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Method for extracting chromium from chromite through calcium-free roasting
The invention discloses a method for extracting chromium from chromite through calcium-free roasting. The method comprises the following steps that chromite, sodium carbonate and an additive are evenly mixed according to a certain proportion; adding an aqueous solution of sodium hydroxide into the uniformly mixed material for pelletizing; distributing the prepared balls into a rotary hearth furnace or a roller kiln, and roasting under an oxygen-enriched condition; and subjecting the roasted clinker to wet grinding, filtering and washing, and obtaining a sodium chromate leaching solution and residues. The selected additive is low in cost and easy to obtain, and the conversion rate of chromium can be remarkably increased; no new component is introduced into the residues, and meanwhile, the iron element is enriched in the residues. After the technology is adopted, the content of Cr2O3 and the content of Fe2O3 in the residues can reach 2 wt% or below and 60 wt% or above respectively, the residues can be directly mixed with iron ore to serve as steelmaking raw materials, and the resource utilization value of the residues is greatly increased.
本发明公开了一种铬铁矿无钙焙烧提取铬的方法，包括以下步骤：将铬铁矿、纯碱、添加剂按一定比例混合均匀；将混匀后的物料加氢氧化钠的水溶液造球；将制好的球布入转底炉或辊道窑中，在富氧条件下进行焙烧；将焙烧后的熟料经过湿磨、过滤、洗涤，得到铬酸钠浸出液和残渣。本发明选用的添加剂廉价易得，能显著提高铬的转化率；没有引入新的成分进入残渣，同时使铁元素在残渣中富集。采用本技术后，残渣中Cr2O3和Fe2O3的含量分别可以达到2wt％以下和60wt％以上，可直接与铁矿石混合作为炼钢原料，使残渣的资源化利用价值大大增加。
Method for extracting chromium from chromite through calcium-free roasting
The invention discloses a method for extracting chromium from chromite through calcium-free roasting. The method comprises the following steps that chromite, sodium carbonate and an additive are evenly mixed according to a certain proportion; adding an aqueous solution of sodium hydroxide into the uniformly mixed material for pelletizing; distributing the prepared balls into a rotary hearth furnace or a roller kiln, and roasting under an oxygen-enriched condition; and subjecting the roasted clinker to wet grinding, filtering and washing, and obtaining a sodium chromate leaching solution and residues. The selected additive is low in cost and easy to obtain, and the conversion rate of chromium can be remarkably increased; no new component is introduced into the residues, and meanwhile, the iron element is enriched in the residues. After the technology is adopted, the content of Cr2O3 and the content of Fe2O3 in the residues can reach 2 wt% or below and 60 wt% or above respectively, the residues can be directly mixed with iron ore to serve as steelmaking raw materials, and the resource utilization value of the residues is greatly increased.
本发明公开了一种铬铁矿无钙焙烧提取铬的方法，包括以下步骤：将铬铁矿、纯碱、添加剂按一定比例混合均匀；将混匀后的物料加氢氧化钠的水溶液造球；将制好的球布入转底炉或辊道窑中，在富氧条件下进行焙烧；将焙烧后的熟料经过湿磨、过滤、洗涤，得到铬酸钠浸出液和残渣。本发明选用的添加剂廉价易得，能显著提高铬的转化率；没有引入新的成分进入残渣，同时使铁元素在残渣中富集。采用本技术后，残渣中Cr2O3和Fe2O3的含量分别可以达到2wt％以下和60wt％以上，可直接与铁矿石混合作为炼钢原料，使残渣的资源化利用价值大大增加。
Method for extracting chromium from chromite through calcium-free roasting
一种铬铁矿无钙焙烧提取铬的方法
DUAN JING (author) / SHANG QIN (author) / HOU LIQIANG (author) / CHEN MINGXUAN (author) / LIAO RONG (author) / CHEN DAN (author) / CHENG XICHUAN (author)
2021-06-01
Patent
Electronic Resource
Chinese
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