(1. 中南大學(xué) 資源加工與生物工程學(xué)院，長沙 410083；
2. 朝陽師范高等專科學(xué)校 生化工程系，朝陽 122000)
摘 要: 通過溶液化學(xué)計(jì)算、SEM-EDAX分析、ζ電位測試并結(jié)合浮選實(shí)驗(yàn)，以Na2CO3和六偏磷酸鈉為調(diào)整劑，研究Ca2+存在體系中菱錳礦和方解石的浮選分離。結(jié)果表明：六偏磷酸鈉對菱錳礦與方解石單礦物的浮選具有良好的選擇性抑制作用，但在二者混合礦的浮選分離中，方解石溶出的Ca2+在調(diào)漿過程中可與Na2CO3反應(yīng)生成CaCO3吸附在菱錳礦表面，使二者表面性質(zhì)趨同，難以實(shí)現(xiàn)浮選分離；改變藥劑添加方式，優(yōu)先加入六偏磷酸鈉絡(luò)合溶液中的Ca2+，阻止其在菱錳礦表面吸附，避免菱錳礦表面性質(zhì)改變，再加入Na2CO3調(diào)節(jié)礦漿pH，最終實(shí)現(xiàn)菱錳礦與方解石的浮選分離。
關(guān)鍵字: 菱錳礦；方解石；六偏磷酸鈉； 鈣離子；浮選
（1. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China;
2. Department of Biology and Chemical Engineering, Chaoyang Teachers College, Chaoyang 122000, China）
Abstract:The separation of rhodochrosite from calcite was studied by solution chemistry calculations, SEM-EDAX, ζ potential measurements and flotation tests in the presence of Ca2+, using Na2CO3 and sodium hexametaphosphate (SHMP) as regulators. The results show that SHMP has good selective inhibition in the pure mineral flotation of rhodochrosite and calcite, while in the flotation separation of mixed mineral, Ca2+ dissolved from calcite during pulp conditioning reacts with Na2CO3 to produce CaCO3 that adsorbs on the rhodochrosite surface. This situation makes the two minerals surface property similar and so it is difficult to achieve the flotation separation of rhodochrosite from calcite. When the method of chemicals addition is changed with SHMP added first, a complexation of Ca2+can be made, which avoids the adsorption of Ca2+ on rhodochrosite surface and prevents rhodochrosite surface property from changing. Then by adding Na2CO3 to adjust solution pH , the flotation separation of hodochrosite from calcite will be achieved finally.
Key words: rhodochrosite; calcite; sodium hexametaphosphate; Ca2+; flotation
