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Low-carbon treatment method of ardealite in pyrometallurgy of nonferrous metal

A non-ferrous metal and phosphorus disposal technology, applied in the field of non-ferrous metal pyrometallurgy, can solve the problems of high total phosphorus content of phosphogypsum, high energy consumption, large-scale production, difficulty in acid production, etc., achieve low investment, reduce greenhouse gas emissions, low cost effect

Inactive Publication Date: 2015-06-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, since the 1970s, people have carried out a lot of research and development on the production of sulfuric acid and cement from phosphogypsum, but the quality of the cement cannot meet the standard due to the high content of total phosphorus and free CaO, and the SO in the flue gas 2 Due to the low concentration, it is difficult to make acid, and the high energy consumption has not been able to achieve large-scale production.
Recently, the WTP wet-process phosphoric acid production process introduced from the United States can solve the problem of high total phosphorus content in phosphogypsum. Free CaO , CaS and SO 3 Basic research has been carried out on the control of the control, but special Phosphogypsum Treatment plants, including acid and cement production systems, require substantial investment and land
At present, there is no relevant literature report on phosphogypsum as a calcium-containing flux in non-ferrous smelting

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The chemical composition of copper sulfide concentrate is (wt%): Cu18.16, Fe 29.05, S31.41, SiO 2 7.44, CaO 1.53, MgO 0.77, Pb 0.88, Zn2.56, As 0.35; the chemical composition of phosphogypsum is (wt%): CaO 38.10, SO 3 43.59, SiO 2 14.47 Fe 2 o 3 0.26,P 2 o 5 1.54, Al 2 o 3 0.38; The chemical composition of the returned converter slag is (wt%): CaO 0.4, SiO 2 24.17, Fe 47.42, Cu 3.25, S 1.93, Zn 1.76. In this embodiment, converter slag and quartz sand are used as auxiliary materials, and the main components used for oxygen-enriched matte smelting are: Fe30.95wt%, SiO 2 34.60wt%, CaO10.63wt% ternary slag; according to the component content and processing capacity of copper sulfide concentrate, the component content and processing capacity of auxiliary materials, and the main component content of the designed slag, calculate the slagging agent that needs to be added The amount of calcium, after calculating the amount of phosphogypsum according to the amount o...

Embodiment 2

[0031] The main components of the slag of copper sulfide concentrate flash matte smelting are (wt%): Cu0.90wt%, Fe36.50wt% (the existing form and content are Fe 3 o 4 11.50wt%, FeO 38.96wt%), S1.00, SiO 2 33.60. The main components used in matte-making smelting electric furnace slag depletion are: Fe30.52wt%, CaO6.36wt% and SiO 2 31.60 wt% ternary slag; the amount of calcium to be added to the slagging agent was calculated according to the composition content and processing capacity of the liquid slag in the matte smelting smelting of copper sulfide concentrate and the main composition content of the designed electric furnace depletion slag. The amount of calcium added in the slagging agent and the calcium content of phosphogypsum, after calculating the amount of phosphogypsum, the electric furnace depletion operation at 1200°C; weigh 1000g of flash matte-making smelting slag, and mix it into Example 1 Phosphogypsum 184.4g of the composition is used to replace 147.84g of 8...

Embodiment 3

[0033] The main components of liquid matte are (wt%): Cu49.50wt%, Fe21.00wt%, S21.50wt%, Pb0.50wt%, Zn0.18wt%. The iron-calcium slag with CaO / Fe=0.37 (mass ratio) is used for matte continuous blowing; the calcium that needs to be added to the slagging agent is calculated according to the composition content and processing capacity of liquid matte and the main composition content of the designed slag According to the amount of calcium added in the slagging agent and the calcium content of phosphogypsum, after calculating the amount of phosphogypsum, weigh 1000g of the above-mentioned matte powder, and mix it into the phosphogypsum of the composition described in Example 1 203.94g, used to replace 173.44g of 80% grade limestone. Mix evenly; at a temperature above 1250°C, use 80% O 2 The oxygen-enriched air 269L is used for matte flash blowing. 395.7g of blister copper was obtained, and the direct copper recovery rate was 79.14%; the slag was 532.86g, containing Cu19.38 wt%, Ca...

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Abstract

The invention discloses a low-carbon treatment method of ardealite in pyrometallurgy of nonferrous metal, belonging to the technical field of pyrometallurgy. The method comprises the following steps of: using ardealite as a calcium-containing fusing agent in a slag former, calculating the addition of calcium in the slag former according to the contents and throughout of raw materials and auxiliary materials in a furnace and the designed contents of main components of the slag in pyrometallurgy of nonferrous metal, calculating the dosage of ardealite according to the addition of calcium in the slag former and the calcium content of ardealite, and finally performing pyrometallurgy of nonferrous metal at 1200-1250 DEG C. According to the method, special plants and equipment are not needed to be built, ardealite solid waste is treated incidentally during the existing pyrometallurgy of nonferrous metal, the oxidation reaction heat and by-product high-concentration SO2 smoke generated during the pyrometallurgy of nonferrous metal are fully used, and low-cost treatment of ardealite and efficient utilization of resource are realized.

Description

technical field [0001] The invention relates to a method for low-carbon disposal of phosphogypsum in pyrometallurgy of nonferrous metals, belonging to the technical field of nonferrous metal pyrometallurgy. Background technique [0002] Phosphorus chemical wet process produces one ton of P 2 o 5 It is necessary to produce 5 tons of phosphogypsum. The global annual output of phosphogypsum is nearly 200 million tons, and the domestic output is about 70 million tons per year. Phosphogypsum is a huge amount of industrial solid waste, which is facing the double pressure of land occupation and environmental protection; phosphogypsum is also a huge resource of sulfur and calcium, and my country is short of sulfur resources, such as sulfur imports account for more than two-thirds of the consumption. Although there are many ways to use phosphogypsum, such as directly using it as a raw material for building materials such as gypsum boards and gypsum blocks, compared with natural gyp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02
Inventor 唐朝波唐谟堂陈永明何静杨声海杨建广叶龙刚
Owner CENT SOUTH UNIV