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A method for comprehensively recovering various elements of chemical waste sulfuric acid and waste hydrochloric acid combined treatment of laterite nickel ore

A technology of laterite nickel ore and waste sulfuric acid, which is applied to the comprehensive utilization of waste sulfuric acid, low-concentration waste hydrochloric acid, and step-by-step extraction of various elements in laterite nickel ore. The effect of simplicity, small production scale and low production cost

Active Publication Date: 2015-08-19
江苏仁欣环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the shortcomings of the existing laterite nickel ore wet treatment, such as high cost and incapable of comprehensive utilization, the present invention provides a chemical industry with small investment, simple process, low energy consumption, low production cost, comprehensive recovery of various elements, and high recovery rate of nickel and cobalt. Method for Comprehensive Recovery of Various Elements in Combined Treatment of Laterite Nickel Ore with Waste Sulfuric Acid and Waste Hydrochloric Acid

Method used

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  • A method for comprehensively recovering various elements of chemical waste sulfuric acid and waste hydrochloric acid combined treatment of laterite nickel ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Stirring and leaching with hydrochloric acid

[0030] at 12m 3 Put into the mixing tank after preparation of laterite nickel ore ore - 0.15mm (less than 0.15mm) pulp 5t. Its chemical composition is shown in the table below.

[0031] -0.15mm pulp chemical composition

[0032] weight t

Concentration %

containing dry ore

Ni%

Fe%

Mg%

SiO 2 %

5

30

1.5

1.6

18

8.0

40

[0033] Add 4.5t of waste hydrochloric acid with a mass fraction of 20% HCl, heat to a temperature of 80°C, stir and leaching for 3 hours at ℃, and the leaching is completed. 2 Filter with a plate and frame filter press, add 0.75t of water to the filter press and wash the filter residue directly, and combine the filtrate and washing water. Obtain leaching residue, hydrochloric acid leaching solution, its chemical composition is as follows.

[0034] Chemical composition of leaching residue

[0035] wet weight

dry weight ...

Embodiment 2

[0086] 1. Stirring and leaching with hydrochloric acid

[0087] at 2m 3 1t of laterite nickel ore preparation - 0.15mm slurry is put into the stirring tank. Its chemical composition is shown in the table below.

[0088] -0.15mm pulp chemical composition

[0089] weight t

Concentration %

containing dry ore

Ni%

Fe%

Mg%

SiO 2 %

1

30

0.3

1.4

18

7.6

41

[0090] Add 0.9t of waste hydrochloric acid with a mass fraction of 20% HCl, heat to a temperature of 70°C, stir and leaching for 6 hours, the leaching is complete, and use a filter area of ​​10m 2 Filter with a plate and frame filter press, add 0.15t of water to the filter press and wash the filter residue directly, and combine the filtrate and washing water. Obtain leaching residue, hydrochloric acid leaching solution, its chemical composition is as follows.

[0091] Chemical composition of leaching residue

[0092] wet weight

dry weight

...

Embodiment 3

[0143] 1. Stirring and leaching with hydrochloric acid

[0144] at 3m 3 1t of laterite nickel ore preparation - 0.15mm slurry is put into the stirring tank. Its chemical composition is shown in the table below.

[0145] -0.15mm pulp chemical composition

[0146] weight t

Concentration %

containing dry ore

Ni%

Fe%

Mg%

SiO 2 %

1

30

0.3

1.7

20

6.0

41

[0147] Add 1.8t of waste hydrochloric acid with a HCl mass fraction of 10%, heat to a temperature of 75°C, stir and leaching for 4.5h, the leaching is complete, and use a filter area of ​​10m 2 Filter with a plate and frame filter press, add 0.15t of water to the filter press and wash the filter residue directly, and combine the filtrate and washing water. Obtain leaching residue, hydrochloric acid leaching solution, its chemical composition is as follows.

[0148] Chemical composition of leaching residue

[0149] wet weight

dry weight

M...

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Abstract

The invention discloses a method for comprehensive reclaiming elements by treating laterite-nickel ore by combination of chemical waste sulfuric acid and waste hydrochloric acid. The method comprises the following steps: stirring and extracting the prepared laterite-nickel ore with granularity of less than 0.15mm in a solid-liquid ratio that waste hydrochloric acid to minerals is (3-5):1; neutralizing extract with calcium carbonate or lime to remove iron, and precipitating nickel with lime; precipitating magnesium by adding lime after nickel is precipitated to obtain magnesium hydroxide, evaporating and crystallizing the liquid after magnesium is precipitated to produce calcium chloride dehydrate; soaking the prepared laterite-nickel ore of 2-10mm in a liquid-solid ratio of 0.5:1 for multiple times in a countercurrent manner, and neutralizing the extract with magnesium hydroxide to remove iron, and precipitating magnesium with sodium hydroxide; evaporating and crystallizing the solution after nickel is precipitated to produce magnesium sulfate heptahydrate. The process is adjustable in production scale, wide in resource utilization, simple in process flow, small in investment and low in energy consumption, can be used for comprehensively reclaiming elements, does not pollute the environment, has the advantages of high nickel reclaiming rate, simple operation and low production cost, and provides an extremely effective and economical way to effective utilization of waste sulfuric acid and waste hydrochloric acid and comprehensive reclaiming of laterite-nickel ore.

Description

technical field [0001] The invention relates to a method for comprehensively recovering various elements of laterite nickel ore by combining chemical waste sulfuric acid and waste hydrochloric acid, especially the comprehensive utilization of low-concentration waste hydrochloric acid and waste sulfuric acid, and the method for step-by-step extraction of various elements in laterite nickel ore. The field of recycling. Background technique [0002] The wet treatment of laterite nickel ore adopts industrial hydrochloric acid, which has a fast leaching speed, high leaching rate, and low cost of nickel precipitation, but the price of hydrochloric acid is relatively high, which is uneconomical. Using industrial sulfuric acid leaching, the leaching rate is high, but the cost of nickel precipitation in the later stage is high and uneconomical. Therefore, how to treat laterite nickel ore in a low-cost way and fully and comprehensively utilize the limited waste sulfuric acid and hydr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/08C22B3/10C22B3/44C22B23/00C21B15/00
CPCY02W30/54Y02P10/20
Inventor 钱光友江山
Owner 江苏仁欣环保科技有限公司
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