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Full utilization method for middle and low-grade pyrite

A pyrite and low-grade technology, which is applied in the field of comprehensive utilization of medium and low-grade pyrite to produce acid, can solve the problems of tailings and mineral processing wastewater pollution, reduce equipment purchases and technological processes, save resources, and reduce economic burdens Effect

Inactive Publication Date: 2014-02-19
SIKEFENG LUZHOU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to aim at the deficiencies in the prior art, and provide a kind of method of fully utilizing middle and low-grade pyrite, which fully utilizes the raw ore of middle and low grade pyrite, and solves the problems in the pyrite acid production process. Pollution problems of tailings and mineral processing wastewater, while increasing the burning rate of pyrite, achieving the goal of low sulfur content in cinder, and providing a strong guarantee for the further utilization of cinder

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  • Full utilization method for middle and low-grade pyrite

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Effect test

Embodiment 1

[0014] Embodiment 1: adopt the pyrite ore of Xuyong County, Luzhou City, Sichuan Province, the sulfur content of the raw ore is 15-18%, and the water content is below 3%. Put the raw ore directly into the ball mill, adjust the air volume of the fan, control the fineness of the ground ore powder to 50 mesh, and transport the ore powder to the finished product bin of the fluidized fluidized furnace. The ore powder in the silo is continuously conveyed into the fluidized fluidized furnace which is already in a burning state through a closed conveying mechanism, the furnace bottom pressure is controlled at 10-12KPa, the furnace temperature is 750-850°C, and the water color is controlled to be brownish black. The sulfur dioxide gas produced is sent to the subsequent section to produce sulfuric acid according to the conventional pyrite acid production process. The slag is collected from the lower slag outlet of fluidized fluidized furnace, boiler, cyclone dust collector and electrost...

Embodiment 2

[0015] Embodiment 2: adopt the pyrite ore of Xingwen County, Yibin City, Sichuan Province, the sulfur content of the raw ore is 15-18%, and the water content is about 5%. Firstly, the raw ore is dried until the moisture is 2%-3%, and the heat of drying comes from the waste heat generated from the production of sulfuric acid. Then put the dried raw ore into the ball mill, adjust the air volume of the fan, control the fineness of the ground mineral powder to 60 mesh, and transport the mineral powder to the finished product bin of the fluidized fluidized furnace. The ore powder in the silo is continuously conveyed into the fluidized fluidized furnace which is already in a burning state through a closed conveying mechanism, the furnace bottom pressure is controlled at 10-12KPa, the furnace temperature is 750-850°C, and the water color is controlled to be brownish black. The sulfur dioxide gas produced is sent to the subsequent section to produce sulfuric acid according to the conv...

Embodiment 3

[0016] Embodiment 3: adopt the pyrite of Dafang County, Guizhou Province, the sulfur content of the raw ore is 17-20%, and the water content is below 3%. Put the raw ore directly into the ball mill, adjust the air volume of the fan, control the fineness of the ground ore powder to 70 mesh, and transport the ore powder to the finished product bin of the fluidized fluidized furnace. The ore powder in the silo is continuously conveyed into the fluidized fluidized furnace which is already in a burning state through a closed conveying mechanism, the furnace bottom pressure is controlled at 10-12KPa, the furnace temperature is 750-850°C, and the water color is controlled to be brownish black. The sulfur dioxide gas produced is sent to the subsequent section to produce sulfuric acid according to the conventional pyrite acid production process. The slag is collected from the lower slag outlet of fluidized fluidized furnace, boiler, cyclone dust collector and electrostatic precipitator...

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Abstract

The invention discloses a full utilization method for middle and low-grade pyrite. The method comprises the following steps: (1) after full-thickness pyrite is exploited, controlling the moisture of the pyrite to be 2-3%, crushing, and grinding the pyrite until the fineness is 50-70 meshes to obtain pyrite powder; (2) adding the crushed pyrite powder to a fluidized bed furnace for roasting to obtain sulfur dioxide gas and slag; (3) preparing sulfuric acid or sulfur by the sulfur dioxide gas; (4) conducting magnetic separation on the slag to obtain fine iron power and waste residue, wherein the total sulfur content of the fine iron power is 0.5-0.7%, directly using the fine iron power as a steel making raw material, and using the waste residue as an admixture for cement concrete. The full utilization method takes full use of the middle and low-grade pyrite, solves the pollution problem of tailings and beneficiation wastewater during the acid preparing process by pyrite, meanwhile improves the burn-out rate of the pyrite, achieves the purpose of low sulfur content of the slag, and provides a powerful guarantee for further utilizing the slag.

Description

technical field [0001] The invention relates to a method for making acid by fully utilizing middle and low grade pyrite. Background technique [0002] Pyrite is the most important sulfur resource in my country and is mainly used for the production of sulfuric acid. my country is rich in pyrite resources, accounting for 10% of the world's total reserves, ranking third, but most of them are low-grade or medium-grade. At present, after the low-grade pyrite is mined, it must be crushed, re-selected or flotation to produce sulfur concentrate with a sulfur content of 35-48%, and then the sulfur concentrate is roasted in the furnace to produce sulfuric acid. One of the biggest disadvantages of this acid production method is that a large amount of tailings and beneficiation wastewater will not be treated during the production of sulfur concentrate, which not only wastes valuable mineral resources, but also causes serious pollution to the environment. [0003] Chinese patent CN1014...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/00C22B1/02C04B18/04
CPCY02P10/20Y02W30/91
Inventor 涂良策段志勇
Owner SIKEFENG LUZHOU CHEM CO LTD
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