CN102331361A - Pretreatment method for testing micro-granular gold ore containing organic carbon through atomic absorption spectrometry - Google Patents
Pretreatment method for testing micro-granular gold ore containing organic carbon through atomic absorption spectrometry Download PDFInfo
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Abstract
The invention discloses a pretreatment method for testing micro-granular gold ore containing organic carbon through atomic absorption spectrometry, which comprises the following steps of: firstly, performing selective ore dissolution to fully dissolve quartz, aluminosilicate mineral and sulfide mineral in an ore sample so as to dissociate micro-granular included gold and organic carbon; then, removing the organic carbon in the dissolved residue through roasting oxidation, and testing the gold content of the pretreated sample through the operations of the ordinary atomic absorption spectrometry. Because interfering materials are eliminated and the micro-granular gold ore containing organic carbon is tested by combining the pretreatment method and the ordinary atomic absorption spectrometry, the invention has the advantages of short flow, simple and convenient operation, quick result reporting, low cost and accurate testing result, and the problems of the traditional two methods of atomic absorption spectrometry and fire assaying are solved.
Description
Technical field
The invention belongs to the chemical analysis field of gold mine, especially a kind of atomic absorption spectrography (AAS) chemical examination contains the preprocess method of the microfine gold mine of organic charcoal.
Background technology
Atomic absorption spectrography (AAS) is one of main method of gold content in the chemical examination ore, its major advantage be flow process short, simple to operation, quote that the result is fast, expense is low, thereby become the important method of gold content in the current chemical examination ore.Yet for the microfine type gold ore that contains organic charcoal, because the gold mineral granularity is superfine, even behind grind away, the part gold still is wrapped in and is difficult in the carrier mineral leach; Organic carbonaceous thing in the ore and shale mineral weave in addition, it is clean to be difficult to roasting, and in leaching process, residual organic carbonaceous thing can partly adsorb the gold in the leachate, thereby causes the serious distortion of result of laboratory test of atomic absorption spectrography (AAS).The effective means that addresses the above problem at present is to adopt fiery ensaying method to chemically examine, and its advantage is that result of laboratory test is accurate, but still has long flow path, trivial operations, quotes defectives such as the result is slow, expense height.
Summary of the invention
The technical matters that the present invention will solve provides the preprocess method that the chemical examination of a kind of simply and effectively atomic absorption spectrography (AAS) contains the microfine gold mine of organic charcoal, to improve the accuracy of atomic absorption spectrography (AAS).
Adopt following technical scheme for solving the problems of the technologies described above: the atomic absorption spectrography (AAS) chemical examination contains the preprocess method of the microfine gold mine of organic charcoal, may further comprise the steps:
< 1>adding hydrofluoric acid solution in the testing sample makes it fully dissolve wherein quartz and aluminum silicate mineral;
< 2>filter residual hydrofluorite in the also clean filter residue of the sample that step < 1>is handled;
< 3>salpeter solution that adds mass percentage concentration 5%～50% in step < 2>filter residue makes it fully dissolve sulfide-based mineral wherein;
< 4>filter residual nitric acid in the also clean filter residue of the sample that step < 3>is handled;
< 5>filter residue that will handle through step < 4>is in 600～700 ℃ of roasting 1～3h, makes wherein organic carbonaceous thing and the residual abundant oxidation of sulfide.
The testing sample of step < 1>places the tetrafluoroethene beaker.
The filtration of step < 2>adopts plastic funnel to carry out.
Being dissolved in the glass beaker of step < 3>carried out.
The roasting of step < 5>is carried out in crucible, porcelain boat or ceramic evaporation ware.
Contain the problem that the atomic absorption spectrography (AAS) of the microfine gold mine of organic charcoal exists to chemical examination; The invention provides a kind of preprocess method: at first carry out selectivity and dissolve the ore deposit; Quartz in the ore sample and aluminum silicate mineral and sulfide-based mineral are fully dissolved, make microfine parcel gold and organic carbonaceous thing dissociate out; Then, through roasting oxidation, remove the organic carbonaceous thing in the dissolution residual substance.Get final product by conventional atomic absorption spectrography (AAS) operation chemical examination gold content again through pretreated sample.Owing to got rid of interfering material; Chemically examine the microfine type gold ore that contains organic charcoal in conjunction with the present invention and conventional atomic absorption spectrography (AAS); Flow process is short, simple to operation, quote that the result is fast, expense is low and result of laboratory test is accurate, overcome two kinds of problems that method faced of traditional atomic absorption spectrum and fiery ensaying.
Embodiment
Following examples select for use the microfine type gold mine that contains organic charcoal of Guangxi Zhang Jiawan gold mine to make an experiment, and its organic carbon content reaches 1.23%, and the gold mineral particle diameter is many less than 5 μ.
Embodiment 1
< 1>sample (numbering ZK9801-H22) is dried to constant weight; Take by weighing 10 grams; Testing sample after weighing is placed the polytetrafluoroethylene (PTFE) beaker; Add hydrofluoric acid solution in the testing sample and make it fully dissolve wherein quartz and aluminum silicate mineral, the gold mineral of order parcel and dissociate out with organic carbonaceous thing that the shale thing interweaves;
< 2>adopt plastic funnel to filter and also clean residual hydrofluorite in the filter residue through the sample that step < 1>is handled;
< 3>step < 2>filter residue is changed in the glass beaker together with filter paper, make it fully dissolve sulfide-based mineral wherein toward the salpeter solution that wherein adds mass percentage concentration 10%, the gold mineral of order parcel dissociates out;
< 4>filter residual nitric acid in the also clean filter residue of the sample that step < 3>is handled;
< 5>will change in the crucible together with filter paper through the filter residue that step < 4>is handled,, make wherein organic carbonaceous thing and the residual abundant oxidation of sulfide in 670 ℃ of roasting 2h.
Then, operate the gold content of sample for test by conventional atomic absorption spectrography (AAS).
Embodiment 2
Other conditions are with embodiment 1, sample (numbering ZK9801-H23), salpeter solution mass percentage concentration 5%, 600 ℃ of roasting 3h in crucible.
Embodiment 3
Other conditions are with embodiment 1, sample (numbering ZK9801-H25), salpeter solution mass percentage concentration 25%, 630 ℃ of roasting 2h in porcelain boat.
Embodiment 4
Other conditions are with embodiment 1, sample (numbering ZK9801-H26), salpeter solution mass percentage concentration 50%, 700 ℃ of roasting 1h in crucible.
Embodiment 5
Other conditions are with embodiment 1, sample (numbering ZK9801-H32), salpeter solution mass percentage concentration 35%, 700 ℃ of roasting 3h in the ceramic evaporation ware.
Embodiment 6
Other conditions are with embodiment 1, sample (numbering ZK9804-H34), salpeter solution mass percentage concentration 40%, 650 ℃ of roasting 2h in crucible.
For ease of relatively, adopt traditional atomic absorption spectrography (AAS) (traditional method) and fire assaying (pyrogenic process) to compare simultaneously to test and be benchmark, result such as table 1 with the result of laboratory test of fire assaying:
Three kinds of method gold contents of table 1 result
| Sample number into spectrum | Pyrogenic process | The tradition method | Embodiment |
| ZK9801-H22 | 11.9 | 9.74 | 11.46 |
| ZK9801-H23 | 8.15 | 7.61 | 8.93 |
| ZK9801-H25 | 6.40 | 5.36 | 6.27 |
| ZK9801-H26 | 5.0 | 4.35 | 5.08 |
| ZK9801-H32 | 3.65 | 2.87 | 3.34 |
| ZK9804-H34 | 3.55 | 3.00 | 3.49 |
Visible from table 1, the result of laboratory test of using atomic absorption spectrography (AAS) of the present invention and fire assaying is identical basically, and traditional atomic absorption spectrography (AAS) then deviation is bigger, especially sample ZK9801-H22,25,32 and 34.
Claims (5)
1. atomic absorption spectrography (AAS) chemical examination contains the preprocess method of the microfine gold mine of organic charcoal, it is characterized in that this method may further comprise the steps:
< 1>adding hydrofluoric acid solution in the testing sample makes it fully dissolve wherein quartz and aluminum silicate mineral;
< 2>filter residual hydrofluorite in the also clean filter residue of the sample that step < 1>is handled;
< 3>salpeter solution that adds mass percentage concentration 5%～50% in step < 2>filter residue makes it fully dissolve sulfide-based mineral wherein;
< 4>filter residual nitric acid in the also clean filter residue of the sample that step < 3>is handled;
< 5>filter residue that will handle through step < 4>is in 600～700 ℃ of roasting 1～3h, makes wherein organic carbonaceous thing and the residual abundant oxidation of sulfide.
2. atomic absorption spectrography (AAS) chemical examination according to claim 1 contains the preprocess method of the microfine gold mine of organic charcoal, and it is characterized in that: the said testing sample of step < 1>places the tetrafluoroethene beaker.
3. atomic absorption spectrography (AAS) chemical examination according to claim 2 contains the preprocess method of the microfine gold mine of organic charcoal, it is characterized in that: the said filtration of step < 2>adopts plastic funnel to carry out.
4. atomic absorption spectrography (AAS) chemical examination according to claim 3 contains the preprocess method of the microfine gold mine of organic charcoal, and it is characterized in that: said being dissolved in the glass beaker of step < 3>carried out.
5. atomic absorption spectrography (AAS) chemical examination according to claim 4 contains the preprocess method of the microfine gold mine of organic charcoal, and it is characterized in that: the said roasting of step < 5>is carried out in crucible, porcelain boat or ceramic evaporation ware.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103575668A (en) * | 2012-08-02 | 2014-02-12 | 湖南东港锑品有限公司 | Method for measuring gold content in carbon-containing ore by using spectrophotometry |
Citations (1)
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| CN101419174A (en) * | 2007-10-24 | 2009-04-29 | 中国科学院沈阳应用生态研究所 | Method for detecting whole copper in soil |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101419174A (en) * | 2007-10-24 | 2009-04-29 | 中国科学院沈阳应用生态研究所 | Method for detecting whole copper in soil |
Non-Patent Citations (3)
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| 张秀丽: "影响活性炭吸附原子吸收光谱法测定金的因素", 《新疆有色金属》 * |
| 杨彦杰 等: "原子吸收光谱法测定矿石中金的探讨", 《延边大学学报（自然科学版）》 * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103575668A (en) * | 2012-08-02 | 2014-02-12 | 湖南东港锑品有限公司 | Method for measuring gold content in carbon-containing ore by using spectrophotometry |
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