Defoaming method of sodium tungstate solution

Abstract

The invention discloses a defoaming method of a sodium tungstate solution, and relates to the technical field of tungsten smelting.The method comprises the following steps: leaching a tungsten mineral raw material, carrying out solid-liquid separation, adding a defoaming agent, transforming the sodium tungstate solution and crystallizing to obtain an ammonium paratungstate product, wherein the step of adding the defoaming agent refers to adding at least one defoaming agent into the obtained sodium tungstate solution, the defoaming agent is dispersed in the sodium tungstate solution through a stirring and / or heating method, and the defoaming agent comprises one or more of an organic silicon defoaming agent, castor oil, aldehydes, alcohols, ketone, kerosene and tertiary amine. The method has the beneficial effects that the defoaming agent is added into the obtained sodium tungstate solution, so that the influence of a surfactant in the sodium tungstate solution on the production process can be effectively inhibited, the feed liquid conveying time is effectively shortened, a better solution purification effect is obtained, a high-quality ammonium paratungstate product is obtained, and production accidents can be reduced.

Description

technical field [0001] The invention relates to a tungsten smelting process, in particular to a defoaming method for sodium tungstate solution, belonging to the field of metallurgy and chemical industry. [0002] In this specification, the term "flotation-type tungsten raw material" refers to tungsten mineral raw material suitable for smelting obtained by flotation. Flotation is a beneficiation method, which refers to the beneficiation process of floating solid minerals from the water suspension (ore slurry) according to the differences in the physical and chemical properties of the mineral surface. Flotation-type tungsten raw materials include scheelite, tungsten slime, etc. [0003] The term "regeneration" refers to the ionization of the extractant in the acid. [0004] The term "loaded" means that the tertiary amine in the extracted organic phase is regenerated with sulfuric acid and exists in the form of tungstate. [0005] The term "unloaded" means that the tertiary am...

AI Technical Summary

Problems solved by technology

The disadvantage of the prior art is that the high temperature of the roasting process leads to high energy consumption, high labor intensity and poor working environment, and produces a large amount of roasting smoke that is difficult to control, thereby causing huge environmental risks, especially the random mixing of multiple batches of tungsten mineral raw materials during the roasting process ( Due to the small output and high price of tungsten, tungsten mineral raw materials are usually in batches of ten tons, and the tungsten content varies greatly between batches), resulting in unclear grades of tungsten mineral raw materials entering the smelting process during leaching, which seriously affects subsequent ingredients , leaching and other operating processes, in order to ensure the leaching rate of tungsten mineral raw materials, the leaching agent is usually excessively mixed in production, which causes the leaching agent to be wasted. What's more, the roasting process leads to a large loss of tungsten mineral raw materials, resulting in great losses. Waste of resources, poor economy

According to production experience, the tungsten loss rate caused by the roasting process of tungsten mineral raw materials in the prior art is about 2.5%

Even after roasting, there may still be surfactant residues due to poor roasting effect, such as abnormal feeding rate, temperature fluctuation, insufficient time, etc.

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