| China's tungsten resources, production and export quantity are all in the first place of the world. Shizhuyuan Polymetallic Mine is the biggest one, which possesses20.7%explored tungsten resources of the world. However, its ores is hard to be separated and utilized comprehensively due to the low grade and the complicated composition. WO3beneficiation recovery in this mine was only62.6%for a long time. Thus, it is significant to do some research and thereby develop a new mineral-metallurgical processing for this low-grade, complicated and refractory tungsten ore.In the aspect of beneficiation research, a novel flowsheet of "iron removal by weak magnetic separation-slimes removal by flotation-scheelite and wolframite bulk flotation" is designed, by which a low grade WO3scheelite and wolframite bulk concentrate could be directly produced by normal temperature flotation. The relationship between tungsten concentrate WO3grade and WO3recovery was determined. Compared with the present process for warming flotation to preduce65%WO3concentrate, the better test index was obtained by the new process for normal temperature flotation to preduce30%WO3rough concentrate in small-sized closed circuit test and industrial test, and WO3total recovery was increased for482.1t/a.In the research field of flotation new process mechanism, EDLVO theory is introduced for the calculation. which shows that, in the case of hydrophobic system, the value of total EDLVO potential energy of fine grain sludge ore acting on tungsten minerals VEDTotal is negative. This means that fine grain sludge ore would be flocculated with tungsten minerals in an automatic way. Based on the theoretical calculation and the actual detection on Zeta potential, it suggests that the fine minerals of fluorite, scheelite and wolframite might electrocoagulate together. These phenomena are harmful for the fine grain sludge ore in the case of tungsten ore flotation separation. Therefore, the predesliming is necessary and reasonable. Analysis with infrared spectroscopy showed that the effect mechanism of collector GYB on wolframite is generating a hydrophobic dissolvable chelate through surface chemical absorptionIn the research field of hydrometallurgy, the tungsten rough concentrate high alkali autoclaving process and the condense crystallizing-tungsten alkali separating-alkali recycling process were developed for low grade rough concentrate and middling raw material. The relationship of different WO3grade concentrates and unit production costs of WO3dissolution was determined.In the research field of technological economy evaluation theory, an assessment model is set up by the author for a changed economic benefit E of the new mineral-metallurgical processing. E is fluctuated relative to Po, where Po is the metal price of the100%WO3product. The concentrate grade of the present process is65%WO3and the rough concentrate grade of the new process is30%WO3. Calculated result of E showed that if the new process is used and if Pois fluctuated to Po (3o%WO3process)-9.55×104(RMB/t WO3), E should come up to breakeven point, therefore bringing applicability of the new processing. When Po continues to rise, E should rise rapidly. The new processing has great comprehensive profit benefits and is recommended.The economic benefit E of the mineral-metallurgical processing has no concerns to mineral product metal price Pi with a β1grade concentrate under the existing process and to the mineral product metal price P2with a β2grade concentrate under the new process. However, the values of P1and P2would directly influence distributive proportion of E between mineral processing benefit Ed and metallurgical processing benefit Em. One condition is set up based on the comprehensive balance between the mineral processing benefit and the metallurgical processing benefit, and some benefits given by the more profitable side to the side whose cost is rolling up. Under this condition, a calculating method was derived for P2, the reasonable theoretical base line price of mineral product metal produced by new process with β2grade concentrate; thereby a correlating calculation method was derived for P0, P1and P2, which should be contributed to a balanced distribution of E between Ed and Em.Calculated results in the case of Shizhuyuan Polymetallic Mine show that the assessment model of E research is reasonable. This evaluation model of E can be used back to guide drawing up economic parameters in actual production of tungsten under the mineral-metallurgical processing, and to coordinate profit distribution of the mineral processing side and the metallurgical processing side, so as the two sides to be conducive to the acceptance and implementation of the new procesing in production.
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