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Two-stage type nickel precipitation method

A two-stage, nickel-precipitating technology, applied in the direction of improving process efficiency, can solve the problems of harsh operating conditions, loss of precipitant, high equipment investment, etc., and achieve the effect of low production cost, fast precipitation speed and low investment

Inactive Publication Date: 2011-05-18
广西银亿新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]However, the traditional use of metal sulfides as sulfide precipitants has the following disadvantages: hydrogen sulfide, sodium sulfide, etc. Harsh conditions and high equipment investment are not conducive to production; sulfide precipitation is greatly affected by acidity, and the precipitant Na2S·9H2O has the following ionization in aqueous solution Reaction: Na2S ?2Na+ + S2-, in acidic solution S2- will also The reaction generates H2S gas: S2- + H+ ?HS-, HS- + H+ ?H2S, which will not only lead to the loss of precipitant, make the precipitation incomplete, but also cause pollution to the environment
However, when the nickel ions are completely precipitated, some magnesium ions will be precipitated at the same time, so after nickel precipitation with sodium hydroxide, the magnesium content in the precipitate is relatively high, and subsequent treatment is troublesome.

Method used

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Effect test

Embodiment 1

[0023] The lateritic nickel ore leach solution contains 3.43g / l nickel and 30.28 g / l magnesium. Add 40g / l sodium hydroxide aqueous solution, adjust the pH value to 7.5, the temperature is 80 degrees Celsius, react for 3 hours, and carry out liquid-solid separation. The obtained precipitate contains 0.12% magnesium and 50% nickel, and the separated solution contains 0.343g / l nickel and 30.26g / l magnesium. The solution obtained by separation continues to increase the pH value to 9.0 with 40 g / l aqueous sodium hydroxide solution, and the temperature is 80 degrees Celsius. After reacting for 3 hours, liquid-solid separation is carried out, and the precipitate contains 35.91% of nickel and 6.92% of magnesium. The separated solution contains Nickel 0.0099g / l, magnesium 30.20g / l.

Embodiment 2

[0025] The lateritic nickel ore leachate contains 2.9g / l nickel and 25.09g / l magnesium. Add 45g / l sodium hydroxide aqueous solution, adjust the pH value to 8.15, the temperature is 50 degrees Celsius, react for 1.5 hours, and carry out liquid-solid separation. The obtained precipitate contains 0.43% of magnesium and 47.45% of nickel, and the separated solution contains 0.29g / l of nickel and 25.07g / l of magnesium. The solution that separates obtains continues to raise pH value with the sodium hydroxide aqueous solution of 40g / l, and temperature is 50 degrees centigrade, reacts for 0.5 hour, carries out liquid-solid separation, obtains precipitation and contains nickel 36.5%, contains magnesium 7.48%, separates and obtains solution containing Nickel 0.0082g / l, magnesium 24.65g / l.

Embodiment 3

[0027] The laterite nickel ore leaching solution contains nickel concentration of 1.95g / l and magnesium content of 19.74 g / l. Add 50g / l sodium hydroxide aqueous solution, adjust the pH value to 8.5, the temperature is 20 degrees centigrade, react for 0.5 hour, and carry out liquid-solid separation. The obtained precipitate contains 0.95% of magnesium and 45.88% of nickel, and the separated solution contains 0.195g / l of nickel and 19.73g / l of magnesium. The solution obtained by separating continues to raise the pH value to 9.3 with the sodium hydroxide aqueous solution of 40g / l, 20 degrees Celsius of temperature, reacts 2 hours, carries out liquid-solid separation, obtains precipitation and contains nickel 38.1%, contains magnesium 7.62%, separates and obtains The solution contains 0.0076g / l nickel and 19.70g / l magnesium.

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Abstract

The invention discloses a two-stage type nickel precipitation method. The method comprises the following steps of: (1) primary nickel precipitation: adding a NaOH solution to a nickel sulfate solution containing magnesium, regulating a pH value to be 7.5-8.5 and reacting at a temperature of 20-80 DEG C for 0.5-3 h; (2) separating precipitates obtained in the step (1) from a nickel precipitation mother liquid; (3) secondary nickel precipitation: adding a NaOH solution to the nickel precipitation mother liquid obtained in the step (2), regulating the pH value to 9-10 and reacting at a temperature of 20-80 DEG C for 0.5-3 h; (4) separating precipitates obtained in the step (3) from the nickel precipitation mother liquid and returning precipitates obtained in the step (4) by separation to a system of an agitation and leaching procedure to be cycled. Nickel hydroxide products containing more than 45% of nickel can be precipitated with the two-stage type nickel precipitation method, and the nickel precipitation rate can reach more than 99%.

Description

technical field [0001] The invention relates to a method for producing metallic nickel and nickel salt by a sulfuric acid leaching method, in particular to a method for separating nickel and magnesium from nickel sulfate solution by precipitation of nickel. Background technique [0002] Atmospheric pressure acid leaching process of laterite nickel ore is a popular research direction of laterite nickel ore treatment technology. The existing normal-pressure acid leaching process for treating laterite nickel ore is as follows: the laterite nickel ore is first crushed and ore-grinded, and the finely ground pulp and sulfuric acid are reacted under heating conditions in a certain proportion, and the ore in the ore is Nickel metal is leached into the solution, and some metals such as magnesium and manganese are also leached into the solution at the same time. The leachate is separated from liquid to solid by a filter. The filtrate is subjected to nickel precipitation with a preci...

Claims

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Application Information

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IPC IPC(8): C22B3/46C22B23/00
CPCY02P10/20
Inventor 肖万林王多冬王亚秦和润秀李海燕容仕甲
Owner 广西银亿新材料有限公司
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