Method for producing high-purity nanometer zinc oxide by using ammonia process decarburization of steel plant dust

Abstract

The invention discloses a method for producing high-purity nanometer zinc oxide by using ammonia process decarburization of steel plant dust. The method for producing high-purity nanometer zinc oxide by using ammonia process decarburization of steel plant dust comprises the following steps of: carrying out leaching with an ammonia-ammonium carbonate solution as the leaching agent, adding 0.3-0.5kg of sodium fluosilicate into the leaching agent per cubic meter to obtain a leaching solution, then adding 50-60kg white lime into the leaching solution per cubic meter to carry out heating decarburization, and carrying out purification and impurity removal and then refining treatment. According to the method, the ammonia process is used for treating steel plant dust, and the existing ammonia process is adaptively improved, the leaching speed and the leaching rate of zinc in the dust are improved, and zinc oxide with the purity of more than 99.7 percent can be obtained; the method has the advantages of low energy consumption and high efficiency, and thoroughly solves the problem of zinc load of steel plant dust as the leaching agent can be recycled, thereby meeting the requirement of purifying the toxic components including zinc and alkali metals and realizing good production circulation.

Description

technical field [0001] The invention relates to a production method of zinc oxide, in particular to a production method of high-purity nanometer zinc oxide. Background technique [0002] At present, soot ash from steel mills (including blast furnace ash, converter ash, electric furnace ash), also known as soot storage ash, will produce 35-90kg of soot ash for every ton of steel produced. This soot ash generally contains 15-30% iron %, containing 4-5% silicon oxide, 5-22% zinc, 25-55% combustible fixed carbon (C), 2-5% calcium oxide, 1-2% magnesium oxide, titanium, vanadium and alkali metals, etc. . Under normal conditions, the sintered ore is generally used as a raw material for sintering, and is recycled in the steel plant. With the enrichment of the cycle, the zinc load into the furnace is getting higher and higher, which seriously affects the normal operation of the blast furnace. [0003] At present, the methods of limiting the zinc load of blast furnaces are as follow...

AI Technical Summary

Problems solved by technology

The first method is not an economical and effective method to reduce the zinc load of blast furnace, but also brings environmental pollution

The second is to enrich zinc into the tailings, but the three products of iron concentrate, carbon concentrate, and tailings are out of balance, and high iron and carbon resources are still lost

[0009] 1. Due to the low zinc content in dust storage ash from steel mills (generally containing Zn%=5-22), the zinc concentration in the leaching solution is low, the consumption of leaching agents is large, and the cost is high, which cannot be afforded by the enterprise

[0010] 2. Due to the complex composition of impurities, the production can only be ordinary active zinc oxide products and the pass rate is low, the product price is low and the economic benefit is poor

[0011] 3. When leaching by conventional means, the leaching rate of soot and ash is low, the recovery rate is low, the recovery of iron and carbon resources has not formed a complete chain, and the value of soot and ash has not been reflected

High-temperature calcination seriously affects the specific surface area, dispersion and fluidity of zinc oxide, which in turn affects its application fields