含硫低品位锡尾矿的综合利用

某低品位锡尾矿中锡和硫的品位分别为０．２７％和５．０７％，具有综合回收价值，锡和硫在－０．０２５ ｍｍ粒级的分布率分别为６１．６４％和７６．７４％，综合回收难度较大. 试验结果表明，摇床和磁选均没有显著地选别效果，浮选则可以较好地达到选别的目的；选别工艺上，可先使用浮选预先脱硫，脱硫后进一步选别锡；相对于摇床，浮选能更有效地回收锡；硫化矿的存在会显著影响锡的选别，较为彻底的脱硫可改善锡的浮选指标；使用三段浮选脱硫工艺，硫的脱除率可达９０％以上；脱硫的过程中会损失部分的锡，可通过对硫粗精矿再磨后，完成锡和硫的进一步分离；通过浮选闭路流程，最终可获得硫品位和回收率分别为４２．７１％和８９．８４％的硫精矿，以及锡品位和回收率分别为３．１６％和６０．３７％的锡精矿.

Comprehensive utilization of low grade sulfur-bearing tin-tailings

The grades of tin and sulfur are 0.27% and 5.07% in a low grade tin tailings. In size fraction of less 0.025 mm, the distributing ratios of tin and sulfur are 61.64% and 76.74%, respectively, so comprehensive utilization of tin and sulfur is extremely difficult. The results show that the separation results of shaking table and magnetic do not reach the satisfactory effect, but flotation can separate the tin tailings more effectively; base on separation flow, firstly, we use flotation to desulfurization, then separate tin after desulfurization finished; flotation is better than shaking table to beneficiate tin; because sulfide minerals can adversely affect beneficiation of tin, separation results of tin flotation is improved by more thoroughly desulfurization; through three sections of flotation desulfurization, the rate of sulfur removal is exceeding 90%; because a part of tin is lost in sulfur rough concentrate,we need to regrind sulfur rough concentrate for further separating tin and sulfur. Finally, through closed circuit flotation, we get the sulfur concentrate with sulfur grade of 42.71% and recovery of 89.84% and the tin concentrate with tin grade of 3.16% and recovery of 60.37%.