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Method for determining lead content in multi-metal ore

A determination method and technology of lead content, applied in chemical analysis by titration, preparation of test samples, measurement of color/spectral characteristics, etc., can solve problems such as low results, element interference, measurement interference, etc., to improve accuracy , eliminate interference, and analyze the effect of accurate results

Inactive Publication Date: 2018-08-24
CHANGCHUN GOLD RES INST
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0002] Lead content plays an important role in mineral trading and non-ferrous smelting. Therefore, it is of great significance to accurately analyze the lead content in ores. With the continuous mining of mineral resources in our country, there are fewer and fewer single minerals, and more and more associated ores. If there are many, the element interference will become more and more serious in the process of ore analysis, which will bring great challenges to the analysis of lead content in ore
[0003] At present, the determination of lead in ores mostly adopts the EDTA volumetric method. However, the presence of elements such as silicon, carbon, arsenic, antimony, tin, bismuth, copper, iron, and zinc in ores will interfere with the determination, and lead sulfate in the filtrate The dissolution will make the result low, so it is imperative to seek an accurate method for the determination of lead content in complex polymetallic ores

Method used

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  • Method for determining lead content in multi-metal ore
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  • Method for determining lead content in multi-metal ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] The content of bismuth in the sample ore needs to be determined before the experiment.

[0065] A kind of assay method of lead content in polymetallic ore, concrete operation steps are as follows:

[0066] Step 1: Weigh 0.3003g ore sample, put it in a 400ml beaker, add water to moisten it, add 0.5g of ammonium fluoride solid, then add 15-20ml of saturated nitric acid-potassium chlorate solution, cover with a watch glass, and heat on a hot plate until sample dissolution;

[0067] Step 2, take off the beaker to cool, rinse the watch glass and the wall of the cup with water, add 10ml (1+1) sulfuric acid, heat to emit thick white smoke for 2 minutes, take it off to cool, then add 10mL hydrobromic acid (ρ20 , 1.50g / mL), heat again until thick white smoke is emitted, and then cool down. After adding (1+1) sulfuric acid, the smoking time should not be too long, otherwise iron and aluminum will form insoluble matter and be mixed in the lead sulfate precipitation to affect the ...

Embodiment 2

[0084] The content of bismuth in the sample ore needs to be determined before the experiment.

[0085] A kind of assay method of lead content in polymetallic ore, concrete operation steps are as follows:

[0086] Step 1: Weigh 0.5000g of ore sample, place it in a 400ml beaker, add water to moisten it, add 0.5g of ammonium fluoride solid, then add 15-20ml of saturated nitric acid-potassium chlorate solution, cover with a watch glass, and heat on a heating plate until sample dissolution;

[0087] Step 2, take off the beaker to cool, rinse the watch glass and the wall of the cup with water, add 10ml (1+1) sulfuric acid, heat to emit thick white smoke for 2 minutes, take it off to cool, then add 10mL hydrobromic acid (ρ20 , 1.50g / mL), heated again until thick white smoke was emitted, and then cooled;

[0088] Step 3: Wash the watch glass and cup wall after purging in Step 2 with water, add the washing solution into the beaker in Step 2, add water to make it volume 100ml, heat to...

Embodiment 3

[0104] The content of bismuth in the sample ore needs to be determined before the experiment.

[0105] A kind of assay method of lead content in polymetallic ore, concrete operation steps are as follows:

[0106] Step 1: Weigh 0.2000g of ore sample, place it in a 400ml beaker, add water to moisten it, add 0.5g of ammonium fluoride solid, then add 15-20ml of saturated nitric acid-potassium chlorate solution, cover with a watch glass, and heat to The sample is dissolved. The high carbon content in the sample leads to incomplete dissolution of the sample. Remove and add potassium chlorate solid, and continue heating until the sample is completely dissolved;

[0107] Step 2, take off the beaker to cool, rinse the watch glass and the wall of the cup with water, add 10ml (1+1) sulfuric acid, heat to emit thick white smoke for 2 minutes, take it off to cool, then add 10mL hydrobromic acid (ρ20 , 1.50g / mL), heated again until thick white smoke was emitted, and then cooled;

[0108] ...

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Abstract

The invention belongs to the technical field of methods for determining lead content in ore and in particular relates to a method for determining lead content in multi-metal ore. The method comprisesthe following steps: removing silicon with ammonium fluoride, dissolving a sample with a saturated nitrate-potassium chlorate solution, precipitating lead with sulfuric acid, eliminating arsenic, antimony and tin with hydrobromic acid, filtering to separate lead sulfate from partial interfering ions of copper, iron and zinc, dissolving the precipitate with an acetic acid-sodium acetate buffer solution, titrating with an EDTA (Ethylene Diamine Tetraacetic Acid) standard solution, concentrating the filtrate, determining the lead content in an acidic medium by using an atomic absorption spectrometer, adding results obtained during EDTA titration and atomic absorption spectrometry to obtain the total content of lead in the ore. Aiming at determination of the lead content in the multi-metal ore, interference can be effectively eliminated, lead content loss is avoided, and the experimental accuracy is improved.

Description

technical field [0001] The invention belongs to the technical field of determination methods for lead content in ores, and in particular relates to a determination method for lead content in polymetallic ores. Background technique [0002] Lead content plays an important role in mineral trading and non-ferrous smelting. Therefore, it is of great significance to accurately analyze the lead content in ores. With the continuous mining of mineral resources in our country, there are fewer and fewer single minerals, and more and more associated ores. If there are many, the element interference will become more and more serious in the process of ore analysis, which will bring great challenges to the analysis of lead content in ore. [0003] At present, the determination of lead in ores mostly adopts the EDTA volumetric method. However, the presence of elements such as silicon, carbon, arsenic, antimony, tin, bismuth, copper, iron, and zinc in ores will interfere with the determinat...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N31/16G01N1/28G01N1/44G01N1/42G01N1/34
CPCG01N1/28G01N1/34G01N1/42G01N1/44G01N21/31G01N31/16
Inventor 赵亚明穆岩洪博陈永红郭嘉鹏葛仲义
Owner CHANGCHUN GOLD RES INST
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