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Process for complete utilisation of olivine constituents

A technology of olivine and brine, applied in chemical instruments and methods, improvement of process efficiency, inorganic chemistry, etc., can solve the problem of expensive waste treatment

Inactive Publication Date: 2007-05-30
AMG ADVANCED METALLURGICAL GRP INVESTMENT BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sediment contains nickel which makes waste disposal expensive

Method used

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  • Process for complete utilisation of olivine constituents
  • Process for complete utilisation of olivine constituents
  • Process for complete utilisation of olivine constituents

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: Oxidation / deposition of iron, nickel and manganese

[0036] Treat with air containing 22% MgCl 2 , 1.0% Fe, 0.05-0.06% Ni and 1.2% HCl crude brine of olivine, and adding Mg(OH) in various proportions 2 slurry to observe the extent of elemental deposition as a function of pH. The results show that the average residence time is about 50 minutes and relative to Fe 2+ For example, when the air flow rate is 3.6 times the stoichiometric amount, ferrous iron is easily oxidized by air.

[0037] Adding just below this amount of base, relative to complete oxidation and deposition of ferric hydroxide, the main compound formed is hematite Fe 2 o 3 . As the amount of alkali increases, a more complex phase is formed, i.e. bischofersite Mg 4 Fe(OH) 8 OCl·xH 2 O (or related phase).

[0038] A significant reduction in nickel content was observed, from 0.057% Ni to less than 1 ppm Ni, and approaching the required 0.3 ppm Ni. Then the molar ratio of Fe / Ni in the depos...

Embodiment 2

[0043] Example 2: Deposition of Ni in extracts of leached Fe-Ni sludge

[0044] Prepare a batch containing 25% MgCl 2 and 0.38% Ni synthetic brine. This solution was used to carry out a continuous deposition test in two 500-ml storage tanks. The residence time for each tank was 15 minutes. Add brine and 17% NaOH to the first storage tank.

[0045] The pH (dir) of the first storage tank was varied between 5.5 and 5.8. With increasing NaOH addition, the Ni concentration in the filtered samples decreased and stabilized at about 0.02% Ni (Fig. E2.1). As the amount of alkali added increases, the Cl in the sediment tends to decrease, which indicates that Cl is replaced by OH. At the same time, the Mg content tends to increase; but it is not higher than when the washed Fe-Ni filter cake is used as a benchmark at a lower concentration of the leached extract (3% MgCl 2 and 0.15% Ni) measured values ​​when depositing nickel hydroxide.

[0046] Figure E2.1 The relationship between...

Embodiment 3

[0055] Example 3: Deposition of Nickel Carbonate in Chloride Solution

[0056] In order to check whether nickel can be deposited as carbonate, several experiments were carried out. In some reference works, MgCO 3 and NiCO 3 The Ksp values ​​are not much different, and it is not clear which of them is lower, i.e. which carbonate is more likely to be deposited first.

[0057] A Mg / Ni molar ratio of 0.2 can be expected by dissolving the nickel hydroxide of the first deposition process (in the 25% leach extract). In the following experiments it was intended to apply a more conservative value of 0.3 and to prepare 10 kg batches of the following composition (added as chloride): 2.0% Ni, 0.248% Mg→Mg / Ni molar ratio=0.30.

[0058] Two 500-ml reactors were placed on a magnetic stirrer, and an inlet stream of nickel solution and 10% Na 2 CO 3 , corresponding to a residence time of 27 minutes for each tank. When the storage tank was filled, a temperature of 80°C was reached. Throu...

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Abstract

A novel process for complete utilization of olivine is based on purification of brine by oxidation and precipitation of iron and nickel compounds.

Description

technical field [0001] The present invention relates to a process that makes full use of the olivine component, and more particularly to a process that, in addition to the production of silica, results in iron and nickel products that can be used in the production of iron and nickel. High-purity magnesium chloride solution can also be prepared from olivine. In addition, the method is carried out completely free of any deposits. Background technique [0002] In general terms, co-pending Norwegian patent application 20040167 covers a process for the production of silica from olivine. [0003] Olivine is a natural mafic silicate mineral that is available in large quantities in various places in the world. It typically contains about 50% magnesia, about 40% silica and about 7-9% iron oxide. Olivine may contain up to 10% of accessory minerals (such as pyroxene, spinel, chromite, and chlorite). Olivine is easily soluble in acids and has long been used as a raw material for mag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/30C01G49/02C01G53/00C22B3/10C22B26/22C01BC01G49/00C01G49/06C01G53/04C01G53/06C22B3/44
CPCC22B23/0423C01G49/06C22B26/22C01G53/06C01G49/00C22B23/0453C01F5/30C22B3/44C01G53/04Y02P10/20
Inventor O·瓦勒维克T·R·约恩森A·阿什姆B·郎瑟斯
Owner AMG ADVANCED METALLURGICAL GRP INVESTMENT BV
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