Method for comprehensively utilizing calcium and sulfur resources of industrial gypsum

A technology for industrial gypsum and resources, which is applied in the comprehensive utilization of sulfur resources, smelting slag, and calcium in industrial gypsum. It can solve the problems of blocking purification equipment and destroying the normal operation of electric demisters, etc., and achieves the effect of efficient utilization.

Active Publication Date: 2020-06-16
BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Production of sublimated sulfur will reduce SO in flue gas 2 If the concentration is serious, i

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The industrial gypsum is dried and dehydrated until the water content is 6%, mixed with coal according to the molar ratio of carbon to sulfur of 0.5, and finely ground, of which the particle size is less than 0.074mm accounting for 75%. Mix the finely ground powder for low-temperature reduction roasting, control the temperature at 750°C, and take 60 minutes to obtain CaSO converted into CaS 4 Accounting for 30% semi-reduced products. According to the theoretical calculation ratio of calcium flux required for CaO mass accounting for 1.5% of the copper concentrate, the semi-reduced product is mixed into the copper concentrate, and the temperature of copper oxygen-enriched flash smelting is above 1200°C and the oxidizing atmosphere meets the requirements of CaSO 4 Reaction with CaS required. The sulfur dioxide produced by the reaction increases the concentration of sulfur dioxide in the flue gas produced by copper concentrate smelting by 1%, which is beneficial to the pro...

Embodiment 2

[0049] The industrial gypsum is dried and dehydrated until the water content is 8%, mixed with coal according to the molar ratio of carbon to sulfur of 0.7, and finely ground, of which 80% have a particle size of less than 0.074mm. Mix the finely ground powder and perform low-temperature reduction roasting at a controlled temperature of 800°C for 30 minutes to obtain CaSO converted to CaS 4 Accounting for 28% of semi-reduced products. According to the theoretical calculation ratio of calcium flux required for CaO mass accounting for 2.0% of the copper concentrate, the semi-reduced product is mixed into the copper concentrate, and the temperature of copper oxygen-enriched flash smelting is above 1200°C and the oxidizing atmosphere meets the requirements of CaSO 4 Reaction with CaS required. The sulfur dioxide produced by the reaction increases the concentration of sulfur dioxide in the flue gas produced by copper concentrate smelting by 1.4%, which is beneficial to the product...

Embodiment 3

[0051] The industrial gypsum is dried and dehydrated until the water content is 10%, mixed with coal according to the molar ratio of carbon to sulfur of 1.1, and finely ground, of which 82% have a particle size of less than 0.074mm. Mix the finely ground powder for low-temperature reduction roasting at a controlled temperature of 950°C for 20 minutes to obtain CaSO converted to CaS 4 Accounting for 40% semi-reduced products. According to the theoretical calculation ratio of calcium flux required for the mass of CaO to account for 3.0% of the copper concentrate, the semi-reduced product is mixed into the copper concentrate, and the temperature of the copper oxygen-enriched flash smelting is above 1200°C and the oxidizing atmosphere meets the requirements of CaSO 4 Reaction with CaS required. The sulfur dioxide generated by the reaction increases the concentration of sulfur dioxide in the flue gas produced by copper concentrate smelting by 2%, which is beneficial to the product...

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Abstract

The invention discloses a method for comprehensively utilizing calcium and sulfur resources of industrial gypsum, and belongs to the technical field of comprehensive utilization of solid waste resources of industrial gypsum. The method is based on a calcium sulfate pyrolytic reaction mechanism and copper and lead nonferrous metal smelting industrial production conditions; industrial gypsum low-temperature semi-reduction is provided to generate a mixture of CaSO4 and CaS; the prepared semi-reduction product is applied to the flash smelting process of non-ferrous metals such as copper and lead,achieving organic combination with a non-ferrous smelting process; sulfur dioxide generated by high-temperature pyrolysis of CaSO4 and CaS in the semi-reduction product can improve the concentration of sulfur dioxide in a smelting system, a sulfuric acid product is prepared, calcium oxide provides a slagging flux required by smelting, and efficient utilization of industrial gypsum sulfur-calcium resources is achieved. According to the method, the industrial gypsum is digested without generating secondary waste residues, and meanwhile, the calcium and sulfur resources can be fully and reasonably utilized.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of industrial gypsum solid waste resources, and in particular relates to a method for comprehensive utilization of calcium and sulfur resources in industrial gypsum, especially the recycling and utilization of sulfur in industrial gypsum in copper and lead pyrometallurgy, and Calcium undergoes slagging reaction to form smelting slag. The organic combination of industrial gypsum solid waste and copper, lead and other non-ferrous smelting processes not only comprehensively utilizes the calcium and sulfur resources in gypsum, but also improves the smelting behavior of copper and lead. Background technique [0002] Industrial gypsum refers to the CaSO 4 It is the by-product of the main component, mainly including phosphogypsum, desulfurization gypsum, fluorine gypsum and gypsum formed by acid wastewater treatment. [0003] There are three main ways to utilize industrial by-product ...

Claims

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Application Information

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IPC IPC(8): C01F11/46C01B17/44C01B17/74C01F11/02C22B13/02C22B15/00
CPCC01F11/46C01B17/44C01B17/74C01F11/02C22B13/02C22B15/0047Y02P10/20
Inventor 范艳青刘巍
Owner BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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