A production process for low-temperature oxidation smelting of lead-antimony mixed ore in an oxygen-enriched molten pool

Abstract

The invention discloses a production process for low-temperature oxidation smelting in an oxygen-enriched molten pool of lead-antimony mixed ore, which belongs to the field of nonferrous metal smelting. The process includes the following steps: 1) batching: mix the raw and auxiliary materials evenly according to the mass ratio to obtain a mixture; 2) granulation: make the mixture into pellets; 3) oxidation smelting: send the prepared pellets into the Oxygen oxidation furnace for low-temperature oxidation smelting, after smelting, liquid oxide slag is produced, which enters reduction smelting through the chute; after smelting, high-concentration SO 2 The flue gas is sent to acid production after cooling down and collecting dust. The present invention: 1) low-concentration SO is produced in the existing oxidation smelting production process for brittle pyrotite 2 Environmental protection treatment is required to meet the emission standards. By using oxygen-enriched molten pool for smelting, the SO in the flue gas after smelting is effectively increased. 2 Concentration, meet the configuration requirements of conventional acid system, reduce pollution, improve recovery rate; 2) Adopt low-temperature oxygen-enriched oxidation process, greatly reduce smoke rate, and improve smoke quality at the same time.

Description

【Technical field】 [0001] The invention relates to a nonferrous metal smelting process, in particular to a production process for low-temperature oxidation smelting in an oxygen-enriched molten pool of lead-antimony mixed ore. 【Background technique】 [0002] 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: [000...

AI Technical Summary

Problems solved by technology

[0003] (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

[0004] (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

[0005] (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.

[0006] (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.

[0007] (5) It is difficult to control the environmental pollution of smelting production sites such as sintering machines, and the working conditions are poor

[0008] (6) The degree of production automation is low

[0009] (7) Metallurgical coke is required for blast furnace reduction, and coal cannot be used directly