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Method for removing lead in cupper sulfate preparation process

A preparation process, copper sulfate technology, applied in copper sulfate and other directions, can solve the problems of difficulty in meeting feed, many processes, low removal rate, etc., and achieves deep lead removal. Effect

Active Publication Date: 2012-08-22
苏州长湖纳米科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to meet the requirements of the feed industry standards, and deep lead removal must be carried out to meet the standard requirements
[0003] The commonly used lead removal methods include chemical precipitation, solvent extraction, ion exchange, adsorption co-precipitation, recrystallization, etc., and the above methods have certain defects in removing trace amounts of lead in the copper sulfate preparation system, or the removal rate Low, or large investment, many processes, low efficiency, large amount of wastewater, or the introduction of new impurities, etc.
It is difficult to meet the requirements of fierce market competition or the macro policy of energy saving and emission reduction
[0004] At present, there is no patent specifically aimed at removing trace lead in products when preparing copper sulfate, and there are few literatures about deep lead removal when preparing copper sulfate

Method used

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  • Method for removing lead in cupper sulfate preparation process
  • Method for removing lead in cupper sulfate preparation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Pump 1500L of the same high-lead copper hydroxide slurry prepared from PCB etching waste liquid into two 2000L reactors A and B respectively for use.

[0033] While stirring, only add 1KG ammonium acetate into reactor A, then add sulfuric acid into reactors A and B to raise the temperature, cool and crystallize, separate and dehydrate to obtain copper sulfate products A and B. The results of lead detection in products are shown in Table 1.

[0034] project

[0035] Table 1

Embodiment 2

[0037] Pump 1500L of the same high-lead copper hydroxide slurry prepared from PCB etching waste liquid into two 2000L reactors A and B respectively for use.

[0038] While stirring, only add 5KG sodium acetate to reactor A, then add sulfuric acid to both reactors A and B to raise the temperature, cool and crystallize, separate and dehydrate to obtain A and B copper sulfate products. The results of the detection of lead in the product are shown in Table 2.

[0039] project

[0040] Table 2

Embodiment 3

[0042] Into two 2000L reactors A and B, respectively, pump 1800L of low-concentration copper sulfate solution containing excessive lead, prepared from copper ore or scrap copper, for use.

[0043] While stirring, only add 10KG copper acetate to reactor A, then heat, concentrate and crystallize the two reactors A and B respectively, and obtain A and B copper sulfate products after separation and dehydration. The results of the detection of lead in the product are shown in Table 3.

[0044] project

[0045] table 3

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PUM

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Abstract

The invention discloses a method for removing lead in a cupper sulfate preparation process. The method is characterized by comprising the following steps: a, preparing a lead-dissolving reagent by utilizing acetic acid or one or more water-soluble acetates, wherein the molar weight of acetate in the lead-dissolving reagent is 2 times larger than that of lead in a cupper sulfate preparation solution to be treated; b, adding the lead-dissolving reagent into the lead-containing cupper sulfate preparation solution to be treated so that acetate in the lead-dissolving reagent and lead form soluble lead acetate; c, crystallizing and precipitating out cupper sulfate in the cupper sulfate preparation solution; and d, separating cupper sulfate crystal obtained by crystallization and precipitation from the treated cupper sulfate preparation solution. The method disclosed by the invention has the beneficial effects that the lead-removing process is wide in application range, the lead-removing cost is low, a deep lead-removing effect is good, the quality is stable, the efficiency is high, and equipment dose not need to be added and changed.

Description

technical field [0001] The invention relates to a method for removing impurities in the chemical industry, in particular to a method for removing lead in the copper sulfate preparation process. Background technique [0002] As a feed additive, copper sulfate has strict requirements on heavy metal lead. The HG 2932-1999 copper sulfate feed grade standard issued by the state requires that the lead (Pb) content be less than 10ppm. At present, most of the main preparation routes of copper sulfate in our country use electronic waste liquid, copper ore and copper waste, and the lead content in the prepared copper sulfate reaches dozens or even hundreds of ppm. It is difficult to meet the requirements of the feed industry standards, and deep lead removal must be carried out to meet the standard requirements. [0003] The commonly used lead removal methods include chemical precipitation, solvent extraction, ion exchange, adsorption co-precipitation, recrystallization, etc., and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G3/10
Inventor 廖勇志
Owner 苏州长湖纳米科技有限公司
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