Method for comprehensive utilization of red mud, phosphogypsum and coal gangue

A technology of phosphogypsum and coal gangue, which is applied in the field of comprehensive utilization of industrial waste, can solve the problems of poor solidification and stability of alkali and harmful metal ions, difficulties in controlling the color, strength and yield of ceramics, and the characteristics and fluctuations of the chemical composition of red mud. and other issues, to achieve the effect of good investment economy, favorable promotion, and small investment

Active Publication Date: 2014-10-01
长沙紫宸科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] 3. After the red mud is dried, add cement, lime, etc. to grind to produce mine cemented filling cementitious materials; in addition to stockpiling dry and hardened red mud, red mud drying consumes a lot of energy, and the produced mine cemented filled cementitious materials The solidification and stabilization effect of the alkali and harmful metal ions in the solution is extremely poor, and actually still pollutes the groundwater
[0012] 6. Chemically combine ceramic composite materials, use red mud dry powder after removing impurities, drying, and grinding to replace part of the porcelain mud materials, and prepare ceramic composite materials. The energy consumption of removing impurities, drying, and grinding is high. The characteristics and fluctuations of the chemical composition of mud make it difficult to control the color, strength and yield of ceramics, resulting in a substantial increase in the cost of qualified products
[0013] 7. Insulation and refractory materials: replace part of the refractory mortar with the red mud after removal of impurities, drying and grinding to fire refractory materials, or use red mud powder, refractory lightweight aggregate and refractory mortar that have been treated with removal of impurities, drying and grinding Add foaming agent to roast to produce thermal insulation refractory material, because the melting point of red mud itself is relatively low, and the energy consumption of removing impurities, drying and grinding is relatively high, but no substantial breakthrough has been made
Coal gangue in coal mining enterprises has already piled up like a mountain, causing secondary disasters continuously, and even the government subsidy of 100 yuan / ton is difficult to effectively deal with

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Raw materials: Red mud sintering method (naturally drained, moisture content 38.3 wt%), primary fine powdered phosphogypsum, coal gangue (average low calorific value 942kcal / kg) and high-sulfur coal (total sulfur content 7.8) wt%) and chromium residue.

[0041] 6700kg of red mud, 1100kg of phosphogypsum, 1700kg of coal gangue and 500kg of correction materials (230kg of high-sulfur coal, 270kg of chromium slag) are prepared according to a two-stage batching process to prepare homogeneous wet materials: one-stage batching process: 1700kg of coal gangue (Particle size≤40mm), 270kg of chromium slag (particle size≤30mm) and 230kg high-sulfur coal (particle size≤30mm) ingredients, after Raymond milling to produce 80μm sieve residue <15% qualified powder 2200kg; Grade batching process: mix 2200kg of qualified powder, 1100kg of primary fine powdered phosphogypsum and 6700kg of red mud into a homogeneous material with moisture by rolling; the mixed material with moisture is made in...

Embodiment 2

[0046] Raw materials: sintered red mud (vacuum dehydration, moisture content 36.9 wt%), primary fine powdered phosphogypsum, coal gangue (average low calorific value 919kcal / kg) and calibration materials anthracite and barium slag.

[0047] 6300kg of red mud, 1500kg of phosphogypsum, 1500kg of coal gangue, 700kg of correction material (including 250kg of anthracite, 450kg of barium slag) are prepared according to a two-stage batching process to obtain homogeneous moisture-containing materials: one-stage batching process: 1500kg of coal gangue (grain) Diameter≤40mm), 450kg barium slag (particle size <30mm) and 250kg anthracite (particle size <30mm) ingredients, through Raymond milling to produce 2200kg of qualified powder with 80μm sieve residue <18%; secondary batching process: 2200kg of qualified powder, 1500kg of primary fine powdery phosphogypsum and 6300kg of red mud ingredients are mixed into homogeneous moisture-containing materials by rolling; the mixed moisture-containing ...

Embodiment 3

[0052] Raw materials: use Bayer process red mud (naturally drained, moisture content 36.9 wt%), primary fine powdered phosphogypsum, coal gangue (average low calorific value 1056kcal / kg) and correction material dry acetylene carbide slag (moisture Content 3 wt%) and barium slag.

[0053] 40,000 kg of red mud, 18,000 kg of phosphogypsum, 10,000 kg of coal gangue, 32,000 kg of correction materials (of which, 27,000 kg of calcium carbide slag, 5000 kg of barium slag) are prepared according to a two-stage energy-saving process to prepare homogeneous wet materials: one-level batching process: 10,000 kg of coal gangue (Particle size <40mm) and 5000kg barium slag (particle size <30mm) ingredients, after the ball mill is ground into 80μm sieve residue <16% qualified powder 15000kg; second-level batching process: 15000kg qualified powder, 18000kg raw fine Powdered phosphogypsum, 27000kg of dry powder calcium carbide slag and 40000kg of red mud ingredients are mixed into a homogeneous mois...

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Abstract

A method for comprehensive utilization of red mud, phosphogypsum and coal gangue comprises the following steps: red mud, phosphogypsum and coal gangue are used as main original burning materials, a correction material is taken as a secondary original burning material, a homogeneous moisture material is prepared through two-stage batching process and is shaped or dried and crushed, and then a clinker product including main ingredients of dicalcium silicate, calcium sulphoaluminate and calcium sulphoferrite is prepared through calcination. The clinker produced by the method can be not only directly sold as a product but also further processed into a cementing material or product for sale by utilizing the prior art. The method provided by the invention is simple in process and low in investment, the production scale can be either big or small, a rapid hardening early strength clinker produced by the method is wide in use and relatively higher in value, not only are lots of clay resources and non-renewable burning coal saved, but also environmental pollution caused by waste pollutants are effectively reduced, secondary disasters is prevented, and high industrial competitiveness and favorable investment economical efficiency are realized.

Description

technical field [0001] The invention relates to the comprehensive utilization of industrial waste, in particular to a method for comprehensively utilizing red mud, phosphogypsum and coal gangue to produce cementitious materials and products. Background technique [0002] Red mud is a very fine-grained strong alkaline solid waste produced during the process of extracting alumina from bauxite. For every ton of alumina produced, about 0.8 to 2 tons of red mud are produced. The red mud produced according to different extraction processes is called Bayer red mud, sintering red mud and combined red mud. Physical properties of red mud: particle diameter 0.088-0.25mm, specific gravity 2.7-2.9, bulk density 0.8-1, melting point 1200-1250°C. The mineral composition of red mud is complex, the main minerals are aragonite and calcite, the content is 60-65%, followed by opal, gibbsite, goethite, and the smaller content is titanium ore, siderite, trona, water glass , sodium aluminate and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/24
CPCY02P40/10
Inventor 尹小林
Owner 长沙紫宸科技开发有限公司
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