Tungsten tin mineral beneficiation method

Abstract

The invention discloses a tungsten tin mineral beneficiation method; and tungsten tin minerals are tungsten tin fed ores as sulfide ores flotation tailings obtained after grinding of multimetal ores of tungsten associated cassiterite, removal of magnetite by magnetic separation and removal of sulfur concentrates by sulfide ore flotation. Mixed liquid of sodium carbonate and sodium hydroxide, sodium fluosilicate, sodium hexametaphosphate and lead nitrate are added in the tungsten tin fed ores for pulping; then, collecting agents-benzohydroxamic acid, hydroxamic acid and emulsified oleic acid are added for tungsten tin mixed flotation; and tungsten tin mixed concentrates with WO3 of not less than 20% and Sn of not less than 1% are obtained by 2 times of roughing, 3-4 times of selection and 2-3 times of scavenging. The method has the following characteristics: the beneficiation method of tungsten tin mixed flotation is used for the tungsten tin fed ores; and when tungsten minerals are recovered by floatation, tin minerals are enriched in tungsten concentrates to achieve the purpose of synchronously recovering the tin minerals. The method is simple in recovery process flow, stable in beneficiation process and suitable for beneficiation of the tungsten tin fed ores with WO3 of 0.2-0.5%, Sn of not more than 0.2%, CaF2 of not more than 25%, CaCO3 of not more than 10% and the black andwhite tungsten ratio of 2: 8-8: 2.

Description

technical field [0001] The present invention relates to the field of comprehensive recovery of mineral resources, in particular to a tungsten-tin feed with WO3 0.2-0.5%, Sn≤0.2%, CaF2≤25%, CaCO3≤10%, black and white tungsten ratio 2:8-8:2 mining method. Background technique [0002] Tungsten minerals mainly include scheelite and wolframite. Scheelite is generally recovered by flotation, and wolframite is mainly recovered by gravity separation, magnetic separation, and flotation. In polymetallic ores with low-grade tin associated with tungsten, the value of cassiterite is higher than that of tungsten minerals, but the grade of associated cassiterite is lower, and the total value of tungsten minerals is often higher than that of cassiterite. The beneficiation method is to recover tungsten minerals first and recover cassiterite in the tailings. [0003] There are more than 20 kinds of tin-containing minerals, among which only the oxide cassiterite has industrial value, so the...

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Problems solved by technology

Although benzohydroxamic acid has a certain ability to collect cassiterite, since water glass or a combination regulator mainly composed of water glass is added to black and white tungsten mixed flotation to inhibit silicate minerals and Calcite minerals, and sodium silicate has a strong inhibitory effect on cassiterite. When black and white tungsten mixed flotation method is used to carry out black and white tungsten mixed flotation on polymetallic ores with low-grade fine-grained cassiterite associated with tungsten, black and white tungsten is obtained. The WO3 grade in the mixed concentrate is >20%, but the Sn grade is only 0.2%~0.5%, and the tin recovery rate is <8%. Therefore, the conventional black and white tungsten mixed flotation beneficiation method cannot be realized at the same time as the black and white tungsten mixed flotation. The effective recovery of cassiterite can only recover the associated low-grade cassiterite in the black and white tungsten mixed flotation tailings by gravity separation or flotation

[0005] In the polymetallic ore with low-grade fine-grained cassiterite associated with tungsten, due to the low content of cassiterite (the tin grade is less than 0.2% of the cut-off grade of the associated tin ore in industrial mining), the particle size is fine (in the -0.043mm particle size, the cassiterite Occupancy rate greater than 60%), if the cassiterite in the tungsten flotation tailings is recovered by gravity separation, the recovery rate of cassiterite is less than 5%; if the cassiterite in the tailings is recovered by flotation method, the cost of mineral processing is high, Economic benefit is poor

At present, this type of cassiterite can only be discarded in the tailings and cannot be recovered. Therefore, the comprehensive recovery of cassiterite from the polymetallic ore with low-grade fine-grained cassiterite associated with tungsten has always been a difficult problem in the mineral processing industry.

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