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CN-121974580-A - Cementing material based on low-sulfur cyanidation tailings and multiple solid wastes, and preparation method and application thereof

CN121974580ACN 121974580 ACN121974580 ACN 121974580ACN-121974580-A

Abstract

The invention relates to the technical field of industrial solid waste recycling and environmental protection treatment, and discloses a cementing material based on low-sulfur cyanidation tailings and multiple solid wastes, and a preparation method and application thereof. The invention uses low-sulfur cyanidation tailings as main raw materials, matches red mud, fly ash and steel slag, and enables Fe, S, siO 2 and other components in the tailings to react with active components in the multi-sulfur solid wastes to generate high-activity sulfur aluminate cement clinker through optimizing the proportioning and roasting process, so as to synchronously decompose cyanide to realize innocuity, and then further improve the gelation performance through gypsum excitation, finally prepare the cementing material with compressive strength meeting the 42.5-level sulfur aluminate cement standard, meet the mine filling requirement, and realize waste treatment and resource circulation.

Inventors

  • CAI MINGMING
  • GAO TENGYUE
  • LI GUANGSHENG
  • YANG XINHUA
  • ZHU XINGFU
  • XU CHAO
  • QIN GUANGLIN
  • ZHANG JUNTONG
  • WANG KAIMEI

Assignees

  • 山东黄金矿业科技有限公司选冶实验室分公司

Dates

Publication Date
20260505
Application Date
20251226

Claims (10)

  1. 1. A cementing material based on low-sulfur cyanidation tailings and multiple solid wastes is characterized by being prepared by mixing and grinding sulfoaluminate cement clinker and gypsum, wherein, The sulphoaluminate cement clinker is prepared by high-temperature oxidation and baking of mixed raw materials, wherein the mixed raw materials consist of low-sulphur cyanidation tailings, red mud, fly ash and steel slag according to the mass ratio of (9-11): (4-6): (2-4): (1-3); the addition amount of the gypsum is 30% +/-1% of the mass of the cement clinker.
  2. 2. The cementing material according to claim 1, wherein the water content of the low-sulfur cyanidation tailings is less than or equal to 1%, the particle size is less than or equal to 58 microns, the water content of the red mud is less than or equal to 2%, the water content of the fly ash is less than or equal to 2%, the steel slag is subjected to magnetic separation and deironing and then is ground to a specific surface area of more than or equal to 400m 2 /kg, and the particle size of the cementing material is less than or equal to 45 microns.
  3. 3. The cement according to claim 1, wherein the alkalinity coefficient is controlled to be 0.9 to 1.1 in the mixed raw material.
  4. 4. The cementing material according to any one of claims 1 to 3, wherein the cementing material is prepared into a sample according to a water cement ratio of 0.5, the 28d compressive strength of the cementing material sample is not lower than 42.5MPa after curing in water at 20+/-1 ℃, no crack exists on the surface of the cementing material sample, and the total cyanide in the cement clinker is not detected.
  5. 5. A method for preparing the cementing material according to any one of claims 1 to 4, comprising the following steps: Mixing ingredients, namely taking low-sulfur cyanidation tailings, red mud, fly ash and steel slag according to the mass ratio of (9-11), 4-6, 2-4 and 1-3, and uniformly mixing to obtain a mixed raw material; Press molding, namely press molding the mixed raw material to obtain a raw material block; roasting the raw material block in an oxidizing atmosphere to obtain sulphoaluminate cement clinker; Excitation grinding, namely adding 30% +/-1% of gypsum by mass into the sulphoaluminate cement clinker, and grinding together to obtain the filling cementing material.
  6. 6. The preparation method of the iron-free slag powder, according to claim 5, is characterized by further comprising the steps of raw material pretreatment, drying the low-sulfur cyanidation tailings until the water content is less than or equal to 1%, crushing the low-sulfur cyanidation tailings until the particle size is less than or equal to 58 microns, drying the red mud and the fly ash until the water content is less than or equal to 2%, and grinding the iron-free slag powder until the specific surface area is more than or equal to 400m 2 /kg.
  7. 7. The method according to claim 5, wherein the pressure of the press molding is 15mpa to 20mpa.
  8. 8. The method of claim 5, wherein the high temperature firing comprises: and heating the green brick to 1280-1320 ℃ at a heating rate of 8-12 ℃ per minute under an air atmosphere, preserving heat for 40-60 min, and cooling after roasting to obtain the sulphoaluminate cement clinker.
  9. 9. The method according to claim 5, wherein the excitation grinding is performed so as to have a particle size of 45 μm or less.
  10. 10. Use of the cement according to any one of claims 1 to 4 in mine filling operations.

Description

Cementing material based on low-sulfur cyanidation tailings and multiple solid wastes, and preparation method and application thereof Technical Field The invention relates to the technical field of industrial solid waste recycling and environmental protection treatment, in particular to a cementing material based on low-sulfur cyanidation tailings and multiple solid wastes, and a preparation method and application thereof. Background Cyanide tailings in the gold industry are incorporated into the national hazardous waste list (HW 33) because they contain highly toxic cyanide, heavy metals and residual flotation agents. At present, the low-sulfur cyanidation tailings are mainly piled up by a tailings pond, so that a large amount of land resources are occupied, soil, water and atmosphere are easy to pollute in a leakage and dust raising mode, and potential safety hazards such as collapse of the tailings pond are avoided. The existing low-sulfur cyanidation tailings treatment technology is mainly divided into two types, namely harmless treatment technology (such as an acidification recovery method and a filter pressing washing method) and recycling technology, wherein the harmless treatment technology has the problems of complex technology, high energy consumption, incomplete cyanide decomposition, easiness in secondary pollution and the like, and the recycling technology is mainly concentrated on single element recovery (such as gold, silver and iron) and has the defects of low recovery rate of valuable elements and insufficient overall utilization rate of tailings. In the aspect of cementing material preparation, the prior art uses cyanidation tailings to replace part of cement raw materials, and because the cementing activity of the tailings is low, the tailings are required to depend on high-proportion cement clinker or a large amount of chemical exciting agent, so that the product strength is insufficient, the cost is high, and the industrial application is difficult to realize. Disclosure of Invention Aiming at the problems of low-sulfur cyanidation tailings stockpiling pollution and low efficiency and high consumption of the prior treatment technology, the invention provides a cementing material based on low-sulfur cyanidation tailings synergistic multi-element solid waste, and a preparation method and application thereof. The components such as Fe, S, siO 2 in the tailings react with active ingredients in the multiple solid wastes to generate high-activity sulphoaluminate cement clinker through the synergistic utilization of the multiple solid wastes, the low-sulphur cyanidation tailings are used as main raw materials, the red mud, the fly ash and the steel slag are matched, the ingredients such as Fe, S, siO 2 and the like in the tailings react with the active ingredients in the multiple solid wastes to generate the high-activity sulphoaluminate cement clinker, cyanide is synchronously decomposed to realize innocuity, and then the cementing performance is further improved through gypsum excitation, so that the cementing material meeting the mine filling requirements is finally prepared, and the purposes of waste treatment by waste and resource circulation are realized. The invention provides a cementing material based on low-sulfur cyanidation tailings and multiple solid wastes, which is formed by mixing and grinding sulfoaluminate cement clinker and gypsum, wherein, The sulphoaluminate cement clinker is prepared by high-temperature oxidation and baking of mixed raw materials, wherein the mixed raw materials consist of low-sulphur cyanidation tailings, red mud, fly ash and steel slag according to the mass ratio of (9-11): (4-6): (2-4): (1-3); the addition amount of the gypsum is 30% +/-1% of the mass of the cement clinker. Further, the water content of the low-sulfur cyanidation tailings is less than or equal to 1%, the grain size is less than or equal to 58 mu m, the water content of the red mud is less than or equal to 2%, the water content of the fly ash is less than or equal to 2%, the steel slag is subjected to magnetic separation and deironing and then is ground to a specific surface area of more than or equal to 400m 2/kg, and the grain size of the cementing material is less than or equal to 45 mu m. Further, in the mixed raw material, the alkalinity coefficient is controlled to be 0.9-1.1. Further, the cementing material is prepared into a sample according to a water cement ratio of 0.5, after curing in water at 20+/-1 ℃, the 28d compressive strength of the cementing material sample is not lower than 42.5MPa, no crack exists on the surface of the cementing material sample, and the total cyanide in the cement clinker is not detected. In a second aspect of the present invention, there is provided a method for preparing the above-mentioned cement, comprising the steps of: Mixing ingredients, namely taking low-sulfur cyanidation tailings, red mud, fly ash and steel slag according to the mass ratio