Cooperative processing and recycling method for material containing iron and/or zinc, lead, copper and tin, and the like and molten steel slag

Abstract

The invention discloses a process method for cooperatively and continuously processing waste containing iron and / or zinc, lead, copper and tin, and the like and molten steel slag on line, separating and recycling metal such as iron, zinc, lead, copper and tin as well as molten slag. The cooperative processing and recycling method is characterized in that pellets prepared from waste containing iron, zinc, lead, copper, tin and the like, particles, a blocky material containing iron, zinc, lead, copper, tin and the like and high-temperature molten steel slag are added into a reducing, volatilizing and smelting furnace, molten iron, which is obtained by air-blowing, adding of fuels such as coal gangues and flux such as high silicon and high aluminum, high-temperature reducing and volatilizingtreatment, is discharged from an iron outlet of the reducing, volatilizing and smelting furnace; volatilized substances such as zinc and lead and smoke gas are sucked into a dust collector for being collected and utilized; enriched metal such as gold, silver, copper, tin and lead is discharged from a discharge hole in the bottommost part of the reducing, volatilizing and smelting furnace for beingrecycled; and molten slag is discharged through a slag outlet, water slag and the like or the molten slag is returned into a converter for being recycled. Waste containing iron, zinc, lead, copper, tin and the like, molten steel slag and coal gangue waste slag and the like are cooperatively and continuously treated to separate and recycle useful metal, so that remarkable energy-saving environment-friendly social benefits and economic benefits are achieved.

Description

technical field [0001] The invention relates to iron and / or iron-containing and / or zinc-lead-copper-tin-cadmium-bismuth-antimony-germanium-thallium-gallium gold-silver-nickel-chromium-potassium-sodium and other non-ferrous metal material solid wastes and smelters in iron and steel industry, nonferrous metal industry, acid chemical industry and other industries. On-line collaborative continuous processing and recycling of high-iron oxide, high-alkalinity, high-temperature molten steel slag (including steelmaking molten steel slag, continuous casting ladle injection residue, stainless steel molten steel slag, etc.) discharged from steel converter (or electric furnace, the same below) during steelmaking slag A production process method, particularly involving a use of carbon-containing reducing agent and / or iron-containing and / or zinc-lead-copper-tin-cadmium-bismuth-antimony-gold-silver-nickel-chromium-potassium-sodium and other non-ferrous metal pellets (or agglomerates), Pellet...

AI Technical Summary

Problems solved by technology

For this low-value molten slag steel slag or blast furnace slag (hardly containing iron), adopt feeding or electric heating to adjust temperature and adjust alkalinity, separate and reprocess and utilize " two-step method " processing technology method, there is following problem: 1, The technical process route is based on the direction of fixing P (phosphorus) in molten slag, enriching P, and then separating P in the slag to recover P. 2 o 5 Controlled, so that P is not reduced into molten iron, still with P 2 o 5 remain in the slag to give 2CaO·SiO 2 -3CaO·P 2 o 5 Phosphorus-rich phase, cooled and precipitated to recover P element, so that the whole treatment process is in a smelting state where Fe is reduced and P is not reduced. It can only be in a weakly reducing atmosphere that seems to have an oxidizing atmosphere under blowing oxidizing gas. Therefore, electric heating is used to provide heat source, stirring and mixing to strengthen the treatment process, thereby affecting the reduction rate of iron, and may be in a dilemma in controlling the reduction or non-reduction between iron and phosphorus, and the oxidizing or reducing atmosphere of the treatment is relatively Difficult to control

2. In order to achieve the technical effect or purpose of "production of molten iron, silicon-rich calcium phase and phosphorus-rich phase" as described in the patent "realize efficient recovery of iron, silicon, calcium, and phosphorus components in mixed slag", the process plan adopts "Two-step method" treatment, in the last second step "slag-gold separation stage for separation and reuse", not only is forced to adopt a variety of sedimentation methods, but also highlights the oxidation treatment of the separated slag by blowing oxygen to improve the slag Iron oxide content ≥ 2wt%, in order to improve its value as cement clinker of standard quality, even so, the value of slag as cement raw material is still not too high, time-consuming and laborious, and the cost of slag conversion into cement raw material is relatively high High, there are certain problems in the economy, although phosphorus resources are precious, the phosphorus-rich phase recovered by this process is also limited

Due to discontinuous treatment, one furnace is processed by heating and smelting, and the slag is cleaned up after separation. The heat loss of the empty furnace is added to heat up and smelt, and then the furnace is reprocessed, and then cooled and settled for separation. Intermittent discontinuous processing production method is too cumbersome and difficult to master. It is not suitable for large-scale and mass industrial production organizations. Especially the electric heating method is adopted, which consumes high power costs. It is expected that this process will be used to mine low-value steel slag or blast furnace slag It is not of great significance to increase the value of steel slag or blast furnace slag as cement clinker

Images