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A technology of iron red and iron ions, which is applied in the chemical industry, can solve the problems of slow dissolution of harmful components, occupying large land for storage, environmental pollution, etc., to solve the problem of iron slag storage, high iron removal efficiency, and environmental burden effect
Active Publication Date: 2011-08-17
CHINA ENFI ENGINEERING CORPORATION
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This method has a large amount of slag after iron removal. At present, the slag cannot be recycled as a resource. It not only occupies a large amount of land for storage, but also causes environmental pollution due to the slow dissolution of harmful components.
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example 1
[0034] Take 1L of nickel laterite acid leaching solution, its iron content is 42g / L (98% of which is ferric iron). Adjust its pH to 2.1 with NaOH, add it to an autoclave, control the temperature at 200°C, oxygen partial pressure 0.2MPa, filter after reaction, wash with 3 times the amount of water slurry, and dry at 100°C.
[0035] After analysis, the iron precipitation rate is 96.6%, the iron oxide red content is >97%, and the Ni precipitation rate is <1.9%.
example 2
[0037] Take 1L of nickel laterite acid leaching solution, its iron content is 42g / L (98% of which is ferric iron). Adjust its pH to 2.3 with NaOH, add it to an autoclave, control the temperature at 210°C, cycle the seed crystal 4 times, oxygen partial pressure 0.2MPa, filter after reaction, wash with 3 times the amount of water slurry, and dry at 100°C.
[0038] After analysis, the iron precipitation rate is 98.0%, the iron oxide red>97%, and the Ni precipitation rate<1.2%.
example 3
[0040] Get 1L of solution before zinc ore iron deposit precipitation, its iron content 20g / L (wherein 98% is ferric iron). Adjust its pH to 2.0 with NaOH, add it to an autoclave, control the temperature at 190°C, cycle the seed crystal 4 times, oxygen partial pressure 0.2MPa, filter after reaction, wash with 3 times the amount of water slurry, and dry at 100°C.
[0041] After analysis, the iron precipitation rate is 95.4%, the iron oxide red>95%, and the Zn precipitation rate<1.4%.
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Abstract
The invention provides a method for preparing iron oxide red by utilizing a solution containing iron ions, wherein the iron ions are at least one kind of ferrous ions and ferric ions. The method comprises the following steps of: (1) adding the solution containing iron ions into a reactor; (2) adjusting the pH value of the solution to be 0.5-3.0; (3) adjusting the temperature in the reactor to be 180-220 DEG C, maintaining the temperature for a predetermined time at oxidizing atmosphere to obtain a solid-liquid mixture containing ferric oxides; and (4) carrying out solid liquid separation on the solid-liquid mixture to obtain an iron oxide red product. By utilizing the method, iron in the solution can be effectively recycled and the iron oxide red can be prepared.
Description
technical field [0001] The invention relates to the field of chemical industry, in particular to a method for preparing iron red from a solution containing iron ions. Background technique [0002] At present, when zinc, nickel, cobalt or other valuable metals are produced by wet method, the acid leaching process is usually adopted. When the valuable metals are leached, the iron in the ore is also leached. The subsequent purification process includes the step of iron removal. In the industry, yellow (sodium, ammonium) jarosite or goethite method is usually used to remove iron, that is, the temperature of the leaching solution is controlled at a relatively high level, and sodium / potassium is introduced into the leaching solution. / ammonium ions, and the iron ions in it to synthesize iron vitriol, or reduce the ferric iron in the leaching solution to divalent, and remove the iron as goethite under oxidation conditions. The iron slag after iron removal is sent to the tailings d...
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