Method for recycling tungsten in liquids after tungsten smelting exchanges

Abstract

The invention discloses a method for recycling tungsten in liquids after tungsten smelting exchanges. The method includes pH of liquids after exchanges is regulated to 8 to 10 by using sulfuric acids; calcium in liquids after a mother liquor is crystallized by using ammonium tungstate (APT) in calcium oxide or calcium hydroxide with tungsten and ammonia recycled to serve as a precipitating agent for precipitating tungsten, and a temperature of a reaction process is raised to 70 DEG C to 80 DEG C; the mixture is mixed fully to form scheelite precipitation; and filter residues are returned to a press cooking leaching process after filtration, and waste liquids are sent to a wastewater treatment process for treatment. According to the method, a method for recycling tungsten and ammonia in a tungsten smelted APT crystallization mother liquor with the application number of 20110307349.0 is combined, and partial solutions containing calcium chloride serve as precipitant materials for recycling tungsten in liquids after exchanges, accordingly, resources are recycled, salt discharges are reduced, costs for buying calcium chloride material are reduced in terms of economic benefits, and internal circulation is achieved. According to the method recycling tungsten in liquids after tungsten smelting exchanges, the technological process is simple, the tungsten precipitation rate is high, and the economic benefit is good.

Description

technical field [0001] The invention belongs to tungsten hydrometallurgy, in particular to a method for recovering tungsten in liquid after tungsten smelting and exchange. Background technique [0002] my country is a country with abundant tungsten resources and the country with the largest tungsten smelting capacity. Tungsten resources mainly exist in the form of wolframite and scheelite. With the decreasing amount of wolframite resources, mining scheelite resources has become the main mineral variety of tungsten resource mining. Therefore, the smelting technology of scheelite has also been vigorously developed. Ascension, technical process is further improved and mature. High alkaline pressure leaching of scheelite concentrate - ion exchange process has become the main process of tungsten smelting in my country. As the awareness of resource scarcity has been widely recognized, it has become a consensus to carry out comprehensive recycling of resources. Therefore, most tu...

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Problems solved by technology

[0004] 1. Precipitation method, calcium chloride artificial scheelite precipitation method; this process usually uses calcium chloride as a precipitant, and supplemented with sodium hydroxide to adjust the pH value. This method is commonly used in the recovery of tungsten from ammonium paratungstate crystallization mother liquor. This method In practical applications, it is generally reflected that the precipitation of tungsten is not complete, and the content of tungsten in the liquid after precipitation is still in the range of 100-200mg / L. Incomplete tungsten precipitation

[0005] 2. Ion exchange method. This process usually uses acid to lower the pH value first, and then adsorbs tungsten through a large-pore resin. The desorption solution uses a strong alkali solution, and sodium tungstate is returned to the main process. The recovery rate of this process is It is relatively high and has been vigorously promoted and applied. The disadvantage is that the process is relatively long

[0006] In addition to these two processes, there are residual alkali decomposition method and special reagent selective precipitation method. These methods are also unsatisfactory in actual production and application.

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