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A method for recovering waste magnesia-chromium refractories with all elements

A refractory material, magnesia-chromium technology, applied in the field of comprehensive recycling of refractory materials, can solve the problems of high energy consumption, volatile tail gas pollution, etc., and achieve the effects of simple method, low cost, significant economic value and environmental benefits

Active Publication Date: 2019-12-31
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The Chinese invention patent application with the publication number CN107419102A discloses "a method for separating valuable metals in waste magnesia-chromium refractory flotation tailings", which further treats magnesia-chromium refractory flotation tailings by chlorination and volatilization, flotation The impurity metals in the tailings are further removed, so that the final tailings can be used as raw materials for the production of refractory materials, but the chlorination and volatilization method consumes a lot of energy, and the volatile tail gas pollution is serious

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  • A method for recovering waste magnesia-chromium refractories with all elements
  • A method for recovering waste magnesia-chromium refractories with all elements
  • A method for recovering waste magnesia-chromium refractories with all elements

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Embodiment 1

[0040] The raw material used is the waste lining magnesia-chromium refractory brick of a silver converter in a smelter in Hunan, which contains 27.58% Mg, 10.06% Cr, 6.97% Fe, Cu, As, Ag, Sb, Pb, Bi and other impurity metals. The content is 21.89%.

[0041] The waste magnesia-chrome refractory bricks are taken and ground into materials to be soaked with a fineness of 70-80% less than 0.15 mm. The preparation components are 5mol / L HCl and 1.5mol / L MgCl 2 mixed solution as leaching agent. Add the material to be leached into the leaching agent at a liquid-solid ratio of 5:1, leaching for 1.5 hours at a constant water temperature of 80°C and a stirring intensity of 400r / min, and filter the chromium-rich leaching residue after the leaching reaction Washing and drying to obtain the chromite product, the washing solution is incorporated into the magnesium-rich leaching solution. Add calcined magnesia to the magnesium-rich leaching solution to gradually adjust the pH of the solutio...

Embodiment 2

[0047] The raw material used is the discarded lining magnesia-chromium refractory brick of a copper converter in a smelter in Hunan, which contains 24.92% Mg, 9.38% Cr, 6.95% Fe, Cu, As, Ag, Sb, Pb, Bi and other impurity metals. The content is 25.26%.

[0048] The waste magnesia-chrome refractory bricks are taken and ground into materials to be soaked with a fineness of 70-80% less than 0.15mm. The preparation components are 5mol / L HCl and 1.0mol / L MgCl 2 mixed solution as leaching agent. The material to be leached is added to the leaching agent at a liquid-solid ratio of 6:1, and the leaching reaction is performed for 1.0 h under the conditions of a constant water temperature of 85 ° C and a stirring intensity of 450 r / min. After the leaching reaction is finished, wash and dry the chromium-rich leaching slag obtained by suction filtration to obtain chromite products. The washing solution is incorporated into the magnesium-rich leaching solution, and an appropriate amount of...

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Abstract

The invention discloses a full-element recovering method for abandoned magnesium-chromium fireproof materials. The full-element recovering method for the abandoned magnesium-chromium fireproof materials comprises the following steps that the abandoned magnesium-chromium fireproof materials are ground to a certain fineness, and materials to be leached are obtained; the materials to be leached are put into a leaching agent according to a set liquid-solid ratio, a stirring leaching reaction is carried out, after leaching is completed, suction filtration is carried out, and chromium-enriched leaching residues and magnesium-enriched leaching liquid are obtained; the chromium-enriched leaching residues are washed and dried, a chromite product is obtained, and then washing liquid is combined intothe magnesium-enriched leaching liquid; caustic-calcined magnesite is added into the magnesium-enriched leaching liquid, the pH of the leaching liquid is adjusted to 7.0-7.5, a stirring reaction is carried out, after the reaction is completed, suction filtration is carried out, and sediments and magnesium chloride mother liquor are obtained; the sediments are washed and dried, a mixed metal compound is obtained, and the washing liquid is combined into the magnesium chloride mother liquor; and the magnesium chloride mother liquor is subjected to evaporative crystallization, and a magnesium chloride product is obtained. The method is simple, the cost is relatively low, the recovering rate is high, and full-element recovering of the abandoned magnesium-chromium fireproof materials is achieved.

Description

technical field [0001] The invention belongs to the field of comprehensive recovery and utilization of refractory materials, and in particular relates to a method for recovering waste magnesia-chromium refractory materials with all elements. Background technique [0002] According to incomplete statistics, more than 4 million tons of magnesium-chromium refractories are discarded in my country every year. At present, these discarded magnesia-chromium refractories are difficult to deal with. In order to recover metals, smelters generally crush a small amount of refractory materials and use them as auxiliary materials for metallurgical raw materials for smelting. Most of the refractory materials are stored in landfills. Although the cost of such a simple treatment method is small, it causes a serious waste of valuable metal resources. More importantly, the toxic and harmful metals in it have caused great harm to the environment. At present, the country has paid more and more at...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C01F5/30
CPCC01F5/30C22B7/007Y02P10/20
Inventor 焦芬刘维覃文庆李卫薛凯王旭张政权
Owner CENT SOUTH UNIV
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