Copper-molybdenum mixed concentrate copper-molybdenum flotation separation method

Abstract

The application discloses a copper-molybdenum mixed concentrate copper-molybdenum flotation separation method, which comprises the steps of pretreatment, rough selection, fine selection and scavenging, and specifically comprises the following steps: slurry treatment of the copper-molybdenum mixed concentrate to be treated to obtain material a with a concentration of 20-35 %; sodium sulfide is added to the material a and stirred for 5-10 min, and dehydration and medicine removal are carried out by thickening to obtain thickening underflow b and backwater, and the backwater is recycled; the thickening underflow b is adjusted to a slurry concentration of 15-30 %, and a copper-molybdenum combined inhibitor and kerosene are sequentially added for flotation to obtain molybdenum rough concentrate c and copper rough concentrate d; the molybdenum rough concentrate c is subjected to four-stage fine selection to obtain molybdenum concentrate, and the fine selection tailings are returned to the previous step for circulation; the copper rough concentrate is added with the copper-molybdenum combined inhibitor and kerosene for two-stage scavenging to obtain copper concentrate, and the scavenging tailings are returned to the previous step for circulation.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of comprehensive utilization of mines, and particularly relates to a copper-molybdenum flotation separation method for copper-molybdenum mixed concentrate. BACKGROUND

[0002] The copper-molybdenum mixed concentrate in the Tongkuangyu mine has a molybdenum content of 0.1%-0.4%. In order to realize copper-molybdenum separation in the Tongkuangyu mine concentrator, comprehensively recover the valuable metal molybdenum, improve the economic benefits of mine products, carry out research on copper-molybdenum separation technology, research and develop the optimal flotation process and reagent system for copper-molybdenum separation, and evaluate the comprehensive utilization efficiency of resources. SUMMARY

[0003] The application aims to provide a copper-molybdenum flotation separation method for copper-molybdenum mixed concentrate.

[0004] The application is achieved in the following manner. The copper-molybdenum flotation separation method for copper-molybdenum mixed concentrate comprises the steps of pretreatment, roughing, cleaning and scavenging, and specifically comprises the following steps.

[0005] A. Pretreatment:

[0006] 1) The copper-molybdenum mixed concentrate to be treated is slurried to a concentration of 20-35% to obtain material a;

[0007] 2) Sodium sulfide is added to the material a and stirred for 5-10 min, and dehydration and drug removal are performed by thickening to obtain thickening underflow b and backwater, and the backwater is recycled;

[0008] B. Roughing: The thickening underflow b is adjusted to a slurry concentration of 15-30%, and a copper-molybdenum combined inhibitor and kerosene are sequentially added for flotation to obtain molybdenum rough concentrate c and copper rough concentrate d;

[0009] C. Cleaning: The molybdenum rough concentrate c is subjected to four-stage cleaning to obtain molybdenum concentrate, and the cleaning tailings are returned to the previous step for circulation;

[0010] D. Scavenging: The copper rough concentrate is added with a copper-molybdenum combined inhibitor and kerosene for two-stage scavenging to obtain copper concentrate, and the scavenging tailings are returned to the previous step for circulation;

[0011] The copper-molybdenum combined inhibitor is composed of sodium sulfide and D117. The D117 is a mixture of sodium dithiophosphate, sodium monothiophosphate and sodium sulfide, and is generated by the reaction of sodium hydroxide (concentration 20-40%) and phosphorus pentasulfide (concentration 20-40%) under normal pressure. The reaction is an exothermic reaction, and the molar ratio of sodium hydroxide to phosphorus pentasulfide is 5:1 to 10:1.

[0012] The copper-molybdenum separation process adopting the sodium sulfide drug removal-sodium sulfide+D117 combination to cooperatively inhibit copper-molybdenum is reliable and stable, the reagent system is simple, the reagent cost is controllable, the process adaptability is good, and the comprehensive recovery of low-grade molybdenum is relatively advantageous.

[0013] The conventional process method is: copper-molybdenum mixed concentrate thickening dehydration drug removal-addition of copper mineral inhibitor to inhibit copper mineral and float molybdenum mineral-rough concentrate regrinding and multi-stage cleaning to obtain final molybdenum concentrate. The process method of the application is: adding a drug removal agent to the copper-molybdenum mixed concentrate slurry and stirring-thickening dehydration drug removal-addition of copper mineral inhibitor to inhibit copper and float molybdenum-rough concentrate regrinding and multi-stage cleaning to obtain final molybdenum concentrate. The process of the application can enhance the drug removal effect of the copper-molybdenum mixed concentrate, enhance the copper-molybdenum separation effect, and reduce the total reagent dosage. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a process flow diagram of the application;

[0015] Figure 2 It is a conventional process flow diagram. DETAILED DESCRIPTION

[0016] The application will be further described below in conjunction with examples, but in no way limits the application, any transformation or replacement based on the teaching of the application belongs to the protection scope of the application.

[0017] The copper-molybdenum flotation separation method of the copper-molybdenum mixed concentrate includes pretreatment, roughing, cleaning and scavenging steps, and specifically includes:

[0018] A, pretreatment:

[0019] 1) The copper-molybdenum mixed concentrate to be treated is slurried to a concentration of 20-35% to obtain material a;

[0020] 2) Sodium sulfide is added to the material a and stirred for 5-10 min, dehydration and drug removal are performed by thickening to obtain thickening underflow b and backwater, and the backwater is recycled;

[0021] B, roughing: the thickening underflow b is adjusted to a slurry concentration of 15-30%, and the copper-molybdenum flotation inhibitor combination and kerosene are sequentially added for flotation to obtain molybdenum rough concentrate c and copper rough concentrate d;

[0022] C, cleaning: the molybdenum rough concentrate c is subjected to four-stage cleaning to obtain molybdenum concentrate, and the cleaning tailings are returned to the previous step for circulation;

[0023] D, scavenging: the copper-molybdenum flotation inhibitor combination and kerosene are added to the copper rough concentrate for two-stage scavenging to obtain copper concentrate, and the scavenging tailings are returned to the previous step for circulation;

[0024] The copper-molybdenum separation agent is composed of sodium sulfide and D117, wherein the D117 is a mixture of sodium dithiophosphate, sodium monothiophosphate and sodium sulfide, and is generated by reacting sodium hydroxide (concentration of 20-40%) with phosphorus pentasulfide (concentration of 20-40%) under normal pressure, and the reaction is an exothermic reaction, and the molar ratio of sodium hydroxide to phosphorus pentasulfide is 5:1 to 10:1.

[0025] The mass ratio of sodium sulfide to D117 is (1-10):1.

[0026] The application will be further described below by specific implementation cases:

[0027] Example 1

[0028] The copper-molybdenum mixed concentrate has a copper grade of 23.5% and a molybdenum grade of 0.30%, and the copper-molybdenum mixed concentrate is subjected to the separation method of inhibiting copper minerals and floating molybdenum minerals, and the separation process adopts the process flow of the application, as shown in Figure 1 , and the separation results are shown in Table 1. The molybdenum concentrate with a molybdenum grade of 45.17% and a molybdenum recovery rate of 65.44% can be obtained, the copper concentrate with a copper grade of 23.65% and a copper recovery rate of 99.98% can be obtained. The sodium sulfide is a stripping agent in the process, and is also an inhibitor of copper minerals, and the total amount is 4.2 kg.

[0029] Table 1 Copper-molybdenum separation results (%)

[0030]

[0031] Comparative Example 1

[0032] The process flow of the conventional method is shown in Figure 2 , and the separation results are shown in Table 2. The molybdenum concentrate with a molybdenum grade of only 39.77% and a molybdenum recovery rate of 73.08% can be obtained, the copper concentrate with a copper grade of 23.55% and a copper recovery rate of 99.95% can be obtained. The total amount of sodium sulfide in the process is 5.2 kg.

[0033] Table 2 Copper-molybdenum separation results (%) of the conventional method

[0034]

[0035] Example 2

[0036] Copper-molybdenum separation flotation test research

[0037] There are two methods for copper-molybdenum separation flotation: one is to inhibit copper and float molybdenum, and the other is to inhibit molybdenum and float copper. At present, most domestic and foreign manufacturers choose the first method. The application mainly adopts the method of inhibiting copper and floating molybdenum to carry out copper-molybdenum separation flotation test research, and the main research contents are as follows:

[0038] The influence of diesel on copper-molybdenum separation was studied, and the influence of impurity inhibitors on copper-molybdenum separation was studied to explore the influence of gangue and other impurity minerals on copper-molybdenum separation.

[0039] The copper-molybdenum separation technical index of the copper-molybdenum mixed concentrate after stirring and removing the reagent did not meet the contract requirements, so the copper-molybdenum separation test of sodium sulfide was carried out to examine the influence of sodium sulfide on copper-molybdenum separation. The condition test and small closed-circuit test were carried out by adopting the principle process scheme of sodium sulfide stirring and removing the reagent-D117 synergistic copper inhibition and molybdenum flotation.

[0040] 1. Sodium sulfide dosage test

[0041] After the copper-molybdenum mixed concentrate was stirred with sodium sulfide for 5 minutes, the supernatant was removed, and the thickened slurry entered the copper-molybdenum separation process. The dosage of the copper-molybdenum separation roughing reagent D117 was 2000 g / t, the dosage of diesel was 20 g / t, and the roughing concentration was 18%. The sodium sulfide dosage test was carried out, and the test results are shown in Table 3:

[0042] Table 3 Sodium sulfide dosage test results / %

[0043]

[0044] The test results show that with the increase of sodium sulfide dosage, the molybdenum concentrate grade gradually increases, and the molybdenum recovery rate gradually decreases. Considering the test, the sodium sulfide dosage is selected as 5 kg / t.

[0045] 2. Single sodium sulfide dosage test

[0046] After sodium sulfide was removed, the single sodium sulfide dosage test was carried out, the dosage of diesel was 20 g / t, and the roughing concentration was 18%. The test results are shown in Table 4:

[0047] Table 4 Single sodium sulfide dosage test results / %

[0048]

[0049] The test results show that after sodium sulfide is removed, single sodium sulfide is used for copper-molybdenum separation, and the sodium sulfide dosage is reduced under similar molybdenum concentrate index, indicating that the sodium sulfide removal effect is better than the stirring removal effect. With the increase of sodium sulfide dosage, the rough concentrate Mo grade gradually increases, and the molybdenum recovery rate tends to be stable.

[0050] 3. Single D117 dosage test

[0051] After sodium sulfide was removed, the single D117 dosage test was carried out, the dosage of diesel was 20 g / t, and the roughing concentration was 18%. The test results are shown in Table 5:

[0052] Table 5 D117 dosage test results / %

[0053]

[0054] The test results show that after the sodium sulfide is removed, the copper-molybdenum separation is carried out by using single D117 to inhibit copper from floating molybdenum, and under similar molybdenum concentrate indexes, the D117 dosage is reduced, which indicates that the subsequent inhibitor dosage can be reduced by using sodium sulfide to remove the medicine. With the increase of the D117 dosage, the molybdenum grade of the rough concentrate gradually increases, and the Mo recovery rate gradually decreases. Considering the grade and the recovery rate, the D117 dosage of 2000g / t is selected in this test.

Claims

1. A copper-molybdenum bulk concentrate copper-molybdenum flotation separation method, characterized by, The copper-molybdenum mixed concentrate copper-molybdenum flotation separation method comprises the steps of pretreatment, roughing, cleaning and scavenging, and specifically comprises the following steps: A. Pretreatment: 1) The copper-molybdenum mixed concentrate to be treated is slurried to a concentration of 20-35% to obtain material a; 2) Sodium sulfide is added to the material a and stirred for 5-10 min, and dehydration and medicine removal are performed by thickening to obtain thickening underflow b and backwater, and the backwater can enter a copper-molybdenum ore beneficiation total backwater circulation treatment system; B. Roughing: The thickening underflow b is adjusted to a pulp concentration of 15-30%, and a copper-molybdenum combined inhibitor and kerosene are sequentially added for flotation to obtain molybdenum rough concentrate c and copper rough concentrate d; C. Cleaning: The molybdenum rough concentrate c is subjected to four-stage cleaning to obtain molybdenum concentrate, and the cleaning tailings are returned to the previous step for circulation; D. Scavenging: The copper rough concentrate is added with a copper-molybdenum combined inhibitor and kerosene for two-stage scavenging to obtain copper concentrate, and the scavenging concentrate is returned to the previous step for circulation; The copper-molybdenum combined inhibitor is composed of sodium sulfide and D117, and the D117 is a mixture of sodium dithiophosphate, sodium monothiophosphate and sodium sulfide; The mass ratio of the sodium sulfide to the D117 is (1-10):1; The D117 is generated by the reaction of sodium hydroxide and phosphorus pentasulfide under normal pressure; the molar ratio of the sodium hydroxide to the phosphorus pentasulfide is 5:1 to 10:

1.

2. The copper-molybdenum bulk concentrate copper-molybdenum flotation separation method according to claim 1, characterized in that, The mass percentage concentration of the sodium hydroxide is 20-40%.

3. The copper-molybdenum bulk concentrate copper-molybdenum flotation separation method of claim 1, wherein, The mass percentage concentration of the phosphorus pentasulfide is 20-40%.

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