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Method for enriching chromium from laterite ore

A laterite ore enrichment technology, applied in the field of iron and steel metallurgy, can solve the problems of emphasizing separation and recovery, large energy consumption, and complex intercalation of elements, and achieve large-scale industrial production, high comprehensive utilization of resources, and efficient enrichment and recovery. Effect

Active Publication Date: 2014-11-19
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its chemical composition is not fixed, its physical and chemical properties vary greatly, the intercalation relationship of various elements is complicated, and its development and utilization are difficult. It is difficult to realize the efficient comprehensive utilization of this kind of ore with existing technical means, and most of them focus on the separation and recovery of iron and nickel.
Aiming at the recovery and utilization of chromium resources in laterite ore, the existing technology mostly adopts the method of high-temperature smelting to produce chromium-containing pig iron, such as the patent "a process for smelting low-grade laterite ore (application number: 201210129266.7)". First, the laterite ore and coal The powder is mixed and placed in a rotary kiln, preheated to 800°C-1200°C for roasting-pre-reduction, and then the charge in the rotary kiln is transferred to the injection high-temperature section, and smelted at 1400°C-1800°C to prepare nickel-chromium Pig iron has problems such as high operating temperature, high energy consumption, and extremely high equipment requirements
In addition, the patent "Clean Production Process for Treating Low-grade Laterite Nickel Ore Using Sodium Hydroxide Alkali Fusion Method (Application Number: 200910082369.0)" proposes a process for treating low-grade laterite nickel ore by using sodium hydroxide alkali fusion method. The nickel ore and sodium hydroxide are roasted at high temperature, and the roasted material is washed and filtered to leach the water-soluble chromium, aluminum and other valuable metals generated after the reaction in the laterite nickel ore, and then the filter residue is extracted by high-pressure acid leaching process nickel and cobalt; this process has the advantages of a high degree of comprehensive utilization of resources, but it is only suitable for processing low-magnesium and low-silicon content types of laterite ore, and the value-added utilization of iron, the most important component of laterite ore, is not high.

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  • Method for enriching chromium from laterite ore

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Effect test

Embodiment 1

[0031] After the laterite ore is crushed to a particle size of 3.0mm, mix 12% sodium sulfate with iron ore, and then press it into a 40mm×40mm×31mm agglomerate. The reduction roasting time at ~980°C is 7 hours. After the roasted product is crushed to a particle size of less than 1.0mm, the ore is ground until the particle size is less than 200 mesh and reaches about 90%. Magnetic separation under a magnetic field strength of 1000Gs, the iron removal rate is 93.88%; After the non-magnetic material is separated and dried by solid-liquid, it is placed in the reactor at a mass-liquid-solid ratio (L / S) of 10, and is mixed with 30% dilute H 2 SO 4 solution, leaching at room temperature, the leaching time is 30min, and the obtained chrome concentrate Cr after solid-liquid separation and drying 2 o 3 The grade is 24.92%, Cr 2 o 3 The recovery rate was 71.75%.

Embodiment 2

[0033] After the laterite ore is crushed to a particle size of 3.0mm, mix soda powder with a mass percentage of 12% and iron ore, and then press it into a 40mm×40mm×31mm agglomerate. The reduction roasting time at 1000°C is 7 hours. After the roasted product is crushed to a particle size of less than 1.0mm, the ore is ground until the particle size is less than 200 mesh and reaches about 90%. The iron removal rate is 97.61% under the magnetic field strength of 1000Gs; After the magnetic material is separated and dried by solid-liquid separation, it is then placed in the reactor at a mass-liquid-solid ratio (L / S) of 10, with 30% dilute H 2 SO 4 solution, leaching at room temperature, the leaching time is 30min, and the obtained chrome concentrate Cr after solid-liquid separation and drying 2 o 3 Grade is 35.59%, Cr 2 o 3 The recovery rate was 56.03%.

Embodiment 3

[0035] After the laterite ore is crushed to a particle size of 3.0mm, mix 12% sodium bicarbonate and 4% soda powder with the iron ore, and then press it into a 40mm×40mm×31mm agglomerate, and dry it at 780-800°C Enter the kiln, reduce and roast at 1000-1050°C for 7 hours, crush the roasted product to a particle size of less than 1.0mm, grind the ore until the particle size is less than 200 mesh and reach about 90%, and magnetically separate under 1000Gs magnetic field strength to remove iron The rate is 93.54%; after the non-magnetic material is separated and dried by solid-liquid separation, it is then placed in the reactor at a mass liquid-solid ratio (L / S) of 10, and is mixed with 30% dilute H 2 SO 4 solution, leaching at room temperature, the leaching time is 30min, and the obtained chrome concentrate Cr after solid-liquid separation and drying 2 o 3 The grade is 27.68%, Cr 2 o 3 The recovery rate was 72.03%.

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Abstract

The invention discloses a method for enriching chromium from laterite ore. The method comprises the following steps: crushing laterite ore into ore particles of which the particle sizes are less than 3.0mm, burdening an additive in percentage by mass, evenly mixing, briquetting, drying, placing in a rotary kiln, carrying out reduction roasting in the presence of coal used as a reductant, quenching in water, cooling, crushing the roasted product, grinding, and carrying out magnetic separation to remove iron; carrying out solid-liquid separation on the non-magnetic material, leaching with a diluted H2SO4 solution at a normal temperature to remove acid-soluble gangue components, such as Al2O3, SiO2 and Na2O and carrying solid-liquid separation to obtain the chromium concentrate. The method disclosed by the invention has the advantages of simple process, convenience in operation, high comprehensive utilization rate of resources, low reduction temperature and low energy consumption, the chromium resource is efficiently enriched and recovered from laterite ore and the valuable components, such as iron and aluminum are comprehensively recovered; the method is especially suitable for the development and utilization of laterite ore as a chromium-containing mineral existing in the form of a spinel and with low iron grade and high content of aluminum. By adopting the method, the scale industrial production can be achieved.

Description

technical field [0001] The invention relates to a method for enriching chromium from laterite ore, in particular to a development and utilization process of laterite ore with chromium-containing minerals in the form of spinel, low iron grade and high aluminum content, belonging to the field of iron and steel metallurgy. Background technique [0002] Chromium is a strategic metal with many excellent properties, and its compounds are widely used in industries such as metallurgy, chemical industry and refractory materials. In the metallurgical industry, ferrochrome alloys are mainly used for alloying in the steelmaking process to increase the hardness, toughness, ductility, wear resistance and corrosion resistance of steel, and are used in the production of stainless steel, bearing steel, spring steel, tool steel and military An important alloying element of special steel. Chromium alloy products are widely used in ships, tanks, guns, vehicles, machinery manufacturing, electri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/32
Inventor 李光辉姜涛饶明军罗骏张元波范晓慧王长根李骞彭志伟陈许玲朱忠平郭宇峰黄柱成杨永斌徐斌梁斌珺游志雄刘明霞曾精华
Owner CENT SOUTH UNIV