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A smelting method and clean technology, applied in the field of efficient and clean molybdenum smelting, can solve the problems of low sulfur content in flue gas, low reagent consumption, short production cycle, etc., and achieve improved recovery rate, low reagent consumption and short production cycle. Effect
Active Publication Date: 2016-08-10
CENT SOUTH UNIV
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[0003] Aiming at a series of defects existing in the existing lime sulfur-fixing roasting process, the purpose of the present invention is to provide a low reagent consumption, short production cycle, easy process control, high molybdenum recovery rate, low sulfur content in flue gas, and waste water. Zero-emission molybdenum smelting method
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Embodiment 1
[0026] Take 30g molybdenum concentrate (molybdenum grade 41%), 30g slaked lime, MoS 2 The molar ratio of calcium hydroxide to calcium hydroxide is about 1:3, mixed and granulated. After drying, it is baked in a muffle furnace at 450°C for 1 hour, and then heated to 650°C for 1.5 hours. The retention rate and oxidation rate are 99.45% and 99.32%, respectively, and the sulfur fixation rate reaches 98.15%.
[0027] After calcining to 80 mesh, adding 2.5mol / L hydrochloric acid, stirring for 60min under the conditions of liquid-solid ratio of 10:1mL / g, stirring speed of 300rpm, and leaching temperature of 50℃, the leaching rate of molybdenum reached 99.7%.
[0028] The molybdenum-containing acid leaching solution adopts 30% P507-70% sulfonated kerosene at room temperature with three-stage countercurrent extraction, the extraction rate of molybdenum reaches 99.9%, and the negative molybdenum organic phase adopts 1.2mol / L NH 3 ·H 2 O+0.15mol / L NH 4 NO 3 Perform 3 times of reflux back extra...
Embodiment 2
[0031] Take 100g molybdenum concentrate (molybdenum grade 5%), 7.7g slaked lime, MoS 2 The molar ratio of calcium hydroxide to calcium hydroxide is about 1:2. It is mixed and granulated. After drying, it is baked in a muffle furnace at 450°C for 1 hour, and then heated to 620°C for 1 hour. The retention rate and oxidation rate were 99.23% and 99.18%, respectively, and the sulfur fixation rate reached 98.2%.
[0032] After calcining to 100 mesh, adding 2mol / L hydrochloric acid, stirring for 30min under the conditions of liquid-solid ratio of 5:1mL / g, stirring speed of 300rpm, and leaching temperature of 40℃, the leaching rate of molybdenum reached 99.1%.
[0033] The molybdenum-containing acid leaching solution adopts 20% P507-80% sulfonated kerosene at room temperature with three-stage countercurrent extraction, the extraction rate of molybdenum reaches 99.7%, and the negative molybdenum organic phase adopts 1mol / L NH 3 ·H 2 O+0.1mol / L NH 4 Cl was refluxed and stripped three times a...
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Abstract
The invention provides an efficient and clean molybdenum smelting method. The method comprises the steps that lime sulphur-fixed roasting is conducted on molybdenite through a gradient heat preservation method; roasted products are leached with a leaching agent, namely roasted product, and molybdenum-contained leach liquid is obtained; the molybdenum-contained leach liquid is sequentially treated by an acid phosphorus extraction system for extracting molybdenum, and an ammonium hydroxide/ammonium salt system for back-extracting molybdenum, and molybdenum-contained strip liquid and molybdenum raffinate are obtained; impurities in the molybdenum-contained strip liquid are removed through a Mg(OH)2 one-step precipitation method, evaporation and concentration are conducted, and ammonium molybdate products are obtained; and sulfuric acid is added into the molybdenum raffinate for regeneration, calcium sulphate dihydrate products are obtained, and regenerated liquid serves as a leaching agent and is returned back to the leaching process. By the adoption of the method, molybdenum mineral raw materials can be cleaned and treated efficiently, and ammonium molybdate can be prepared, the molybdenum recovery rate reaches 99%, the sulfur fixing rate reaches 98% or over, reagent consumption is low, the production period is short, the process is easy to control, the reaching residue quantity is greatly reduced, zero emission of waste water is achieved, and industrialized application is achieved easily.
Description
Technical field [0001] The invention relates to an efficient and clean molybdenum smelting method, belonging to a technical method of molybdenum smelting. Background technique [0002] Molybdenum is a rare metal resource. With years of development, high-quality resources are gradually scarce, and the processing volume of complex and low-grade molybdenum ore will increase year by year. Rotary kiln, multi-hearth furnace oxidation roasting process complex molybdenum ore is prone to kiln formation, oxidation roasting time-consuming, large amount of flue gas, large furnace power consumption, high residual sulfur content of calcine, high impurity content, low recovery rate of ammonia leached molybdenum And other issues. The treatment of low-concentration sulfur dioxide flue gas is the main environmental protection problem of molybdenite oxidation roasting. The scale of molybdenum smelting is relatively small, and it is too small to make sulphuric acid by roasting flue gas alone. Alth...
Claims
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