Efficient flotation separation method for arsenic-containing copper-molybdenum ore

Abstract

The invention provides an efficient flotation separation method for arsenic-containing copper-molybdenum ore, which comprises the following steps: adding a regulator into the arsenic-containing copper-molybdenum ore, grinding, stirring, diluting and concentrating to carry out an ore pulp pretreatment process, and carrying out a molybdenum-copper pre-flotation process on the treated ore pulp under the action of a selective flotation reagent to realize the first separation of the arsenic-containing ore; performing high-arsenic copper-molybdenum separation on the pre-floating process foam to produce molybdenum concentrate and high-arsenic copper concentrate; the pre-flotation process tailings are subjected to copper-arsenic-sulfur bulk flotation, regrinding and a copper-arsenic-sulfur separation process, secondary separation of arsenic-containing minerals is achieved, and finally a low-arsenic copper concentrate product is obtained; according to the method, a traditional process scheme for separating the arsenic-containing copper ore from the product is simplified, the formed high-arsenic copper concentrate and low-arsenic copper concentrate products can reduce arsenic pollution, and meanwhile the overall value of the copper concentrate product can be improved by combining product sales.

Description

Technical Field

[0001] The invention belongs to the field of metallurgy and chemical industry, and in particular relates to a high-efficiency flotation separation method for arsenic-containing copper-molybdenum ore. Background Art

[0002] Copper-molybdenum resources are important mineral resources in the development of the world economy. With the rising demand for copper-molybdenum products and the consumption of traditional high-quality copper-molybdenum resources, complex copper-molybdenum resources have gradually entered the scope of mining. Arsenic-containing copper ores, such as arsenic-sulfur copper ores and arsenic-tetrahedrite, are often closely associated with various sulfur-containing copper ores. Arsenic-containing copper ores have similar floatability to other sulfide copper ores, and it is difficult to separate copper and arsenic by traditional flotation processes. This causes serious pollution to the environment during subsequent deep processing and affects the value of commodities at the product sales end. Therefore, the development of an efficient flotation separation technology for arsenic-containing copper-molybdenum ores can not only increase the value of product sales, but also be an effective means to develop green and low-carbon minerals. Summary of the invention

[0003] The object of the present invention is to provide a high-efficiency flotation separation method for arsenic-containing copper-molybdenum ore.

[0004] The object of the present invention is achieved in that the efficient flotation separation method of arsenic-containing copper-molybdenum ore comprises pretreatment, preflotation, separation, mixed selection and copper-sulfur-arsenic separation steps, specifically comprising: A. Pretreatment: Add lime and adjusting agent KT2 to the arsenic-containing copper-molybdenum ore to be treated for grinding, the grinding fineness is -74μm and the content is 55%~65%, add water to adjust the slurry to a concentration of 5~10%, stir for 5~10 minutes, and then concentrate to obtain underflow a and overflow water b; The adjusting agent KT2 is composed of sodium sulfide and potassium permanganate; B. Pre-flotation: add collector KC-1 and frother KA-1 to the underflow a for a molybdenum-copper pre-roughing; add lime and frother KA-1 for three molybdenum-copper pre-concentration to obtain foam b, and the tailings are returned step by step; The collector KC-1 is composed of isobutyl black medicine methyl ethyl sulfide ester, kerosene and pyridine; The foaming agent KA-1 is composed of methyl isobutyl carbinol and tripropylene glycol ethyl ether; C. Separation: 1) Add water to the foam b and stir to thicken and remove the drug to obtain a thick underflow c and overflow water, and the overflow water is returned to step B as return water; 2) Grind the dense underflow c to a fineness of -45 μm and a content of 85-90% to obtain material d; 3) Add copper inhibitor and neutral oil to material d, perform one roughing, one scavenging and four cleaning to obtain final molybdenum concentrate product e and high arsenic copper concentrate product f; D. Mixed selection: 1) Sodium sulfide, collector B and frother B are added to the high-arsenic copper concentrate product f for mixed roughing to obtain copper-sulfur-arsenic mixed roughing foam g and roughing tailings h; 2) Collector B and frother B are added to the roughing tailings h to perform two scavenging operations to obtain the final tailings, and the scavenging foam is returned step by step; The collector B is composed of butyl ammonium black medicine and diethyl dithiocarbamate propionitrile; or is composed of butyl xanthate and diethyl dithiocarbamate propionitrile.

[0005] The foaming agent B is composed of pine oil and cyclohexanol; E. Copper, sulfur and arsenic separation: 1) Add sulfur and arsenic inhibitor to the copper sulfur and arsenic roughing foam g and grind it to a fineness of -74 μm and a content of 85-95% to obtain material i; 2) Collector B and frother B are added to material i for roughing to obtain copper-sulfur-arsenic roughing foam j and roughing tailings k; 3) Collector B and frother B are added to the roughing tailings k to carry out two scavenging operations to obtain arsenic-containing pyrite, and the scavenging foam is returned step by step; 4) Sulfur-arsenic inhibitor is added to the copper-sulfur-arsenic roughing foam j for two rounds of concentration to obtain the final low-arsenic copper concentrate product, and the concentrated tailings are returned step by step.

[0006] The specific operations are as follows: A. Slurry pretreatment process: add 300~600g / t of lime and 2200~300g / t of adjusting agent KT2 to the arsenic-containing copper-molybdenum ore to be treated for grinding. The grinding fineness is -74μm and the content is 55%~65%. The grinding product is diluted with clean water to a concentration of 5%~10%, stirred for 5~10 minutes, and the stirred slurry is concentrated to obtain underflow a and overflow water b. The concentration of the concentrated underflow is 35%~40%; B. Molybdenum-copper pre-flotation process: add collector KC-1 20-30g / t and frother KA-1 15-20g / t to the underflow a of step A for a molybdenum-copper pre-roughing, add lime 30-60 g / t and frother KA-1 5-10 g / t to the pre-roughing foam for a molybdenum-copper pre-concentration, add lime 10-20 g / t and frother KA-1 2-5 g / t to the pre-concentration foam for the second molybdenum-copper pre-concentration, and the pre-concentration foam blank for the third molybdenum-copper pre-concentration, the foam enters the next stage of the process, and the tailings are returned step by step; C. High-arsenic copper and molybdenum separation process: Add clean water to the foam from step B pre-refining to stir and thicken it for drug removal, and return the overflow water to step B as backwater, with a thick bottom flow concentration of 20%~25%. The underflow product is subjected to a grinding and scrubbing, and the grinding fineness is -45μm, accounting for 85%~90%. The grinding product is added with 200~300 g / t of copper inhibitor and 30~50 g / t of neutral oil for a roughing selection. The roughing tailings are added with 50~100 g / t of copper inhibitor and 10~20 g / t of neutral oil for a scavenging selection. The roughing foam is added with 50~100 g / t of copper inhibitor and 5~15 g / t of neutral oil for the first selection. The first selection foam is added with 30~50 g / t of copper inhibitor for the second selection. The second selection foam is added with 20~40 g / t of copper inhibitor for the third selection. The third selection foam is added with 10~20 g / t of copper inhibitor for the fourth selection. The tailings products are returned to the previous operation step by step. The fourth selection foam is the final molybdenum concentrate product, and the scavenging tailings are high-arsenic copper concentrate products. D. Copper, sulfur and arsenic mixed selection process: add 200-400 g / t of sodium sulfide, 30-40 g / t of collector B and 20-30 g / t of frother B to the tailings in step B for rough selection of copper, sulfur and arsenic mixed selection; add 15-20 g / t of collector B and 10-15 g / t of frother B to the rough selection tailings for scavenging selection one; add 5-10 g / t of collector B and 5-10 g / t of frother B to the scavenging selection one tailings for scavenging selection two; the scavenging foam is returned step by step; the scavenging two tailings are the final tailings.

[0007] E. Copper-sulfur-arsenic separation process: add 1000-1500 g / t of sulfur-arsenic inhibitor to the copper-sulfur-arsenic mixed roughing foam in step D for one re-grinding, the grinding fineness is -74μm and the content is 85%-95%, add 10-20 g / t of collector B and 10-20 g / t of frother B to the grinding product for one copper-sulfur-arsenic separation roughing, add 5-10 g / t of collector B and 5-8 g / t of frother B to the roughing tailings for copper-sulfur-arsenic separation scavenging, add 5-10 g / t of collector B and 5-8 g / t of frother B to the scavenging tailings for copper-sulfur-arsenic separation scavenging, the scavenging foam is returned step by step, and the scavenging tailings are arsenic-containing pyrite; add 200-400 g / t of sulfur-arsenic inhibitor to the copper-sulfur-arsenic separation roughing foam for fine selection, and add 100-200 g / t of sulfur-arsenic inhibitor to the fine selection foam. g / t for secondary concentration, the concentrated tailings are returned step by step, and the secondary concentration foam is the final low-arsenic copper concentrate product.

[0008] Furthermore, the main component of the adjusting agent KT2 in step A is a mixed product of sodium sulfide and potassium permanganate, wherein sodium sulfide accounts for 60% to 70% and potassium permanganate accounts for 30% to 40%; Furthermore, the main component of the collector KC-1 described in step B is a mixed product of isobutyl black medicine methyl ethyl sulfide ester, kerosene, and pyridine, wherein isobutyl black medicine methyl ethyl sulfide ester accounts for 30% to 40%, kerosene accounts for 50% to 60%, and pyridine accounts for 10% to 20%; Furthermore, the foaming agent KA-1 described in step B is a mixture of methyl isobutyl carbinol and tripropylene glycol ethyl ether, wherein methyl isobutyl carbinol and tripropylene glycol ethyl ether account for 70% to 80%, and tripropylene glycol ethyl ether accounts for 20% to 30%; Furthermore, the copper inhibitor described in step C is one or more of sodium sulfide, sodium hydrosulfide, and sodium thioglycolate; Furthermore, the neutral oil in step C is one or both of kerosene and diesel; Further, the collector B described in step D and step E is a combination of butyl ammonium black medicine and diethyl dithiocarbamate propionitrile, or butyl xanthate and diethyl dithiocarbamate propionitrile, wherein ethyl dithiocarbamate propionitrile accounts for 70% to 80%; Furthermore, the foaming agent B described in step D and step E is a combination of pine oil and cyclohexanol, wherein the cyclohexanol accounts for 40% to 60%; Furthermore, the sulfur-arsenic inhibitor described in step E is a combination of lime, sodium lignin sulfonate, and polyacrylamide, wherein lime accounts for 60% to 80%, sodium lignin sulfonate accounts for 10% to 20%, and polyacrylamide accounts for 10% to 20%.

[0009] Advantages of the present invention: 1. Through the slurry pretreatment process, the activation of the inevitable metal ions on the arsenic-containing pyrite can be effectively weakened, and the surface hydrophobicity difference between arsenic-containing copper minerals and other copper minerals can be strengthened by the adjusting agent KT2, so that the surface hydrophobicity of arsenic-free copper minerals is reduced. The highly selective collector KC-1 and frother KA-1 are used to make arsenic-containing copper minerals and molybdenum minerals float first, thus forming the first separation of arsenic minerals; 2. Through the copper-sulfur-arsenic mixed flotation process + copper-sulfur-arsenic mixed separation process, copper minerals, especially copper minerals with fine embedded particle size and relatively poor floatability, can be fully recovered to maximize the copper recovery rate. In addition, by adding a combined inhibitor of lime, sodium lignin sulfonate and polyacrylamide, copper and arsenic-containing minerals can be separated for the second time, thereby obtaining high-quality copper concentrate products with low arsenic content; 3. The flotation reagent used in this method has good degradability and can be naturally degraded in the tailings pond, which is environmentally friendly; 4. When separating arsenic minerals, this method takes into account the separate orientation of arsenic-containing copper minerals, simplifies the traditional process of separating arsenic-containing copper minerals from products, and forms two types of products, high-arsenic copper concentrate and low-arsenic copper concentrate. While reducing arsenic pollution, the overall value of copper concentrate products can be improved in combination with product sales; BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the process flow of the present invention. DETAILED DESCRIPTION

[0011] The present invention is further described below in conjunction with the embodiments, but the present invention is not limited in any way. Any changes or substitutions made based on the teachings of the present invention belong to the protection scope of the present invention.

[0012] The high-efficiency flotation separation method of arsenic-containing copper-molybdenum ore of the present invention comprises pretreatment, preflotation, separation, mixed selection and copper-sulfur-arsenic separation steps, specifically comprising: A. Pretreatment: Add lime and adjusting agent KT2 to the arsenic-containing copper-molybdenum ore to be treated for grinding, the grinding fineness is -74μm and the content is 55%~65%, add water to adjust the slurry to a concentration of 5~10%, stir for 5~10 minutes, and then concentrate to obtain underflow a and overflow water b; The adjusting agent KT2 is composed of sodium sulfide and potassium permanganate; B. Pre-flotation: add collector KC-1 and frother KA-1 to the underflow a for a molybdenum-copper pre-roughing; add lime and frother KA-1 for three molybdenum-copper pre-concentration to obtain foam b, and the tailings are returned step by step; The collector KC-1 is composed of isobutyl black medicine methyl ethyl sulfide ester, kerosene and pyridine; The foaming agent KA-1 is composed of methyl isobutyl carbinol and tripropylene glycol ethyl ether; C. Separation: 1) Add water to the foam b and stir to thicken and remove the drug to obtain a thick underflow c and overflow water, and the overflow water is returned to step B as return water; 2) Grind the dense underflow c to a fineness of -45 μm and a content of 85-90% to obtain material d; 3) Add copper inhibitor and neutral oil to material d, perform one roughing, one scavenging and four cleaning to obtain final molybdenum concentrate product e and high arsenic copper concentrate product f; D. Mixed selection: 1) Sodium sulfide, collector B and frother B are added to the high-arsenic copper concentrate product f for mixed roughing to obtain copper-sulfur-arsenic mixed roughing foam g and roughing tailings h; 2) Collector B and frother B are added to the roughing tailings h to perform two scavenging operations to obtain the final tailings, and the scavenging foam is returned step by step; The collector B is composed of butyl ammonium black medicine and diethyl dithiocarbamate propionitrile; or is composed of butyl xanthate and diethyl dithiocarbamate propionitrile.

[0013] The foaming agent B is composed of pine oil and cyclohexanol; E. Copper, sulfur and arsenic separation: 1) Add sulfur and arsenic inhibitor to the copper sulfur and arsenic roughing foam g and grind it to a fineness of -74 μm and a content of 85-95% to obtain material i; 2) Collector B and frother B are added to material i for roughing to obtain copper-sulfur-arsenic roughing foam j and roughing tailings k; 3) Collector B and frother B are added to the roughing tailings k to carry out two scavenging operations to obtain arsenic-containing pyrite, and the scavenging foam is returned step by step; 4) Sulfur-arsenic inhibitor is added to the copper-sulfur-arsenic roughing foam j for two rounds of concentration to obtain the final low-arsenic copper concentrate product, and the concentrated tailings are returned step by step.

[0014] The adjusting agent KT2 is composed of 60-70% by mass of sodium sulfide and 30-40% by mass of potassium permanganate.

[0015] The collector KC-1 is composed of 30-40% by mass of isobutyl black medicine methyl ethyl sulfide ester, 50-60% by mass of kerosene and 10-20% by mass of pyridine; The foaming agent KA-1 is composed of 70-80% by mass of methyl isobutyl carbinol and 20-30% by mass of tripropylene glycol ethyl ether.

[0016] The collector B is composed of butyl ammonium black medicine and diethyl dithiocarbamate propionitrile; or butyl xanthate and diethyl dithiocarbamate propionitrile; wherein ethyl dithiocarbamate propionitrile accounts for 70% to 80%.

[0017] The foaming agent B is composed of pine oil and cyclohexanol, wherein the mass percentage of cyclohexanol is 40-60%.

[0018] The copper inhibitor described in step C is one or more of sodium sulfide, sodium hydrosulfide and sodium thioglycolate.

[0019] The neutral oil described in step C is kerosene and / or diesel.

[0020] The sulfur-arsenic inhibitor in step E is composed of lime, sodium lignin sulfonate and polyacrylamide.

[0021] The sulfur-arsenic inhibitor is composed of 60-80% by weight of lime, 10-20% by weight of sodium lignin sulfonate and 10-20% by weight of polyacrylamide.

[0022] The present invention is further described below with specific implementation cases: Example 1

[0023] For an ore with a copper grade of 0.55% and an arsenic grade of 0.23% and main metal minerals such as chalcopyrite, molybdenite, copper arsenic ore and arsenopyrite, the closed-circuit test can obtain a high-arsenic copper concentrate with a copper grade of 20.11%, a copper recovery rate of 8.41%, and an arsenic content of 1.52%; a low-arsenic copper concentrate with a copper grade of 25.32%, a copper recovery rate of 74.58%, and an arsenic content of 0.21%; A. Slurry pretreatment process: add 500g / t of lime and 300g / t of adjusting agent KT2 to the arsenic-containing copper-molybdenum ore to be treated for grinding. The grinding fineness is -74μm and the content is 60%. The grinding product is diluted with clean water to a concentration of 6% and stirred for 8 minutes. The stirred slurry is concentrated to obtain underflow a and overflow water b. The concentration of the concentrated underflow is 40%; B. Molybdenum-copper pre-flotation process: add collector KC-1 30g / t and frother KA-1 20g / t to the underflow a of step A for a molybdenum-copper pre-roughing, add lime 50 g / t and frother KA-1 6 g / t to the pre-roughing foam for a molybdenum-copper pre-concentration, add lime 15 g / t and frother KA-1 4 g / t to the pre-concentration foam for the second molybdenum-copper pre-concentration, and the pre-concentration foam for the third molybdenum-copper pre-concentration is carried out without foam, and the foam enters the next stage of the process, and the tailings are returned step by step; C. Separation process of high arsenic copper and molybdenum: Add clean water to the foam of step B pre-refining three for stirring, thickening and drug removal, and return the overflow water to step B as backwater, with a thick bottom flow concentration of 22%. The bottom flow product is subjected to a grinding and scrubbing, and the grinding fineness is -45μm, accounting for 88%. The grinding product is added with 300 g / t of copper inhibitor and 40 g / t of neutral oil for a roughing selection, and the roughing tailings are added with 80 g / t of copper inhibitor and 15 g / t of neutral oil for a scavenging selection, and the roughing foam is added with 80 g / t of copper inhibitor and 10 g / t of neutral oil for the first selection, and the foam of the first selection is added with 40 g / t of copper inhibitor for the second selection, and the foam of the second selection is added with 30 g / t of copper inhibitor for the third selection, and the foam of the third selection is added with 15 g / t of copper inhibitor for the fourth selection. The tailings products are returned to the previous level step by step, and the foam of the fourth selection is the final molybdenum concentrate product, and the scavenging tailings are high arsenic copper concentrate products; D. Copper, sulfur and arsenic mixed selection process: add 300 g / t of sodium sulfide, 35 g / t of collector B and 20 g / t of frother B to the tailings in step B for rough selection of copper, sulfur and arsenic mixed selection; add 15 g / t of collector B and 10 g / t of frother B to the rough selection tailings for scavenging selection one; add 8 g / t of collector B and 5 g / t of frother B to the scavenging selection one tailings for scavenging selection two; the scavenging foam is returned step by step; the scavenging two tailings are the final tailings.

[0024] E. Copper-sulfur-arsenic separation process: add 1500 g / t of sulfur-arsenic inhibitor to the copper-sulfur-arsenic mixed roughing foam in step D for one regrinding, the grinding fineness is -74 μm and the content is 90%, add 15 g / t of collector B and 10 g / t of frother B to the grinding product for one copper-sulfur-arsenic separation roughing, add 5 g / t of collector B and 5 g / t of frother B to the roughing tailings for copper-sulfur-arsenic separation scavenging first, add 8 g / t of collector B and 5 g / t of frother B to the scavenging tailings for copper-sulfur-arsenic separation scavenging second, the scavenging foam is returned step by step, and the scavenging tailings are arsenic-containing pyrite; add 300 g / t of sulfur-arsenic inhibitor to the copper-sulfur-arsenic separation roughing foam for fine concentration first, add 200 g / t of sulfur-arsenic inhibitor to the fine concentration foam for fine concentration second, the fine concentration tailings are returned step by step, and the fine concentration foam is the final low-arsenic copper concentrate product.

[0025] Example 2

[0026] For an ore with a copper grade of 0.51% and an arsenic grade of 0.25% and main metal minerals of chalcopyrite, molybdenite, chalcopyrite and arsenopyrite, a closed-circuit test can obtain a high-arsenic copper concentrate with a copper grade of 20.56%, a copper recovery rate of 12.50%, and an arsenic content of 1.77% in the copper concentrate; a low-arsenic copper concentrate with a copper grade of 26.32%, a copper recovery rate of 73.28%, and an arsenic content of 0.17% in the copper concentrate; A. Slurry pretreatment process: add 600g / t lime and 300g / t KT2 adjusting agent to the arsenic-containing copper-molybdenum ore to be treated for grinding. The grinding fineness is -74μm and the content is 65%. The grinding product is diluted with clean water to a concentration of 7% and stirred for 10 minutes. The stirred slurry is concentrated to obtain underflow a and overflow water b. The concentration of the concentrated underflow is 40%; B. Molybdenum-copper pre-flotation process: add collector KC-1 25g / t and frother KA-1 18 g / t to the underflow a of step A for a molybdenum-copper pre-roughing, add lime 50 g / t and frother KA-1 10 g / t to the pre-roughing foam for a molybdenum-copper pre-concentration, add lime 20 g / t and frother KA-1 3 g / t to the pre-concentration foam for the second molybdenum-copper pre-concentration, and the pre-concentration foam for the third molybdenum-copper pre-concentration is carried out without foam, and the foam enters the next stage of the process, and the tailings are returned step by step; C. Separation process of high arsenic copper and molybdenum: Add clean water to the foam of pre-refining three in step B for stirring, thickening and drug removal, and return the overflow water to step B as backwater, with a thick bottom flow concentration of 25%. The bottom flow product is subjected to a grinding and scrubbing, and the grinding fineness is -45μm, accounting for 90%. The grinding product is added with 280 g / t of copper inhibitor and 40 g / t of neutral oil for a roughing selection, and the roughing tailings are added with 80 g / t of copper inhibitor and 15 g / t of neutral oil for a scavenging selection, and the roughing foam is added with 80 g / t of copper inhibitor and 10 g / t of neutral oil for the first selection, and the foam of the first selection is added with 40 g / t of copper inhibitor for the second selection, and the foam of the second selection is added with 30 g / t of copper inhibitor for the third selection, and the foam of the third selection is added with 15 g / t of copper inhibitor for the fourth selection. The tailings products are returned to the previous level step by step, and the fourth refinement foam is the final molybdenum concentrate product, and the scavenging tailings are high arsenic copper concentrate products; D. Copper, sulfur and arsenic mixed selection process: add 300 g / t of sodium sulfide, 35 g / t of collector B and 25 g / t of frother B to the tailings in step B for rough selection of copper, sulfur and arsenic mixed selection; add 20 g / t of collector B and 12 g / t of frother B to the rough selection tailings for scavenging one; add 8 g / t of collector B and 6 g / t of frother B to the scavenging one tailings for scavenging two; the scavenging foam is returned step by step; the scavenging two tailings are the final tailings.

[0027] E. Copper-sulfur-arsenic separation process: add 1300 g / t of sulfur-arsenic inhibitor to the copper-sulfur-arsenic mixed roughing foam in step D for one regrinding, the grinding fineness is -74μm and the content is 90%, add 15 g / t of collector B and 10 g / t of frother B to the grinding product for one copper-sulfur-arsenic separation roughing, add 8 g / t of collector B and 5 g / t of frother B to the roughing tailings for copper-sulfur-arsenic separation scavenging selection one, add 6 g / t of collector B and 5 g / t of frother B to the scavenging tailings for copper-sulfur-arsenic separation scavenging selection two, the scavenging foam is returned step by step, and the scavenging tailings are arsenic-containing pyrite; add 400 g / t of sulfur-arsenic inhibitor to the copper-sulfur-arsenic separation roughing foam for fine concentration one, add 200 g / t of sulfur-arsenic inhibitor to the fine concentration one foam for fine concentration two, the fine concentration tailings are returned step by step, and the fine concentration foam is the final low-arsenic copper concentrate product.

[0028] Example 3

[0029] For an ore with a copper grade of 0.48% and an arsenic grade of 0.19% and main metal minerals of chalcopyrite, molybdenite, chalcopyrite and arsenopyrite, a closed-circuit test can obtain a high-arsenic copper concentrate with a copper grade of 21.02%, a copper recovery rate of 17.95%, and an arsenic content of 1.82% in the copper concentrate; a low-arsenic copper concentrate with a copper grade of 25.18%, a copper recovery rate of 69.25%, and an arsenic content of 0.15% in the copper concentrate; A. Slurry pretreatment process: add 400g / t lime and 200g / t adjusting agent KT2 to the arsenic-containing copper-molybdenum ore to be treated for grinding. The grinding fineness is -74μm and the content is 59%. The grinding product is diluted with clean water to a concentration of 7% and stirred for 8 minutes. The stirred slurry is concentrated to obtain underflow a and overflow water b. The concentration of the concentrated underflow is 38%; B. Molybdenum-copper pre-flotation process: add collector KC-1 25g / t and frother KA-1 18g / t to the underflow a of step A for a molybdenum-copper pre-roughing, add lime 40g / t and frother KA-1 6g / t to the pre-roughing foam for a molybdenum-copper pre-concentration, add lime 12g / t and frother KA-1 3g / t to the pre-concentration foam for the second molybdenum-copper pre-concentration, and the pre-concentration foam for the third molybdenum-copper pre-concentration is carried out without foam, and the foam enters the next stage of the process, and the tailings are returned step by step; C. Separation process of high arsenic copper and molybdenum: Add clean water to the foam of pre-refining three in step B for stirring, thickening and drug removal, and return the overflow water to step B as backwater, with a thick bottom flow concentration of 22%. The bottom flow product is subjected to a grinding and scrubbing, and the grinding fineness is -45μm, accounting for 90%. The grinding product is added with 280 g / t of copper inhibitor and 40 g / t of neutral oil for a roughing selection, and the roughing tailings are added with 70 g / t of copper inhibitor and 12 g / t of neutral oil for a scavenging selection, and the roughing foam is added with 80 g / t of copper inhibitor and 8 g / t of neutral oil for the first selection, and the foam of the first selection is added with 40 g / t of copper inhibitor for the second selection, and the foam of the second selection is added with 30 g / t of copper inhibitor for the third selection, and the foam of the third selection is added with 15 g / t of copper inhibitor for the fourth selection. The tailings products are returned to the previous level step by step, and the foam of the fourth selection is the final molybdenum concentrate product, and the scavenging tailings are high arsenic copper concentrate products; D. Copper, sulfur and arsenic mixed selection process: add 300 g / t of sodium sulfide, 35 g / t of collector B and 25 g / t of frother B to the tailings in step B for rough selection of copper, sulfur and arsenic mixed selection; add 17 g / t of collector B and 12 g / t of frother B to the rough selection tailings for scavenging selection one; add 7 g / t of collector B and 5 g / t of frother B to the scavenging selection one tailings for scavenging selection two; the scavenging foam is returned step by step; the scavenging two tailings are the final tailings.

[0030] E. Copper-sulfur-arsenic separation process: add 1400 g / t of sulfur-arsenic inhibitor to the copper-sulfur-arsenic mixed roughing foam in step D for one regrinding, the grinding fineness is -74μm and the content is 88%, add 18 g / t of collector B and 12 g / t of frother B to the grinding product for one copper-sulfur-arsenic separation roughing, add 7 g / t of collector B and 6 g / t of frother B to the roughing tailings for copper-sulfur-arsenic separation scavenging first, add 7 g / t of collector B and 5 g / t of frother B to the scavenging tailings for copper-sulfur-arsenic separation scavenging second, the scavenging foam is returned step by step, and the scavenging tailings are arsenic-containing pyrite; add 300 g / t of sulfur-arsenic inhibitor to the copper-sulfur-arsenic separation roughing foam for fine concentration first, add 150 g / t of sulfur-arsenic inhibitor to the fine concentration first foam for fine concentration second, the fine concentration tailings are returned step by step, and the fine concentration second foam is the final low-arsenic copper concentrate product.

Claims

1. An efficient flotation separation method for arsenic-containing copper-molybdenum ore, characterized in that: The highly efficient flotation separation method of arsenic-containing copper-molybdenum ore comprises pretreatment, preflotation, separation, mixed selection and copper-sulfur-arsenic separation steps, specifically comprising: A. Pretreatment: Add lime and adjusting agent KT2 to the arsenic-containing copper-molybdenum ore to be treated for grinding, the grinding fineness is -74μm and the content is 55%~65%, add water to adjust the slurry to a concentration of 5~10%, stir for 5~10 minutes, and then concentrate to obtain underflow a and overflow water b; The adjusting agent KT2 is composed of sodium sulfide and potassium permanganate; B. Pre-flotation: add collector KC-1 and frother KA-1 to the underflow a for a molybdenum-copper pre-roughing; add lime and frother KA-1 for three molybdenum-copper pre-concentration to obtain foam b, and the tailings are returned step by step; The collector KC-1 is composed of isobutyl black medicine methyl ethyl sulfide ester, kerosene and pyridine; The foaming agent KA-1 is composed of methyl isobutyl carbinol and tripropylene glycol ethyl ether; C. Separation: 1) Add water to the foam b and stir to thicken and remove the drug to obtain a thick underflow c and overflow water, and the overflow water is returned to step B as return water; 2) Grind the dense underflow c to a fineness of -45 μm and a content of 85-90% to obtain material d; 3) Add copper inhibitor and neutral oil to material d, perform one roughing, one scavenging and four cleaning to obtain final molybdenum concentrate product e and high arsenic copper concentrate product f; D. Mixed selection: 1) Sodium sulfide, collector B and frother B are added to the high-arsenic copper concentrate product f for mixed roughing to obtain copper-sulfur-arsenic mixed roughing foam g and roughing tailings h; 2) Collector B and frother B are added to the roughing tailings h to perform two scavenging operations to obtain the final tailings, and the scavenging foam is returned step by step; The collector B is composed of butyl ammonium black medicine and diethyl dithiocarbamate propionitrile; or composed of butyl xanthate and diethyl dithiocarbamate propionitrile; The foaming agent B is composed of pine oil and cyclohexanol; E. Copper, sulfur and arsenic separation: 1) Add sulfur and arsenic inhibitor to the copper sulfur and arsenic roughing foam g and grind it to a fineness of -74 μm and a content of 85-95% to obtain material i; 2) Collector B and frother B are added to material i for roughing to obtain copper-sulfur-arsenic roughing foam j and roughing tailings k; 3) Collector B and frother B are added to the roughing tailings k to carry out two scavenging operations to obtain arsenic-containing pyrite, and the scavenging foam is returned step by step; 4) Sulfur-arsenic inhibitor is added to the copper-sulfur-arsenic roughing foam j for two rounds of concentration to obtain the final low-arsenic copper concentrate product, and the concentrated tailings are returned step by step.

2. The efficient flotation separation method of arsenic-containing copper-molybdenum ore according to claim 1, characterized in that: The adjusting agent KT2 is composed of 60-70% by mass of sodium sulfide and 30-40% by mass of potassium permanganate.

3. The efficient flotation separation method of arsenic-containing copper-molybdenum ore according to claim 1 is characterized in that: The collector KC-1 is composed of 30-40% by mass of isobutyl methyl ethyl sulfide ester, 50-60% by mass of kerosene and 10-20% by mass of pyridine.

4. The efficient flotation separation method of arsenic-containing copper-molybdenum ore according to claim 1, characterized in that: The foaming agent KA-1 is composed of 70-80% by mass of methyl isobutyl carbinol and 20-30% by mass of tripropylene glycol ethyl ether.

5. The efficient flotation separation method of arsenic-containing copper-molybdenum ore according to claim 1, characterized in that: The collector B is composed of butyl ammonium black medicine and diethyl dithiocarbamate propionitrile; or butyl xanthate and diethyl dithiocarbamate propionitrile; wherein ethyl dithiocarbamate propionitrile accounts for 70% to 80%.

6. The efficient flotation separation method of arsenic-containing copper-molybdenum ore according to claim 1, characterized in that: The foaming agent B is composed of pine oil and cyclohexanol, wherein the mass percentage of cyclohexanol is 40-60%.

7. The efficient flotation separation method of arsenic-containing copper-molybdenum ore according to claim 1, characterized in that: The copper inhibitor described in step C is one or more of sodium sulfide, sodium hydrosulfide and sodium thioglycolate.

8. The efficient flotation separation method of arsenic-containing copper-molybdenum ore according to claim 1, characterized in that: The neutral oil described in step C is kerosene and / or diesel.

9. The efficient flotation separation method of arsenic-containing copper-molybdenum ore according to claim 1, characterized in that: The sulfur-arsenic inhibitor in step E is composed of lime, sodium lignin sulfonate and polyacrylamide.

10. The efficient flotation separation method of arsenic-containing copper-molybdenum ore according to claim 1 or 9, characterized in that: The sulfur-arsenic inhibitor is composed of 60-80% by weight of lime, 10-20% by weight of sodium lignin sulfonate and 10-20% by weight of polyacrylamide.

Images