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Method and device for producing gypsum from acid solution in zinc smelting

An acid solution, zinc smelting technology, applied in the direction of calcium/strontium/barium sulfate, etc., can solve the problems of large pressure filtration workload, poor sedimentation effect, insufficient reaction, etc., to increase the workload, improve the supernatant rate, The effect of improving settling performance and settling effect

Active Publication Date: 2018-06-22
YUNNAN HUALIAN ZINC & INDIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the existing acid-containing solution neutralization treatment process of zinc smelting, there are poor sedimentation effect, heavy pressure filtration workload, low supernatant rate (about 20%-30%), CaCO 3 Defects of insufficient reaction and low quality of gypsum

Method used

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  • Method and device for producing gypsum from acid solution in zinc smelting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] The sulfuric acid concentration of the acid-containing solution is 48 g / L, and the acid-containing solution is pumped into the first neutralization tank 1031 through the first metering pump 1041 . According to the sulfuric acid concentration of acid-containing solution, the flow rate of the second metering pump 1042 is adjusted to regulate the addition of calcium carbonate emulsion, and the sulfuric acid concentration in the first neutralization tank 1031 is maintained to be 30g / L. During the reaction, gypsum seeds were added at 5 g / L. After reacting for 60 minutes at a stirring speed of 300r / min-500r / min and a temperature of 80°C-85°C, it enters the second neutralization tank 1032 through the first chute 1071 .

[0063] Adjust the flow velocity of the third metering pump 1043 to regulate the addition of this calcium carbonate emulsion, and keep the sulfuric acid concentration in the second neutralization tank 1032 as 10g / L. After reacting for 60 minutes at a stirring sp...

Embodiment 2

[0066] The sulfuric acid concentration of the acid solution is 55g / L. The acid-containing solution is pumped into the first neutralization tank 1031 through the first metering pump 1041 . According to the sulfuric acid concentration of acid-containing solution, the flow rate of the second metering pump 1042 is adjusted to regulate the addition of calcium carbonate emulsion, and the concentration of sulfuric acid in the first neutralization tank 1031 is maintained to be 28g / L. During the reaction, gypsum seeds were added at 8 g / L. After reacting for 30 minutes at a stirring speed of 300r / min-500r / min and a temperature of 80°C-85°C, it enters the second neutralization tank 1032 through the first chute 1071 .

[0067] Adjust the flow rate of the third metering pump 1043 to regulate the addition of the calcium carbonate emulsion, and keep the sulfuric acid concentration in the second neutralization tank 1032 as 13g / L. After reacting for 30 minutes at a stirring speed of 300r / min...

Embodiment 3

[0070] The sulfuric acid concentration of the acid solution is 60g / L. The acid-containing solution is pumped into the first neutralization tank 1031 through the first metering pump 1041 . According to the sulfuric acid concentration of acid solution, adjust the flow rate of the second metering pump 1042 to regulate the addition of calcium carbonate emulsion, keep the sulfuric acid concentration in the first neutralization tank 1031 as 40g / L. During the reaction, gypsum seeds were added at 3 g / L. After reacting for 90 minutes at a stirring speed of 300r / min-500r / min and a temperature of 80°C-85°C, it enters the second neutralization tank 1032 through the first chute 1071 .

[0071] Adjust the flow rate of the third metering pump 1043 to regulate the addition of the calcium carbonate emulsion, keeping the sulfuric acid concentration in the second neutralization tank 1032 as 7g / L. After reacting for 90 minutes at a stirring speed of 300r / min-500r / min and a temperature of 85°C-9...

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Abstract

The invention discloses a method and device for producing gypsum from a zinc smelting acid-containing solution. The method for producing gypsum from a zinc smelting acid-containing solution includes the following steps that an acid-containing solution and calcium carbonate emulsion are mixed, gypsum seed crystals are added, and first-stage neutralization, second-stage neutralization and third-stage neutralization are carried out on the acid-containing solution, wherein the difference between the sulfuric acid concentration of a mixture of the acid-containing solution obtained after first-stage neutralization and the calcium carbonate emulsion, the sulfuric acid concentration of a mixture obtained after second-stage neutralization and the sulfuric acid concentration of a mixture obtained after third-stage neutralization is larger than or equal to 5 g / L; solid-liquid separation is carried out on gypsum ore pulp. The device for producing gypsum from the zinc smelting acid-containing solution comprises an acid-containing solution storage tank, a calcium carbonate emulsion storage tank, a first detector, a first neutralization tank, a second neutralization tank, a third neutralization tank, a controller and a solid-liquid separation device, wherein the first neutralization tank, the second neutralization tank and the third neutralization tank are communicated in sequence. By means of the method and device for producing gypsum from the zinc smelting acid-containing solution, gypsum with a large particle size and good quality can be produced, and the settling property and settling effect of gypsum can be improved.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a method and a device for producing gypsum from zinc smelting acid solution. Background technique [0002] CaCO 3 or Ca(OH) 2 Neutralized gypsum produced by neutralizing free sulfuric acid is widely used in non-ferrous metal smelting industry, and the output is very large. At present, as the main way to deal with this kind of neutralized gypsum on a large scale, it is still used in the cement industry, that is, as a cement retarder in the cement production process, to adjust and control the setting time of cement, and to promote the formation of tricalcium silicate and silicon in cement. The hydration of dicalcium acid minerals can improve the early strength of cement and balance the strength of different ages. Because the particle size of this kind of neutralized gypsum is too fine, the application of this kind of neutralized gypsum is very limited for the plastering industry and gy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/46
CPCC01F11/46
Inventor 尹华光王私富曹元庆牛辉姚应雄朱北平张庆丰王邦伟周大国周坤潘辉王亚
Owner YUNNAN HUALIAN ZINC & INDIUM