JPS63500577A - Selective separation method for copper molybdenum ore - Google Patents

Abstract

A process for separation of the mineral components of a copper/molybdenum sulfide ore by flotation including (a) crushing and grinding the ore to liberate the minerals; (b) in a primary flotation circuit, adding a molybdenum collector selected from the group of hydrocarbon oils, and a frother; (c) floating a primary (molybdenum) concentrate in the primary circuit in the absence of a copper collector; (d) directing the primary molybdenum concentrate to an upgrading separation circuit to produce a final molybdenum concentrate; and (e) directing the non-float of the primary circuit to a secondary scavenger circuit for recovery of copper and additional molybdenum with addition of a copper collector, the process being conducted at a natural pH essentially determined by the ore composition and the quality of the water used to form the pulp, without addition of substantial amounts of alkaline or acid pH modifiers sufficient to change the pH.

Description

[Detailed description of the invention] Selective separation method for copper molybdenum ore The present invention provides selective improvement of the composition of copper molybdenum (Mo-Cu) ore by flotation. Concerning separation methods. More specifically, the present invention also relates to the recovery of -order Pw1o-Cu concentrate. natural pH (i.e. pH) without the addition of copper scavengers in the primary flotation circuit. (without the addition of alkalis (e.g. lime) or acids in sufficient quantities to control the quality) Concerning such separation methods carried out in

Conventional technology Conventional flotation system for copper ores with recoverable molybdenum by-product values The ore is first treated with lime, which is usually added to suppress the pyrite. Crush and crush. The ore is then subjected to primary flotation after adding a copper scavenger and a foaming agent. Process in the mining circuit. The copper-loss concentrate thus obtained contains a large proportion of copper and molybdenum. Contains a substantial portion of deben. This blister concentrate is then subjected to cleaner flotation. The ore is subjected to several stages (usually after a re-grinding operation) to produce finished copper concentrate. This concentrate is It contains virtually all of the molybdenite recovered in blister copper. Next, copper concentrate A series of attempts to separate molybdenite as a high-purity concentrate, a by-product in many copper ores. Treated in a separation process.

The main problem with this system is that it necessarily results in a reduction in the available lime recovery. This is true.

Another major problem with conventional systems is the removal of molybdenum from copper concentrates with high reagent content. This requires budene recovery. For this reason, the separation of molybdenum from copper minerals is particularly difficult. A complex secondary separation system is required, which is expensive. This may require large amounts of copper inhibitor and result in reduced molybdenum recovery.

Purpose of invention One object of the present invention is to produce copper ore (with molybdenum as a by-product) by flotation. The object of the present invention is to provide a method for flotation separation of components of minerals. This method provides an acceptable grade of To provide a convenient, inexpensive, and efficient method for recovering molybdenum.

Another object of the present invention is that it can be carried out with natural pH-adjusting agents such as lime and other pH-adjusting agents. 11) Provide release properties to avoid the use of

Another object of the present invention is to provide such a separation which avoids the use of substantial amounts of inhibitors for copper minerals. It is to provide law.

Another object of the invention is to avoid the use of copper scavengers in secondary flotation circuits. Another object of the present invention is to provide a method of separation that is highly molybdenum. Because of the volume, further separation is possible with fewer reagents and virtually fewer cleaning steps. Molybdenum can be separated and made into molybdenum concentrate, and molybdenum is initially contained in the ore. One of the substantially molybdenum-rich concentrates giving increased recovery of mineral minerals. The next step is to achieve recovery in the flotation circuit. Copper content of this -order flotation circuit can be bypassed to the copper circuit after the cleaning stage. Therefore, the entire copper circuit of the system Yield is not compromised.

These and other objects of the invention will be apparent from this description, the appended claims, and the accompanying drawings. This will be readily apparent to those skilled in the art.

Disclosure of invention The present invention is useful for separating the mineral components of an ore (the ore is composed of copper sulfide and molybdenum sulfide). Minerals selected from the group consisting of base metal sulfides and pyrite, including livenane. (a) Crush the ore with water to obtain ore with a particle size distribution suitable for flotation. Prepare a stone valve; (b) - In the next flotation circuit, molybdenum capture selected from the group of hydrocarbon oils Add a scavenger together with a foaming agent, (C) In the absence of a copper scavenger, -subcopper molybdenum concentrate During flotation of the ore, this primary concentrate contains a portion of the copper minerals in the feed to the secondary circuit. ), (d) Molybdenum is recovered from the primary concentrate in the cleaner circuit and Direct the tailings toward the copper circuit, and (e) remove the non-floated matter from the secondary circuit with secondary copper molybdenum floating Recovering scavenger copper concentrate with a small portion of molybdenite for the beneficiation circuit. and a substantial amount of an alkaline or acidic pH adjusting agent sufficient to alter the pH. Without additives, depending on the ore composition and the water quality used to prepare the valve, The content of the mineral components of ore, which is characterized by the fact that it is carried out at natural pH. Concerning separation from law.

Brief description of the drawing Figure 1 shows the flowchart of the copper-molybdenum ore separation scheme by flotation according to the present invention. -It is a sheet.

Figure 2 shows the typical example of the Southwestern United Stave, which has run out of water. A water-balance flowchart for copper-molybdenum flotation as typically practiced. According to the present invention, copper ore containing associated molybdenum valuables from a mine is Crush and grind to particle size to prepare flotation feed and ore valves.

Pre-flotation conditioning of the ore, if any, may be carried out during the wet grinding stage or may be carried out after the wet milling stage and is completed before the first flotation stage. preconde mark 1 in Figure 1. According to the invention, at this stage it is necessary to The only preconditioning that may occur is very small amounts of sodium sulfide, peracid, Addition of redox agents such as hydrogen hydride, or aeration may be required. ore minerals The combined contributions from oxidation, degree of surface oxidation and water chemistry (if no modification) are: Different degrees of copper sulfide and sulfide together with molybdenite in the primary molybdenum coarse stage Iron mineral recovery can occur. Special features carried out during or after the grinding stage Pre-flotation conditioning of the ore with defined reagents is used to remove copper and iron sulfides. It may be necessary to prevent or minimize this recovery. Reagents used may have reducing properties, e.g. hypochlorite, peroxide or atmospheric be.

The required amounts are - copper sulfide and iron sulfide together with the molybdenite during the secondary molybdenum flotation stage. Just enough to prevent or minimize said recovery of. In other words, The amount of doxing agent, or the degree of aeration, preferably affects the molybdenite flotation. Useful for preventing or minimizing lead sulfide and pyrite flotation without is sufficient and does not affect pH. In most cases lime or other minerals No H regulator is added (or if it is, the lime is It is only used for protective alkalinity, i.e. to prevent equipment corrosion. (This is to stop

Do not add copper scavenger to the primary molybdenum flotation circuit. However, a small amount of hydrocarbon A base oil is added together with a foaming agent at 2 in FIG. 1 as a molybdenum scavenger.

Suitable hydrocarbon oils include steam oil, diesel oil, fuel oil, and the like.

Preferably the hydrocarbon will contain as little wax fraction as possible.

- The next flotation circuit produces crude molybdenum concentrate and non-flotation material containing some copper. Cheating.

This concentrate, which is substantially enriched in molybdenum compared to the normal circuit, is then used if necessary. Re-grind and direct to a cleaner stage resulting in the production of final molybdenum concentrate. Main departure The one-step cleaner simplification and cost savings achieved by Ru.

Direct the non-flotation material in the primary circuit to the copper flotation circuit. Non-floating materials include some copper and residue. Contains many non-transferring substances.

Add copper scavenger at 3 in FIG.

Whether to add an oxidizing/reducing agent (before primary flotation in 1 or 4 in Figure 1) (either before scavenger flotation) greatly reduces the natural oxidation of the ore. / Depends on the reducing conditions and the water used in the flotation process.

Copper loss concentrate is typically processed into final copper concentrate, Produce a final tailings product and optionally a secondary molybdenum concentrate. This latter concentrate is , due to the efficiency of the primary flotation circuit of the present invention in recovering molybdenite, during production: Represents a small percentage of the total molybdenum content of the original ore. This secondary molybdenum concentrate is -order molybdenum circuit or molybdenum cleaner circuit depending on the test may be recirculated.

Further separation of the scavenger concentrate is carried out in small quantities sufficient to minimize pyrite flotation. may require the addition of oxidizing/reducing agents.

The method of the invention does not require the use of cyanide.

Aeration replaces redox additives to control valve redox potential (or in addition to) used advantageously. Aeration is the second step in the flotation circuit. 1 or 4 in the first scavenger circuit.

The advantages of this publication include the simplification of flotation schemes and the elimination of lime and redundancy. Minimum (if any) addition of foaming agents and savings on foaming and scavenging agent consumption All reagent savings, including those resulting from approx.

Other benefits derive from improved molybdenum recovery and/or grade.

Molybdenum-copper ores suitable for the implementation of this publication include chalcopyrite and chalcopyrite-containing ores. Examples include copper sulfide-molybdenum sulfide ore.

This journal is particularly suitable for ore separation in water recycling plants. facts, books A separation plant that reuses most of the water as shown in Figure 2 (prior art) can be advantageously introduced. This includes reagents (scavengers and redox agents, if any) This is because they do not accumulate in recycled water since the addition of Second In the figure, approximately 6096 of the water in the system is recycled after the coarse concentrate flotation. Follow up Additional water is recycled from the non-float scavenger circuit 2. All reprint water merge at 3.

The invention will be further illustrated below with reference to specific examples. However, the present invention The scope of is not limited to these examples.

Example 1 Ore from the Chino Mines Division of the Nikenecott φ Copper Company. 500 g of copper-molybdenum ore containing mostly chalcopyrite.

Water: 350 ml Process H20 (from step 1 in Figure 2).

After pulverization (6 minutes), N a2S was subjected to a conditioning process (1 minute ) Added (50 g/ton ore) to the bulb and aerated the bulb for about 2 minutes under mixing, then I stopped the air.

Machining 2 drops of fuel oil into the valve with MIBC and 6 drops of foaming agent 2? Condition M In addition, the first scavenger concentrate was added during the flotation stage (2 minutes) and the first scavenger concentrate was flotated (4 minutes). minutes). Then add another 11 W of copper scavenger (2 minutes) and add the second scavenger concentrate. Flotation was carried out. Electrochemical potential measurements showed that the first conditioning stage , at the time of aeration, and in the rough concentrate and beneficiation process, and the first scaven +50 was found in the jar flotation process. pH during aeration 7.5 during conditioning, 7.8 during conditioning, 8.0 during flotation of secondary concentrate, It was 8.2 during flotation of secondary concentrate. The results are as follows: coarse concentrate 2.70 ! 3817.75 Bo, 7534.10 First Scaven 3.62 0.032 1g, 06 9.59 57.89 Jiyar concentrate Primary concentrate 5.79 0.147 17.94 70.35 91.99 Non-floating Item 94.21 0.0038 0.096 29.65 8.01 Calculation head 100.00 0.121 1.129 cases 2 Ore: 500 g of the same copper-molybdenum ore as in Example 1.

Water: Process H0 (from step 1 in Figure 2) 350 ml.

The ore was ground for 6 minutes and foaming agent only (2 drops of MIBC) was added. Fuel oil (6 drops) The first conditioning step was added (1 minute) and the valve was aerated for 2 minutes.

No sodium sulfide or other redox reagents were added.

Flotate the coarse concentrate (for 3 minutes) and condition the non-floated matter by adding 2 drops of copper scavenger. (2 minutes). Flotate the first scavenger concentrate (4 minutes) to remove the non-floating matter. After conditioning for 2 minutes with an additional drop of copper scavenger (2694,), the second Scavenger concentrate was flotated. The results were as follows.

Crude concentrate 0.720.878 g, 11 54.31 + 5.13 1st scaven 3.88 0.03B 24.42 12.01 83.29 Jiyar concentrate Primary concentrate 4.60 0.168 21.87 68J788. ．． 43 Non-floating matter 95.4. OO,00410,13833,B8 11.57 calculation head 1 00.00 0.011B 1.137 Jotomi (no change in content) Cu-MoJQδ 1 70-5-t Engraving (no changes to the content) Procedural amendment (Kun) November lK day, 1986

Claims (9)

[Claims] 1. In separating the mineral components of the ore (the ore is copper sulfide and molybdenum sulfide) base metal sulfides, including minerals selected from the group consisting of pyrite) (a) crushing and grinding the ore to liberate the mineral; (b) a primary flotation circuit; , a molybdenum scavenger selected from the group of hydrocarbon oils and a foaming agent are added. , (c) primary (molybdenum) concentrate in said primary circuit in the absence of a copper scavenger. flotation, (d) Directing the primary molybdenum concentrate to an improved separation circuit to prepare the final molybdenum concentrate. and (e) removing non-floated matter from said primary circuit by adding copper and adding a copper scavenger. secondary scavenger circuit for molybdenum recovery. a substantial amount of an alkaline or acidic pH modifier sufficient to alter the pH; depending on the ore composition and the quality of the water used to prepare the pulp, without the addition of Mineral composition of ores characterized by being carried out at essentially determined natural pH. Separation method of minutes. 2. Reduces copper sulfide and iron sulfide flotation in the pulp in the primary molybdenum circuit. 2. The method of claim 1, wherein the aeration is carried out for a sufficient period of time to minimize both. 3. Oxidizing or reducing agents, together with molybdenite, flotation of copper sulphide and iron sulphide. At a time prior to the addition of molybdenum scavenger in an amount sufficient to at least minimize The method of claim 2, wherein the method is added to ore. 4. The oxidizing or reducing agent is added with a molybdenum scavenger in an amount of about 0 to 50 g/ton ore. 3. The method of claim 2, wherein the ore is added to the ore at a point prior to addition. 5. The method according to claim 2, wherein said process is carried out without addition of said PH regulator. Law. 6. Further, a copper scavenger is added to the non-floating material to flotate the copper concentrate. Method in section 1. 7. Oxidizing/reducing agents are added to maximize the non-floating nature of pyrite at the natural HP of the system. To the extent possible, the claim is to flotate the blister copper concentrate for further improvement to the final copper concentrate. The method of item 6 within the scope of 8. 5. The method of claim 4, wherein the agent is a sulfide ion. 9. 8. The method of claim 7, wherein said agent is added in an amount of about 0-50 g/ton ore. .