The filter residue decomposed by tungsten concentrate contains 钪 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
There are many kinds of products which need filtration in industrial production. The material properties of these products are very different, and the purpose of separation is different. Therefore, it is necessary to select the filter equipment scientifically and reasonably according to the production needs such as material characteristics and separation purposes, in order to play its role effectively.
At present, the requirement of filtration equipment in industry is that the filtration accuracy is high, so that the solid content in the filtrate is low, and even the filtration precision is based on the number of solid particles in the filtrate.
In order to ensure the stability and reliability of the system, the cleanliness of the oil with precision components such as servo parts is strictly controlled in the international hydraulic system, and the new oil cleanliness is required to reach the fifth grade of the American Aerospace Standard nas1638 (American Aerospace Standard), so as to ensure the stability and reliability of the system. But in reality, the cleanliness of new oil is only 10-11 of nas1638. If the new oil is used without strict filter and purification, it will bring serious harm to the life of the precision components and the reliability of the work of the whole system. The cleanliness of hydraulic oil can be improved fundamentally only when circulating filtration is carried out simultaneously with the operation of hydraulic system.
Reverse osmosis filtration equipment is widely used in industrial production, industrial pure water system is designed from reverse osmosis process, referred to as reverse osmosis equipment. The water quality of reverse osmosis equipment is required before influent. If the water flow through reverse osmosis membrane directly through high pressure for a long time, it will cause membrane blockage.
In general, there are multi-medium filters, ion exchange, various kinds of Precision Filters in the pre-treatment equipment of the whole pure water system. These pre-treatment filters can effectively remove the suspended matter in the water.
According to the needs of the users, different levels of processes are used to make the quality of the produced water up to the standard. Of course, its price is also determined by the configuration of reverse
osmosis equipment.
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