Nickel sulfide minerals and silicate minerals separation of nickel sulfide minerals (including mineral arsenic compound), and includes a silicate mineral consisting of a series of complex minerals, therefore, realize the quantitative separation of these two minerals is very difficult. According to different situations, the following separation methods are used: (1) Bromine solution method. The method is based on the oxidation of nickel sulfide minerals to sulphate minerals by bromine, and silicate minerals and bromine do not. The bromine solution separating the nickel sulfide minerals is a saturated bromine water-methanol solution. Oxidation leaching at room temperature for 1-2h, all nickel sulfide minerals are dissolved in saturated bromine water, silicate minerals are basically insoluble, which is the most simple and easy method for separating nickel sulfide minerals. Notably, nickel pyrite was dissolved in a saturated bromine slower, and therefore, when the high content of pentlandite, leaching time should be extended. Secondly, the determination result of the nickel sulfide mineral is too high. Therefore, separation of nickel sulfide minerals with saturated bromine water is only applicable to sulfide ore. In order to reduce the leaching rate of silicate minerals in saturated bromine water, a small amount of calcite can be used to obtain good results. When analyzing the tester with higher sulfur content, elemental sulfur is precipitated during the leaching process, and the undissolved ore particles are wrapped, resulting in incomplete leaching. At this time, a bromine-carbon tetrachloride solution may be used instead of the saturated bromine water. The effect of separating the sulfided material by the bromine-methanol solution is better than that of the saturated bromine water, and is generally oscillated by shaking at room temperature. When the content of the nickel yellow iron mineral is high, it can be leached and refluxed in a water bath of 60 ° C. Some researchers have proposed to soak the easily soluble silicate with 20g/L NH4HF2 solution, 100g/L tartaric acid solution, 50g/L NH4Cl solution, concentrated (NH4)2S solution, etc. for the solubility of silicate minerals. The nickel sulfide mineral is then leached with saturated bromine water and the poorly soluble silicate mineral is determined in the residue. (2) H2O2 method. H2O2 oxidizes sulfide minerals to nickel sulfate, while silicate minerals do not. However, since the iron hydroxide (the product of oxidation of iron-containing sulfides such as pyrite) generated during the reaction not only adsorbs nickel ions but also covers the surface of the nickel sulfide mineral, preventing the nickel sulfide mineral from continuing to dissolve, it is usually Treated with 100 g/L ammonium citrate solution. The disadvantage is that it needs to be treated several times repeatedly, and the nickel sulfide mineral can be fully leached, which increases the operation difficulty, and the silicate mineral has a considerable amount of dissolution in the ammonium citrate solution. (3) HF method. In order to avoid the influence of the dissolution of silicate minerals on the separation of nickel sulfide minerals, silicate minerals are generally leached by dilute H2SO4 and HF solutions containing CuSO4, and Cu2+ forms a copper sulfide film on the surface of nickel sulfide minerals to protect nickel sulfide minerals. Under the specified conditions, all silicate minerals are leached and the nickel sulphide mineral leaching rate is 5%-10%. This method is only applicable to oxidized ore containing less nickel sulphide minerals. The advantage is that it is simple and fast. Suitable for all types of samples. If the measurement results are corrected by the nickel sulphide mineral leaching rate, more accurate analytical data can be obtained. (4) Chlorination roasting method. The sample 5gNH4Cl was mixed and placed in a porcelain crucible, wetted with a small amount of water, stirred, and calcined at 300-350 ° C for 1.5-2 h. After cooling, it was leached with hot water, and the nickel sulfide mineral was determined in the filtrate, and silicon was determined in the residue. Acid minerals.
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