Vacuum plasma flash reducing system for jarosite residues

Abstract

The invention relates to a vacuum plasma flash reducing system for jarosite residues. The system comprises a plasma gun, a vacuum chamber and a vacuum pump, wherein the plasma gum comprises a gun body, a negative electrode which is arranged in the gun body, and a positive electrode which is connected to the gun body; the tail end of the positive electrode is arranged on the sidewall of the vacuumchamber; a plurality of recovering funnels for recovering produced materials at different positions are arranged at the bottom part of the vacuum chamber; discharging holes are formed in the bottom parts of the recovering funnels; the vacuum pump is connected to the vacuum chamber. According to the system, the ratio of pulverized coal and the flow rate of reducing gas are regulated to effectivelyreduce the ammonium jarosit; the reaction is quick and efficient; the flash reducing is realized, so that the production efficiency can be obviously improved; the system is safe, reliable, and free from pollution; secondary resource in the ajarosite residues can be effectively comprehensively recovered and utilized.

Description

technical field [0001] The invention belongs to the technical field of plasma applications, and in particular relates to a vacuum plasma flash reduction system for alumina slag. Background technique [0002] The process of zinc hydrometallurgy is that the zinc sulfide concentrate is subjected to sulfuration and roasting, and the obtained calcined sand is leached with sulfuric acid solution. After the leaching liquid is purified from impurities, the leaching liquid obtained with less impurities is called the net liquid, and the net liquid is electrowinning. Production of zinc metal. There is more iron in the leaching solution obtained after calcine leaching, and the iron content is about 20g / L. In order to remove iron in the leaching solution, the methods adopted include jarosite method, jarosite method, goethite method and The hematite method, etc., is rarely used due to the high cost of the hematite method. The common iron removal methods are mainly the jarosite method and...

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Problems solved by technology

The advantage of the high-temperature reduction volatilization method is that lead, zinc, indium, etc. in the alum slag can be recovered at the same time, and all these elements can be collected into the zinc oxide dust. In the process, it is in a melt state, and a large amount of silicate is mixed in the melt, resulting in a low iron yield in the iron-containing slag

The advantage of the aqueous solution leaching method is that the iron content in the iron-containing slag after leaching reaches about 55%, but the zinc content in the slag is relatively high, and the zinc content is generally above 1%, because this part of zinc mainly exists in the form of zinc ferrite. When iron is used as a raw material for ironmaking, zinc can adversely affect the ironmaking process

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