The filter residue decomposed by tungsten concentrate contains é’ª 0.3%-0.4%, which is an important raw material for the recovery of strontium.

Fu Shiye studied the separation and purification of cesium from the slag obtained by reduction and smelting of tungsten slag. After smelting reduction, tungsten slag niobium, tantalum, tungsten, iron and manganese to produce iron alloy; and scandium, thorium and uranium enrichment in the slag in the table below.

Table Composition of tungsten slag and reduced smelting slag (%)

The smelting slag is mixed with water, and the hydrochloric acid of the processing industry is leached at 80-90 ° C for 0.5 h, then the soft manganese ore is added as an oxidizing agent, and stirred at a constant temperature for 3.5 h, and the solid-liquid ratio is 1:6 to 7:1. The filtrate was separated by suction filtration, and hydrazine was recovered by cascade extraction.

When extracted, first with 50% octanol in kerosene solution, twelve iron countercurrent extraction. The raffinate was subjected to a four-stage countercurrent extraction of uranium with 5% N263 kerosene solution, and the uranium product was decollected by sulfuric acid. The uranium residue is adjusted with a small amount of nitric acid to adjust the acidity, the P350 kerosene solution is subjected to secondary countercurrent extraction, and the organic phase is back extracted with sodium carbonate solution. Finally, the raffinate was extracted with P204 single stage. After the ruthenium-rich organic phase is washed with hydrochloric acid, the sodium hydroxide solution is back-extracted to obtain cesium hydroxide. It is dissolved in hydrochloric acid, precipitated with oxalic acid, and fired at 700-750 ° C for 0.5 h to obtain white loose yttrium oxide. The recovery rate of lanthanum is more than 80%. The process flow is shown in Figure 1.

Figure 1 Process for extracting bismuth from tungsten slag reduction smelting slag

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