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A method for preparing ultra-fine high-white micropowder by removing impurities from granite fine-grained stone powder at full-grain level

A granite and full-grain grading technology, applied in chemical instruments and methods, solid separation, grain processing, etc., can solve the problems of high equipment power and high energy consumption, and achieve the effects of increased yield, large sedimentation area, and high whiteness

Active Publication Date: 2021-01-22
ZHENGZHOU MINERALS COMPOSITIVE UTILIZATION RES INST CHINESE GEOLOGICAL ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the lower limit of the existing high-gradient vertical ring magnetic separator and slurry electromagnetic magnetic separator is 20 μm, which is ineffective for sawing mud below -20 μm, and the power of the stand-alone equipment is large, and the energy consumption is high.

Method used

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  • A method for preparing ultra-fine high-white micropowder by removing impurities from granite fine-grained stone powder at full-grain level
  • A method for preparing ultra-fine high-white micropowder by removing impurities from granite fine-grained stone powder at full-grain level
  • A method for preparing ultra-fine high-white micropowder by removing impurities from granite fine-grained stone powder at full-grain level

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Taking the solid waste sawing sludge from a granite stone mine in a certain place in Henan Province as the test object, the test product was tested by Foshan Ceramic Research Institute Testing Co., Ltd. 2 0: 3.18-4.06%, Na 2 0: 5.26-6.06%, Fe 2 0 3 : 2.15-2.83%, Al 2 o 3 : 16.26-18.38%, SiO 2 : 65.77-72.60%, TiO 2 : 0.12-0.44%, CaO: 2.07-2.77%, MgO: 0.09-0.65%, product particle size, D50=24.86μm, raw ore whiteness 6.5-8.6%, process flow chart of beneficiation is as follows figure 1 shown.

[0039] Slag separation classification: After the sample is classified to +40 mesh, the product is large particle impurities and coarse sand, and the concentration of the overflow pulp of the spiral classifier is adjusted to 25-30%;

[0040] Two-stage magnetic separation for impurity removal: the first-stage magnetic separation adopts a semi-countercurrent drum permanent magnet magnetic separator with a field strength of 0.6T, and the second-stage magnetic separation adopts a h...

Embodiment 2

[0048] Taking sesame white granite stone powder in a stone industrial park in Henan Province as the test object, the test product was tested by Foshan Ceramic Research Institute Testing Co., Ltd. The analysis of the sawn mud raw ore samples was calculated by mass percentage, and the K in the samples was 2 0: 3.36%, Na 2 0: 5.56%, Fe 2 0 3 : 2.17%, Al 2 o 3 : 17.16%, SiO 2 : 67.10%, TiO 2 : 0.37%, CaO: 2.77%, MgO: 0.58%, product particle size D50 = 12.34μm, raw ore whiteness 10.7, process flow chart as figure 2 shown.

[0049] Classification of slag separation: the sample is screened and graded + 40 mesh products are large particles of impurities and coarse sand, and the concentration of the selected ore pulp is adjusted to 25-30%; because the raw ore particle size is relatively fine, the content of the coarse particle is low, and the coarse particle is no longer classified. The first-stage magnetic separation adopts a semi-countercurrent magnetic separator with a field...

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Abstract

The invention provides a method for preparing superfine high-whiteness micro powder by removing impurities from granite fine-grained stone powder in a full-grained manner. The method comprises the following steps: (1) taking granite saw mud or stone powder as raw ore, firstly performing slag separation and classification on the raw ore to realize material scattering and removal of oversize particles, and then performing two-stage magnetic separation to remove mechanical iron impurities, mica and weak magnetic substances to obtain a non-magnetic substance; (2) performing fine classification onthe non-magnetic substance in the step (1) according to the particle size requirement to obtain a fine-grained product and a coarse-grained product; (3) performing high-field-intensity magnetic separation on the coarse and fine products respectively; and (4) preparing micro powder. According to the method, a pollution-free environment-friendly physical technology and a low-temperature superconducting magnetic separation technology are adopted, so that the technical problems of magnetic separation and iron removal of fine particles and energy conservation and consumption reduction of superfinepowder prepared by non-metal ore are solved, and large-scale consumption and high-value utilization after impurity removal and whitening of the granite saw mud and stone powder are realized. Comparedwith a traditional impurity removal and whitening process, the method has the advantages that the product whiteness is improved by 15 20 degrees, the yield is improved by 23 25%, and compared with a traditional process for preparing powder from ore, crushing and ore grinding are not needed.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of solid waste, in particular to a method for preparing superfine high-white micropowder by removing impurities at full-grain levels from fine-grained granite stone powder. Background technique [0002] my country's granite stone industry is mainly distributed in Nan'an, Fujian, Yunfu, Guangdong, Wulian, Laizhou, Henan, Biyang, Hubei, Macheng, Suizhou, Guangxi, Guangxi, Xinjiang Shanshan, Hami and other places. Saw mud is a mixture of stone powder and water produced in the process of granite stone mining, block cutting, and plate polishing, accounting for 5-7% of the total stone mining block. The output of fine powder particles recovered by negative pressure dust removal in the process accounts for 8-13% of the total processing capacity. This kind of fine-grained solid waste has many output points, a wide range, and a large amount. The annual increment of sawn mud solid waste ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B02C21/00B03C1/30
CPCB02C21/00B03C1/30
Inventor 彭团儿刘磊刘广学张艳娇郭珍旭赵恒勤
Owner ZHENGZHOU MINERALS COMPOSITIVE UTILIZATION RES INST CHINESE GEOLOGICAL ACAD
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