A process of producing a snow melting agent from waste liquids obtained by subjecting laterite nickel ore to leaching with sulfuric acid and hydrochloric acid and to nickel precipitation

A technology of laterite nickel ore and sulfuric acid hydrochloric acid, applied in calcium/strontium/barium sulfate, chemical instruments and methods, magnesium chloride, etc., can solve the problems of high salt concentration in water, no market value, and difficult separation of mixed salts, etc. The effect of simple path, small investment and low production cost

Active Publication Date: 2014-06-04
江苏仁欣化工股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Direct discharge will cause high salt concentration in the water body
Calcium chloride hexahydrate (CaCl) obtained by direct evaporation and crystallization 2 ·6H 2 O), magnesium chloride hexahydrate (MgCl 2 ·6H 2 O), the mixed salt is not easy to separate and has no market value

Method used

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  • A process of producing a snow melting agent from waste liquids obtained by subjecting laterite nickel ore to leaching with sulfuric acid and hydrochloric acid and to nickel precipitation
  • A process of producing a snow melting agent from waste liquids obtained by subjecting laterite nickel ore to leaching with sulfuric acid and hydrochloric acid and to nickel precipitation
  • A process of producing a snow melting agent from waste liquids obtained by subjecting laterite nickel ore to leaching with sulfuric acid and hydrochloric acid and to nickel precipitation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Hydrochloric acid leaching of laterite nickel ore, iron removal with calcium carbonate, waste liquid containing calcium chloride and magnesium chloride after lime nickel precipitation and sulfuric acid leaching of laterite nickel ore, iron removal with calcium carbonate, sodium sulfate and magnesium sulfate after nickel precipitation with sodium hydroxide Waste liquid, its chemical composition is as follows:

[0018]

[0019] at 20m 3 Add 10m of waste liquid containing calcium chloride and magnesium chloride to the stirring tank 3 , add 4.94m of waste liquid containing sodium sulfate and magnesium sulfate 3 , 30°C, stirred for 30 minutes, a white calcium sulfate precipitate was generated, and the calcium precipitated material was obtained.

[0020] Filter the material after calcium precipitation with a filter area of ​​160m 2 Filtration by chamber filter press, the filter cakes are all flushed on the filter press for 2.3m 3 Wash, combine the filtrate and wash wat...

Embodiment 2

[0029] Hydrochloric acid leaching of laterite nickel ore, iron removal with calcium carbonate, waste liquid containing calcium chloride and magnesium chloride after lime nickel precipitation and sulfuric acid leaching of laterite nickel ore, iron removal with calcium carbonate, sodium sulfate and magnesium sulfate after nickel precipitation with sodium hydroxide Waste liquid, its chemical composition is as follows:

[0030]

[0031] at 20m 3 Add 10m of waste liquid containing calcium chloride and magnesium chloride to the stirring tank 3 , add 4.87m of waste liquid containing sodium sulfate and magnesium sulfate 3 , 5°C, stirred for 2 hours, a white calcium sulfate precipitate was generated, and the calcium precipitated material was obtained.

[0032] Filter the material after calcium precipitation with a filter area of ​​160m 2 Filtration by chamber filter press, the filter cakes are all flushed on the filter press for 2.3m 3 Wash, combine the filtrate and wash water. ...

Embodiment 3

[0042] Hydrochloric acid leaching of laterite nickel ore, iron removal with calcium carbonate, waste liquid containing calcium chloride and magnesium chloride after lime nickel precipitation and sulfuric acid leaching of laterite nickel ore, iron removal with calcium carbonate, sodium sulfate and magnesium sulfate after nickel precipitation with sodium hydroxide Waste liquid, its chemical composition is as follows:

[0043]

[0044] at 2m 3 Add 1m of waste liquid containing calcium chloride and magnesium chloride to the stirring tank 3 , add 0.31m waste liquid containing sodium sulfate and magnesium sulfate 3 , Stirring at 17°C for 1.5 hours, a white precipitate of calcium sulfate was generated, and the calcium precipitated material was obtained.

[0045] Filter the material after calcium precipitation with a filter area of ​​160m 2 The box filter press is filtered, and the filter cake is washed with 58 kg of water on the filter press, and the filtrate and washing water ...

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Abstract

The invention discloses a process of producing a snow melting agent from waste liquids obtained by subjecting laterite nickel ore to leaching with sulfuric acid and hydrochloric acid and to nickel precipitation. According to the process, a waste liquid obtained by subjecting laterite nickel ore to leaching with hydrochloric acid, iron removal with calcium carbonate and nickel precipitation with lime, which contains calcium chloride and magnesium chloride, and a waste liquid obtained by subjecting the laterite nickel ore to leaching with sulfuric acid, iron removal with calcium carbonate and nickel precipitation with sodium hydroxide are mixed according to a molar ratio that is Ca<2+>:SO4<2->=1:1 to produce calcium sulphate dihydrate, and to produce a magnesium chloride hexahydrate type snow melting agent by evaporative crystallization, wherein the second waste liquid contains sodium sulfate and magnesium sulfate. The process can either be big or small in production scale, and is simple in process route, low in investment, low in energy consumption, free of pollution to the environment, simple in operation, and low in production cost. The process provides an effective and economical route for treating the waste liquid containing the calcium chloride and the magnesium chloride, treating the waste liquid containing the sodium sulfate and the magnesium sulfate, reducing pollution and achieving comprehensive utilization.

Description

technical field [0001] The present invention relates to a kind of method for producing deicing agent from the nickel-precipitation waste liquid leached by sulfuric acid hydrochloric acid of laterite nickel ore, especially a waste liquid containing calcium chloride and magnesium chloride and waste liquid containing sodium sulfate and magnesium sulfate to produce calcium sulfate dihydrate, evaporated The invention discloses a method for crystallizing and producing magnesium chloride hexahydrate type deicing agent, which belongs to the field of resource recycling. technical background [0002] The sulfuric acid leaching solution of laterite nickel ore, calcium carbonate is added to remove iron, and the waste liquid after adding sodium hydroxide to precipitate nickel is mainly composed of magnesium sulfate and sodium sulfate. Direct discharge can cause high salinity in water bodies. Magnesium sulfate heptahydrate obtained by direct evaporation and crystallization (MgSO 4 ·7H ...

Claims

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Application Information

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IPC IPC(8): C01F5/30C01F11/46C09K3/18
Inventor 隋聚勇江山武桥德王泽强
Owner 江苏仁欣化工股份有限公司
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