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A kind of smelting method of low-grade sulfur-containing zinc oxide ore

A technology of zinc oxysulfide and smelting methods, applied in chemical instruments and methods, sulfur compounds, preparation/purification of sulfur, etc., can solve problems such as high cost, low smelting recovery rate, poor economic value, etc.

Active Publication Date: 2020-09-11
六盘水中联工贸实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The optimized combination of technologies such as purification of tail gas and then spraying to meet the standard discharge has overcome the problems of low smelting recovery rate, high cost and poor economic value of sulfur-containing low-grade zinc oxide ore

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023] Example 1: A refractory zinc oxide ore contains 10.5% zinc, 1.75% lead, 13.7% silicon dioxide, 8.5% iron, 4.3% sulfur, 7.8% calcium oxide, and more than 30% soil. Its smelting steps are as follows:

[0024] 1. Wash 3 times with clean water at room temperature, filter and dry, and grind to 60 mesh.

[0025] 2. Add sulfur powder according to sulfur / zinc+iron=1.2, mix well and then granulate 1-2mm.

[0026] 3. In the small rotary kiln used in the laboratory, the diameter of the rotary kiln is 200*5000mm, the rotary kiln is heated by electricity, and the volatilization temperature is 1000°C.

[0027] 4. The rotary kiln adopts bag dust collection, and the dust collection exhaust gas enters the activated carbon column with microwave radiation connected between the outlet and the alkali spray pipe. The activated carbon column is 150*800mm in diameter, the microwave radiation frequency is 2.5GHz, and the power is 2.5kW. The tail gas was then washed with 5% sodium carbonate so...

example 2

[0030] Example 2: The sulfur-containing low-grade zinc oxide ore produced in a certain place contains 11.2% zinc, including 6.5% zinc oxide, 4.7% zinc sulfide, 0.92% lead (all lead sulfide), 6.72% iron, and 18.16% silicon dioxide , calcium oxide 27.2%, containing more than 50% soil. First wash with hot water at 30-40°C for 2-3 times. Then filter, dry, crush to about 140 mesh, mix with sulfur powder according to sulfur / zinc+iron=1, mix and granulate to 3-5mm, vulcanize and volatilize with rotary kiln. The burning natural gas is blasted from the head of the rotary kiln to provide heat, and the vulcanization temperature is controlled to be 900±50°C. The metal volatilization fumes are collected by pulse cloth bags. The dust-collecting tail gas passes through the activated carbon column with a diameter of 800*3000mm connected between the tail gas outlet and the tail gas spray tower inlet to purify the sulfur dioxide in the tail gas. The purified tail gas is discharged up to the s...

example 3

[0031]Example 3: use the sulfur-containing low-grade zinc oxide ore of example 2, use the laboratory equipment and conditions of example 1, use sodium sulfide as the vulcanizing agent, and carry out the test identically with example 1 for all the other conditions. The sulfidation volatilization rate of zinc was 87.5%, the oxygen pressure leaching rate was 88.2%, and the total recovery rate of elemental sulfur was 78.8%. The calculated economic index of using sodium sulfide as a vulcanizing agent is lower than that of elemental sulfur powder, mainly because sodium sulfide must be melted first, and then mixed. During drying, sulfur dioxide is produced and part of the elemental sulfur is lost, which reduces the proportion of elemental sulfur. .

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Abstract

The invention discloses a smelting method for low-grade sulfur-containing zinc oxide ore. The method comprises the following steps: smashing the low-grade sulfur-containing zinc oxide ore until 40 meshes or more, stirring and washing by using clear water, after filtering and desliming, mixing with a sulfur element, and performing sulfiding volatilization to obtain zinc sulfide volatile smoke dust;after dust collection, purifying a tail gas through an activated carbon column with microwave radiation, to obtain elemental sulfur which is returned to use, and discharging the purified tail gas; recycling zinc sulfate from the zinc sulfide smoke dust by using an oxygen pressure extracting technology, wherein the zinc sulfate is used for electrolyzing zinc, and returning the recycled elemental sulfur to use, wherein an addition amount of the sulfur element is 1-1.2 times of sulfur / zinc+iron, and the sulfur element is the elemental sulfur or sodium sulphide; and uniformly mixing, and pelletizing in 1-5 mm. The beneficial effect of the method is that mineral separation enrichment is not performed on the incompletely oxidized low-grade sulfur-containing zinc oxide ore, and the zinc sulfideand the zinc oxide in the low-grade sulfur-containing zinc oxide is enriched and recycled through volatilization.

Description

technical field [0001] The invention belongs to the field of nonferrous metallurgy, and specifically relates to the process of washing sulfur-containing low-grade zinc oxide ore, mixing sulfur elements, volatilizing and volatilizing in a rotary kiln or fuming furnace, collecting dust, leaching with high temperature oxygen pressure, recovering zinc sulfate and elemental sulfur and A method for purifying dust-collecting tail gas by activated carbon microwave radiation and recovering elemental sulfur. Background technique [0002] The basic reserves and current exploitable reserves of middle and low-grade zinc deposits in my country account for 77.15% and 74.32% of the national zinc deposits respectively. However, at present, low-grade zinc oxide ore, especially zinc oxide ore with a zinc content of less than 10% and a sulfur content of about 5%, has a low resource utilization rate and a serious waste of resources. The main reason is that the beneficiation of this type of zinc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B19/20C25B1/00C25C1/16C01B17/04
CPCC01B17/0482C22B19/20C25B1/00C25C1/16Y02P10/20
Inventor 李世平钟波
Owner 六盘水中联工贸实业有限公司
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