Comprehensive utilization method of low-grade magnesite
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A magnesite, low-grade technology, applied in the direction of magnesium oxide, magnesium hydroxide, calcium carbonate/strontium/barium, etc., can solve the problems of complicated process, high cost, unusable acid, etc.
Inactive Publication Date: 2011-12-21
XINJIANG LANTIAN WEIYE TECH DEV
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Problems solved by technology
The recovery rate of some mines in my country is less than 50%, or even lower, resulting in a great waste of resources
The disadvantage of the process is that the added acid cannot be used, and it
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Embodiment 1
[0036] Embodiment 1, the method for comprehensive utilization of this low-grade magnesite is carried out according to the following steps:
[0037] In the first step, first crush the magnesite to more than 45 meshes, and react with the high-temperature hydrochloric acid solution produced on site. Over hours, elements such as magnesium and iron form chlorides with chlorine;
[0038] In the second step, the magnesium oxide obtained in the first step is reacted with ammonia water with a concentration of 5 wt% to 10 wt%, the reaction temperature is 50°C to 80°C, air is introduced or hydrogen peroxide is added as an oxidant, and the hydrogen peroxide in the solution is The valence of iron becomes trivalent, and the pH is controlled at 7 to 8 to form iron red precipitate, which becomes iron red after drying, and the drying temperature is above 110°C to obtain iron red;
[0039] In the third step, the chloride obtained in the second step is neutralized with 10% to 20% ammoni...
Embodiment 2
[0043] Embodiment 2, the method for comprehensive utilization of this low-grade magnesite is carried out according to the following steps: take 1 kg of Xinjiang Shanshan Jianshan magnesite, its main component includes MgCO 3 80.96%, Fe 2 O 3 0.53%, CaCO 3 7.78%、Al 2 O 3 1.62%, SiO 2 1.89%, weight loss at 800°C: 48.25%, mixed with the water vapor generated after the decomposition of magnesium chloride and the condensed liquid of the HCl mixture, and reacted in an enamel reactor, where the concentration of HCl is 15%, a total of 4500 ml, the reaction temperature 50°C, reaction time 1 hour, normal pressure. Filter after the reaction, put the filtrate into the reactor, add 20ml of hydrogen peroxide with a concentration of 30wt% to carry out the oxidation reaction, the reaction temperature is 80°C, then slowly add 5.6% ammonia solution to carry out the reaction of iron precipitation, the pH is controlled above 7, and then Stop the reaction, filte...
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Abstract
The invention relates to a method for comprehensively utilizing low-grade magnesite, which comprises the following steps of: step 1) crushing the magnesite to react with hydrochloric acid to obtain acid leaching liquor and acid leaching residues; step 2) preparing iron oxide red; step 3) obtaining high-purity magnesium hydroxide; step 4) obtaining light calcium carbonate products; step 5) adding magnesium oxide into liquid after magnesium removal to conduct ammonia evaporation reaction and evaporation concentration; and step 6) decomposing the liquid after ammonia evaporation in a closed reactor to produce magnesium oxide and hydrochloric acid. In the invention, the magnesite is used to prepare the high-purity magnesium hydroxide and high-purity magnesium oxide and the hydrochloric acid is used to leach minerals, the leaching rate of the hydrochloric acid is higher than the leaching rate of sulfuric acid; and since ammonia and the hydrochloric acid in the technological process are prepared in situ and generated ammonia chloride is locally decomposed into the ammonia and the hydrochloric acid for cycle use, not only can the biggest advantage of the traditional brine-ammonia method which can be used for preparing the high-purity magnesium hydroxide be exerted, but also the transportation of the hydrochloric acid and the ammonia can be avoided, solid wastes are not produced and emitted and the method is an environment-friendly clean process.
Description
technical field [0001] The invention relates to the technical field of comprehensive utilization of non-metallic resources and resource utilization of solid waste, and relates to a method for comprehensive utilization of low-grade magnesite. Background technique [0002] China is the country with the most abundant magnesite resources in the world. The total reserves of ore are 3 billion tons, ranking first in the world. The important characteristics of magnesite are that the area is not widely distributed, the reserves are relatively concentrated, and there are many large deposits. There are 27 mining areas with proven reserves, distributed in 9 provinces (regions), and Liaoning magnesite reserves are the most abundant, accounting for 85.6% of the country's total; Shandong, Tibet, Xinjiang, and Gansu follow. [0003] At present, most of the magnesia materials produced and exported in my country are primary processed products of raw materials, accounting for more than half ...
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