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Method for recycling heavy metal pollution wastes

A recycling method and waste technology, which is applied in the field of harmless resource recycling, can solve the problem of no separation and recycling of various heavy metals, and achieve the effect of wide process adaptability

Inactive Publication Date: 2010-10-27
青川县天运金属开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, there has not been a process suitable for separating and recovering various heavy metals from processing waste containing various non-ferrous metals through a set of processes

Method used

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  • Method for recycling heavy metal pollution wastes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] One embodiment comprises the following steps: 1) Raw material pulping: 1 ton of solid bulk raw material is crushed and crushed and put into the pulping tank, and 3 tons of water is added to make slurry (if it is muddy raw material or waste liquid, it can be directly put into the pulping tank ). 2) Acid leaching and dissolving: concentrated sulfuric acid (concentration is 98%) in the sulfuric acid reaction tank is slowly dripped into water from the top and diluted to dilute sulfuric acid with a concentration of 20% to 30%. The reaction tank is equipped with a mechanical stirrer, and the temperature is controlled below 30°C by controlling the stirring speed and the dripping speed of concentrated sulfuric acid. The prepared dilute sulfuric acid flows into the reaction tank containing the mixed liquid product of step 1 by using the drop, and the pH value is adjusted to 1.0-2.5 , the compounds of nickel, cobalt, copper, zinc, chromium, and cadmium in the raw materials are di...

Embodiment 2

[0054] Steps 1 to 5 are the same as in Example 1, and the following steps are added after step 5: a) extraction: the filtrate of step 5 is sent to the extraction system, separated by P204 and P507; b) producing nickel and cobalt powder: extracting Add 1.4 tons of sodium carbonate liquid with a concentration of 7%-10% to the raffinate, adjust the pH value to 7.8-9.0, press filter to obtain nickel carbonate, dry and heat at 600-800°C for reduction, the optimal reducing agent is starch or Materials with reducing properties of carbon and hydrogen, after washing, melt and cast to obtain 0.05 tons of nickel ingots; the extract obtained in the extraction step is subjected to back extraction to obtain cobalt liquid and zinc liquid, and the cobalt liquid is added with a concentration of 10% to 15% sodium hydroxide Precipitate the liquid, adjust the pH value to 7.8-8.5, press filter and wash to obtain cobaltous hydroxide, dry and calcinate to obtain 0.03 tons of cobalt powder; the filtra...

Embodiment 3

[0056] Repeat the same steps in Example 2, and increase the following steps on the basis of Example 2: the gained zinc solution is added with a concentration of 10% to 15% sodium hydroxide liquid to adjust the pH to 7.0-7.8, and it is washed by pressure filtration to obtain hydrogen oxide Zinc, 0.25 tons of zinc sulfate is obtained after acidification treatment; the filtrate is recycled.

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Abstract

The invention discloses a method for recycling heavy metal pollution wastes, which comprises the following steps of: 1) the pulping of raw materials; 2) acid leaching, namely, adding pulp obtained in the step 1 into a dilute sulphuric acid for filtration, and taking filter residues as the raw materials of bricks or cement; 3) copper displacement, namely, displacing copper out of filtrate in the step 2 with iron; 4) the preparation of ferrum-chrome-alum, namely, adding alkaline substances and an oxidant into the filtrate obtained in the step 3, adjusting a PH value, and precipitating and filter-pressing the mixed solution to obtain the ferrum-chrome-alum; and 5) the preparation of sponge cadmium, namely, displacing cadmium out of the filtrate obtained in the step 4 with zinc. The process has the advantages of suitability for the treatment of waste residues and waste liquor in a plurality of industries of electroplating, surface treatment, heavy metal smelting, chemical engineering and the like, no need of heating liquid-phase materials, the realization of closed cycle, and the capacity of extracting a plurality of valuable metals, such as Cu, Cr, Cd, Ni, Co, Zn and the like, directly taking the wastes obtained after the metal separation as the raw materials of the bricks or cement, and saving coal and electricity amounting to 20,000 T standard coal and 40,000-ton water per year for enterprises recycling 5,000-ton metals per year.

Description

technical field [0001] The present invention relates to a method for harmless recycling of heavy metal-polluted waste, in particular to a method for separating and recovering Cu, Cr, Cd, Ni, Co, and Zn from non-ferrous metal processing waste by using hydrometallurgy technology . Background technique [0002] The existing non-ferrous metal hazardous waste treatment technologies include solidification landfill, throwing into the sea, incineration and other technologies. These technologies have disadvantages such as occupying cultivated land, wasting resources, high cost, and potential long-term secondary environmental pollution. [0003] The harmless resource treatment technology of non-ferrous metal hazardous waste has always been the focus of research at home and abroad. There are two types of fire technology and wet technology in the prior art. The former costs more. The main process steps of the existing wet technology include: leaching-solid-liquid separation-purificat...

Claims

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Application Information

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IPC IPC(8): C22B3/08C22B3/44C22B3/46C22B7/00C22B15/00C22B17/00C22B34/22C22B34/32C22B23/00
CPCY02P10/20
Inventor 王修海
Owner 青川县天运金属开发有限公司
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