Green Energy Saving Tungsten Tin Separation Method

There has always been a low (poor) grade tungsten tin associated ore in the tungsten-tin production industry, especially in Yunnan Province. Due to the similarity of the material and chemical properties of the two metal compounds, the separation of the two metals in the industrial production process has always been a difficult problem for the industrial production technology. The traditional production methods have always had the defects of high pollution and high energy consumption, and it is difficult to conform to the national industrial policy.

A low-grade tungsten-tin ore in Yunnan Province was used to produce ammonium paratungstate by environmental protection, including the following steps: grinding, pulping flotation desulfurization, continuous flotation to obtain tungsten-tin mixed concentrate, gravity beneficiation, respectively, to produce tungsten concentrate and tin concentrate, tungsten concentrate (white) using acid leaching process, ammonia dissolution, crystallization process to produce paratungstic acid. Ammonium products, clean waste gas and wastewater during the process.

1. Mineral raw materials are abrasived by wet ball mill to size less than-150 mesh, then pulped by stirring barrel, then pumped into flotation tank by mud pump, desulfurizer is added to desulfurize. The desulfurizer is usually used, such as ferric oxide desulfurizer, and it does not need to add acid and alkali, and the sulfur concentrate is obtained under neutral conditions. After dehydration, sulphur concentrate is sold to a sulphuric acid enterprise.

2. The remaining desulphurized ores were separated by belt filters and then wet-milled twice to size less than-200 mesh. Then the desulphurized ores were put into stirring barrels for pulping. After slurry pumping, the remaining desulphurized ores were fed into flotation machine and flotation agents were added to flotation tungsten-tin mixed ores. The flotation agents were MB series flotation agents, and the tailings were stirred with a small amount of lime. Water quality treatment, solid-liquid separation after filtering by belt filter, tail water return to pulping process for recycling.

3. After the applied gravity is 1G), scheelite concentrate (including WO3: 40-55%, Sn: 2~3%) and tin concentrate (including Sn: 40-45%, WO3: 0.5~) 1.5%), tin concentrate is sold as a product; sulphur concentrate is added to the acid immersion kettle, concentrated hydrochloric acid is added to acid immersion at normal temperature of 90 ° C, acid leaching for 2 hours, and solid-liquid separation is achieved by pressure filtration of the filter press to obtain The tungsten solid material is combined with the previously produced primary calcium chloride product; the tungsten-containing solid material is added to the ammonia solution tank, and then ammonia is added to dissolve the ammonia to obtain a crude ammonium tungstate solution, and then the temperature rises, and when the temperature rises to 45 ° C ( In the impurity removal process, the temperature is generally controlled at 45 to 55 ° C, and the ammonia solution process itself is an exothermic process, which reduces the production cost.

In this scheme, the waste water, waste residue and waste gas produced in the production process are utilized by scientific and environmental protection technology to produce qualified by-products and turn waste into treasure, which not only realizes the green and environmental production of the industry, but also maximizes the profits of the industry.

• < Prev
• Next >