Technical method for producing feed-grade zinc sulfate in environment-friendly manner by electrolytic zinc slag

A process method and technology for electrolysis of zinc, applied in directions such as zinc sulfate, can solve the problems of high energy consumption, high raw material cost, unenvironmental production process, etc., and achieve the effects of low energy consumption, high solution cost, and simple production process flow.

Active Publication Date: 2015-04-29
湖南鑫科思生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a process for producing feed grade zinc sulfate in an environmentally friendly way using electrolytic zinc waste slag, aiming at the problems of high raw material cost, unenvironmental protection and high energy consumption in the current preparation method of feed grade zinc sulfate.

Method used

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  • Technical method for producing feed-grade zinc sulfate in environment-friendly manner by electrolytic zinc slag
  • Technical method for producing feed-grade zinc sulfate in environment-friendly manner by electrolytic zinc slag
  • Technical method for producing feed-grade zinc sulfate in environment-friendly manner by electrolytic zinc slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Select the electrolytic zinc waste residue as shown in Table 1, add it and water into the primary reaction tank at a mass ratio of 1:3, stir at a speed of 90r / min, and inject steam into the material to make the material The temperature was heated to 80°C, and the temperature was kept and stirred for 1.5 hours, and the pH of the obtained solution was 1.5;

[0030] (2) Add saturated lime milk supernatant dropwise to the primary reaction tank, adjust the pH of the solution to 5.0, continue to stir for 30 minutes, and age for 15 minutes;

[0031] (3) Use a vacuum pump to pump out the materials in the primary reaction tank, and use a plate and frame filter press to separate the solid from the liquid. The resulting filter residue is washed with water and treated as solid calcium iron slag to the brick factory, and the filtrate enters the next channel process, washing water is reused as water for dissolving electrolytic zinc waste residue;

[0032] (4) Pump the filtrate i...

Embodiment 2

[0040] (1) Select the electrolytic zinc waste residue as shown in Table 1, add it and water into the primary reaction tank at a mass ratio of 1:4, stir at a speed of 70r / min, and inject steam into the material to make the material The temperature was heated to 70°C, and the temperature was kept and stirred for 2 hours, and the pH of the obtained solution was 2.0;

[0041] (2) Add saturated lime milk supernatant dropwise to the primary reaction tank, adjust the pH of the solution to 5.1, continue to stir for 1 hour, and age for 30 minutes;

[0042] (3) Use a vacuum pump to pump out the materials in the primary reaction tank, and use a plate and frame filter press to separate the solid from the liquid. The resulting filter residue is washed with water and treated as solid calcium iron slag to the brick factory, and the filtrate enters the next channel process, washing water is reused as water for dissolving electrolytic zinc waste residue;

[0043] (4) Pump the filtrate into th...

Embodiment 3

[0051] (1) Select the electrolytic zinc waste residue as shown in Table 1, add it and water to the primary reaction tank at a mass ratio of 1:2, stir at a speed of 80r / min, and inject steam into the material to make the material The temperature was heated to 60°C, and the temperature was kept and stirred for 1.7 hours, and the pH of the obtained solution was 1.5;

[0052] (2) Add saturated lime milk supernatant dropwise to the primary reaction tank, adjust the pH of the solution to 4.5, continue to stir for 0.6 hours, and age for 20 minutes;

[0053] (3) Use a vacuum pump to pump out the materials in the primary reaction tank, and use a plate and frame filter press to separate the solid from the liquid. The resulting filter residue is washed with water and treated as solid calcium iron slag to the brick factory, and the filtrate enters the next channel process, washing water is reused as water for dissolving electrolytic zinc waste residue;

[0054] (4) Pump the filtrate into...

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Abstract

The invention discloses a technical method for producing feed-grade zinc sulfate in an environment-friendly manner by electrolytic zinc slag. The technical method comprises the steps: stirring to dissolve the electrolytic zinc slag by hot water at the temperature of 60-80 DEG C, adjusting the pH of a solution to be 4.5-5.1 by saturated lime whey liquid, filtering out and removing part of sediments, heating filtrate to 80-90 DEG C, feeding air or oxygen to remove most of iron impurities, adding a small amount of calcium powder or second zinc oxide powder into the solution to remove trace iron impurities in the solution, adding metal zinc powder into the filtrate after filtering under the condition that the pH is 4.2-4.5 to further remove the residual heavy metal impurities, adding active carbon powder and a chelating agent into the solution to remove a small quantity of organic impurities from the solution, concentrating and crystallizing a pure zinc sulfate solution to prepare a feed-grade heptahydrate or zinc sulphate monohydrate product after filtering. According to the method, the electrolytic zinc slag is used as a raw material; due to full-closed-loop cyclic production, the method is environment-friendly, low in production cost and high in economic benefit.

Description

technical field [0001] The invention relates to the technical field of zinc sulfate refining, in particular to a process method for environmentally friendly production of feed-grade zinc sulfate by using electrolytic zinc waste residue. Background technique [0002] The currently used feed additive zinc sulfate is mainly obtained by three preparation methods: the first method is to use metal zinc powder as raw material, and obtain it through sulfuric acid leaching, filtration, impurity removal, purification, and concentrated crystallization; the second method Zinc oxide is used as raw material, obtained through sulfuric acid leaching, filtration, impurity removal, purification, and concentrated crystallization; the third method is to obtain zinc ore through flotation enrichment, oxidation roasting, and then leaching with sulfuric acid. The above three preparation methods all have mature process schemes, but there are still the following problems: 1. Most of the existing proc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/06
CPCC01G9/06C01P2006/80
Inventor 袁福堂
Owner 湖南鑫科思生物科技有限公司
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