Green and Energy-saving Separation of Tungsten-Tin Ore

There has always been a low (poor) grade tungsten-tin associated ore in the tungsten-tin production industry, which is particularly common in Yunnan. Because the material and chemical properties of the two metal compounds are similar, the separation of the two metals in the industrial production process has always been a difficult problem that puzzles the industrial production technology. The traditional production method has been characterized by high pollution and high energy consumption, which makes it difficult to conform to the national industrial policy.

A low-grade tungsten-tin ore in Yunnan Province is used to produce ammonium paratungstate in an environmentally friendly way, which includes the following steps: grinding, slurry flotation desulfurization, continuous flotation to obtain tungsten-tin mixed concentrate, gravity beneficiation, respectively, to produce tungsten concentrate and tin concentrate, tungsten concentrate (scheelite) to produce paratungstic acid by acid leaching process, ammonia dissolution and crystallization process. Ammonium products; Waste gas and wastewater in the process are cleaned.

1.The mineral raw materials pass through the wet ball mill abrasive to the size of less than-150 mesh, after pulping in a stirring barrel, they are pumped into the flotation tank by a mud pump, and desulfurizer is added to desulfurize the mineral. The desulfurizer is usually used, such as iron oxide desulfurizer, without adding acid or alkali, and the sulphur concentrate is obtained under neutral conditions. After dehydration, the sulphur concentrate is produced and sold to sulphuric acid enterprises.

2.After the remaining desulfurized ore is separated by belt filter, it is subjected to secondary wet ball milling to particle size less than 200 mesh, then it is subjected to stirring barrel for pulping. After slurry pump, it is fed into flotation machine and flotation agent is added to the tungsten-tin mixed ore. The flotation agent is MB series flotation agent, and the tailings are stirred with a small amount of lime. The water quality is treated and filtered by a belt filter to achieve solid-liquid separation, and the tail water is recycled in the pulping process.

3.After application of gravity of 1G, Scheelite Concentrate (containing WO₃:40-55%, Sn:2-3%) and tin concentrate (containing Sn:40-45%, WO₃:0.5-1.5%) are prepared respectively, and tin concentrate is sold as products. Scheelite concentrate is added to acid leaching kettle, concentrated hydrochloric acid is added to acid leaching at 90 C at room temperature, acid leaching for 2 hours, and solidified by pressure filter. After liquid separation, tungsten-containing solid material is obtained and merged with the primary calcium chloride products which were produced before; tungsten-containing solid material is added to ammonia solution tank, then ammonia water is added to ammonia solution to produce crude ammonium tungstate solution, and then the temperature begins to rise. When the temperature rises to 45 ℃ (the general temperature of impurity removal process is controlled at 45-55 ℃, the solution itself is ammonia solution. Exothermic process, reduce production costs.

In this scheme, the waste water, waste residue and waste gas produced in the production process are utilized by technological means of environmental protection, and other qualified by-products are produced, which not only realizes the green and environmental protection production of the industry, but also maximizes the profits of the industry.

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