A kind of chlorine dioxide pre-oxidation method of sulfur-containing gold ore

A chlorine dioxide and pre-oxidation technology, applied in the direction of improving process efficiency, can solve problems such as no literature reports, and achieve the effects of good ore adaptability, saving gold leaching agent consumption, and excellent environmental performance.

Active Publication Date: 2020-03-31
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The United States, Canada, Japan, Western Europe, etc. have approved and recommended chlorine dioxide for disinfection, deodorization, mildew prevention, and food preservation and preservation of food, food processing industry, pharmaceutical industry, hospital, public environment, etc., while chlorine dioxide As a safe and efficient oxidant, it is used in the oxidation pretreatment of mineral products under normal temperature and pressure conditions, and has not been reported in the literature.

Method used

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  • A kind of chlorine dioxide pre-oxidation method of sulfur-containing gold ore

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Experimental program
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Effect test

Embodiment 1

[0032] In this embodiment, the method of the present invention is used to oxidize single minerals such as stibnite, pyrite or arsenopyrite. Finely grind the above three kinds of single minerals to -0.074mm, adjust the slurry according to the liquid-solid mass ratio of 200:1, do not add acidity regulator, and pre-oxidize at 50°C for 1 hour. The chlorine dioxide generator uses sodium chlorite, and the activator uses tartaric acid, and the mass ratio of the two is 5:2. Under the optimal conditions of the mass ratios of sodium chlorite to stibnite, pyrite and arsenopyrite being 7:1, 15:4 and 7:2, respectively, the sulfur removal rates of the three sulfide ores were all the same. Reach more than 95%.

Embodiment 2

[0034] In this embodiment, the ore sample used is a Carlin-type gold mine in Gansu. In this type of gold ore, metal sulfides mainly composed of pyrite, stibnite, and arsenopyrite are scattered in the ore, and gold is usually wrapped in sulfide minerals in the form of fine particles or submicroscopic particles, which is difficult to obtain. Process ore. The results of its chemical composition analysis are shown in Table 1.

[0035] Table 1 raw ore multi-element analysis results (%, * gram / ton)

[0036] Au* Ag* Cu Pb Zn Fe C S Sb As SiO 2

al 2 o 3

CaO MgO TiO 2

4.09 1.1 0.005 0.004 0.014 3.30 2.07 0.85 0.46 0.39 56.11 14.33 5.51 2.83 0.55

[0037] Such as figure 1 As shown, chlorine dioxide generator (sodium chlorite NaClO 2 , concentration 0.12mol L-1) and activator (citric acid C 6 h 8 o 7, concentration 0.032mol L-1), the mass ratio of the two substances is 15:4, after the generated chlorine dioxid...

Embodiment 3

[0040] The difference from Example 2 is that the ore sample used in this example is the flotation closed-circuit gold ore of the gold ore used in Example 2. After flotation, the content of gold, silver, arsenic, iron, antimony, sulfur and other elements in the minerals increased, and the content of gangue minerals decreased accordingly. The chemical composition analysis results are shown in Table 2.

[0041] Table 2 flotation concentrate multi-element analysis results (%, * gram / ton)

[0042] Au* Ag* As Sb Fe C S SiO 2

al 2 o 3

CaO MgO TiO 2

56.8 8.1 5.69 3.29 15.07 1.35 17.3 34.37 14.87 3.63 2.26 0.44

[0043] Slurry the flotation concentrate according to the liquid-solid mass ratio of 50:1, adjust the acidity to pH=4 with sulfuric acid, and pre-oxidize at 50°C for 1 hour. The chlorine dioxide generator uses sodium chlorite, and the activator uses citric acid, and the mass ratio of the two is 15:4. Under the bes...

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Abstract

The invention belongs to the technical field of gold ore mineral processing, and in particular, relates to a chlorine dioxide preoxidation method of sulfur-contained gold ores. Chlorine dioxide is used as an oxidizing agent for redox reaction with such sulfides as stibnite, pyrite, arsenopyrite, galena, blende and chalcopyrite in refractory gold ores, so that gold surrounded by the sulfides is released, the contact probability of gold with gold leaching medicament is increased, the gold recovery rate in subsequent leaching flow is increased, and the consumption of the gold leaching medicamentis reduced. The used oxidizing agent-chlorine dioxide is safe and nontoxic, and has higher environmental protection advantage. Chlorine dioxide is prepared by direct reaction of binary solid medicament in pulp, is prepared when being needed, is not needed to store, and is high in conversion efficiency. The method is performed under the conditions of low temperature, normal pressure and no need ofcontrolling acidity; reaction conditions are mild; and requirements on a reaction container are low. In conclusion, the method is a new method for metal sulfide ore wet oxidation pretreatment with environmental protection, high efficiency and prominent economical benefit.

Description

technical field [0001] The invention belongs to the technical field of gold ore mineral processing, and in particular relates to a chlorine dioxide chemical oxidation pretreatment method for sulfur-containing gold ore. Background technique [0002] With the development of economy and society, the demand for gold in the market has increased significantly, consuming a large amount of gold ore resources, high-grade, easy-to-select gold ore resources are increasingly exhausted, and refractory gold ore has become an important source of gold supply. However, the gold in refractory gold ores is mostly wrapped in fine particles in associated minerals and gangue minerals, which cannot be in direct contact with leachate and dissolved oxygen, resulting in partial gold that cannot be directly leached and extracted. The associated sulfide minerals in gold minerals will consume a large amount of leaching agents during the gold leaching process, which seriously affects the gold extraction ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/04C22B11/06
CPCC22B3/04C22B11/06Y02P10/20
Inventor 董再蒸朱一民高鹏韩跃新王楠
Owner NORTHEASTERN UNIV LIAONING
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