Method for measuring volatile impurities in commercial molybdenum oxides pretreated by acid

Abstract

The invention provides a method for measuring volatile impurities in commercial molybdenum oxides pretreated by an acid, which aims at overcoming the defects of the existing technology and providing a reasonable, simple and feasible method with stable and accurate result for measuring volatile impurities in commercial molybdenum oxides pretreated by the acid. The technical scheme provided by the invention is as follows: evenly mixing acquired commercial molybdenum oxide samples, weighing a proper amount of the sample into a porcelain dish, placing the porcelain dish into a high temperature furnace, scorching at the temperature controlled at 350-400 DEG C for 2-3 hours, taking out the porcelain dish, cooling to room temperature, weighing, and repeat the process of scorching and weighing; if the difference between the weights obtained by twice weighing is less than 0.05%, finishing measurement, and otherwise continuing scorching until the difference between the weights obtained by twice adjacent weighing is less than 0.05%; and calculating the content of the impurities in the commercial molybdenum oxide sample according to the weight change before or after scorching.

Description

technical field [0001] The invention relates to a method for measuring volatile impurities in molybdenum calcined sand after acid pretreatment, which ensures stable and accurate analysis results of volatile impurities and ensures that molybdenum samples are not easy to absorb moisture. Background technique [0002] Molybdenum concentrate contains recyclable rare metal elements, and a considerable part will remain in the molybdenum calcine after roasting. In order to recover this part of rare metals, it must be treated with acidic medium, and at the same time, molybdenum should be avoided in the water phase. Therefore, there will be ammonium salt components in the water phase or the waste water produced by the production process is used for pulping treatment, and then the solid-liquid separation step makes the rare metal salt dissolve in water, and the molybdenum baking powder containing moisture is obtained through solid-liquid separation. Sand, this kind of calcined sand co...

AI Technical Summary

Problems solved by technology

[0002] Molybdenum concentrate contains recyclable rare metal elements, and a considerable part will remain in the molybdenum calcine after roasting. In order to recover this part of rare metals, it must be treated with acidic medium, and at the same time, molybdenum should be avoided in the water phase. Therefore, there will be ammonium salt components in the water phase or the waste water produced by the production process is used for pulping treatment, and then the solid-liquid separation step makes the rare metal salt dissolve in water, and the molybdenum baking powder containing moisture is obtained through solid-liquid separation. Sand, this kind of calcined sand contains a certain amount of water and ammonium salt soluble in water. When this kind of calcined sand is sold to the outside world, it needs to measure the moisture content. When the conventional method is used to dry and measure the water content, the entrained ammonium salt is very easy to absorb moisture. As a result, the deviation of the moisture analysis results is relatively large, and at the same time, the analysis results of molybdenum are always low due to moisture absorption, which causes losses to the economic benefits of the enterprise