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Method for preparing aerated concrete by utilizing lead zinc tailings

An air-entrained concrete and lead-zinc technology is applied in the field of preparing new porous thermal insulation building wall materials, which can solve the problems of low quartz content, and achieve the effects of reducing the settling speed, improving the pore structure and reducing the density.

Inactive Publication Date: 2013-10-09
JIANGSU EAST CHINA MINE TAILINGS MANAGEMENT ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the utilization of aerated concrete with low quartz content, especially at 15%-20%, has not been reported yet.

Method used

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  • Method for preparing aerated concrete by utilizing lead zinc tailings
  • Method for preparing aerated concrete by utilizing lead zinc tailings
  • Method for preparing aerated concrete by utilizing lead zinc tailings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: Combining image 3 , See Table 3 for the mixture ratio.

[0037] Table 3 Embodiment 1 Mixture ratio

[0038]

[0039] Step 1: Add 25 kg of water, 4.35 kg of 4wt% PVA solution, 15 kg of quartz sand powder, 5 kg of diatomaceous earth, 15 kg of lead-zinc tailings (1), 1.5 kg of gypsum and 5.5 kg of cement in sequence Stir in the bucket for 5min;

[0040] Step 2: After adding 0.1 kg of polycarboxylate superplasticizer, add 19 kg of lime and stir for 5 minutes;

[0041] Step 3: Add a mixed solution of 0.08 kg of aluminum powder and 0.025 kg of foam stabilizer sodium dodecylbenzene sulfonate into the slurry and stir for 3 minutes;

[0042] Step 4: Pour the slurry into the mold;

[0043] Step 5: Put the mold into a thermal curing kiln at 50°C for static maintenance;

[0044] Step 6: After 3-5 hours of static maintenance, demould, and cut the aerated concrete body;

[0045] Step 7: After cutting, continue to put it into the thermal curing kiln at 50°C for st...

Embodiment 2

[0047] Example 2: Combining image 3 The mixture ratio is shown in Table 4.

[0048] Table 4, embodiment 2 mixture ratio

[0049]

[0050] Step 1: Add 25 kg of water, 8.7 kg of PVA solution, 15 kg of quartz sand powder, 5 kg of diatomaceous earth, 15 kg of lead-zinc tailings (1), 1.5 kg of gypsum and 7 kg of cement into the bucket in sequence and stir 5min;

[0051] Step 2: After adding 0.1 kg of water reducer, add 8 kg of lime and stir for 5 minutes;

[0052] Step 3: Add the mixed solution of 0.08 kg of aluminum powder and 0.025 kg of foam stabilizer to the slurry and stir for 3 minutes;

[0053] Step 4: Pour the slurry into the mold;

[0054] Step 5: Put the mold into the thermal curing kiln at 50°C for static maintenance;

[0055]Step 6: After 3-5 hours of static maintenance, demoulding and cutting of the aerated concrete body;

[0056] Step 7: After cutting, continue to put it into the thermal curing kiln at 50°C for static maintenance;

[0057] Step 8: Carry out...

Embodiment 3

[0058] Example 3: Binding image 3 The mixture ratio is shown in Table 5.

[0059] Table 5, embodiment 3 mixture ratio

[0060]

[0061] Step 1: Add 25 kg of water, 17.4 kg of PVA solution, 15 kg of quartz sand powder, 5 kg of diatomaceous earth, 15 kg of lead-zinc tailings, 1.5 kg of gypsum and 7 kg of cement into the bucket in order and stir for 5 minutes;

[0062] Step 2: After adding 0.1 kg of water reducer, add 8 kg of lime and stir for 5 minutes;

[0063] Step 3: Add the mixed solution of 0.08 kg of aluminum powder and 0.025 kg of foam stabilizer to the slurry and stir for 3 minutes;

[0064] Step 4: Pour the slurry into the mold;

[0065] Step 5: Put the mold into the thermal curing kiln at 50°C for static maintenance;

[0066] Step 6: After static maintenance for 3-5 hours, demoulding and cutting of aerated concrete body;

[0067] Step 7: After cutting, continue to put it into the thermal curing kiln at 50°C for static maintenance;

[0068] Step 8: Carry out a...

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Abstract

The invention discloses a method for preparing aerated concrete by utilizing lead zinc tailings. A part of quartz contained in the lead zinc tailings is utilized; silica in the part and calcium hydroxide can be subjected to hydro-thermal synthesis; a part of ultra-fine silicate minerals are taken as the lead zinc tailings of micro aggregates to be well combined with hydrated calcium silicate, so that the strength of silicate aerated concrete is enhanced. A part of fine quartz sand is doped, so that the defects that the quartz content namely the silica content is not enough in the lead zinc tailings are compensated; the content of the hydrated calcium silicate in hydro-thermal synthesis can be improved; the physical properties of the silicate product of the lead zinc tailings are improved. The density of the lead zinc tailings is high; the formed slurry is fast in sedimentation velocity, and isolated, so that the aeration stability of the aerated concrete of the lead zinc tailings is affected; the viscosity and the fluidity of the slurry are adjusted by adding polyvinyl alcohol (PVA) and milling diatomite; the sedimentation velocity is reduced; the aeration is smooth, so as to reduce the density of the product. By using a novel water reducer and a foam stabilizer, the pore structure is improved; the compressive strength of the product is also improved.

Description

technical field [0001] The invention belongs to the field of resource utilization of inorganic solid waste. The invention is applicable to the comprehensive utilization of lead-zinc tailings, and is a method for preparing a novel porous heat-insulating building wall material by utilizing lead-zinc tailings with low quartz content and high density. Background technique [0002] Lead-zinc tailings are powdery waste slag discharged after lead-zinc ore beneficiation. Generally, medium-scale lead-zinc beneficiation plants discharge about 100,000-300,000 tons of tailings annually. The discharge of lead-zinc tailings is large, and now the method of stacking is generally adopted, which requires a large amount of farmland and pollutes nearby rivers. Therefore, the comprehensive utilization of lead-zinc tailings is imperative. [0003] There are more than 150 kinds of lead ore in nature, but the main mining value is only galena (PbS), white lead ore (PbCO 3 ), there are more than 50 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B38/02
Inventor 崔晓昱杨秀丽倪青林白海静秦璜郭伟孙巍巍崔崇
Owner JIANGSU EAST CHINA MINE TAILINGS MANAGEMENT ENG
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