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Preparation method of pyrite with different oxidation degrees

An oxidation degree, pyrite technology, applied in solid separation, flotation and other directions, can solve the problems of long preparation period, affecting the oxidation degree, slow oxidation rate of pure pyrite, etc., to achieve strong environmental adaptability, efficient and stable oxidation , the effect of shortening the preparation cycle

Active Publication Date: 2022-04-15
INST OF PROCESS ENG CHINESE ACAD OF SCI
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Problems solved by technology

The oxidation rate of pyrite depends on the slurry potential, oxidant type, dosage and other factors. The oxidation rate of pure pyrite in aqueous solution is relatively slow. There are usually two methods to simulate the oxidation process in the traditional flotation or geological research process: 1. Long-term air exposure is used to simulate the oxidation process on the pyrite surface, but this kind of sample preparation period is long, greatly affected by the environment, and the repeatability rate is almost 0. [5] ; 2. Use oxidants with higher oxidation performance such as calcium hypochlorite, calcium peroxide and other oxidants, but CaOH will be produced during its action + , CaSO 4 Species that reduce the floatability of pyrite, etc., seriously affect the judgment of the degree of oxidation on the flotation results [6]
[0005] The traditional pyrite oxidation method takes a long time, causes great pollution, and has low repeatability. The possibility of producing pyrite samples with different oxidation degrees is almost zero. This situation seriously affects the effect of pyrite oxidation degree on flotation research. conduct

Method used

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  • Preparation method of pyrite with different oxidation degrees

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Embodiment 1

[0031] The present embodiment provides a kind of preparation method of different oxidation degree pyrite, concrete process is:

[0032] S1, the pyrite is crushed to a particle size≤2mm, then the 100g crushed sample is taken, mixed with 50ml of water and placed in a ball mill (the ball mill medium is a high chromium ball with a chromium content of 30%, and the filling rate is 32%. 47 large, medium and small balls each), grinding for 5 minutes. A pyrite powder sample with a particle size of P90≤110 μm was obtained.

[0033] S2. Collect the pyrite powder after grinding, place it in a high-speed stirrer, ensure that the solution volume is 500ml, maintain the stirrer speed at 2000r / min, feed the air at a rate of 50L / h, and continuously add a mass fraction of 30%. Hydrogen peroxide, the dosage is 1ml / min.

[0034] During the oxidation process, high-purity sodium hydroxide was used to maintain the pH of the solution system at 9, and the solution potential was maintained at 380mv (v...

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Abstract

The invention discloses a preparation method of pyrite with different oxidation degrees. According to the preparation method, high-efficiency oxidation of a sample is realized by adjusting various parameters of equipment and medicaments in the oxidation process; the direct proportion relation between the sample oxidation degree and time is guaranteed by monitoring the potential in the oxidation process, the content of the released total sulfur ions and the flotation recovery rate, the method is high in repeatability and low in requirement for environment equipment, the prepared sample is clean and free of pollution, the accuracy of univariate research is guaranteed, and the working research efficiency is greatly improved.

Description

technical field [0001] The invention relates to the field of mineral processing engineering, in particular to a preparation method of pyrite with different oxidation degrees. Background technique [0002] Pyrite (FeS 2 ) is the most widely distributed sulfide in the crust, with pyrite (FeS 2 ) as the carrier of gold mines accounted for more than 85% of gold mine resources; the latest survey shows that refractory gold mines accounted for 38% of the total gold mine resources [1] , and showed an increasing trend year by year. With dolomite (CaMg(CO 3 ) 2 ) is the key to limit the flotation recovery of gold ore. It is characterized in that the pyrite is distributed in disseminated fine particles, easy to oxidize, and different oxidation degrees have great influence on the adsorption of flotation reagents and solution ions. Covers have a noticeable effect. Flotation is a chemical reaction process carried out in an aqueous solution environment. The degree of oxidation of pyr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03D1/012B03D101/02B03D103/02
CPCB03D1/012B03D2201/02B03D2203/02Y02P10/20
Inventor 阮仁满赵海平牛晓鹏董丙旭贾先兵
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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