Method for separating and reclaiming metal nickel and tin from waste materials containing nickel and tin

A separation and recycling, waste technology, applied in the direction of improving process efficiency, to achieve the effect of wide application, high added value and low energy consumption

Inactive Publication Date: 2010-09-08
GUANGDONG BRUNP RECYCLING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In my country, there are few relevant technical reports on the separation a

Method used

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  • Method for separating and reclaiming metal nickel and tin from waste materials containing nickel and tin
  • Method for separating and reclaiming metal nickel and tin from waste materials containing nickel and tin
  • Method for separating and reclaiming metal nickel and tin from waste materials containing nickel and tin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Get 10 grams of waste alloy materials containing nickel and tin, add excessive sulfuric acid and nitric acid to dissolve, and analyze the main components as follows:

[0021]

[0022] In order to fully improve the utilization rate of the acid and facilitate the adjustment of the pH value of the final leaching solution, the present invention uses two-stage acid leaching. The first stage of acid leaching process: prepare a mixed acid of 1mol / L sulfuric acid and 4mol / L nitric acid, take 20L of acid and 2Kg nickel-tin scrap alloy material, and add it to the reactor with a liquid-solid ratio of 10:1. The reaction temperature was 80° C., mechanically stirred, and filtered after a reaction time of 10 hours. The composition analysis of the obtained solution was as follows.

[0023]

[0024] The second stage of acid leaching process: the remaining hydrogen ions in the first stage of the leaching solution reach about 1mol / L, and nickel-tin scrap alloy materials need to be u...

Embodiment 2

[0027] Prepare sodium carbonate solution 2mol / L, transfer the 20L leachate obtained in Example 1 into a clean reactor, the reaction temperature is 80°C, and accompanied by mechanical stirring, use 2mol / L sodium carbonate solution to neutralize, the sodium carbonate solution speed Follow the method of first fast and then slow, when the speed of bubble disappearing slows down, reduce the liquid addition speed to 20ml / min, adjust the pH value of the solution to 4.5, settle for 8 hours, and filter. At this time, tin and iron enter the slag as hydroxides, and most of the nickel remains in the filtrate. The obtained nickel-containing solution is about 35L, which is used for extraction and removal of impurities, and its composition is shown in the following table. The recovery rate of nickel in this process is 98.2%.

[0028]

Embodiment 3

[0030] The tin-iron filter residue that obtains in the example 2 is transferred in the clean reactor, adds enough 20% sodium hydroxide solution, and the control reaction temperature is 90 ℃ and with mechanical stirring, reacts for 6 hours, and the pH value of the whole process is always equal to or higher than 14. The original yellow color of the filter residue gradually changed to reddish brown, the tin was fully dissolved, and the iron impurities still existed in the form of slag. Solid-liquid separation, removal of iron slag, to obtain pure sodium stannate solution. The sodium stannate solution is concentrated and crystallized, and the prepared sodium stannate product meets the GB / T 23278-2009 standard. Sodium stannate crystals are re-dissolved with ammonia water at pH = 13.5 and temperature is 60°C, and then recrystallized to prepare ammonium stannate crystals; decompose the ammonium stannate crystals at 450°C for 3 hours to obtain porous tin dioxide Powder material.

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Abstract

The invention discloses a method for separating and reclaiming metal nickel and tin from waste materials containing nickel and tin. The method is characterized by comprising the following steps of: leaching the waste materials containing the nickel and tin with acid; adjusting pH value of the materials by using an alkali substance to ensure that impurity iron and a valuable component tin are precipitated; filtering the solution to obtain nickel-containing solution and tin-containing precipitate; extracting the nickel-containing solution for impurity removal and purification, wherein purifying fluid can be directly crystallized to prepare nickel sulfate, can be precipitated and degraded to prepare nickel hydroxide, nickel carbonate and nickel oxalate powder materials, and can be further degraded or reduced to prepare nickel oxide powder and metal nickel powder; and adding sodium hydroxide solution into the tin-containing precipitate, dissolving the tin out and allowing the tin to enter the solution, recrystallizing the solution to prepare a sodium stannate product, or further crystallizing and degrading the solution to prepare a tin dioxide powder material. Acid and alkali in low price are consumables in the whole reclaiming process, and product variousness is provided, so the method has significant economic value and market competitiveness.

Description

Technical field: [0001] The invention belongs to the technical field of resource regeneration, and more specifically relates to a method for separating and recovering nickel and tin from waste materials containing nickel and tin. technical background: [0002] With the rapid development of China's stainless steel industry and secondary battery industry, China's nickel consumption increased by 10 times from 1995 to 2005. It is estimated that China's nickel consumption will reach more than 400,000 tons per year in 2010, becoming the world's largest nickel consumer. At present, China's basic reserves of nickel metal are only about 2.3 million tons, and the resources are very limited. It has become an important strategic metal. Today's nickel supply in my country consists of two parts, one part is the supply of newly produced nickel concentrate, which accounts for 72.9% of the total nickel supply, and the other part comes from recycled nickel, which only accounts for 27.1% of t...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/06C22B23/00C22B25/00
CPCY02P10/20
Inventor 李长东廖折军黄国勇唐红辉
Owner GUANGDONG BRUNP RECYCLING TECH
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