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A chemical analysis method of copper phase in copper concentrate

A technology of copper concentrate and physical phase, applied in the field of chemical analysis, to avoid inaccurate measurement and ensure the safety of the measurement process

Active Publication Date: 2022-05-24
南京海关工业产品检测中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problem of using liquid bromine to dissolve copper sulfide in the existing national standard, the present invention provides a chemical analysis method for copper phase in copper concentrate, which uses dilute nitric acid and dilute sulfuric acid to avoid the use of highly toxic liquid bromine. Ensure the measurement process is more secure

Method used

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  • A chemical analysis method of copper phase in copper concentrate
  • A chemical analysis method of copper phase in copper concentrate
  • A chemical analysis method of copper phase in copper concentrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] According to the previous experimental results and the relative significance of various copper substances in smelting and customs supervision, the various copper phases in imported copper concentrates can be divided into four categories, namely water-soluble copper (mainly bile vitriol and water bila vitriol) , copper oxide (mainly copper ore, black copper ore), natural copper, copper sulfide (mainly chalcopyrite, bornite, chalcocite, copper blue). The main experimental steps of the chemical analysis method of copper phase in copper concentrate are as follows:

[0047] 1. After taking a representative sample according to the regulations, after mixing, shrinking, grinding, and passing through a 150-mesh sieve, the sample to be tested is obtained;

[0048] 2. Use X-ray fluorescence spectroscopy (XRF) to qualitatively analyze the elements in the sample to be tested;

[0049] 3. Use X-ray diffraction (XRD) and qualitatively analyze the copper phase in the sample to be test...

Embodiment 2

[0060] A certain imported copper concentrate sample is processed according to the experimental process in Example 1 to obtain XRF and XRD patterns such as: figure 2 , image 3 As shown, it can be known that the imported copper concentrate sample species contains bile vitriol (belongs to water-soluble copper), chalcopyrite (belongs to copper oxide), chalcopyrite and bornite (belongs to copper sulfide) phases, and the natural copper content low, not clearly shown in the map.

[0061] The contents of water-soluble copper, copper oxide and natural copper measured by atomic absorption spectrometry are: 6.05% (distributed 25.74% of the total copper content), 0.15% (distributed 0.64%), 0.08% (distributed 0.34%); The copper sulfide content by titration was 17.20% (73.28% allocated) and the total copper content was 23.48%.

[0062] The imported copper concentrate was artificially added with copper sulfate and copper sulfide, and a standard addition recovery experiment was carried ou...

Embodiment 3

[0069] To another batch of imported copper concentrate, handle according to the experimental flow in Example 1, obtain XRF and XRD spectrum such as: Figure 4 , Figure 5 As shown, it can be known that the imported copper concentrate sample species contains chalcopyrite (belonging to copper oxide) and chalcopyrite (belonging to copper sulfide) phases, and the water-soluble copper content is low, which is not clearly displayed in the map.

[0070] The contents of water-soluble copper, copper oxide and natural copper measured by atomic absorption spectrometry are: 0.008% (distribution 0.03%), 0.026% (distribution 0.10%), 0% (distribution 0%); copper sulfide measured by titration The content of 26.30% (99.87% distribution).

[0071] The imported copper concentrate was artificially added with copper sulfate and copper sulfide, and a standard addition recovery experiment was carried out. The recovery rate was 90-110%, which could verify the accuracy of the method.

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Abstract

The invention discloses a chemical analysis method for copper phase in copper concentrate, which belongs to the field of chemical analysis. The method comprises the following steps: S1 separating the water-soluble copper in the copper concentrate to be tested, and determining the content of the water-soluble copper by atomic absorption method; S2 separating the copper oxide in the filter residue A obtained in step S1, and measuring the content of copper oxide by atomic absorption method; S3 separates the natural copper in the filter residue B obtained in the step S2, and adopts atomic absorption method to measure the content of natural copper; S4 separates the copper sulfide in the filter residue C obtained in the step S3, adopts a titration method to measure the content of copper sulfide; wherein, the The step of separating copper sulfide in the step S4 includes: first heating and dissolving filter residue C with dilute nitric acid, then adding dilute sulfuric acid to continue heating and decomposing, then evaporating the solution to dryness, adding dilute sulfuric acid to heat and dissolve to obtain a mixture of copper and iron, and then masking Iron and the titration method was used to determine the content of copper sulfide. Adopting the method of the invention avoids the use of highly toxic liquid bromine, and the determination process is safer.

Description

technical field [0001] The invention belongs to the field of chemical analysis, and more particularly relates to a chemical analysis method of copper phase in copper concentrate. Background technique [0002] Copper is an important strategic resource, with an average content of 1 × 10 in the earth's crust -2 %, copper is a typical sulphurophile element, and its primary minerals are almost all sulfides, which can form single various types of hydrothermal deposits and skarn deposits, and can also form magmatic differentiation copper-nickel together with nickel and cobalt type or cobalt-copper type deposits, and can also form copper-bearing polymetallic deposits with lead and zinc. About 200 kinds of copper minerals have been found in nature, and there are more than a dozen common copper minerals. The main copper minerals are chalcopyrite, bornite, chalcocite, chalcocite, copper blue, tetrahedrite, tetrahedrite, chalcolithite, malachite, azurite, cuprite, black copper ore, si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N31/16G01N21/79G01N21/33G01N23/207G01N23/223
CPCG01N31/162G01N21/79G01N21/33G01N23/207G01N23/223
Inventor 赵伟郑建明封亚辉侯建军丁友超
Owner 南京海关工业产品检测中心
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