Tungsten Industry: Commitment to overcome technical difficulties

On March 30, 2016, Tungsten APT production line was commissioned, and the production line was developed by Luomo Group and Central South University. “Soda High Pressure Leaching-Alkaline Extraction-Volatile Crystal Crude Separation Tungsten-Molybdenum-Ion Exchange Depth Molybdenum-Evaporation Crystallization The new process of producing APT and the new process of “molybdenum-rich crystallization mother liquor extraction and tungsten-salt crystallization” produces ammonium tetramolybdate, which realizes the high quality utilization of tungsten and molybdenum and the recovery of phosphorus resources.

After two weeks of operation, the content of WO3 in the open-tungsten slag in the process can be stably controlled to be less than 0.5%, and the phosphorus in the scheelite is recovered in the tungsten slag. According to the characteristics of the process flow, the workshops of the tungsten industry company are tested in the order of "equipment pipelines with water commissioning-feeding-equipment pipelines with material debugging". According to the trial production plan, the extraction workshop must complete the filling, preparation and transformation of the organic phase prior to the commissioning.

The organic phase is made up of three reagents, each of which has an amount ranging from 50 to 100 tons. The main ingredient of the extractant is a small variety of organic reagents. There are only a few manufacturers and they are all packed in 20kg kegs. There is a total of 5000 barrels to be used. In addition, due to the special nature of the reagent, it is in the form of a creamy solid at room temperature, and it is difficult to pour and must be dissolved by heating. Due to the fact that the site does not have processing conditions, we collectively brainstormed and made full use of various conditions to place the extractant in the cofferdam of the outdoor tank area of ​​the dismantling plant. The solution was dissolved by steam heating the water. For this purpose, the extractant needs to be manually transported from the original storage location to the reclamation area, and then dissolved and transported to the preparation area of ​​the extraction plant for dumping. In the preparation process, since the reagent belongs to an ammonium-containing solvent, ammonia gas and other gases are volatilized easily after heating, and the working environment is harsh. Under the premise of fully considering safety and environmental protection, we have adopted a form of forced ventilation in the preparation tank area to ensure the personal safety of operators.

The configuration of the organic phase is a very critical node in the trial production plan, and at the same time it is the most urgent task. According to the overall deployment and arrangement, it must be completed within 4 days. Faced with great difficulties and challenges, Tungsten Industry Co., Ltd. overcomes many unfavorable factors such as tight schedules, low personnel, and high labor intensity. The workshops and departments are able to deploy elite troops and establish an organic phase without affecting normal work. Commando. Yu Chengxin, the manager, personally led the team and coordinated the organization. The assault team continued to work day and night, started the preparation of the organic phase. After four days of continuous fighting, the organic phase was completed on schedule.

Tungsten smelting industry started construction to trial production for two years, and Tungsten Industry Co., Ltd., under the leadership of the leadership team of “sincere solidarity and cohesion”, with the strong support of the company’s senior management and departments, used only seven The target was completed within a month, which laid a solid foundation for the smooth production of the next step and the completion of the production tasks of the group company.