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Method for producing high-purity anhydrous zinc chloride

A technology of anhydrous zinc chloride and its production method, which is applied in the direction of improving process efficiency, etc., can solve the problems of high cost and large investment, and achieve the effects of low corrosion, low investment and simple reaction process

Inactive Publication Date: 2011-10-12
新干县金山化工厂 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the production of metal zinc has the disadvantages of large investment and high cost

Method used

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  • Method for producing high-purity anhydrous zinc chloride

Examples

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Comparison scheme
Effect test

Embodiment 1

[0042] Zinc oxide soot, a by-product of lead smelting in a factory, material composition (%): Zn 42.43, Pb 12.54, Cu 0.04, Cd 0.58, In 0.0226, S 2.8, Cl 0.16, F 0.025, As 0.36, Sb 0.048.

[0043] Newly configured NH 4 Cl-NH 3 The solution is a leaching agent, containing Zn 2+ 0g / L, NH 4 Cl 5.0mol / L, NH 3 3.0mol / L, the solid-liquid ratio is 250g / L, zinc is leached from sub-zinc oxide soot at room temperature, the leaching time is 2.5h, and the leaching rate of zinc during the leaching process is 90.78%.

[0044] Leaching solution composition (g / L): Zn 2+ 96.29, Cu 2+ 0.09, Ni 2+ 0.18, Cd 2+ 1.35, Pb 2+ 0.058. The theoretical consumption of zinc powder is 110g / L, two-stage countercurrent purification at room temperature, adding 3 times the theoretical consumption of zinc powder to replace Cu, Cd, Ni, Co, Pb, etc.

[0045] The resulting Zn(II)-NH 3 -NH 4 Cl solution, neutralize the NH in the solution with 35% hydrochloric acid 3 , control the molar ratio of ammonia a...

Embodiment 2

[0047] Sub-zinc oxide soot obtained by volatilization of low-grade zinc oxide ore in a factory, material composition (%): Zn 68.25, Pb 2.14, Cu 0.14, Cd 1.26, In 0.0699, S 0.34, Cl 0.08, F 0.052, As 0.24, Sb 0.068 .

[0048] Containing Zn 2+ 15g / L, NH 4 Cl 5.5mol / L, NH 3 The 3.0mol / L solution is used as the leaching agent, and the solid-to-liquid ratio is 150g / L. Zinc is leached from sub-zinc oxide soot at room temperature, and the leaching time is 1.5h. The leaching rate of zinc during the leaching process is 98.27%.

[0049] Leaching solution composition (g / L): Zn 2+ 115.21, Cu 2+ 0.21, Ni 2+ 0.09, Co 2+ 0.007, Cd 2+ 1.96, Pb 2+ 0.064. use. The theoretical consumption of zinc powder is 1.48g / L, two-stage countercurrent purification at room temperature, adding zinc powder twice the theoretical consumption to replace Cu, Cd, Ni, Co, Pb, etc.

[0050] The resulting Zn(II)-NH 3 -NH 4 Cl solution, neutralize the NH in the solution with hydrochloric acid 3 , control ...

Embodiment 3

[0053] Zinc oxide ash produced by a recycling smelter, material composition (%): Zn 74.43, Pb 0.0032, Cu 0.0004, Cd 0.0002, Cl 6.56.

[0054] Containing Zn 2+ 10g / L, NH 4 Cl 4.5mol / L, NH 3 The solution of 3.0mol / L is the leaching agent, and the solid-liquid ratio is 100g / L. Zinc is leached from zinc ash at room temperature, and the leaching time is 0.5h. The leaching rate of zinc during the leaching process is 93.43%. state exists.

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Abstract

The invention discloses a method for producing high-purity anhydrous zinc chloride. The method comprises the following steps of: leaching zinc from a zinc oxide-containing material at normal temperature by adopting ammonia-ammonium chloride solution, and removing impurities from the leachate by adopting two-section reflux zinc powder displacement; neutralizing NH3 in the obtained Zn (II)-NH3-NH4Cl solution by using HCl to settle Zn(NH3)2Cl2; and calcining the dried Zn(NH3)2Cl2 at the temperature of between 300 and 550 DEG C to obtain a high-purity anhydrous ZnCl2 product, wherein the NH3 enters the tail gas, and the settled mother solution containing Zn<2+>, NH4Cl and NH3 is used for absorbing the NH3 tail gas generated in the calcining process and returned to next leaching after being prepared. The method is energy-saving, environment-friendly, simple and convenient in operation and good in purifying effect; the product has high purity and high yield; and the method is suitable for industrialized promotion.

Description

technical field [0001] The invention discloses a new process for producing high-purity anhydrous zinc chloride through purification, neutralization and precipitation, drying and thermal decomposition by using ammonia-ammonium chloride solution to leaching materials containing zinc oxide. It belongs to secondary resource recovery and zinc The field of production of chemical products. Background technique [0002] Zinc chloride products are mainly used in zinc-manganese batteries, electroplating and other fields, and there are strict requirements on the purity of zinc chloride products. [0003] At present, the production of zinc chloride products at home and abroad is mainly produced by the hydrochloric acid aqueous solution method, and its main process includes hydrochloric acid leaching, purification, drying, and packaging. The improvement of the existing zinc chloride process reported in domestic and foreign literature mainly focuses on improving the adaptability of raw m...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/14C22B3/44
CPCY02P10/20
Inventor 杨声海邓小林陈永明邹美捷
Owner 新干县金山化工厂
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