Beneficiation of complex polymetallic ore containing niobium

For more complicated antimony-containing metal minerals, often accompanied by heavy non-ferrous sulfide raw o'clock: arsenopyrite FeAsS, realgar AsS, As2S3 Orpiment arsenic-containing sulfide minerals; galena lead sulfide minerals and the like; and the like zinc sulfide sphalerite minerals; cinnabar mercury-containing sulfide minerals and the like. Oxidized minerals with significant economic value, such as cassiterite , scheelite , etc., are also associated with precious metal minerals such as natural gold. Therefore, it is necessary to test the comprehensive recovery problem during mineral processing . The description is as follows:

(1) Recycling cassiterite

The cassiterite oxidized ore can be recovered by re-election-flotation-re-election process: firstly, some of the tailings are lost by re-election (or heavy medium selection), and the coarse concentrate is mixed, and then the whole flotation is used to obtain tin. The mixed concentrate of Shihe stibnite ore, after classification, the coarse particles are re-selected to recover cassiterite, and the fine granules are used to separate bismuth and tin (first floating bismuth), and the whole flotation tailings still contain cassiterite. It is also recycled by re-election, such as the Guangxi Changchang Changpo Plant.

(2) Recovery of scheelite

The scheelite is also an oxidized ore and can be combined by a re-election flotation process. The coarse-grained inlaid part of the ore is recovered by re-election, and the fine-grained inlay is partially ground and floated (gold), then the scheelite is floated. It is also possible to recover tungsten from the raft (gold) tailings by re-election. Such as Hunan Xiangxi Woxi é”‘ selection plant. The flotation scheelite of the plant adopts alkaline pulp, the temperature is 20~25Â°C, and sodium carbonate, water glass and oleic acid are used as flotation reagents, and the dosages are 1800-2200, 600-800 and 140-180 g/ton respectively.

(3) Recovery of arsenic (gold) minerals

The arsenic (gold) minerals are roughly similar to the sulphide ore. There are two technical solutions for recovering associated arsenic (gold) minerals from stibnite:

First, at time = pH 6.5, copper sulfate, lead nitrate, as the activator, black powder and xanthate as collector, for antimony, arsenic (gold) flotation, the concentrate mixed with sodium carbonate, sodium sulphide adjusting The pulp pH is 11, and the arsenic (gold) is suppressed, which achieves the separation of bismuth and arsenic (gold). Such as Hunan Xinshao Longshanyu Plant and Guizhou Sandu Miaolongtun Plant.

Secondly, the use of butylammonium black drug as a collector can achieve the separation of arsenic and arsenic, because the drug has weak absorption performance for arsenopyrite, and has strong absorption performance for stibnite, which can be used as a collector. The effect of arsenic (gold) floating rafts. Such as Hunan Taojiang Banxijing Plant and Taojiang Yulihe River Selection Plant.

(4) Recovering cinnabar

The method is first activated by Pb2 + ions, antimony minerals mixed concentrate and flotation of minerals mercury, chromium, potassium and added weight to suppress floating cinnabar stibnite, potassium dichromate can be generated because the hydrophilic surface of the mineral stibnite PhCrO4 The film, so that the stibnite minerals can be floated and deteriorated, and the flotation is blocked, so as to achieve the purpose of separating the mercury. China Mining and Metallurgy Research Institute as white silver Wangxiu Yao and others on a large antimony mercuric sulfide deposits in China's Shaanxi Province.

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