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Quantitative analysis method of heavy metal complexed xanthate radicals

A technique for quantitative analysis and xanthic acid, applied in the measurement of color/spectral characteristics, etc., to achieve the effects of accurate results, convenient promotion, and simple analysis procedures

Inactive Publication Date: 2014-08-13
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is still a lack of direct and effective quantitative analysis methods for the speciation of heavy metal complexes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1 Analysis of xanthate in the form of heavy metal complexes in galena concentrate obtained from flotation in a concentrator

[0016] Analysis steps include:

[0017] 1. Measure the absorbance of 0.1, 0.3, 0.5, 1.0, 2.0, 3.0 mg / L aqueous solution of xanthate at 301 nm with a UV-Vis spectrophotometer to obtain the ratio of the absorbance of free xanthate to its mass concentration k is 0.239 L / mg;

[0018] 2. Vacuum dry the galenite concentrate sample at room temperature to remove the moisture contained in it;

[0019] 3. Weigh the dried galena concentrate sample with mass m=0.50 g and place it in a 50 mL centrifuge tube, add 20 mL deionized water, shake and centrifuge, remove the supernatant, repeat 4 times to wash away Free xanthate in the sample;

[0020] 4. Add 5 mL of n-hexane to the above centrifuge tube, shake and centrifuge, remove the supernatant, repeat this step 3 times to wash away the oxidation products of xanthate such as dixanthate in the sample;...

Embodiment 2

[0023] Example 2 Analysis of xanthate in the form of heavy metal complexes in the waste residue discharged from a concentrator

[0024] Analysis steps include:

[0025] 1. Measure the absorbance of 0.1, 0.3, 0.5, 1.0, 2.0, 3.0 mg / L aqueous solution of xanthate at 301 nm with a UV-Vis spectrophotometer to obtain the ratio of the absorbance of free xanthate to its mass concentration k is 0.242 L / mg;

[0026] 2. Vacuum dry the waste residue sample at room temperature to remove the moisture contained in it;

[0027] 3. Weigh the dried waste residue sample with a mass of m=2.0 g and place it in a 50 mL centrifuge tube, add 30 mL of deionized water, shake and centrifuge, remove the supernatant, repeat 3 times to wash away the free state in the sample xanthate;

[0028] 4. Add 10 mL of n-hexane to the above centrifuge tube, shake and centrifuge, remove the supernatant, repeat this step 3 times to wash away the oxidation products of xanthate such as dixanthate in the sample;

[...

Embodiment 3

[0031] Example 3 Analysis of xanthate in the form of heavy metal complexes in the tailings slag of a concentrator

[0032] Analysis steps include:

[0033] 1. Measure the absorbance of 0.1, 0.3, 0.5, 1.0, 2.0, 3.0 mg / L aqueous solution of xanthate at 301 nm with a UV-Vis spectrophotometer to obtain the ratio of the absorbance of free xanthate to its mass concentration k is 0.241 L / mg;

[0034] 2. Vacuum dry the tailings slag samples at room temperature to remove the moisture contained in them;

[0035] 3. Weigh the dried waste residue sample with a mass of m=5.0 g and place it in a 50 mL centrifuge tube, add 30 mL of deionized water, shake and centrifuge, remove the supernatant, repeat 2 times to wash away the free state in the sample xanthate;

[0036] 4. Add 15 mL of n-hexane to the above centrifuge tube, shake and centrifuge, remove the supernatant, repeat this step 3 times to wash away the oxidation products of xanthate such as dixanthate in the sample;

[0037] 5. A...

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Abstract

The invention relates to a quantitative analysis method of heavy metal complexed xanthate radicals. An ultraviolet-visible spectrophotometer is adopted to measure the absorbancy of xanthate radical aqueous solution in different concentrations at the position of 301nm, so as to obtain the specific value k of the absorbancy and the mass concentration of the free-state xanthate radicals; the sample is subjected to vacuum drying at normal temperature to remove moisture; m g of dried samples are weighed and are placed in a centrifuge tube, then deionized water is added for oscillation and centrifugation, then normal hexane is added for oscillation and centrifugation, deionized water and sodium sulphide are added, the mixture is mixed uniformly and filtered, filtrate is collected, the free-state xanthate radicals adsorbed on filter residues are washed by deionized water, the absorbancy of the filtrate at the position of 301nm is measured by the ultraviolet-visible spectrophotometer, and finally, the mass fraction of the heavy metal complexed xanthate radicals is calculated. The measurement result is accurate, the relative standard deviation in the analysis of a practical sample is less than 10% and the recovery rate is higher than 80%.

Description

technical field [0001] The invention relates to a quantitative analysis method for xanthate in the form of heavy metal complexes. Background technique [0002] The alkali metal salt of xanthate is commonly known as xanthate, which is the largest and most widely used collector in the mineral processing industry, and xanthate root is the active ingredient. During the flotation process, free xanthate radicals will combine with copper, lead, nickel, cadmium and other heavy metal ions to form complexes that are insoluble in water, most of which are adsorbed on the surface of the target minerals, and a small part enters the tailings pond with the beneficiation wastewater . The adsorption of xanthate on the mineral surface is the key factor determining the success of flotation, so the analysis of xanthate in the form of heavy metal complexes can help mineral processing enterprises monitor the utilization efficiency of xanthate in the flotation process. In addition, xanthate is hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33
Inventor 邱波刘金凤杨兆光李海普
Owner CENT SOUTH UNIV
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