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Method for producing lithopone by utilizing electrolytic zinc acid leaching slag

A technology of electrolytic zinc acid leaching slag and lithopone, applied in the direction of improving process efficiency, etc., can solve the problems of acid consumption, leaching difficulty, low leaching rate, etc., achieve acid improvement with low cost, strong industrial operability, and high product The effect of stable quality

Active Publication Date: 2015-03-11
SICHUAN JUHONG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pyroprocessing process is long, requires a large amount of equipment maintenance, high investment, poor working environment, consumes a large amount of coal or metallurgical coking coal, low benefit, and large environmental pollution
Therefore, hot acid leaching or high-pressure leaching is usually used. These methods still have disadvantages: ① consume a large amount of acid, and the leaching rate is low. It is difficult for electrolytic zinc enterprises to leach in acid environment, and the secondary acid leaching has little practical significance due to the low recovery rate
② If leaching with strong acid, although ZnFe 2 o 4 If it is destroyed, the leaching rate has increased, but the iron leaching rate is also high (up to 60%). The pressure of iron removal is high, and more reagents are consumed. ③The high temperature and high pressure equipment is severely corroded, and the equipment is complex and requires a large investment; ④Operating costs High, poor economic benefit
⑤The final slag discharged is acid leaching slag, which brings new pollution to the environment, so it has to be solidified and landfilled, which not only pollutes the environment, but also wastes resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1. Leaching of electrolytic zinc acid leaching slag: prepare 1500ml of ammonia water-ammonium sulfate solution as ammonia leaching solution, wherein the concentration of ammonia water is 5.5mol / L, and the molar concentration of ammonium sulfate is 0.5mol / L, and the ammonia leaching solution is added per cubic meter 0.05kg of sodium dodecylbenzenesulfonate, 0.5kg of sodium fluorosilicate, and 0.5kg of dicyandiamide. Take 500 grams of acid leaching residue (its composition, calculated by mass ratio, contains 11.86% zinc, 0.97% copper, 28% calcium sulfate, 0.007% cadmium, 0.02% arsenic, and 3.74% lead), and add it to the above ammonia-ammonium sulfate Three stages of leaching are carried out in the immersion solution, and the leaching time of each stage is 3 hours. After solid-liquid separation, 1450ml of final immersion solution (taken away from the rest of the liquid slag) is obtained. The zinc leaching rate is 90.1%. The obtained final immersion solution contains zinc 8...

Embodiment 2

[0045] 1. Leaching of electrolytic zinc acid leaching slag: Prepare 1500ml of ammonia water-ammonium sulfate solution as ammonia leaching solution, in which the concentration of ammonia water is 7.0mol / L, and the molar concentration of ammonium sulfate is 0.3mol / L, and the ammonia immersion solution is added per cubic meter. 0.1kg of sodium dodecylbenzenesulfonate, 0.3kg of sodium fluorosilicate, and 1kg of dicyandiamide. Take 500 grams of acid leaching residue (its composition, calculated by mass ratio, contains 8% zinc, 1.14% copper, 29% calcium sulfate, 0.0086% cadmium, 0.03% arsenic, and 1.65% lead), and add it to the above ammonia-ammonium sulfate Three stages of leaching were carried out in the immersion solution, and the leaching time of each stage was 2 hours. After solid-liquid separation, 1450ml of final immersion solution was obtained (taken away from the rest of the liquid slag), and the zinc leaching rate was 90.9%; the final immersion solution contained 59.1% zinc...

Embodiment 3

[0049] 1. Leaching of electrolytic zinc acid leaching residue: Prepare 1500ml of ammonia water-ammonium sulfate solution as the ammonia leaching solution, in which the concentration of ammonia water is 6.0mol / L, and the molar concentration of ammonium sulfate is 0.9mol / L. 0.075kg of sodium dodecylbenzenesulfonate, 0.45kg of sodium fluorosilicate, and 0.75kg of dicyandiamide. Take 500 grams of acid leaching residue (its composition, calculated by mass ratio, contains 6.1% zinc, 1.37% copper, 24% calcium sulfate, 0.0043% cadmium, 0.025% arsenic, and 2.84% lead), and add it to the above ammonia-ammonium sulfate Three stages of leaching are carried out in the immersion liquid, and the leaching time of each stage is 2 hours. After solid-liquid separation, 1450ml of final immersion liquid (taken away from the rest of the liquid slag) is obtained. The zinc leaching rate is 90.2%; the final liquid contains 66.3g of zinc / L; Contains SO 4 2- 71.9g / L;

[0050] 2. Preparation of Lith...

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Abstract

The invention discloses a method for producing lithopone by utilizing electrolytic zinc acid leaching slag, comprising the following concrete steps of: leaching, carrying out replacement reaction, washing and smashing. By virtue of the steps, zinc is selectively leached by adopting an ammonia-ammonium sulphate method, the replacement reaction is carried out to obtain an nZnS-BaSO4 crystalline solid filter cake, and drying and smashing are carried out to obtain the lithopone product, thus the zinc in the acid leaching slag is effectively recycled and utilized. According to the invention, an ammonia leaching method is taken as an effective treatment technical means on the acid leaching slag, the obtained lithopone product has good quality, sulphate radical required by production is provided by the acid leaching slag, recycling utilization of the acid leaching slag is realized, waste material is changed into things of value, production cost is low, and operation is simple.

Description

technical field [0001] The invention relates to a production process of inorganic pigment lithopone, in particular to a method for producing lithopone by using electrolytic zinc acid leaching residue. Background technique [0002] Inorganic pigment lithopone, also known as lithopone, is a mixed crystal of zinc sulfide and barium sulfate. It has many unique and excellent properties. Lithopone products have formed a series of products, such as high ZnS type, surface treatment type, water dispersion Type, sun-fast type, color type, etc., play an important role in industrial and agricultural production and daily life. Mainly used in coatings, paints, thermoplastics, thermosetting plastics, paper, etc., through surface treatment or TiO 2 Coating can replace part of rutile. [0003] At present, lithopone is mainly produced in China. Most domestic lithopone production still uses traditional methods. The main raw materials are secondary zinc oxide, sulfuric acid and barium sulfide...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B3/14C22B19/00C22B26/20
CPCY02P10/20
Inventor 陈尚全李时春李晓红
Owner SICHUAN JUHONG TECH
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