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Method for preparing high-performance cementing material from modified calcium-magnesium phosphate rock tailings

A technology of phosphate rock tailings and cementitious materials, which is applied in cement production, flotation, solid separation, etc., and can solve problems such as restricting the development of enterprises, geological disasters of tailings ponds, high costs of tailings pond construction and operation management, etc. , to achieve the effect of reducing inventory pressure, increasing consumption, and good social and ecological environmental protection benefits

Active Publication Date: 2020-05-12
湖北冶金地质研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Tailings are a misplaced resource. Tailings contain various metal and non-metallic minerals that have not been fully extracted, rare scattered elements, and a large amount of mineral materials such as silicon, aluminum, calcium and magnesium that can be used; Stockpiling, occupying a large amount of land, causing environmental pollution such as dust and eutrophication of water bodies, and the tailings pond has potential geological disaster risks; the construction, operation and management of tailings ponds are expensive, which seriously restricts the development of enterprises

Method used

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  • Method for preparing high-performance cementing material from modified calcium-magnesium phosphate rock tailings
  • Method for preparing high-performance cementing material from modified calcium-magnesium phosphate rock tailings
  • Method for preparing high-performance cementing material from modified calcium-magnesium phosphate rock tailings

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Experimental program
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Effect test

Embodiment 1

[0014] (1) After washing, separating, and demedicating the phosphorous tailings sample, separate out the slime below 20 μm (the slime below 20 μm is called raw material 1) and the slime above 20 μm, and the yield of +20 μm is 85%, and it is dried for use ;

[0015] (2) For the part above 20 μm, adopt the technological process of first flotation magnesium (one coarse one fine one sweep) and then flotation phosphorus (one rough one fine) to divide the phosphorus tailings into three parts: magnesium-calcium component, Phosphorous component, silicon component (silicon component is the raw material 2); the selected magnesium-calcium component and phosphorus component are used for other purposes, and the silicon component is combined with some magnesium-calcium products and ultra-fine-grained phosphorus tail The ore is used in the preparation of phosphorous tailings-based cementitious materials. Among them, magnesium roughing agent system: sulfuric acid 6000g / t, collector TG 1500g / ...

Embodiment 2

[0032] Phosphorus tailings are treated by water analysis method, and the yield of +20μm is 80%. The flotation test is carried out on this product, and the technological process is to first flotation magnesium (one rough, one fine, one sweep) and then flotation phosphorus (one rough, one fine). Among them, magnesium roughing agent system: sulfuric acid 7000g / t, collector TG 2000g / t; magnesium selective agent system: collector TG 800g / t; magnesium sweeping agent system: sulfuric acid 800g / t, collector TG600g / t t. Phosphorus roughing agent system: sodium carbonate 10000g / t, collector TP 2500g / t; phosphorus sweeping agent system: sodium carbonate 1000g / t. The calcium and magnesium component yield was 60%, the MgO grade was 26.4%, and the CaO grade was 38.04%; the phosphorus component yield was 8%, and the P 2 o 5 The grade is 19.8%; the silicon component yield is 32%. The magnesium-calcium component was calcined at 900°C for 1.5h, then hydrated and refined, and the lower-purity...

Embodiment 3

[0046] The prepared cementitious material and ISO standard sand are mixed evenly in a cement mortar mixer according to the cement mortar ratio of 1:3, and then put into the mold. Three sets of tests are done for each formula, and then placed in a constant temperature and humidity curing box for curing. time. Determination of relative strength performance at a certain age.

[0047] Table 12 P1, P2 cementitious material flexural compressive strength

[0048]

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Abstract

The invention provides a method for preparing a high-performance cementing material from modified calcium-magnesium phosphate rock tailings. The method comprises the following steps: separating out aphosphate tailing sample with the particle size of 20 [mu]m or less for later use; sequentially carrying out magnesium flotation and phosphorus flotation on slime with the particle size of 20 [mu]m orabove, and dividing the slime into three parts, namely a magnesium-calcium component, a phosphorus component and a siliceous component; calcining the magnesian component, stirring and mixing the partof which the MgO grade is lower than 20%, the siliceous component and slime of which the particle size is less than 20 [mu]m, and aging and calcining to obtain clinker; and cooling the calcined clinker to room temperature under a dry condition, adding silica fume, mineral powder, carbide slag, sodium metaaluminate, polyaluminium chloride and a water reducing agent modifier, and preparing the cementing material at a certain water-cement ratio. The phosphate tailings are treated and then combined with different components to obtain the phosphate tailing-based cementing material, so that industrial solid wastes which are the phosphate tailings are changed into a characteristic resource and are completely and comprehensively utilized, the purpose of zero emission of the phosphate tailings isachieved, and green development and sustainable development of phosphorus chemical enterprises are promoted.

Description

technical field [0001] The invention relates to a method for preparing high-performance cementitious materials from modified calcium-magnesium phosphate ore tailings, which is a method for siliceous components and ultra-fine tailings in industrial solid waste phosphate ore tailings produced by phosphorus chemical industry. A kind of comprehensive utilization method, combined with the relevant process supporting the present invention can fundamentally eliminate the industrial solid waste produced by phosphorus chemical production, and solve the environmental management problems of phosphorus chemical enterprises. Background technique [0002] Phosphate rock is a non-renewable resource, and it is the most dependent and important non-metallic mineral in human production and life. Most of the phosphate rocks in my country are medium and low-grade collophosphine, which cannot be directly used in the production of phosphorus chemical industry. They need to be processed through min...

Claims

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Application Information

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IPC IPC(8): C04B7/24C04B7/14C04B7/153C04B7/38C04B7/44C04B35/66C04B35/626B03D1/00
CPCC04B7/243C04B7/14C04B7/153C04B7/38C04B7/44C04B35/62645C04B35/62605C04B35/62204C04B35/66B03D1/00C04B2235/3206Y02P40/10
Inventor 张晋贺爱平秦元奎郭茂生李国栋胡修权尤大海
Owner 湖北冶金地质研究所
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