Antimony sulfide concentrate oxygen-enriched melting tank melting method
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An oxygen-enriched molten pool smelting and antimony sulfide technology, applied in the field of antimony sulfide concentrate oxygen-enriched molten pool smelting, to achieve the effect of eliminating antimony matte phase, good quality of antimony white, and improving recovery rate
Active Publication Date: 2013-06-26
CENT SOUTH UNIV +1
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[0005] Due to the above reasons, the existing oxygen-enriched melting pool smelting technology cannot meet the requirements of industrial applications. The current antimony...
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Embodiment 1
[0083] The hearth size is 1600×2500mm and the hearth area is 4m 2 Experiments were carried out in a side-blown furnace.
[0084] Preparation:
[0085] Mix antimony concentrate with limestone, quartz sand and iron ore crushed to less than 20mm. The mass percentage of Sb in the mixed material is 25%, of which SiO 2 , FeO, and CaO mass percentages are 26%, 28%, 9% respectively, and sulfur mass percentage is 19%; add water to the above materials in a cylinder granulator until the material moisture is 8%, and make the particle size The pellets of 5mm~18mm are ready for use.
[0086] Oxidation smelting:
[0087] Add the above-mentioned spherical pellets into the above-mentioned side-blown furnace at a feeding rate of 10t / h, control the melting temperature between 1050-1300°C, and oxygen-enriched air blasted into the main tuyeres 2 The concentration is 70%, the rest is N 2 , the pressure of oxygen-enriched air is 0.8MPa, and the flow rate of oxygen-enriched air is 3500Nm 3 / h, ...
Embodiment 2
[0091] Design a φ1600×2000 bottom blowing furnace, set an oxygen lance at the bottom of the furnace, and conduct experiments in this furnace.
[0092] Preparation:
[0093] The antimony concentrate is mixed with limestone, quartz sand and iron ore crushed to less than 20mm. The mass percentage of Sb in the mixed material is 33%, of which SiO 2 , FeO, and CaO mass percentages are 20%, 22%, 10% respectively, and sulfur mass percentage content is 16%; add water to the above materials in a cylinder granulator until the material moisture is 10%, and make the particle size The pellets of 5mm~22mm are ready for use.
[0094] Oxidation smelting:
[0095] Add the above pellets into the above bottom blowing furnace at a feeding rate of 300kg / h, control the melting temperature between 1000~1200°C, blow industrial oxygen and industrial nitrogen with a purity greater than 99% from the oxygen lance, oxygen and Nitrogen pressure is 0.4MPa, oxygen flow rate is 75m 3 / h, nitrogen flow rate...
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Abstract
The invention discloses an antimony sulfide concentrate oxygen-enriched melting tank melting method. For solving problems of high pollution and high energy consumption of existing blast furnace volatilization melting technologies, and the impossibility of practical industrialization of existing oxygen-enriched melting tank melting technologies, the antimony sulfide concentrate oxygen-enriched melting tank melting method provided by the invention comprises the steps that: (1) material blending is carried out, wherein antimony concentrate limestone, quartz sand and iron ore are blended; (2) the blended material is granulated; (3) melting is carried out, wherein antimony sulfide is subjected to a volatilization or oxidation reaction and enters flue gas, and partial antimony sulfide enters melting slag through the oxidation reaction; (4) smoke dust recovery is carried out; (5) antimony oxide in the melting slag is reduced into metal antimony; (6) crude antimony and reduction slag are discharged in a stratified manner; wherein the crude antimony is used to be refined into refined antimony, and precious metal is recovered. With the method provided by the invention, antimony sulfide concentrate self-heat melting is realized, energy saving and consumption reducing are realized, and antimony and gold recovery rates are greatly improved. Antimony white has good quality, and can be directly subjected to reduction melting to produce refined antimony.
Description
technical field [0001] The invention relates to a method for smelting an antimony sulfide molten pool, in particular to a method for smelting an antimony sulfide concentrate in an oxygen-enriched molten pool. Background technique [0002] Existing antimony smelting usually adopts the blast furnace volatilization smelting technology. The antimony in the antimony sulfide concentrate is volatilized into the dust in the form of antimony oxide to form crude antimony oxide. This process requires a large amount of coke as a reducing agent and heat source, and simultaneously produces A large amount of low concentration SO 2 flue gas, high energy consumption, low concentration of SO 2 serious pollution. [0003] In order to solve the above problems, a lot of research has introduced oxygen-enriched smelting technology into antimony smelting. Patent CN101768672 also provides a method for smelting antimony by using oxygen-enriched top blowing to smelt antimony. In this method, materia...
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