively recycled, waste is turned into wealth, and green development is practiced.

Description

Technical Field

[0001] The invention belongs to the technical field of beneficiation for recovering valuable metals from polymetallic smelting waste residues, and particularly relates to a method for beneficiating and recovering gold and antimony metals from gold-antimony smelting waste residues. Background Art

[0002] The gold-antimony smelting waste residue is a kind of residue obtained after products such as precious antimony, antimony oxide, and antimony matte are obtained from the blast furnace volatilization smelting process of antimony-gold concentrate. The gold grade in the waste residue is about 1.20 - 1.60 grams per ton, and the antimony grade in the waste residue is about between 1.2% and 2.0%. The main components of the waste residue are silicon dioxide, iron silicate, iron oxide, a small amount of iron-containing sulfides, metallic antimony, coal cinder, coke and other sundries. The yield of the waste residue is about 50% or so. The waste residue output of one blast furnace is about 25 tons per day or so, and the output is relatively large.

[0003] However, there is no report on the effective metal recovery from gold-antimony smelting waste residues in the prior art. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, in order to maximize the recovery of valuable gold and antimony resources in the waste residue and reduce the waste of resources, the purpose of the present invention is to provide a method for beneficiating and recovering gold and antimony metals from gold-antimony smelting waste residues. The method of the present invention comprehensively utilizes the waste residue resources of smelting, effectively recovers the valuable metal resources in the waste residues generated by the gold-antimony smelting industry, turns waste into treasure, and practices green development.

[0005] In order to achieve the above purpose, the technical solutions adopted by the present invention are as follows:

[0006] A method for beneficiating and recovering gold and antimony metals from gold-antimony smelting waste residues of the present invention is as follows: after the gold-antimony smelting waste residues are ground in one stage, they are sent to a spiral classifier for classification. The pulp A overflowing from the spiral classifier flows into a spiral chute for separation to obtain heavy sand. The heavy sand is subjected to gravity separation by a shaking table to obtain gravity separation gold-antimony concentrate. The tailings of the spiral chute and the tailings of the shaking table flow into a sand pump pool by self-flow, and are pumped into a hydrocyclone for classification by a sand pump. The pulp B overflowing from the hydrocyclone flows into a high-frequency fine screen for classification. The pulp C formed under the high-frequency fine screen enters the flotation process to obtain flotation gold-antimony concentrate. The underflow of the hydrocyclone is ground in two stages, and then the discharge of the two-stage grinding and the oversize of the high-frequency fine screen are returned to the high-frequency fine screen for classification again.

[0007] The method for recovering metals from gold-antimony smelting waste slag of the present invention firstly adopts a closed circuit of a first-stage grinding and a spiral classifier to control the fineness of the overflow pulp. The overflow pulp overflows from the spiral classifier into a spiral chute for sorting. The heavy sand is obtained by the difference in specific gravity between the gold-antimony metal and the gangue. The heavy sand is re-selected by a shaking table to separate the re-selected gold-antimony concentrate product. The inventor has found that the combination of the spiral chute and the shaking table for re-selection can effectively recover the valuable metal re-selected gold-antimony concentrate from the gold-antimony smelting waste slag, especially antimony. After pyrometallurgy, most of the antimony is wrapped in the waste slag in a metal state. , through the combined gravity separation of spiral chute + shaking table, effective recovery can be achieved; and the spiral chute tailings and shaking table tailings are combined for classification through a cyclone group + high-frequency fine screen. The cyclone sand concentration is controlled at 72%~74%, and the high-frequency screen hole size is controlled at 0.1mm, which can well control the final particle size, effectively open the package of useful minerals and gangue of gold and antimony in smelting waste, and form a closed circuit with the ball mill and the cyclone group, which improves the classification efficiency, can ensure the grinding concentration of the second-stage grinding, and can effectively control the concentration and particle size of the flotation, and finally obtain the flotation gold-antimony concentrate through the flotation process.

[0008] In a preferred embodiment, 50% or more of the mineral A in the slurry A has a fineness of -200 mesh.

[0009] In a preferred embodiment, in the slurry A, the mass fraction of mineral A is 48-55%.

[0010] In a preferred solution, the mass concentration of the cyclone sedimentation sand is ≥72%, preferably 72% to 74%.

[0011] Preferably, the mesh size of the high-frequency fine screen is 0.1 mm.

[0012] In a preferred embodiment, 85% to 88% of the mineral C in the slurry C has a fineness of -200 mesh.

[0013] In a preferred embodiment, in the slurry C, the mass fraction of mineral C is 33-35%.

[0014] Preferably, the flotation process comprises a roughing process, a scavenging process and two cleaning processes.

[0015] Further preferably, in the flotation process, the primary scavenging concentrate and the secondary scavenging concentrate are ground by a tower mill, and the tower mill discharge is returned to the primary roughing process.

[0016] In the present invention, the secondary scavenging concentrate and the second scavenging concentrate are ground by a tower mill, which can effectively open the encapsulation of useful gold and antimony minerals by gangue minerals. The tower mill discharges the ore and returns it to the roughing separation for separation, which can effectively improve the gold and antimony recovery rate index. In addition, because the scavenging foam contains residual reagents, the amount of reagents used in the roughing separation operation can also be reduced.

[0017] Further preferably, the reagents for flotation are selected from at least one of copper sulfate, lead nitrate, butyl xanthate, butylamine black medicine, and No. 2 oil. By adding appropriate amounts of ore dressing reagents such as copper sulfate, lead nitrate, butyl xanthate, and butylamine black medicine, the effective recovery of valuable gold and antimony minerals in the smelting waste residue can be achieved. A flotation gold and antimony concentrate with a gold grade of 58 g / t and an antimony grade of 36.20% can be obtained.

[0018] Even more preferably, the reagents for flotation are composed as follows: 135 - 145 g / t of copper sulfate, 70 - 80 g / t of lead nitrate, 235 - 245 g / t of butyl xanthate, 120 - 130 g / t of sodium butyl black medicine, and 15 - 20 g / t of No. 2 oil.

[0019] Beneficial effects:

[0020] (1) The comprehensive utilization of the waste residue generated in the gold and antimony smelting industry is realized, the valuable metal resources in the waste residue are effectively recovered, turning the gold and antimony smelting waste residue into a valuable resource and practicing green development.

[0021] (2) The overflow of the first-stage grinding classifier adopts a combined gravity separation with a spiral chute and a shaking table, which can effectively recover the valuable metals in the gold and antimony smelting waste residue, especially antimony. After pyrometallurgy, most of the antimony is wrapped in the waste residue in a metallic state. Through the combined gravity separation with a spiral chute + shaking table, effective recovery can be achieved.

[0022] (3) The second-stage grinding classification system adopts a combined classification composed of a hydrocyclone group + a high-frequency fine screen, which improves the classification efficiency, can ensure the grinding concentration of the second-stage grinding, and can effectively control the concentration and particle size of the material entering the flotation.

[0023] (4) The scavenging I and scavenging II concentrates are ground by a tower mill, which can effectively open the wrapping of gangue minerals in the scavenging concentrate foam, improve the gold and antimony flotation recovery rate, and reduce the reagent consumption in the roughing operation.

[0024] (5) The economic benefits generated by this process are huge: Through a production of 150 tons per day (when the amount of waste residue is large, a larger beneficiation scale can be built), applying this process to recover the metals in the gold and antimony smelting waste residue has the advantages of a smooth process flow and up-to-standard technical and economic indicators.

[0025] Before treatment, the gold and antimony smelting waste residue contains 1.70 g / t of gold and 2.5% of antimony. After beneficiation and recovery using this process, the tailings discharged contain 0.50 g / t of gold and 1.55% of antimony.

[0026] According to the production situation, 4.55 tons of gold-antimony concentrate is produced every day, of which 2.5 tons of gravity-selected gold-antimony concentrate is produced, and the gravity-selected gold-antimony concentrate contains 33.20 grams per ton of gold and 52.80% of antimony; 2.05 tons of flotation gold-antimony concentrate is produced every day, and the flotation gold-antimony concentrate contains 48.10 grams per ton of gold and 8.8% of antimony. The gold and antimony metal recovery rates are as follows:

[0027] Gold metal recovery rate:

[0028] Σ=(2.5×33.20+2.05×48.10)÷(150×1.7)×100

[0029] =71.14%

[0030] Antimony metal recovery rate:

[0031] Σ=(2.5×52.8%+2.05×8.80%)÷(150×2.5%)×100

[0032] =40.01% BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Process flow chart of the present invention. DETAILED DESCRIPTION

[0034] Example 1

[0035] (1) One-stage grinding and classification process: The gold-antimony smelting waste slag is firstly ground by ball milling, and the one-stage grinding and spiral classifier are closed-circuited to control the overflow product of the classifier to -200 mesh 50% and the overflow concentration to 50%.

[0036] (2) Gravity separation process: The overflow of the spiral classifier flows into the spiral chute for separation. The heavy sand is obtained by the difference in specific gravity between gold and antimony metals and gangue. The heavy sand is then re-separated using a shaking table to separate out the gravity-separated gold-antimony concentrate product. The gold grade of the gravity-separated concentrate is 55 g / t and the antimony grade is 52.80%. The spiral chute tailings and the shaking table tailings are sent to the secondary grinding and classification system together.

[0037] (3) Second-stage grinding and classification process: The second-stage grinding and classification adopts a combined classification of a cyclone group + a high-frequency fine screen, which effectively opens the encapsulation of useful minerals and gangue of gold and antimony in the smelting waste, and forms a closed circuit with the ball mill and the cyclone group; the spiral chute tailings and the shaking table tailings first flow into the sand pump pool by gravity, and are pumped into the cyclone group by the sand pump for classification. The cyclone sedimentation sand enters the ball mill (the concentration is controlled at above 72% to 74%), and the cyclone overflow enters the high-frequency fine screen for further classification. The high-frequency screen is screened together with the second-stage ball mill discharge into the sand pump pool, and the high-frequency screen is screened into the flotation. The cyclone group and the high-frequency fine screen form a combined closed circuit to control the floating particle size at -200 mesh 85% to 88%, and the pulp concentration is controlled at 33% to 35%.

[0038] (4) Flotation process: The flotation process adopts one roughing, two scavenging, and two cleaning operations, and the total flotation time is controlled within 40 minutes. The reagent regime of the flotation process is as follows: the dosage of copper sulfate is 140 g / t, the dosage of lead nitrate is 75 g / t, the dosage of butyl xanthate is 240 g / t, the dosage of sodium butyl dithiophosphate is 120 g / t, and the dosage of No. 2 oil is 15 g / t. The effective recovery of gold and antimony useful minerals in the smelting waste residue is achieved. The gold-bearing grade of the flotation gold-antimony concentrate can reach 58 g / t, and the antimony-bearing grade is 36.20%. # Before treatment, the gold-antimony smelting waste residue contains 1.70 g / t of gold and 2.5% of antimony. After beneficiation and recovery using this process, the tailings discharged contain 0.50 g / t of gold and 1.55% of antimony.

[0039] (5) Regrinding process for scavenging concentrate: The scavenging concentrate 1 and scavenging concentrate 2 are ground using a tower mill to effectively break the encapsulation of gold and antimony useful minerals by gangue minerals. The discharge of the tower mill is then returned to the roughing for separation, which can effectively improve the gold and antimony recovery rate index. In addition, since the scavenging foam contains residual reagents, the dosage of reagents in the roughing separation operation can also be reduced.

[0040] Before treatment, the gold-antimony smelting waste residue contains 1.70 g / t of gold and 2.5% of antimony. After beneficiation and recovery using this process, the tailings discharged contain 0.50 g / t of gold and 1.55% of antimony.

Claims

1. A method for beneficiation and recovery of gold and antimony metals from gold-antimony smelting waste residue, characterized in that: After the gold-antimony smelting waste residue is ground in one stage, it is sent to a spiral classifier for classification. The pulp A overflowing from the spiral classifier flows into a spiral chute for separation to obtain heavy sand. The heavy sand is subjected to gravity separation using a shaking table to obtain gravity separation gold-antimony concentrate. The tailings from the spiral chute and the tailings from the shaking table flow into the sand pump pool by self-flow, and are pumped into a hydrocyclone through a sand pump for classification. The pulp B overflowing from the hydrocyclone flows into a high-frequency fine screen for classification. The pulp C formed under the high-frequency fine screen enters the flotation process to obtain flotation gold-antimony concentrate. The hydrocyclone underflow is ground in the second stage, and then the discharge from the second-stage grinding and the oversize of the high-frequency fine screen are returned to the high-frequency fine screen for classification again.

2. A method for beneficiation and recovery of gold and antimony metals from gold-antimony smelting waste residue according to claim 1, characterized in that: Mineral A in the pulp A has a fineness of -200 mesh or more and 50% or more.

3. A method for beneficiation and recovery of gold and antimony metals from gold-antimony smelting waste residue according to claim 1 or 2, characterized in that: In the pulp A, the mass fraction of mineral A is 48-55%.

4. A method for beneficiating and recovering gold and antimony metals from gold-antimony smelting waste residue according to claim 1, characterized in that: The mass concentration of the hydrocyclone underflow is ≥72%.

5. A method for beneficiation and recovery of gold and antimony metals from gold-antimony smelting waste slag according to claim 1, characterized in that: The screen holes of the high-frequency fine screen are 0.1 mm.

6. A method for beneficiation and recovery of gold and antimony metals from gold-antimony smelting waste residue according to claim 1, characterized in that: Mineral C in the pulp C has a fineness of 85%-88% of -200 mesh.

7. A method for beneficiation and recovery of gold and antimony metals from gold-antimony smelting waste residues according to claim 1 or 6, characterized in that: In the pulp C, the mass fraction of mineral C is 33-35%.

8. A method for beneficiation and recovery of gold and antimony metals from gold-antimony smelting waste residue according to claim 1, characterized in that: The flotation process includes one roughing, two scavengings, and two cleanings.

9. A method for beneficiation and recovery of gold and antimony metals from gold-antimony smelting waste slag according to claim 1, characterized in that: In the flotation process, the concentrate from the first scavenging and the concentrate from the second scavenging are ground using a tower mill, and the discharge from the tower mill is returned to the first roughing; The reagents for flotation are selected from at least one of copper sulfate, lead nitrate, butyl xanthate, butylamine black drug, and No. 2 oil.

10. A method for beneficiation and recovery of gold and antimony metals from gold-antimony smelting waste slag according to claim 9, characterized in that: The reagents for flotation are composed as follows: copper sulfate 135-145 g / ton, lead nitrate 70-80 g / ton, butyl xanthate 235-245 g / ton, sodium butyl black drug 120-130 g / ton, and the dosage of No. 2 oil is 15-20 g / ton.

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