CAJ | 학술논문

针对碳酸钠选择性浸出钨钼混合矿的理论问题，选取25℃条件下的热力学数据，计算并绘制了不同总碳浓度条件下的Ca-W-Mo-C-H2O体系主要离子的浓度对数图，以及溶液中总钨、总钼的浓度与pH关系图，分析了CO32-浓度以及pH值对钨酸钙和钼酸钙混合体系选择性浸出的影响.结果表明：溶液中钨钼饱和浓度随着CO32-浓度的增加而增加，且钼的饱和浓度是钨饱和浓度的1.85倍；在总碳浓度一定的条件下，CaMoO4比CaWO4更易分解；为了避免低pH值下CO32-以HCO3-形式存在导致钨钼浸出率降低，溶液需要保持较高的碱度.通过控制溶液总碳浓度及pH值，可以达到钨钼混合矿选择性浸出钼的目的.
침대탄산납선택성침출오목혼합광적이론문제，선취25℃조건하적열역학수거，계산병회제료불동총탄농도조건하적Ca-W-Mo-C-H2O체계주요리자적농도대수도，이급용액중총오、총목적농도여pH관계도，분석료CO32-농도이급pH치대오산개화목산개혼합체계선택성침출적영향.결과표명：용액중오목포화농도수착CO32-농도적증가이증가，차목적포화농도시오포화농도적1.85배；재총탄농도일정적조건하，CaMoO4비CaWO4경역분해；위료피면저pH치하CO32-이HCO3-형식존재도치오목침출솔강저，용액수요보지교고적감도.통과공제용액총탄농도급pH치，가이체도오목혼합광선택성침출목적목적.
For theoretical issues of powellite soda selective leaching, equilibrium diagrams of Ca- W-Mo-C-H2O system were drawn on the basis of thermodynamic data at 25 ℃. Total concentration of ions (W, Mo)-pH relationship diagrams were depicted. The effects of system pH value and total carbon-containing ions concen-tration on mixed system selective leaching were analyzed. Along with the concentration of CO 32-increasing, the total (W, Mo)concentration in the solution was added. The saturation concentration of Mo is about 1.85 times that of W. Under a certain total carbon concentration, CaMoO4 is more likely to decompose than CaWO4. In ad-dition, the high pH value should be maintained to avoid an unexpected abundant of HCO 3- instead of CO32-mainly existing under low pH value, leading to the decrease of W and Mo leaching rate. By controlling the total carbon concentration and pH value of the solution, Mo can be obtained by the effects of W and Mo selective leaching.