A method for preparing crude copper from multiple mineral sources

Abstract

The application provides a method for preparing crude copper from multi-source ore, and belongs to the technical field of copper product production. The method comprises the following steps: mixing different ore raw materials according to the phase composition of the different ore raw materials to obtain ore and complete primary proportioning; determining the proportion of the ore and the proportion of each raw ore according to the phase composition of the raw ore, the phase composition of the ore and the production requirements of the raw material into the furnace to complete secondary proportioning; calculating the total oxygen consumption according to a preset matte grade; mixing the raw ore, the ore and a flux into the furnace according to the proportion determined by the secondary proportioning, and then sequentially performing smelting and converting by inputting the total oxygen consumption of oxygen to obtain crude copper. The application improves the quality stability of the crude copper by proportioning according to the phase composition of the raw material.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of copper product production, and particularly relates to a method for preparing blister copper from multiple sources of ore. BACKGROUND

[0002] With the increasing consumption of copper resources, high-quality copper concentrates are becoming less and less, and copper smelting enterprises have to focus on mixed ores and poor ores. In addition, the return materials produced in the copper smelting process, such as smelting slag, contain a high amount of copper, and the slag concentrate with a high copper content obtained by slag selection can be used as raw material for smelting and smelting again. However, because of the complex impurity composition, it brings great production pressure to copper smelting enterprises. Preparing blister copper by blending mixed ores, high-quality ores, return materials and copper concentrates is the most important link in the measures to reduce the influence of mixed ores and return materials. However, the blending in the prior art is usually performed by experience, which can lead to unstable quality of the blister copper produced. SUMMARY

[0003] The present application relates to the technical field of copper product production, and particularly relates to a method for preparing blister copper from multiple sources of ore.

[0004] In order to achieve the above-mentioned application purposes, the present application provides the following technical solutions:

[0005] The present application provides a method for preparing blister copper from multiple sources of ore, comprising the following steps:

[0006] According to the phase composition of different mixed ore raw materials, different mixed ores are obtained by mixing different mixed ore raw materials, and primary blending is completed.

[0007] According to the phase composition of each raw ore, the phase composition of the mixed ore and the production requirements of the raw material into the furnace, the proportion of the mixed ore and the proportion of each raw ore are determined, and secondary blending is completed.

[0008] The total oxygen consumption is calculated according to the preset blister copper grade.

[0009] According to the proportion determined by the secondary blending, the raw ore, the mixed ore and the flux are mixed into the furnace, and then oxygen with the total oxygen consumption is introduced to sequentially perform smelting and blowing, so as to obtain blister copper.

[0010] Preferably, the raw ore includes one or more of high-quality ore, return material and copper concentrate.

[0011] Preferably, the content of Cu in the mixed ore is 10-15wt%, the content of Pb+Zn is 1-5wt%, the content of As is 0.5-1.5wt%, and the content of Bi+Sb is 0.3-0.8wt%.

[0012] Preferably, the production requirements of the raw material into the furnace include one or more of sulfur-copper ratio, iron-silicon ratio, coal blending rate and impurity element content.

[0013] Preferably, the impurity elements include one or more of As, Sb and Bi.

[0014] Preferably, the total oxygen consumption = O2(FeS) + O2(S2) per ton of raw material into the furnace; the raw material into the furnace includes each raw material ore, mixed ore and flux into the furnace;

[0015] The O2(FeS) is the oxygen required for the generation of FeS, and the O2(S2) is the oxygen required for the generation of S2;

[0016] The calculation formula of O2(FeS) is shown as formula I:

[0017]

[0018] The calculation formula of O2(S2) is shown as formula II:

[0019]

[0020] Wherein, mCuFeS2, mFeS2, mFe3O4 are the mass of CuFeS2, FeS2 and Fe3O4 respectively, Kg; Cup is the set smelting matte grade, %.

[0021] Preferably, the flux includes quartz sand.

[0022] Preferably, it also includes: correcting the matte grade fluctuation in the smelting process through the proportion of copper concentrate, return material, high-quality ore and mixed ore in the furnace.

[0023] The present application provides a method for preparing crude copper from multi-source ore, including the following steps: mixing different mixed ore raw materials according to the phase composition of different mixed ore raw materials to obtain mixed ore and complete the initial proportioning; determining the proportion of mixed ore and the proportion of each raw material ore according to the phase composition of each raw material ore, the phase composition of mixed ore and the production requirements of raw material into the furnace to complete the secondary proportioning; calculating the total oxygen consumption according to the preset matte grade; mixing the each raw material ore, mixed ore and flux into the furnace according to the proportion determined by the secondary proportioning, and then passing the total oxygen consumption of oxygen to sequentially smelt and convert to obtain crude copper. The present application improves the quality stability of crude copper by proportioning according to the phase composition of raw materials. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 The process flow chart of the embodiment of the present application;

[0025] Figure 2 The ore proportioning setting and result diagram of return material and flux of embodiment 1;

[0026] Figure 3A schematic diagram of the setting and results of the charging raw material of Example 1. DETAILED DESCRIPTION

[0027] The application provides a method for preparing crude copper from multi-source ores, comprising the following steps:

[0028] According to the phase composition of different miscellaneous ore raw materials, the miscellaneous ores are obtained by mixing different miscellaneous ore raw materials, and primary blending is completed.

[0029] According to the phase composition of each raw ore, the phase composition of the miscellaneous ore and the production requirements of the charging raw material, the proportion of the miscellaneous ore and the proportion of each raw ore are determined, and secondary blending is completed.

[0030] The total oxygen consumption is calculated according to the preset matte grade.

[0031] According to the proportion determined by the secondary blending, the each raw ore, the miscellaneous ore and the flux are mixed into the furnace, and then oxygen with the total oxygen consumption is introduced to sequentially perform smelting and blowing, so as to obtain crude copper.

[0032] According to the phase composition of different miscellaneous ore raw materials, the miscellaneous ores are obtained by mixing different miscellaneous ore raw materials, and primary blending is completed.

[0033] In the application, the content of Cu in the miscellaneous ore is preferably 10-15wt%, the content of Pb+Zn is preferably 1%-5wt%, the content of As is preferably 0.5-1.5wt%, and the content of Bi+Sb is preferably 0.3-0.8wt%.

[0034] After the primary blending is completed, the proportion of the miscellaneous ore and the proportion of each raw ore are determined according to the phase composition of each raw ore, the phase composition of the miscellaneous ore and the production requirements of the charging raw material, and the secondary blending is completed.

[0035] In the application, the raw ore preferably includes one or more of high-quality ore, return material and copper concentrate; the copper concentrate is preferably divided into low-impurity copper concentrate and high-impurity copper concentrate; the low-impurity copper concentrate preferably includes Cu>20%, Pb+Zn<8%, As<0.2, Bi+Sb<0.4 in mass fraction; and the high-impurity copper concentrate preferably includes Cu<20%, Pb+Zn>8%, As>0.2, Bi+Sb>0.4 in mass fraction.

[0036] The high-quality ore preferably includes Cu>25%, Pb+Zn<5%, As<0.2, Bi+Sb<0.3 in mass fraction.

[0037] In the application, the return material preferably includes slag concentrate and / or oxidized slag.

[0038] In the present application, the indicators required by the production of the furnace charging raw material preferably include one or more of the sulfur-copper ratio, the iron-silicon ratio, the coal blending rate and the impurity element content, and more preferably include the sulfur-copper ratio and the iron-silicon ratio.

[0039] In the present application, the sulfur-copper ratio is preferably 1-1.4; the calculation method of the sulfur-copper ratio is the sulfur in the secondary blending raw material / the copper in the initial blending raw material.

[0040] In the present application, the iron-silicon ratio is preferably 2-4; the calculation method of the iron-silicon ratio is the iron in the secondary blending raw material / the silicon dioxide in the initial blending raw material.

[0041] In the present application, the impurity element preferably includes one or more of As, Sb and Bi.

[0042] In the present application, the calculation method of the proportion of miscellaneous ore in the secondary blending and the proportion of each raw ore is as follows:

[0043]

[0044] wherein α Cur , α Fer , α Ser , α SiO2r , α Asr , α Sbr , α Bir is the percentage content of copper, iron, sulfur, silicon dioxide, arsenic, antimony and bismuth elements contained in the secondary blending raw material; x1-x n is the proportion of miscellaneous ore and the proportion of each raw ore; As, Sb and Bi are the impurity element content in the production requirements of the furnace charging raw material.

[0045] After the secondary blending is determined, the present application calculates the total oxygen consumption according to the preset copper matte grade.

[0046] In the present application, the total oxygen consumption = O2(FeS) + O2(S2) per ton of furnace charging raw material.

[0047] The furnace charging raw material includes copper concentrate, return material, high-quality ore, miscellaneous ore, coal powder and flux.

[0048] The calculation formula of O2(FeS) is shown as formula I:

[0049]

[0050] The calculation formula of O2(S2) is shown as formula II:

[0051]

[0052] Wherein, mCuFeS2, mFeS2, mFe3O4 are the mass of CuFeS2, FeS2, Fe3O4 respectively, Kg; Cup is the set smelting matte grade, %.

[0053] After the total oxygen consumption is obtained, the raw ore, mixed ore and flux are mixed into the furnace according to the proportion determined by the secondary batching, and then oxygen with the total oxygen consumption is introduced to sequentially perform smelting and converting to obtain crude copper.

[0054] In the present application, the flux preferably includes quartz sand.

[0055] The present application preferably corrects the matte grade fluctuation in the smelting process by adjusting the proportion of copper concentrate, return material, high-quality ore and mixed ore in the raw material into the furnace.

[0056] The present application does not have special limitations on the amount of coal powder and the smelting conditions, and the scheme well known to those skilled in the art can be used to make it easy to remove impurities, easy to control the slag type and stable matte grade.

[0057] In the present application,

[0058] The addition amount of the flux is:

[0059] AR is the addition amount of the flux; Fe is the proportion of the element Fe into the furnace; Fe / SiO2 is the set iron-silicon ratio; YSiO2 is the proportion of the element SiO2 into the furnace; RSiO2 is the proportion of SiO2 in the flux.

[0060] When the copper concentrate is low-impurity copper concentrate, the matte grade after smelting is 65-75%, and the oxygen concentration during converting is preferably 20-22%; when the copper concentrate is low-impurity copper concentrate, the matte grade after smelting is 50-60%, and the oxygen concentration during converting is preferably 22-24%.

[0061] The process flow of the method for preparing crude copper from multi-source ore according to the present application is shown in Figure 1 The multi-source copper concentrate is divided into low-impurity copper concentrate and high-impurity copper concentrate according to the element proportion; then primary batching, secondary batching, tertiary batching are performed respectively to obtain high-grade copper and low-grade copper, and then converting is performed respectively to obtain crude copper.

[0062] The method for preparing crude copper from multi-source ore according to the present application will be described in detail below in conjunction with examples, but they should not be understood as limiting the scope of protection of the present application.

[0063] Example 1

[0064] Different mixed ore raw materials are mixed according to the phase composition of different mixed ore raw materials to obtain mixed ore, and the element content proportion of the mixed ore is shown in Table 1;

[0065] The phase composition of different raw material ores is analyzed. The element content proportions of the raw materials are shown in Table 1.

[0066] Table 1 Element content proportions in different raw material ores, miscellaneous ores and quartz sand

[0067] Raw material Cu Fe S SiO2 CaO Pb Zn As MgO Copper concentrate 1 / wt% 17 34 39 2.37 0.31 0.27 0.72 0.14 0.54 High grade ore / wt% 27.27 28 33.4 2.58 1.15 0.28 3.00 0.17 0.34 Copper concentrate 2 / wt% 22.77 21 27 11.3 2.11 0.1 0.13 0.2 1 Scrap ore / wt% 12.38 21.56 14.5 11.4 3.75 0.81 1.01 1.13 1.81 Slag concentrate / wt% 23.55 23.45 10.31 12.01 2.14 1.11 2.23 0.21 0.42 Oxidized slag / wt% 23.44 23.61 7.31 12.01 1.01 0.92 0.02 0.72 0.80 Quartz sand / wt% 0 0 0 90 1 0 0 0 1 Raw material Al2O3 Sb Bi Ni Sn F Cl H2O Copper concentrate 1 / wt% 1.44 0 0.07 0 0 0.08 0.15 9.54 High grade ore / wt% 2.23 0.2 0.05 0.01 0.23 0.05 0.04 9 Copper concentrate 2 / wt% 3.32 0.04 0.03 0.03 0.15 0.04 0.47 10 Scrap ore / wt% 2.11 0.28 0.02 0.02 0.01 0.05 0.02 12 Slag concentrate / wt% 1.01 0.12 0 0 0 0 0 3 Oxidized slag / wt% 1.34 0.27 0.06 0.17 0.08 0 0 3 Quartz sand / wt% 5 0 0 0 0 0 0 2

[0068] The Cu content of the miscellaneous ore in the initial proportioning result is 12.38wt%, the Pb+Zn content is 1.82wt%, the As content is 1.13wt%, and the Bi+Sb content is 0.3wt%.

[0069] In the secondary proportioning, according to the production requirements, the content proportions of Cu, S, Fe and SiO2 are 19wt%, 25wt%, 26wt% and 7wt% respectively. The sulfur-copper ratio is 1.316, the iron-silicon ratio is 3.59, the impurity element contents are Pb+Zn<2.6wt%, As<0.3wt%, and Bi+Sb<0.38wt%, and the operation is as follows:

[0070]

[0071] The proportions of each ore are as follows: copper concentrate 1 (mineral 1 in Table 1): 21.9wt%, high-quality ore (mineral 2 in Table 1): 25.78wt%, copper concentrate 2 (mineral 4 in Table 1): 8.49wt%, miscellaneous ore (mineral 3 in Table 1): 33.82wt%, and returned material: 10wt% (the mass ratio of slag concentrate to oxidized slag is 1:1). Figure 3 Figure 3 Figure 3 Figure 3

[0072] The element content proportions in the raw materials after secondary proportioning are shown in Table 2.

[0073] Table 2 Element content proportions in raw materials after secondary proportioning

[0074] Raw material Cu Fe S SiO2 CaO Pb Zn As MgO Mixed ore 19.2 25.85 25.2 7.2 1.96 0.51 1.38 0.52 0.96 Raw material Al2O3 Sb Bi Ni Sn F Cl H2O Mixed ore 2 0.17 0.04 0.02 0.08 0.05 0.09 9.61

[0075] The iron-silicon ratio after adding flux is set to 1.8, and the total mass of quartz sand added in the secondary proportioning is 7.958%. The element content proportions of the raw materials entering the furnace are shown in Table 3.

[0076] Table 3 Element content proportions of raw materials entering the furnace

[0077]

[0078]

[0079] ​​​​For the matte grade floating caused by material fluctuation and production data fluctuation, the proportion of the charging ore is fine-tuned, the sulfur-copper ratio, the iron-silicon ratio, and the coal blending rate and flux rate are fine-tuned and modified according to various indexes of smelting products. The specific operation is to adjust the speed of the conveying belt carrying the material to change the size of the feed amount.

[0080] The formula of oxygen consumption for the reaction of FeS to generate FeO:

[0081]

[0082] The formula of oxygen consumption for the reaction of S2 to generate SO2:

[0083]

[0084] Total oxygen consumption = O2(FeS) + O2(S2) = 15721.8 m 3 / h;

[0085] Wherein, mCuFeS2, mFeS2, mFe3O4 are the mass of the charging chalcopyrite, pyrite and magnetite, which are 55.45 Kg, 15.45 Kg and 2.48 Kg respectively; Cup is the set smelting matte grade 70%.

[0086] The proportion of the charging ore is fine-tuned, and the sulfur-copper ratio, the iron-silicon ratio and other conditions are readjusted to obtain a new proportion to adapt to production fluctuations during the smelting process, and the conveying belt speed is adjusted to change the feed amount. By adjusting the feed speed, the proportion of the charging raw material is slightly changed, and under the condition of stable furnace condition, the smelting result is corrected. Subsequently, different conditions of converter blowing are carried out by different grades of copper matte (low-grade matte (50%-60%) is subjected to long-period blowing, and the blowing time is 7-8 hours; high-grade matte (65%-75%) is subjected to short-period blowing, and the blowing time is 3-4 hours), and 98.5% grade of crude copper is produced.

[0087] The above only describes the preferred embodiments of the present application, and it should be noted that for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A process for the production of blister copper from a poly-metallic ore, characterised in that, The method comprises the following steps: According to the phase composition of different raw materials, the different raw materials are mixed to obtain a mixed ore, and primary proportioning is completed; According to the phase composition of each raw material, the phase composition of the mixed ore, and the production requirements of the raw material into the furnace, the proportion of the mixed ore and the proportion of each raw material are determined, and secondary proportioning is completed; the indicators of the production requirements of the raw material into the furnace include the sulfur-copper ratio and the iron-silicon ratio; The total oxygen consumption is calculated according to the preset matte grade; According to the proportion determined by the secondary proportioning, the each raw material, the mixed ore, and the flux are mixed into the furnace, and then oxygen with the total oxygen consumption is introduced to sequentially perform smelting and converting to obtain crude copper; The flux includes quartz sand; The addition amount of the flux is: A R Fe: the amount of the added flux; Fe: the proportion of the element Fe charged into the furnace; Fe / SiO2: the set iron-silicon ratio; YSiO2: the proportion of the element SiO2 charged into the furnace; RSiO2: the proportion of SiO2 in the flux The total oxygen consumption = O2(FeS) + O2(S2) per ton of raw material into the furnace; the raw material into the furnace includes each raw material, mixed ore, and flux into the furnace; O2(FeS) is the oxygen consumed by FeS, and O2(S2) is the oxygen consumed by S2; The calculation formula of O2(FeS) is shown as formula I: Formula I; The calculation formula of O2(S2) is shown as formula II: Formula II; Wherein, mCuFeS2, mFeS2, and mFe3O4 are the mass of CuFeS2, FeS2, and Fe3O4, respectively, Kg; Cup is the set smelting matte grade, %.

2. The method of claim 1, wherein, The raw material includes one or more of high-quality ore, return material, and copper concentrate.

3. The method of claim 1, wherein, The content of Cu in the mixed ore is 10-15wt%, the content of Pb+Zn is 1-5wt%, the content of As is 0.5-1.5wt%, and the content of Bi+Sb is 0.3-0.8wt%.

4. The method of claim 1, wherein, The indicators of the production requirements of the raw material into the furnace also include one or both of the coal blending rate and the impurity element content.

5. The method of claim 4, wherein, The impurity elements include one or more of As, Sb, and Bi.

6. The method of claim 2, wherein, It also includes: The matte grade fluctuation in the smelting process is corrected by the proportion of copper concentrate, return material, high-quality ore, and mixed ore into the furnace.

Images