Oxygen-enriched molten pool antimony refining production process

Abstract

The invention discloses an oxygen-enriched molten pool antimony refining production process, and belongs to the field of smelting of nonferrous metal. The process comprises the following steps: 1) batching: raw materials are uniformly mixed according to a mass ratio to obtain a mixture; 2) granulation: the uniformly mixed mixture is prepared as spherulites; 3) the prepared spherulites are fed in an oxygen-enriched oxidation furnace for oxidation smelting to prepare a primary high-temperature melt and liquid-state high-antimony ore slag; 4) reduction smelting: the liquid-state high-antimony ore slag flows in an oxygen-enriched reducing furnace for reduction smelting to prepare a secondary high-temperature melt and reducing furnace slag; 5) metal recovery: the reducing furnace slag flows in a fuming furnace through a slag chute; and recovery includes valuable metal; and 6) the smoke is recovered. The process effectively increases the SO2 concentration in smelted smoke to achieve conventional acid preparation system requirements, reduces the pollution, meanwhile, increases the yield, and reduces the energy consumption.

Description

[0001] 【Technical field】 [0002] The invention relates to a nonferrous metal smelting process, in particular to a production process for smelting antimony in an oxygen-enriched molten pool. [0003] 【Background technique】 [0004] For the treatment of brittle sulfur-lead-antimony ore, the current smelting process is: antimony-lead concentrate → boiling roasting → sintering disc sintering → blast furnace reduction → crude antimony-lead alloy. The process flow is as follows: the brittle sulfur-antimony-lead concentrate is roasted and desulfurized in a fluidized fluidized furnace, and the calcined sand is mixed with the brittle sulfur-antimony-lead concentrate, returned material, quartz sand, limestone powder, and anthracite, and sintered with a sintering plate, and then the sintered block is Blast furnace reduction smelting produces antimony-lead alloy. However, the defects and deficiencies of the traditional smelting process mainly include: [0005] (1) Roasting, sintering ma...

AI Technical Summary

Problems solved by technology

[0005] (1) Roasting, sintering machines, and blast furnaces produce low-concentration SO 2 Flue gas, not only cannot be equipped with a conventional acid plant to produce sulfuric acid, but also must be discharged after desulfurization treatment

[0006] (2) The process is long, there are many intermediate links, and the sintering process requires a relatively large ratio of returned materials and reciprocation, resulting in low production efficiency, many intermediate products, and low metal recovery rate

[0007] (3) Compared with the use of oxygen-enriched and high-temperature intensified smelting, there is a big gap in production efficiency, unit product production cost, and investment return.

[0008] (4) High energy consumption

The chemical reaction of sulfur in the raw material is scattered and the heat utilization is low. The comprehensive energy consumption per unit product of refined antimony reaches 2400-2500kgce / t. At the same time, the flue gas is scattered and the temperature is low. It is impossible to install a waste heat boiler to recover the waste heat of the flue gas.

[0009] (5) It is difficult to control the environmental pollution of smelting production sites such as sintering machines, and the working conditions are poor

[0010] (6) The degree of production automation is low

[0011] (7) Metallurgical coke is required for blast furnace reduction, and coal cannot be used directly